1. Dust

Dust is a type of fine particle suspended in the air. It has strong buoyancy and easily adheres to surfaces. In fact, dust is the number-one enemy of heat-transfer molds. Once dust settles on the mold surface, it becomes embedded during printing, resulting in incomplete patterns that may show signs of damage and dirtiness.

2. Oil Stain

Oil stains are a phenomenon caused by the accumulation of grease. The causes of oil stains in heat-transfer molds can be categorized into three points:

(1) During the cutting process, the adhesive inside the mold accidentally came into contact with the machine's rolling lubricating oil;

(2) Oil contamination accidentally polluted the surface of the mold adhesive near the storage area;

(3) The substrate surface is not clean and still has oil residues. If workshop personnel fail to notice this, the surface of the injection-molded products will develop stains.

Whether in production or processing practice, operators must remain cautious and carefully inspect check points at each stage—such as cutting, storage, and machining—before selecting greasy flowers and products. Wipe them clean with a cloth. If they cannot be properly cleaned, it is recommended to treat them as scrap.

3. Increase static electricity

Although many factors need to be considered when performing in-mold labeling, a key consideration is how to position the in-mold label correctly within the injection mold. To address this issue, electrostatics offer an excellent solution. Using static electricity during the in-mold labeling process provides advantages in terms of both cost and reliability, as it eliminates the need for vacuum systems in the mold.

Source: Jiangmen Film Lamination Manufacturer http://www.walshchina.com/