This product is a kind of
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chain oil.
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Ultra-practical program to reduce plastic parts shrink
For large-scale home appliance precision plastic mold products with high surface quality requirements, shrinkage (shrinkage) is a big problem. This is the enemy of plastic mold processors, for which various technologies have been developed to minimize shrinkage and increase product dimensional stability and appearance.
In the thicker position of the plastic mold part, such as the rib rib (commonly known as the bone position), the contraction is more serious than the adjacent position, because the thicker area is cooled much more slowly than the surrounding area. The difference in cooling rate results in the formation of a depression at the joint surface, which is a familiar shrinkage mark. There may be one or more reasons for the formation of shrink marks, including processing methods, component geometries, material selection, and mold design, where geometry and material selection are typically determined by the raw material supplier and are less susceptible to change. Moldmakers have a lot of factors about mold design that can affect shrinkage, cooling runner design, gate type, gate size can have multiple effects. For example, small gates such as tubular gates cool much faster than tapered gates, and premature cooling at the gates reduces fill time in the cavity, increasing the chance of shrink marks.
For molding injection workers, adjusting the injection molding process is one way to solve the shrinkage problem. The injection pressure and time also affect the shrinkage. After the parts are filled, the excess material continues to fill the cavity to compensate for the shrinkage of the material. Too short a shot time will result in increased shrinkage and eventually more or larger shrinkage marks. This method may not reduce the shrinkage marks to a satisfactory level by itself, but the molder can adjust the filling conditions to improve the shrinkage marks.
In addition to the above methods, modifying the mold is the easiest solution. It is possible to try to modify the conventional core hole. This method is not necessarily applicable to all resins, and the gas-assisted method also improves the situation to some extent. In addition, plastics that replace the shrinkage of composite molds are also a method. Materials such as glass fiber reinforced and mineral fillers are beneficial to reduce molding shrinkage, replace plastics of different materials, and have different shrinkage rates.