Abs Plastic Processing And Detailed Analysis Of Process
ABS known as acrylonitrile butadiene styrene is determined by acrylonitrile - butadiene - styrene three kinds of monomers formed
. As the ratio of three different monomers may have different properties and melting temperature, flow properties of ABS plastic or additives, such as blending with other even more can be extended to different uses and performance of ABS, such as resistance to impact grade, heat-resistant grade , flame retardant grade, transparent level, enhance the grade, electroplating grade and so on.
ABS between mobility between the PS and the PC, its mobility and the injection temperature and pressure have a relationship, in which the impact of injection pressure is slightly larger, so forming a higher injection pressure is often used to reduce the melt viscosity and improve charge mode performance.
1,
plastic recycling machinery processing
ABS water absorption of about 0.2% -0.8%, for the general level of ABS, with the processing of pre-bake oven 2-4 hours to 80-85 or 80 drying hopper to bake 1-2 hours. PC-containing components of the heat-resistant grade ABS, proper drying temperature raised to 100 , a specific drying time can be used to determine the air squeezed out.
The proportion of recycled materials used does not exceed 30%, plating grade ABS can not use recycled materials.
2, injection molding machine selection
Ramada can choose the standard injection molding machine (screw 20:1 aspect ratio, compression ratio is greater than 2, injection pressure is greater than 1500bar). If the use of master batch material with high demand or product appearance may make use of the small diameter of a screw. 4700-6200t/m2 to determine the clamping force according to the specific grade and products must be in accordance
plastic recycling machine request.
3, mold and gate design
Mold temperature can be set to 60-65 . Flow channel diameter 6-8mm. Gate width of 3mm, thickness and products, as the gate length is less than 1mm. Vent width 4-6mm, thickness 0.025-0.05mm.
4, melt glue temperature
Air injection can be accurately determined. A different level of adhesive melting temperature is also different, it is recommended to set as follows:
Anti-impact grade: 220 -260 , in order to better 250
Electroplating Grade: 250 -275 , in order to better 270
Heat Level: 240 -280 , in order to better 265 -270
Flame Retardant: 200 -240 , in order to better 220 -230
Transparency Level: 230 -260 , in order to 245 is better.
Glass fiber reinforced grade: 230 -270
High requirements for surface products, use of the higher melting temperature and mold temperature glue.
5, injection speed
Fire-rated to use a slow, heat-resistant grade with quick. Such as the product surface are higher, and it will need high-speed and multi-stage injection
Blow Moulding Machine of the rate of fire control.
6, back pressure
Under normal circumstances back pressure as low as possible, a common back pressure is 5bar, coloring need to use a higher back pressure in order to blend evenly.
7, retention time
At 265 in temperature, ABS plastic barrel in the melt residence time of a maximum of 5-6 minutes. Flame-retardant shorter, and if shut down, we should, first set the temperature as low as 100 , then general purpose grade ABS plastic tube cleaning melt. Clean-up after the mixture should be placed in cold water to prevent further decomposition.For reform to play from other ABS plastic material, then the first with the PS, PMMA or PE melt glue tube cleaning. Some of ABS products in just stripping no problem when, over a period of time before there will be discoloration, which may be overheating or plastic in the molten
plastic recycling machinery tube to stay too long due.
8, products, post-processing
ABS products generally do not need post-processing, only the plating grade products subject to baking (70-80 ,2-4 hours) in order to trace the surface passivation, and the need to electroplating products can not use the release agent, product packaging immediately after taking out .
9, forming special attention when
There are several grades of ABS (in particular, flame retardant grade), after the melt in the plasticizing screw surface adhesion of the great break after a long time. When the above situation, we need to segment and compression screw were pulled out of smear, and on a regular basis with the PS and other clean-up screw.
source:
bxkm news by: wenjun
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