Blister machineThe processing process of plastic raw materials is mainly the melting, flowing and cooling of colloidal particles into finished products after shaping. It is a process of heating and then cooling. It is also a process of changing plastic particles from different shapes. The following will explain the processing process from different stages.

1.Blister machinemelting

Device heater(Heater)Let the raw material particles gradually melt into a fluid flow, mainly with different raw materials suitable for temperature adjustment, increasing the temperature will tend to speed up the flow of raw materials, can increase efficiency but not necessarily guarantee the yield, must achieve a proper balance.

Another good effectPPIn case of high thermal cracking characteristics, it is best to make the raw materials smoothly flow to the die head during production, in order to avoid insufficient charging or reflux phenomenon, reflux represents the original.The material flow is faster than the output rate, which eventually results in an increase in the average flow efficiency equalMFRImprove, is one of the methods of processing can be used.

Blister machine tightening device

But it also causedMFRDistribution anomalies may lead to increased instability, resulting in a possible increase in non-performing rates. But...PPThe finished product is not a product with high size precision because of its application, so the impact is not great.

2.Suction machine screw

PPMost of the processing is driven by the screw fluidity, so the design of the screw is very large, the diameter size affects the output, the compression ratio affects the pressure value also affects the output and the effect of the finished product, which also includes the mixing effect of various materials.

The flow of raw materials mainly depends on the heater, but the friction of raw materials will also generate friction heat energy to accelerate the fluidity, so the screw compression ratio is small to drive the flow is small, and the rotation speed must be increased, resulting in more friction heat energy than the screw with larger compression ratio.

High-speed vacuum blister machine features

Therefore, it is often said that there is no master in plastic processing, and the person who understands the performance of the machine attentively is the master. The heating of raw materials is not only a heater, but also frictional heat and smothering time.

So this is a practical problem, and experience helps to solve production problems and efficiency. If the screw needs to have a particularly good mixing effect, sometimes two-stage different screws or two-shaft screws are designed and divided into different types of screws to achieve various mixing effects.

3.Blister machine mould or die head

The plastic reshaping of the blister machine depends on the mold or die head. The finished injection molding product is three-dimensional, and the mold is more complicated. The shrinkage rate should be considered. The other products are flat, strip-shaped and needle-shaped continuous die heads. If they are special shapes, they are classified as special shapes. Attention should be paid to the problem of immediate cooling and shaping.

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Most of the design of the blister machine is like an injection syringe, and the extrusion force driven by the screw will cause huge pressure on small exports and improve production efficiency. When the die head is designed as a plane, how to make the raw materials evenly distributed on the whole surface, the design of the hanger die head is very important, and the exquisite extrusion opportunity will increase the supply of fish gill pump to stabilize the raw materials.

4.Cooling

Injection mold in addition to the sprue gate pouring raw materials, there is also a cooling channel cooling raw material design. Extrusion molding relies on the cooling water channel in the roller to achieve cooling effect, except for air knives, cooling water directly poured on the blowing bag, and hollow blowing and other cooling methods.

Blister machine extension

Automatic vacuum blister machine

The reprocessing and extension of the finished product will enhance the effect. For example, the packing belt is driven by the front and rear rollers at different speeds, which will cause the extension effect. The tensile strength of the finished product alignment extension part is strengthened and not easy to tear, but it is extremely easy to tear horizontally.

Molecular weight distribution will also affect the extension effect of high-speed production, all extruded products including fibers have unequal extension, vacuum and air forming can also be regarded as another form of extension.

6.Blister machine shrinkage

Any raw material has a shrinkage rate.The cause of shrinkage comes from the internal stress generated during thermal expansion and cold contraction and crystallization formation. Generally speaking, thermal expansion and contraction are easier to overcome, can be processed to extend the cooling time, continuous pressure can be done, crystalline raw materials than non-crystalline often have greater shrinkage differences,.PPabout 16‰,ABSOnly about 4‰, the difference is very large. This part needs to be overcome on the mold, or additives to reduce the shrinkage rate are often added to overcome it, and the extrusion plate is also often added.LDPETo improve the problem of necking.

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