(1) Material FeedingAdd a fixed amount of material into the mold according to production requirements. The feeding quantity directly affects the density, dimensional accuracy and other properties of finished products.Excessive feeding will cause thick flash burrs, poor dimensional accuracy and difficult demolding, and may even damage the mold. Insufficient feeding will result in low compactness, poor surface gloss, and even material shortage leading to defective products.

(2) Mold ClosingComplete the feeding, then close the male mold and female mold.Adopt fast first, then slow closing mode: close the mold at high speed at first, and switch to low speed when the two molds are about to contact.This method shortens non-production time, avoids mold surface scratch, prevents raw materials in the cavity from being carried out by air due to overly fast closing, and avoids displacement of inserts and damage of ejector pins. After full mold closing, increase pressure to heat and pressurize the raw materials.

(3) VentilationDuring compression molding of thermosetting plastics, moisture and low-molecular substances will be released. To discharge low-molecular volatiles, water vapor and air inside the mold, release pressure and slightly open the mold for a short period at the appropriate stage of curing reaction.Ventilation can shorten curing time, improve physical and mechanical properties of products, and avoid internal delamination and bubble defects.Ventilation timing must be controlled properly: too early will fail to exhaust gas; too late will cause surface curing of the material, making gas unable to discharge.

(4) CuringUnder molding temperature, keep holding pressure and heat for a certain period, so that the polycondensation reaction of resin reaches the required crosslinking degree, endowing the product with qualified physical and mechanical properties.For materials with low curing speed, curing can be suspended once the product is moldable, and complete full curing by post-curing treatment to improve equipment utilization.The compression curing time is generally from 30 seconds to several minutes, normally no more than 30 minutes. Either too long or too short curing time will adversely affect product performance.

(5) DemoldingDemolding is mainly completed by ejector pins.For products with forming rods or embedded parts, release the forming rods and inserts with special tools first, then carry out overall demolding.

(6) Mold CleaningAfter demolding, clean the mold cavity and mold surface with compressed air. For stubborn attachments on the mold, use copper knives or copper brushes for cleaning, and polish with polishing agent if necessary.

(7) Post-treatmentTo further improve product quality, thermosetting plastic products are usually treated at a certain high temperature after demolding.Post-treatment can complete resin curing thoroughly, eliminate or reduce internal stress, remove residual moisture and volatiles, and effectively improve the electrical performance and structural strength of finished products.