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