Resin/Plastic

Added to bookmarks
Bookmarks list

Bookmark has been removed
Bookmarks list

You can't add any more bookmarks

By registering as a member, you can increase the number of bookmarks you can save and organize them with labels.
Free membership registration

三行合成樹脂

EstablishmentJune 1949

capital2000Ten thousand

number of employees120

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

phone0258-66-6600

Official site

last updated：Feb 26, 2026

Contact this company
Inquiry Form
Before making an inquiry
Download Profile

三行合成樹脂 Company Overview

In various shapes, as you wish.

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"

Go to product/service list

catalog（7）

Survey responses are required to view e-book details. Click to view the e-book.

Collection of Plastic Molding Examples

TECHNICAL

Contact this catalog

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

PRODUCT

Contact this catalog

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

TECHNICAL

Contact this catalog

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

TECHNICAL

Contact this catalog

Go to catalog list

news（3）

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

Added to bookmarks

Bookmarks list

Bookmark has been removed

Bookmarks list

You can't add any more bookmarks

By registering as a member, you can increase the number of bookmarks you can save and organize them with labels.

Free membership registration

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

Added to bookmarks

Bookmarks list

Bookmark has been removed

Bookmarks list

You can't add any more bookmarks

By registering as a member, you can increase the number of bookmarks you can save and organize them with labels.

Free membership registration

We will be exhibiting at the 30th Mechanical Components Technology Exhibition (M-tech).

OTHER

We are pleased to announce that we will be exhibiting at the 30th Mechanical Components Technology Exhibition (M-tech). We sincerely look forward to your visit. The Mechanical Components Technology Exhibition is one of the largest manufacturing exhibitions in Japan, part of "Monozukuri World Tokyo." 【Exhibition Overview】 Dates: July 9, 2025 - July 11, 2025, 10:00 AM - 6:00 PM (until 5:00 PM on the last day) Venue: Makuhari Messe Exhibition Booth: International Exhibition Hall 3 / Booth No. 14-32 (within the NICO joint exhibition booth No. 12) 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.

Jun 24, 2025

Added to bookmarks

Bookmarks list

Bookmark has been removed

Bookmarks list

You can't add any more bookmarks

By registering as a member, you can increase the number of bookmarks you can save and organize them with labels.

Free membership registration

Go to news list

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