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cement bag production processes

1. Purchasing raw material: random check, assessing material quality through observing color, grossness, cleanness, sandiness.
2. Stirring: mixing materials in different colors together to meet client’s request. Mixing proportion is the key point, which will affect the color and strength of woven silk. Stirring should be well-distributed. Drying step is only for color material. Mixing machine should be cleaned every time after stirring color material to avoid affecting the color of next product.
3. Drawing machine: The key point in this step is temperature control. It also affects the color and strength of woven silk.
4. Circular loom: Ring size decides the width of product, ±1 cm is acceptable. Paying attention to the color of woven silk, if any woven silk with noticeable color shade, technicians should pick it out. If any broken woven silk occurs, technicians should stop machine and connect the silk.
5. Melting granule into liquid and laminating bags. The critical point in this step is temperature control, excessive temperature will damage the bags, and laminate will fall if temperature is too low.     
6. Ink is crucial in printing, ensure the printing content is correct.
7. paying attention to the deviation of length while cutting bags, the cut should be smooth. Be
careful of the size and depth of the cover patch. Sewing bags per client’s request, choosing
threads (nylon/cotton/both), hemming, singe/double folded (length should add 1.5 cm while
cutting for double folded), keeping an eye on the size of top and bottom and width of threads,
avoiding skipped or slanted stitches.
While sewing feedbag, the width of hem should less than 2 cm and avoiding skipped stitches. 
8. Purchasing liner bags for feedbag, weight of liner bags is 22g/16g/19g/5g,client could choose as needed. Liner bag should be adjacent to the bottom of outside bag. 
9. Packing and Storage: color of cement bags are yellow and white. Usually we provide 400 pcs a unit, 30-40 kg per unit, or per client’s requirement. Each unit is wrapped with women bag, and bundled with rope.
10. g/cm² = total weight/(length*width*2),make it clear to client the difference between g/cm²and total weight. Several factors will influence the g/cm², such as thickness of strands, density, thickness of laminate, raw material, etc.
11. Pull test: cut 4 stripes from bag, 2 for weft, 2 for warp, 5 cm in width, ≥ 25 cm in length. Calibrating test machine for different materials (woven silk/cloth), setting pull strength in computer, usually 2000N for woven cloth. In normal situation, the pull property will decrease after lamination. Weighing bag by scale, then calculate the value of g/cm², which client would require us to apply for quality control. The actual g/cm² should be the value minus 1g for ink and 1.5-1.6g for laminate. Pull test result standard:400N for weft,350N for warp, ±50N is acceptable.