There are many types of waste plastics, and there are many different patterns. They come from different industries. Plastics can be divided into thermoplastics and thermosets according to their structure and performance. At present, most of the plastics that can be recycled in China are thermoplastics because they are soluble and plastic.
Different sources of waste plastics cause different levels of utilization of waste plastics, and prices vary. The first is the color, the lighter the color (even colorless and transparent), the wider the scope of use, such as white, can be adjusted into a variety of other colors, but also back to white products, the same price is also high. Second, because of the needs of the product, various ingredients were added to the raw materials.
At present, from the domestic market point of view, the use of CaC03 (stone powder) determines the use value of waste plastics. The more CaC03 content, the lower the price. From the naked eye, the product is not bright, dull (except matte) CaC03 content will be more, from the feel will feel heavy, with the fire, the burned part will turn red out after the gray. In addition, we must also pay attention to the enhancement (referring to glass fiber) products. At present, the enhanced products that can be used are only PA, PBT, and PP, and the price is not high. There are also a variety of alloy materials. At present, there are only one type of ABS+PC available for sale in China, and others will not work. According to the proportion (density) of the raw materials, it can be judged whether the intermixed materials can be reused. The most common problems at present are ABS and PS intermixing, PC and PMMA intermixing, PVC sheet materials (bottle materials) and PEl'' films For intermixing, PE and PP are semi-intermixed. After these materials are mixed, it is difficult to use due to the similar density.
Commonly used methods to separate, so, intermixed material can not be crushed material, otherwise the price will be very low, and even no one wants.
General identification of waste plastics has the following steps:
1, see the color;
2, see the brightness (transparent material can be removed this step);
3, feel (feeling, smoothness);
4. Igniting (whether the flame color is smoke or not, whether it contains burning from the fire or not burning at all);
5, smell smell (all kinds of plastic taste is not the same, including flame retardants, etc.);
6, drawing (CaC03 more drawing is certainly not good, can not pull the enhanced silk).