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  6. Sealing with insert molding! Improving adhesion between metal and resin.

Sealing with insert molding! Improving adhesion between metal and resin.

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last updated:Jul 25, 2025

不二精工
不二精工
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A must-see for development personnel aiming for efficiency! Achieving high adhesion and airtightness by using special elastomers.

This document contains information on "Technology for Improving Adhesion Between Metal and Resin." In insert molded products, the interface between metal and resin is not well adhered, leading to issues such as water ingress due to high pressure during car washes and condensation in the vehicle's engine compartment. To address this, our company improves the adhesion between metal and resin through the following dual molding process: - Using elastomer (a special material rich in adhesion) in the primary molding - Joining metal and resin through heat and thermal treatment in the secondary molding We conduct air leak evaluation tests. You can view the test details by downloading the PDF, so please feel free to take a look. [Contents Included] - Concept of dual insert molding line - Evaluation tests for "Adhesion Improvement" technology - Pursuit of "Adhesion Improvement" technology - Towards the establishment of "Adhesion Improvement" technology - Investigating causes and extracting issues for "Establishment" *For more details, please refer to the PDF document or feel free to contact us.

    Waterproof ConnectorCouplingElectrical equipment parts
密着性向上技術ポスター.jpg

Sealing with insert molding! Improving adhesion between metal and resin.

密着性向上技術ポスター.jpg
密着性向上技術ポスター.jpg 封止イメージ.jpg
  • Related Link - http://www.fuji-seiko.com/
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Technical Documentation on Improving Adhesion between Metal and Resin

Technical Documentation on Improving Adhesion between Metal and Resin

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Announcement of participation in 'Manufacturing Technology 2026 for Realizing Value-Added Design' on June 11, 2026 (Thursday)

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Fuji Seiko Co., Ltd. will be exhibiting at the "Manufacturing Technology 2026 for Realizing Value-Added Design" held at the Tokyo Metropolitan Industrial Trade Center Hamamatsucho Hall, 3rd Floor Exhibition Room. This is a technical exhibition and consultation event for professionals in product planning, product design, research and development, and engineering. We plan to conduct evaluation test demonstrations of our "Metal and Resin Adhesion Improvement Technology," as well as display samples summarizing the usage examples and technologies of press products and insert molded products. We sincerely look forward to your visit.

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不二精工

不二精工

Resin/Plastic

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Our corporate philosophy is to "be of service to our customers, employees, shareholders, business partners, and the local community." With the desire to be of help to everyone, and to contribute to the creation of a society where people can live safely and happily, we are engaged in addressing environmental issues. The responsibility of human society towards environmental issues is significant, and this is a role that humanity must fulfill. We sincerely acknowledge the various problems surrounding the global environment, and we will take maximum care to minimize the environmental impact arising from all our activities, while working to prevent environmental pollution. In March 2004, in addition to our commitment to quality, we also obtained certification for the international environmental standard "ISO 14001." Moving forward, we will continue to make further efforts in environmental improvement activities, striving to contribute to the preservation of the global environment.

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