Why the mold cavity surface should use mold release agent?How to choose mold release agent?
The moulding of injection moulding products is successful or not, mainly depending on the rational design of mold structure and reasonable selection of process parameters in injection molding.In the production process of injection molding plastic products, due to the fluctuation of technological conditions, it is sometimes difficult to remove the products.In order to ensure the production of injection molding products, avoid because products demoulding difficulty caused by the extension of injection molding products production cycle, in injection molding products production, the cavity surface to spray or brush coating a layer of mold release agent.
The selection of mold release agent is determined by injection molding material.In addition to polyamide resin, the injection moulding of other raw materials can be applied.The other is liquid paraffin wax (commonly known as white oil), which is mainly used for the demodulation of polyamide products.There is also the silicone oil mold release agent, it has good effect, but the price is more expensive.At present the application is more, the operation is very convenient also is to use spray atomization release agent.TG series methyl silicone oil and TB series liquid paraffin and TBM series castor oil are sold in the market.The selection of mold for different plastic forming products can be referenced in table 1.
Table 1 the selection of moulding agent for different plastic products.
Name of raw material name of raw material name of raw material.
TG series (methyl silicone oil) commonly used in polystyrene -ABS methyl silicone oil
Hard or reinforced plastic stearate PC, POM polysiloxane mold release agent.
The polysiloxane type of polysiloxane is used in various plastics, except polyamide.
Polyamide liquid paraffin wax is commonly used in plastic carbon fluorine.
No matter which kind of mold release agent, in the spraying dosage should try to control less use, in order to enable the product to smooth out the mold.The amount of mold release agent affects the appearance quality of the products, and the appearance of oil spots or the surface of the products is dark, especially the products with high transparency requirements are more influential and sometimes forbidden to use.For those plastic products with high appearance quality, they can only apply the mold release agent in the area where the product is moulded.