Automatic Snap Band Welding Machine — Upgrading from Riveted Fastening to Rivet-Free Metallurgical Joining
The KABORY Automatic Snap Band Welding Machine is specially developed for the high-volume production of elastic snap bands used in industrial dust filter bags.
The machine eliminates conventional rivets and directly joins the two ends of stainless steel strip through automatic length measurement, cutting, positioning, and welding. Only one operator is required during normal production, significantly improving production efficiency, ring dimensional consistency, and the standardization of filter bag top construction.
However, the quality of a snap band is not determined solely by whether its joint is securely welded.
What truly determines installation quality and long-term sealing performance is whether the snap band can recover to a regular circular shape after being flattened and maintain stable, uniform clamping force inside the tube-sheet hole.
KABORY therefore provides more than an individual welding machine. We provide a complete snap band production system consisting of:
- Automatic Snap Band Welding Machine
- KABORY high-elasticity stainless steel strip
- Proven welding parameters matched to the strip material
What Is an Automatic Snap Band Welding Machine?
An automatic snap band welding machine is a specialized system for producing elastic snap bands, sealing rings, and snap band rings for industrial dust filter bags.
The operator feeds a coil of stainless steel strip into the machine and enters the required ring circumference through the control interface. The machine then runs automatically according to the programmed parameters.
The machine automatically performs:
- Stainless steel strip feeding
- Automatic length measurement
- Cutting to the programmed length
- Overlapping of the two strip ends
- Automatic joint positioning
- Automatic welding
- Finished ring discharge
- Production quantity counting
Because the stainless steel strip must still be threaded into the machine manually before production begins, we accurately define it as an “Automatic Snap Band Welding Machine,” rather than a “Fully Automatic Welding Machine.”
Why Replace Traditional Riveting with Welding?
Traditional snap band production generally involves several separate processes, including strip cutting, hole punching, rivet placement, and riveting.
Although this method can meet basic production requirements, several problems may occur during continuous high-volume production:
- Inconsistent rivet-hole positions
- Missing or loose rivets
- Uneven overlap between the two strip ends
- Local protrusion around the riveted joint
- Variation in finished ring circumference
- Unstable efficiency caused by manual operation
- Continuous rivet purchasing and consumable costs
The automatic welding process eliminates both punching and riveting. It directly joins the two strip ends through metallurgical bonding, upgrading snap band production from conventional mechanical fastening to rivet-free joining.
No Hole Punching
No holes need to be punched into the stainless steel strip before welding. This preserves the structural integrity of the strip and avoids localized stress concentration around rivet holes.
No Rivet Consumables
The machine does not require the continuous purchase, storage, or replenishment of rivets. It also eliminates problems caused by missing rivets, incorrect rivet specifications, and rivet-feeding failures.
More Consistent Dimensional Control
The machine automatically feeds, measures, cuts, and positions the strip according to the programmed circumference. The target overlap alignment accuracy can reach ±0.3 mm, helping reduce dimensional variations caused by manual measurement and riveting.
Designed for Continuous Production
Traditional riveting involves several independent operations. The automatic welding machine integrates feeding, measuring, cutting, positioning, and welding into one continuous production process requiring only one operator.
Welding Strength Is a Safety Foundation, Not the Core Performance of a Snap Band
The welded joint must have sufficient strength to ensure that the snap band does not separate during flattening, transportation, or installation.
In a comparison using stainless steel strips of the same hardness:
- A 0.45 mm riveted strip achieved an ultimate tensile load of approximately 4,200 N
- A 0.40 mm welded strip achieved an ultimate tensile load of approximately 7,200 N
Even though the welded strip was thinner, its tested strength was approximately 71% higher.
Riveted samples generally failed through rivet pull-through or tearing around the rivet hole. Under high loads, welded samples mainly exhibited elongation of the stainless steel base material. This indicates that the welded joint already provides a sufficient safety margin.
However, a filter bag snap band is not normally subjected to such extreme tensile loads in actual service. Pursuing a higher ultimate breaking load alone therefore has limited practical value.
For a snap band, joint strength is the safety foundation. Elastic clamping force and shape-recovery performance are what determine its actual operating quality.
Elastic Clamping Force Is What Truly Matters
During filter bag installation, the snap band is normally flattened before being inserted into the tube-sheet hole. Once released, it must immediately recover to a regular circular shape and create continuous, uniform sealing pressure between the filter bag cuff and the tube sheet.
A genuinely high-quality snap band should provide:
- Stable elastic clamping force
- Recovery to a regular circular shape after flattening
- Resistance to permanent deformation
- Resistance to becoming oval
- No localized warping
- No cracking during a 180° bend test
- Stable spring-back performance during long-term service
- Consistent circumference and roundness
If the strip is too soft, the ring may not provide sufficient clamping force even when the joint is extremely strong. If the strip is too hard or brittle, it may crack during flattening, bending, or installation.
Snap band quality must therefore not be judged by hardness or welding strength alone. Material toughness, elastic recovery, resistance to permanent deformation, and long-term clamping stability must all be evaluated together.
The Machine Must Be Used with KABORY High-Elasticity Stainless Steel Strip
The KABORY Automatic Snap Band Welding Machine must be used together with our specially developed high-elasticity stainless steel strip.
Even when stainless steel strips from different suppliers are identified as the same grade—such as SUS301, SUS316, or SUS316L—there may still be significant differences in:
- Chemical composition
- Cold-working condition
- Hardness
- Toughness
- Electrical conductivity
- Elastic recovery
- Dimensional tolerances
Using an untested third-party strip may result in:
- Unstable welding strength
- Incomplete or overheated welds
- Brittleness or cracking around the welded area
- Inconsistent weld color
- Frequent welding parameter adjustments
- Permanent deformation after flattening
- Oval or locally warped finished rings
- Reduced long-term clamping force
- Unstable continuous machine operation
For these reasons, the machine is not recommended for use with third-party stainless steel strips that have not been tested and approved by KABORY.
KABORY SUS301 High-Elasticity Stainless Steel Strip
KABORY’s specialized SUS301 stainless steel strip has a Vickers hardness of approximately 600 HV and achieves a controlled balance between high hardness, good toughness, and stable elastic recovery.
The strip can withstand repeated bending during filter bag production, flattened packaging, transportation, and on-site installation. After being flattened and released, the snap band quickly recovers to a regular circular shape without easily developing permanent deformation, ovality, or localized warping.
This reliable shape-recovery performance allows the snap band to maintain continuous and uniform clamping force inside the tube-sheet hole, improving the long-term sealing stability of the filter bag cuff.
For most industrial dust collection applications, particularly high-temperature filter bags, high-elasticity SUS301 stainless steel is the preferred snap band material.
SUS316 and SUS316L Stainless Steel Strips
For flue gas desulfurization and denitrification systems, chemical plants, high-humidity applications, and corrosive gas environments, SUS316 or SUS316L stainless steel may be selected according to the actual temperature, humidity, and gas composition.
Compared with SUS301, SUS316 and SUS316L provide better corrosion resistance, but their hardness, elastic recovery, and welding parameters must be matched separately.
KABORY evaluates strip thickness, hardness, chemical composition, spring-back performance, and welding results together, rather than determining suitability from the stainless steel grade alone.
Suitable for Premium Filter Bags with Two- to Three-Year Warranties
For standard filter bag projects, the snap band may only need to meet the initial installation requirements.
For premium filter bags carrying a two- or three-year warranty, especially high-temperature filter bags, the snap band must also withstand:
- Long-term temperature fluctuations
- Compression during transportation and storage
- Repeated deformation during installation
- Continuous pressure from the tube-sheet hole
- Vibration during operation
- Material performance changes under high temperatures
If the strip develops permanent deformation after flattening or gradually loses its spring-back force, the filter bag cuff may lose its stable clamping pressure even if the welded joint remains intact. This can increase the risk of dust leakage or filter bag detachment.
For filter bags with long warranty periods, a properly matched high-elasticity stainless steel strip is therefore more important than merely increasing the joint’s ultimate tensile strength.
Reference Production Speed
| Snap Band Diameter | Reference Production Speed |
|---|---|
| Ø90–200 mm | Approximately 8 pcs/min |
| Ø205–300 mm | Approximately 7 pcs/min |
| Ø305–400 mm | Approximately 6.3 pcs/min |
Actual production speed may vary depending on strip width, thickness, hardness, ring diameter, and welding parameters.
Only one operator is required during normal production.
Verified Continuous Production at a French Filter Bag Factory
The KABORY Automatic Snap Band Welding Machine has already been installed and operated at a filter bag manufacturing plant in France.
The production specifications were:
- Snap band diameter: Ø125 mm
- Strip width: 30 mm
- Strip thickness: 0.40 mm
- Material: KABORY matched high-elasticity stainless steel strip
The machine operated continuously for two hours and produced approximately 800 welded rings, achieving an average production speed of around 8.9 pieces per minute. A total of 1,000 finished rings were subsequently completed during production and operator training.
This was not a short machine demonstration. It was a continuous production run using the customer’s actual product specifications, verifying the machine’s production speed, welding stability, and dimensional consistency.
Welding Process vs. Riveting Process
| Comparison | Traditional Riveting | KABORY Automatic Welding |
|---|---|---|
| Joining method | Mechanical fastening with rivets | Direct metallurgical joining |
| Hole punching required | Yes | No |
| Rivets required | Yes | No |
| Main load-bearing area | Rivet and rivet hole | Welded area and base material |
| Typical failure mode | Rivet pull-through or hole tearing | Base-material elongation under high load |
| Circumference control | Easily affected by manual operation | Automatic measuring and cutting |
| Overlap positioning | Manual | Automatic |
| Operators required | Multiple manual processes | One operator |
| Long-term consumables | Continuous rivet consumption | No rivet consumables |
| Strip requirement | Conventional riveting strip | KABORY high-elasticity strip |
| Automation capability | Relatively low | Suitable for continuous production |
Integrated Quality Control from Machine to Material
Before delivery, KABORY uses the matched stainless steel strip to establish the welding program and perform continuous production testing.
The testing process covers more than joint strength. It also includes:
- Automatic strip-feeding stability
- Cut-length consistency
- Overlap-position accuracy
- Weld color and joint appearance
- 180° bend resistance
- Snap band flattening test
- Round-shape recovery after release
- Permanent deformation inspection
- Continuous production stability
Only when the machine, welding program, and strip material are properly matched can consistent joint quality, ring dimensions, elastic recovery, and production speed be maintained over the long term.
Who Is This Machine Designed For?
The KABORY Automatic Snap Band Welding Machine is suitable for:
- Industrial dust filter bag manufacturers
- High-temperature filter bag manufacturers
- Factories producing snap band filter bags in large quantities
- Manufacturers providing two- to three-year product warranties
- Companies seeking to reduce labor and rivet costs
- Production lines requiring consistent filter bag cuff dimensions
- Manufacturers building standardized automated filter bag production systems
- Customers producing SUS301, SUS316, or SUS316L snap bands
Why Choose KABORY?
KABORY has long focused on industrial filter bag production equipment and automation solutions.
Our equipment is not developed merely to replace one manual operation. It is engineered around actual filter bag manufacturing and installation requirements, taking into account:
- Stainless steel strip properties
- Elastic clamping force
- Welding strength
- Finished ring dimensions
- Filter bag cuff construction
- Long-term operating stability
KABORY can provide:
- Automatic Snap Band Welding Machines
- Matched high-elasticity stainless steel strips
- Stainless steel strip slitting machines
- Hydraulic snap band flattening machines
- Automatic filter bag cuff forming and sewing equipment
- Automatic filter bag tubing lines
- Needle-hole sealing equipment
- Integrated filter bag manufacturing solutions
By controlling the equipment, materials, and process parameters as one system, manufacturers can establish a standardized production process covering strip slitting, snap band welding, flattening, and filter bag cuff sewing.
From Mechanical Fastening to a Complete Snap Band Production System
Traditional riveting solves the basic problem of fastening two strip ends together.
The KABORY Automatic Snap Band Welding System goes further by addressing production efficiency, dimensional consistency, joint stability, elastic recovery, and long-term sealing performance.
The welded joint prevents separation, while the high-elasticity stainless steel strip maintains long-term clamping force. Only when the machine, strip, and welding parameters are properly matched can a truly stable and reliable filter bag snap band be produced.
The purchase price affects your business once. Production performance affects your profitability every day.
To confirm the correct production solution, please provide KABORY with:
- Required snap band diameter or circumference
- Stainless steel strip width and thickness
- Filter bag material
- Filter bag cuff construction
- Operating temperature
- Flue gas and corrosion conditions
- Estimated daily production quantity
- Required product warranty period
KABORY will match the automatic welding machine, specialized stainless steel strip, and welding parameters according to the actual filter bag structure and operating conditions.