Better Touch Better Business
Contact Sales at CSSSLD.
Gas assisted injection molding
by：CSSSLD
2021-02-03
Add a certain amount of foaming agent, in some plastic internal low foaming were obtained through the processing of injection molding, surface not foaming plastic parts process known as low foam injection molding.
The characteristics of low foaming molding plastic parts is: the internal stress, external surface smooth, not easily occur sag and warp, skin is hard, has certain rigidity and intensity.
Internal flexibility, has certain elasticity, look like wood.
Small density, light weight, than the ordinary injection molding plastic parts to reduce 15%
50%.
Suitable for low foam injection molding of plastics polyethylene, polypropylene, polystyrene, polyamide, polycarbonate, ABS and so on.
the principle of gas assisted injection molding is relatively simple, namely in the injection molding process, to melt into lower than the injection pressure of low pressure gas, usually in the form of a few megabytes to even mpa, using the pressure of the gas pressure feeding. Above all when the gas assisted injection molding injection by the accurate measurement of the melt in the cavity within, and then the special nozzle in the melt injection gas, gas diffusion to promote the melt filled cavity. After molding, gas pressure in the melt was increased to remain unchanged or pressure to fill material, cooling gases in the back out of the plastic parts can be release.
gas assisted injection molding also has some shortcomings, such as the need to add air supply device and pneumatic nozzle, raise the cost of the equipment. When the gas assisted injection molding technology of the precision of injection molding machine and control system have certain requirements. On the surface of the plastic injection and injection gas can produce different luster. Low foamed plastics is refers to the foaming rate in 5 times the following, the density of 0. 2 - 1. 0g/cm³ Plastic, sometimes also called synthetic wood.
in gas assisted injection molding, melt the precise quantitative is very important. If injected into the melt is overmuch, can cause uneven thickness, on the other hand, if too little into the melt, the gas will melt molding can't be. Gas assisted injection molding as long as in the existing injection molding machine to increase a set of air supply device can be realized. According to the used abroad, gas assisted injection molding can be divided into standard displayed, melt reflux method and three kinds of activity core method.
standard features displayed in quantitative plastic melt filling into the mold cavity, and not full of cavity, the amount of plastic melt required should be determined through the experiment. Melt flow molding in first is the feature of injection molding of the plastics melt fills the cavity, with the standard difference is that the gas injection molding in, redundant melt flow cylinder injection molding machine. Gas plug injection molding to forming uneven wall thickness of plastic parts and complex three-dimensional hollow plastic parts.
the general method of injection molding for plastic parts wall thickness uniform as far as possible, otherwise the wall thickness in easy to produce the defects such as shrinkage cavity and depression. For thick wall plastic parts, in order to prevent depression, need time to strengthen the holding the loading, but if the part from the gate of thick wall far, even if too much pressure, also often work hard. At the same time, due to the large pressure maintaining pressure near the gate, the residual stress increased, so it's easy to cause deformation of plastic parts warp or crack. At present abroad adopt the new technology of gas assisted injection molding processing molding, better solved the uneven thickness of plastics and the injection molding of the hollow shell problems.
from sprue to flow end to form a continuous gas flow channel, no pressure loss, low pressure injection molding can be accomplished, thus can obtain low residual stress of plastic parts, plastic parts warp distortion is small, the size stability. Due to the effect of auxiliary mould filling of the air flow and improve the forming performance of plastic parts, so the gas assisted injection molding can help forming thin-walled parts, reduce the weight of the plastic parts. Due to the low injection pressure, can be in the clamping force of injection molding machine molding small size larger plastic parts.
more excellent articles: mould heating system, just click.
http://www。 csssld。 cn//html/2017/Info_0527/588。 HTML
nantong on suye's official website: http://www. csssld。 Cn / /
more wonderful articles, immediately search: changshu da plastic products factory smoothly
the principle of gas assisted injection molding is relatively simple, namely in the injection molding process, to melt into lower than the injection pressure of low pressure gas, usually in the form of a few megabytes to even mpa, using the pressure of the gas pressure feeding. Above all when the gas assisted injection molding injection by the accurate measurement of the melt in the cavity within, and then the special nozzle in the melt injection gas, gas diffusion to promote the melt filled cavity. After molding, gas pressure in the melt was increased to remain unchanged or pressure to fill material, cooling gases in the back out of the plastic parts can be release.
gas assisted injection molding also has some shortcomings, such as the need to add air supply device and pneumatic nozzle, raise the cost of the equipment. When the gas assisted injection molding technology of the precision of injection molding machine and control system have certain requirements. On the surface of the plastic injection and injection gas can produce different luster. Low foamed plastics is refers to the foaming rate in 5 times the following, the density of 0. 2 - 1. 0g/cm³ Plastic, sometimes also called synthetic wood.
in gas assisted injection molding, melt the precise quantitative is very important. If injected into the melt is overmuch, can cause uneven thickness, on the other hand, if too little into the melt, the gas will melt molding can't be. Gas assisted injection molding as long as in the existing injection molding machine to increase a set of air supply device can be realized. According to the used abroad, gas assisted injection molding can be divided into standard displayed, melt reflux method and three kinds of activity core method.
standard features displayed in quantitative plastic melt filling into the mold cavity, and not full of cavity, the amount of plastic melt required should be determined through the experiment. Melt flow molding in first is the feature of injection molding of the plastics melt fills the cavity, with the standard difference is that the gas injection molding in, redundant melt flow cylinder injection molding machine. Gas plug injection molding to forming uneven wall thickness of plastic parts and complex three-dimensional hollow plastic parts.
the general method of injection molding for plastic parts wall thickness uniform as far as possible, otherwise the wall thickness in easy to produce the defects such as shrinkage cavity and depression. For thick wall plastic parts, in order to prevent depression, need time to strengthen the holding the loading, but if the part from the gate of thick wall far, even if too much pressure, also often work hard. At the same time, due to the large pressure maintaining pressure near the gate, the residual stress increased, so it's easy to cause deformation of plastic parts warp or crack. At present abroad adopt the new technology of gas assisted injection molding processing molding, better solved the uneven thickness of plastics and the injection molding of the hollow shell problems.
from sprue to flow end to form a continuous gas flow channel, no pressure loss, low pressure injection molding can be accomplished, thus can obtain low residual stress of plastic parts, plastic parts warp distortion is small, the size stability. Due to the effect of auxiliary mould filling of the air flow and improve the forming performance of plastic parts, so the gas assisted injection molding can help forming thin-walled parts, reduce the weight of the plastic parts. Due to the low injection pressure, can be in the clamping force of injection molding machine molding small size larger plastic parts.
more excellent articles: mould heating system, just click.
http://www。 csssld。 cn//html/2017/Info_0527/588。 HTML
nantong on suye's official website: http://www. csssld。 Cn / /
more wonderful articles, immediately search: changshu da plastic products factory smoothly
Custom message
