You ask me to answer the Q group question
Delamination of cooking bags
Xiaoyue Chen, Hunan: PET / AL / NY / RCPP four-layer aluminum foil cooking bag, using the same glue, what happened to the PET layer delamination? PET is not printed, and the sizing amount is no problem. The cooking temperature is 121 ° C and the cooking time is 30min.
Guangdong Guowang Du Qingli: Does the glue meet the cooking requirements? Is the main rubber and curing agent ratio standard? Did you add more? Hunan Yueyang Xiaochen: All are normal.
Jinan Yongfa Xiaoke: How much PET Dyne?
Guangdong Guowang Du Qingli: Did you do it in the same way before? Or does this happen occasionally?
Xiaoyue Chen, Hunan: The craftsmanship hasn't changed, but something went wrong this time.
Guowang Cui Zheng: Has the PET raw material changed?
Xiaoyue Chen, Hunan: PET has not changed. All materials are purchased in the same house. People, things and the environment need not be considered.
Du Qingli, Guangdong Guowang: Is your place relatively humid recently and the rain is heavy?
Xiaoyue Chen, Hunan: It happened under normal circumstances.
Hangzhou Xinguang Hu Jinhui: There is a problem with AL.
Guangdong Guowang Du Qingli: Is this all the order? Have you changed the aluminum foil?
Xiaoyue Chen, Hunan: Initially we also thought that it was a problem of pure aluminum, but after testing, it was not a problem of pure aluminum, and all materials were not replaced by the manufacturer.
Hangzhou Xinguang Hu Jinhui: How do you arrange the ripening time? What is the change in peel strength before cooking without cooking?
Xiaoyue Chen, Hunan: No change. And I heard the quality inspection department said that the water will be delaminated with the rice cooker, but only the first layer is removed, and the second layer is not removed.
Guangdong Guowang Du Qingli: The raw materials have not been changed, but have the batches been changed?
Chen of Yueyang, Hunan: In the same situation, a four-layer structure is made. All conditions and glue are the same. One layer will be removed, and the other layers will not be removed.
Xiang-Jingxin-Xiao Zhang: Is PET auxiliaries precipitated or corona is not up to standard? Glue anti-additives have different capabilities and will present different results.
Zou Yuzhi, a soft bag in Hunan: The outer PET layer is easily eroded by water, so it is delaminated. Personally, I believe that the initial difference is definitely the quality of the glue. As for the inner layer, it is because the inner layer has no problem in the quality of plastic composite strength and forms a relatively strong barrier layer. Therefore, the inner layer of aluminum foil is not eroded, so the inner layer is not delaminated. Aluminum foil composite delamination is generally caused by water erosion. Once there was a customer who used ordinary water-cooking glue to make aluminum-plastic composites. When the problem occurred, the edge was delaminated. I tried to apply a circle on the edge with glue, and I didn't take it off again.
Xiang-Jingxin-Xiao Zhang: PET will add amine antioxidants during the production process, such as the precipitation of additives, will consume a part of the curing agent of the glue, if the two glues have different capabilities, the resulting composite peel The strength will also be different, showing two results, those with strong resistance to additives, good peel strength, weak resistance to additives, and poor peel strength.
Guangdong Guowang Du Qingli: Why there is no problem with the inner layer of PA and aluminum foil, it is because the glue layer of the inner layer is protected by the aluminum foil layer. The problem of precipitation of additives. If PET is used too much, the small molecules that it degrades can catalyze the degradation of the glue, and the glue performance will deteriorate.
Zou Yuzhi, a soft bag in Hunan: I mean the same, I doubt the performance of the glue composite aluminum foil, and the inner layer is protected by a barrier.
Xiang-Jingxin-Xiao Zhang: It is recommended to replace the glue, or use the glue for testing, and add a little more curing agent.
Guangdong Guowang Du Qingli: Adding more curing agents will also help.
Xiaoyue Chen, Hunan: Thank you all!
Second, the bottom seal of the self-supporting nozzle bag leaked
Italy Esti: What is the reason for the leakage of the bottom seal of the self-supporting nozzle bag made of PET12 / NY15 / PE75 for breakfast milk? At the bottom of the bag, just inside the bottom seal and the side seal.
SECURE PACKAGING pay: The performance of PE (tensile strength, elongation, impact strength of pendulum) has a great impact, followed by the organic combination of the size of the bag seal and the side seal, and the hardness of the glue, etc. factor.
Yin Ting packaging Yu Dingzhao: Did you cut the board you inserted?
Yi Esti: It was n’t cut by a flapper. After the bag was hot, it leaked at the intersection. Just at the intersection.
Shanghai Trading-Pan: Adding low-density metallocene to the inner layer of PE improves the elongation of the heat seal layer, and can also reduce the heat seal temperature and avoid false seal.
Xiaoshan Chaoyang Color Printing: Is there a good handover at the intersection? The three points should overlap.
Italy Esti: Four abrasive tools, four times hot, and some three times.
Cheng's Plastic Packaging: No reason whatsoever. Are you sure your abrasive is OK?
Xiaoshan Chaoyang Color Printing: Soymilk bags are usually broken in that position. Is there a coincidence between the self-supporting knife and the electric knife transfer?
Cheng's Plastic Industry Packaging: There are two reasons for the leakage, one is not sealed, and the other is the pressure to tear the inside angle.
Jiangmen Hualong Chen Gen: It is also possible that the heat sealing layer of PE was damaged due to excessive pressure. This bag does not add up too much. If the temperature is too high or the pressure is too high, it will damage the PE heat-seal layer and cause liquid leakage. Will help.
Xiaoshan Chaoyang Color Printing: What's wrong with opp18 / pvc130 where there is ink? It is a kind of film, which is placed in a quilt bag. It is a home textile. Easy to peel off. The ink is peeled off where there is ink, and the ink is not peeled off where it is not. It is printed on OPP.
Ningming, Jiangsu: This is a problem with ink. Is it an OPP ink?
Xiaoshan Chaoyang Color Printing: The same ink used in the previous batch is not so serious, and it will not delaminate in a single fold. Bauhinia GPC and Letong GP37 were used.
Ningming, Jiangsu: Under the OPP special ink test, consult the ink manufacturer, this phenomenon is very common.
Xiaoshan Chaoyang Color Printing: Now changing ink for proofing.
Soft package service Jia Junliang: It is estimated to be on the PVC side.
Xiaoshan Chaoyang Color Printing: White ink is transferred to PVC, but color ink is not.
Guangdong Compound Jiang: If it is on the PVC side, it should be the problem of ink.
Soft bag service Jia Junliang: Most of this structure will allow the ink to migrate to the other side. Excessive thickness of PVC is the main problem. The ink as a carrier cannot withstand such a large internal force, so the peel strength of the ink is low. It is recommended to use thinner PVC.
Fourth, the black words are not clear
Heliansheng Packaging Materials : When printing BOPP light film with gravure composite ink, some characters on the light screen will be unclear when printing in black.
Printing and composite printing: This is caused by dry plate, black ink with some slow-drying solvent. Or add a new ink, if the solvent is added, if it is an ester-soluble ink, add isopropyl alcohol. At the same time, do not print too fast.
Heliansheng Packaging Materials: Is it a problem with the ink itself?
Printing compound: It should not be a problem with ink.
Ink Engineering-Deng: Your question is either dry plate or poor ink fluidity. How fast is your machine?
Heliansheng packaging material: 100m / min.
Ink Engineering-Deng: The possibility of a dry plate is relatively large, add a little butyl ester.
Printing compound in branch: Butyl fat is best not to add, add isopropyl alcohol.
Heliansheng Packaging Materials: At present we are adding toluene, ethyl ester and methyl ethyl ketone.
Ink Engineering-Deng: The most direct thing is that the submarine net transfer is not good, and the blocked and dirty version.
Heliansheng packaging material: When we printed, there was a small character in a small screen, and it was a light screen. When printing, the characters on the back were blurred, and they were all in the same place.
Ink Engineering-Deng: Is it a new edition?
Heliansheng Packaging Materials: Yes.
Ink Engineering-Deng: If the dots in this part are carved too lightly, this phenomenon may also be caused.
Heliansheng packaging material: The engraving is very uniform.
Ink Engineering-Deng: There are more general problems in the new version, and there are no similar problems after a long time.
Heliansheng packaging materials: In other words, there are three possibilities: the plate is carved too shallow, the ink fluidity is not good enough, and the plate is dry, right?
Ink Engineering-Deng: Right.
Printing Huangchuan: It is also possible that the solvent is not properly prepared and the blade angle is not adjusted well. Can be eliminated from these aspects one by one to find a solution.
V. Water glue blocking network
Xia He Rubber Industry Wang: What is the problem with water glue blocking the net? Used on PET, that is, no glue, no glue, coated flowers.
Guangdong Compound Jiang: How many net rolls do you use?
Hengbang Printing Xiao Zhang: How deep is the screen roller?
Xia He Jiao Wang: One hundred and fifty lines.
Guangdong Compound Jiang: Have you been down for a long time?
Xiahe Rubber Industry Wang: There is no downtime, and the machine is always turning.
Guangdong Composite Jiang: What is the machine speed during idling?
Xiahe Rubber Industry Wang: The slowest speed. Now the network is always blocked, and the machine will be wiped soon. Washing a roll is troublesome.
Guangdong Compound Jiang: Is the temperature in your workshop too high?
Wuxi packaging: just add more diluent, you can add tap water, but you need to filter.
Liaoning Packaging-Chen: When the machine speed is slow, you can add a little pure water, that is, 5% ~ 10% of the vat to drink. If you add more, it is easy to become weak, and some will foam.
Xia He Rubber Industry Wang: Will it not stick if you add water?
Liaoning Packaging-Chen: 5% water, generally does not affect. He is a water-based paper-plastic composite, with a larger amount of glue than plastic. What is the solid content of the water glue you use?
Xiahe Rubber Industry Wang: 55%.
Liaoning Packaging-Chen: Generally the solid content is not less than 45%. The viscosity of the glue solution does not change much, as long as the brightness of the composite product does not change, the adhesive force does not change much.
Six, water glue
Shangyi Caiyi: Does anyone use water glue? Why is it astringent? It will stick when making the bag and it won't open easily.
Li Gong: It is based on the experience of solvent-based adhesives. This is because the water has not evaporated.
Liaoning Packaging-Chen: Is it a PE film?
Shangyi Caiyi: We are a compound KNY + PE. Our company counts as one of the first companies in Taiwan to use water glue. I think someone on the mainland should use it.
Li Gong: Cai Yi, are you using water-based glue produced by Taiwan technology?
Shangyi Caiyi: Bought with a company called Wangyou.
Liaoning Packaging-Chen: The water glue you use may have too many additives. For PE film, it is easy to slip.
Shangyi Caiyi: The general glue will not be astringent. If you change the glue, the bag will not open.
Drug-packed beam: Water-based glue does have a sticky feel, not particularly stable.
Li Gong: If the water glue is an acrylic system, heat sealing is easy to cause problems; the leveling of the polyurethane system is easy to cause problems. However, this problem of acrylic acid is determined by materials and cannot be solved. The last thing that can replace solvent-based adhesives is water-based polyurethane adhesives.
Seven, soy milk bags
Chongqing Flexible Packaging : Do automatic milk bottles need to be sterilized before filling? Fill at 85 ° C.
SECURE PACKAGING pay: You don't need to consider sterilization before filling, you can use pasteurization after filling.
Chongqing Flexible Packaging: Soymilk bags are self-supporting spout bags. The bags will have some influence after pasteurization. For heat-sealing strength, the possibility of leaking bags is greater. This product has high technical requirements. Is there any other sterilization method? The material is BOPA / PE. This material is not a big problem for boiling, but I'm a little afraid that the mouth will leak bags after boiling, because this product is mainly targeted at the government and students, so I'm afraid of problems. Shouldn't vacuum be used for hot filling?
SECURE PACKAGING pay: no need to vacuum, the material used PET (printing) / PA / PE should not cause problems.
Chongqing Flexible Packaging: Some materials are made of PET / PE. We use BOPA in order to ensure quality. The cost of this material you said may be a bit higher. The most leaky part of this bag is the self-supporting bottom and the heat-sealing mouth. If it is not properly controlled, it will cause problems.
SECURE PACKAGING: Yes.
Chongqing Flexible Packaging: Is it feasible to sterilize with infrared, ozone and disinfection water?
SECURE PACKAGING payment: should not work.
Chongqing Flexible Packaging: They said that the residue of disinfection water will evaporate, but I think it will be difficult to evaporate completely and the efficiency will be very low.
Gold List Packaging: This method is rarely used in the industry.
Chongqing Flexible Packaging: It is used by food manufacturers, but I don't think it is feasible! Because they are facing the government and students, they are more careful. If it is normal, I think that the bag can be directly filled, because the temperature of the soy milk is 85 ° C, in fact, there should be few bacteria.
Jinbang Packaging: Pay attention to the problem when designing the bag, especially this kind of liquid. The bottom is made of a three-layer structure, and a little pressure is added at the bottom, which is generally no problem.
Damage rate of boiled bags
Panjin Meijia Plastic Color: Is there a national standard for the damage rate of boiled bags?
Wu Xianchao: The damage rate of cooking bags and liquid standing bags is generally not more than three-thousandths. The industry standard of boiled bags has not been heard.
Panjin Meijia Plastic Color: What about vacuum?
Wu Xianchao: Each customer's requirements are different, this depends on the customer's requirements.
Baoying helped: if one-thousandth of the customers of the export have to complain, the five-thousandth of the domestic sales should be negotiable.
Nine, printing trail
A soft bag: the color of the printed product's major spot, always on the small end, the viscosity is high and low, the chopsticks are crossed, and there will be a while, is the reason for the slow speed, thick ink particles, or other reasons? Pearly opp, surface printing ink.
Shenzhen-plastic bags: try filtering the ink.
Yu Tingzhao, Yinteng Packaging: The ink has impurities, try filtering it.
Shangyang Packaging-Qi: Try adding a little water to the ink.
Yin Teng packaging Yu Dingzhao: This method of adding water is rarely used, but all people who use this method are masters. I heard that up to 1.5KG of water is added to the 20KG ink. I have not verified it. Have you tried it?
Shangyang Packaging-Qi: PET, OPP inks are printed with ordinary inks, and a little water is added in the production, which can often be solved. But you can't add more, not more. I saw it in Zhongshan Tiancai, but the effect is really good, you can give it a try.
A soft bag: Can the surface print be filled with water?
Yin Dingzhao Yu Dingzhao: I just asked the mechanic that the effect of adding water to the ink is to eliminate the static electricity of the ink and increase the slippage of the plate and the scraper.
Guangzhou Yiying Color Printing: See if there is regularity, if it is regular, it may be a knife; if there is no regularity, it is static electricity. Does it appear according to the line of the knife swing? First look at the regularity, then consider ink and other reasons. The knife is oscillating. The back and forth distance is the same. If it is a version, it is fixed. If there is no regular dragging, you can add antistatic liquid to the ink to prevent smearing.
Yantai Flexible Packaging-Wu: It should be caused by ink particles that are too large. You can see if the scraper has a plug phenomenon. Static electricity can cause burrs, not wire. What is the humidity in the workshop?
Zhuhai Ruilong Ink: It should be caused by insufficient ink fineness.
Wu Xianchao: This kind of problem is generally a problem with printing plate and ink. Ink: Control the proportion of used ink, filter the ink; control the dust of the environment. Printing plate: During copper plating, the platemaking factory is required to grind it once; if there is a problem during use, polish the printing plate.
Sichuan Tianyi-Li: Polish the rollers, and take a closer look at the scraper angle.
Yantai Flexible Packaging-Wu: Polish the plate roller first.
Wu Xianchao: Before chrome plating, the plate roller is polished for the best effect.
Beijing Guoruihe Packaging: When compounding low-temperature CPP products, what is the appropriate curing temperature and time? At the moment of making the bag, the material can't move, and our product becomes astringent after curing.
Zou Wenhua, Zhejiang: The curing temperature is 45 ° C, and the time is 24 hours. Your problem should be related to the compound winding.
Norwich Solventless Solvent: The low-temperature heat-sealed cpp curing temperature is lower.
Chaoan color printing: the compound temperature is 40 ℃, and the curing temperature is 45 ℃, and the curing time is determined by the glue characteristics and the solvent residue.
Norvek Solventless Sun: It seems to be more difficult to get astringent, or consider replacing the raw materials in cpp to reduce the heat sealing temperature.
Yuema-Huang Siyao: It is best to ripen at room temperature.
Chaoan color printing: If the transparency is not high, you can use a slitter to rewind and dust.
Norvek Solvent-free Sun: Spraying powder is afraid of poor heat sealing effect.
Zou Wenhua, Zhejiang: What to pretend. If it's not food, you can spray some powder.
Jiangsu Zhongma-Li: Rewinding and leaving it for a while can improve it.
Beijing Guoruihe Packaging: How long does it take to be bagged after curing?
Chaoan Color Printing: Bags can be made only after cooling down. If it is urgent, it can be blown with cold air.
Jiangsu Zhongma-Li: After the normal products are matured, bags can be made within 24 hours after storage.
Zou Yuzhi, a soft pack in Hunan: You can also consider using cold air for one day in an air-conditioned room. The additives will precipitate out, which should be fine.
Aguo-Yili Phnom Penh Plastic Industry: What is the reason for the curling of the packaging bag after high temperature cooking? The structure is PA / CPP. The cooking temperature is 125 ° C. The materials and glue used are all cooked.
Guangzhou Shengda Color Printing: There is a problem with the compound, and the curing temperature is too high.
Beijing-Tianjin-Hebei Glue-Lu: Does it look like the film shrinks? Unsynchronized shrinkage causes curling. How much do you apply?
Aguo-Yili Phnom Penh Plastic Industry: Is it related to the film used?
Qunying Packaging-Hong: Yes, bi-directional stretching will not.
Aguo-Yili Phnom Penh Plastic Industry: I use biaxially oriented PA.
Shanghai Yexin: The tensile force of the substrates that are bonded to each other is not consistent, and the film is curled toward the substrate with a large force. The speed and tension of the rollers should be adjusted.
Qunying Packaging-Hong: This situation also occurs if the compound tension is not adjusted.
Hangzhou Xinguang Hu Jinhui: This situation will also occur when the maturation time is not enough.
Guangdong Mingwang Lu Minghua: This situation is generally caused by the difference between the thermal shrinkage of the outer layer NY and the inner CPP. Because the curling of the film changes after compounding, curing, cooking, and cooling, we Need to push from the back to adjust the tension of NY and CPP.
Aguo-Yili Phnom Penh Plastic Industry: When the bag was made, it was flat, and it was rolled after cooking.
Guangdong Mingwang Lu Minghua: In this case, the bag should be rolled in. Or you replace one of the raw materials and do a heat shrink test of the raw materials before use.
Hangzhou Xinguang Hu Jinhui: A country, is it like this for every batch? Is it the first time? Is it the whole batch or part of it?
A country-Yili Phnom Penh plastic industry: the whole batch, the first time. I have made "Humour Eggs", they are all the same with PA, 37 yuan / KG, they wo n’t roll, but CPP is different. When making "Humbild Eggs and Chicken Wings", the bag is small and only a little rolled.
Hangzhou Xinguang Hu Jinhui: Replace the film with a synchronous one. At the same time, the tension of your compound machine should not be well controlled.
President Yin Teng Yu: If it is a compound tension problem, it will roll when making bags; if there is a problem with PA, there should be a problem of warping. So the cause of this problem is most likely caused by the different heat shrinkage ratios of the two films, but other reasons are not ruled out. It is best to analyze them one by one. It is not the people, the equipment, the equipment or the materials, and the environment is excluded.
Twelve easy tear lines
Raw material procurement: Does anyone know the material of Nescafe coffee packaging? Why is there no tear, but it is so easy to tear, is it easy to tear film or cellophane?
Guangzhou Dafa Packaging Products Co., Ltd .: Easy to tear film.
Shanghai Yexin: Easy to tear horizontally.
Gold list packaging: you can hit easy tear line.
SECURE PACKAGING pay: laser hitting easy tear line.
Jinbang Packaging: The easy tear line is that the film has no tear, and the surface is penetrated with a layer of laser.
Raw material purchase: But it is composed of several layers.
Gold List Packaging: Adjust laser intensity to play only one or two layers. Like Lipton's are easy to tear.
Nanping Color Printing-Yang Yang: Breakthrough, is it airtight?
Jinbang packaging: does not affect the ventilation and oxygen permeability. Only the surface layer, but not the barrier layer.
Nanjing Packaging Liu Xiaoyong: Is it so easy to tear?
Gold list packaging: easy to tear, tear line is also flat.
Nanjing Packaging Liu Xiaoyong: I have a product that is now a high-density PE bag with poor tear properties. The bag is quite straight, 8 silk.
Jinbang Packaging: Customers demand easy tearing?
Nanjing Packaging Liu Xiaoyong: It's easy to tear, but still quite strong.
Jinbang Packaging: It should be possible to hit this line without affecting product performance.
Nanjing Packaging Liu Xiaoyong: But I heard that the cost of hitting the easy tear line will be higher.
Gold List Packaging: It may be that the initial investment is a bit large, if there are multiple models of this product, it can still be used. About one hundred thousand equipment. Before we made an H-shaped bag, it was easy to tear.
Thirteen, rise or break
A soft bag: PET light film / aluminum foil / anti-acid PT, thickness 10 wire, cooking ink, cooking aluminum foil glue. After boiling at 100 ° C, the sealing and welding knives on both sides are exploded. Is there any way to solve it?
Shanghai Soft Bag: You need to know what the essence of the package is, in fact, it has nothing to do with the packaging material. It is usually very easy to mix the expansion package with poor heat seal strength. The rising bag is blunt because the air inside is not exhausted, and it expands and breaks through the hot edge during cooking at high temperature.
Continuation of the Third Army: One of the reasons for increasing the package is that the vacuum is not pumped well, and the second is that the sterilization is not thorough.
A soft bag: The bag is expanded when it is cooked. Is there too much material and water in the bag and there is not enough space?
Wuhan Huantai Packaging-F: Pack a small half bag of rice, cook after vacuuming, and then observe.
Continuation of the Third Army: When cooking, the bag is raised, but the vacuum is not evacuated and air is left. The air in the bag is heated during cooking, the volume is doubled, so the bag expands, resulting in rupture.
Wuhan Huantai Packaging-F: Yes, it should be that the vacuum is not good.
Hongxin Color Printing-Xiao Zhou: Do you add back pressure to boiled water?
Guangzhou Biaoji-Xiaoshi: Be sure to use a back pressure cooking pot for experiments, regardless of whether the pump is vacuumed.
Hongxin Color Printing-Xiao Zhou: Yes, if there is back pressure, the quality of the bag will be a problem if the bag is raised again. There is also pure aluminum, the water resistance of the glue is very important.
A soft bag: three layers are open at the same time.
Hongxin Color Printing-Xiao Zhou: The glue must be fully cooked. You can drain the water and air and cook it again.
Shanghai soft bag: Anything that may have water or air residue will cause the bag to rise.
Hongxin Color Printing-Xiao Zhou: The key is to distinguish whether the side exploded due to the bag increase or the problem caused by the bag, so that we can solve it. Caused by bag expansion, it is solved from the aspect of vacuum back pressure, and the bag problem is solved from the aspect of production process.
Jiangsu Zhongma-Li: When cooking, the steam is large, and it will burst from the inner layer, or break from the root. The first type is not good heat seal, and the second is heat sealed or heat sealed layer. The material is not good. Of course, there are factors in the test conditions.
Shanghai soft bag: This is also very different. You can compare the bag with the broken bag and the broken bag, and see the damage of the heat seal, and you will know by comparison. Hongxin Xiaozhou is right, many manufacturers will mix up bags with broken bags, and then have no direction to solve the problem.
Hongxin Color Printing-Xiao Zhou: Qualified cooking bags, due to the high temperature during high temperature cooking, the strength of the expanding bag will burst if it exceeds the limit of the material, so it must be distinguished whether the package is rising or broken.
Yin Teng packaging Yu Dingzhao: Yes, we must distinguish. According to the situation said, I feel like breaking the bag, not increasing the bag. So we must solve this problem from the direction of solving broken packets. Breaking the package is mainly to choose the appropriate processing temperature, pressure and heat-sealing time for the bag making. This requires the company to slowly adjust to the appropriate data according to its own production conditions and environment.
Rishan Red Printing Packaging : What is the problem with the separation layer on the edge of the seal?
Xiang-Jing-Xin-Xiao Zhang: Why is there only white places separated from the floor? What about the green below?
Sun Mountain Red Printing Packaging: Both.
Alcohol-soluble general-purpose inks: The delamination at the seal is caused by the ink being dry and incomplete, which is caused by the detachment of high-temperature solvents. It is best to leave it at room temperature for a period of time before making the bag. The more cured, the more obvious.
Sun Mountain Red Printing Packaging: But it has only one side separated from the layer. After the bag comes out, there are small cracks at the edge of the edge, which can be taken off with a nail. Generally, it is located at the point where the tear is easy. The structure is OPP / CPP aluminized PE.
Xiang-Jingxin-Xiao Zhang: Is VMPET in the middle?
Yin Dingzhao Yu Dingzhao: Did your glue dry? How about the temperature resistance of your glue and how much glue does it have?
Xiang-Jingxin-Xiao-Zhang: If the aluminized film is transferred, this phenomenon is normal.
Yu Tingzhao of Yinteng Packaging:
There is no transfer of aluminum plating.
Rishan red printing and packaging: sufficient curing time, anilox roll 120.
Xiang-Jingxin-Xiao Zhang: What is the peel strength of the composite film?
Sun Mountain Red Printing Packaging: The most obvious is this:
Xiang-Jingxin-Xiao Zhang: The aluminum coating has been transferred. It is caused by the problem of aluminum plating film transfer. The peeling force is not up to standard and should be below 0.5N / 15mm.
Guangzhou Dafa Packing Products Co., Ltd .: My OPP bright film, the corona pen spreads as soon as the water slides. Is it that OPP originally has such properties or is it not enough?
Sichuan Tianyi-Li: How much Dyne do you use?
Guangzhou Dafa Packing Products Co., Ltd .: 38 dyne.
Sichuan Tianyi-Li: Can't both sides?
Guangzhou Dafa Packing Products Co., Ltd .: Only this effect:
Sichuan Tianyi-Li: Is it spreading or shrinking?
Guangzhou Dafa Packing Products Co., Ltd .: Spread apart.
Sichuan Tianyi-Li: Spreading is normal.
Guangzhou Dafa Packaging Products Co., Ltd .: But it is too obvious.
Drug package beam: It should be a corona pen problem. The spread should be small beads, try with corona water.
Guangzhou Dafa Packing Products Co., Ltd .: Thank you. Wait for the test. Is it more than 50?
Drug-packed beams: No, generally corona will shrink directly if you do not have enough corona.
Guangzhou Dafa Packing Products Co., Ltd .: Thank you, I will test it, but is OPP shrinking 1.9c faster?
Drug-packed beams: Not obvious by comparison.
Guangzhou Dafa Packing Products Co., Ltd .: Got it, thank you!
A soft bag: OPP // aluminum foil // PE. When the aluminum foil bag is made, there is always a wave-like wrinkle on the edge of the sealing knife. How can this wrinkle be solved? It came out of the bag horizontally. There was always a wrinkle on the sealing edge of the sealing knife, but there was no inside of the sealing knife. I have n’t loaded anything yet, just made the bag. The material is pulled tightly, using tap water at room temperature once. But it also wrinkles in winter, thank you.
Printed in China: The temperature is high and the PE heat seal point is high. It is recommended to use low temperature materials.
Linyi Bangcheng Packaging: There are many reasons for this situation: the tension is a bit large, and the compound tension is large.
Yantai Flexible Packaging-Wu: Experiment with PET on the outer layer and it should change.
A soft bag: Is that easy to delaminate?
Yantai Flexible Packaging-Wu: No delamination. My family has been doing it. PET has good rigidity and is not easy to shrink.
A soft bag: Do you have to use PET inks and glue if you use PET?
Yantai Flexible Packaging-Wu: Yes.
Chengdu Yongchangtai: BOPP38 / CPP40 is self-checked after being compounded. The side seal of the bag is 15mm, and the head seal is 45mm. The bag has poor flatness, and the head seal is S-shaped. what is the reason?
Jinbang Packaging: Two main considerations: 1. Does your CPP have a higher unsealing temperature and requires a higher heat-sealing temperature? Excessive temperature will cause the bag to deform due to temperature. 2. Whether the cooling system of the bag making machine is bad, the cooling cannot meet the requirements, the bag cannot be cooled in time, and the bag is uneven and curled.
Norwich Solventless Sun: What toughening raw materials are added to CPP?
Chengdu Yongchangtai: CPP was added (1520).
Jinan Yongfa Xiaoke: The wide seal is also OPP / CPP structure. If it is flat, you can use a few hot irons to reduce the temperature of the hot iron and buy low-temperature CPP. If the main motor of the bag making machine is servo, this problem can be better solved.
Chengdu Yongchangtai: CPP is low temperature and does not exceed 114 ℃.
Jinan Yongfa Xiaoke: Then we can only solve the problem from the bag making machine.
Chengdu Yongchangtai: Cast, does the formula in CPP have anything to do with the flatness of the bag? We have reduced the temperature to a minimum and the pressure has been adjusted, but the cooling is not very good.
Wenzhou Jintian Group: The low temperature is generally 115 ~ 120 ℃, and ultra low temperature can be used.
Chengdu Yongchangtai: We use 113 ~ 117 ℃, we don't use more than that. What is your ultra-low temperature?
Wenzhou Jintian Group: 105 ~ 110 ℃.
Jinhang Packing Sheet: Under the tension adjustment, the unwinding tension and the pressure of the middle and front rubber rollers are adjusted. Is it a three-traction or two-traction bag making machine?
Chengdu Yongchangtai: It is the second traction.
Jinhang Packing Sheet: Is the rear dragging system automatic or manual?
Chengdu Yongchangtai: Automatic, the machine is (yousheng).
Jinhang Packing Sheet: What is the peel strength of the bag?
Chengdu Yongchangtai: No problem.
Jinhang Packaging Zhang: That may be the reason for operation. Increase the flow of cooling water and adjust the tension compensation pressure, that is, the bag comes out, do not pull too tight.
A soft bag: the low temperature performance is not enough, causing OPP to shrink. It is best to change the toughening material of OPP. Your bag making temperature is too high.
Chengdu Yongchangtai: What toughening raw materials are generally better?
A soft bag: Use low temperature metallocene.
Shang Yicaiyi: Ask the paste composite product near the paper tube, the finished product will show wrinkles, about 200M, when the lamination was originally used to receive the 3-inch paper tube, if you change the 6-inch paper tube, there will still be wrinkles, just comparison Less, the fit tension is relaxed, but the slitting and tension will run higher, resulting in tighter, will shrink the tube, how to overcome?
Soft package management sales Tang: Adjust taper and tension. Is there any problem with the tension system of your slitting equipment?
Shangyi Caiyi: No.
Cheng's Plastic Industry Packaging: It should be caused by the compound tension and the temperature of the curing chamber.
Shangyi Caiyi: Is there any way to overcome it?
Soft bag management sales Tang: If the composite product has wrinkles or tension, it will curl. The taper of the compound winding should be adjusted, the tension should be large when cutting the film, and then the tension should be reduced after flattening. The other is to control the taper. It would be much better to wind up with a 6-inch paper tube. Choosing a better quality paper tube, the pressure of the paper tube material is also an aspect.
Xiamen Jinyuan Liu Hui: The initial tension of the winding is too small, increase the tension, and tighten it inside and loose it.
Shuanghui high-resistance diaphragm: The bottom wrinkle is mainly at the time of recombination. Once formed, it is difficult to improve when slitting. Still have to improve when compounding.
Guangzhou Parker Liu Changwen: A composite wrinkle like this should be one of the common problems now. The main reason is that the setting of the compound winding tension is unreasonable. There is a relationship with the shrinkage of the PE film. From the perspective of tension, it is mainly necessary to use an adjustable multi-section taper tension to wind up. It should work well. At the beginning, the tension should be large. When the rewinding diameter is 150 ~ 200mm, the tension attenuation will begin. The specific attenuation can be arbitrarily adjusted and set according to different materials. It's best to set multiple paragraphs, don't run one slash to the end. To do this work, keep a careful record and adjust at any time. Finally, a suitable winding tension curve is found. After doing this time, save the winding tension curve, and then call the same material directly next time.
Shangyi Caiyi: Thank you.
Nineteen: printing code absorbs moisture
Xiongzhou Kangxining: We are a Sichuan enterprise. Nylon PE, boiled bags, bags are spray-coded to absorb moisture, and they stick together. If this happens in summer, how can I solve it? Thank you.
Dongguan Yingcai Packaging Horse: What is the process? In which process is the coding performed and the interval time?
Xiongzhou Kangxining: We make the bag and send it to the customer's warehouse. The printing code is the customer's own production date. The date that the customer uses is a few days before the bag leaves the factory. The longer the time, the better it is.
Yantai flexible packaging: material structure? Is the outer layer PET or PA? The coding is generally no problem. Only the coding machine can not print because of the type of ink. Our customers generally use Japanese for coding inks for frozen products.
Shuanghui high-resistance diaphragm: What is the production workshop of the food factory? If the ambient water vapor is high, there is no good way. It is best to have three layers of bags without problems. The starting cost is a little higher, you can try other PA films. The film surface has different slip properties. Some films are better. The warehouse environment is improved. The bag use and coding time should be arranged reasonably and used immediately for a few hours. Or the easiest way is to change the PA film. PA film is divided into compound level and printing level. The water absorption of the film is different, but the main problem is slip agent. PA film will absorb a little water, but if the film has good slip properties, it will not affect and will not stick.
Shangyang Packaging-Qi: PET / AL / PE requires antistatic. The powder contained in the contents is relatively fine. PE is from Beijing Yongsheng. But the antistatic effect is not good. Experimental PE effect is ok. Want to ask where the problem may be?
Fujian Kaida ° Funeral: PE.
Golden Harbor Packaging is good: PE.
Shangyang Packaging-Qi: Does it have anything to do with compounding?
Zhongnan Packaging Xiaoyong: Is PE an antistatic film?
Tianlong Packaging: It has a greater relationship with PE, but it also has a certain relationship with compounding. One of them has a greater relationship with the amount of glue. The adhesive must react with the slip agent in PE, and of course it also reacts with antistatic agents. When the slip agent reacts, the opening is not good; when the antistatic agent reacts, the antistatic effect is not good. Conversely, too much slip agent will affect the compound fastness. My previous approach was to use multi-layer co-extruded films, with less additives on the composite surface, and a little more additives on the middle layer, which can be used to store soy milk powder. This product requires good antistatic effect. Otherwise, the seal is sticky. Dirty, there is no way to seal, even using metallocene PE alone, the effect can not be completely resolved.
( Note: The above are some of the technical discussions in the group. If readers have different opinions, please continue to discuss, and also welcome to join our flexible packaging technology exchange QQ group (I group, II, total group is full, please add III group : 119411638 or IV group: 116162302)