During the production process of woven bags, sometimes there will be open threads, which will bring bad experience to both packaging and products. The manufacturer of plastic woven bags introduces that when sewing plastic woven bags, the needle guides the upper thread through the bag. After reaching the lower limit position, it advances upwards. Because of the friction between the sewing material and the suture, the upper thread cannot be stitched randomly. Advance synchronously, but stay under the sewing material, and under the effect of elasticity, it will form a loop on both sides of the needle.
Then the hook tip of the hook reaches the machine needle during the movement, so that the thread loop passes through, and during continuous rotation, the hooked thread loop is expanded, and when it is wound to its own radius, it crosses the expanded thread loop, Then the thread take-up lever takes up the thread, and the feed dog feeds the material. In order to make these actions smooth and uninterrupted, the hook continues to rotate at the original speed for one circle, instead of idling for one circle after hooking the thread. After the needle reaches the upper limit position, when the thread is led downward again , Plastic woven bag sewing machine such a cycle, can solve the above problems.
According to the classification of materials, plastic woven bags are very easy to distinguish. One is polypropylene woven bags and the other is polyethylene woven bags. The two plastic woven bags of different materials have different directions and uses, and Z is Polypropylene woven bags are mostly used. The raw materials of woven bags are subjected to some small processes before bag making, and a seemingly small but very critical step is the wire drawing process.
Although it seems simple, the quality of the wire drawing directly affects and determines the quality of the pulling force of the plastic woven bag. The field exposure test of woven bags takes a long time and requires a lot of manpower and financial resources, but the experimental data obtained basically meet the actual use requirements and can be used for the anti-aging quality evaluation and anti-aging effect monitoring of woven bags.
For woven bags, it is important to eliminate static electricity generated during the production process. After all, woven bags are a kind of plastic product. If the static electricity is not eliminated effectively, it may cause important problems such as fire. Before making plastic woven bags, a drawing process is necessary.
Because only by spinning the plastic first, can the woven bag be made on the circular loom. Plastic woven bags are composed of polypropylene bags and polyethylene bags according to the main materials; according to the sewing method, they are divided into seamed bottom bags and seamed bottom bags. At present, it is widely used as a packaging material for fertilizers, chemical products and other items.
Post time: Nov-30-2022