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1. Injection molding
(1) Injection molding
Injection molding: also known as injection molding, its principle is to add granular or powdery raw materials into the hopper of the injection machine, the raw materials are heated and melted into a flowing state, driven by the screw or piston of the injection machine, poured through the nozzle and the mold The system enters the mold cavity where it hardens and sets. Factors affecting the quality of injection molding: injection pressure, injection time, injection temperature.
(2) Insert injection molding
Insert injection molding: insert molding (insert molding) refers to the injection of resin after the pre-prepared inserts of different materials are placed in the mold, and the molten material is bonded and solidified with the inserts to form an integrated product.
(3) Two-color injection molding
Two-color injection molding: refers to the molding method of injecting two different colored plastics into the same mold. It can make the plastic appear two different colors, and can make the plastic parts present a regular pattern or irregular moiré pattern, so as to improve the usability and aesthetics of the plastic parts.
(4) Micro-foaming injection molding process
Micro-foaming injection molding process: It is an innovative precision injection molding technology, which uses the expansion of pores to fill the product, and completes the molding of the product under low and average pressure. The microcellular foam molding process can be divided into three stages: first, the supercritical fluid (carbon dioxide or nitrogen) is dissolved into the hot melt adhesive to form a single-phase solution; Cavities, due to the instability of molecules caused by the decrease of temperature and pressure, a large number of bubble nuclei are formed in the product, and these bubble nuclei gradually grow to form tiny holes.
(5) Nano Injection Molding (NMT)
NMT (NanoMolding Technology): It is a method of combining metal and plastic with nanotechnology. After the metal surface is nano-treated, the plastic is directly injection-molded on the metal surface, so that the metal and plastic can be integrally formed. Nano molding technology is divided into two types of processes according to the location of the plastic:
1. The plastic is an integral molding of the non-appearance surface
2. The plastic is integrally formed for the exterior surface
2. Blow molding
Blow molding: the molten thermoplastic raw material extruded from the extruder is clamped into the mold, and then air is blown into the raw material, and the molten raw material expands under the action of air pressure, sticks to the wall of the mold cavity, and finally cools The method of curing into the desired product shape. Blow molding is divided into two types: film blow molding and hollow blow molding:
1. Film blowing
Film blowing is to extrude molten plastic into a cylindrical thin tube from the annular gap of the die of the extruder head, and at the same time blow compressed air into the inner cavity of the thin tube from the center hole of the die, and blow the thin tube to a diameter of Larger tubular film (commonly known as bubble tube), coiled after cooling.
2. Hollow blow molding
Hollow blow molding is a secondary molding technology that inflates the rubber-like parison closed in the mold cavity into a hollow product by means of gas pressure, and is a method of producing hollow plastic products. Hollow blow molding varies according to the manufacturing method of the parison, including extrusion blow molding, injection blow molding, and stretch blow molding.
1) Extrusion blow molding: Extrusion blow molding is to extrude a tubular parison with an extruder, clamp it in the mold cavity while it is hot and seal the bottom, and then pass compressed air into the inner cavity of the tube blank to inflate it.
2) Injection blow molding: The parison used is obtained by injection molding. The parison is left on the mandrel of the mould, and after closing the mold with the blow mold, the compressed air is passed through the mandrel to inflate the parison, cool down, and the product is obtained after demoulding.
3. Extrusion molding (profile)
Extrusion molding: Also known as extrusion molding, it is mainly suitable for the molding of thermoplastics, and is also suitable for the molding of some thermosetting and reinforced plastics with good fluidity. The molding process is to use the rotating screw to extrude the heated and melted thermoplastic raw material from the head with the required cross-sectional shape, then shape it by the shaper, and then pass it through the cooler to make it cold and solidified to become the desired cross-sectional shape. product.
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