无码无套少妇毛多18pxxxx,日韩欧美一区二区福利视频,17c视频在线观看,中文字幕久久久久久妻,日本黄色精品专区网站

Polyethylene PE foaming is mainly divided into non-cross-linked and cross-linked extrusion foaming methods through extrusion foaming, which mainly uses physical or chemical foaming agents to realize continuous production of PE foam sheets, plates, pipes and rods. Due to the poor anti-slip properties and poor resilience of PE foam materials, the existence of cross-linked structures in PE foam materials makes them unable to be recycled; the weather resistance and reusability of physical foaming PE materials need to be improved.

Adding polyethylene PE foam to the lining of the backpack can not only improve the comfort of the backpack, but also increase the protection of the items in the bag, especially the computer backpack, so that the backpack can be used to improve the protection in the event of an accidental collision. Polyethylene closed-cell foam board is used in construction, water and electricity functions, etc. to replace three-oil four-felt, asphalt fir board and other materials. The closed-cell foam board must have its outstanding characteristics.

The specifications of polyethylene PE foam original board are (1600--1950)×(800--950)×50mm. According to user needs, it can be arbitrarily processed to produce boards, strips, and slices of different thicknesses of 5-50mm with a cutting error within the range of ±0.2 to ±1. L-1100 polyethylene closed-cell foam board has the characteristics of low density, high recovery rate, and independent bubble structure. Low surface water absorption and good anti-penetration performance. Corrosion-resistant to acid, alkali, salt, oil and other organic solvents.

Most polyethylene PE foam insulation materials cannot be exposed to high and strong temperatures for a long time. Installing polyurethane foam insulation materials in an exposed environment will cause the insulation materials to emit harmful chemicals. On the one hand, the internal moisture is effectively evaporated, and on the other hand, the polyurethane composite board can be formed during this period. The polyethylene PE foam after forming is fully in hardness and shape.