The product is widely used in transportation and public buildings such as optoelectronic communication, power, aviation, aerospace, automobiles, high-speed rail, etc.
(1) Feeding: Inject a certain amount of information into the mold as needed, and the amount of feeding directly affects the density and size of the finished product. If the amount of material added is large, the finished product will have thick burrs, poor dimensional accuracy, difficult demolding, and the SMC composite material sheet may damage the mold; If the amount of added material is small, the finished product will not be closely packed, the luster will be poor, and even a shortage of materials will occur, resulting in waste.
(2) Close the mold: After adding the material, the male and female molds will be closed. When closing the mold, use the fast speed first, wait for the Yin and Yang molds to engage, and change to slow speed when engaging. The manipulation method of "fast first, slow later" is beneficial for preventing mold damage during non consumption shrinkage, avoiding the material from being worn out by the atmosphere due to rapid mold closing in the mold slot, and causing displacement of the embedded parts and damage to the forming rod. After the mold is closed, the pressure can be increased to heat and pressurize the raw material.
(3. Exhaust: When molding thermosetting plastics, moisture and low molecular weight substances are often released. In order to eliminate these low molecular weight substances, evaporated substances, and the atmosphere inside the mold, the plastic in the mold cavity can be depressurized and released for a short period of time after the appropriate time. Exhaust operation can shrink and solidify the material and promote the physical stagnation of the finished product, avoiding delamination and slow bubbles inside the finished product. However, exhaust is not done too early, morning or evening, and there is no way to exhaust it too early. If it is too late, the gas cannot be discharged due to the solidified surface of the material.).
(4) Curing: The curing of thermosetting plastics is maintained at the molding temperature for a period of time, and the SMC composite material sheet reflects the polymerization of the resin to the desired bonding level, so that the finished product has the required physical hysteresis. Plastics with low curing rates can be temporarily interrupted when the finished product is fully demolded, and then disposed of afterwards to complete the entire curing process; To popularize the application rate of equipment. When molding and curing, it is often necessary to maintain pressure and insulation, usually for 30 seconds to several minutes without waiting, and generally not exceeding 30 minutes. The instinct of curing too long or too short has an effect on the finished product.
(5) Demoulding: Demoulding is often completed by pushing out the rod. For finished products with molded rods or certain embedded parts, the molded rods should be first removed with a wooden object, and then demolded after falling off.
(6) Mold blowing: After demolding, SMC composite material sheets are often blown with a compressed atmosphere to clean the mold cavity and mold surface. If the fixtures on the mold are tight, a copper knife or brush can be used for cleaning, and even a polishing agent brush is required.
(7) Post disposal: In order to further promote the quality of finished products, thermosetting plastic products are often subjected to post disposal at higher temperatures after demolding. Post disposal can make plastic solidification more solid; Simultaneous reduction can eliminate the internal stress of the finished product, reduce the moisture and evaporation in the finished product, and promote the electrical properties and strength of the finished product.