Analysis Of The Advantages And Disadvantages Of Thermoforming Raw Materials And Their Application

There are many kinds of raw materials such as plastic sheets and coils that can be used for thermoforming packaging products, and they are widely used. Among them, the more common blister packaging raw materials are: polyvinyl chloride (PVC) \ polyester (PET or PETP) \ polyethylene (PE) \ polypropylene (PP) \ polyvinylidene chloride (PVDC) \ polycarbonate ( PC) and other six kinds of plastic packaging materials. In practical applications, it is necessary to select suitable raw materials according to the requirements of the packaged products for blister packaging products. Such as: PET/PS and other anti-static sheets for electronic product packaging; environmentally friendly and non-toxic sheets for food blister packaging products; flocking trays for cosmetic product packaging, etc. The following are the advantages and disadvantages of the main raw material properties and applications.

Sheet for PVC Thermoforming Packaging – Polyvinyl Chloride (PVC Sheet):
PVC plastic sheets can be roughly divided into three categories: soft products, hard products and paste products. The plasticizer in soft products is about 20%, and the plasticizer in hard products is not less than 5%. Rigid PVC does not contain or rarely contains plasticizers, and its finished products have no peculiar smell of plasticizers, and have excellent mechanical strength, light weight and stable chemical properties, so the PVC blister containers made are widely used in beverage packaging. The PVC resin used for beverage blister packaging is only allowed to contain 1 mg of vinyl chloride monomer. The blister packaging products produced with this PVC material are used to package beverages, and vinyl chloride monomer cannot be detected in food.

PET thermoforming packaging sheet-polyester (PET/PETP sheet):
PET/PETP sheet is a colorless and transparent plastic material with good crystallinity and toughness. It has the appearance of glass, is odorless, tasteless, non-toxic, easy to burn, and has good air tightness. The expansion coefficient of PET plastic material is small, and the molding shrinkage rate is low, only 0.2%, which is one-tenth of polyolefin and smaller than that of PVC and nylon, so the size of the product is stable. In addition, the blister packaging products made of PET material have good mechanical strength, and their expansion degree is similar to that of aluminum. The film strength is 9 times that of polyethylene (PE), 3 times that of polycarbonate and nylon, and the impact strength is 3-3 times that of ordinary films. 5 times. The film has moisture-proof and fragrance-preserving properties. Although polyester (PET/PETP sheet) has the above advantages, its film is expensive, difficult to heat seal, and easy to be charged with static electricity, so it is rarely used alone, and most of them are made of resin with better heat sealability. composite film. In recent years, the production of PET blister bottles has developed rapidly, and heat-resistant PET bottles are widely used in tea beverages, fruit juice beverages and other beverages that require hot canning.

PE Thermoforming Packaging Sheet – Polyethylene (PE)
Polyethylene (PE) is the world’s largest synthetic resin in production and the most consumed plastic packaging material, accounting for about 30% of plastic packaging materials. Its performance advantages are mainly manifested in good transparency, softness, high elongation, better impact resistance and low temperature resistance than HDPE, and it is still used in various packaging.

PP Thermoforming Packaging Sheet – Polypropylene (PP)
Polypropylene (PP) plastic raw material has high crystalline structure, permeability is 1/4 to 1/2 of polyethylene (PE), high transparency, smooth surface, good processing performance, widely used in the preparation of fibers, molded products, commonly used in plastic film. All kinds of polypropylene (PP) plastic materials have a common characteristic of static electricity. In order to solve this problem, antistatic agents are generally coated on PP materials. Coating polyvinylidene chloride resin with good air tightness on PP plastic material can improve the oxidation resistance of PP. At present, polypropylene (PP) coated films with air tightness and easy heat sealing and composite plastic materials made of other films, cellophane, paper, aluminum foil, etc. have been produced in large quantities. Plastic packaging containers can be used for packaging of food, beverages and other products.

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