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How to judge the quality when purchasing pearl cotton?
2021-09-14 1272
How to distinguish the quality of pearl cotton when buying?1. Touch texture. Generally speaking, coarse PE particles are likely to involve impurities;2. "Pinch" hardness. PE pipe strip has appropriate hardness and can pinch deformed pipe in a perfunctory manner. It is not PE pi
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Why does pearl cotton expand with heat and contract with cold?
2021-09-14 1222
Pearl cotton generally does not expand and contract with heat and cold. The amount is very small. The situation you mentioned may be that pearl cotton is damp. Pearl cotton is a porous structure. This weather is very simple to absorb water, and it will be fine and tight after absorbing water. Tr
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How are packaging materials classified?
2021-09-14 1272
There are many kinds of packaging materials.According to the applied methods, it can be divided into internal protection packaging materials and external packaging materials, which are mainly different in appearance. For example, internal protection packaging materials include PE film, bag,
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What are the packaging materials?
2021-09-14 1428
Compressed air sheetIt is a kind of packaging material, that is, air bubbles are sealed between two polyethylene sheets. This closure is cushioned by bubbles to achieve seismic effect. Compressed air sheet can provide excellent cushioning and good flexibility for light-weight items, and can
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Classification of common packaging materials
2021-09-14 1460
Product packaging is an important part of products. It not only plays a protective role in the transportation process, but also directly related to the quality of products. The following are our commonly used packaging materials:Paper packaging materials: packaging paper honeycomb paper bag
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Design requirements and characteristics of foam board
2021-09-14 1439
1. The thermal conductivity of EPS board is small in the range of density of 30 ~ 50kg / m. when the average temperature is 10 ℃ and the density is 20kg / m, the thermal conductivity is 0.033 ~ 0.036w / (m · K). When the density is less than 15kg / m, the thermal conductivity increases sharply