The steel used for plastic molds covers a wide range, from ordinary steel to special steel. This was more obvious in the early days of plastic molds and is now becoming more advanced. Special steel has its own system. The chemical composition of mold steel is basically the same as that of alloy tool steel, [...]
When a mold designer designs a mold, he or she needs to choose correct mold steel for the mold, so the mold designer need to know some basic requirements for the performance of plastic mold steel: High rigidity and sound abrasion resistance, surface hardness of cavity should be 30—60 HRC and hardenability>55HRC, sufficient hardening depth [...]
Plastic mold is of multiplex varieties and specification. Due to it’s complicated shapes and low surface roughness, it is rather difficult to be manufactured. […]
Phenol resins are made from phenol and formaldehyde and mostly contain such fillers as wood meal, asbestos, craft paper and cloth. Molding will be a lot easier when being added with wood meal, […]
Urea resin can be produced through the reaction between urea ( ammonia) and formalin, catalyzed by acid or base. It is formed through compression molding adopting hard chrome plating model, […]
The substance is colorless and transparent, and can be colored freely, it is very hard and is of sound chemical resistance, water resistance, heat resistance, and fire resistance. […]
UP is the compound formed by the alkyd of unsaturated binary acid and ethylene monomer. The resin is a kind liquid of low viscosity, which will not produce gas when being solidified. Hence the molding pressure thereof is rather low. Intensified by glass fiber, it’s mechanical intensity will be much higher.
Major raw material for epoxy resin is reacted from propylene and benzene. The substance is adhesive to other substance, especially metals, and therefore, it can be made into adhesives. Another important feature is that it will not produce volatile substance when being solidified, and hence is of small shrinkage. Endowed with such advantages, it can [...]
Polyurethanes resin embodies the properties of foam, rubber, thermoplastic plastics as well as thermoset plastics, it can be used as elastomers, adhesives and coating etc and can also be adopted as synthetic fiber of large shrinkage. The substance is of high elasticity, obdurability and tensile strength, and can fight against the erosion from oil or [...]
The cellulose plastic is provided with high transparency and pliability as well as sound processability, fluidity and molding ability. The plastic has bright surface and sound dimension precision. It can be manufactured into fire resistance spectacles frame, tools, electric parts and transparent packing cases.