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PET sheet thermoforming technology

Edit:Dongguan Baizhou New Material Co., Ltd.UpDate:2018-07-14

Polyethylene terephthalate (PET) is a polymer produced by direct phenolation or ethylene glycol terephthalate and ethylene glycol vinegar by exchange method in our country. Although the development history is not long, with the rapid development of the packaging industry, the application of PET materials in China has been increasing year by year, especially in the film and sheet, which has also led to the development of PET sheet thermoforming technology. Thermoforming of PET sheets is generally produced on the original positive pressure, negative pressure or positive and negative pressure forming (blister) machines. The products produced are called thermoformed products, which are non-toxic, tasteless and environmentally friendly. “Green packaging materials” can replace PVC, PS, PP and other materials used in the packaging of eggs, fruits, vegetables, packaging cartons, food packaging and heat-resistant packaging, as well as simple packaging of tools (such as nails, nuts, screws) )Wait. Therefore, the prospect of PET thermoforming processing technology is very broad, and the market prospect of thermoformed products is very promising.

1The physical and mechanical properties of PET sheet for thermoforming PET is milky white translucent or colorless transparent body, belonging to thermoplastic resin, the relative density is 1.38, the refractive index is 1.655, the light transmittance is 叩%, and PET is a medium barrier material. The permeability coefficient for oxygen is 50 叩. Lining ~ plus 2 · d. MPa, the permeability coefficient for carbon dioxide is 180. M3·~2·small MPa, water absorption rate is 0.6%, and water absorption is large. Compared with other materials, PET has high tensile strength, comparable to aluminum foil, 9 times that of PE-HD, 3 times that of PC and PA; good barrier, stable size, high transparency, high impact strength, no It is odorless, easy to thermoform, and PET sheets can be made into various thermoformed products with complex shapes. The commonly used PET sheet is an amorphous PETP resin with a characteristic dryness of 0.6 to 0.7 dl, electricity. PET sheets can be produced by extrusion casting. The amorphous transparent sheet, which is also extruded and quenched by a T-type head, is also called an APET sheet, and has a thickness of usually 0.2 mm to 0.6 Å. APET sheets are available as a variety of transparent thermoformed packaging products. The crystallized PET sheet (CPET) also has high temperature resistance (15O to 200 ° C). Usually, the thickness is from 0.20 to 1.00 Å, and the CPET cast sheet can be used as a thermoformed article. The crystal-modified PET sheet (CPET) also has high temperature resistance (150-200 ° C) characteristics. Usually the thickness is 0.20 ~ 1. ~, CPET cast sheet can be used as a thermoformed product. The requirements for thermoforming are as follows: 1. It has good heat elongation, high height to diameter ratio (ie stretch ratio), good elongation; 2 has high tensile strength, impact strength and needle resistance. Porosity; 3 products with composite requirements, need to have good thermal strength; 4 good transparency and gloss, easy to sell the goods packaged; 5 waste packaging easy to handle; 6 products for food and pharmaceutical packaging also Should have non-toxic, odorless or low-flavor requirements; 7 products with color printing requirements, corona treatment. The general physical and mechanical properties of PErr sheets suitable for thermoforming are shown in the table.

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