Things you need to be careful doing in the clear plastic injection molding Posted on : Aug 4 , 2022 By  GREFEE As the light transmittance of clear plastic is high, so there is a strict requirement for the surface quality of plastic products, such as no spots and patterns, porosity, whitening, fringing, black spots, discoloring and uneven gloss. Therefore, during the whole injection molding process, there should be a rigorous and special requirements for the raw material, equipments, molds…

Features and Uses of Common Injection Molding raw Materials Posted on : Aug 15, 2022 By  GREFEE Common raw materials for injection molding include the thermal-plastic injection modeling materials, injection molding materials, etc. Each kind of material and its characteristic have a wide product range. The following is the injection molding material selection guide according to the properties and use of different varieties of materials.   Polyvinyl Chloride (PVC) Features: Rigid PVC has high strength, excellent insulation, good chemical stability,…

Injection molding process of TPR material Posted on : Aug 23 , 2022 By  GREFEE Typical, according to the condition of the properties of material and material supplement, the inspection should be carried out to check the appearance and process properties of materials before molding. The supplied particle have varying degrees of water, solutions, and other volatile low molecular substances, especially the TPR of which the water content is always exceeding the allowed limit. Thus, TPR should be fully dried…

11 kinds of Surface Defects and Solutions of TPE Injection Molding Parts Posted on : Aug 17 , 2022 By  GREFEE TPE injection molding parts are commonly used in toy dolls, toy tires, sucker dolls, fitness equipment, sporting goods, auto parts, etc. TPE injection molding products often have surface defects. GREFEE, the TPE injection molding manufacturers in China has collected and concluded 11 common surface defects and the solutions for the TPE injection molding manufacturers. Whitening It refers to that the…

Influence of Mold Temperature on Injection Molded Products Posted on : Aug 10 , 2022 By  GREFEE The mold temperature is an important variable in the injection molding. No matter what kind of plastic injection molding, It must be ensured that the surface of the forming mold is basically wet. A hot mold surface render the plastic surface in a liquid status for a long period of time, and is fully enough to produce pressure inside the cavity. If the cavity…

Cause analysis of short shots of injection molded products Posted on : Oct 11 , 2022 By  GREFEE Short shot indicates underfeeding and the products is insufficiently filled, during which the end of the material flows is incomplete or Part of the multi cavity is not fully filled, especially in the thin-walled area or the end area of the flow path. It is presented that the melt condenses before the mold cavity is fully filled, and the cavity is not completely…

Properties of clear plastics and injection molding process Posted on : Aug 12, 2022 By  GREFEE Due to multiple advantages of plastic, such as light weight, great rigidity, simple molding, low cost and other aspects, clear plastic molding has been replacing the role of glass in the modern industry and daily used goods, especially the application in optical instruments and plastic bottle packaging industry, which is developed rapidly.  Since the clear plastic are required to be of high transparency and wear…

Methods to Solve the PC Injection Molding Issues Posted on : Aug 2 , 2022 By  GREFEE There are many factors which affect the quality of PC products in different aspects. As long as you grasped the following factors, the quality issues can be improved significantly.    Raw material The material used for injection is the transparent and colorless aggregate. Some of them are colored in mild yellow. The relative molecular weight is 2.3 × 10,000 · 3.2 × 10,000. Before…