Plastic packaging bags, including three-side sealing bags , middle sealing bags, four-side sealing bags and many other styles, simply understand that the three-side sealing bag is to seal the three sides of the packaging bag, and to load things from the top sealing. The four-side sealing bag is a perfect product after passing through the production line, while the middle sealing bag encapsulates the plastic packaging from the middle. Below, Jiuzhi Plastics Network Xiaobian introduces the difference between the middle seal bag and the three-side seal bag.
1. Middle envelope
The middle sealing bag is also called the back sealing bag. Simply speaking, it is the packaging bag for sealing the back of the bag body. The application of the back sealing bag is very wide. Generally, the candy, the bagged instant noodles and the bagged dairy products are used. Class packaging form.
The packaging of rice is now much simpler and the packaging is in a variety of forms. Many rice bags are getting smaller and smaller, and the materials of the bags are getting more and more. We often use large bags and small vacuum bags. The use of vacuum bags to package rice is also constantly practiced and developed to finally position the vacuum bag packaging in the middle of the packaged rice. The use of medium-sealed bags to package rice, on the one hand, can guarantee the quality of rice and avoid the moisture of rice. On the other hand, the middle envelope packaging is not only small and convenient, but also the purchase and carrying of the customer is beautiful and generous. The weight of the rice in the middle envelope is generally 6 or 8 kilograms. The size of the middle envelope is just right for carrying.
The middle sealing bag can be used as a food bag, mainly used for product packaging, storing food, medicine, cosmetics, frozen food, etc., moisture proof, waterproof, insect proof, preventing things from scattering, can be reused, and will be tightly sealed with a single press. Strict, non-toxic and tasteless, good flexibility, easy to seal, very convenient.
2, triangular envelope
Triangular envelope airtightness Preferably, the bag is typically evacuated bag in this manner must. Triangular envelope in many cases require the use of vacuum-packed, this reason is very diverse, sometimes possible to prevent food spoilage, sometimes that is willing to make longer shelf life. Vacuum packing also commonly referred to reduced packaging, mainly air is withdrawn and then the entire packaging bag is sealed so that the bag has been in a highly reduced pressure state.
Moreover, the use of a low loss material trilateral packet, the aircraft using prefabricated bags, bags perfect pattern, sealing quality, resulting in improved product quality. Triangular envelope excellent sealing performance, high-barrier, moisture permeability ultra low oxygen, moisture corrosion fouling of radiation, mechanically strong, bright appearance and practical, non-toxic, odorless meet national standards.
At present, the best containers for packaging powdered and granular products such as fertilizers, pesticides, cement, grain, etc. are generally packaged in ordinary plastic woven bags and three-side sealed bags, which can hold about 20kg to 50kg, which is convenient. Handling, stacking, handling and storage features.
The production of the sealed bag and the three-side sealed bag are produced by different equipment, but there are also three-side sealing and medium-sealing mechanical equipment. Because of the different production steps between the two, there will be some differences in the use. However, there is a certain similarity between the two, that is, they are often used as packaging bags for food and other products.
Heshan Jasupi Sanitary Ware , https://www.jasupifaucets.com