The combination of several materials can be used to make bags suitable for our needs, such as steam bags, cold bags, vacuum bags, etc. Indeed, in order to make the package, the customer must first ask the manufacturer to produce and package the bag that the manufacturer has said well. The manufacturer only makes different bags with different characteristics for you and corresponding materials according to different packaging products. Different types of food packaging bags can be customized according to customer requirements. The common bag types include three side seal, middle seal organ, side seal, self-supporting bag, etc.
General food packaging bags are made of composite, while common food packaging bags have composite types, such as:
Two layer composite: PA / PE or PA / rcpp; PET / PE or PET / rcpp
Three layer composites: PET / PA / PE; PET / Al / rcpp; PA / Al / rcpp
Four layer composite: PET / PA / Al / rcpp
In the process of making food packaging bags, no one will say this chemical substance, but will be divided into more detailed ingredients, so some people will ask what kind of food packaging materials? The following Hannah packaging will take you to know. When the material of food packaging bag is not made of composite single-layer material or composite material, it can be roughly divided into OPP material, PET material D, nylon material e, aluminum material f, CPP material, polyethylene material, etc. Opp materials can be divided into BOPP, OPP and Matt Kopp. For the thickness of 1.9c/2.3c/3.1c, the pet rice at least is 6000 meters; the materials can be divided into pet, VMPET and kpet; for 1.2C material thickness, at least 8000 m Pa; also known as New York nylon material. 1.5C material thickness, at least 6000 m aluminum meter; material is aluminum foil, 0.7c material thickness, at least 6000 m CPP m; materials can be divided into CPP, rcppf, vacuum aluminized cast polypropylene material, is a customizable number, a roll of material can also be customized; the thickness of the same material of LDPE and CPP number of rolls are customized. These are the materials we will use to produce food packaging bags.
Among them, the food packaging bag is generally PE based, depending on what product you are loading. Different products have different material requirements for the packaging bag. This kind of packaging bag is packed with composite bag, which is made of polyethylene (PE), polypropylene, nylon and polyester. These are the main types of membranes. Film production is divided into stretch film and blow molding film. For example, PET / PE is usually used for dry goods and frozen goods. Nylon composite CPP or other composite materials are generally used for high-temperature cooking. The materials are generally PE and PP.
PE material is soft, mechanical properties are worse than PP, representative products are general supermarket shopping bags, plastic film, garbage bags and so on.
PP material is hard, anisotropic (a gap is easy to tear), good mechanical properties, high temperature performance is better than PE, represented by bread bag. At present, the most commonly used food packaging materials are film materials, of course, there are also bottled and canned. For the film materials used in food vacuum packaging, it is necessary to ensure that the packaging effect, beauty, economy and other aspects of food can reach the best state. At the same time, food packaging bags also have higher requirements for light resistance and stability of materials. When a single material can not meet these requirements, the package is often composed of a variety of different materials. According to the combination of the above materials, the product needs what performance, and then according to its requirements.
Food packaging bag knowledge: how to solve the problem of food packaging bag curling after packaging?
First of all, the main reasons for package warping and deformation are as follows: 1. The heat resistance of the surface substrate film is poor; 2. The tension matching control of the composite substrate in the composite process is improper, which leads to the residual stress after aging, especially when the composite film thickness is thin; 3. The thickness of the composite film is inconsistent;. 4. 5. The curing time is not enough; 6. In the longitudinal heat sealing knife part, the running track of the composite film is not straight; 7. The heat sealing temperature is too high or the heat sealing time is too long.
Now that we have known the reasons, we should make corresponding adjustments to avoid unnecessary losses. The following are some countermeasures we have summarized: 1. Re select the surface substrate film, and remember not to be greedy to choose a little knowledge of the substrate; 2. Adjust the tension of each part of the composite processing equipment to make the shrinkage ratio of the two composite substrates equal as much as possible; 3 When compounding, the floating roller tension should be as uniform as possible; 4. Sufficient cooling; 5. Fully aging, but not making the material too mature, otherwise it is easy to cause adhesion, this degree must be well controlled; 6. Select the inner sealing base material with low temperature heat sealing property; 7. Adjust the heat sealing temperature to a suitable temperature. http://www.dgbpk.com/
Dongguan Beite packaging materials Co., Ltd
Dongguan special bag, plastic bag, plastic bag, plastic bag