Plastic mold injection molded products have the reason of flow marks

Ⅰ, the main reason for flow marks

Is the material in the injection pressure and injection speed can not reach the material flow slows down caused by

Ⅱ, the impact of the mold on the flow marks

1、Temperature of mold surface is too low to produce flow marks.

2、Runner and gate size, number of influencing factors

3、Mold exhaust must be sufficient

Ⅲ, the impact of molding conditions molding conditions are mainly the following aspects of the impact:

1, the material tube temperature is too low, the melted plastic temperature is also low, the material mobility is reduced, in the direction of the flow is easy to form flow marks

2, the material cycle time is unreasonable, the material cycle time is too short will cause the melt temperature is low, filling the material fluidity deterioration, easy to flow marks.

3, the material in the material tube stay time is not enough, the material temperature will also be too low, the material is not easy to fill, will also form flow marks.

Ⅳ, Plastic mold injection molded products have flow marks solution

1, for the flow length is relatively large injection molded products, must choose good fluidity of the material, for the fluidity of the material does not meet the requirements can be added to the appropriate proportion of molding lubricant, improve the fluidity of the material. General lubricant content are under 1%, when the flow length of the mold wall thickness is larger, the lubricant content must be increased appropriately.

2, the injection pressure and holding time is not enough to condense the skin tightly pressed on the mold surface, leaving the melt in the flow direction of the flow marks. Response can be to increase the injection pressure and extend the holding time, the condensation layer can be tightly pressed on the mold surface, until the plastic mold or similar cement products mold shaping.

3, the injection cycle is too short, the plastic heating temperature is too low resulting in flow marks, you can lengthen the injection cycle time, sufficient to make the flow direction of the traces can not be produced as appropriate.

4, the barrel temperature is too low, the melt temperature is low, improve the material temperature, injection pressure and holding time will be condensing layer tightly pressed on the mold surface, until the plastic mold shaping.

5, the nozzle temperature is too low, resulting in a drop in material temperature to produce flow marks, improve the nozzle temperature can be, should be higher than the last setting of 6 degrees Celsius or more.

6, the main flow channel, manifold or gate is too small, resulting in increased resistance to flow, you can re-check and gradually increase the size of the pouring system.