Resin/Plastic

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三行合成樹脂

EstablishmentJune 1949

capital2000Ten thousand

number of employees120

addressNiigata/Mitsuke-shi/1-6-5 Sakai Town

phone0258-66-6600

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last updated：Feb 26, 2026

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三行合成樹脂 Company Overview

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Sangyo Composite Resin is a plastic injection molding manufacturer. Based on the molding know-how and infrastructure cultivated over many years, we continue to provide plastic parts to customers in a wide range of industrial sectors. ■ Supporting manufacturing with "comprehensive strength" 1. 82 electric injection molding machines (clamping force 50–650t, product weight 0.05–3500g) 2. Automated logistics warehouse with 3000 pallets 3. Human resource education (65 nationally certified molding technicians) 4. Molding technology and know-how (capable of handling general-purpose resins to super engineering plastics) 5. Management system certified with ISO9001 and ISO14001, and ISO13485 (with applicable scope) 6. Traceability (introduction of a production management system specialized for injection molding to track the routes of products, parts, and raw materials) ★★★ Announcement ★★★ We will be exhibiting at the 30th Mechanical Components Technology Exhibition (M-tech) from July 9 to 11, 2025. For more details, please check the news or announcements on our company website.

Business Activities

Manufacturing, assembly, and sales of plastic injection molded products. We collaborate with mold manufacturers from the planning and design stage to create shapes, aiming for the best product design in terms of functionality and cost. ■Main Equipment Electric injection molding machines: 83 units in total - 550-650t: 2 units - 350-450t: 10 units - 220-280t: 4 units - 180-180t: 24 units - 100-140t: 9 units - 50-85t: 34 units

Products/Services (7)

[VA Case Study] Cost Reduction through Resin Conversion of Metal Products! Plastic Molding

Please feel free to consult us about anything related to plastic molding.

[VE Case] Realization of slit width 0.1mm "Adjuster"

[VE Example] Resin Conversion of Molded Parts "Screw"

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catalog（7）

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Collection of Plastic Molding Examples

TECHNICAL

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Feel free to consult us about anything related to plastic molding.

PRODUCT

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[VE Case] Realization of slit width 0.1mm "Adjuster"

TECHNICAL

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[VE Case] Resin Conversion of Molded Parts "Screw"

TECHNICAL

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news（4）

We will be exhibiting at the 31st Mechanical Components Technology Exhibition (M-tech) in Tokyo.

OTHER

We are pleased to announce that we will be exhibiting at the 31st Mechanical Components & Materials Technology Expo (M-tech) in Tokyo. We sincerely look forward to your visit. The Mechanical Components & Materials Technology Expo is one of the largest manufacturing exhibitions in Japan, part of the "Monozukuri World Tokyo." Exhibition Overview: Dates: July 1, 2026 - July 3, 2026, 10:00 AM - 5:00 PM Venue: Tokyo Big Sight Exhibition Booth: East Exhibition Hall / Booth Number E24-38 Additionally, pre-registration is required for attending this exhibition. By registering and printing your visitor badge in advance, you can enter smoothly on the day of the event. Please use the link below for visitor registration.

Jun 22, 2026

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We will be exhibiting at the 11th Mechanical Components Technology Exhibition (M-tech) in Nagoya.

OTHER

We are pleased to announce that we will be exhibiting at the 11th Mechanical Components Technology Exhibition (M-tech) in Nagoya. We sincerely look forward to your visit. The Mechanical Components Technology Exhibition is one of the major exhibitions of "Monozukuri World Nagoya," which is one of the largest manufacturing exhibitions in Japan. 【Exhibition Overview】 Dates: April 8, 2026 - April 10, 2026, 10:00 AM - 5:00 PM Venue: Port Messe Nagoya Exhibition Booth: Hall 1 / Booth Number 4-58 Additionally, prior registration is required to attend this exhibition. By registering and printing your visitor badge in advance, you can enter smoothly on the day of the event. Please use the link below for visitor registration.

Feb 26, 2026

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We will be exhibiting at the 28th Mechanical Components Technology Exhibition (M-tech) in Osaka.

OTHER

We are pleased to announce that we will be exhibiting at the 28th Mechanical Components Technology Exhibition (M-tech) in Osaka. We sincerely look forward to your visit. The Mechanical Components Technology Exhibition is one of the largest manufacturing exhibitions in Japan, part of the "Monozukuri World Osaka." 【Exhibition Overview】 Dates: October 1 to October 3, 2025, 10:00 AM to 5:00 PM Venue: Intex Osaka Exhibition Booth: Hall 6, Zone A / Booth Number 44-21 Additionally, prior registration is required to attend this exhibition. By registering and printing your visitor badge in advance, you can enter smoothly on the day of the event.

Sep 09, 2025

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Detailed information

Company name	三行合成樹脂
number of employees	120
Contact address	postalcode 954-0104 Niigata/ Mitsuke-shi/ 1-6-5 Sakai TownView on map TEL：0258-66-6600 FAX：0258-66-6602
Key Partners	Corona Corporation Takahata Precision Japan Co., Ltd. Diamond Electronics Co., Ltd. Iseki Niigata Manufacturing Co., Ltd. Saitetsu Co., Ltd. Murata Machinery, Ltd. Meiwa Industry Co., Ltd. Wada Seiko Co., Ltd.
Industry	Resin/Plastic

三行合成樹脂 Building Image