The plastic must be sufficiently dried before molding. When the moisture-containing material enters the cavity, it will cause silver-like ecchymosis on the surface of the workpiece, and even water decomposition will occur at high temperatures, resulting in deterioration -----
The sheet for blister packaging is called hard sheet or film. Commonly used are: PET (polyethylene terephthalate) hard sheet, PVC (polyvinyl chloride) hard sheet, PS (polystyrene) hard sheet. PS hard sheet has low density, poor toughness, easy to burn, and produces styre-----
Today I would like to introduce one of the four sets of materials - four-piece cotton. Even materials that can be directly contacted by infants can be seen to be non-irritating to human skin and relatively gentle. The weight of the four-piece suit is related to the density of the raw materials. Th-----
The 40-square-meter home is a relatively small room type, so it is also very troublesome to decorate. Because the space is relatively narrow, it is necessary to satisfy every request of the family life and use every space to the full. Many people are very distressed when decorating the house. Here-----
The first category: a company that produces PP recycled materials bought ten tons of sulphur raw material woven bags, the raw materials are good, and the price is reasonable. There should be more than 10,000 yuan in profits. The actual situation is a loss of 10,000 yuan.-----
Toilets are now installed in every household, and toilets are commonly used by the general public. Fewer pits are installed in homes. Our homes are rarely exposed to the bathroom market until they are renovated. Generally limited to look at the brand, ask the price to buy home after a short time t-----
The false alarm caused by environmental noise refers to the alarm system generated under normal working conditions, which is inevitable in principle, and the fact is unnecessary, which is a false alarm. For example: hot air caused by false alarm of passive infrared intrusion detector; high frequenc-----