How to choose a correct material of kraft bag with window?

The method of selecting the kraft bag with window material is as follows:

1, surface material. For non-heat-sealable materials, consider the use of materials with good heat resistance and low thermal deformation, such as BOPA, BOPET, BOPP, and paper.

kraft bag with window

2, the inner material. Heat-sealing materials may be heat-sealed at 30°C lower than the surface layer’s heat distortion temperature. If the heat-deformation temperature of the surface layer material and the heat-seal layer material is too small, the temperature control of the bag making will be difficult because of the temperature. Lower, poor sealing fastness, not meet the requirements, in order to improve the sealing fastness, the temperature will increase, due to the thermal deformation temperature of the inner and outer materials is too small, easy to burn the surface material of kraft stand up pouches with window.

For the same type of heat seal material, the heat seal strength increases as the heat seal material thickness increases. Therefore, the material of the inner layer of the back-sealing bag and kraft bag with window should be 30 um or more. If the inner layer material is too thin, it will affect the sealing performance of the finished kraft stand up pouches with window bag product.

3, zipper. The zipper sealing strip with a lower heat-sealing temperature should be used, generally 5–10°C lower than the heat-sealing temperature of the inner layer material, such as the sealing temperature of the PE L-101 zipper sealing strip of Hot Pack Co., Ltd. Its PE LL-201 is about 10°C lower, which can be selected when different PE inner layer materials are bagged so as to achieve the best state of heat sealing with the inner layer material.

Hot Pack team can help to choose a best material for your kraft bag with window, we can help to find a best packaging solution to promote your product with your own brand.