工販 List of Products and Services

At Kōhan Co., Ltd., which operates a resin molding business in Hyogo Prefecture, we have consistently engaged in the manufacturing and sales of industrial plastic parts and rubber molded parts since our establishment. In particular, we have focused on the injection molding sector of engineering plastics, such as metal insert molding. In metal insert molding, we have conducted extensive research on technologies that enhance the bonding and strength between metal components and plastic parts, achieving the production of highly reliable products. We can accommodate a wide range of sizes, from small precision parts to large products, and we can work with almost all types of thermoplastic resins. We offer suggestions from material selection to molding methods. We have obtained ISO 9001 and ISO 14001 certifications and are committed to further improving quality. All employees are aware of the importance of quality, and we have established a thorough management system. We take environmental issues seriously and strive for eco-friendly manufacturing and sales. Moving forward, we will continue to produce high-precision products without compromising on quality, using various inspection measuring instruments. For more details, please contact us or refer to our catalog.

• Engineering Plastics

We would like to introduce a case study from Kōhan Co., Ltd., which manufactures in Hyogo Prefecture, regarding cost reduction of parts through resin molding, specifically the "injection molding of resin-cutting processed products." In addition to the product cost, there may be expenses for mold production, and issues such as warping or deformation can occur due to shrinkage after molding, which may slightly reduce dimensional accuracy. As a proposal for improvement, regarding mold production costs, it is possible to minimize expenses by selecting steel materials according to the lifetime required quantity of the product or by creating simple molds that fit into existing bases, producing molds only for the product parts. 【Case Overview】 ■ Issues - In addition to the product cost, expenses for mold production are required, and issues such as warping or deformation may occur due to shrinkage after molding, which can slightly reduce dimensional accuracy. ■ Improvement Proposal - It is possible to minimize costs by selecting steel materials according to the lifetime required quantity of the product or by creating simple molds that fit into existing bases. *For more details, please refer to the PDF document or feel free to contact us.

• Other molds

We would like to introduce a case of "insert molding" for cost reduction of parts through resin molding by Kōhan Co., Ltd., which manufactures in Hyogo Prefecture. The challenge is to change the assembly of metal parts and plug cords with resin parts to integrated molding through injection molding, thereby reducing assembly and post-processing costs. As a result, it is possible to change from assembling iron cores and resin molded parts to integrated molding of iron cores and PPS resin, as well as to use two or more types of plastic materials for integrated molding as a new molding method. [Case Overview] ■ Challenge - Change the assembly of resin parts to integrated molding through injection molding to reduce assembly and post-processing costs. ■ Result - Integrated molding of iron cores and PPS resin, as well as integrated molding using two or more types of plastic materials is possible. *For more details, please refer to the PDF document or feel free to contact us.

• Other metal materials

We would like to introduce a case of "metal resinization" regarding cost reduction of parts manufactured by Kōhan Co., Ltd. in Hyogo Prefecture through resin molding. By converting parts made of iron and aluminum into resin, we aim to achieve weight reduction and material cost compression. However, this raises concerns about the decrease in mechanical strength, reduction in heat resistance, decline in chemical resistance, and lower flame retardancy. As an improvement proposal, we can address these issues by selecting resins according to the necessary performance of the product and using enhanced grades for heat resistance, chemical resistance, and flame retardancy. 【Case Overview】 ■ Issues - Concerns about the decrease in mechanical strength, reduction in heat resistance, decline in chemical resistance, and lower flame retardancy when aiming for cost reduction. ■ Improvement Proposal - We can address these issues by selecting resins according to the necessary performance of the product and using enhanced grades for heat resistance, chemical resistance, and flame retardancy. *For more details, please refer to the PDF document or feel free to contact us.

• Steel

Kouhan Co., Ltd., which operates a resin molding business in Hyogo Prefecture, specializes in plastic injection molding and insert molding of metal fittings, and offers cost reduction proposals for parts through resin molding. For example, it is possible to reduce costs by converting metal materials such as iron and aluminum into resin, and by transforming resin-cutting products into injection molded products. In the resin conversion of metals, it contributes to cost reduction through lower material costs due to reduced prices of the materials used, and through weight reduction associated with changes in specific gravity, which lowers material and transportation costs. There have been instances where cost reductions of over 50% compared to metal parts have been achieved. **Our Strengths** - Diverse proposals utilizing advanced know-how such as engineering plastic injection molding - Capable of handling a wide range from small to large sizes with thermoplastic resins - Extensive track record from industrial machinery to the medical field - Flexible response to product development consultations, from material selection to molding method proposals *Case study explanation materials can be viewed via PDF download. Please feel free to contact us.*

• Injection Molding Machine

At Kōhan Co., Ltd., which operates a resin molding business in Hyogo Prefecture, we can produce test pieces in about three weeks based on your specifications for manufacturer, grade, and size. Additionally, prototypes can be manufactured through machining based on the test pieces. *However, the delivery time will take an additional 2 to 3 weeks. ■ Sizes: (1) 70×70mm× thickness 25mm (2) 150×150mm× thickness 10–40mm (3) 100×205mm× thickness 10–55mm The above sizes (1), (2), and (3) can be cut to your desired size. ■ Compatible Resins: PP, PE, ABS, PC, PA6, PEEK, PPS, etc. *Can also accommodate glass fillers and flame retardants. ■ Quantity: Production will be based on 25kg of material. The quantity may vary depending on the material and size. *For more details, please feel free to contact us.

• Other cutting tools

At Kōhan Co., Ltd., which operates a resin molding business in Hyogo Prefecture, we can produce test pieces in about three weeks based on your specifications for manufacturer, grade, and size. Additionally, prototypes can be manufactured through machining based on the test pieces. *However, the delivery time will take an additional 2 to 3 weeks. ■ Size: 100×100mm or smaller ■ Thickness: 3mm to 16mm ■ Compatible resins: PP, PE, ABS, PC, PA6, etc. Can also accommodate glass fillers and flame retardants ■ Quantity: As requested *For more details, please feel free to contact us.

• Other cutting tools

At Kōhan Co., Ltd., which operates a resin molding business in Hyogo Prefecture, we process industrial plastics and manufacture and sell rubber molded parts. 【Features】 ◆ Capable of handling a wide range of sizes from small precision parts to large products ◆ Can accommodate almost all types of thermoplastic resins ◆ Proven track record of supplying products to the motorcycle, industrial machinery, and medical/health-related fields ◆ One of the few companies in Japan to adopt "vertical insert molding" ◆ Sales of a wide range of rubber products including silicone rubber, urethane rubber, chloroprene rubber, and ethylene propylene rubber

• Injection Molding Machine

At Kōhan Co., Ltd., which operates a resin molding business in Hyogo Prefecture, we are engaged in the research and development of over tubes for endoscopic treatment. During the development process, we developed an extrusion molding technology that forms an independent lumen (side channel) in a spiral shape within the wall of the tube body (patent pending). Additionally, we are also challenging the establishment of a "dual-layer irregular extrusion molding technology" that features an independent lumen in the tube body, with different hardness on the inner and outer diameters. For more details, please contact us or refer to our catalog.

• others

The difficulty of insert molding due to dimensional errors arising from the conventional manufacturing process (lamination stage) of motor iron cores can be addressed by Kōhan Co., Ltd., which operates a resin molding business in Hyogo Prefecture. They can implement thin-walled integral molding using thermoplastic resins (nylon, PBT, PPS) with dedicated vertical injection molding machines. 【Features】 ◆ By using molds equipped with pressure absorption mechanisms, the variation in thickness of iron cores for motors can be minimized. ◆ Thin-walled molding with a minimum wall thickness of approximately 0.5 mm is possible for the resin parts. ◆ There are numerous achievements in producing "insulator standalone molded products" that fit into the iron cores. *For more details, please contact us or refer to the catalog.

• Other machine elements

Engineering plastics with high heat resistance and rigidity are used for industrial machine parts. Since its establishment, Kōhan Co., Ltd., which operates a resin molding business in Hyogo Prefecture, has consistently manufactured and sold industrial plastic parts and rubber molded parts. In particular, we have focused on the injection molding sector of engineering plastics, such as metal insert molding. In metal insert molding, we have conducted extensive research on technologies that enhance the bonding and strength between metal components and plastic parts, resulting in the creation of highly reliable products. We can accommodate a wide range of sizes, from small precision parts to large products, and we can work with almost any type of thermoplastic resin. We offer suggestions from material selection to molding methods. We have obtained ISO 9001 and ISO 14001 certifications and are committed to further pursuing quality. All employees are aware of the importance of quality, and we have established a thorough management system. We take environmental issues seriously and strive for eco-friendly manufacturing and sales. Moving forward, we will continue to produce high-precision products using various inspection measuring instruments without compromising on product quality. For more details, please contact us or refer to our catalog.

• Engineering Plastics

We use engineering plastics with high heat resistance and rigidity for medical peripheral device components. Kohhan Co., Ltd., which operates a resin molding business in Hyogo Prefecture, has consistently manufactured and sold industrial plastic parts and rubber molded parts since its establishment. In particular, we have focused on the injection molding sector of engineering plastics, such as metal insert molding. We offer suggestions from material selection to molding methods. In 2006, we obtained ISO 9001 and ISO 14001 certifications, further pursuing quality. All employees are conscious of quality, and we have established a thorough management system, seriously addressing environmental issues and striving for eco-friendly manufacturing and sales. We will continue to create products without compromise and produce high-precision products using various inspection measuring instruments. For more details, please contact us or refer to our catalog.

• Engineering Plastics

Our company obtained ISO 9001 and ISO 14001 in 2006 and is committed to further pursuing quality. All employees are aware of the importance of quality, and we have established a thorough management system. We are also seriously addressing environmental issues and strive for eco-friendly manufacturing and sales. Moving forward, we will continue to create high-precision products using various inspection measuring instruments without compromising on product quality.

• Engineering Plastics

Please feel free to consult us when developing new products. We will accurately grasp your needs and the ideal product image, and provide suggestions from material selection to molding methods. We also accept inquiries and development requests in fields such as medical peripheral devices and industrial machinery, as well as other product areas.

• Engineering Plastics

We manufacture and sell rubber products such as silicone rubber, urethane rubber, and butyl rubber. We provide products for packing-related and home appliance/medical-related fields.

• Engineering Plastics

Since our establishment, we have consistently engaged in the manufacturing and sales of industrial plastic parts and rubber molded parts. In particular, we have focused on the injection molding sector of engineering plastics, such as metal insert molding. In metal insert molding, we have conducted extensive research on technologies that enhance the bonding and strength between metal components and plastic parts, achieving the production of highly reliable products. We can accommodate a wide range of sizes, from small precision parts to large products, and we are capable of working with almost all types of thermoplastic resins.

• Engineering Plastics