First, polystyrene -
PS Polystyrene commonly used in the production of refrigerators includes general purpose polystyrene (GPPS), high impact polystyrene (HIPS), and expandable polystyrene (EPS).
Polystyrene is the most widely used plastic in the production of refrigerators, and its dosage accounts for more than 60% of the total plastics used in refrigerators.
GPPS: It has good dimensional stability and low shrinkage. It is mainly used for injection molding to make transparent and hard parts in refrigerators, such as vegetable boxes and bottle holders.
HIPS: It is a toughened modified polystyrene with good impact resistance and good ductility after heating. Mainly used in the manufacture of refrigerator liners and door linings, the processing technology adopted is vacuum adsorption molding.
EPS: Good shock absorption performance, mainly used for manufacturing shock absorption auxiliary materials in the packaging and transportation of refrigerator products.
Second, polyethylene - PE
Non-toxic, odorless, odorless, with good impact resistance and chemical resistance, low water permeability. Mainly used in the manufacture of various pipes, refrigerator companies usually use the process of blow molding to process.
Third, polypropylene - PP
The production process is simple, the price is low, the injection molded product has high toughness and surface smoothness, and has good chemical corrosion resistance, and is mainly used for manufacturing refrigerator drawers in the production of refrigerators.
Fourth, polyurethane - PU
In the polyurethane products, the foaming material accounts for more than 80% of the total amount, and has the characteristics of low thermal conductivity and good processing performance, and is very suitable for heat insulation, so it is widely used for the partition of the refrigerator door and the cabinet. Hot layer.
The heat insulation layer is a key component of the refrigerator. Most refrigerator manufacturers adopt the on-site foaming process. The polyol, isocyanate and cyclopentane are used as the main raw materials, and are filled into the door body of the refrigerator and the heat insulation layer of the cabinet at a certain high temperature. Under foam molding, and by adjusting the different ratios between raw materials, control the speed of foaming and cellbing effect to obtain the desired heat preservation effect. Among the required plastic costs, PU accounts for approximately 40-50% of the cost.
Five, acrylonitrile-butadiene-styrene - ABS
Excellent overall performance such as high strength, good gloss, easy processing, and low product shrinkage. It is mainly used for processing exterior parts such as door handles and various decorative strips.
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