TPE|TPR material surface common printing process briefly - pad printing, screen printing and laser engraving

  • Time of issue:2023-03-20
  • Views:516

TPE|TPR material surface common printing process briefly - pad printing, screen printing and laser engraving

  • Categories:Elastomer knowledge
  • Author:SPP
  • Origin:en.tpe-sp.com
  • Time of issue:2023-03-20
  • Views:516

  TPE/TPR and other injection molded products are prone to dull surface finish, or uneven luster and color. I do not know how many TPE people are troubled, light polishing mold, increase the back pressure; heavy reformulation, adjust the system!

  (1) injection speed is too fast, the material stagnation time is too long will also cause the product surface gloss decline (mainly to produce flow lines or solution rupture)

  Solution: The injection speed should be reduced to reduce the retention time.

  (2) Poor thermal stability of the material, thermal decomposition (this should be better understood, but rarely occurs)

  Solution to the problem: Materials with good thermal stability and gloss should be selected or heat stabilizers should be added to the materials.

  (3) barrel temperature is low, the nozzle temperature is too low will also lead to a decline in the surface gloss of the product (and the fourth point is similar to the situation)

  Solution to the problem: The nozzle temperature should be raised and the melt temperature should be increased.

  (4) Mold temperature is too low, the cooling rate is too fast, when the melt is still filling the mold, a hard shell is formed on the cavity wall, the shell layer is subject to various forces, making it white and muddy, reducing the surface gloss of the product

  Solution: The surface temperature of the mold should be increased, the cooling rate should be reduced or local heating should be used at the mold gate.

  (5) Poor surface finish of the mold, so that the surface of the product is not glossy (polished mold, no discussion, try not to do the material with glass fiber)

  The solution of the problem should choose carbon tool steel and polish the surface of the mold carefully to improve the surface finish of the mold.

  (6) The use of too much amount of release agent will also make the surface of the products with such defects (too much release agent, material compatibility becomes poor)

  Solution to the problem: You should try not to use or use a small amount of release agent, and apply it evenly.

  (7) The back pressure is too small when plasticizing will make the material unevenly plasticized, and the material and coloring agent are not mixed well resulting in uneven color on the surface of the product (high-end problem, high-end solution)

  Problem solution: back pressure should be increased appropriately.

  (8) material mixed with impurities, not dry will also make the surface gloss of the product decreased (appear water lines)

  Problem solution: should think of removing impurities, fully dry the material, if necessary, additional hopper dryer.

  (9) runner, gate size is too small, poor exhaust will also cause the product surface gloss is not good (appear burnt)

  Solution: We should increase the size of runner and sprue, and add exhaust tank.

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