Benlong 
High-Precision Automatic Weighing and Packaging Machine
High‑precision automatic weighing and packaging machine with ±0.5g accuracy. Bottom support prevents bag deformation for heavy hardware. 5‑30 bags/min, film width up to 520mm, bag length adjustable via HMI or photoelectric sensor. Ideal for washers, fasteners, granules. Reduces product giveaway by 3‑8%. Optional checkweigher, coder, conveyor.
High‑Precision Automatic Weighing & Packaging Machine
Das high-precision automatic weighing and packaging machine is specifically engineered for automated packaging environments where strict weight accuracy is paramount. At its core, the machine features a high-precision weighing module that performs accurate packaging based on the actual measured weight of each product. For heavier materials, the machine incorporates a specialized bottom support structure designed to cushion the impact as material drops — ensuring the packaging bag retains its shape and remains free from deformation even under heavy load. Highly versatile and compatible with a wide range of common heat‑sealable composite films including OPP, CPP, and PE. Bag length can be adjusted directly via the display screen or precisely controlled using a photoelectric sensor to track print marks for accurate cutting. Ideally suited for hardware accessories (metal clips, washers, fasteners) and various loose granular materials.
The machine solves common packaging problems: inconsistent bag weight leads to customer disputes, heavy parts tear or stretch bags, and frequent changeover wastes time. With ±0.5g weighing accuracy, bottom support to prevent bag deformation, and flexible bag length control (screen or photoelectric), it dramatically improves packaging quality and reduces material waste. Typical output ranges from 5‑30 bags per minute depending on material characteristics.
Standard delivery: 30-45 days | ±0.5g accuracy | Bottom support for heavy loads
What Problems Does This Machine Solve?
Traditional volumetric or timing‑based packaging machines cannot guarantee consistent weight, leading to overfill (wasting product) or underfill (customer complaints). Heavy or sharp hardware parts often deform or puncture plastic bags during the drop. Frequent product changes require time‑consuming adjustments. This machine solves these issues by:
- Actual weight measurement – The high‑precision load cell measures each batch before filling, ensuring every bag meets target weight.
- Bottom support mechanism – A movable support rises to hold the bag bottom during heavy product drop, preventing stretching or tearing.
- Flexible bag length control – Adjust via HMI or photoelectric eye for print‑registered films, reducing changeover time.
High‑precision weighing module ensures every packaged unit meets exact weight specifications (accuracy ±0.5g).
Bottom support structure prevents bag stretching and deformation when packaging heavy items (e.g., metal hardware).
Bag length adjustable via display screen or photoelectric sensor for precise cutting – ideal for printed registration.
Supports OPP, CPP, PE heat‑sealable films; suitable for hardware, granular materials, snacks, and more.
Key Features & Customer Benefits
Technische Spezifikationen
| Packaging speed | 5 – 30 bags / minute (depends on material) |
|---|---|
| Packaging materials | OPP, CPP, PE heat‑sealable laminated film |
| Film width (max) | 520 mm |
| Bag length (max) | 300 mm (double‑pull; adjustable via screen) |
| Bag width range | 50 – 250 mm (changeable via bag former) |
| Metering method | Light curtain counting or straight‑rail positioning | Sealing mode | Back seal or three‑side seal |
| Seal texture | Straight‑line / cross‑hatch / flat (smooth) |
| Seal width | 10 mm (customizable) |
| Cutting method | Patterned‑edge blade or fine‑toothed blade |
Additional Specifications
| Air exhaust method | Pinhole perforation or sponge compression |
|---|---|
| Air pressure | 0.4 – 0.8 MPa |
| Voltage | 220V, 50Hz / 60Hz |
| Power | 3.5 kW |
| Optional auxiliary equipment | Checkweigher, coding machine, finished product conveyor |
Core Customer Benefits – Why Manufacturers Choose This Machine
Benefit 1: Eliminates overfill and underfill
Volumetric fillers can have ±5‑10% weight variation. This machine’s actual weighing module achieves ±0.5g accuracy, reducing product giveaway by 3‑5%. For a factory packaging 1 million bags per year, this saves tens of thousands of dollars in material cost annually.
Benefit 2: No bag deformation for heavy parts
Heavy hardware items (e.g., metal clips, washers) falling from height can stretch or puncture bags. The bottom support rises to catch the bag bottom during the drop, absorbing impact and maintaining bag shape – eliminating customer complaints about torn packaging.
Benefit 3: Fast changeover for different bag sizes
Switching between bag widths (50‑250mm) requires changing the bag former (5‑10 minutes). Bag length is adjusted digitally on the HMI – no mechanical changes. Photoelectric sensor registration ensures accurate cutting for pre‑printed film.
Benefit 4: Versatile for multiple product types
The machine handles hardware accessories (washers, clips, screws), granular materials (rice, beans, plastic pellets), and small parts. The metering system can be configured for light curtain counting (for uniform parts) or straight‑rail positioning (for free‑flowing granules).
Customer Success – Hardware Manufacturer Saves 8% in Material Cost
A hardware manufacturer packaging metal washers (500g/bag) was using a volumetric filler with ±30g variation, resulting in 6% product giveaway. After switching to this high‑precision weighing packaging machine, they achieved:
The machine paid for itself in 10 months through material savings alone.
Applications – Where This Machine Adds Most Value
Custom Engineering & Delivery
Request a Custom Weighing & Packaging Machine Quote
Send us your product samples and bag specifications. Our engineers will design a high‑precision weighing packaging machine with bottom support (if needed) – including a full ROI analysis comparing current vs. proposed packaging method.
WhatsApp: +86 150 5837 0007 | Email: xsb@benlongkj.cn | English & Chinese support
Why Choose Benlong for Weighing & Packaging?
- Mehr als 15 Jahre Erfahrung im Designbereich weighing and packaging machines for hardware and granular materials
- High‑precision weighing module (±0.5g) – reduces product giveaway
- Bottom support mechanism – prevents bag deformation for heavy loads
- Flexible bag length control – HMI or photoelectric registration
- Weltweiter Service und Ersatzteilsupport
Standardausstattung der Maschine
High‑precision load cell weighing module · Film feeding & sealing station · Bottom support mechanism · HMI touch screen · Photoelectric sensor (for print registration) · Bag former (one size) · PLC controller · Safety guarding · Operation manual · 1‑year warranty
Häufig gestellte Fragen
The high‑precision load cell achieves ±0.5g accuracy for target weights up to 1kg. For larger weights (e.g., 5‑10kg), accuracy scales proportionally but remains better than ±0.5% of target weight.
A pneumatically actuated support rises to the bag bottom just before product discharge. It holds the bag during the drop, absorbing impact and preventing stretching or tearing. After filling, it retracts for sealing. This is essential for hardware parts weighing over 500g per bag.
Yes. A photoelectric sensor detects print marks and controls bag length to ensure accurate cutting at the registered position. This is ideal for branded packaging with logos or labeling.
Standard machine supports bag widths from 50mm to 250mm. Changing bag width requires swapping the bag former (a quick‑change module). Bag length is adjustable via HMI from 50mm to 300mm.
Yes. An optional checkweigher can be installed downstream to verify bag weight after sealing. Rejected bags can be automatically diverted. The checkweigher interfaces with the main PLC for data logging.
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