1. Under the sunlight, the stripe-like pigment strip in the product needs to be considered from the aspects of plastic physical and mechanical properties and plastic molding process: 1. The temperature of the injection molding equipment is not well controlled, and the color master cannot enter the mixing chamber. Mix well with the resin. 2. The injection molding machine does not add a certain back pressure, and the screw mixing effect is not good. Increase the amount of storage in the barrel. 3. The dispersibility of the color masterbatch is not good or the resin is not plasticized. The process can be debugged as follows: 1. The temperature of the mixing chamber is slightly increased by the drop port portion. 2. Apply a certain back pressure to the injection molding machine. If it is still not good after the above debugging, it may be the dispersibility or matching problem of the color masterbatch and the resin, and should be solved by contacting the masterbatch manufacturing department.
2. After using a certain color masterbatch, the product appears to be more easily broken. This may be due to poor diffusion and miscibility caused by the poor quality of the dispersant or auxiliary agent selected by the manufacturer, which affects the physical and mechanical properties of the product.
3, according to the ratio on the color master specification, the color is too deep (too shallow) This problem is simple, but there are many possibilities, specifically: 1. The color master has not been tried carefully, the pigment is too little or too much 2. The measurement is inaccurate when used, and the phenomenon of random measurement by domestic enterprises, especially small and medium-sized enterprises, exists in large numbers. 3. There is a problem in the matching of color masterbatch and resin. This may be improper selection of carrier of color masterbatch, or it may be that manufacturers randomly change resin varieties. The machine temperature is not good, especially high, the color master stays in the machine for too long, causing the toner to burn off. Processing procedure: First check whether the resin type matches the color masterbatch, whether the metering is accurate, and then adjust the machine temperature or speed. If there is still a problem, contact the masterbatch manufacturer.
4, the same color masterbatch, resin and formula, why the color of the products injected by different injection molding machines? This is often caused by the injection molding machine. Different injection molding machines have different mechanical conditions due to different manufacturing, use time or maintenance conditions, especially the difference in the degree of adhesion between the heating element and the barrel, so that the dispersion state of the color master in the barrel is also different. A phenomenon will appear.
5. After changing the resin of another brand, the same color masterbatch and formula, the color has changed, why? Different grades of resin will have different density and melt index, so the properties of the resin will be different, and the compatibility with the masterbatch will be different, so that color change occurs. Generally speaking, as long as the density and melt index are not different. Large, then the difference in color will not be too large, you can correct the color by adjusting the amount of color masterbatch.
6. Does the phenomenon of pigment migration during the storage process affect the quality of the product? Some color masterbats have a high pigment content (or dye), and in this case, migration is normal. Especially the color masterbatch with dye added, serious migration will occur. However, this does not affect the quality of the product, because after the color master is injected into the product, the pigment is in a normal color development concentration in the product.
7. Why are some injection products not shiny? There are many possibilities: 1. The nozzle temperature of the injection molding machine is too low 2. The mold finish of the injection molding machine is not good 3. The molding cycle of the product is too long 4. The titanium dioxide contained in the color masterbatch is too much 5. The dispersion of the masterbatch is not good.
8. After a period of time, some plastic products will fade. 1. The quality of the pigment used is not good, or the toner is used improperly, and drift occurs. 2. The pigment has insufficient light fastness.
9. Why is ABS color master particularly prone to color differences? Different brands of ABS produced by different countries have large color difference. Even if the same brand of ABS, there may be chromatic aberration in each batch of batch numbers. Of course, color difference will also occur after coloring. This is due to the characteristics of ABS, and there is no thorough solution in the world. However, this color difference is generally not serious. Users must pay attention to this feature of ABS when using ABS color masterbatch.
10. Common disadvantages and solutions of polyethylene blow molding 1. The surface of the film is cloud-like. The reasons are: the color masterbatch has many fillers, the color masterbatch has poor dispersibility, the extrusion screw speed is too fast, and the extrusion screw temperature is too high or too low. The head temperature is too high or too low. Solution: Reduce the speed properly, adjust the temperature of the screw cooling water, and adjust the temperature of the head. Reduce the content of the color masterbatch filler and improve the pigment dispersion in the color masterbatch. 2. Causes of rupture of the bubble tube: There are impurities in the color masterbatch, there are pores in the color masterbatch, and the inorganic pigment in the color masterbatch is coked. Solution: Improve the fineness of the filter, strengthen the color masterbatch in the manufacturing process, strengthen the mixing, and press the vacuum to change the organic pigment. 3. Reasons for poor film flatness: The color masterbatch contains more fillers. Solution: Reduce the amount of filler in the color masterbatch. 4, film bag sealing is not good cause: the color masterbatch contains more wax. Solution: Reduce the wax content in the color masterbatch.
11. Common defects and solutions in the application of masterbatch in cast film 1. The cast film has a network structure. The pigment content is too high, the heat resistance of the pigment is not good, and the masterbatch has moisture. Solution: Appropriately reduce the temperature of each zone, the masterbatch needs to be dried, choose the pigment coloring intensity is high, choose the pigment with good heat resistance, strengthen the blowing, and appropriately raise the water temperature. 2, cast film hiding power is not good Cause: low titanium dioxide content in the film Solution: increase the amount of masterbatch, increase the content of titanium dioxide in the masterbatch, using R-type titanium white. 3. Causes of colored spots on the cast film: poor pigment dispersion. Solution: Select pigments with good dispersibility to enhance pigment grinding. 4. Causes of smoke during processing: Many volatiles in masterbatch Solution: Reduce the extrusion temperature and use high temperature dispersant.
12. Common disadvantages and solutions of color masterbatch in the application of blister sheet 1. The sheet is cloud-like. Cause: The color masterbatch is unevenly dispersed in the sheet, the processing temperature is low, and the temperature of the resin unit is too high. Solution: increase the temperature of the barrel, increase the temperature of the lip, reduce the temperature of the barrel, reduce the temperature of the lip, and improve the dispersibility of the masterbatch. 2. There are vertical stripes in the sheet. The raw materials or color masterbatch have impurities and impurities in the lip. Solution: Enhance filtering. 3. There are bubbles in the sheet. The raw material or masterbatch has moisture and the processing temperature is too high. Solution: Reduce the processing temperature, dry the raw materials and masterbatch.
13. Problems in color masterbatch in hollow molding applications and their solutions 1. Causes of chromatic aberration: poor dispersion of color masterbatch, insufficient blow molding air pressure, and poor heat resistance of color masterbatch. Solution: Increase the pressure of the gas source, appropriately lower the temperature of each zone, increase the color masterbatch carrier MI, and use a pigment with good heat resistance. 2, the cause of colored spots: color masterbatch dispersibility is not good, resin plasticization is not good. Solution: Improve the fineness of the filter, increase the molding temperature, and improve the pigment dispersion.
14. Problems in color masterbatch for molded foamed products and their solutions 1. Reasons for light color: low pigment content and poor heat resistance of pigments. Solution: Increase the pigment content of the masterbatch, and choose the pigment that meets the resistance of 180 Â° C for 30 min. 2. Causes of stomata: The pigment particles are large, the raw materials are impurities, the color masterbatch has impurities, and the carrier is incompatible. Solution: Check the raw materials one by one, improve the dispersibility of the pigment, strengthen the filtration in the manufacture of the masterbatch, and change the compatible resin. 3, the foam size is unstable Cause: pigment crystal structure Solution: increase the amount of foaming agent, increase the foaming temperature, and switch to a new pigment variety.
15. Problems caused by color masterbatch and its solution 1. Poor gloss causes: low temperature outside the nozzle, long molding cycle, more titanium dioxide in the color masterbatch, and poor pigment dispersion in the color masterbatch. Solution: Increase nozzle temperature and shorten molding cycle. Reduce the titanium dioxide in the color masterbatch and improve the pigment dispersion in the color masterbatch. 2. Causes of uneven color: The temperature of the material cylinder is high, the molding cycle is long, and the resin compatibility is not good. Solution: Reduce the temperature of the cylinder and use a carrier with good compatibility.
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