Plastic packaging bags are made of polypropylene (PP) as the main raw material, which is extruded, metal drawn, re-woven, woven, and made into packaging bags.
PP is a transparent, semi-crystalline thermosetting plastic with high toughness, good insulation properties, low water absorption, high ambient temperature, low relative density, and high glass temperature. It is the main raw material for making packaging bags. Modified filler materials usually include glass fibers, mineral filler materials, thermoplastic rubber, and the like.
The scope of application of plastic packaging bags is very wide. At this stage, the key applications of plastic packaging bags are the outer packaging of agricultural products, the outer packaging of plastic woven bags, food packaging materials, geological engineering, holiday tourism transportation, flood-fighting and emergency materials, etc. There are three main types of packaging bags: plastic packaging bags (film-free packaging bags), composite plastic packaging bags and various woven bags. The production process of plastic packaging bags is: woven bags become packaging bags after packaging and printing, laser cutting and sewing.
Depending on the machine and equipment used, it can be laser cut and then printed, or printed and then laser cut. The automatic laser cutting sewing machine can continue the process of packaging printing, laser cutting, sewing machine, etc., and can also be made into valve pockets, bottom pockets, etc. For flat looms, the center seam can be bonded and then the bag can be made. The production process of composite plastic packaging bags is to apply woven bags, composite stones or films for reconciliation or composite coating. The obtained rolls or sheets and rolls can be laser cut, packaged and printed and surgically stitched to make general seam bottom bags. They can also open holes, edge crimping, laser cutting, packaging printing, surgical stitching and plastic woven bags. The obtained sheet can be glued with seam, package printing, laser cutting, lid bonding and paste bag. It can also be welded, placed, crimped, made into wooden sheds and non-woven geotextiles. Flat looms can be repetitive or non-repetitive production and manufacturing, non-woven geotextiles, etc. The drum cloth can also be produced repeatedly or not.
The performance indicators of the plastic wire drawing machine production process are mainly divided into four categories:
1. Physical performance index value. There are mainly unit errors such as breaking force, relative breaking force, tensile strength, angular velocity, and density;
2. Index values of organic chemically modified materials. It mainly includes blending modified materials, mixing preparation, adding ratio of modifiers, and ratio of waste regenerated granular compound fertilizer;
3. Dimensional tolerance specification index value. It mainly includes the thickness of the plastic wire drawing machine and the width of the flat wire.
4. Physical properties rheological index value. There are mainly yarn splitting ratio, inflation ratio, draft ratio and shrinkage ratio;
Lined bag processing technology High pressure polyethylene material is heated by an extruder, melted and extruded smoothly;
Press the barrel-shaped plastic into a barrel-shaped plastic film; enter to reduce the blowing dust and cause tube bubbles;
The herringbone-shaped hair straightening splint is cooled and shaped by the cooling air ring, and the traction is brought into the conversion;
The drive system roller is drawn to the winding roller through the traction belt roller;
Finally, laser cutting is carried out, the lining bag is produced by the hot-melt process, and finally the fruit is bagged.
Pure polypropylene cannot meet the needs of plastic wire drawing machines, but it also needs to add a certain percentage of polyethylene, calcium bicarbonate and color masterbatch. Adding a small amount of polyethylene during the whole extrusion process can reduce the viscosity and melting rate of the material flow, improve the fluidity, improve the ductility and flexibility of the plastic wire drawing machine and plastic packaging bags, maintain a certain tensile strength, and improve the polypropylene ultra-low temperature damage.
Improved polypropylene additives can reduce temperature and working pressure in production and processing environments. Improve data flow and adhesion, improve tensile strength. The addition of calcium bicarbonate can change the shortcomings of complete transparency and opacity. In reducing stretch, the whole process is detrimental to electrostatic induction as it is detrimental to friction, improving printing ink adhesion for packaging and printing trademark logos, reducing natural collection and control costs of finished products during storage.
Post time: Jun-29-2022