Two Color Injection Molding Machine: What You Need To Know

Are you looking for a two-color injection molding machine? Two-color injection molding machine is a very common injection molding machine, producing products for a wide range of applications. So what is two-color injection molding? How does it work? And how to choose a two-color injection molding machine? Today, I will show you how to choose a two-color injection molding machine.

What is two-color injection molding

The so-called two-color injection molding machine refers to the molding method of injecting two different colors of plastic into the same mold. The plastic parts can be made into two different colors, and the plastic parts can be made into regular pattern or irregular cloud pattern colors to improve the practicality and beauty of the plastic parts.

What is two-color injection molding machine

As the name implies, it is an injection molding machine that can process two colors of plastic materials at the same time. It usually has 2 injection units that process one material at a time. The two materials can be injected at the same time or at different times depending on the product requirements.

A two-color injection machine looks similar to a regular injection molding machine with the second injection unit mounted in a different location.

Toothbrushes are a very good example of production using a two-color injection molding machine

Principle of two-color injection molding machine

A two-color injection molding machine has two barrels, each of which is constructed and used in the same way as regular injection molding. Each barrel has its own channel connected to the nozzle, and the opening and closing valves in the nozzle channel are 2 and 4. When molding, the melt is plasticized in the barrel, and the opening and closing valves 2 and 4 control the sequence of melt entering the nozzle and the ratio of discharge, and then the nozzle is injected into the mold cavity. Various plastic products with different mixing effects can be obtained.

Material requirements of two-color injection molding machine

Two color injection molding supporting materials must meet two basic compatibility conditions, i.e., adhesive compatibility and processing compatibility.

Technical requirements of two-color injection molding machine

• Soft and hard plastic double fire design

  When using a two-color injection molding machine for injection, there must be a certain temperature difference between the two materials. Generally, it is recommended to be at 60 degrees Celsius, and at least 30 degrees Celsius is recommended. The first material has a high melting point, the first is PC or PC/ABS, and the second is It is TPU or TPE, the thickness of PC is 0.6-0.7mm, and the software is above 0.4mm.

  Try to widen the contact area, make grooves, etc. to increase adhesion, or use the core for the first injection, and the material of the second injection part is injected for the first time, and the first side of the mold is as rough as possible.

• Transparent and non-transparent double-fire design

  Small lens double beam design: When using a two-color injection molding machine, the first shot is opaque, the second shot is used for the lens, the first shot uses PC with high melting point as much as possible, and the second shot uses PMMA.

  Decorative transparent and opaque dual-fire design, opaque material first, transparent material second, opaque material is usually used as high temperature resistant PC, and secondly transparent material is PMMA or PC. The pc needs to be sprayed with UV protection. PMMA can choose UV or enhanced. If there are characters on the surface, UV must be selected.

Mould requirements for two-color injection molding machine

Two plastic materials are molded twice on the same injection molding machine, but the product is molded only once. Generally this molding process is also called two-color injection molding, which is usually a set of molds and requires a special two-color injection molding machine.

There are generally the following requirements.

1. The two shapes of the female mold must be different to form a product separately, and the two shapes of the male mold must be exactly the same.
2. After the mold center of the two-color injection molding machine is rotated 180 degrees, the mold must be the same.
3. The total thickness of the front panel plus the A plate of the two-color injection molding machine should not be less than 170mm. The maximum thickness of the mold, the minimum thickness of the mold and the distance of the KO hole should be carefully studied.
4. The three-plate ejection port of the two-color injection molding machine can be designed for automatic demolding.
5. When designing the master mold for the second injection, in order to avoid the second master mold from scratching the glue surface of the first molded product, a part can be designed to avoid the cavity. However, it is necessary to carefully consider the strength of each sealing part (that is, whether there is plastic deformation under a large injection pressure during injection, leading to the possibility of a batch front in the second injection). ;
6. When using a two-color injection molding machine for injection molding, the product size of the first injection can be slightly larger, so that it can be more closely matched with each other during the second molding to meet the sealing effect.
7. Note that in the second injection, the plastic flow will impact the first molded product and deform the glue.
8. Before clamping the A or B plate of the two-color injection molding machine, pay attention to whether the front mold slider or the inclined top will reset and crush the product first.
9. The water distribution of the two male and female molds is as balanced as possible.
10. In 99% of the cases, the hard plastic part of the product is injected first, and then the soft plastic part of the product is injected, because the soft plastic is easily deformed.

Where can I buy two-color injection molding machine

If you are looking for a two-color injection molding machine to meet your manufacturing needs, then you can search for them on the Internet. However, you should keep in mind that there are specialties for this type of machine. However, there are many manufacturers of this machine that mass produce their products. Therefore it is important to choose a good manufacturer of dichroic injection molding machine.

Choosing a Chinese two color injection molding machine manufacturer

The competition for injection molding machines is fierce. Here, we recommend you to buy dichroic injection molding machine from a Chinese injection molding machine manufacturer. There are many advantages of the products produced by Chinese injection molding machine manufacturers. We have listed five advantages below.

1. Abundant and top-notch workforce
2. Young and growing population
3. Consistent cost reduction
4. Infrastructure and geography
5. Stable supply

How to find a two color injection molding machine manufacturer

In general to find a Chinese injection molding machine manufacturer we can take the following approaches.

• Alibaba

  China's largest foreign trade export website, where you can choose from a wide range of two color injection molding machine suppliers and manufacturers in different regions.

• Made in China

  Made in China specializes in promoting Chinese products and accepts only Chinese suppliers to post information about their products. It is currently the only large B2B platform with the sole mission of promoting Chinese products.

• Global resource

  Focuses on foreign trade of domestic small and medium-sized enterprises and provides professional services for foreign buyers.

• Google Search

  Generally speaking, good two color injection molding machine manufacturers also have their own independent websites. You can find these websites by googling two-color injection molding machine manufacturers. They will be more professional and quicker to reply than the platform.

How to choose a two-color injection molding machine

Before purchasing a two-color injection molding machine, you must fully understand the parameters and characteristics of this injection molding machine to meet the requirements of later production and create greater benefits.

Pay attention to the following parameters when buying an injection molding machine, which is suitable for most injection molding machines, and two-color injection molding machines are no exception.

• Injection size

  The injection size is best defined as the maximum amount of plastic that the injection molding machine can inject into the molding cavity in a molding cycle. The injection size of a two-component injection molding machine is very important. You need to choose the best injection molding machine with the correct injection cavity. Therefore, when you are looking for such a machine, the recommended best practice is to use a plastic molding machine that can produce 30% to 40% larger injection sizes.

• Tonnage

  Tonnage refers to the pressure related to clamping, which is called clamping tonnage. In the context of injection molding equipment, tonnage is measured by how many tons of downforce the machine can hold the platen together. These pressure plates are used to hold the mold cavity in place and allow plastic to be injected into the cavity to produce parts.

• Press plate size

  The platen in the two-color injection molding machine is a tool or workbench that helps to effectively hold the mold cavity in place. The entire structure is separated when inserted into the mold. They are firmly clamped by the pressure plate. The two pressure plates are connected together and subjected to high pressure. Once the two pressure plates are combined and subjected to a lot of pressure, the plastic is heated, injected under pressure, and then you need to cool the plastic mold and use them to make further modifications. Therefore, the size of the platform adds enough pressure to make the parts have the correct shape.

• Tie rod space

  The tie rod spacing is defined as the space between the horizontal tie rods on the injection molding machine. The plastic product manufacturing machine is composed of tie rods placed horizontally. Pitch is an important consideration. Basically, the measured value and the maximum spacing of the press plates determine the maximum size of the mold that can be placed in the molding machine, and the spacing of the press plates can start the molding cycle according to the size of the mold. For this, you can seek expert help, and the manufacturer can help you assemble this type of molding machine.

• Ejection stroke

  The ejection stroke in the two-color injection molding machine is to eject the machine by pushing or with the help of a thimble to form the final part from the platen. If there is no ejection stroke, the machine will stop working, so it is important to check the ejection stroke before purchasing the machine.

List of two-color injection molding machine manufacturers in China

How to choose a manufacturer of two-color injection molding machine

Pay attention to the following matters when choosing a two-color injection molding machine manufacturer.

• Services of two-color injection molding machine manufacturers

  Before buying a reliable two-color injection molding machine, we must first confirm the qualifications of this two-color injection molding machine manufacturer. Whether it is a well-known domestic enterprise, its qualifications, and its user reputation.

• Vendor operating status

  What enables the company to provide users with high-performance, high-quality two-color injection molding machines? This is to confirm whether the company's resources have strong technical support, and it can generally operate stably for more than ten years.

• Production scale

  The scale and processing capacity of high-quality two-color injection molding machine manufacturers, such as the company’s production workshop of more than 10,000 square meters, can process and produce national standard injection molding machine samples, and the production process is rigorous, which proves the company’s high market recognition and high maturity production technology. Product quality is stable.

• Two-color injection molding and product performance

  Stable performance, continuous cooperation with many customers, product performance is definitely trustworthy!

• Compare Prices

  The product price is transparent and the cost is clear. It is necessary to make a horizontal comparison between a number of intended two-color injection molding machine manufacturers. The same configuration and the same performance basically play a decisive role in the price.

• After-sales service for injection molding machine manufacturers

  Whether the after-sales service can achieve timely customer service + technical service, in place in time, users can rest assured.

Then carefully check the required injection molding machine product situation

• Two-color injection molding machine product situation

  The general production process and manufacturing process have reached the national special equipment manufacturing standard, which is unattainable by ordinary small workshop factories.

• Materials used in the product

  Check whether the manufacturer's raw materials, accessories, fuselage, and paint meet industry standards. For example, Shanghai Baosteel, Wuhan Iron and Steel, Anshan Iron and Steel and other domestic first-line steel plants are used, high-quality golden bridge welding wire is used, and brand-name manufacturers high-strength accessories are used.

• Manufacturing process

  If you want to know the quality, you must first understand the processing process of the two-color injection molding machine, and inspect from each processing link. Whether each link is complete, whether the welding is full, whether the material welding is smooth, and there is no missing welding.

• Product Certificate

  See whether there is a national standard certificate, and whether the information such as the manufacturer number of each product is complete and clear. This is a measure of a manufacturer's confidence in its products, and it is also a prerequisite for customers to get formal and reasonable after-sales service after purchase.

Choose the top two-color injection molding machine in China

Kebida is the leading two-color injection molding machine manufacturer in China, and has been focusing on producing high level two-color injection molding machines for many years. the two-color injection molding machines developed and manufactured by Kebida have the features and advantages of beautiful appearance, high stability, high precision, low noise, energy saving and low consumption. They have been widely praised by customers all over the world.

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