CASE STUDY

Defect-Free Automotive Interiors: Custom Adhesive Lamination Solutions to Ensure Quality and Prevent Part Failures

How Shawmut's Expertise in Adhesive Lamination Resolved Manufacturing Challenges for a Leading OEM’s Pillar Program

Introduction

In the competitive world of automotive manufacturing, parts and manufacturing changes can happen fast, and even minor design changes can lead to significant production challenges. This case study highlights the collaborative efforts of Shawmut Corporation to resolve a part failure caused by a material limitation in the production of automotive interior pillars. The issue arose when a leading global automotive OEM implemented a design modification, causing their Tier 1 supplier to encounter failures in their molding process.

Shawmut’s ability to quickly diagnose the root cause, apply lessons learned from previous programs, and implement a tailored solution ensured uninterrupted production and maintained the OEM’s stringent quality standards. The project underscores Shawmut’s role as a problem-solving partner, leveraging expertise in adhesive lamination to address complex manufacturing challenges.

The Challenge

A Tier 1 supplier encountered significant issues when the OEM altered the shape of a pillar component, creating deeper draw areas in the mold. This change caused tearing during the molding process, which relied on a material with low elongation properties. The supplier’s previous transition to a hot roll lamination process further compounded the problem, as this approach lacked the flexibility required for deep-draw applications.

The Tier 1 supplier initially hesitated to move away from the hot roll process due to historical concerns with adhesive lamination. However, as launch deadlines loomed and production failures mounted, Shawmut stepped in to address the problem. The challenge was to rapidly identify the root cause, implement a solution, and gain approvals without delaying the OEM’s production timeline.

Innovative Approach

Shawmut leveraged its expertise in adhesive lamination to provide a comprehensive solution. Drawing from lessons learned in previous collaborations with the Tier 1 supplier, Shawmut identified that the hot roll process was ill-suited for the updated mold design. The team recommended returning to a TSG adhesive lamination process, which offered the necessary elongation properties to withstand the deeper draw requirements.

Key steps in the approach included:

  • Material Selection and Optimization:
    • Utilized a 130-gram, 100% PET cross-lapped spun-lace nonwoven fabric for its superior elongation properties and durability, ideal for deep draw molding applications.
    • Paired with a moisture-cure polyurethane (PUR) adhesive, renowned for its flexibility and bonding strength in automotive environments.

 

  • Applicator Design:
    • Leveraged an existing library of adhesive applicator designs to select and fine-tune a pattern that minimized risks such as adhesive push-through and orange peel textures.
    • Applied insights from previous trials to optimize performance, reducing development time and ensuring seamless integration.

 

  • Process Optimization:
    • Collaborated with the Tier 1 supplier to refine lamination techniques, ensuring compatibility with their molding processes and maintaining the visual and structural integrity of the final part.
    • Fine-tuned adhesive application to meet the stringent requirements of deep draw areas and challenging mold geometries.

 

  • Rapid Testing and Validation:
    • Conducted trials to validate elongation performance and bond strength under molding conditions.
    • Achieved OEM approval with minimal visual defects and compliance with industry standards, including IATF 16949. 

 

  • Seamless Transition:
    • Transitioned production from hot roll lamination at the Tier 1’s facility to adhesive lamination at Shawmut’s Tennessee plant within weeks.
    • Ensured uninterrupted program timelines, avoiding a potential production shutdown.

Technical Focus: Adhesive Lamination Process

Shawmut’s ability to pivot and adapt existing processes was crucial to the program’s success. The TSG lamination process involved the following considerations:

  1. Adhesive Application: Shawmut implemented a PUR adhesive known for its elasticity, which allowed for deeper draws without tearing.
  2. Equipment Calibration: Lamination equipment was adjusted to handle the unique properties of the material, ensuring uniform adhesive application and curing.
  3. Testing and Validation: Elongation properties were rigorously tested to confirm that the updated materials met the OEM’s quality standards.
  4. Rapid Deployment: Shawmut’s production team ensured a three-week turnaround for the material, meeting the program’s tight timeline.

Results and Impact

Shawmut’s solution not only resolved the immediate issue but also demonstrated the value of a flexible, expertise-driven approach to material challenges. By leveraging prior knowledge and implementing a tailored solution, Shawmut enabled the Tier 1 to meet the OEM’s quality standards and maintain the production schedule.

The transition back to TSG lamination restored the necessary material properties, allowing the updated pillar design to succeed in the molding process. This solution avoided potential shutdowns, preserved the Tier 1’s reputation, and reinforced Shawmut’s role as a trusted partner in automotive manufacturing.

Conclusion

Shawmut’s ability to diagnose and resolve complex material issues highlights the company’s commitment to innovation and customer collaboration. This case study illustrates how tailored solutions and adaptive processes can overcome manufacturing challenges, ensuring the seamless production of high-quality automotive components. As automotive designs continue to evolve, Shawmut remains at the forefront, ready to deliver cutting-edge solutions for the industry’s most demanding applications.

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Project Details

Project:

Automotive Pillars: Advanced Adhesive Solutions

Capabilities Applied/Processes:

  • Adhesive Lamination/Rotogravure
  • Rotogravure Applicator Roll
  • Hot Roll

Industry for Use:

  • Automotive

Materials Used:

  • 3 bar flat warp knit polyester fabric designed for automotive pillar trim applications
  • 130g, 100% PET Crosslap Spunlace
  • PUR Adhesive

Equipment Used:

  • TSG Adhesive Laminator

In Process Testing/Inspection Performed:

  • Elongation
  • Bond
  • Weight
  • Thickness

Width:

  • 40″

Length:

  • Continuous Rolls

Volume:

  • 45,000 linear yards annually

Standards Met:

  • Customer Requirements
  • IATF (International Automotive Task Force)

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