Quality Control & Testing for Industrial Packaging Materials
Our packaging quality control covers every order of steel strapping, PET strapping, stretch film and strapping seals: checked at incoming material, during production and before packing, and shipped with an inspection report from our own lab in Changzhou.
Four Quality Checkpoints, From Raw Material to Shipment
Packaging quality control at JUHONG runs at four checkpoints: incoming material, in-process checks every two hours, final sampling before shipment, and an inspection report with every order. Our quality system is certified to ISO 9001:2015, and every check follows a written procedure.
Incoming Material Inspection
Steel coils, PET resin, LLDPE resin, paper cores and pallets are checked before they enter production.
- Steel coils: appearance, thickness and tensile strength, checked against the supplier's data
- PET resin: appearance and viscosity
- LLDPE resin: appearance
- Paper cores and pallets: checked on arrival
In-Process Spot Checks
Inspectors take random samples from every line during production and measure them against the order specification.
- Width, thickness and strength on every line
- Steel strapping line: 10 coils checked every two hours
- A failed bend or tensile test stops the line, and the last two hours of output are scrapped
Final Inspection Before Packing
Finished coils and rolls are sampled again for dimensions and strength, and weighed.
- Dimensions and strength re-checked on samples
- Coil and roll weight confirmed on the scale
- Rejected product goes to a separate area, then is reworked and re-inspected, or scrapped
Inspection Report With Every Order
Each shipment leaves with a factory inspection report for that order.
- Report covers the products in that shipment
- Inspection results are recorded and kept on file
- Third-party testing can be added on request
Third-party testing, such as SGS, can be arranged for any order.
Steel Strapping Inspection
Steel strapping secures heavy loads such as steel coils and building materials, so it is tested for size and tensile strength at the raw coil, during production and before shipment.
Raw Steel Coil Inspection
Each incoming steel coil is checked for surface appearance, thickness and tensile strength. Its steel grade, chemical composition and mechanical properties are also checked against the supplier’s data.
In-Process Checks
Inspectors take 10 coils from the line and check width, thickness, tensile strength, bend performance, paint coating thickness on painted strapping and salt spray resistance of coated strapping. A failed bend or tensile result stops the line, and the last two hours of output are scrapped.
Final Inspection & Coil Weight
Finished coils are sampled again for width, thickness and tensile strength, and weighed before packing. SGS tested our 19 × 0.8 mm steel strapping to the EN 13246 method: 1,082 MPa tensile strength and 14.5% elongation, for the sample tested.
Steel Strapping Tests We Run
Strap samples are clamped in the tensile testing machine and pulled until they break.
Samples are checked for bend performance on our bend tester.
Coated strapping is checked for corrosion resistance in the salt spray chamber.
Width and thickness are measured against the order specification and the tolerances below.
Finished coils are weighed on the floor scale and the weight is recorded before packing.
Steel Strapping Tolerances We Check
From our written steel strapping inspection procedure.
Strapping Seal Inspection
A seal is only as good as its grip on the strap, so seals are checked at the punch presses and again before shipment. JUHONG is one of the drafting organizations of GB/T 39040-2020, China’s national standard for steel seals and edge protectors for packing.
Incoming Steel
Steel strip and sheet for seals are bought in and checked on arrival for grade, size, surface and mechanical properties.
Punching Checks
Inspectors check punched seals against the drawing with calipers, and look for burrs, cracked edges and poor forming.
Coating Checks
Painted seals are checked for even coverage and colour. Galvanized seals go through a 24-hour salt spray test and a cross-cut adhesion test.
Final Check
Seals are sampled for size, appearance and coating, and the logo, packing and quantity are checked against the order before shipment.
Strapping Seal Tests We Run
Seals are measured with calipers against the drawing.
Edges and forming are checked at the punch press.
Galvanized seals are tested for 24 hours in the salt spray chamber.
A strap joint made with our seal is pulled on the tensile tester.
Seal Requirements We Check
From our written seal inspection procedures and GB/T 39040-2020, which we helped draft.
PET Strapping Inspection
PET strapping is checked from the resin to the finished coil. Break strength depends on both the resin and the stretching process.
Resin Inspection
Each batch of PET resin is checked against a colour sample, spread on white paper to spot black specks and impurities, and tested for viscosity before it is used.
In-Process Checks
Every two hours, inspectors take 10 coils from the line and check appearance, size and break strength. A failed break strength or elongation test stops the line, and the last two hours of output are scrapped.
Final Inspection & Report
Before shipment, 5 coils are taken at random from the batch and tested for break strength, elongation, size, camber and weight. If any sample fails break strength or elongation, the whole batch is rejected. The order ships with an inspection report.
PET Strapping Tests We Run
Each resin batch is tested for viscosity before it is used.
Strap width is measured with calipers.
Strap thickness is measured with a micrometer.
Samples are pulled to break on the universal testing machine.
PET Strapping Tolerances We Check
Unless the order sets its own tolerances.
Stretch Film Inspection
Stretch film testing goes beyond thickness. A film can be the right gauge and still tear on a sharp pallet corner, so we also test puncture resistance and elongation.
Resin Appearance Check
Each batch of LLDPE resin is checked for appearance before it goes into production.
In-Process Checks
Line operators record process readings during production. Inspectors take random samples and check film thickness and width, puncture resistance and elongation.
Final Sampling & Roll Weight
Before shipment, rolls are sampled and checked for appearance, size, tensile force, elongation at break and cling, and weighed. Each order ships with an inspection report.
Stretch Film Tests We Run
Samples from the line are checked for thickness and width.
Film is loaded into the puncture fixture on our film tester.
A film strip is clamped in the tester grips and stretched to break.
Finished rolls are weighed before shipping.
Stretch Film Limits We Check
Checked to BB/T 0024-2018, China’s industry standard for stretch wrap film for transport packaging. If you need results to ASTM methods, testing can be arranged with a third-party lab.
We Inspect Bought-In Materials Too
Paper cores, pallets, cartons, paint and labels are checked when they arrive, so the materials around your strap and film meet the same standard.
Paper Cores
PET strapping cores are measured for inner and outer diameter and wall thickness. Stretch film cores are checked for wall thickness and weight, and go through a flat crush test.
Cartons
Board grade, print, size, fold and glue strength are checked.
Wooden & Plywood Pallets
Each batch comes with a fumigation report. Pallets are checked for mould, insects and rot, moisture content and size.
Paint, Wax & Pigment
Each batch needs a certificate and composition report, enough shelf life left, and no hardening.
Labels & Printed Packaging
Print content, barcodes and size are checked against the artwork.
We buy from suppliers on our approved list, reviewed every year, and inspect a new supplier’s first samples before regular deliveries start.
Calibrated Gauges, Records & Traceability
A test result is only as good as the tool and the record behind it. Here is how we keep our checks accurate and every order traceable.
Calibrated Measuring Tools
Gauges and testers are calibrated on a fixed schedule, by accredited labs or against reference standards traceable to national standards. A tool past its date is tagged and taken out of use.
First-Piece Approval
The first pieces of every order, every shift and every machine restart after repair are approved by QC before production continues.
Records & Retained Samples
Inspection results are written on record sheets and kept on file. Samples from each batch are kept in the lab.
Nonconforming Product
Rejected product is held in a separate area, reworked and re-inspected, or scrapped.
Traceability Test
Twice a year we trace a shipped order back to its raw material batch, and a raw material batch forward to its shipments.
Third-Party Testing & Certifications
Our in-house results can be confirmed by an independent lab. SGS or another third-party lab can test your order to the standard you name, including ASTM methods. Our quality management system is certified to ISO 9001:2015, and we hold AAR verification under AAR ID: AAR-124 for approved steel strapping and PET strapping products.
Packaging Quality Control FAQ
Do you provide an inspection report with every order?
Yes. Every order ships with a factory inspection report for the products in that shipment.
Can you arrange SGS or other third-party testing?
Yes. Tell us the test items and the standard you need, including ASTM methods, when you order, and we will arrange testing by SGS or another independent lab.
What tests do you run on steel strapping?
Incoming steel coils are checked for appearance, thickness and tensile strength. Every two hours we take 10 coils from the line for width, thickness, tensile and bend tests, paint thickness and salt spray. Finished coils are checked again and weighed.
How do you check PET strapping break strength?
Samples are pulled to break on our universal testing machine during production and before shipment. If any sample fails break strength or elongation, the batch is rejected.
What standard do you check stretch film against?
BB/T 0024-2018, China’s industry standard for stretch wrap film for transport packaging. Testing to ASTM methods can be arranged with a third-party lab.
Do you test galvanized seals for corrosion?
Yes. Galvanized seals go through a 24-hour salt spray test and a cross-cut adhesion test.
Are your measuring tools calibrated?
Yes. Gauges and testers are calibrated on a fixed schedule, and any tool past its date is taken out of use.
Can I watch a test by video?
Yes. Book a live video tour and we will run tests in the lab while you watch.
Samples & Test Reports
Request a Sample or Test Report
Want to check our strapping, film or seals against your own specification? Tell us the product, size, standard and tests you need, and we will send samples and a test report, or run the test while you watch on video.
- Samples and test reports for your sizes
- Third-party testing by SGS on request
- Live video tests in our lab