Follow us
Home > Exhibition > Content
What kind of materials are used in plastic bags?
Jul 18, 2018


There are many types of plastic bags on the market. The materials used to make the plastic bags are different. The color, feel, smell and stability of the plastic bags are different. Today, the PVC bags  factory tells you what materials are made in the plastic bags.


1. Shrink film

Shrink film is a thermoplastic film that is stretched and oriented during the production process and shrinks during hot air treatment or infrared irradiation during use. After heat treatment, the film is tightly wrapped around the package, and the shrinkage force reaches a maximum during the cooling phase and can be stored for a long time.


2.Polyethylene

Referred to as PE. It is a high molecular organic compound obtained by addition polymerization of ethylene. Polyethylene is recognized as the best material for food contact in the world. Non-toxic, odorless, odorless, in line with food packaging hygiene standards. Polyethylene film, light and transparent, with moisture, oxygen, acid, alkali, air tightness, heat sealing and other properties. It is the most important and most important material for plastic packaging printing. Plastic bag PVC--PVC


3. Polyvinyl chloride

Referred to as PVC, the molecular formula is (CH2-CH2)n, which is the most important type of vinyl polymer. It is the second largest plastic product in the world after polyethylene.


4. High density polyethylene

High density polyethylene, referred to as HDPE. It is made of low pressure polymer, so it is also called low pressure polyethylene. It is milky white, indicating poor gloss. The processed film can be blow molded and T-die extruded. Heat-resistant and resistant to cooking, cold and cold resistant, moisture-proof, gas-proof, good insulation performance, and not easy to break, the strength is twice that of LDPE. Very easy to open. PE plastic bag


5. Low density polyethylene

Low-density polyethylene, referred to as LDPE, is the largest variety in the plastic packaging and printing industry in various countries. It has a specific gravity of 0.92 to 0.93 and can float in water. The crystallinity is low (60%), and the bulk polymerization is carried out at a pressure of 1000 to 3000 kg/cm 2 , so it is also called high pressure polyethylene. At 23 degrees Celsius, the density is around 0.92. Applicable to food packaging, fiber packaging, and daily chemical packaging.


6. Biaxially oriented polypropylene film

Biaxially oriented polypropylene film, also known as biaxially oriented polypropylene film, the English abbreviation code BOPP, which is characterized by tensile molecular orientation, mechanical strength, folded strength, gas density, moisture barrier is superior to ordinary plastic film.


7. Ethylene-vinyl acetate copolymer


Ethylene Vinyl Acetate, referred to as EVA, E/VAC. The polymerization method uses high pressure bulk polymerization (for plastics), solution polymerization (PVC processing aid), emulsion polymerization (binder), and suspension polymerization. Ethylene acetate (VA) content higher than 30% using emulsion polymerization, low ethylene acetate content using high pressure bulk polymerization


The above are the common plastic bag manufacturing materials. How much do you know? The PVC bags and EVA bags produced by PVC and EVA bags factories have the advantages of cold resistance, moisture resistance, exquisite appearance, practical durability, environmental protection and health, etc., and are widely used.