SOSHH Zero-Reaction-Force Weighing Bellows for Loss-in-Weight Feeders

Gravimetric Feeders and the Challenge of Rigid Connection Resistance

In high-precision gravimetric loss-in-weight feeders, checkweighers, and automated packaging lines, maintaining measurement accuracy is paramount. Traditional heavy-duty flexible sleeves or stiff rubber connectors often introduce mechanical resistance. Because the sleeve must stretch and flex as the weigh hopper shifts, any residual spring-back or axial tension creates a counter-force against the load cells. This mechanical interference leads to false tare drift, fluctuating batch weights, and costly production errors.

The SOSHH PU-05-WB Weighing Bellows Solution

To eliminate load cell tare drift while ensuring absolute dust containment, SOSHH has engineered the PU-05-WB Series This architecture is specifically optimized for automated weighing and dosing environments:

1. Symmetric Sinusoidal Convolutions (Zero Resistance)

Unlike rigid straight-wall sleeves, our micro-formed sinusoidal convolutions provide a uniform, low-modulus flexing action. The sleeve stretches and compresses with near-zero axial resistance (<0.05 N/mm), ensuring the load cell measures true net material weight without mechanical distortion.

2. Ultra-Soft 0.5mm Virgin Polyether TPU

Manufactured from high-purity, plasticizer-free polyether polyurethane, the 0.5mm thin-wall profile offers maximum flexibility without sacrificing durability. It complies fully with FDA 21 CFR 177.2600 and EU 10/2011 food-contact standards, ensuring safe transfer for milk powder, fine flour, and active pharmaceutical ingredients.

3. 100% Tool-Free Quick Installation

Equipped with our signature exterior HF-welded Tool-Free Pull-Tabs  operators can unseat and replace the bellows in under 10 seconds during clean-up cycles, significantly reducing line downtime.

Seamless Integration & Custom Dimensions

SOSHH weighing bellows are engineered for direct dimensional compatibility with standard internal-grooved sanitary spigots. Whether you are retrofitting existing vibratory sifters or designing a new multi-head weighing system, our engineering team offers custom millimeter-precise fabrication with zero tooling fees.

Download our official specification sheet above, or contact our engineering division on the Contact Us

Find all load cell accuracy and hardness answers in the 【Weighing Bellows FAQ Hub】.