The Classification and Process of Non-woven Bags are Different

2022-09-13 14:58:47 Kristal

Non-woven shopping bags are non-woven fabrics made of plastic. In reality, many people think that cloth is a natural material, but this is actually a misunderstanding.


Commonly used non-woven raw materials are polypropylene (referred to as PP and commonly known as polypropylene) or polyethylene terephthalate (referred to as PET and commonly known as polyester).

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The raw material of plastic bags is polyethylene. Although the two substances have similar names, they are very different in chemical structure. 

The chemical molecular structure of polyethylene is quite stable and extremely difficult to degrade, so it takes 300 years for plastic bags to be decomposed;

While the chemical structure of polypropylene is not strong, the molecular chain can be easily broken, so it can be effectively degraded. And enter the next environmental cycle in a non-toxic form, a non-woven shopping bag can be completely decomposed within 90 days.


In essence, polypropylene (PP) is a typical variety of plastics, and its pollution to the environment after disposal is only 10% of that of plastic bags.


The different production processes can be divided into:


1. Acupuncture: It is a kind of dry-laid non-woven fabric. Acupuncture non-woven fabrics use the puncturing effect of a needle to reinforce the fluffy fiber web into cloth.


2. Meltblown non-woven bag:

Its technical process: the polymer is put into the vessel and melted and extruded to form fibers. When the fibers cool, they form a web, which is finally consolidated into a cloth.


3. Heat-sealed non-woven bags:

This refers to adding fibrous or powdery hot-melt bonding to the fiber web to reinforce the material, and the fiber web is heated and melted and then cooled and consolidated into a cloth.

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4. Spunlace:

This is to spray a high-pressure fine water stream onto one or more layers of fiber webs so that the fibers are entangled with each other so that the fiber web can be reinforced and have a certain strength.


5. Spunbond non-woven bag:

After the polymer has been extruded and stretched to form continuous filaments, the filaments are laid into a net. The fiber web is then self-bonded, thermally bonded, chemically bonded, or mechanically reinforced to turn the fiber web into a non-woven fabric.


6. Wet-laid non-woven bags:

This is to open the fiber raw materials placed in the water medium into single fibers, and at the same time mix different fiber raw materials to make fiber suspension pulp, and the suspension pulp is transported to the web forming mechanism, and the fibers are formed into a web in a wet state and then reinforced into cloth.


7. Sewing:

This is a type of dry-laid nonwoven. The stitch binding method is to use the warp knitted loop structure to reinforce the web, yarn layer, non-woven material (such as plastic sheet, plastic thin metal foil, etc.), or their combination to make non-woven fabric.


8. Pulp airlaid non-woven bag:

This kind of bag can also be called dust-free paper and dry-laid non-woven fabric. It uses the air-laid technology to open the wood pulp fiberboard into a single fiber state, and then uses the air-laid method to condense the fibers on the web-forming curtain, and the fiber web is then reinforced into a cloth.

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