1.5-Fold Bellows Suction Cup Selection Guide: Engineering Analysis of Common 1.5-Fold Bellows Geometries
Including engineering references to commonly used geometry designations such as FSGA.
In modern factory automation, packaging logistics, and high-speed transfer lines, workpieces are rarely perfect—they frequently present slight surface curvatures, height tolerances, or angular misalignments. Under these demanding conditions, conventional flat suction cups often fail due to improper sealing and subsequent vacuum leakage.
To address this, 1.5-fold bellows suction cups have become the industry standard. Among the 1.5-fold bellows geometries commonly encountered in industrial automation are designations such as FSGA, which are used by their respective manufacturers for product identification. However, as modern production facilities demand superior wear-resistant elastomers and optimized Total Cost of Ownership (TCO), identifying high-efficiency engineering-compatible solutions has become a key priority for engineering teams.
This article provides a technical teardown of the geometric mechanics and flow characteristics of the FSGA series and introduces euroTECH handling’s BLSB D Series of 1.5-fold bellows suction cups—engineered to provide compatible interface geometry for many existing industrial vacuum handling applications.
1. Technical Analysis of Common 1.5-Fold Bellows Geometry
The reputation of the 1.5-fold bellows cup as the “all-rounder” of factory automation stems from its specialized physical geometry:
- Exceptional Height & Angular Compensation: When robotic placement tolerances vary slightly or workpieces feature uneven topographies, the 1.5-fold corrugated bellows structure acts as a built-in mechanical spring upon contact. It dampens vertical impact forces—protecting fragile components like thin glass or electronics—and adapts seamlessly to minor angular variations.
- Optimal Balance Between Rigidity and Cycle Times: Compared to multi-fold (2.5-fold or greater) configurations, a 1.5-fold suction cup encloses a significantly smaller dead volume. This enables rapid vacuum evacuation times, supporting ultra-high cycle frequencies. Concurrently, the 1.5-fold profile maintains higher shear rigidity during high-speed lateral robotic movements, eliminating unwanted cup deflection or “fish-tailing.”
- Compliant Sealing Lip: The ultra-flexible outer perimeter molds tightly against micro-rough surfaces, such as corrugated cardboard or textured injection-molded plastics, helping achieve a reliable seal.
2. The euroTECH Solution: BLSB D Series 1.5-Fold Bellows Cups
To carve out a high-value technological niche within a standard commodity market, euroTECH handling engineered the BLSB D Series to strict European manufacturing tolerances. This series is designed around commonly adopted industrial interface dimensions while introducing critical, value-added engineering upgrades:
■ Premium Polyurethane (PU) Formulations for Extreme Wear Life
Conventional rubber bellows subjected to high-frequency pick-and-place cycles experience intense alternating stresses along their hinges (crests and troughs), which can lead to premature fatigue cracking. Additionally, abrasive cardboard dust or plastic flashing can degrade sealing lips rapidly.
- The euroTECH Advantage: Beyond standard NBR and FDA-compliant silicones, our BLSB D series features a premium, proprietary Polyurethane (PU) formulation. euroTECH’s specialized PU provides superior tear strength and low abrasive wear-rates. In high-friction logistics sorting or high-temperature injection molding demolding. Under appropriate operating conditions, the specialized PU formulation may significantly extend component service life, helping reduce unscheduled downtime.
■ Anti-Collapsing Geometric Support Under High Vacuum
When standard large-diameter bellows cups are subjected to deep vacuum levels, the cup body can over-retract or collapse inward. This structural failure causes the workpiece to strike the internal fitting or narrows the effective suction area.
- The euroTECH Advantage: Larger configurations within the BLSB D series feature an optimized interior geometric reinforcement. Even under deep vacuum levels (e.g., −0.7bar to −0.8bar), the bellows maintains a stable geometry to support predictable lifting performance under high vacuum conditions and dynamic stability.
■ Two-Piece Modular Base System (Maximizing TCO)
- The euroTECH Advantage: Aligned with euroTECH’s principles of resource efficiency and cost control, the BLSB D series features a modular split-design separating the metal fitting connection from the elastomer body. During routine maintenance intervals, technicians do not need to disconnect vacuum lines or scrap the entire unit; they simply swap out the lower rubber bellows cup, helping reduce recurring consumable expenditure.
3. Technical Specifications & Engineering Geometry Reference
The table below provides an engineering reference for commonly used 1.5-fold bellows geometry designations together with the corresponding EUROTECH product series. Final dimensional suitability should always be verified during engineering evaluation.
| Common Geometry Designation | euroTECH Upgrade Model | Outer Diameter (∅) | Bellows Stroke (Stroke) | Value-Added Advantage |
|---|---|---|---|---|
| 33 | euroTECH BLSB 37D | 33 mm | ~ 8.0 mm | Available in high-durability NBR/Silicone; optimized for high-speed packaging. |
| 43 | euroTECH BLSB 43D | 43 mm | ~ 10.0 mm | Enhanced corrugated rigidity prevents slippage under high dynamic loads. |
| 53 | euroTECH BLSB 53D | 53 mm | ~ 13.0 mm | Optional premium PU elastomer radically reduces OEE replacement frequency. |
| 78 | euroTECH BLSB 80D | 78 mm | ~ 21.0 mm | Heavy-duty internal structural reinforcement prevents vacuum collapse. |
(Technical Note: To verify specific upper connection threads—such as G1/8″, G1/4″, male, or female thread layouts—euroTECH provides full 2D/3D CAD models available for direct download to assist your engineering design team.)
4. Conclusion: Optimizing Your Automated Material Handling Performance
In today’s highly competitive industrial landscape, component reliability directly governs Overall Equipment Effectiveness (OEE).
If your facility cycles through high volumes of 1.5-fold bellows cups and you are facing accelerated wear-and-tear, long overseas supply lead times, or the need to trim your annual maintenance budget, euroTECH handling’s BLSB D Series provides an engineering option for facilities seeking improved durability, modular maintenance, and application-specific material selection. We combine tier-one technical performance with a highly efficient modular design. Beyond standalone components, we offer comprehensive system diagnostics to optimize your facility’s vacuum line flow and energy efficiency.
To request free product samples of the BLSB D series for live line-testing or to obtain precise specifications, please contact the euroTECH engineering team today.
【Trademark Disclaimer】
FSGA is a trademark or product designation of its respective owner, including J. Schmalz GmbH. The use of this trademark is nominative only and solely for engineering identification and compatibility discussion. It does not imply any commercial relationship with, endorsement by, or affiliation with the trademark owner. EUROTECH is an independent manufacturer. Any references to dimensions, geometry, or compatibility are provided only to assist engineering evaluation and do not constitute a representation of OEM equivalence or product certification.