How to determine if leather release paper is severely contaminated?

To determine whether leather release paper is severely contaminated, the following aspects can be considered: VISUAL INSPECTION Color change: Normal leather release paper is usually white or a specific light color. If there is obvious discoloration on the surface of the paper, such as yellowing, blackening, or color spots, it may be contaminated. For example, exposure to oils, chemicals, etc. may cause color changes. Stains and spots: Observe the surface of the paper for oil stains, ink stains, glue stains, and other stains, as well as for any unknown spots. These stains and spots may affect the release performance of release paper and the quality of leather. If the stain area is large or the spots are dense, it indicates that the pollution is severe. Foreign object attachment: Check whether there are dust, hair, fibers, and other foreign objects attached to the surface of the paper. A small amount of foreign matter can be removed by simple cleaning, but if it is present in large quantities and difficult to clean, it indicates that the release paper has been heavily contaminated. Odor identification: Normal leather release paper does not have any special odor. If you smell a pungent, putrid, or other abnormal odor, it may be due to the paper coming into contact with chemicals, organic solvents, or mold growth. This often indicates that the release paper has been contaminated to varying degrees, and the stronger the odor, the more severe the contamination may be.
performance testing
Release performance test: Conduct a small sample test on release paper to observe its release effect. If it is difficult to separate leather from release paper, or if there are residues on the surface of the leather after separation, it indicates that the release performance of the release paper has been affected, which may be caused by contamination. Severe pollution can lead to a significant decrease in release performance, which cannot meet production requirements. Physical performance testing: Conduct physical performance testing on release paper, such as tensile strength, tear strength, etc. If these performance indicators are significantly lower than normal levels, it may be due to the internal structure of the paper being damaged after contamination, thereby affecting its physical properties, indicating that the pollution is more severe. If the degree of contamination of leather release paper is still uncertain, samples can be sent to professional testing institutions for analysis and testing to obtain accurate results.