Blow Mould With High Heat Resistance And Good Corrosion Resistance
As we all know, in terms of blow molding, there must be a molding of the blow molding products, must have blow mold, then the blow mold design and processing requirements is what?
The material of the Blow Mouldproduct of the mold must have high thermal conductivity and sufficient cutting edge strength. The current aluminum 70/75 is the production of most of the mold with the advanced alloy.
As the machinability of the metal is good, the mold cavity is usually machined. Copper alloy die also has high heat transfer and good corrosion resistance. However, its high cost, expensive, and because of its proportion three times the aluminum, may be in the molding machinery wear more serious. Steel alloy mold is easy to use welding or mosaic method repair.
The thermal conductivity of cast aluminum molds is worse than that of cutting aluminum molds. The cavity of the mold cavity usually requires broken copper alloy or stainless steel mosaic, because the strength and hardness of cast aluminum can not meet the requirements of cutting the edge of the blade.
Blow molding products in the mold design of the cooling of the challenging and very important significance. Drilling cooling lines are installed in places where cooling is most needed. For better production control, most molds are designed with several independent cooling zones. The neck and the bottom need to discharge the most heat, which requires the most effective cooling.
Cut the mouth. The design depth of the billet area of the blown product may be a significant factor in component yield and quality. The cut area is where the excess plastic is blown into the part. The type and shape of the billet may determine the welding of a component.
Blow molds play a vital role in blow molding and are the decisive factor in the quality of the final Blow Mouldproduct.
Extrusion blow molding is a method of making hollow thermoplastic parts. Well known blowers are bottles, barrels, cans, boxes and all containers of packaged food, beverages, cosmetics, medicines and daily necessities. Large blown containers are usually used for packaging of chemical products, lubricants and bulk materials.
Other Blow Mouldproducts are ball, bellows and toys. For the automobile manufacturing industry, fuel tank, car shock absorber, seat back, center bracket and armrest and headrest cover are blow molding. For the machinery and furniture manufacturing industry, blow molding parts are housings, door frames, racks, pots or boxes to have an open face.
The most common blown extruded plastic raw material is high density polyethylene, and most of the milk bottles are made using this polymer. Other polyolefins are often processed by blow molding. Depending on the application, styrene polymers, polyvinyl chloride, polyester, polyurethane, polycarbonate and other thermoplastics can also be used for blow molding.
Recently engineering plastics are widely accepted in the automotive industry. Material selection is based on mechanical strength, weatherability, electrical properties, optical properties and other properties.
3/4 Blow Mouldarticles are manufactured by extrusion blow molding. The extrusion process is forced to produce the product through a hole or die.
The extrusion blow molding process consists of five steps: 1. Plastic mold (hollow plastic tube extrusion); 2. In the embryo will be closed on the mold, clamping mold and cut off the embryo; 3. To the cavity of the Cold wall inflation type training, adjust the opening and maintain a certain pressure during cooling; 4. Open the mold, remove the blown parts; 5. trim the flash to get the finished product.
The polymer blending is defined as a process of increasing the grade of the polymer or polymer system by melt mixing. The mixing process from the addition of a single additive to a variety of additive treatments, polymer alloys and reactive mixes, has a wide range. It is estimated that one third of the US polymer production to be mixed. The mix can be customized according to the final application performance requirements. Mixing products have miscellaneous properties such as high gloss and excellent impact strength, or precision molding and good stiffness.
Mixing good polymers are usually pelletized for further processing. What is increasingly interesting in the industry, however, is the combination of mixing and the next process, such as extrusion of the profile, which avoids the heating of the polymer again.
People use various types of melt mixing equipment, from roller and batch mixers to single screw and twin screw extruders. Continuous mixing (extruder) is the most commonly used equipment, because he can provide consistent quality products, and can reduce operating costs. There are two types of mixing: distributed mixed materials in the mix without the use of high shear stress can be evenly distributed. Such mixtures are known as extensible or laminar mixing.
Dispersed mixing is also known as strong mixing, where high shear stress is applied to break the solid clusters. For example, when the additive mass is broken, the actual particle size becomes smaller.
Mixing operations often require two types of mixing in a process.