1. Precise Sizing & Packaging Cost Transparency
Stationery and paper products strictly adhere to the international ISO 216 paper standard (A3, A4, A5). Our packaging machine is designed around these universal dimensions, running standard 0.04 mm0.04 mm (40 μm40 μm) polymer self-adhesive bags with a 40 mm40 mm self-adhesive flap:
| Size Format |
Finished Bag Size (W × L) |
Unfolded Film Dimensions (L × W) |
Unit Film Weight |
Raw Material Film Cost (Ref. 13 RMB/kg) |
Primary Stationery & Gift Applications |
| A5 Size |
148×210 mm148×210 mm |
460×148 mm460×148 mm |
2.49 g2.49 g |
￥0.0324 (~$0.0045) |
Pocket notebooks, diaries, greeting cards, sticker packs, art pencils, craft gift kits |
| A4 Size |
210×297 mm210×297 mm |
634×210 mm634×210 mm |
4.87 g4.87 g |
￥0.0633 (~$0.0090) |
Student exercise books, copy paper packs, test papers, certificate folders, desk planners |
| A3 Size |
297×420 mm297×420 mm |
880×297 mm880×297 mm |
9.56 g9.56 g |
￥0.1242 (~$0.0170) |
Art sketchbooks, drawing paper reams, school posters, calendars, luxury gift packaging |
Note: Film cost calculations are based on 0.04 mm0.04 mm film thickness, 0.914 g/cm30.914 g/cm3 density, and 13 RMB/kg13 RMB/kg raw material cost.
2. Machine Highlights: Engineered for Paper & Stationery Lines
- ⚙️ Non-Vacuum Mechanical Bag Opening Mechanism: Unlike conventional packaging systems that rely on vacuum suction cups (which often fail due to paper dust, static electricity, or film sticking), our machine employs a pure mechanical guide and positive mechanical wedge expansion system. This guarantees reliable, jam-free bag opening on glossy OPP, CPP, and LDPE self-adhesive bags.
- ⚙️ Gentle Flat Infeed for Paper Goods & Flat Gifts: Specially configured pushers and smooth stainless-steel transfer plates feed multi-page notebooks, single greeting cards, or loose exam sheets smoothly into the bag without bending corners, scratching delicate print surfaces, or disturbing paper collation.
- ⚙️ Automatic Release Liner Removal & Clean Disposal: The machine's mechanical gripper cleanly peels the 40 mm40 mm protective liner from the self-adhesive strip and channels it directly into an enclosed waste collector, keeping the entire packaging area free from static, sticky liner debris.
- ⚙️ Flat, Wrinkle-Free Edge Pressing & Sealing: A precision motorized roller assembly presses down the self-adhesive flap evenly across the bag width. This produces a crystal-clear, retail-grade flat seal that keeps books and gift stationery neatly compressed and protected from warehouse humidity.
- ⚙️ Fast Size Adjustment Between A5, A4, and A3: Tool-less modular guide rails allow operators to switch production setups between A5 notebooks, A4 school workbooks, and A3 art papers in minutes, meeting the high-mix, seasonal order demands of stationery manufacturers.
3. Comparison: Manual Packaging vs. Depai Auto Bagging Machine
4. Typical Application Scenarios
- Publishing & Bookbinding Factories: Bulk single or multi-pack packaging of student exercise books, coloring books, and textbooks before carton packing.
- Office Stationery & Paper Converters: Transparent retail packaging for A4 printer paper packs, presentation folders, file envelopes, and spiral notebooks.
- Gift & Greeting Card Manufacturers: Dust-proof protective wrapping for holiday cards, gift envelopes, party invitation sets, and novelty stationery packs.
- School & Exam Paper Supply Centers: Tamper-evident, waterproof packing for standardized test papers, student exam packets, and certificate diplomas.
