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2025
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EPE plastic (i.e. EPE pearl cotton) and polystyrene plastic (PS) have their unique advantages in their respective application fields, but also have some disadvantages. Here is a comparison of their drawbacks: The disadvantage of EPE plastic is relatively high cost: Although EPE plastic performs better than many traditional packaging materials, its production cost is relatively high, which may increase the overall cost of the product, especially in industries that require a large amount of packaging materials.
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EPE plastic is called Expandable Polystyrene, that is, polyethylene foam plastic, commonly known as pearl cotton. The following is a detailed introduction to EPE: 1. Low characteristic density: EPE plastic has a low density, making it widely used in packaging and filling fields. Good flexibility: This material has good flexibility, is not easy to break, and can adapt well to packaging needs of various shapes and sizes.
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If the open cell structure accounts for 90% -95%, the foamed plastic body of epp product is called open cell foam, otherwise it is called closed cell foam. Generally, some plastics can be made into foam plastics in more than one way, so they can be made into open cell foam plastics or closed cell foam plastics.
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So let's take a look at how the new generation of internet celebrities' helmets' were born. Why choose EPS for manufacturing EPS helmet lining? Mainly composed of three points: cheap, lightweight, and easy to use. Is it familiar? That's right, EPS is still a material for manufacturing plastic lunch boxes.
2025
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In the three process steps mentioned above, the formation of a uniform polymer and foaming agent mixed melt into a supercritical melt for EPP products is a very important first step. In order to obtain a supercritical melt, the first step is to obtain a suitable foaming agent, such as CO2, N2, or water, and make it a supercritical fluid.
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During the reaction injection molding process, once the components are mixed, they react quickly and the material can solidify to the point where it can be demolded. Therefore, specialized raw materials and formulas need to be used, and sometimes the product also needs to undergo heat treatment to improve its performance.
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For RIM units, it is not only required for the machine to complete the injection operation into the mold, but also to complete the chemical operation, that is, the raw materials composed of various chemical components are injected into the mold under uniform temperature, accurate and stable ratio, sufficient and uniform mixing and other process conditions to form polymer parts of the specified shape.
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In order to save energy, high-pressure cycling is only used for a brief period before and after plunger injection. The cooling medium is generally water, and a compressor cooling system can be used to form a closed-loop circuit for the cooling liquid.
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