Due to the high light transmittance of transparent clear plastic profiles, the surface quality of transparent profile products is very strict, and there should be no defects such as markings, pores, white haze, black spots, discoloration, and poor gloss. Therefore, the raw materials, The design of equipment, molds, and even products must pay great attention to and put forward strict and even special requirements.
In the last post, we have talked about the common problems that should be paid attention to in the process of transparent plastic profile extrusion. Today let’s talk about the raw material preparation stage for transparent clear plastic profiles to improve transparency.
What are the requirements for raw material selection in clear plastic profiles extrusion and what should be paid attention to?
1. Preparation and drying of raw materials.
If there is any impurity in the plastic resin, it may affect the transparency of the clear profiles. During the feeding process, attention must be paid to sealing to ensure that the raw materials are clean. In particular, if the raw materials contain water, it will cause the raw materials to deteriorate after heating, so drying is necessary, and when extruding, a drying hopper must be used for feeding. It should also be noted that during the drying process, the input air should preferably be filtered and dehumidified to ensure that the raw materials are not polluted.
2. The cleaning of the barrel, screw, and accessories
This is to prevent raw material contamination and old materials or impurities in the recesses of the screw and accessories, especially resin with poor thermal stability. When there is no screw cleaning agent, you can clean the screw with a resin such as PE and PS.
3. Temperature controlling
When temporarily shutting down, in order to prevent the raw materials from staying at high temperatures for a long time, causing the solution to drop, the temperature of the dryer and barrel should be reduced, such as PC, PMMA and other barrels should be reduced to below 160 ℃. (The hopper temperature should be lowered to below 100℃ for PC)
Dongguan H.D. Plastics products are specialized in the production of clear plastic profile extrusion. We can customize and process a variety of plastic profiles, PVC profiles, ABS profiles, PP profiles, plastic corners, and PC lampshades, as well as different types of plastic tubing: ABS Tubing, PVC pipe tubing, PC Pipe, Square transparent Pipes.
Please choose H.D.Plastics for your new plastic project with a superior plastic extrusion production capability with 15 extruders to meet your high volume production. On-time delivery can be assured with our professional quality check and productivity.