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Automatic Square Curling Paper Lunch Box Forming Machine For Food Packing Bowl Tray
Description
✦ Fully Automatic · CE Certified · Factory Direct
Square Curling Paper Lunch Box Forming Machine
Precision hydraulic + servo-drive technology for consistent 3-course top curling on disposable square food containers — sushi boxes, salad bowls, takeaway trays, and more.
12–15
Pcs / Minute
250–400
g/m² Material
3-Course
Top Curl
15+
Years Factory
What Is This Machine?
The Square Curling Paper Lunch Box Forming Machine is a fully automatic production system engineered for high-volume manufacturing of disposable square paper food containers. Through an integrated sequence of automatic paper feeding → heated mold forming → triple-course top curling → counting → stacking, the entire process runs under microcomputer PLC control with minimal operator intervention.
What sets this machine apart from standard lunch box formers is its hydraulic-enhanced molding pressure system: conventional mechanical presses can leave inconsistent curl density on thick substrates, especially at corners. The hydraulic assist compensates dynamically, ensuring each box exits with the same tight, leak-resistant rim regardless of paper weight variation — critical when running PE-coated kraft paper near the upper gram limit.
⚙ Engineering Insight
The 3-course curling mechanism folds the top edge of the box three times in succession. This isn't purely aesthetic — triple-folded rims significantly improve compressive ring strength (the box resists collapsing when stacked), and the enclosed edge prevents PE delamination when the container holds hot liquids above 80°C. Single-fold machines used by lower-cost competitors produce boxes that delaminate noticeably faster in field use.
Automated Production Process — 7 Stages
Technical Specifications
| Parameter | Specification |
|---|---|
| Production Speed | 20–28 pieces / minute |
| Suitable Material | 250–400 g/m² PE-coated paper |
| Top Curl Passes | 3-course (triple-fold rim) |
| Drive System | Servo motor (high-precision positioning) |
| Molding Pressure | Hydraulic-assisted (adjustable) |
| Control System | Microcomputer PLC |
| Power Supply | 380V / 50Hz (customizable) |
| Air Source Required | 0.4–0.6 MPa compressed air (compressor sold separately) |
| Applicable Box Shapes | Square bowls, sushi boxes, sandwich boxes, disposable trays |
| Counting & Collection | Automatic (microcomputer-controlled) |
| Noise Level | ≤75 dB(A) |
| Certification | CE |
| Customization | Mold size, voltage, material range — by request |
* Actual output depends on box size and material. Full spec sheet available upon request.
6 Differentiating Features
⬡ Hydraulic Molding Assist
Dynamic hydraulic pressure compensates for paper thickness variance, delivering consistent wall height and corner definition across the entire run — critical for premium sushi and deli packaging.
⬡ Servo-Drive Precision
Closed-loop servo motor positioning eliminates mechanical cam wear, reducing downtime and maintaining ±0.2mm ejection accuracy even after thousands of operating hours.
⬡ 3-Course Triple-Curl Rim
Three sequential curl passes produce a reinforced, smooth rim that resists delamination in hot or moist conditions — standard for food-service operators requiring FDA/EU food-contact compliance.
⬡ Microcomputer PLC Control
Touchscreen interface with recipe storage. Switch between box sizes in under 15 minutes by swapping mold inserts and loading the saved parameter set — no manual recalibration required.
⬡ Energy-Efficient Design
Heating zones are independently controlled and auto-idle during stoppages. Energy consumption per 1,000 boxes is approximately 30% lower than comparable pneumatic-only machines.
⬡ Eco-Friendly Material Ready
Compatible with biodegradable PLA-coated paper and bagasse board (subject to material testing) — future-proofing your line against tightening single-use plastics regulations in EU and North American markets.
Applications & Target Products
This machine is purpose-built for square-bottomed food packaging requiring a finished, sealed rim. Common production outputs:
Sushi Boxes Salad Bowls Sandwich Boxes Disposable Square Trays Takeaway Noodle Boxes Deli Counter Containers School Lunch Trays Meal-Prep Containers Cold-Food Retail Packaging Eco Kraft Paper Bowls
How It Compares
Buyers often evaluate this machine against standard pneumatic box formers and round-tray machines. Key differentiators:
| Feature | This Machine | Standard Pneumatic Former | Round Tray Machine |
|---|---|---|---|
| Curl passes | 3-course (triple) | 1–2 course | 2-course (round) |
| Molding pressure | Hydraulic + mechanical | Pneumatic only | Pneumatic only |
| Corner consistency | ✔ High | ✘ Varies | N/A (no corners) |
| Servo drive | ✔ Yes | ✘ Cam / mechanical | ✘ Cam / mechanical |
| PLC recipe memory | ✔ Yes | Optional | Rarely |
| Eco-paper compatible | ✔ PLA / bagasse | PE only typical | PE only typical |
Frequently Asked Questions
What paper materials are compatible with this machine?
The standard configuration handles 250–400 g/m² single-side or double-side PE-coated paper. With appropriate mold and temperature calibration, it can also run PLA-coated paper and some bagasse/sugarcane fiber boards. Material samples should be tested prior to production commitment — we offer a free test-run service for qualified buyers.
Can I produce different box sizes on the same machine?
Yes. Box size is determined by the mold insert, which is changeable. The machine stores parameter recipes in PLC memory so switching sizes takes approximately 15–20 minutes for a trained operator. Multiple mold sets can be purchased simultaneously.
Do I need a separate air compressor?
Yes, the machine requires a clean, dry compressed air supply at 0.4–0.6 MPa. A standard industrial screw compressor (7.5–11 kW) is sufficient. Compressors are not included but can be sourced locally or arranged through us.
What is the installation and commissioning process?
Upon arrival, the machine requires a leveled concrete floor with load capacity ≥2T/m². Our technical team can provide remote commissioning support via video call. On-site installation by a factory engineer is available and recommended for first-time buyers — please inquire for pricing by destination country.
What after-sales support is provided?
Standard package: 12-month warranty on mechanical and electrical components, free replacement of defective parts within warranty period, 24-hour telephone/WhatsApp support, and remote diagnostic assistance. Optional: extended warranty and spare-parts kits for high-volume operations.
Is the machine compliant with EU or FDA standards?
The machine itself carries CE certification. The food-contact compliance of the finished boxes depends on the paper and coating materials used — PE-coated and PLA-coated papers meeting FDA 21 CFR or EU Regulation 10/2011 are widely available from certified paper mills.
