1) The label punching size does not match the mold. If the label size is larger than the mold size, the label itself will have wrinkles when placed in the mold.
2) The label thickness is not enough. If the label is not thick enough, it is easy to wrinkle. Generally used for large products such as barrels, desktops, cabinets, etc., the recommended thickness is greater than 70 microns.
3) The label is not hard 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 weak 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.

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 and produce wrinkles.
3) Injection molding process problems. 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.