(1) the appearance structure of the products is not complete.
If the temperature is low, the temperature of the cylinder should be raised.
If the pressure is insufficient or the time of maintaining pressure is small, it should be adjusted appropriately to observe the effect.
The injection amount is not enough, it may be that the outer diameter of the screw is worn seriously or the effect of the backstop valve is invalid.
The contact between the nozzle and the die liner is not good, resulting in a lot of overflow during injection.
The temperature of the nozzle part is low.
With low injection speed, the injection rate should be increased appropriately.
The low back pressure of the screw, the raw material plasticizing quality is not uniform.
The heating temperature of the mold is low or the temperature is not uniform, and the temperature difference is large. The heater should be checked for damage or proper temperature adjustment.
The problem of the flow of the molten material. Such as low flow temperature, small section size or rough surface.
The structure and size of the products are not reasonable, and some of them are too small.
(2) the appearance size of the product is not stable.
The injection pressure is small and should be increased appropriately.
Low pressure pressure or insufficient pressure time.
The temperature of the machine barrel is high and the temperature of the melting material is too high.
The low back pressure of the screw is not uniform and the screw back pressure should be improved.
The temperature of the mold is affected. The effect should be adjusted and observed properly, the mould temperature is high and the curing time is increased.
The nozzle aperture is small and should be increased appropriately.
The speed of the injection is slow, and it should be adjusted appropriately.
The amount of the injection is insufficient.
The position of the mold gate is not reasonable.
The design of the structure of the products is not reasonable and the local stress is unbalanced.
(3) the product is difficult to remove.
The injection pressure is high and the injection pressure should be reduced.
The high temperature of the molten material should lower the cylinder temperature or reduce the screw speed.
The raw material contains high moisture and should be dried.
The mold temperature is low or the temperature difference is large.
The surface roughness of the mold forming products is not enough, and it should be modified.
The cooling time is short, and the cooling time should be extended appropriately.
The coating amount of the mold is insufficient or the coating is not uniform.
(4) products have flying edges.
The two halves of the die are not tight or combined with rough surface, and should be repaired and improved.
The injection pressure is high and the injection pressure should be reduced appropriately.
The locking force is not enough, and the clamping force should be improved.
The temperature of the melting material is high, and the temperature should be reduced.
If the injection amount is too high, the injection time, material quantity or injection speed should be reduced.
The mold temperature should be reduced if the mold temperature is high.
(5) the product is liable to rupture when it is moulded.
The raw material plasticization is not even, should increase the screw back pressure appropriately.
The mold temperature is low, and the mold temperature should be increased.
It is necessary to find out the location of the broken part and adjust the working position of the ejector rod properly.
It is not enough to draw the mold of the products. The mould should be improved to increase the slant.
When the product is removed, the vacuum phenomenon or die structure is not reasonable, and the local stress concentration of the products should be re-designed and remoulded.
If the side slider is not coordinated with the open mode or the top out, the mould should be modified.
The surface roughness of the moulded mould should be redone to reduce the roughness of the molding surface.
The coating is uneven or insufficient.
(6) there are weld marks on the surface of the product.
The raw material plasticization is not even, should increase the screw back pressure.
The mold temperature is low and the mold temperature should be increased appropriately.
The injection pressure and low speed should be improved appropriately.
The hole diameter of the nozzle is small, and the diameter should be expanded to increase the unit time injection.
The flow path is small, and the flow rate should be increased.
The water content in the raw material is too high, and the raw material should be dried, so that the moisture content is less than that of the raw material.
(7) the surface of the product is corrugated.
It is necessary to raise the temperature of the cylinder and increase the back pressure of the screw.
If the mold temperature is low, the mold temperature should be increased or the temperature of each part should be balanced.
The quality of the product is affected by the injection pressure of the melt injection.
The curing time is short and should be extended appropriately.
The raw material contains too much moisture to dry the raw materials.
The speed of injection is not reasonable. It is important to note that the speed of injection is too fast or too slow.
The molding surface of the mold is rough and should be polished to reduce its roughness.
(8) products have bubbles or silver lines.
The raw material contains high moisture content, and the raw material should be dried and the water content is less than the allowable water content.
The additives in the raw materials are not high temperature resistant and should be replaced.
If the temperature of the machine cylinder is high or the material stays in the cylinder for too long, it should reduce the temperature in the front part of the machine tube or switch to the injection molding machine with a smaller size.
The screw back pressure is small, and the back pressure of the screw should be increased appropriately.
Low pressure pressure or low pressure protection time. The pressure should be increased to prolong the time of cooling.
The temperature of the mold is low and the mold temperature should be increased appropriately.
The injection pressure is too high and the injection pressure should be reduced.
The injection rate is too fast and the injection rate should be reduced.
(9) the surface gloss of products is not good.
It is necessary to raise the temperature of the cylinder and the back pressure of screw.
The water content in the raw material is high, and the raw material should be dried and the water content in the raw material should not exceed the allowable water content.
It is necessary to polish the surface of the cavity surface and improve the brightness of the cavity surface.
The addition of material in the raw material is improper, and the replacement should be adjusted.
The raw materials are not clean and have impurities.
The temperature of the mold is low and the mold temperature should be increased appropriately.
The melt runner and gate diameter of the molding die are small, the flow resistance of molten material is large, the mold exhaust is poor, and the mould should be modified.
(10) deformation of injection molding products.
The design of the product structure is not reasonable, the shape and thickness are not symmetrical, and the design should be improved.
If the curing time is short, the cooling time should be prolonged.
The temperature of each part of the mold is not uniform, the temperature difference is too large, the temperature control should be increased, and the temperature of each part should be even.
The working position of the ejector rod should be adjusted.
The location of the gate is not reasonable and the gate position should be changed appropriately.
The pressure and speed of the injection should be reduced appropriately.
(11) products have black or black stripes.
The machine drum is not clean, there is decomposing residual material, it is necessary to remove the cylinder, complete cleaning machine cylinder and the screw.
If there is impurities in the raw material, the raw material should be checked.
(3) nozzle aperture small, small gate aperture, high melting temperature, injection pressure, speed and other factors are likely to cause yellow or decomposed by high temperature melting, should adjust, observation of molten material forming quality, item by item, find out the cause of the problem.
There is a stagnant area in the inner or nozzle part of the machine, which causes the decomposition of the melting material, and the black spots or stripes appear. The cylinder and nozzle should be removed and the lagging area should be found, and the grinding should be carried out.
