Warm Global Customers
With China Plastic Machinery
With China Plastic Machinery
Thermosetting plastic injection molding is a special plastic processing process, during which thermosetting plastics not only undergo changes in physical state, but also undergo irreversible chemical changes. This plastic initially exists in the injection machine in a linear or slightly branched form, with reactive groups and relatively low molecular weight on its molecular chain. After heating, it first transforms into a plastic with high fluidity, but under certain conditions, it may increase viscosity due to chemical changes and eventually solidify into a solid. In order to ensure a successful injection process, the material passing through the nozzle must have good fluidity. Once entering the mold cavity, the material will continue to heat and react with the hardener under the action of internal reactive groups or reactive active points to form macromolecules with a body structure. During this process, some low-molecular substances may be released, which need to be discharged in time to promote the smooth progress of the reaction.
The molding temperature must be strictly controlled, and a thermostatically controlled water heating system is generally used, with a temperature accuracy of up to б└1буC.
The mold clamping part of the injection machine should be able to adapt to the needs of the deflation operation, because the cross-linking reaction occurring in the mold will produce low-molecular substances.
In order to avoid the material staying in the barrel for a long time and causing hardening, the method of multiple mold replacement is usually used to shorten the residence time of the material in the barrel.
The injection pressure and clamping force of the injection machine should be greater than the pressure and clamping force of the injection machine used to mold thermoplastics.
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