Executive Summary: Sidewall blemishes—specifically local indentations, undulations, and air-trapping bulges—represent one of the most persistent aesthetic and quality challenges in tubeless radial tire manufacturing. This case study analyzes how a tier-1 tire manufacturer resolved critical sidewall cosmetic defects and high Radial Force Variation (RFV) scrap rates by replacing legacy overlap splicing methods with Weixin Fabric's high-precision dipped carcass fabric and advanced splicer technology.

As a specialized Chinese enterprise producing high-tenacity Nylon 6, Nylon 66, and HMLS Polyester carcass fabrics, Weixin Fabric partners with global tire makers to engineer custom reinforcement solutions that optimize ply splicing, maximize air venting, and ensure flawless sidewall surface finish.

1. Problem Definition: The Sidewall Quality Bottleneck

During automated green tire assembly, continuous carcass fabric plies are joined on the building drum. The OEM reported a 4.2% quality inspection rejection rate on high-performance Passenger Car Radial (PCR) lines due to two distinct sidewall defects:

• Radial Sidewall Indentations (Depressions): Visible vertical lines caused by excessive double-layer thickness at overlap splices, which resisted uniform radial expansion during bladder vulcanization.
• Sidewall Air Blisters: Trapped micro-air pockets between the inner liner and carcass fabric splice line that expanded into surface blisters under heat curing.

2. Engineering Intervention & Solution Design

Weixin Fabric's technical team conducted an on-site diagnostic of the calendering, dipping, and tire-building process. The engineering intervention focused on replacing rigid lap joints with precision ultrasonic butt splicing paired with Weixin Open Mesh Splicer Fabric.

3. Technical Implementation & Results Analysis

The successful outcome relied on two key technology integrations provided by Weixin Fabric:

1. Ultra-Uniform Dipped Carcass Fabric: Weixin Fabric supplied high-tenacity HMLS Polyester and Nylon 66 dipped fabrics processed with precise tension-control calendering and proprietary RFL dipping chemistry. This guaranteed high green tack auto-hesion while maintaining exact cord distribution across the joint edge.

2. Micro-Channel Air Bleeding: The open porous grid of Weixin Splicer Fabric provided active micro-venting pathways during curing bladder expansion, forcing trapped air out through mold vents before compound vulcanization.

4. Why Choose Weixin Fabric for Tire Carcass Solutions

Weixin Fabric is an established industry pioneer in automotive tire reinforcement materials in China. Our comprehensive product portfolio includes Nylon 6, Nylon 66, HMLS Polyester dipped carcass fabrics, chafer fabrics, and specialized open mesh splicer tapes.

By offering customized RFL formulation matching, precise width slitting, and advanced technical support, Weixin Fabric enables global tire manufacturers to optimize building machine productivity, reduce scrap rates, and elevate finished tire dynamic performance.

Conclusion: Achieve Defect-Free Tire Manufacturing

This case study demonstrates that advanced splicing technology and engineered carcass fabrics are essential for eliminating sidewall blemishes and optimizing radial tire quality. Partner with Weixin Fabric to upgrade your carcass reinforcement performance.

Contact our technical engineering department today for custom samples, case study technical documentation, and plant process evaluations.