What are the methods of forming plastic products introduced in this course?
Commonly used molding methods have the following1, rolling formingCalendering is often used in thermoplastics. It is used to deliver plastic to a number of parallel, counter rotating hot rollers, which are rolled over many times2, tape castingCasting with dry plastic. It is soluble in the solvent of plastic, due to weight andspread to continuous operation of the metal belt, become thin layer of uniform thickness, then heating apparatus soft volatile agent, curing products, production of film or sheet.3, extrusion moldingExtrusion molding is often used in thermoplastics. This is a melt plasticized plastic which is extruded from the die cavity of the die at the head of the extruder and forms a profile similar to that of the die. It produces plates, pipes, bars, wires, profiles and so on
4 、 injection moldingInjection molding is often used in thermoplastics. It is similar to extrusion molding. The difference is that the molten plastic enters the closed mold through the nozzle and solidifies in the mold to produce the product. Multi production small package boxes, daily necessities, special-shaped parts, etc., it can also be used for lively plastic processing5, blow moldingBlow molding is often used in thermoplastics. This is the molten plastic in the mold, under the compressed air pressure, the plastic blow up, close to the mold surface. It is produced by punching and demoulding. It also produces many kinds of hollow packing containers, and also produces films, sheets and so on
6 、 heating moldingHeat - forming thermoplastics are used to heat the plastic sheet into an elastic state and then press it to form a mold attached to the mold. Production of dishware, disc type products.7, foaming moldingThe foaming molding adds the foaming agent to the foam, then the foam is injected into the mold and is solidified into a product. The utility model is used for making cushioning packages for precise instruments and meters.8, moldingMolding for thermosetting plastics. This is a powder, flake or granular thermosetting resins and additives, directly close mold in mold, heating, pressurizing, plastic and liquefaction, chemical reaction and curing, cooling after the products. Producing plates and electrical appliances, machinery parts,9, casting jade moldingCast molding for thermosetting plastics. The molding powder into the barrel heating to heat plasticizing, pressed into the mold, and the product complete solidification under pressure. Complex products production needs to block metal objects.10, casting moldingCast molding is used to heat resistant plastics. It is a thermosetting plastic that is plasticized and injected into the mold. It is cured at atmospheric pressure, cooled and released
