KP Series High-Speed VFFS Packaging Machine

 Vertical form-fill-seal machine engineered for high-throughput granule, powder, and liquid packaging with unmatched speed and precision. It delivers up to 150 BPM with multi-axis servo control and PLC-driven accuracy, ensuring consistent seal quality and minimal downtime across every production run. Ideal for snack food, grain, condiment, and pharmaceutical packaging lines that demand reliability at scale.

Product Overview

The Keypack Intelligent (kunbupack) KP Series is a continuous vertical form-fill-seal machine built for modern high-speed packaging environments. Available in three models — KP-420, KP-520, and KP-620 — the series covers a wide range of bag widths from 80 mm to 300 mm, making it adaptable to diverse product formats and production scales.

At its core, the KP Series uses a Siemens PLC control system paired with a full servo drive architecture (5 servo motors per model) and a large-format color touchscreen HMI. This combination delivers exceptional control precision, intelligent fault diagnostics, and the ability to store up to 100 product recipes — so changeovers are fast and repeatable without manual re-tuning.

The machine's center-mounted fill tube and naturally counter-balanced sealing jaw system enable smooth, vibration-free operation even at maximum throughput. A stainless steel 304 frame, vacuum pull belt, short film path, and no-tool changeover former all contribute to a machine that is as easy to maintain as it is powerful to operate. The integrated intelligent temperature controller ensures precise heat sealing for both lap seal and fin seal bag styles, producing clean, flat, and aesthetically consistent seals every time.

The KP Series supports full automation: from metering and feeding, through bag forming, filling, date printing, gas flushing (optional), and finished product conveying — all completed automatically with integrated counting.

Model Specifications

Key Features and Machine Characteristics

• Multi-Axis Servo Drive System — 5 servo motors per machine deliver synchronized, high-precision motion control across all packaging axes, reducing mechanical wear and improving long-term reliability.
• Siemens PLC + Color Touchscreen HMI — Industry-standard PLC control with an intuitive large-format touch interface. Store up to 100 product recipes and switch between SKUs instantly without re-programming.
• Intelligent Temperature Control — Precision heat management ensures consistent sealing temperature across both transverse and longitudinal seals, producing flat, clean, and visually appealing fin seal or lap seal closures.
• Servo Jaw Actuation with Auto Reset Detection — Jaw position is servo-controlled and self-correcting, eliminating manual jaw adjustment and reducing film waste during startup or after a fault.
• Vacuum Pull Belt & Short Film Path — Stable film tension and a compact film routing system minimize film stretch and registration errors, especially important for printed film with eye-mark registration.
• No-Tool Changeover Former — Format parts can be swapped without tools, reducing changeover time significantly when switching between bag widths or product types.
• Quick Film Splice Table — Enables fast film roll changes with minimal line stoppage, supporting continuous high-speed production.
• Fault Display & Diagnostic System — Real-time fault codes and guided troubleshooting on the HMI help operators identify and resolve issues quickly, minimizing unplanned downtime.
• Safety Guarding — Full safety enclosures and interlocks meet enterprise safety management standards, protecting operators during high-speed operation.
• Integrated Counting & Date Printing — Automatic batch counting and date/lot code printing (thermal or laser printer optional) are built into the packaging cycle.
• Gas Flush Ready — Optional modified atmosphere packaging (MAP) capability for nitrogen or CO₂ flushing to extend product shelf life.
• Small Footprint — Compact machine layout reduces floor space requirements without sacrificing throughput, ideal for space-constrained production facilities.

Application Areas

The KP Series is optimized for free-flowing granule packaging and also handles powders and pumpable liquids across a wide range of industries:

• Snack Food & Puffed Foods: Granule-form puffed snacks, potato chips, rice crackers, and tortilla chips — high-speed back seal bag filling at up to 150 BPM for retail-ready pillow bags.
• Nuts, Seeds & Dried Fruits: Sunflower seeds, peanuts, mixed nuts, raisins, and dried berries — granule filling with accurate portion control for fixed-weight retail packs.
• Candy & Confectionery: Hard candies, gummies, jelly cups, and chocolate-coated granules — gentle filling to preserve product integrity at high throughput.
• Grain & Cereal Products: Rice, oats, muesli, and breakfast cereal granules — bulk or retail portion packing with consistent bag weight.
• Frozen & Chilled Foods: Frozen dumplings, frozen vegetables, and other IQF granule-form products — compatible with low-temperature production environments.
• Powder Products: Milk powder, instant coffee, solid beverages, protein powder, and seasoning blends — powder packaging with fin seal for airtight closure.
• Pet Food & Animal Feed: Granule-form dry pet food, kibble, and animal feed — high-volume back seal bag packing for retail and bulk formats.
• Pharmaceutical & Health Products: Solid-dose granules, herbal medicine, and nutraceutical powders — precise filling with hygienic stainless steel contact surfaces.
• Condiments & Sauces (Liquid): Soy sauce, vinegar, hot pot base (liquid/paste), peanut butter, fruit jam, shampoo, and body wash — liquid or paste filling with appropriate filler integration.
• Seasoning & Spice Blends: Granule and powder seasoning mixes, salt, sugar, and spice packets — small-format back seal bags at high speed for foodservice and retail.

Options & Customization

• Gas flush (nitrogen / CO₂ MAP packaging)
• Tear notch for easy-open bags
• Round hole or Euro hole punch for hang-sell retail display
• End-seal cooling air for improved seal integrity on heat-sensitive films
• Chain-bag (connected bag) capability
• Integration with a wide variety of fillers: multi-head weighers, auger fillers, volumetric cup fillers, liquid pumps
• Thermal or laser date/lot code printers
• Metal detectors and checkweighers (inline integration)
• Label applicators
• In-feed and take-away conveyors
• Platform and collection tables

Delivery & After-Sales Support

• Standard lead time: available upon inquiry based on model and configuration
• Factory acceptance testing (FAT) available before shipment
• On-site installation, commissioning, and operator training provided
• Spare parts package available for fast local maintenance
• Off-the-shelf standard components used throughout for easy global sourcing
• Warranty and technical support provided by Keypack Intelligent Technology Co., Ltd.

Frequently Asked Questions

Q1: The KP Series is rated at up to 150 BPM — what factors affect whether I can actually achieve that speed in production?
The 150 BPM maximum applies to the KP-420 running small-format bags with free-flowing granule products (e.g., small seeds or puffed snacks) paired with a fast multi-head weigher. Actual throughput depends on four variables: bag size (larger bags on the KP-520/KP-620 run at 130/110 BPM max), product flow characteristics (sticky, irregular, or heavy granules require slower fill cycles), filler discharge speed (the weigher or volumetric filler must keep pace with the VFFS), and film type (thicker or stiffer films need longer sealing dwell time). For most granule snack applications, 100–130 BPM is a realistic sustained production rate. We recommend sharing your product sample and target bag size so we can confirm the achievable speed for your specific application.

Q2: How long does it take to change over from one bag size or product to another, and does it require tools or specialist technicians?
The KP Series is designed for fast, tool-free changeovers. The forming tube and former collar are quick-release components that swap without spanners or special tools. Sealing jaw width adjustments are servo-controlled via the HMI — no mechanical re-spacing required. Film width and bag length parameters are recalled instantly from the stored recipe library (up to 100 recipes), so the machine re-configures itself electronically. For a trained operator switching between two pre-stored recipes with the same film width, a full changeover typically takes 15–30 minutes. Switching film width (e.g., KP-420 from 80 mm to 200 mm bags) requires a former swap and film re-threading, which adds time but remains a single-operator task.

Q3: At high speeds, how does the KP Series maintain consistent seal quality and prevent seal failures or film jams?
Seal integrity at high speed is maintained through three interlocking systems. First, the servo jaw actuation ensures the sealing jaws close with precisely controlled force and timing on every cycle — unlike cam-driven jaws, servo jaws self-correct their position and are monitored by the auto reset detection system, which stops the machine and alerts the operator if jaw position drifts. Second, the intelligent temperature controller continuously monitors and adjusts sealing bar temperature in real time, compensating for heat loss at high cycle rates to keep the seal window consistent. Third, the vacuum pull belt maintains constant, calibrated film tension throughout the forming and sealing zone, preventing film slip or misregistration that causes wrinkled or weak seals. Together, these systems allow the KP Series to sustain high-speed operation without sacrificing the seal quality required for retail-ready packaging.