FDA-Grade Solid Silicone Bouncing Balls for Rotary Screen Sieving

Industry & Application Overview

Rotary and vibrating screens separate powders and granules by particle size across food processing, pharmaceutical, mineral and chemical production. On fine-mesh screens, particles and moisture build up in the apertures - a condition called blinding - which reduces throughput and product quality. Solid bouncing balls placed in the sieve tray strike the mesh from below as the machine vibrates, continuously knocking blinded particles loose and keeping open area available. The ball material must be tough, elastic and, for food and pharma lines, hygienic and regulatory-compliant.

Dongguan Yunze Silicone Products Co., Ltd. molds solid silicone bouncing balls in FDA-compliant compounds for sieving equipment manufacturers and end users worldwide.

Engineering Challenge & Pain Points

A food-ingredient processor running rotary sifters on fine flour and sugar had persistent screen blinding. Their previous balls, molded from a low-grade rubber, failed quickly:

• Rapid wear: balls lost mass and flattened within 6-8 weeks, reducing impact energy.
• Contamination risk: the rubber crumbled at the edges, releasing fragments into food product.
• Hygiene compliance: the material lacked the food-contact documentation the customer's auditors required.
• Poor rebound: balls absorbed energy instead of bouncing, so blinding returned within minutes.

Yunze Silicone Custom Solution & Material Selection

Yunze specified a solid silicone compound with a high rebound resilience and food-contact compliance, then tuned hardness to match the customer's amplitude and mesh tension.

• Food-grade, FDA 21 CFR 177.2600 compliant silicone compound.
• High rebound resilience (greater than 55 %) so balls return energy to the mesh.
• Shore A hardness options from 30 to 70 to suit different screen loads.
• Solid molded construction - no hollow core that could trap product or fail.
• Smooth, non-porous surface that resists bacterial adhesion and cleans easily.

Technical Specifications

Quantified Performance Results & Benefits

• Screen blinding reduced dramatically; open screen area maintained above 90 % during shift runs.
• Ball service life extended from 6-8 weeks to over 9 months - roughly a 5x improvement.
• Zero foreign-object contamination incidents during a 12-month trial.
• Sifting throughput restored to design capacity, avoiding a costly screen replacement.
• Food-contact documentation supplied, satisfying the customer's hygiene audit.

Technical FAQ

Q: Are your bouncing balls safe for food and pharmaceutical sieving?
A: Yes. We mold balls from FDA 21 CFR 177.2600 compliant silicone and can supply material certificates. Platinum-cured options are available for the most demanding hygiene programs.

Q: How do I choose the right ball diameter and hardness?
A: As a rule, ball diameter should be a little larger than the mesh aperture, and hardness should match your screen amplitude. Share your machine and mesh data and Yunze will recommend a specification.

Q: Can balls be supplied in custom sizes and colours?
A: Yes. We produce diameters from 10 mm to 60 mm, in custom hardness and colour, with tooling typically ready in 7-12 days.

Engineering Consultation & Sample Request

Stop losing throughput to blinded screens. Send your mesh size, machine frequency and product data to Dongguan Yunze Silicone Products Co., Ltd., and we will recommend a ball specification and ship free samples for an on-machine trial.