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Types of base materials for composite flexible packaging
Composite flexible packaging is easy to sell and use. Composite films, such as paper / plastic composite films, plastic / plastic composite films, aluminum / plastic composite films, etc., are made by compounding various substrates (mainly paper, plastic films, and aluminum foil). Plastic film is the main place among these substrates.
Different substrates have different functions in the composite film, according to which the substrate can be divided into: base film. Mainly give the composite film the basic packaging required performance, such as certain mechanical strength, barrier performance, transparency, etc .; functional layer film, give the composite film special functions, such as high barrier performance, gas selective permeability, etc .; heat sealing Adhesive layer film, so that the composite film can be heat-sealed and bonded. Usually the composite film is divided and called by its base film, plus polypropylene composite film, polyester composite film, nylon composite film and so on.
Almost all plastic films can be used as packaging materials, but the composite film base material is mainly a large variety, such as polyethylene (PE), polypropylene (PP), polyester (PET), nylon ( PA-6, PA-66), etc., and varieties with excellent functions (barrier properties, etc.), such as polyvinylidene chloride copolymer (PVDC). Ethylene and ethylene acid copolymer (EVOH), ionomer, etc. These substrates (plastic films) can be divided into calendered films, blown films, cast films (CPE, CPP), biaxially oriented films (BOPP, BOPET, BOPA), co-extruded composite films, etc. according to the forming process; The barriers are divided into very high barriers (such as PVDC, EVOH), excellent barriers (such as BOPA, BOPET, acrylonitrile copolymer), general barriers (such as CPE, CPP, BOPP) and so on.
Physical properties and application of composite flexible packaging substrate
Which kind of base material is used to form a composite film for composite flexible packaging depends on the nature, condition and packaging requirements of the packaged object. From what is now known, there are many types of items or commodities that can be packed with composite flexible packaging, such as beverages, juices and jams, oil stains, biscuits and dried vegetables and other dry foods, tea, milk powder and other powdery items. Medical products and supplies, meat products, hardware, etc., their characteristics and packaging requirements are different, some require freshness, some require fragrance, some require transparency, some require higher strength, and so on. Therefore, the basic physical properties of the substrate must be fully understood.
For the physical properties of the substrate, please refer to the "Packaging Materials and Containers Manual" published by Guangdong Science and Technology Press. Regarding the composition and packaging application of the composite film, pages 258 to 261 of the book “Packaging Materials and Containers Manual†provide the composition and packaging application of the BOPP composite film, BOPET composite film and BOPA composite film in more detail.
In addition to being determined by the packaging requirements, the processability and economy of the substrate (packaging cost), etc. must also be considered. The following is an example. Instant noodles, biscuits and other dry food packaging, audio cassettes, video cassettes, cigarettes and other outer packaging, candy and other small packaging, because the packaging requires moisture, anti-fouling, tightening, etc. At the same time, I hope that the packaging cost is low and the price is low The biaxially oriented polypropylene film (BOPP) is suitable as the base film of the composite film. In addition to the lower price of BOPP, more importantly, the water vapor transmission rate is very low.
Tea, coffee, milk powder, etc. require both moisture resistance and adequate fragrance preservation, so it is more appropriate to use a composite film with good gas barrier properties and high fragrance retention BOPET as the substrate. If higher barrier properties and resistance are required For ultraviolet light, a layer of aluminum foil or vacuum vapor-deposited aluminum film must also be combined.
Meat products, such as salami, ham, etc., require freshness, antisepsis, and a certain amount of moisture. A composite film with a nylon film as the base film is a very suitable flexible packaging material because the nylon film has a good oxygen barrier and has a large amount of water. Gas transmission rate.
Packaging for liquids such as beverages, juices, oil stains, and shampoos requires that the packaging be able to withstand squeezing. Therefore, strong substrates such as BOPET, BOPA, etc. should be selected. In addition, packaging for foods such as beverages and juices must also be kept fresh , Anti-corrosion, etc., so the barrier properties of the substrate must also be considered, BOPET, BOPA can meet the requirements.
For packaging of cooked food or articles, base films with good strength, such as BOPET, BOPA, and heat-sealing adhesive film with good heat-sealing adhesive strength and resistance to cooking, such as cast polypropylene film (CPP) ), Cast polyethylene film (CPE). Of course, whether the composite film made of them can be further cooked and retorted after being retorted and packaged depends on the type of adhesive (currently using polyurethane adhesives) and quality, as well as the production technology level.
Development of new base material for composite flexible packaging
The development of new substrates includes two aspects: films of new plastic varieties and new films developed by the modification of composite flexible packaging substrates. The films of the new plastic varieties are expected to be used for composite flexible packaging substrates, such as polycarbonate (PC), poly (2,6 ethylene naphthalate) (PEN), poly 4-methyl-1-pentene (TPX) etc. PC film is produced by casting method in China; the thickness can be 20μm. TPX film is resistant to boiling water cooking and non-toxic. The most important feature is that it has a large difference in the transmission rate of nitrogen and oxygen. It is especially suitable for packaging meat and vegetables. It has high heat resistance and can be used for cooking bags.
The new substrate developed through modification has isophthalic acid modified polyester film, and the barrier performance of this film is improved compared with that without modification; there are new varieties of films developed through blending or additive technology, such as high transparency Polyester film and polypropylene film, matte and white polypropylene film, etc.
In addition, the use of new post-processing technology to develop new substrates has also achieved new results in recent years, such as vacuum evaporation of silica on BOPET films to improve barrier properties, or the addition of a small amount of titanium during vacuum evaporation of aluminum to improve evaporation. The appearance and packaging effect of aluminum film.
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