Dimensional check
Width, length, gusset, bottom and valve position are measured against the approved drawing.
Quality & factory
Quality is a specification, not a slogan.
A valve bag has only a few ways to fail: a weak seam, a valve that does not fit, a film that punctures or a print that rubs off. Our QC plan is built around those failure modes.
Process control
From material intake to the loaded pallet.
Checks are placed where a problem can still be corrected — not only at the end of the line. The sequence below is the standard path; the exact test plan is agreed in the quotation.
- 01
Incoming material
Resin, film, paper, fabric and ink are checked against the approved specification and lot information.
- 02
In-process checks
Thickness, grammage, lamination bond and print are monitored during extrusion, weaving, lamination and printing.
- 03
Conversion & valve
Bag dimensions, valve position, seam strength and bottom construction are checked against the approved sample.
- 04
Pre-shipment
Filled samples are drop and stack tested; print, valve function and packing count are confirmed before loading.
- 05
Traceability
Batch identification links the finished pallet to the production run and the material lots used.
Test plan
The checks behind a bag that behaves.
Not every order needs every test. We agree the plan with you, based on the product, the filling line and the market. These are the checks we use most often.
Valve fit & function
The valve is checked against the agreed spout dimensions and opened and closed repeatedly.
Seal / weld strength
PE seals, laminated seams and pasted paper joints are pulled and inspected for consistent bonding.
Drop test
Filled samples are dropped on the base, side and corner to expose weak seams and film punctures.
Stack test
Filled bags are stacked to the agreed pallet height and checked for deformation and stability.
Print adhesion
Printed areas are checked for coverage, registration and adhesion on the actual substrate.
Moisture barrier
Barrier film, coating and liner integrity are checked when the product is moisture-sensitive.
Food-contact documents
Material declarations and food-contact documentation are prepared when specified in the quotation.
Third-party certifications and market-specific declarations are quoted separately. Tell us the destination and compliance requirement before the order is placed so we can confirm what is available for the material.
Documentation
What your buyer will ask for.
Export orders need more than bags. We prepare the commercial and technical documents agreed in the quotation so the shipment can clear and the specification can be verified.
Ask about documentation01
Commercial invoice & packing listQuantity, dimensions, weights and marks.
02
Batch / production recordLinks the shipment to the production run.
03
Test reportResults for the checks agreed in the quotation.
04
Material declarationResin, paper, film and food-contact information on request.
05
Shipping documentsBill of lading, certificate of origin and other documents as agreed.
Packing & export
Protected before it leaves the factory.
Bags are packed for the journey, not just for the warehouse. We confirm bale or carton configuration, pallet pattern and container loading before the order ships.
Baled or cartoned
Flat-packed bales or cartons protect the bags and keep handling efficient. Bale weight and labels are agreed per order.
Palletised
Pallet dimensions, stack height and corner protection are set to suit the container and the destination warehouse.
Loaded & documented
Container loading is checked against the packing list. We ship from Ningbo / Shanghai with the export documents agreed in the quote.
3,500 m²production base
60+team members
25Mvalve bags / year
4material systems
Quality questions
Tell us the standard. We will tell you how we meet it.
Share the product, destination market and the tests or declarations your buyer requires. We will confirm the test plan, documentation and sample requirements before quoting.