The raw materials do not meet the requirements for use

In addition, the colorant is easy to float in the air, deposit in the hopper and other parts, contaminate the mold of the injection machine, and cause uneven color of the plastic bag. When coking molten material accumulates at the barrel or nozzle, the barrel and nozzle should be sorted out, check whether the nozzle tip is aligned with the sprue sleeve, and appropriately lower the nozzle temperature.

The raw materials do not meet the requirements for use.Unreasonable molding conditions The uneven color near the feed inlet or the welding part is generally caused by uneven distribution of the colorant or the nature of the colorant does not meet the requirements for use. 

Therefore, when selecting colorants, they should be carefully selected according to the process conditions and the color requirements of the plastic parts, especially for the more important indicators such as heat resistance temperature and dispersion characteristics, which must meet the main art requirements; the use of colorants should be wet mixed the way.The performance of plastic vest bag coloring agent is directly related to the color quality of plastic parts after molding.　　 

If the entire plastic part is discolored or uneven, China hand stretch film it is often related to the molding process conditions. For the above troubleshooting methods, one is to remove foreign matter in the raw materials, purify the raw materials, and pre-dry the raw materials to reduce the moisture in the raw materials; the second is to improve the process parameters to improve the distribution of fibers in the resin and minimize the lubricant