大成プラス List of Products and Services

Thick-walled molding is one of the methods of resin injection molding and is a technology used for applications such as lenses that take advantage of the product's wall thickness. However, in conventional thick-walled molding, there were issues such as sink marks and voids (bubbles) that needed to be addressed by slowing down the injection speed and extending the cooling time, which resulted in longer molding cycles. As a result, thick-walled molded products tend to be more expensive. Therefore, we propose a thick-walled molding method using two-color molding. *For more details on the column, please refer to the related links. For further inquiries, feel free to contact us.

• Other services and technologies

This time, we would like to propose "laser marking," which is one of the decorative processes for molded products. Compared to ink printing, laser marking, which offers high durability, is widely adopted in medical devices that undergo frequent alcohol disinfection. However, laser marking not only enhances the durability of prints but also provides various benefits in improving the design quality of products. Keytops that form letters and symbols using two different colored resins can be expressed through two-color molding, but if we want to add a transparent layer to the surface, three-color molding is required. *For more detailed information, please refer to the related links. Feel free to contact us for further inquiries.

• Other services and technologies

Recently, the demand for flame-retardant plastics has been expanding. Their applications span various fields, including automobiles, industrial equipment, and amusement devices. It is generally known that there are flame-retardant grades for rigid plastics, but the existence of flame-retardant grades for elastomers, which are soft plastics, is not widely recognized. Therefore, in this article, we will introduce flame-retardant grades. *For more detailed information, please refer to the related links. Feel free to contact us for further inquiries.*

• Other services and technologies

Two-color molded products made of PC (polycarbonate) and ABS can be plated on the ABS side without masking. This technology utilizes the characteristic of PC, which is difficult to plate, allowing plating only on the ABS side. By taking advantage of the features of two-color molded products and applying plating, we can further enhance decorative and functional properties, making it suitable for automotive parts and decorative components of amusement equipment. *For detailed information, please refer to the related links. For more information, feel free to contact us.

• Other services and technologies

Daisei Plus Co., Ltd. can perform two-color molding in a clean room environment. In a clean room that is pressurized by a HEPA filter air supply unit, it is possible to carry out molding, assembly, inspection, and packaging operations, providing a suitable environment for products such as optical components, medical supplies, food, and cosmetics. Workers remove hair, dust, and other contaminants from their clothing using adhesive rollers and air showers to prevent foreign matter contamination. *For more details, please refer to the related links. Feel free to contact us for more information.

• Other services and technologies

In recent years, as the demand for two-color molding has increased, we have been receiving more inquiries about three-color molding as a way to add further value. Similar to two-color molding, there may be challenges depending on the combination of resins, but our company also owns a dumbbell test mold for fusion verification. Therefore, we can start by testing the material combinations through prototype development. If you would like to see samples of three-color molding or inquire about the technical details, please feel free to contact us. *You can view the detailed content of the column through the related links. For more information, please do not hesitate to contact us.*

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This time, we would like to propose products made from wood-like resin materials. Cellplane is a material composed of 100% resin, without the use of wood powder or similar substances. It does not absorb moisture, which can cause corrosion in wood and WPC (wood-plastic composites), so there will be no corrosion over time. It is also possible to achieve lightweight designs due to the potential for foaming depending on the molding conditions. Various designs for appearance are also possible. *For detailed information about the column, please refer to the related links. For more information, feel free to contact us.

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Integrating multiple materials through injection molding. This is a development concept that we have valued since the establishment of our company. We have been engaged in manufacturing with various combinations such as "resin + resin" or "resin + metal," but there are cases where integration is not possible depending on the combination of materials. Therefore, our company actively collaborates with various material manufacturers, and when existing materials do not meet the specifications required by our customers, we also work on creating custom materials tailored to those needs. *For detailed content of the column, please refer to the related links. For more information, feel free to contact us.

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Two-color molding is an integrated molding technology that uses an injection molding machine equipped with two injection cylinders and two molds to thermally fuse two types of resin in a single molding cycle. This not only reduces assembly labor but also enhances the functionality of injection-molded parts. Our company specializes in two-color molding that combines "hard resin + soft elastomer," as well as molding with different color combinations, enabling the creation of molded products that cannot be expressed with just one type of material, as well as value-added products. *For detailed content of the column, please refer to the related link. For more information, feel free to contact us.

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A machine that melts plastic material with heat, pours it into a mold, and shapes it is called an "injection molding machine." It is also referred to as a plastic injection molding machine, and it is a type of machine tool that can handle the processes of "melting the material (fusion) → injecting it into the mold (injection and molding) → solidifying it (cooling) → removing it" all in one unit. *For more detailed information, you can view it through the related links. Please feel free to contact us for more details.

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The two-color molding technology not only offers cost advantages by eliminating the need for assembly and adhesive processes, but it also enhances user experience and improves the design of electronic products. Taking the buttons of an elevator as an example, when the numbers are printed, there is a problem where the characters wear down and become faded over time. By using a light-transmitting material for the number part and performing two-color molding, it is possible to create buttons that are resistant to wear. *For more details on the column, please refer to the related link. For further inquiries, feel free to contact us.

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Two-color molding is a method of creating a single molded product by combining two different materials (resins or materials). For example, it is possible to mold a combination of plastic and elastomer (soft material). Since it combines two different materials in one process or cycle, it is also referred to as "double mold." The molding machine for two-color molding has two nozzles and a cylinder. Materials are injected and filled into the mold in sequence, allowing for the creation of two types of components. Additionally, it generally uses two molds with different concave sides. *For more detailed information, please refer to the related links. For further inquiries, feel free to contact us.*

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Plastics are widely used in electrical appliances and medical components, so the point of "flammability" (i.e., flame retardancy) is an important indicator for ensuring safety. In evaluating the flammability of plastics, we look not only at "non-combustibility," which means it does not catch fire at all, but also at characteristics such as "self-extinguishing," where the fire goes out when removed from the heat source, and "slow-burning," where the combustion rate is slow even if it catches fire. Even silicone rubber, which is generally considered to be flame-retardant, is a material that lacks self-extinguishing properties and will continue to burn once ignited. Therefore, to achieve a practical level of flame retardancy, flame retardants are added to slow down the combustion rate or impart self-extinguishing characteristics. *For more details on the column, please refer to the related links. Feel free to contact us for more information.*

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Injection molding is an excellent manufacturing method that allows for the rapid mass production of products with complex shapes. The process can be broadly divided into three steps: melting, injecting, and solidifying. To perform injection molding, an injection molding machine and a mold are required. The roles involved are melting the molding material, injecting the melted molding material, and opening and closing the mold to solidify the injected material. Therefore, the injection molding machine consists of an injection unit that melts and injects the molding material, and a clamping unit that attaches the mold and opens and closes it. Additionally, it is equipped with mechanisms to drive these two units. *For more detailed information, please refer to the related links. For further inquiries, feel free to contact us.*

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In the production of plastic products, there are two types of molds needed: "mass production molds" (main molds) suitable for mass-produced items, and "simplified molds" (temporary molds / prototype molds) suitable for small lots with short delivery times. For mass production, "mass production molds" made of wear-resistant steel are suitable as they can consistently produce high-precision products. On the other hand, for prototypes or small lot production, "simplified molds" made of aluminum are suitable as they help reduce mold costs. *For detailed information, please refer to the related links. For further inquiries, feel free to contact us.*

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In two-color molding, products are made by combining two types of materials. Depending on the combination of materials, it is possible to add functions and designs that cannot be achieved with conventional injection molding, such as those with different hardnesses and colors or completely different materials. Additionally, by eliminating the need for manual assembly, time and costs can be saved, and by not using adhesives, consideration for the environment is possible. *For more details on the column, you can view it through the related links. Please feel free to contact us for more information.*

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Approximately 8 million tons of plastic flow into the ocean as waste each year, and various measures related to plastic, such as seawater-degradable plastics and recycling, are attracting attention. Additionally, the commitment to the SDGs has become essential for companies globally as part of their corporate philosophy. In addressing environmental issues, there are various perspectives and methods, whether the goal is to reduce the amount of plastic used or to emphasize recycling. *For more details on the column, please refer to the related links. For further inquiries, feel free to contact us.*

• Other resource recycling

Among the "injection molding machines" that melt plastic with heat and pour it into molds for shaping, those that can combine and mold two or more materials simultaneously (two-color molding / multi-color molding) are referred to as "multi-color molding machines." In this article, we will introduce five manufacturers of injection molding machines and their representative multi-color molding machines. Please take a moment to read it. *For detailed content of the column, you can view it through the related links. For more information, please feel free to contact us.

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We would like to introduce "Plating Masking," the core technology of Daisei Plus Co., Ltd. By applying plating to products (base materials) that are molded in two colors using a combination of ABS resin, which allows plating to deposit, and PC resin, which does not, it is possible to achieve beautiful plating on the intended design areas. Since the plating edge is formed within the mold, there is no need for the conventional complex masking processes, allowing for the creation of beautifully finished plated decorative items. 【Product Example】 ■ Item: Lens cover for vehicles ■ Resin: PC + ABS ■ Product Size: 45mm (height) × 280mm (width) × 80mm (depth) ■ Molding Machine: Two-color molding machine (SE280T) ■ Sales Point: Expression of metallic aesthetics through two-color plating masking *For more details, please refer to the PDF document or feel free to contact us.

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We would like to introduce "thick lenses," which is the core technology of Daisei Plus Co., Ltd. Our company proposes thick light guide lenses that reduce pressure-holding cooling time and halve the molding cycle using our unique know-how with two-color molding. As a result, improved production efficiency also makes it possible to reduce costs. Please feel free to contact us when you need our services. 【Product Examples】 ■ Item: Spherical light guide lens (4 pieces) ■ Resin: PMMA + PMMA (or PC) ■ Product Size: Diameter Φ60mm, Thickness 20mm ■ Molding Machine: Two-color molding machine (SE280T) ■ Selling Point: Increased production efficiency and reduced costs due to halving the molding cycle *For more details, please refer to the PDF document or feel free to contact us.

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We would like to introduce our core technology, the "Fused Dumbbell," from Daisei Plus Co., Ltd. In response to the voices saying, "I want to consider the design concept for two-color molding, but I want to know the fusion strength of the materials I want to use," we have prepared a dumbbell test mold for two-color molding (for fusion confirmation) and report the fusion strength results of the materials. This allows for the pre-validation of material fusion strength, enabling progress to the next design step. 【Features】 ■ We provide a dumbbell test mold for two-color molding (for fusion confirmation) and report the fusion strength results of the materials. ■ Pre-validation of material fusion strength allows for progression to the next design step. ■ Experienced staff provide advice during the material selection phase. *For more details, please refer to the PDF document or feel free to contact us.

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We would like to introduce "3-color molding," which is the core technology of Daisei Plus Co., Ltd. By incorporating the idea of inserting into the primary side of a two-color molded product, we are realizing a three-color molded product that was previously hard to imagine. This allows for designs using various combinations of materials, expanding the possibilities for product development. 【Product Examples】 ■ Materials: ABS + TPEE + PMMA ■ Molding Machine: Two-color molding machine (SE130T) ■ Product Size: 20mm (height) x 33mm (width) x 9mm (depth) ■ Selling Points: Waterproofing and cost reduction through three-color integration *For more details, please refer to the PDF document or feel free to contact us.

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We would like to introduce our core technology at Daisei Plus Co., Ltd., which is "Large Two-Color Molding." Based on our solid track record in two-color molding over many years, we are capable of precise two-color molding for large products. Leveraging our experienced technical expertise, we respond to market needs for "large-scale two-color molding." 【Product Examples (Partial)】 ■ Product Name: LED Light ■ Resin: PC + PC ■ Product Size: 300mm (Length) × 60mm (Width) × 46mm (Height) *For more details, please refer to the PDF document or feel free to contact us.

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We would like to introduce "Multifunctional Integration," the core technology of Daisei Plus Co., Ltd. We have achieved the integration of necessary functions for products (such as waterproof buttons, LED lenses, light-shielding ribs, LCD screens, waterproof gaskets, etc.). By molding multiple functions into a single unit, we can reduce assembly labor and lower costs. 【Product Achievement Examples】 ■ Item: Waterproof Remote Control Case ■ Product Size: 95mm (height) × 190mm (width) × 17mm (depth) ■ Material: PMMA + TPEE ■ Molding Machine: Two-color molding machine (SE280T) ■ Selling Point: Waterproof and cost reduction through two-color molding multifunctional integration *For more details, please refer to the PDF document or feel free to contact us.

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We would like to introduce a technology called "two-color molding," which involves injecting two types of materials to create a single product. The injection molding machine has two nozzles and cylinders, and the injection is done sequentially into the primary and secondary molds. A significant feature of this process is that, to combine the two materials, after injecting into the primary mold, additional steps such as a 180-degree rotation, inversion, or sliding are added before injecting into the secondary mold. Since multifunctional items can be produced in a single process, it is possible to significantly reduce the assembly steps that were previously done manually, thereby increasing productivity. 【Compatible Materials】 ■ Various plastics ■ Thermoplastic elastomers ■ Thermosetting elastomers ■ Polypropylene ■ Polyacetal ■ Polyvinyl chloride *For more details, please refer to the PDF document or feel free to contact us.

• Processing Technology

We would like to introduce our company's injection molding bonding technology for metals and resins, called "NMT Treatment." By performing "NMT Treatment," we uniformly form very stable dimples of 20 to 50 nm on the metal surface. By embedding resin into these fine dimples through injection molding and allowing it to crystallize, a strong bond can be achieved. The strong bonding of various resins and metals allows for greater freedom in product design. 【Features】 ■ Bonding strength (shear strength) = over 40 MPa ■ The strong bonding of various resins and metals allows for greater freedom in product design ■ After thermal shock testing (-55℃/1H ⇔ 150℃/1H × 3000 cycles), there is no degradation in bonding strength (equivalent to a 10-year specification for automotive engine rooms) ■ Aluminum can be used in high-temperature and high-humidity environments (after testing at 85℃/85% RH × 8000 hours, there is no degradation in bonding strength) ■ Nano-order dimples are formed in a short time *For more details, please refer to the PDF materials or feel free to contact us.

• Processing Technology
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This document contains the technical data for products handled by Taisei Plus. It includes tests such as shear strength tests, tensile strength tests, and high temperature and high humidity tests. The evaluation methods for shear strength tests, tensile strength tests, and adhesion strength tests are in accordance with ISO 19095. Please take a moment to read it. [Contents] ■ Shear Strength Test ■ Tensile Strength Test ■ Adhesion Strength Test ■ High Temperature and High Humidity Test ■ Product Performance *For more details, please refer to the PDF document or feel free to contact us.

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"NMT (Nano Molding Technology)" is a technology for integrated molding of metal and resin through injection molding. By applying surface treatment to the metal, nano-level dimples are formed on the metal surface. These fine dimples are filled with hard resin through injection molding, integrating the metal and resin. Additionally, since processes such as surface treatment are not required, like in magnesium alloy molding technology, it contributes to cost reduction and shorter processes. During recycling, the risk of ignition is low, allowing for safer operations, which also helps reduce environmental impact. 【Compatible Resins and Metals】 ■ Resins - PPS, PBT, PA6, PA66, PPA ■ Metals - Aluminum, Magnesium, Copper/Brass - Stainless Steel/Titanium/Iron/Aluminum-coated Steel *For more details, please refer to the PDF document or feel free to contact us.

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At Taisei Plus Co., Ltd., we offer a strong adhesion technology called 'NAT (Nano Adhesion Technology)' utilizing epoxy adhesives. The NAT treatment creates fine irregularities on metal surfaces, allowing the epoxy adhesive to penetrate into the recesses when applied, resulting in a strong adhesive bond. Additionally, the high adhesion strength enables high-strength bonding of dissimilar metals. This makes it possible to produce products that could not be achieved with traditional methods such as welding. 【Features】 ■ Nano-sized surface treatment ■ Adhesion between metals using epoxy adhesives ■ Achieves adhesion strength more than 2 to 3 times that of conventional methods ■ Applicable to aluminum, magnesium, copper, stainless steel, iron, and titanium *For more details, please request materials or view the PDF data available for download.

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At Daisei Plus Co., Ltd., we offer a technology for integrated molding using injection molding of metals and resins called 'NMT (Nano Molding Technology).' By applying surface treatment to metals, we create nano-level dimples on the metal surface. This groundbreaking technology generates a strong bonding force by incorporating hard resins. It enables the development of new products that achieve weight reduction of metal exterior components such as housings and bodies. 【Features】 ■ Bonding strength (shear strength) = 40 MPa or more ■ The strong bonding of various resins and metals allows for greater freedom in product design ■ No degradation of bonding strength after thermal shock testing ■ Aluminum can be used in high-temperature and high-humidity environments ■ Nano-order dimples can be formed in a short time *For more details, please refer to the PDF document or feel free to contact us.

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