（50） Uneven embossing Injection Molding Process Defect Handling Manual (65 types)

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(1) What is uneven embossing? (Uneven appearance embossing refers to the inability of the embossed patterns on the mold to be neatly copied onto the molded product.).
(2) Reasons for uneven embossing
(2-1) Insufficient pressure retaining
Uneven embossing is caused by insufficient pressure retention required to adhere the resin to the mold cavity. The conditions for maintaining pressure reduction are as follows:
(1) Low barrel temperature (including nozzles)
(2) Low mold temperature
(3) The gate is too small
(4) Slim diversion channel
(5) The pressure retaining setting is too low
(6) Low injection speed
(7) Low material fluidity
(2-2) Uneven embossing caused by other molding defects such as spray lines, poor gloss, dents, and other molding defects can also cause uneven embossing.
(3) Countermeasures for Uneven Embossing
(3-1) Increase holding pressure
First, try to increase the holding pressure. If this does not solve the problem, even if the output of the molding machine rises, it can be considered that the holding pressure is not effectively transmitted to the mold cavity. The following adjustments should be made at this time:
・ Increase barrel temperature (including nozzles)
・ Increase mold temperature
・ Increase injection speed
If this still does not work or does not work well, you need to change the mold or material