Trunk Style VFFS Bag Former for Powder & Liquid Packaging
Designed for Powder & Liquid Packaging, Say Goodbye to Film Jamming and Material Clogging
This specialized Bag Former, often referred to as a Sachet Packaging Machine Former, is an expert component within the VFFS (Vertical Form Fill Seal) machine family. Unlike conventional collar-type formers, it is specifically engineered to solve the packaging challenges of powders, liquids, and sauces.
Specialized Bag Former vs. Conventional Collar-Type Former
Feature | Specialized Bag Former (for Sachets) | Conventional Collar-Type Former |
Core Structure | Flexible Guide Plate + Guide Tube | Fixed Collar + Forming Tube |
Key Advantage | High Adaptability, Anti-Clogging, Anti-Jamming | Simple Structure, Lower Cost |
Applicable Materials | Powders, Liquids, Sauces, Small Granules | Solid Granules, Puffed Foods, Hardware |
Applicable Machines | DXDK series powder packers, liquid filling machines | Most general-purpose VFFS machines |
We focus on providing high-quality formers and stainless steel forming shoulder parts for our B2B partners (machine manufacturers, parts distributors, and agents), helping you overcome technical hurdles in powder and liquid packaging.
Core Functions & Design Highlights
Function | Design Highlight | Your Benefits |
Superior Adaptability | Flexible Guide Plate & Tube: Allows for slight adjustments to automatically fit different outlet diameters. | Versatility: No need to frequently change formers for minor size differences, reducing spare parts costs. High Compatibility: Easily matches various packaging machine brands. |
Ultimate Smoothness | Guide Strips Design: Ultra-low friction strips inside the former guide the film smoothly. | Eliminates Film Jamming: Ensures stable operation even with sticky or thin films, reducing downtime. |
Stable Installation | Rotary Locking Mechanism: An innovative locking system for both quick installation and absolute stability during high-speed operation. | Increased Efficiency: Reduces changeover and adjustment time by over 50%. Safe & Reliable: Prevents displacement caused by vibration. |
Smart Integration | Optional ARM Control System Interface for seamless connection with the packaging machine’s smart control system. | Enhanced Automation: Supports functions like automatic weighing, bag making, and waste discharge for truly intelligent production. |
Typical Application Scenarios
Scenario 1: Fully Automatic Powder Packaging
- Applicable Machine: DXDK series automatic weighing and packing machines
- Materials: Milk powder, coffee powder, medicinal powder, seasonings, etc.
- Pain Point Solved: The unique design uses gravity to guide materials directly into the bag, reducing dust and residue on the inner walls of the stainless steel forming shoulder.
- Packing Accuracy: Achieves packing accuracy up to ±0.1g when paired with a film pulling wheel system.
Scenario 2: Liquid/Sauce Filling
- Applicable Machine: Nasal spray filling machines, sauce packing machines
- Materials: Nasal sprays, shampoo, ketchup, salad dressing, etc.
- Pain Point Solved: The “trunk” part of this stainless steel feeding pipe tube cylinder bag former can extend into the bag for bottom-up filling, effectively preventing splashing and foaming.
- Qualification Rate: Achieves a product qualification rate of over 99% when integrated with a precise filling system.
B2B Partnership & Services
We understand the needs of B2B partners and offer the following exclusive services:
- OEM/ODM Customization: We provide full-process customization services from design to production based on your machine models and technical requirements.
- Bulk Price Advantage: The larger the order, the better the price. Inquire now for bulk discounts.
- Stable Supply Chain: We have a mature production system to ensure your orders are delivered on time, with guaranteed quality and quantity.
- Technical Support: Our engineering team provides comprehensive technical support, including selection, installation, and debugging.
How to Choose the Right Bag Former?
The key to selecting the correct former is to determine your required film width.
Calculation Formula:
Film Width = (Finished Bag Width x 2) + (Side Seal Width x 2)
Example:
- Your desired bag width is 100mm.
- The standard side seal width is typically 10mm.
- Required Film Width = (100mm x 2) + (10mm x 2) = 220mm.
- Based on the table above, you should choose the SF-M240 (200mm-240mm) bag former.
Bag Types & Customization Capabilities
This trunk-style sachet bag former is specifically designed for vertical form fill seal machines handling powders and liquids. As a flexible, tube-based forming component, it supports the following bag formats:
- 3-side seal sachets — the standard format for single-serve products
- 4-side seal sachets — for enhanced seal integrity in medical or food applications
- Back-seal stick packs — for slim single-portion packaging (sugar, salt, condiments)
Customization range:
- Film width: 35mm (min) to 800mm (max)
- Tube outlet diameter: matched to your machine’s filling nozzle
- Stainless steel flexible trunk structure — tested to 10,000+ fatigue cycles
- Custom angles, lengths, and materials on request; MOQ = 1 piece
Products This Former Is Designed For
The trunk-style bag former is the go-to solution for challenging products that traditional collar-type formers struggle with:
| Product Type | Why Trunk-Style Works Better |
|---|---|
| Powders (protein, flour, spices) | Tube extends into the bag for bottom-up fill — prevents powder splashing back onto the seal area |
| Liquids (sauces, oils, vinegar) | Eliminates foaming and splashing; keeps the seal zone clean for a 99%+ leak-free rate |
| Pastes & gels (ketchup, creams) | Smooth internal bore + short trunk length ensures complete discharge with no clogging |
| Granules (sugar, salt, coffee) | Optional for smaller-format sachet lines where precision fill matters |
If your product currently causes film contamination near the seal area, or your rejection rate is above 1%, the trunk-style former may solve the problem entirely.
Compatible Packaging Films
The trunk-style former is compatible with the flexible film types commonly used in sachet and single-serve packaging:
- Transparent PE/CPP film — standard single-serve sachets
- Aluminum foil composite film — for condiments, pharmaceuticals, or any product requiring light and moisture protection
- Kraft paper laminate — for eco-conscious brand positioning; our former surface is optimized to reduce paper drag
- Metalized OPP film — for a premium look with good barrier properties
Film width supported: 35mm to 800mm. If your film is outside the standard range listed in our spec table, contact us — full custom orders are our core strength.
- Bag Former Specifications for Sachet Machines
We offer a wide range of bag formers to suit various film widths. Below are the standard specifications for our sachet packaging machine formers.
Model (SKU) | Applicable Film Width | Recommended Bag Width Range |
FP-S090 | 50mm – 90mm | Approx. 15mm – 35mm |
FP-S140 | 100mm – 140mm | Approx. 40mm – 60mm |
FP-M190 | 150mm – 190mm | Approx. 65mm – 85mm |
FP-M240 | 200mm – 240mm | Approx. 90mm – 110mm |
FP-L290 | 250mm – 290mm | Approx. 115mm – 135mm |
FP-L340 | 300mm – 340mm | Approx. 140mm – 160mm |
FP-XL390 | 350mm – 390mm | Approx. 165mm – 185mm |
FP-XL440 | 400mm – 440mm | Approx. 190mm – 210mm |
FP-XXL490 | 450mm – 490mm | Approx. 215mm – 235mm |
Related Product
Need Custom Stainless Steel Forming Shoulder Parts?
If your film width is outside the above ranges, or if you need a custom stainless steel forming shoulder for special bag types (e.g., gusseted bags, quad-seal bags),
Please feel free to contact us.
We support fully custom orders for all types of stainless steel forming shoulder parts, starting from just 1 piece!
Are this specialized bag former and the conventional collar-type former interchangeable?
Generally, no. Their mounting bases and integration methods differ. This sachet packaging machine former is typically used for specific powder or liquid machine models, while the collar-type is more universal. Please confirm your machine type before purchasing.
What is the lifespan of the flexible structure?
We use high-quality flexible stainless steel that has passed tens of thousands of fatigue tests. Under normal use, the lifespan of the flexible structure is the same as the main body of the former, lasting at least 2-3 years.
Do you support custom, non-standard orders? What is the MOQ?
Yes, custom non-standard orders are one of our core strengths. We can meet your needs for special diameters, angles, or materials. The MOQ for standard products is 1 piece, and we welcome you to request a sample for testing.
How do I determine the correct model I need?
Simply provide your packaging machine’s brand and model, the outlet diameter, and your desired bag width and type. Our technical engineers will handle all the matching and design work for you.
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