大和合成 Product Lineup

This is a resin pulley with a proven track record as an automotive part. A pulley is a component that engages with the belt transmitting the engine's rotation. It is used for adjusting the position and tension of the belt. By using thermosetting resin, we have improved heat resistance and oil resistance. By serving as a substitute for traditional metal pulleys, it significantly contributes to weight reduction. Additionally, compared to metal pulleys, it features less vibration during operation and reduced noise. For pulleys with complex shapes, such as those with grooves, there is a cost reduction effect. 【Specifications】 ○ Material: Engineering plastic ○ Lot: 1 to no upper limit ○ Precision: 0.1mm to 1/100mm For more details, please contact us or download the catalog.

We produce resin parts for control equipment. We can accommodate parts of various sizes. We can also handle secondary processes such as welding, insert metal fittings, insert metal fittings, silk printing, and assembly. 【Specifications】 ○ Material: Engineering plastic ○ Lot: 1 to no upper limit ○ Precision: 1/100 to 1/1000 mm For more details, please contact us or download the catalog.

By incorporating bamboo powder into plastic materials (mainly polypropylene), it is expected to reduce CO2 emissions, lower resin costs, add the antibacterial effects of bamboo to the resin, and improve mechanical strength.

With pride as a small and medium-sized enterprise supporting global manufacturing, we continue to expand the possibilities of plastics and contribute to the development of society. In this context, we have developed "environmentally friendly plastic materials" to address recent environmental issues. [Contents of the document] ■ Introduction of PP resin with bamboo powder ■ Introduction of PP resin with wood powder ■ Introduction of resin with biodegradable pulp ■ Introduction of resin containing eggshells ■ Strength data and possible resin contents ■ Replacement applications, etc. *For more details, please refer to the PDF document or feel free to contact us.

Accelerate your business with revolutionary metal 3D printers. They can precisely reproduce complex designs and quickly manufacture robust products. Improve the speed from research to product development and strengthen your competitiveness. Streamline the production of custom products and prototypes, creating new revenue opportunities. Achieve cost reductions with sustainable manufacturing processes. Future-oriented technology realizes visions and drives innovation. Respond to the needs of the times and establish leadership in an evolving business environment.

Our company has a 3D printer that uses a laser melting method known as the PBF (Powder Bed Fusion) process. The advantages of metal 3D printing include the ability to create complex shapes, improved customization, and optimization of weight and strength. At Yamato Gosei, we are committed to developing technologies that maximize these benefits. We are also offering materials that explain the "advantages and disadvantages of metal 3D printers." Please check the PDF download below. *For more details, please refer to the PDF materials or feel free to contact us.

Yamato Gosei Co., Ltd. handles everything from resin selection, mold design, manufacturing, prototyping, to mass production processing, and offers the development of customized materials and proposals for product shapes. Additionally, we provide precision processing using rare thermosetting resins, as well as gas venting technology within molds and composite molding technology with metals. Furthermore, we are engaged in the development of high-strength, high-heat-resistant resin molded products that are closer to metals by incorporating long fibers into thermosetting resins. [Uniqueness and Technical Standards] - Comprehensive engineering services for product development - Thermosetting molding technology - Weight reduction of automotive components through metal composite - Quality control within the molding process - Promotion of automation and labor-saving measures *For more details, please download the PDF or feel free to contact us.

We are a plastic molding processing manufacturer. Utilizing approximately 85 years of molding experience, we provide total support from planning to design, prototyping, and mass production. We can handle various tasks, such as creating 3D data from sketches, producing with both metal and resin 3D printers, and quickly manufacturing prototype molds at low cost. In addition to our extensive facilities, we can also collaborate with partner factories. 【Features】 ■ Careful hearing ■ 85 years of know-how and track record ■ Proposals for shapes suitable for QCD considering mass production ■ Consideration for confidentiality *For more details, please refer to the materials. Feel free to contact us.

Medical device parts made of PC (polycarbonate) and PP (polypropylene) are components for drip infusion needles, components for dialysis needles, and catheter introducer components, all molded in a clean environment. [Features] ○ Processing method: Injection molding For more details, please contact us or download the catalog.

This is the frame part of a winding coil. It uses PBT (polybutylene terephthalate) resin with GF (glass fiber). Yamato Gosei Co., Ltd. performs pin insertion on this resin part. 【Features】 ○ Processing method: Injection molding For more details, please contact us or download the catalog.

We are jointly developing and using materials with improved friction coefficients and materials tailored for clutch components in collaboration with material manufacturers. We can ensure high roundness. There are also friction sliding materials that are insert molded. Due to the need for high strength, nylon (with 50% glass) is also used. 【Specifications】 ○ Material: Resin ○ Lot: 1 to no upper limit ○ Precision: 0.1mm to 1/100mm For more details, please contact us or download the catalog.

It is used for pipes that supply air to the engine and for auxiliary equipment. The core extraction structure follows the angle of the R80 and is performed using a mold mechanism. There are three insert fittings. After molding, an annealing process is carried out to improve dimensional stability. In addition, we can also produce motorcycle meter parts, muffler parts, cover parts, emblems, etc., so please feel free to consult with us. 【Specifications】 ○ Material: Resin ○ Lot: --- ○ Precision: Below 1/1000mm For more details, please contact us or download the catalog.

These are electrical and electronic components such as proximity switches (sensors) and trimmer capacitors that support the computer society. They are also compatible with metal inserts and thin-walled molding. 【Specifications】 ○ Material: Resin ○ Lot: --- ○ Precision: --- For more details, please contact us or download the catalog.

We produce various sizes of breaker components in Japan and Vietnam. We manufacture various parts such as the exterior of the breaker, internal electrical insulation components, and sliding parts like switches. Production is done through injection molding and compression molding. 【Specifications】 ○ Material: Super engineering plastic ○ Lot: 1 to no upper limit ○ Precision: 0.1mm to 1/100mm For more details, please contact us or download the catalog.

This is a control component for automatic vehicles made using super engineering plastics. The contact terminals and colors are inserted into the mold before forming. The thickness of the area where the sensor is placed is very thin at 0.4mm. Terminal alignment tests, continuity tests, helium leak tests, and dielectric strength tests are conducted. 【Specifications】 ○ Material: Super engineering plastics ○ Lot: --- ○ Accuracy: --- For more details, please contact us or download the catalog.

Blow molding is the most representative method for forming hollow molded products. Plastic raw materials are melted in a blow molding machine, clamped in a mold, and air is blown inside to create hollow products (blow-molded products). Daiwa Gosei Co., Ltd. manufactures eye drop containers in the clean room of its factory in Vietnam. For more details, please contact us or download the catalog.

This is a power steering reservoir tank made from engineering plastic. A major feature is that two molded parts are fused together using vibration welding to form a single unit. To ensure functionality, air leak tests and pressure tests are also conducted. The extraction by robots and the insertion of the collar (outsert) are performed automatically. 【Specifications】 ○ Material: Engineering plastic ○ Lot: --- ○ Precision: --- For more details, please contact us or download the catalog.

This is a sleeve for vibration motors for mobile phones. It can accommodate small precision parts with a size of 1.1 mm. It is compatible with a molding system that uses suction for extraction and sensors for verification. 【Specifications】 ○ Material: Engineering plastic ○ Lot: --- ○ Accuracy: --- For more details, please contact us or download the catalog.

This is a angular velocity sensor (gyro sensor) molded using engineering plastic with a vertical injection molding machine. It incorporates 10 contact terminals and 2 colors as inserts within the mold. A vertical injection molding machine, advantageous for inserts, is used. Terminal alignment tests and continuity tests are conducted. We also have extensive experience in insert molding, so please feel free to consult us when looking for insert molding solutions. 【Specifications】 ○ Material: Engineering plastic ○ Lot: --- ○ Accuracy: --- For more details, please contact us or download the catalog.

This is a part used for the cap of a car's reservoir tank and is classified as an important safety component. We also perform assembly and pad printing. After assembly to the tank, an air leak test is conducted. 【Specifications】 ○ Material: Engineering plastic ○ Lot: --- ○ Precision: --- For more details, please contact us or download the catalog.

Due to the complex shape, the upper and lower parts of the product are molded separately and bonded using vibration welding. Metal brackets can also be assembled in-house. Contamination management and pressure resistance management are also conducted. Currently, we only supply automotive applications, but we have various molding achievements with different resins, so please contact us if you are looking for a reservoir tank. 【Specifications】 ○ Material: General-purpose plastic ○ Lot: 1,000 to 100,000 pieces ○ Accuracy: Approximately ±0.5mm For more details, please contact us or download the catalog.

We have established a stable mass production technology for bamboo fiber reinforced plastic, "bamboo fiber reinforced green composite material." For a limited time, we are giving away stamp trays made from bamboo-containing plastic to the first 10 customers.

We produce various precision parts that support optical devices such as single-lens reflex cameras and highly versatile household electrical appliances and equipment. Please feel free to contact us.

Biomass plastic is a type of plastic obtained by chemically or biologically synthesizing renewable biomass resources. Even when incinerated, it has the characteristic of not increasing the concentration of CO2 in the atmosphere due to the carbon neutrality of biomass. This is expected to contribute to reducing dependence on fossil resources and solving the 3R issues of plastic. 【Features】 - By incorporating bamboo powder, wood powder, coffee grounds, etc., into PP resin, it can be disposed of as general waste. - Consideration for the environment, such as preventing global warming, is achieved by reducing the amount of resin, which in turn reduces CO2 emissions. We also accept consultations for molded parts tailored to our customers' needs and applications, so please download the materials for more details or contact us directly.

Our company manufactures plastic molding molds in-house. Data designed by engineers in Japan is processed at our factory in Vietnam. By utilizing the Vietnam factory, we keep the mold production costs low and provide them to our customers. We produce thermoplastic and thermosetting molds.

- Suitable for molded products that are thick and wide (plate-shaped items). - Superior filling performance compared to side gates, but more difficult to handle gate processing as a result.

It is equipped with a flash control function, allowing for low-pressure filling and preventing burrs. Furthermore, we will make capital investments to enable manufacturing that impresses our customers.

Transfer molding is a method that differs from direct pressure molding, where materials are directly introduced during the opening and closing of the mold. Instead, in transfer molding, softened materials are introduced through an inlet called a pot while the mold is closed, and are filled and cured using a pushing device (plunger). This method is used when the shape of the product or the type of insert makes it difficult to mold using compression molding, or when precision and strict dimensional accuracy are required. The curing time can also be shortened compared to compression molding.

It is a 100-ton thermosetting injection molding machine made by Sumitomo Heavy Industries. Our company uses it for evaluating thermosetting molds. Once the mold is approved, mass production will be carried out by our affiliated company.

We are using PP because hinge characteristics are required. Due to poor release properties, we apply a release treatment to the mold (approximately 20 cm in total length). Due to the complex shape, variations in filling are likely to occur, and for such complex products, we reflect the results of flow analysis in mold production. *We determine the gate position using flow analysis. Production is carried out at our Miyazaki factory.

One of the gate methods in resin injection molding 【Features】 - The gate is automatically cut off during mold opening, eliminating the need for gate processing. - Depending on the gate diameter, gate marks are less noticeable. - The mold structure is a two-plate design, which helps keep mold processing costs relatively low. - The gate position can be installed on either the fixed side or the moving side.

In the case of thermosetting resin parts, burrs are inevitably generated after molding, so burr removal is necessary. It is also possible to remove only the burrs by projecting special beads onto the resin parts with attached burrs using a fully automatic burr processing machine called a deflasher (blast). There are different types of deflashers, such as apron type, drum type, and conveyor type, and the method of burr processing varies depending on the product.

Q: How can the use of wood powder plastic contribute to the SDGs? A: Regular resin products are treated as industrial waste. The biomass plastic (the material in question) in products that contain more than 10% is allowed to display a logo mark by the Japan Organic Resources Association (JORA). Additionally, products with over 50% content can be disposed of as regular waste. In our prototypes, we have successfully increased the content ratio to 70% for molding. Q: What is the source of the wood powder used? A: We use powdered thinned wood.

Q. How do you achieve products made in Vietnam with Japanese quality? A. We have a training system for Vietnamese staff at our headquarters in Osaka, where they refine their injection molding skills in Japan, contributing to the improvement of technical capabilities at our factory in Ho Chi Minh City, Vietnam. In the video, we introduce how our engineers from headquarters are stationed at the Vietnamese factory to provide guidance on molding techniques to local staff. We clearly summarize our collaboration system with overseas bases and our efforts in technology transfer, interspersed with interview footage and scenes of on-site instruction.

It is a cover for a signal converter and is a component that fits with the counterpart part. It adopts a side gate method, but generally, the side gate method requires gate processing. In this product, gate processing is unnecessary due to a mechanism that cuts the gate while the product is inside the mold. 〇Material: PC (Polycarbonate)

It is classified as a super engineering plastic, has heat resistance, and contains 30% glass fiber, making it excellent in impact resistance as well.

We insert friction materials and apply a latex coating to stabilize the initial friction coefficient after molding. To prevent resin covering in the insert area, we have implemented special measures in the mold.

This product has strict dimensional tolerances (range 0.06mm) due to its important safety components and fitting with other parts in automobiles. It is produced at our Miyazaki factory. We use MXD6 nylon (Lenny) and perform annealing treatment to promote crystallization.

POM (polyacetal) is often used for sliding parts such as gears due to its excellent sliding properties and wear resistance. In this product, to improve roundness, even though it is a small part, it has a three-point pin gate structure.

POM (polyacetal) has excellent mechanical strength, wear resistance, sliding properties, solvent resistance, and electrical properties (insulation).

It is a protective component of the breaker called a terminal cover. We have achieved complete automation that automatically cuts the side gate's gate.

The dimensional tolerances are strict, but adjustments are made by polishing the outer surface after molding. Since it collides with the counterpart and has a significant impact on quality, we measure the contact surfaces every time. We are producing this at our Miyazaki factory.

We are inserting friction materials (friction washers). After molding, there are also product numbers that undergo latex coating or matching to stabilize the initial friction coefficient.

In the stationery industry, efforts to reduce environmental impact are being emphasized. In particular, the sustainability of materials is required for writing instruments. Traditional plastic materials can pose challenges regarding their impact on the environment. Our bamboo powder blended resin molded products contribute to reducing CO2 emissions, lowering resin costs, adding antibacterial properties from bamboo to the resin, and improving mechanical strength. 【Usage Scenarios】 - Bodies of writing instruments such as ballpoint pens, mechanical pencils, and markers - Eraser cases - Rulers 【Effects of Implementation】 - Contributes to enhancing the company's image as an environmentally friendly product - Improved profit margins due to cost reductions - Increased added value of products due to antibacterial effects

Yamato Gosei Co., Ltd. manufactures integrated molded products made of different resins and colors through two-color molding on a contract basis. By molding two types of resins in the same process, there is no need for adhesion, assembly, or secondary processing. This reduces the number of parts and achieves high-quality exterior components without assembly misalignment or steps. We have a proven track record in mass production for medical device housings (top cases for blood glucose meters / AS resin × ABS resin) with strict quality requirements, and we possess the know-how to finish two materials with different designs and textures into one component with high precision at the boundary. Molding is carried out at our factory in Vietnam (Ho Chi Minh City) using the Sumitomo Heavy Industries SE230HS-CI (clamping force 230t), operating 24 hours a day in three shifts. We handle everything from gate cutting to tray packing in-house, allowing us to ship in a ready-to-deliver state, thereby achieving stable supply for mass production and total cost reduction simultaneously. Customers who wish to "eliminate the assembly process" or "reduce costs with integrated parts of different materials" are invited to send us drawings or sample parts. We will promptly respond with feasibility and estimated costs.