How to make ABS plastic in the injection molding
What is abs plastic material?
ABS, commonly known as acrylonitrile butadiene styrene, is made from the copolymerization of three monomers, acrylonitrile, butadiene and styrene. Therefore, the ABS resin material has the common properties of the three components. In the ABS structure Acrylonitrile makes it resistant to corrosion, heat-resistant, and good surface hardness; butadiene makes it highly elastic and tough; styrene has good thermoplastic processing properties. ABS plastic resin is easy to get the raw materials, has superior overall performance (toughness, hardness, rigidity), low price in the market and wide range of uses. Besides, it is also the most commonly used plastic material in the.
ABS structure acrylonitrile butadiene styrene
ABS plastic properties
ABS plastic is non-toxic and tasteless, with the color of ivory-colored translucent.
The heat distortion temperature of ABS resin is 93 ~ 118 ℃, and the product can be increased by about 10 ℃ after annealing treatment. ABS resin can be used in the temperature range of -40 ~ 100 ℃.
ABS plastic has excellent mechanical properties of impact strength. ABS has also outstanding wear resistance, dimensional stability, and oil resistance, these features allow it for making the bearing with medium loads and low speeds. ABS has greater creep resistance than PSF and PC, but less than PA and POM.
Plastic ABS has good electrical insulation and is almost unaffected by temperature, humidity and frequency.
All of these abs properties make it to be one of the most popular plastic materials in the plastic molding industry.
In short,the ABS plastic advantages are as follow:
1. Good liquidity
2. Excellent impact resistance
3. Easy to form
4. Easy to color and spray
5. Good corrosion resistance
6. Matt effecting
Different types of abs material
A series of different types of ABS plastic can be produced by changing the formula of ABS or using different additives to meet the various requirements in the industries.
According to the impact strength: ultra-high impact type, high impact type, medium impact type, etc.
According to the ABS uses: general grade, heat-resistant grade, electroplating grade, flame retardant grade, transparent grade, antistatic, extruded sheet grade, pipe grade and other varieties according to the characteristics of use and performance.
ABS plastic uses
The application fields of ABS resin are automobiles, electronic appliances and building materials. ABS plastic uses in the automotive field to make the dashboards, body panels, interior trim panels, steering wheels, sound insulation panels, door locks, bumpers, ventilation pipes, and many other components.
In terms of electrical appliances, it is widely used such as refrigerators, televisions, washing machines, air conditioners, computers, copiers and so on.
In terms of building materials: ABS pipes, ABS sanitary ware, and ABS decorative boards are widely used in the building materials industry.
In addition, ABS is also widely used in packaging, furniture, children's toys, sports and entertainment products, machinery and instrument industry.
The manufacturing condition of ABS injection molding
ABS plastic drying: in winter: 75 ～ 80 ℃, dry time 2 ～ 3h, in summer 80 ～ 90 ℃, dry 4 ～ 8h.
ABS plastic has high hygroscopicity and sensitivity to moisture. Fully drying and preheating before processing can not only eliminate the fireworks like bubbles and silver thread on the surface of the part caused by moisture, but also help the plastic to reduce the color spots on the surface of the workpiece. ABS materials should control the moisture below 0.1%.
ABS melting point: 220 ~ 250 ℃ is good for the abs melting temperature. Since the melting point temperature of ABS is high and it is sensitive to the process parameters, it is necessary to control the melting point temperature of the front end of the barrel and the nozzle part. Practice has proved that any small changes will be reflected in the product, such as melting marks and sink marks.
Injection molding pressure: 50-100pa. The viscosity of ABS melted parts is higher than that of polystyrene or modified polystyrene, so it needs higher injection pressure. Of course, not all ABS parts require high pressure, for small thick parts need just lower injection pressures.
Injection molding speed: ABS material with medium injection speed works better. When the injection speed is too fast, the plastic easily scorches or separates out vapors, resulting in defects such as welded joints, poor surface quality. However, when producing thin-walled and complex parts, it is necessary to ensure a sufficiently high injection speed, otherwise it is difficult to fill.
Mold temperature: The mold temperature for ABS material is relatively high. Generally, about 75-85 ℃. When producing parts with a large size, the mold temperature requires 70-80 ℃. When injecting larger thin-walled parts, special heating of the mold need to be considered.
Back pressure: The commonly used back pressure is 5 bar. The higher back pressure is needed for the coloring material to make the color mixing even.
There are lots of injection molding material which you should know well about the, so that you can use them to make perfect plastic products. Lushi molding can give you more information about the injection molding manufacturing of abs plastic. Please contact us if you need any help.
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