The utility model pertains to a compound cement bag formed of a woven net made of  plastic, of which the center layer is knitted silk made of polypropylene plastics. Among these, polypropylene is regarded as the most crucial component of the cement plastic bags manufacturing process and affects the packaging’s quality. Let’s discover the cement packaging bags material and the comprehensive cement plastic bags manufacturing process

PP yarn –> Woven PP fabric sheet –> Coated PP fabric film –> Printing on PP bags –> Finished products (hot air welding).
The cement bag production line is produced under a rather complicated process.

1. Make PP yarn

PP plastic granules are loaded into the hopper of the yarn-forming device, by the suction machine put into the extruder, and heated to melt. The screw extruders the liquid plastic to the mold mouth with adjustable length and thickness as required, and plastic film is formed through the forming cooling water bath. Then the film enters the cutter shaft to slit into the required width (2-3 mm), the yarn goes through a heater to be stabilized and then put to the winding machine.

In the process of creating yarn, the fiber wastes and bavia of the plastic film are recovered by suction, cut into small pieces, and returned to the extruder.

2. Woven PP fabric sheet

The PP yarn rolls are put into the 06 shuttle circular loom to weave into PP fabric tubes, through the PP fabric winding mechanism.

3. Coated PP fabric film

The PP fabric roll is installed by the forklift truck on the film coating machine, the PP fabric sheet is coated with a thickness of 30 PP plastic to increase the bond of moisture-proof fabric. Roll of PP fabric coated and rolled.

4. Printing on PP bags

OPP film lamination is the most professional and beautiful bag, gravure printing technology on OPP film, and then grafting this film onto a roll of woven PP fabric.

5. Finished product cutting and packing

Non-Printed or Flexo Printed PP Woven Bags: Woven PP rolls are passed through the hip folding system (if any), and the finished product is cut. Then sew first, print later, or sew later, print first. Finished products go through automatic counting conveyor and bales packing.

PP woven bags with gravure printing film in rolls are passed through an automatic system of side folding, edge pressing, cutting, bottom sewing, and packing.

In a nutshell, polypropylene polymer is the material of choice during the cement plastic bags manufacturing process when it comes to the production of packing bags for cement. The storage, transportation, and handling of cement are all activities that benefit from the physical, chemical, and mechanical properties of polypropylene.

Cement bags specification:

Woven bags are mainly speaking: plastic woven bags are made of polypropylene (PP in English) as the main raw material, which is extruded and stretched into flat yarn, and then woven, woven, and bag-made.

1. Industrial and agricultural product packaging bags
2. Food packaging bags