1. Striped pigment strips in the product under sunlight
This problem needs to be considered from two aspects: 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 be thoroughly mixed with the resin after entering the mixing chamber. 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 susceptible to cracking
2O8H$R%x1o+Y&L$u This may be due to poor diffusion and miscibility caused by the poor quality of the dispersant or additive selected by the manufacturer, which affects the physical and mechanical properties of the product.
3. After using the ratio on the color master specification, the color is too dark (too light)
4B)]1W!V'Y This question is simple, but there are many possibilities, specifically: 1. The color master has not been carefully tested, the pigment is too little or too much. 2. The measurement is inaccurate when used, especially for domestic enterprises. There are a lot of phenomena in which SMEs are arbitrarily measured. 3. There is a problem in the matching of color masterbatch and resin. This may be the improper choice of the carrier of the masterbatch, or it may be that the manufacturer randomly changes the resin type. 4. The temperature of the machine is improper, especially the high color. The mother stayed in the machine for too long, causing the toner to burn out. 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? 3C7X7M$N&?8^0r
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.
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 the aBS color master particularly prone to color differences? +a,I7[-g;M
Different brands produced by different countries have a large color difference. Even if the same brand of aBS, there may be chromatic aberration in each batch of batches. 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 master.
10, polyethylene blow molding common ills and solutions
1) The surface of the film is cloudy. The reasons are: the color masterbatch has many fillers, the color masterbatch has poor dispersibility, the extrusion screw speed is too fast, the extrusion screw temperature is too high or too low, and 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 bubble tube rupture: 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), the reason for the film flatness difference: 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 of masterbatch in cast film application
1) The casting film has a mesh structure. The reason is that the pigment content is too high, the heat resistance of the pigment is not good, and the masterbatch has moisture. Solution: a. 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. b. The masking force of the cast film is not good. The reason is that the titanium dioxide content in the film is low. Solution: increase the amount of masterbatch and increase the content of titanium dioxide in the masterbatch, using R-type titanium white. c. Causes of colored spots on the cast film: Poor dispersion of pigments Solution: Select pigments with good dispersibility to enhance pigment grinding. 4), there are reasons for the smoke during processing: more volatiles in the masterbatch solution: reduce the extrusion temperature, select high temperature dispersant.
12. Common disadvantages and solutions of color masterbatch in the application of plastic sheet
a. The sheet is cloud-like. The color masterbatch is unevenly dispersed in the sheet, the processing temperature is low, and the resin temperature 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. b. The reason for the longitudinal streaks of the sheet is that the raw material or color masterbatch has impurities and impurities in the lip. Solution: Enhance filtering. c. 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. The problems of the color masterbatch in the hollow molding application and the solution thereof are caused by the color difference: the color masterbatch is not well dispersed, the blown air pressure is insufficient, and the color masterbatch has poor heat resistance. 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) The reason for the light color is low: the pigment content is low, and the heat resistance of the pigment is not good. Solution: Increase the pigment content of the masterbatch, and choose the pigment that meets the resistance of 180 ° 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 foaming size is unstable Cause: The pigment crystal structure solution: increase the amount of foaming agent, increase the foaming temperature, and switch to a new pigment variety.
15. The problem of color injection caused by injection molding and its solution
1), the gloss is not good Cause: The temperature outside the nozzle is low, the molding cycle is long, the titanium dioxide in the masterbatch is more, and the pigment dispersion in the masterbatch is poor. 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), uneven color causes: high temperature of the cylinder, long molding cycle and poor resin compatibility. Solution: Reduce the temperature of the cylinder and use a carrier with good compatibility.
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