PVC/EPDM Rubber Roller for water retaining

Problem-Solution Intro

Eliminate Cross-Contamination in Rinsing Modules. In the rinsing and washing sections of a PCB horizontal line, the goal is simple but critical: keep the water in the tank and off the tracks. Standard low-quality rollers often warp at 50°C+, leading to “leaky” seals and chemical carry-over that kills your bath life. The SN:6-4 PVC/EPDM Hybrid Roller is the engineering answer for high-volume, reliable water retention without the premium cost of exotic polymers.

The “Why This Material” Section

The Synergy of PVC and EPDM We’ve blended the structural rigidity of PVC with the elastic sealing properties of EPDM. This combination allows the SN:6-4 to handle a constant 55°C thermal load while maintaining a tight seal against the PCB board edge.

• Optimized Grip:The EPDM component provides just enough “tack” to ensure the board doesn’t slip, even in high-pressure spray modules.
• Resistant to Weak Chemicals:Specifically formulated for developers and rinsing agents, resisting the typical hardening and cracking seen in generic rubber rollers.

Customization Capability

Built for the “Horizontal Line Footprint” We understand that every equipment manufacturer has unique tolerances. Our SN:6-4 series is fully customizable to fit your machine’s specific footprint:

• Hardness Tuning:We can adjust the Shore A hardness between 60-70 to match your board thickness and pressure requirements.
• Axis Integration:While SS304 is standard, we offer Fiberglass or Carbon Fiber axes to reduce the motor load on long conveyor sections.
• Surface Texture:Available in matte or polished finish to control water-film tension during the water-blocking process.

Main Application Scenarios

The SN:6-4 is the “seal” of the Rinsing and Cleaning sections. While PP handles the heavy acids, this PVC/EPDM hybrid is the cost-effective workhorse for Developing and Final Wash modules. It’s designed to provide a soft, compliant seal that won’t bruise the board but stays tight enough to stop water carry-over.

In PCB Developing lines, these rollers thrive in the 45°C-55°C range where generic rubbers usually harden and crack. They keep the developer chemistry in its tank and the rinse water in the next, preserving bath life. We also deploy these heavily in Industrial Glass Rinsing; the EPDM component provides just enough “tack” to grip the glass without leaving marks or “ghosting.” If you’re building a standard horizontal line and need a reliable water-block that doesn’t blow the budget on Teflon, this is the industry standard.

Technical Specification Table

Parameter	Industrial Specification
Model Number	SN: 6-4
Material Base	PVC / EPDM Compound
Temp Tolerance	55°C (Ideal for Rinsing/Developing)
Radial Runout	≤ 0.15 mm
Hardness	Shore A 60-70
Shaft Material	SUS304 / SUS316 / Fiberglass
Point of Use	Developing Line, Cleaning Section, Water Rinsing