4. A conflict plate is arranged on one side of the ejection plate near the moving mold. The first sliding rod is fixably connected to the side of the conflict plate, and the conflict plate and the thimble cladding plate are connected by an elastic part.

(2) The injection capacity of injection molding machine is less than the weight of plastic parts. The injection molding machine with larger specifications should be used.

The injection molding process of plastic raw materials is mainly plasticizing, filling, cooling and shaping to become finished products. It is a process of heating and then cooling, and also the process of plastic changing from particles to different shapes. In this article, we will explain the PP injection molding process from the perspective of different stages and we present 11 common defects in Polypropylene injection molding.

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2. The side of the first fixing groove is sliding connected with a first sliding rod, and the center of the all changing module is rotating connected with the first sliding rod, and the first sliding rod is connected with the ejection plate

(4) Poor mold exhaust, residual air in the mold cavity caused under injection. The exhaust system of the mold should be improved.

5. An auxiliary ejector pin is arranged on the ejection plate, and the auxiliary ejector pin runs through the conflict plate and the first sliding rod in turn.

Plastic retyping depends on the mold or mold head. The injection molding product is three-dimensional, and the mold is more complex, and the shrinkage rate should be considered. Other products are flat, strip and needle like continuous product heads.

Good results and PP pyrolysis characteristics are that it is best to make the raw materials flow smoothly to the die head during production, so as to avoid the phenomenon of insufficient filling or reflux. Reflux represents that the flow rate of raw materials is faster than the output rate, and the average flow efficiency is increased, which is one of the available methods for processing, but it also causes abnormal MFR distribution, which may lead to instability The defect rate may increase.

Most of PP plastic injection molding processing depends on screw to drive the fluidity, so the design of screw has a great influence. The diameter of screw affects the output, the compression ratio affects the pressure value, and also affects the output and finished product effect, including the mixing effect of various materials. The flow of raw materials mainly depends on the heater, but the friction of raw materials will also produce friction heat energy to accelerate the fluidity, so the screw compression ratio is small, the flow is small, and the rotational speed must be increased, resulting in more friction heat than the screw with large compression ratio.

Most of the plastic machines are designed like syringes. The extrusion force driven by the screw will cause huge pressure at the small outlet and improve the production efficiency. When the mold head is designed as a plane, how to make the raw materials evenly distributed on the whole surface, the design of the hanger mold head is very important. Pay attention to the extrusion opportunity increases the fishgill pump to stabilize the raw material supply.

(3) When the silver streaks always appear in a certain position, it is necessary to check whether there are surface scars on the surface of the corresponding mold cavity. If there is a reflection of the surface scars, the surface scars of the die cavity should be removed by machining.

3. The side of the second fixed groove is sliding connected with a second sliding rod, and the center of the second switching module is rotating connected with the second sliding rod, and the second sliding rod is provided with a locking piece.

(3) The volatile content in the raw material is too high or the mold exhaust is poor. The volatile substances in the raw materials should be removed and the exhaust system of the mould should be improved.

(3) If the molding temperature is too high or the injection pressure is too low, the surface of the plastic parts will produce pores. The molding temperature should be reduced and the injection pressure should be increased.

(2) The structure design of the gating system is unreasonable. The structure of runner and gate should be improved to avoid turbulence during filling.

1. A pallet injection mold comprises a moving part and a fixing part. The moving part is provided with a ejection plate, and the ejection plate has ejection rods through the moving part. The moving part and the fixing part are respectively provided with a conflicting first switching module and the second switching module, the cross section of the first switching module and the second switching module are square. The first switching module and the second switching module four same sides are respectively provided with a forming block, The moving part and the fixing part have a first fixing groove and a second fixing groove for all the first switching module and the second switching module.

(1) When the size of runner and gate of thick wall plastic parts is small, it is easy to produce surface pores. The size of runner and gate should be enlarged properly.

Any raw material has the problem of shrinkage rate, which is caused by the internal stress caused by thermal expansion, cold contraction and crystallization. Generally speaking, thermal expansion and cold shrinkage are easy to overcome, which can be achieved by prolonging cooling time and maintaining pressure continuously. Crystalline raw materials tend to have larger shrinkage difference than non crystalline materials. PP is about 16% of 1000, but ABS is only about 4%. This part needs to be overcome in the mold or by adding additives to reduce shrinkage rate.

(1) Mold temperature is too high or insufficient cooling. The mold temperature should be reduced or the cooling time should be prolonged.

(4) When different kinds of resins are mixed, there will be silver streaks. Mixed use of different resins should be prevented.

The elongation of finished products can be enhanced by processing, and the molecular weight distribution will also affect the elongation effect in high-speed production. All extruded products, including fibers, have different elongation. Vacuum and air compression molding can also be regarded as another form of extension.

The pallet is a kind of plastic product that people use to carry goods in daily life and the factory to carry products. The pallet is mainly made by injection molding of the pallet injection mold, and the pallet needs to adapt to different handling conditions, and the structure will usually change slightly. In particular, there are many changes in the reinforcement ribs of the pallet. At present, people will re-make a mold according to each change, resulting in a greatly increased processing cost, and the pallet injection mold is relatively big size, leading to replacement the mold is very difficult.

In addition to pouring raw materials into runner gate, injection mold also has cooling channel cooling material design. Extrusion molding depends on the cooling channel in the roller to achieve the cooling effect, except for the air knife, cooling water directly poured on the blowing bag, and hollow air blowing and other cooling methods.

(6) The design of gating system is unreasonable. The filling performance of the gating system should be improved to make the melt flow smoothly in the mold cavity.

(2) Mold temperature is too low, barrel temperature is too high. The mold temperature should be increased properly to reduce the barrel temperature.

The heater of the unit makes the raw material particles melt into liquid flow gradually. It is mainly suitable to adjust the temperature of different raw materials. Increasing the temperature will accelerate the flow of raw materials, which can increase the efficiency, but it does not necessarily guarantee the yield. Therefore, a proper balance must be achieved.

(4) The wall thickness of plastic parts changes too much. The shape and structure of plastic parts should be designed reasonably to avoid rapid change of wall thickness.

(6) If the barrel temperature is too low, the injection pressure is insufficient or the injection time is too short, the under injection will also be caused. The control quantity of relevant process parameters should be increased accordingly.