Differences among Ziplock, Envelope, Chain Clip, Zipper and Express Bag

Many people often can't distinguish between ziplock bags, envelope bags, chain clip bags, zipper bags, and express bags. Today, let's talk about their differences.

Ziplock bag

As the name suggests, it can be sealed by itself. According to the name, envelope bag, chain clip bag, and express bag can be regarded as a frosted matte pvc ziplock bag, but in fact, ziplock bag is a single bag name in the industry.

The frosted matte pvc ziplock bag is made by blowing a bone strip directly at the mouth of the bag when the film is blown by the machine, which is used for sealing the bag. The frosted matte pvc ziplock bag is made of LDPE, which can be added with anti-static materials. The printing is relatively simple.

It is generally used to pack electronic products, powders, gifts, jewelry, documents, fruits, specialty products (such as some small candy), and other related products. The distance between the seal and the top of the bag is 1.8cm, so when reporting the size, it is generally necessary to indicate whether it is the inner side or the outer size.

Envelope bag

According to the name, the envelope bag means a bag like an envelope. Those who have sent letters to the post office know that the envelope has a tongue. When sending letters, they should be coated with a layer of paste, to turn the tongue over and stick to the letter sealing mouth to prevent the loss of contents.

Therefore, plastic bags also refer to this method to produce envelope bags of different materials. Express bags belong to the scope of envelope bags, but express bags are separately distinguished in the general industry. We generally refer to OPP envelope bags, LDPE envelope bags, HDPE envelope bags, CPP envelope bags, etc.

Clip chain bag

A chain clip bag is the most easily confused with a self-sealing bag because the sealing method is very similar. A chain clip bag is also called a bone stick bag, which is stuck on the bag by a chain clip. The material of the chain clip bag can be CPP material, PPE material, and LDPE material. Generally, LDPE material is the most commonly used.

The difference between a chain clip bag and a self-sealing bag: the chain clip bag is pasted on the bag by two chain clips when making the bag, and there is a large indentation on both sides of the bag (there is a PPE chain clip, but there is no indentation. If you don't look carefully, it looks like a self-sealing bag). It is not blown out by the film, but processed in the later stage. The distance between the sealing part of the chain clip bag and the top of the bag can be arbitrarily specified. The chain clip bag can be printed with rich patterns and colors and can be made into bags with different processes, such as hook bags, punching handbags, composite bags, self-supporting bags, etc. Chain clip bags have a wide range of applications and can be used for clothing, fruits, daily necessities, electronics, powder, and other commodities.

Zipper bag

Hot sale PVC zipper bags and chain clip bags are sometimes easily confused. Generally, composite chain clip bags are sometimes called hot sale PVC zipper bags, while hot sale PVC zipper bags in PE, PVC, and CPE single materials refer to bags with zipper caps.

Express bag

As mentioned above, the express bag belongs to the scope of the envelope bag. Because the express bag meets the definition of an envelope bag, it is listed separately because the express bag is specially used in the logistics industry, and e-commerce and express companies are the most common.

Express bags generally use multi-layer coextrusion materials with a thickness of 0.06-0.07mm. They use destructive adhesive or hot melt adhesive with strong destructive power. Once they are stuck, they will be broken, rotten, or deformed if they are torn open after a while. Therefore, many Taobao stores and small mall merchants make their personalized express bags. During the transportation of products, Others can't replace the items in the package (there are often cases of couriers transferring packages), to protect the good products of regular and honest merchants from reaching customers.

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