Designed to eliminate web snap, ultrasonic weld burn-through, and gusset micro-cracking during automated bag conversion, OYANG provides factory-certified bag making raw materials matched to high-speed forming lines. Our substrate portfolio includes premium brown kraft paper roll reels (30–300 GSM, moisture-balanced at 6.5% ± 1%), GRS-certified spunbond nonwoven roll fabrics (30–120 GSM, ultrasonic-frequency tuned), and multi-layer high-barrier bopp roll films (12–200 μm, corona treated ≥ 38 dynes/cm). Experience single-source accountability with zero web tracking deviation across OYANG paper bag, nonwoven box bag, and flexible pouch machinery.
Select your converting substrate below to inspect physical tensile thresholds, core diameters, and compatible bag making machinery.
High-tensile virgin brown kraft paper roll and bleached white kraft reels (30–300 GSM). Pre-conditioned for sharp creasing, non-bursting gussets, and water-based adhesive bonding on roll-fed paper bag machines.
100% polypropylene spunbond and recycled post-consumer nonwoven roll substrates (30–120 GSM). Engineered with stable melt flow index (MFI 35) for instant 20 kHz ultrasonic horn bonding without pinhole perforation.
Solvent-free laminated high-barrier bopp roll, CPP, and PET packaging films (12–200 μm). Optimized with low seal initiation temperature (SIT ≤ 105°C) for high-speed stand-up doypack and 3-side seal pouch makers.
In high-speed bag converting lines, raw material thickness variations and moisture imbalance are the primary causes of roll telescoping, ultrasonic horn overheating, and web tear. OYANG benchmarks every reel against strict laboratory-tested rheological and mechanical thresholds:
| Raw Material Substrate | Physical Tolerance / Chemical Spec | Converting Performance Impact |
|---|---|---|
| Brown Kraft Paper Roll | Moisture content: 6.5% ± 1.0%; TEA index > 2.2 J/g | Prevents edge cracking during 90° bottom gusset scoring; stabilizes water-based adhesive cure rate in roll-fed paper bag machines. |
| PP Spunbond Nonwoven Roll | Melt Flow Index (MFI): 35 ± 3 g/10min (230°C, 2.16kg) | Guarantees rapid molecular fusion during 20 kHz ultrasonic handle stamping, eliminating cold-welds and preventing fabric pinholes. |
| BOPP Roll Barrier Film | Surface tension ≥ 38 dynes/cm; Seal Initiation Temp ≤ 105°C | Prevents ink flaking during 10-color flexo/gravure printing; ensures airtight hermetic side seals at 240 CPM on pouch conversion lines. |
| GRS Recycled RPET Nonwoven | Melting temp: 255°C–260°C; Cross-direction elongation < 25% | Delivers 5× higher tensile strength than standard PP; fully compliant with EU Packaging Waste Regulations and Global Recycled Standard audits. |
Every substrate batch delivered by OYANG is pre-tested across our automated converting test-bench lines inside our 130,000 m² manufacturing park, guaranteeing that material tension profiles, core roundness (TIR ≤ 0.5 mm), and surface energy perfectly synchronize with machine unwind units.
Standard industrial specifications matched to commercial bag profiles.
| Bag Type | Substrate Material | GSM / Caliber | Commercial Application |
|---|---|---|---|
| Shopping Bag (Twisted Handle) | Brown Kraft Paper Roll | 70–120 GSM | Apparel Retail, Supermarkets |
| SOS / Sharp-Bottom Fast Food Bag | Brown Kraft Paper Roll | 35–80 GSM | Bakery, Fast Food, Takeaway Chains |
| Nonwoven 3D Box Bag | Nonwoven Roll (PP Spunbond) | 70–100 GSM | Grocery Reusable Totes, Food Delivery |
| Premium Retail Reusable Bag | Nonwoven Roll (GRS RPET) | 80–120 GSM | EU/US Department Stores, Bags for Life |
| 3-Side Seal Barrier Pouch | BOPP Roll / AL / PE | 45–110 μm | Cosmetics, Facial Masks, Pharmaceuticals |
| Stand-Up Zipper Pouch (Doypack) | BOPP Roll / AL / CPP | 70–150 μm | Coffee, Pet Food, Nuts, Specialty Snacks |
Clear engineering answers regarding substrate machine compatibility, minimum order quantities, eco-certifications, and container shipping.
Tell us your bag making machine model, target bag dimensions, and required monthly substrate tonnage. OYANG engineers will match the optimal GSM, core format, and surface treatment, dispatching lab-certified test rolls within 5 business days.