Yongsheng Packaging-julia: What is the thickness of the two-layer composite film except film thickness, ink and glue?
Shanghai Yiguang Packaging Equipment: 1 wire, which is 10um.
Yongsheng Packaging-julia: Is the four-layer structure compounded three times and the ink glue added about 3um?
Guangzhou Tongze Machinery Dong: I think it is necessary to calculate separately. According to the coating amount of ink and glue, the thickness of 1g per square meter is increased by 1um.
Li Gong: If it is dry, the total thickness of ink and glue should be nearly 10um.
Jinan Xiaoke: How could it be so thick, at most 3um.
2. Frozen packaging structure containing duck paw
Central printing: I would like to ask the frozen food bag containing duck's paw, duck's paw is boneless, there is water inside, -4 ℃ storage, what kind of structure is suitable? OPP // PE or nylon // PE, or other structure? One side 40um.
Harbin Botai: It is nylon // PE! Frozen packaging PE is more suitable, CPP is too brittle at low temperature. How much is the content?
Guangzhou Bostik Song Kai: NY // RCPP is recommended.
Central printing: It is estimated that there is 200g, and the bag size is 22 * 18cm.
Harbin Botai: NY // PE is required for the grade; single-layer PE is required for the cost.
Central India: It makes sense, 40um on one side is a bit thin.
Harbin Botai: Quick-frozen split chickens are single-layer PE, 140um on both sides, and freeze-resistant ink for surface printing.
Central printing: how about using OPP // frozen PE?
Harbin Botai: No, you can try PET / PE, the cost is low, and the effect is ok.
Central printing: PET // PE will crack the seam at low temperature, because PET is also brittle.
Hubei Qianfu Xiaoxia: Your structure is not safe, PE is a bit thin.
Central printing: What kind of structure is not insurance? Customers should be thin in order to save costs.
Harbin Botai: At least 60um is better.
Hubei Qianfu Xiaoxia: If so, you can use 10um nylon directly.
Central Printing: Where can I buy 10um nylon?
Hubei Qianfu Xiaoxia: To get cheaper, you use 15um OPP.
Central Printing: What are the advantages and disadvantages of PET // PE?
Hubei Qianfu Xiaoxia: PET is also possible, but the density is higher. Which one is the cheapest one? This thickness is hard to say. It may be damaged.
A soft bag: Nordmec's solvent-free composite equipment, each roll of film will not dry for several meters, sometimes in the middle of the roll, sometimes at the edge of the roll, the width of the dry is about 4 ~ 5cm, what is the reason?
Yidebang glue Song Kai: half-time downtime is too long.
A soft bag: why?
Yi Debang Glue Song Kai: When the machine is stopped, the glue in the static mixer has been mixed together for a long time, and the reaction begins. When the viscosity increases to the second time, the previous glue is not evenly mixed. Will cause local dryness. This problem can be overcome by choosing a solvent-free glue with a long storage time.
A soft bag: But it is not that there is not much glue, but it is not dry. If there is glue but it is not dry, it is a roll.
Yidebang Glue Song Kai: The non-drying phenomenon is caused by the uneven mixing of the AB components, which is no NCO component.
Tongze Dong Wentao, Guangzhou: Is the temperature of the AB tank set the same?
A soft bag: not the same, B40 ℃, A30 ℃.
Tongze Dong Wentao, Guangzhou: At room temperature, is the viscosity of B glue high, or A glue high?
A soft bag: B glue. There are 7 rolls in total, some of them are not dry, and some of them are only dry.
Guangzhou Tongze Dong Wentao: That may be out of sync.
Yidebang Glue Song Kai: The core in the middle of the static mixer is reversed, and it will rotate with the glue.
Guangzhou Tongze Dong Wentao: Clean out the glue pipe.
A soft bag: I ca n’t put it in the reverse direction. Do you mean that the core of the mixer is turning?
Guangzhou Tongze Dong Wentao: Clean the A rubber pipe including the rubber mixing head.
A soft bag: OK.
Yidebang glue Song Kai: Yes.
Lanhai Printing: When printing BOPP heat-seal film with high-temperature ink, some ink still comes off on the hot knife of the packaging machine and sticks to the hot knife. What is the reason?
Harbin Botai: Does the hot knife have Teflon tape? It feels that the ink is not temperature resistant.
Jinan Xiaoke: It is not recommended to design patterns for general sealing positions.
Color printing, aluminum coating consultant: The ink used on OPP will not be high temperature resistant, and the temperature resistant ink will generally be hot roasted or two-component.
Dalian Jutong Plastic Xin: How do you control the wrinkles caused by lamination?
Dongguan Jinheng Packaging Fl: It can be controlled by adjusting the winding curve of the equipment.
Xiamen Jinyuan Liu: Adjust the rewinding tension.
Go your own way: the tension control of the winding is not good.
Chengdu Color Printing Management: Is it a composite roll bottom wrinkle or a surface wrinkle?
Hubei dry complex Xiaoxia: soft wrinkle.
Guangzhou Qianfu-Yang: Manual operation can be done when the material is received. Don't add more when it is adjusted. Minimize the number of downtimes.
Lida: It is indeed more difficult to control the automatic winding tension. Adjust the tension and winding curve according to the thickness of the film.
Jinyu Packaging King: There are roll bottom wrinkles, joint wrinkles and surface wrinkles. Roll bottom wrinkle is controlled by initial tension, tension decreasing curve setting, large paper tube, and paper tube rules and smoothness; joint wrinkle, pay attention to the flatness of the joint tape, rationality of tension switching (equipment performance); surface wrinkles are more It is related to the bottom wrinkle of the raw material, especially the thick film. Pay attention to the early material switching.
Looking up at the stars: Replace the die with a large one.
6.Coffee packaging structure
General Manager Taishan Hu: Does anyone know the material specifications of the automatic packaging roll film of Nestle coffee recently? It is an easy-to-tear material, and each part can be easily torn.
Packaging recruits: made of extrusion compound, PET / AC / LDPE-LDPE + AE / AL / EAA-MLLDPE, using twin screw co-extrusion.
Guangdong Composite Jiang: PET // PE // AL // PE // PE.
7, blank knife line
Yang Zibiao: I ask you, why do I always have blank cutting lines when recombining? The glue and the basin are clean.
Wuhan Printing-Yang: It's definitely not clean with a blank knife line.
Hubei Qianfu Xiaoxia: Check the knife edge, what glue is used?
Yang Zibiao: Li He.
Wuhan Printing-Yang: There will always be things that should not be related to the sword.
Hubei dry complex Xiaoxia: Have you used alcohol and water glue?
Yang Zibiao: The glue is not dirty, no, the scraper is also normal.
Hubei Qianfu Xiaoxia: It always appears to see if the blade is wiped clean.
Yang Zibiao: Clean it up.
Liu Liufang: It may be a rubber roller.
Hubei Qianfu Xiaoxia: Put the stocking tube up and down on stockings, and rub the knife edge with sandpaper.
Wuhan Printing-Yang: It must be caused by slag, try to filter the glue.
Yang Zibiao: manual glue. Why should the knife edge be sanded?
Hubei Qianfu Xiaoxia: Manually add glue and save the glue yourself! Cover it with a lid to reduce dust ingress.
Yang Zibiao: The glue is not dirty and clean.
Hubei Ganfu Xiaoxia: Why should the knife edge be sanded? Prevent the dry glue under the knife edge from being softened by the glue.
Jingbao—RH: Adjust the blade angle and filter the glue. Xiao Xia makes sense.
Wuhan Printing-Yang: Clean it before use, and use it after filtering through a 120 mesh filter.
Jiangxi Yunlong Color Printing: The glue must have particles, pay attention to the angle of the knife.
Hubei Qianfu Xiaoxia: The empty knife line is full of impurities!
Jiangxi Yunlong Color Printing: Net rollers must be wiped clean.
Yang Zibiao: The angles of the knives are basically parallel.
Hubei Qianfu Xiaoxia: You can pay attention to it, how many glue impurities do you put in the office?
Yang Zibiao: We are a 140 mesh filter, there is a little glue impurities after work.
Hubei Qianfu Xiaoxia: Lower the rubber disc appropriately.
Jiangxi Yunlong Color Printing: There is too much old glue stuck under the knife.
Jingbao—RH: It is certain that there are impurities. How to prevent the impurities from getting stuck in the scraper is to adjust the scraper angle.
Hubei Qianfu Xiaoxia: If it is in the same workshop as the printing, it is best to use poor quality blankets.
Yang Zibiao: There is no glue under the knife, the new machine has not been turned on a few times.
Wuhan Printing-Yang: Find a way to filter the glue.
Jingbao—RH: Spring dust, flying dust, and fibers are all impurities, which can cause you headaches.
Li Gong: Change the blade first, then go from simple to complicated. Looking at the thickness of the line, there is no change in continuity. Try another pressure roller.
Shangpin Printing Zhang: I think the working concentration of the glue is a bit high, there are impurities in the glue, and the concentration is reduced by adding a solvent.
(Note: The above are some of the technical issues discussed in the group. Readers and friends who have different opinions or additions are welcome to submit to us: email@example.com or firstname.lastname@example.org. At the same time welcome to join our flexible packaging technology exchange QQ group: Total group: 121451012; Group I: 64311965; Group II: 37848282; Group III: 119411638; Group IV: 116162302; Group V: 256925591).