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PP / HDPE Woven Bags, Woven Sacks Manufacturing Process

PP / HDPE Woven Bags (also known as woven sacks or PP sacks) are versatile, high strength packaging solutions made from flat yarn extruded from polypropylene(PP) or high-density polyethylene(HDPE) resin. Widely used in general commodity packaging, such as agriculture, construction, and chemical industries, woven bags offer excellent loading capacity, moisture resistance, and environmental recycling.

At Hao Yu Precision Machinery Industry Co., Ltd., we have engineered complete PP/HDPE woven bag production lines since 1980. Our turnkey solutions cover every stage: from flat yarn extrusion, circular loom weaving, lamination, printing, conversion to woven bag and quality control equipment — ensure delivering consistent output, quality products and long-term reliability.

Detailed PP / HDPE Woven Bag Production 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/HDPE granules are melted and extruded into flat yarn (raffia). Max. PP melting output reaches 100/ 160/ 240/ 320/ 420/ 520/ 600 kg/hr.; Max. HDPE melting output reaches 80/ 120/ 190/ 250/ 320/ 400/ 480 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.

04

High Speed Auto Cutting & Sewing Machine (HY7/SP-150H)

A fully automatic high speed conversion line driven by servomotor that produce bottom folding & sewing bags directly from tubular cloth rolls. The line integrates cutting, sewing, and count-stacking sections. Its unique design equips minimal moving parts — dramatically reducing labor consumption and maintenance requirement while maintaining high throughput and ease of operation.

05

One Side Manual Feeding Type Printing Machine (HY7-104)

Piece-by-piece printing machine fed plain manually, with a production speed up to 50 pcs/minute (average 40 pcs/minute).

The printing drum can change its position (Left to right & up to down). Each color has an individual ink circulation pump, enabling precise four-color on one-side printing. Easy operation and minimal maintenance make it ideal for woven bags production.

06

Finished PP / HDPE Woven Bag

The woven bags are 100% recyclable, high-strength, moisture-resistant, and high flexibility ready for downstream use. Common end products include packaging for agriculture (Rice, sugar, wheat flour, salt, bean, animal feeds, fertilizer and vegetable), construction materials (sand, powders, stone), and chemical or industrial products.

The hydraulic baling press (HY7-20TS) is available for packing finished bags (With 30 tonnage pressing force) press bags into bale-type, ideal for saving storage area and for customer delivery.

Why Choose Hao Yu for Your Woven 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 raw materials are used in PP/HDPE woven bag manufacturing?
A:

Woven bags are produced from polypropylene (PP) or high-density polyethylene (HDPE) resin granules, blended with additives including UV stabilizers, lubricants, and colorants. The formulation is adjusted based on target bag strength, flexibility, weight, and end-use application requirements.

  • It is recommended to use the polymers under Raffia Tape Extrusion Grade and the melt flow index recommended (PP - 2 ~ 5 g/10 min / HDPE - 1~5 g/10 min).
  • For different types of woven fabric products, different MFI polymers may apply, and the polymer can be either virgin or Post Industrial Recycled polymer.
  • The mixing ratio of PIR polymer can range from a minor % up to 100%, depending on your required product standard.
Q:
What machines are required for a complete woven bag production line?
A:

A complete PP/HDPE woven bag production line requires: (1) Mixer Machine, (2) Flat Yarn Extrusion Line, (3) Circular Loom (6 or 8 shuttles), (4) High Speed Auto Cutting & Sewing Machine, and (5) Printing Machine. Auxiliary equipment includes a hydraulic baling press and optional lamination line for laminated woven bags.

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. Auto cutting & sewing machine
  7. Hydraulic baling press
  8. Downstream auxiliary
  9. Quality control equipment
Q:
What is the production speed of Hao Yu's mini six shuttles circular loom?
A:

Hao Yu's mini six-shuttle circular loom (HY7-m6SCL) operates at up to 183 rpm/minute with a capacity of 135 meters/hour. The mini four-shuttle leno loom (HY7-m4SCL) reaches up to 100 m/hour. Both models feature auto stop systems for warp & weft yarn breakage and auto compensation for consistent, unattended operation.

Our HY7-m6SCL+ mini six shuttles circular loom speed is up to 190 rpm, and prior to making woven fabric, the real output per day (24 hrs - 3 shifts) is between 3,000 ~ 6,000 m. The production output varies subject to working width / raffia tape quality / weft weaving density.

Q:
What products can be packaged in PP/HDPE woven bags?
A:

PP/HDPE woven bags are suitable for agriculture products (rice, sugar, flour, salt, bean, fruit, vegetable, fertilizer), construction materials (sand, powder, stone), and chemical or industrial products. Their high load capacity, moisture resistance, and printability make them ideal for bulk packaging across multiple industries.

Ideal design for packaging general commodity from 10 kg ~ 120 kg, such as:

  • Agriculture products (Rice, sugar, wheat flour, salt, bean, animal feeds, fertilizer, vegetable, etc.)
  • Construction materials (Sand, cement, powders, stone, etc.)
  • Chemical & petrochemical materials (Urea, polymers, CaCo3, etc.)
  • Industrial products packaging and so on
Q:
How do I get a quote for a woven bag production line?
A:

Contact Hao Yu Precision Machinery Industry Co., Ltd. with your target bag dimensions, required output capacity (bags/hour), material specifications (PP or HDPE), and printing requirements. Our engineering team will recommend the appropriate production line configuration and provide a detailed quotation.

You can reach us via:

  1. Our company e-mails: [email protected] / [email protected]
  2. Our company telephone: +886-4-26303998
  3. Our company WhatsApp: +886-919042429
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