Kraft paper laminated flat‑mouth woven bag | Three‑layer composite accordion‑edge granule packaging bag | Economy‑grade paper‑plastic composite open‑mouth packaging bag | Paper‑plastic composite M‑edge open‑mouth bag

I. Overview of Basic Products

II. Applicable Industries

1. Building materials industry: sand, quartz sand, granular putty, crushed stone aggregate, insulating granules, lime granules
2. Chemical raw materials: plastic pellets, resin pellets, rubber granules, bulk additives, and coarse calcium carbonate powder.
3. Agricultural inputs and feed: granular fertilizers, compound fertilizers, feed pellets, organic fertilizer pellets, and livestock feed.
4. Grain and agricultural by-products: rice, wheat, corn, miscellaneous grains, bran, and cereal feed.
5. Others: mineral granules, construction aggregates, horticultural potting soil, plastic resin pellets

III. Applicable Materials

IV. Core Advantages

1. M-side accordion-style three-dimensional structure; bag expands after filling, ensuring neat stacking.

1. The side‑m‑shaped gusset allows the bag to naturally expand into a three‑dimensional square shape once filled, preventing the sides from collapsing. This ensures neat stacking on pallets and, compared with standard straight‑edge flat bags, offers greater capacity and improved stability.
2. Paper-plastic composite double-layer structure, providing basic protection against leaks, dust, and moisture.

1. The outer kraft paper layer prevents surface dust from escaping, while the inner laminated PP woven fabric locks in materials and resists moisture. The bag’s bottom is heat-sealed with seamless edges, minimizing spillage during the handling of coarse particles and powders and helping to reduce dust generation in the workshop.
2. Monochrome ink printing, a cost-effective economy model.

1. Standard configuration includes single-color printing, allowing you to print your brand logo, product name, specifications, and applicable standards. Plate-making and printing costs are low, and blank bags in stock can be shipped quickly, making this solution ideal for large‑volume basic packaging while effectively controlling packaging procurement expenses.
2. The PP woven base material is high-strength, capable of bearing heavy loads, resistant to tensile forces, and puncture-resistant.

1. The inner layer of polypropylene woven fabric is highly durable, resistant to tearing during loading, unloading, handling, and forklift operations, and can support weights of 10–50 kg, making it ideal for both short‑haul and long‑haul logistics.
2. Plain-mouth universal design, compatible with most standard filling equipment.

1. No dedicated valve‑type filling machine is required; it can be used with manual bagging, semi‑automatic open‑mouth bagging machines, or simple granule fillers, offering broad versatility and allowing direct integration into both new and existing production lines without any modifications.

V. Leak-Proof and Dust-Proof Design Details

1. M‑side accordion‑fold, integrally molded: the side folds are seamless, preventing granular material from leaking through the side seams after filling.
2. Full‑width heat‑seal bottom sealing process: the bag bottom is sealed with high‑temperature hot melt, eliminating pinholes and gaps to prevent granules and coarse powder from leaking at the base.
3. High-temperature paper-plastic composite with no delamination: Kraft paper and PE‑laminated woven fabric are tightly bonded, providing an effective barrier against dust and moisture penetration through the bag body.
4. Wide bag opening with a reserved seam allowance: After filling, the bag opening can be fully sewn shut, and during transport, the opening remains sealed to minimize dust generation.

VI. Materials and Manufacturing Processes

Three-layer composite standard material

1. Outer layer: 80–120 g/㎡ natural kraft paper, with a crisp, structured bag body and clear monochrome printing.
2. Intermediate layer: PE moisture-barrier coating, preventing atmospheric moisture from penetrating into the bag;
3. Inner layer: New PP polypropylene woven fabric, high-density weave, resistant to stretching and puncture.

Complete production process flow

VII. Physical Performance Parameters

1. Tensile strength (in accordance with the national standard GB/T 17858.3 for packaging bags)

2. Moisture-proof rating

3. Packaging Drop Test

VIII. Compatible Filling Methods

1. Manual open-mouth bagging and filling (mainstream)
2. Semi-automatic granule/powder open-mouth bagging machine
3. Simple screw-type, gravity-fed small open‑mouth filling equipment

9. Standard Packaging Specifications (In Stock)

The bag’s width, height, and M‑edge fold depth can all be customized to meet your requirements.

X. Scope of Customization

1. Printing: Standard configuration includes a single-color monochrome ink printing option; upgradeable to 2–4 colors. Free layout and design services for your logo and product information.
2. Dimensions: Custom full-size, accommodating all load weights from 10 to 50 kg; the M-side fold width is adjustable.
3. Material upgrades: thickened kraft paper, double-layer thickened PE moisture-proof lamination, food-grade non-fluorescent kraft paper, and thickened, tightly woven fabric.
4. Customizable structure: widened M‑style accordion edge, raised bag opening with sewn-in seam allowance, and an integrated PE inner liner bag.
5. Additional features: perforated, breathable body; side handle holes; non-slip laminated inner layer.
6. Appearance options: Two choices—natural yellow kraft paper and white kraft paper.

XI. Environmental Compliance Statement

All raw materials are made from virgin PP woven fabric and wood-pulp kraft paper, with no recycled or reclaimed waste mixed in.

1. Water-based ink printing contains no heavy metals or harmful solvents, complies with domestic agricultural and chemical packaging standards, and meets the EU RoHS environmental compliance requirements.
2. Discarded packaging bags can be sorted and recycled: kraft paper is collected as paper, while PP woven fabric can be recycled as plastic; a biodegradable kraft‑paper version is available upon request.
3. Dedicated formulations for grains and food-grade raw materials can provide food-contact safety test reports and are suitable for packaging rice, feed, and food granules.

XII. Pricing and Minimum Order Quantity

Negotiable

Thirteen: Summary of Product Application Scenarios