PRODUCTS SERIES & FLOW CHART

Cement Bag Making Machine and Manufacturing Process

PP woven cement bags (also known as valve bags or industrial sacks) are high-strength, moisture-resistant packaging solutions designed for cement, lime, gypsum, and other bulk construction materials. Manufactured from polypropylene (PP) flat yarn, these bags must withstand heavy loads and impact resistence, throughout the supply chain.

At Hao Yu Precision Machinery Industry Co., Ltd., we have designed and supplied complete cement bag manufacturing lines since 1980. Our turnkey solutions cover every stage — from flat yarn extrusion through circular loom, outside lamination, bag forming, multi-color printing, pasting, and automated counting — engineered for high output, precise dimensional control, and long-term reliability.

Detailed Cement Bag Manufacturing Process

01

Raw Materials Mixer (HY7-400)

This mixer uniformly blends PP/HDPE resin with additives (CaCo3, UV stabilizers, recycled polymer & colorants) before extrusion. With a capacity of 400 kg per full tank and a 2.25 kW gear reduction motor (dimension: 2,000 mm x 1,150 mm x 1,200 mm), it ensures homogeneous material composition critical for consistent flat yarn color & quality.

02

PP/HDPE High Speed Flat Yarn Extrusion Line (HE Series)

PP granules are melted and extruded into flat yarn (raffia). Max. PP melting output reaches 100/ 160/ 240/ 320/ 420/ 520/ 600 kg/hr.; Equipped with a plastics melt pump, belt-type screen filter changer, pro-back up long-life filter and rotary blade slitting system, the take-off unit is controlled by a pneumatic system, electronically tension control winder and synchronized central electronic control box — ensuring consistent yarn width, tensile strength and a flat & even winding edge.

03

Mini 6 Shuttles Circular Loom (HY7-m6SCL+)

Mini 6 shuttles circular loom HY7-m6SCL+ weaves flat yarn into tubular fabric at up to 190 rpm/minute with a capacity of 140 meters/hour (Depend on weft weaving density) with double lay web width from 350~850 mm. Featuring auto stop systems for warp & weft yarn breakage and auto compensation, it delivers high-productivity tubular weaving with no empty weaving.

The circular loom weaves flat yarn into tubular woven fabric — the primary structural layer of the cement bag. Fabric weight and weave density are calibrated to withstand the bag's fill weight (typically 25–50 kg) and the mechanical stress of high-speed automated filling systems. Hao Yu's mini six shuttle looms deliver consistent fabric quality at high throughput.

04

High Efficiency Outside Lamination Machine (HY7/LH-90U)

The woven tubular fabric passes through an outside lamination machine, which applies PP copolymer or blended polymers coating in between PP woven fabric and kraft paper. This lamination layer provides moisture resistance, surface smoothness for high-quality printing, and enhanced puncture resistance — all critical for cement packaging exposed to outdoor and construction site environments.

05

Cement Bag Tubing Machine (HY7-26MP)

This equipment consists of the following working process:

  1. Woven fabric unwinder
  2. Kraft paper unwinder
  3. Multi station in-line flexographic printing machine
  4. Bag tubing unit
  5. Center seal forming extruder
  6. Rotary type continuous bag cutting unit
  7. Bag conveyor

The multi-layer laminated woven fabric & kraft paper is cut to length and formed into the bag structure. This machine handles tube forming and bag center sealing; the cement bag tubing machine is configurable for standard cement bag sizes — 25 kg, 40 kg, and 50 kg packaging capacity.

The productivity of this machine is 160 bags/min.

06

Cement Bag Conversion Line

The conversion line performs the cement bag forming operations — starting from unsewn bags automatic feeding / bag inlet forming & sewing / bag bottom wrapping & sewing / conveyor & stacking.

The productivity of this machine is up to 50 bags/min and suitable for working material either 100% PP woven fabric, 100% kraft paper, or sandwich materials (PP woven fabric + kraft paper).

07

Finished Cement Bag

The completed cement bags are dimensionally precise, moisture-resistant, and ready for high-speed automated filling at cement plants. Available constructions include single-layer PP woven, PE-laminated PP woven, and multi-wall designs combining woven fabric with kraft paper liners. Standard capacities: 25 kg, 40 kg, and 50 kg — meeting international cement packaging standards.

Why Choose Hao Yu for Your Cement Bag Production Line?

1

46+ Years of Machinery Expertise

Established in 1980, Hao Yu has delivered PP/HDPE woven bag production lines to more than 100 countries manufacturers across Asia, the Middle East, Eastern Europe, and Latin America.

2

Turnkey Solutions

We supply the complete production line, which includes: mixer, flat yarn extrusion line, circular loom, lamination machine, printing machine, cutting & sewing machine and auxiliary equipment including hydraulic baling presses, laboratories equipment.

3

Custom Engineering

Our machines are configurable to your desire bags sizes, required output capacity (bags/hour), yarn denier specifications, and printing requirements.

4

Global After-Sales Support

Our engineering team provides installation, commissioning, and on-site training wherever you are, ensure your production line runs smooth production from day one.

FAQ

Q:
What types of cement bags can be produced on Hao Yu's line?
A:

We can provide a turnkey solution for manufacturing top & bottom sewn type cement bags (either made of 100% PP woven fabric / kraft paper / sandwich type – woven fabric + kraft paper).

Hao Yu's cement bag lines produce PP woven valve bags, PE-laminated PP woven bags, and multi-wall constructions combining PP woven fabric with kraft paper liners. Standard fill capacities are 25 kg, 40 kg, and 50 kg, with custom dimensions available for specific market requirements.

Q:
What machines are required for a complete cement bag production line?
A:

The list of required equipment mainly as follows:

  1. Raw materials mixer
  2. High speed flat yarn extrusion line
  3. Mini six shuttles circular loom
  4. Lamination machine
  5. Flexographic printing machine
  6. Cement bag tubing machine
  7. Cement bag conversion line
  8. Hydraulic baling press
  9. Downstream auxiliary
  10. Quality control equipment

A complete line requires: (1) Mixer Machine, (2) Flat Yarn Extrusion Line, (3) Circular Looms (6 or 8 shuttles), (4) Outside Lamination Machine, (5) Cement Bag Forming Machine, (6) Unwinder Roll / Printing System, (7) Preforming & Pasting / Forming System, (8) Extruder / Cutting & Counting, and (9) Cement Bag Conversion Line.

Q:
Why is outside lamination critical for cement bags?
A:

The cement bag must have outside lamination, as moisture would otherwise spoil the packaged cement; outside lamination keeps the cement dry on the inside of the bag.

Lamination applies a BOPP or PE film to the outer woven surface, providing moisture resistance, print quality, and puncture resistance. For cement packaging, moisture resistance is especially critical — cement is highly sensitive to humidity, and a compromised bag can cause product caking and customer returns.

Q:
What is the function of the valve on the cement bag, and how is it filled at cement plants?
A:

The valve on the cement bag is designed for quick filling of cement, an ideal industrial design for fast loading of cement from the cement plant.

Cement is filled into the bag using a high air flow pneumatic system, which ensures the cement is loaded into the bag within just a few seconds.

Q:
How do I get a quote for a cement bag production line?
A:

Contact Hao Yu Precision Machinery Industry Co., Ltd. with your target bag specifications (size, weight capacity, construction type), required output (bags/hour), printing requirements (colors, design), and lamination specifications. Our engineering team will recommend the appropriate configuration and provide a detailed quotation.

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