Keypack Intelligent WS-Series Automatic Flow Wrapper Packaging Machine
Keypack Intelligent (kunbupack) WS-Series flow wrapper packaging machine is engineered for high-speed, precision pillow bag and back-seal bag packaging across food, daily goods, and industrial applications. It delivers 40–180 bags/min (WS-350DSF) or 5–20 m/min (WS-450XDSF) with triple servo motor control and PLC automation, ensuring zero-waste film cutting and consistent seal quality. Ideal for biscuits, rice crackers, egg yolk pies, chocolate, bread, instant noodles, mooncakes, daily consumer goods, hardware tools, and regular-shaped industrial parts.
Product Overview
The WS-Series horizontal flow wrapping machine is a fully automatic packaging solution designed for regular-shaped solid products. Available in two configurations — the WS-350DS (film width up to 340 mm, bag width 30–160 mm, bag length ≥90 mm) and the WS-450XD (film width up to 440 mm, bag width 80–200 mm, bag length ≥150 mm) — the WS-Series covers a wide range of product sizes and packaging demands.
Both models feature PLC control with a bilingual HMI touchscreen interface, making operation intuitive for operators at all skill levels. The triple servo motor drive system ensures precise bag-length setting with no idle film waste — set the length, cut immediately, no adjustment runs needed. The machine supports pillow bags, back-seal bags, and perforated bags, with optional gas flushing available per customer requirements.
Machine Specifications — WS-350D
- Film Width: Max. 340 mm
- Bag Length: ≥90 mm
- Bag Width: 30–160 mm
- Roll Diameter: Max. 320 mm
- Product Height: Max. 60 mm
- Speed: 40–180 bags/min (subject to actual conditions)
- Power: 2.4 KW
- Power Supply: AC 220V 50Hz, 2-phase
- Weight: 380 KG
- Dimensions: L3744 x W800 x H1100 mm
- Control: PLC + Bilingual HMI Touchscreen
Machine Specifications — WS-450XD
- Film Width: Max. 440 mm
- Bag Length: ≥150 mm
- Bag Width: 80–200 mm
- Roll Diameter: Max. 320 mm
- Product Height: Max. 80 mm
- Speed: 5–20 m/min (subject to actual conditions)
- Power: 2.8 KW | AC 220V 50Hz
- Weight: 600 KG
- Dimensions: L3718 x W845 x H1400 mm
- Control: PLC + Bilingual HMI Touchscreen
Key Features and Machine Characteristics
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Triple Servo Motor Drive + PLC Control: Bag length is set and cut in one step — no idle runs, no film waste, no manual adjustment. Saves time and packaging film cost from day one.
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Fiber-Optic Auto-Sensing Feed: The machine automatically starts packaging when product is detected and enters standby when the line is empty — reducing operator intervention and preventing empty-bag output.
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Self-Diagnostic Fault Display: Built-in fault self-diagnosis with clear on-screen fault codes. Operators can identify and resolve issues at a glance, minimizing unplanned downtime.
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High-Sensitivity Photoelectric Eye Color Mark Tracking: Digital input for seal-cut position with high-sensitivity color mark detection ensures accurate, consistent seal placement on every bag — critical for printed film alignment.
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Independent PID Temperature Control: Each sealing zone uses independent PID temperature regulation, adapting precisely to different packaging film materials (OPP, CPP, PE, POF, etc.) for reliable seals across material types.
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Positioning Stop — No Film Sticking, No Waste: The machine stops at a defined position every time, preventing the sealing jaw from sticking to the film and eliminating film waste at shutdown.
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Simplified Drive System: A streamlined mechanical transmission design reduces failure points, improves operational reliability, and makes routine maintenance and cleaning faster and easier.
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Software-Driven Control Architecture: All machine functions are implemented in software, enabling easy parameter adjustment and future feature upgrades without hardware changes — the machine stays current as your production needs evolve.
Application Areas
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Food — Baked & Snack: Biscuits, crackers, puffed rice crackers, snow crackers, egg yolk pies, wafers, cookies — pillow bag wrapping for individual or multi-pack units
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Food — Confectionery & Chocolate: Chocolate bars, candy bars, individually wrapped chocolates — back-seal or pillow bag with optional gas flushing for freshness
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Food — Bread & Pastry: Sliced bread, buns, toast, mooncakes — flow wrapping for single-piece or tray-loaded products
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Food — Instant & Convenience: Instant noodle blocks, instant rice, compressed biscuits — high-speed pillow bag packaging for retail and export
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Daily Consumer Goods: Soap bars, wet wipes packs, tissue packs, personal care items — back-seal or pillow bag for regular-shaped consumer products
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Hardware & Industrial Parts: Screws, bolts, small tools, electronic components — individual or batch flow wrapping for retail display or bulk shipment
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Fresh Produce & Trays: Vegetable trays, fruit cartons, foam-tray packed produce — overwrapping for supermarket-ready presentation
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Note: Suitable for regular-shaped solid products. Not recommended for loose powders, liquids, or highly irregular-shaped items without a dedicated tray or carrier.
FAQs
Q1: What bag types does the WS-350DS / WS-450XD support, and can it do gas flushing?
The WS-Series supports pillow bags, back-seal bags, and perforated bags. Gas flushing is available as an optional configuration — please specify your requirement when ordering so the machine can be configured with the appropriate gas-flushing module.
Q2: How does the triple servo motor system eliminate film waste compared to traditional single-motor machines?
Traditional single-motor flow wrappers require multiple idle test runs to calibrate bag length after a changeover, wasting film and time. The WS-Series triple servo system allows the operator to input the target bag length directly on the HMI — the machine cuts at the exact set length from the first bag, with no idle runs and no wasted film.
Q3: What packaging film materials are compatible with the WS-Series machines?
The independent PID temperature control on each sealing zone allows the machine to adapt to a wide range of heat-sealable films, including OPP, CPP, PE, POF (polyolefin shrink film), and composite laminated films. The optimal temperature range depends on the specific film supplier and thickness — the machine's digital temperature setting makes fine-tuning straightforward.
Q4: What is the changeover time when switching between different product sizes or bag lengths on the WS-350DS / WS-450XD?
Changeover time varies by the degree of size difference, but the servo-driven bag-length setting significantly reduces adjustment time — operators simply enter the new bag length on the touchscreen. For film roll changes and mechanical guide adjustments (width, height), typical changeover takes 15–30 minutes depending on operator experience. The bilingual HMI and simplified drive system further reduce the learning curve for new operators.
