How Is The Appearance of The Vacuum Bag Detected?

Appearance visual inspection includes checks of vacuum bag flatness, transparency, etc. Mainly used to detect the surface for obvious bruises and pinholes, seals there is no pollution. The appearance check method is as follows:

Vacuum bag bag surface silk" check. Place the vacuum bag in the center of the hand, aimed at the 40w fluorescent lamp gently shaking, through the reflected light on the surface of the composite bag, you can clearly find whether the surface of the vacuum bag scratches or marks, the industry is often referred to as "bag surface drawing." The phenomenon of pulling is mostly caused by the bag-making machine guide roller is not clean, so it is necessary to ensure that the guide roller is clean. In addition, the roller does not turn the same vacuum bag will cause a wire failure.

A check of the flatness of the vacuum bag. Place the vacuum bag individually on a flat tabletop, and if the surface is bent, tilted outwards or arched inwards, the flatness is poor, whereas the flatness is good. The reasons for the difference in flatness are generally the following: the bag temperature is high, has destroyed the stress stiffness of the inner layer of the composite bag; The structure is unreasonable; The material itself is unevenly thin and thick.

Check the transparency of the vacuum bag. Transparency is particularly important because of the large area without patterns. Transparency detection method is: extract a finished bag, through the indoor indirect light source observation, if there are "hemp dot", "ring", "fog" and other phenomena in the blank, it indicates poor transparency, the opposite indicates good transparency.