Tel: +86 188 2689 9458
source:Industry News release time:2022-11-11 Hits:

Visual inspection of appearance includes inspection of flatness and transparency of vacuum bag. It is mainly used to detect whether there are obvious scratches and pinholes on the surface, and whether there is pollution at the seal. The appearance inspection methods are as follows:
1: Vacuum bag surface wiredrawing "inspection. Place the vacuum packaging bag in the center of your hand, aim at the 40w fluorescent lamp, and gently shake it. Through the reflected light on the surface of the composite bag, you can clearly find whether there are scratches or marks on the surface of the vacuum packaging bag, which is often called "bag surface wiredrawing" in the industry. The wire drawing phenomenon is mostly caused by the unclean traction guide roller of the bag making machine, so it must be ensured that the guide roller is clean. In addition, if the guide roller does not rotate, it will also cause drawing failure of the vacuum packaging bag.
2: Check the flatness of the vacuum bag. Place the vacuum bag on a flat table. If the surface is bent, warped outwards or arched inwards, the flatness is poor,
Otherwise, it indicates good flatness. The reasons for poor flatness are generally as follows: high bag making temperature has damaged the stress stiffness of the inner layer of the composite bag; Unreasonable structure composition; The material itself is uneven in thickness.
3: Check the transparency of the vacuum bag. Transparency is particularly important for some products because there is no pattern on a large area. The transparency test method is: take a finished bag and observe it through the indoor indirect light source. If there are "pockmarks", "rings", "fog" and other phenomena in the blank, it indicates poor transparency, otherwise it indicates good transparency.
Read recommendations:
Custom printed food grade ziplock snack custom plastic pouch packaging food packing bag
Popular recommendation
PET food bag
Spout pouch
Pouch with handle
eco friendly spout pouches Vendor
clear spout pouch price
coffee grinds pouch wholesale
kraft paper spout pouch wholesale
Spout pouch flexibility
Pouch with handle wholesale
pouch with handle supplier
Requirements for fertilizer packaging bags.
Food packaging bags have chemical hazards
What are the benefits of vacuum rice packaging?
coffee bag with one way valve distributors.The thickness of each layer of the composite packaging ba
How to deal with the discoloration of food packaging bags?
Be careful when purchasing vacuum packaged food
Do you know these characteristics of the bag in the box?
PET food bag wholesaler.What requirements should food packaging bags meet
aluminium spout pouch Factory.Lightweight heat preservation, Spout pouch accompanying
How are the bags classified?
Reasons for Aging of Food Packaging Bags and Preservation Techniques
The characteristics and application of composite packaging bag
Analysis of food vacuum bag
smart food snack bags Solution.Understand the thickness of food packaging bags
How to use nylon vacuum bag
The cause of Vacuum Zipper Bag leak.vacuum zipper bags company
What are the advantages of octagonal sealed packaging bags.bag in box 3L,5L,10L
How important is the design of rice packaging bags? You'll know when you see it
The quality of sterile liquid packaging bags is affected by the following factors.spout pouch manufa
What is the barcode on the product packaging bag.recyclable spout pouches wholesaler