3) The hardness is not enough, or the density of the material inside the film is not enough. Insufficient hardness or density of the label causes the label itself to be not strong enough and prone to wrinkles.
4) The label and mold are not perfectly combined during the injection molding process. The label was not placed in the correct position causing wrinkles during the injection molding process.
5) Material selection issues: The material and thickness of the label itself will also affect the wrinkles during the injection molding process. If the selected label material is not suitable for the injection molding process or is too thick, it may cause wrinkles.

Analysis from the injection molding process:
1) Improper temperature: If the temperature during the injection molding process is inappropriate, such as too high or too low, it will cause the label to wrinkle during the injection molding process.
2) Uneven pressure: If the pressure distribution of the injection molding machine is uneven, it will cause uneven pressure during label injection, which will lead to wrinkles.
3) Injection molding process issues: The setting of injection molding process parameters will also affect the quality of label injection molding. If the injection speed is too fast or too slow, the pressure and temperature of the injection molding machine are inappropriate, etc., wrinkles may occur.