Plastic mould common sense - injection
Plastic mould common sense - injection
Hollow blow molding is a manufacturing method of thermoplastic parts.Known object of blow molding bottles, barrels, cans, boxes, and all food, beverage, cosmetic, medicine and daily necessities of the container.Large blow molding containers are normally used for chemical products, lubricants and bulk materials on the package.Blow molding products and corrugated pipe and other toys.For car manufacturing industry, fuel tanks, car shock absorbers, seat back, center bracket and armrest and headrest cover is blown.For machinery and furniture manufacturing, blow molding parts have enclosure door frame, system frame, clay, or to have an open boxes below.
polymer
The most common plastic raw material is high density polyethylene blow molding, most of the milk bottle is made use of the polymer.Other polyolefin are often processed by blow molding.According to the purpose, styrene polymers, PVC, polyester, polyurethane, polycarbonate and other thermoplastics can also be used to blow molding.Recent engineering plastics in the automotive industry has been widely accepted.Materials selection in mechanical strength, weather resistance, electrical properties, optical properties and other properties.
process
Three-quarters of blow molding products was made by extrusion blow molding.Material extrusion process is to force through a hole or a mold to manufacture the product.Extrusion blow molding process consists of five steps: 1. The plastic type embryo (2 hollow embryo will flap in the mold closed, clamping mould and cutting off the embryo;(3) to the cavity, the blowing cold wall type of adjusting openings and keep a certain amount of stress during cooling, open mold, unload blown parts;5. Trim flash get finished product.
extruded
Polymer mixed with defined through melt blending the polymer or polymer system, improve the level of a process.Mixed process from a single to handle a variety of additives of additives, polymer alloy and reactive blending culture, its broad range.It is estimated that the United States a third of the polymer production after mixed.Mix ingredients can be customized according to the performance requirements of the final application.Mixed product has's performance, such as high gloss and excellent impact strength, or precision molding and good rigidity.Polymer mixed with good is usually cut for further processing.Industry became more interested in is, however, will be mixed together with the process of the next step, profile extrusion, for example, this can avoid reheating polymer.
hybrid
People use various types of melt mixing equipment, from roller mill and batch mixer to single screw and twin screw extrusion molding machine.Continuous mixing ration (squeeze molding machine) is the most commonly used equipment, because he can provide consistent product quality, and can decrease the operation cost.There are two types of hybrid: distributed hybrid product material to remarry without using high shear stress in the recipe can be evenly distributed.This kind of mixture is called the extensibility or laminar flow mix.Decentralized hybrid Also known as strong mixing, which is broken by applying high shear stress cohesive clouds of solids.When the additive material group is broken, for example, the actual particle size becomes small.Mixed operation often need two in the process of a kind of mixed type.
