How to perform bag inspection made of tarpaulin?

How to perform bag inspection made of tarpaulin?

When we perform bag inspection, we find that in recently year tarpaulin has become a popular material for bag, especially for thermal food bags or backpacks. As it is of easy wiping clean and waterproof quality, together with its low cost, tarpaulin will be more widely used in the bag industry. Therefore knowing how tarpaulin is produced is the first step of bag inspection which is made of it.

The way for bag inspection making tarpaulin:

1.Three main kinds of raw materials are necessary for tarpaulin, which includes Pvc powder/chips, plasticizer and stabilizer, plus some additives, go through high speed stirring with heat.
2. Plasticization of Banbury mixer (it decides the color of the material. And it depends on sequence of added materials, volume, temperature, speed of the machine, time of the reaction, pressure of the machine, type of the rotor and so on) ;
3. Go through filtering machine;
4. Go through calendar machine and become PVC film;
5. The two layers of pvc films are heated on laminating machine, the top and the bottom. There is another layer of mesh in the middle, and then through the high pressure of the laminating machine and become of final tarpaulin material.

The tarpaulin material will through finish product machine and be cut well and be rolled up in correct length. The tarpaulin material will go through finish product machine and be cut well and be rolled up in correct length.

So you will know the colour of tarpaulin is not the colour of mesh at all. It is the colour of PVC layer of top and bottom. Usually we call the shining layer top and the mesh grain layer bottom. We must keep this in mind during the bag inspection.

Should you have any questions, please feel free to contact us at abel@abelinspection.com.

Share this post