Ziplock Bag Sealing Method
Food storage, caused decay of contents for many reasons. Among them, the most common cause is thin-film barrier properties and the poorly sealed Ziplock bag; the former, need to be fully taken into account when designing a Ziplock bag each layer of material properties, thickness, to get a sufficient barrier properties. Here, we talk about the sealed Ziplock bag.
Sealing the so-called, refers to software packages to prevent other substances enter the temperature of contents or attributes. In a Ziplock bag in the production process, as the production more, may result in leakage of heat sealing, pressure worn or cracking of the material itself, porous, and the formation of internal connecting holes or weak points. These will have a negative impact on package contents, directly affects the quality of the product. Especially small holes, causing part of contents directly exposed to the air, lost the meaning of a Ziplock bag to protect the product. Also in circulation and marketing aspects of products, will be subject to pressure, impact damage, may result in Ziplock bag sealing performance, and even cracking.
Test can effectively comparison and evaluation of soft packing seal technology and seal! in order to determine the relevant specifications to provide a scientific basis.
Common Leakage Test methods
1. water-soaked method
Ziplock bag is usually applied in the presence of water, outer material performance testing can dramatically reduce packaging, outer packaging of paper materials.
Sample fill test fluid (such as filter paper clear color colored aqueous solution), the seal placed on filter paper after sample, observe leak testing liquid samples from the inside out. Both sides should be measured.
These methods can also be placed in the vacuum chamber, in a State of negative pressure tests.
2. vacuum method
Ziplock bag material above. Empty vacuum for vacuum, pressure difference of the sample observed shape recovery of the sample after sample expansion and release the vacuum in order to determine the sealing properties of the sample.