If you run a bag making machine (side seal, bottom seal, or FFS machines), you know the frustration: melted plastic residue builds up on standard belts, causing poor seal quality, stuck bags, and constant cleaning stops.
The solution? A silicone belt for bag making machines — specifically designed to resist heat and release molten plastic instantly.
But not all silicone belts are equal. Below is a practical guide for bag makers to select, maintain, and source the right silicone belt for your specific OEM machine.
Standard PU or PVC belts absorb heat and allow molten polyethylene (PE) or polypropylene (PP) film to stick. This causes:
Silicone belts solve these problems:
| Property | Standard PU/PVC Belt | Silicone Belt (Annilte) |
|---|---|---|
| Non-stick performance | Poor – plastic adheres | Excellent – molten film releases instantly |
| Heat resistance (continuous) | 80–100°C (176–212°F) | 200–230°C (392–446°F) |
| Release coating life | Wears off in weeks | Full thickness – lasts belt lifetime |
| Cleaning frequency | Daily | Weekly or less |
Bottom line: Switching to a silicone belt reduces cleaning downtime by 70–80% and extends belt life 3–5x.
2. Heat Resistance – The #1 Requirement for Bag Sealing
Bag making machines operate near sealing jaws at 150–200°C (302–392°F) . Radiant heat and occasional contact destroy ordinary belts.
What temperature rating do you need?
Machine Type Sealing Temperature Minimum Belt Rating Side seal bag machine 150–180°C (302–356°F) 200°C continuous Bottom seal bag machine 160–200°C (320–392°F) 230°C continuous FFS (form-fill-seal) 140–170°C (284–338°F) 200°C continuous Annilte silicone belt series:
Grade Continuous Temp Intermittent Temp Best For SI-200 200°C (392°F) 230°C (446°F) Most side/bottom seal machines SI-230 230°C (446°F) 260°C (500°F) High-speed or high-heat lines SI-FDA 200°C (392°F) 230°C (446°F) Food-contact applications Warning: Cheap “silicone-coated” belts only have a thin surface layer. Once it wears through (usually 2–3 months), the underlying belt fails. Annilte belts are solid silicone or full-thickness silicone compound — no coating to wear off.
3. Surface Finish – Smooth vs. Textured for Bag Release
The belt surface finish affects how bags release and stack.
Surface Best For Advantage Smooth (glossy) Thin films (20–50 microns), high-speed lines Maximum release, minimal drag Fine texture Medium films (50–100 microns), stacked bags Prevents bag sliding, better stacking Coarse texture Thick films, heavy bags Maximum grip, prevents bag wandering Annilte standard: We offer all three finishes. Most bag makers prefer smooth or fine texture for optimal release.
Ask your supplier: Can you provide samples of each finish for testing? We can — free of charge.
4. OEM Compatibility – Exact Fit for Your Bag Machine
Your bag making machine expects specific belt dimensions and construction. Using the wrong belt causes tracking issues, tension problems, or complete incompatibility.
Annilte maintains OEM cross-references for major bag machine brands:
Brand Common Machine Models Belt Type / Spec Annilte Replacement Part # Totani Totani G series, N系列 Silicone flat belt, 2mm thick, 50mm wide AN-TOT-SI-2050 Hudson Sharp Hudson Sharp 1060, 1080 Silicone timing belt, T5 pitch AN-HS-T5-SI Windmöller & Hölscher (W&H) W&H AD 2000, AD 3000 Silicone flat belt with V-guide AN-WH-VG-SI GN Equipment GN 800, GN 1200 Silicone belt, 3mm thick AN-GN-SI-3MM Mamata Mamata Mega, Plus series Silicone flat belt, 1.5mm AN-MAM-SI-15 Lohia Lohia Star, Lohia Plus Silicone timing belt, AT5 AN-LOH-AT5-SI FFS machines Various (Bosch, Rovema, Ulma) Silicone belt, custom length Contact Annilte