Six Kinds Of Recycled Plastics - LDPE
Six kinds of recycled plastics - LDPE
LDPE regeneration density Low pressure polyethylene (LDPE) process flow.
process
LDPE regeneration density Low pressure polyethylene (LDPE) process flow.
LDPE, also known as high-density polyethylene, which generally refers to plastic packaging film. Such as: packaging bag lining film, food packaging film, packaging film, plastic greenhouse film. The vast majority of this film is the primary color, but also light blue, gray and black, before the acquisition is best to separate the color card. Can not put the bottom pressure film, PP film together, can not put OPP and PVC film in. The acquisition and reuse of LDPE in many ways is the recycled LDPE process.
key steps
There are four key steps in the fully recycled LDPE process:
1. Crushing process. The actual effect of wet crushing cleaning is stronger. Because some good high pressure film if maintained good cleaning, do not need to add new material can blow the film again. Therefore, pay attention to cleaning during the whole process of crushing, when the crushing material flows into the stainless steel sink, it is best to turn over again to further clean the cleaning point.
2. Dry and impatient process. Generally, the residual water is dehydrated to the dryer, and if there is a standard, the drying is carried out, which can save utility bills and ensure quality, and naturally, we should pay attention to avoid secondary pollution of raw materials in the drying.
3. Granulation process. Particles produced by special extruders have two basic main uses: re-injection film and injection molding. The raw materials that go out in the 60-80 mesh can be re-injected; The raw materials out of the 40 to 60 mesh can take into account the quality requirements of the injection molding process. Generally speaking, the high pressure material is blown again, the good blowing primary color is almost blown black mucous membranes and plastic bags, and the price is lower after the injection of plastic.
4. The granulation process is generally cold water granulation. This process must pay attention to the difference in packaging model. One for injection molding and one for injection molding, just in case. In addition, the packaging bag for injection molding must be the outer bag Garry lining bag to prevent secondary pollution.
COLOWE reminds you that LDPE is resistant to a wide variety of solvents at room temperature, but aromatic and chlorinated hydrocarbon solvents can allow it to increase. Similar to HDPE, LDPE is very prone to natural environmental stress cracking.
