Plastic profile injection and blow molding process what is the difference?
Plastic special-shaped material products have all kinds of different shape/size is qualitative, also widely in use, industry, life, medical and so on have their tracks, different shapes of plastic different profile production process there are a lot of kinds, such as extrusion, injection molding, blow molding and so on craft, which? Let's talk about the injection molding and blow molding for two kinds of production process what is the difference?
Blow molding products are hollow; Plastic profile injection molding because there is injection molding mouth, so the product after molding will be more than a small fast part, youdao process to cut it off, but if carefully observed or can be found;
Injection molding (injection molding) is a method by which thermoplastic or thermosetting molding materials are uniformly plasticized in a heated cylinder and then pushed into the cavity of a closed mold by plunger or moving screw.
Injection molding is applicable to almost all thermoplastic profiles. In recent years, injection molding has also been successfully used to form some thermosetting plastics. The injection molding cycle is short (a few seconds to a few minutes), the quality of molding products can be from a few grams to dozens of kilograms, can be a complex shape, accurate size, with metal or non-metal insert molding products. Therefore, this method has strong adaptability and high production efficiency
Blow molding: a method of blowing hot billets closed in the mold into hollow products or tube billets into tube film without mold by means of gas pressure. This method is mainly used in the manufacture of various packaging containers and tubular films.
Those whose melt index is 0.04~1.12 are all excellent blow molding materials, such as polyethylene, polyvinyl chloride, polypropylene, polystyrene, thermoplastic polyester, polycarbonate, polyamide, cellulose acetate and polyacetal resin.
(1) injection blow molding: the plastic is first made into a bottom-shaped billet by injection molding method, and then the billet is transferred to the blow mold to make hollow products
(2) extrusion blow molding: the plastic is first made into a bottom shaped billet by extrusion method, and then the shaped billet is transferred to the blow molding mold to make hollow products.
(3) stretch and blow molding: stretch and blow molding is a kind of blow molding with biaxial directional drawing. The method is to first conduct longitudinal stretching of the mold, and then use compressed air to conduct blowing and reach horizontal stretching. Stretch blow molding can greatly improve the transparency, impact strength, surface hardness and rigidity of products. It is suitable for blow molding of polypropylene and polyethylene terephthalate (PETP).
(4) blowing film method: a method for forming thermoplastic film. This is a tube film which is made by extruding the plastic into tubes, and then expands to a certain size with the help of the air blown into the tube, and then folds and rolls into a double layer flat film after cooling
Teng plastic products is specifically focused on production (bet) of plastic profiles, can customize for mould processing a variety of plastic different profile, PVC profile, ABS extruding, PP special-shaped material, plastic beads, PC chimney, plastic profiles, the hospital handrails and profile. Its own mold room, professional for the enterprise to provide all kinds of special-shaped material solution, design customized mould processing production experience for many years.