Process overview of the hottest plastic woven bag

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Process overview of plastic woven bags

1 Plastic woven bag flat yarn process

the production process of plastic flat yarn is a process engineering in which the raw materials and auxiliary materials are mixed, and then it is melted and extruded into a film by the extruder. The film is cooled, divided into filaments (gray filaments), and then stretched and oriented to produce flat filaments. Finally, these flat filaments are wound on the bobbin, made into spindles and sent to the knitting process to produce woven cloth

the technological process of producing split film wire is basically the same as that of producing flat wire. Only after dividing into strips (blank wire), add one. 2. Whether clamping is a reliable binding process

polypropylene (PP) is the main raw material for producing flat filament or split film filament, and sometimes high-density polyethylene (HDPE), linear low-density polyethylene (LLDPE) or their blends are used

the auxiliary raw materials for the production of flat silk are mainly masterbatches (calcium fillers), colorants (color masterbatches) and other modifiers, such as antioxidants, lubricants, etc

the main equipment for producing flat wire or split film wire is drawing machine, winding machine, auxiliary equipment is mixing machine, waste recycling equipment, etc

the production process of flat wire or split film wire is the most critical and complex process in plastic weaving process. Its main process indicators include: extruder temperature and pressure, flow control, cooling, stretching, heat treatment (shaping) temperature control, flat wire drafting ratio, relative breaking force, elongation at break control, output, energy consumption, output ratio, etc

2. Knitting process of plastic woven bags

the process of producing woven cloth from flat silk is to interlace the warp and weft of flat silk into cloth For the barrel cloth, it is woven with a circular loom. There are many spindles on the warp frame of the circular loom. According to the width of the woven cloth and the width of the flat yarn, a specified number of warp yarns are used Before the warp enters the circular loom, the warp is cross opened by the brown frame of the warp, and the weft shuttle makes a circular motion through the warp in the cross opening to weave into a barrel cloth

a circular loom has several shuttles, and several weft yarns are woven at the same time For plain cloth, it can be woven by flat loom, projectile loom and water jet loom

if the warp yarn is changed to split film yarn, double yarn and folded yarn during knitting, high-strength container bags and tons of bagging cloth can be woven

the main indicators in the production process of woven cloth are: woven density, width, tensile strength, weight per unit area of woven cloth, etc.

3 Plastic woven bag coating process

there are many processes for producing all kinds of woven fabrics from woven cloth. It can be said that each kind of woven fabric has its own production process The species are roughly the same The process may be roughly the same or completely different

. Ordinary woven bag, non laminating woven bag is usually called: ordinary woven bag, abbreviated as: woven bag

its production process is: woven fabric through printing, cutting, sewing, until the woven bag Depending on the equipment used, it can be cut before printing, or printed before cutting Automatic cutting and sewing can continuously complete printing, cutting, sewing and other processes, and can also be made into valve pockets, bottom bags, etc. for plain woven fabrics, the bag can be made after middle seam bonding

the technological indicators of ordinary woven bags are mainly the requirements for the appearance tolerance dimension, the breaking force in the direction of seam bottom and seam edge, the clarity of printing ink and the cleanliness of other parts after printing, the accuracy of layout position, stitching trace, needle distance, and the defects such as stitching off and breakage

. Composite plastic woven bags:

the production process of two in one, three in one and other composite plastic woven bags is to compound or coat the woven cloth, coating material and paper or film The obtained cylinder cloth or sheet cloth can be cut, printed, sewed, and made into ordinary seam bottom bags. It can also be punched, folded, cut, printed, sewed, and made into cement bags. The obtained sheet cloth can be bonded, printed, cut, pasted, and made into paste bottom bags It can also be welded, rolled, made, tarpaulin, geotextile The key of composite bag making process is composite

the principle of coating is to apply the resin on the woven cloth of the substrate in the molten state Only the molten resin is coated on the woven fabric and cooled immediately to obtain the two in one woven fabric If the molten resin film is sandwiched between the woven cloth and paper or plastic film during compounding, and then the cooling anti-interference ability is strong, the three in one woven cloth can be coated on one side of the flat fabric to get the sheet cloth, or on both sides of the barrel cloth to get the coated barrel cloth The coated woven cloth can be printed, cut and sewn into various bag types, and the wide coated cloth can also be rolled and delivered as tarpaulin

coating process indicators mainly include temperature, pressure, thickness control, coating peel strength, etc

2. Refueling: All kinds of woven cloth

plain woven fabrics can be coated or uncoated to produce tarpaulins, geotextiles, etc., and cylindrical fabrics can also be coated or uncoated to produce tarpaulins or geotextiles, etc. after breaking

source: Jiangyin Qunli Plastic Machinery Co., Ltd

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