Raw materials for non-woven bags
Non woven bags are made of non-woven fabric as the raw material. Non woven fabric is a new generation of environmentally friendly materials that are moisture-proof, breathable, flexible, lightweight, non combustible, easy to decompose, non-toxic and non irritating, rich in color, low in price, and recyclable. This material can decompose naturally after being placed outdoors for 90 days, and has a service life of up to 5 years when placed indoors. When burned, it is non-toxic, odorless, and has no residual substances, thus not polluting the environment. It is internationally recognized as an environmentally friendly product for protecting the Earth’s ecology.
There are two main raw materials for non-woven bags, one is polypropylene (PP), and the other is polyethylene terephthalate (PET). Both of these materials are a type of non-woven fabric, formed by fibers through thermal bonding or mechanical reinforcement, with high strength and good waterproof performance.
Polypropylene (PP): This is a common non-woven fabric material with good light resistance, corrosion resistance, and tensile strength. Due to its asymmetric structure and easy aging and differentiation, non-woven bags can be oxidized and decomposed within 90 days.
Polyethylene terephthalate (PET): also known as polyester, this material’s non-woven bags are equally durable, but compared to polypropylene, its production cost is higher.
Classification of non-woven bags
1. The main material of non-woven bags is non-woven fabric. Non woven fabric is a type of non-woven fabric that is a new type of fiber product with soft, breathable, and flat structure formed by directly using high polymer chips, short fibers, or long fibers through various fiber mesh forming methods and consolidation techniques. Advantages: Non woven bags are cost-effective, environmentally friendly and practical, widely used, and have prominent advertising positions. Suitable for various business activities and exhibitions, it is an ideal advertising promotion gift for enterprises and institutions
2. The raw material for non-woven fabric is polypropylene, while the raw material for plastic bags is polyethylene. Although the two substances have similar names, their chemical structures are far apart. The chemical molecular structure of polyethylene has strong stability and is extremely difficult to degrade, so plastic bags take 300 years to decompose completely; However, the chemical structure of polypropylene is not strong, and the molecular chains can easily break, which can effectively degrade and enter the next environmental cycle in a non-toxic form. A non-woven bag can be completely decomposed within 90 days.
According to different production processes, it can be divided into
1. Spinning: It is the process of spraying high-pressure fine water onto one or more layers of fiber mesh, causing the fibers to intertwine and strengthen the mesh to a certain degree of strength.
2. Heat sealed non-woven fabric bag: refers to adding fibrous or powdered hot melt adhesive reinforcement material to the fiber mesh, and then heating, melting, and cooling the fiber mesh to reinforce it into a cloth.
3. Pulp airflow net non-woven fabric bag: also known as dust-free paper or dry papermaking non-woven fabric. It uses airflow mesh technology to loosen the wood pulp fiberboard into a single fiber state, and then uses airflow method to aggregate the fibers on the mesh curtain, and the fiber mesh is reinforced. 4. Wet non-woven fabric bag: It is a process of loosening fiber raw materials placed in a water medium into single fibers, and mixing different fiber raw materials to form a fiber suspension slurry. The suspension slurry is transported to a web forming mechanism, and the fibers are then reinforced into a cloth in a wet state.
5. Spin bonded non-woven fabric bag: It is a process where the polymer has been extruded and stretched to form a continuous filament, which is then laid into a web. The web is then self bonded, thermally bonded, chemically bonded, or mechanically reinforced to transform into non-woven fabric.
6. Melt blown non-woven fabric bag: Its process includes polymer feeding – melt extrusion – fiber formation – fiber cooling – mesh formation – reinforcement into fabric.
7. Acupuncture: It is a type of dry non-woven fabric that uses the puncture effect of a needle to reinforce a fluffy fiber mesh into a fabric.
8. Stitch weaving: It is a type of dry process non-woven fabric that uses a warp knitted coil structure to weave fibers, yarn layers, non-woven materials (such as plastic sheets, plastic thin metal foils, etc.) or their groups
Post time: Mar-10-2024