2K Injection Molding Producer Specialist in China

Professional 2K Injection Mold Manufacturer

2K injection molding process in which parts are formed out of two materials. Some of the two materials are different colors, some are different soft and hard, so as to improve the product's aesthetics and assembly performance. Kemal specialized in 2K injection moulding with professional team, we always provide the proper suggestion that is based on customers request, but exceed the expectation.

2K Injection Molding Parts

2K injection molding is becoming increasingly popular in the market, which allows for a more beautiful appearance and easy color changes without painting, Kemal can manufacture a wide variety of 2K injection molded parts. our technology will definitely provide you with the best solution to ensure the quality and performance of your final 2K injection molded part.

Why Choose Kemal Make 2K Injection Molding

2K Injection molding products are highly structured and durable, which improves the accuracy and aesthetic appearance of your products, thus increasing the added value of your products and better meeting the diverse needs of consumers.

Kemal will be a strong partner of your 2K injection molding and provide you with advice on the best material and production method. We guarantee that the final product will be fully compatible with your requirements.

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Kemal Your Dependable 2K Injection Molding Manufacturer

Kemal can inject plastic into the mild with one or more separate injections for you. This provides very precise split lines between different materials, such as differences in hardness or color of materials.

These parts can be ruggedly assembled to make the final parts more stable

To make and test 2K injection mold, Kemal has not only precise mold making equipment, but also 2K injection molding equipment. Kemal has 200-1300 ton injection molding machines to provide professional services for your 2K injection molding.

Contact Kemal for your next 2K injection molding project and get an instant quote within 24 hours.

you are always welcome.

More Questions You May Ask

What is 2K injection molding?

2K injection molding machine is mainly used in double injection molding. Two material pipes are combined with two sets of molds to form double shot products in sequence. Working steps: 1. The raw material is injected into one-shot molding to form single shot product A. 2. After periodic opening, product A is left on the core side, then rotated to B product and closing the mold. 3. Raw material of B product is injected for twice molding to form a two-color product and open the mold to eject.

Mobile shell1-2K Injection molding

What’s need to be reviewed before design 2K injection molds?
  1. Mold material
  2. Product material
  3. The basic structure of the mold
  4. Selection of molding machine
What's the advantages and disadvantages of 2K injection molding?
  1. High precision and stable quality of products
  2. Good structural strength, good durability.
  3. Small fit-gap, good appearance.
  4. Greatly reduces the cost.
What’s the disadvantages of 2K injection molding?

The 2K injection molding cost is expensive, and you must run this mold in the 2K injection molding machine,

Meanwhile, Also will lead to extra cost because of labor cost and assembly costs.

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2K INJECTION MOLDING: THE ULTIMATE FAQ GUIDE

As the professional 2K injection molding manufacturer with 24 years of experience. Kemal pays 100% passion to serve you well.
Here is the FAQ list of the 2K injection molding. You could check any question about the 2K injection molding that you would like to know.
Such as :
What should we pay attention to when designing the mold for 2K injection molding?
What is the clamping sequence of the 2K injection mold?
What is the clamping sequence of the 2K injection mold?
For further communication just feel free to Contact Kemal Team.

Here is the FAQ List:

1. What are the types of 2K injection molding?
2. What are the advantages of 2K injection molding products?
3. What is the working principle 2K injection molding?
4. What are the characteristics of 2K injection molding?
5. What should we pay attention to when designing the mold for 2K injection molding?
6. What is the clamping sequence of the 2K injection mold?
7. What is the clamping sequence of the 2K injection mold?
8. What is the clamping sequence of the 2K injection mold?
9. In 2K injection molding, What is the reason for the product’s appearance of rough edges?
10. In 2K injection molding, what is the cause of product deformation?
11. In 2K injection molding, What is the cause of the flow mark at the gate of the product surface?
12. In 2K injection molding, how to solve the flow mark at the gate of the product surface?
13. How to choose Plastic materials for 2K injection molding?
14. What should be considered when segmenting primary and secondary product materials?
15. How to select the gate in Double injection molding mold?
16. What is the applications of 2K Injection Molding?
17. What is the advantage of 2K Injection Molding?
18. What are the defects of 2K injection molding?
19. How to maintain the 2K injection mold?
20. What are the basic principles of 2K injection molding?

 

1.What are the types of 2K injection molding?

The types of 2K injection molding are as below.
(1) Double injection molding.
(2) Mixed color molding.
(3) Lining molding.
(4) Core pulling type 2K injection mold.

 

2.What are the advantages of 2K injection molding products?

The advantages of 2K injection molding products are as below

  • High precision and stable quality.
  • Good structural strength and durability.
  • Small clearance, good appearance.
  • It reduces the production cost and increases the value of composite products.

 

3.What is the working principle 2K injection molding?

The working principle 2K injection molding is as below:

Two-color injection molding is two different plastic materials in the same injection machine divided into twice molding, but the product only out of the mold once.
This molding process is also known as double injection molding, it works at one set of molds, and requires a special double color injection molding machine.

 

4. What are the characteristics of 2K injection molding?

The characteristics of two-shot Injection Molding are as below:

(1) The two shapes of front mold kernels are different, one product is formed respectively, while the two shapes of rear mold kernels are exactly the same.
(2) After the front and rear mold parts of the mold are rotated 180° from the center (the rear
Mold is rotated 180° and the front die is not moved), they must be identical.
(3) The guide sleeve of the mold blank pillar must be symmetrical up and down, and the front and rear modes must be symmetrical.
(4) Two independent ejector systems, and two ejector rods. The back mold is the same, the thimble is the same, they are the rotation relationship.
(5) In the design of the second injection molding of the front mold kernel, in order to avoid the second front mold kernel insert (or rub) injury of the first molded product glue position, the mold can be designed to avoid it. But the strength of each glue position must be carefully considered. For example, in the injection molding, whether there will be deformation of the plastic under large injection pressure, leading to the possibility of batch front generation in the second injection molding.
(6) Product size of the first injection molding can be slightly larger,
so that it is the second molding can be pressed more tightly with another rear mold, to achieve the role of sealant.
Pay attention to the second injection molding, whether the flow of plastic will impulse the first product has been formed, so that its glue position deformation if this is possible, we must find ways to improve.
(7) In 99% of cases, the hard part of the product is injected first, and then the soft part of the product is injected because the soft part is easy to deform.

 

5.What should we pay attention to when designing the mold for 2K injection molding?

The things that we should pay attention to when designing the mold for 2K injection molding are as below:

  • The nozzle should be as short as possible and the mold part should be as thin as possible. This is the best way to solve the problem of the double injection molding mold joint line.
  • When designing the first shot, ensure the consistency of the mold thickness of the second shot product, so as to prevent the appearance of the second shot surface from shading due to uneven mold thickness. The second shot should be thicker and thinner than the first shot, preferably between 1.5mm and 0.8mm.
  • When designing the first shot, the consistency of the thickness of the meat of the second shot should be ensured to prevent the appearance of the second shot from shading due to the uneven thickness of the meat. The second shot should be thicker and thinner than the first shot, preferably between 1.5 mm and 0.8 mm
  • The outer diameter accuracy of the two locating rings should be the same, preferably 119.90 mm, which ensures that the mold can be better positioned on the molding machine, and solves the problem of clamping difficulty in the upper forming machine. It is also suggested that the upper fixing plate and the mother plate should be connected with the locating pin.
  • The thickness of the two-shot injection mold, male mold and male mold, female mold, and female mold must be the same. The dimension and precision of the guiding device must be the same, the closing height of the mold must be the same.
  • Waterway design to facilitate the installation of the machine, according to the different machine to design.
  • The mold joint is designed as flat as possible to facilitate subsequent fitter assembly.
  • The centers of the two sets of mold should be on the same turning radius, with a difference of 180 degrees.
  • The molding mechanism should be finished after the two shots, so do not set the demould mechanism in the one-shot position.
  • The first Colour Gate shall be covered with a second color, preferably a hot runner point gate or a three-plate mold.
  • The male mold waterway must be designed in the middle of the two molds.

 

6.What is the clamping sequence of the 2K injection mold?

The clamping sequence of the 2K injection mold is as below.

1) When the first injection male mold is matched with the first injection female mold, and the female mold need to be repaired, In case there is a forming surface between the male mold and the second shooting female mold.
2) When the first shooting male mold is matched with the second shooting female mold, and the male mold is modified.
3) The second shooting male mold is matched with the second shooting female mold, and the male mold is modified.
4) The second shooting male model is matched with the first shooting female model and modified according to the situation.

7.In the 2K injection molding test, How to do a better complete the test sample?

If we want to get a better test sample, we should pay attention to that:

1)  The first shot of plastic is harder than the second shot of plastic.
It Prevents the second injection melt resin from melting the first injection product.
2)  Coldwater or frozen water may be required for the first injection mold. This will prevent the product from shrinking due to low temperature

8.In the 2K injection molding, what are the bad effects when the product appears rough edge?

In the 2K injection molding, the bad effects when the product appears rough edge is as below:

  • Low manufacturing efficiency and slow speed.
  • More manufacture manpower.
  • Difficult to manufacture.
  • The quality is not guaranteed and the defect rate is high.

9.In 2K injection molding, What is the reason for the product’s appearance of rough edges?

In 2K injection molding, the reason for the product’s appearance of rough edges are as below:
1) The first color plastics filling is not full
2) Large mating clearance of mold
3) The glue shoots too fast
4) The second color adhesive is overfilled
5) Mold temperature is too high

10. In 2K injection molding, what is the cause of product deformation?

In 2K injection molding, the cause of product deformation are as below:

  • Due to internal stress during demoulding.
  • Mold temperature control due to inadequate or uneven.
  • The flow direction of material or filling material.
  • Due to improper molding conditions.
  • The shape of the molded product, the thickness of the mold, etc.

11.In 2K injection molding, What is the cause of the flow mark at the gate of the product surface?

In 2K injection molding, the cause of the flow mark at the gate of the product surface is as below:

Because the sprue runner is small, a volcanic effect occurs when the material is rushed through the sprue directly into the molded cavity and then at the junction of the first color of plastic.

12.In 2K injection molding, how to solve the flow mark at the gate of the product surface?

  • Change the direction of glue feeding.
  • Change the right angle gate to R isolation.
  • Change R to the sector.
  • Consider the valve needle hot runner mold will not have cold glue, whether it is cold material caused spray marks.

13.How to choose Plastic materials for 2K injection molding?

The second glue melt temperature is lower than the first glue melt temperature. So that It can prevent the second injection when the production of melt adhesive.
The first material is available: PC. Abs. PC + Abs. PMMA…
Second material available: PC. Abs. PC + Abs. Pema. TPU…

 

14.What should be considered when segmenting primary and secondary product materials?

1) To consider the fluidity of raw materials, choose the appropriate wall thickness. If the second mold is too thin, it will lead to material shortage, Weld marks, and other defects.
2) The wall thickness of the primary material should ensure that the primary product will not shrink, So it prevents secondary overflow.
3) The flow direction and speed of the secondary material can be changed to eliminate injection defects.

15.How to select the gate in Double injection molding mold?

For the first gate, Preferentially select the inlet or outlet to ensure that the product.
And the runner can be cut off automatically.
The secondary gate shall not affect the appearance of the product.

16.What is the applications of 2K Injection Molding?

The 2 K Injection Molding process is mainly used in products that need to meet some special function or appearance requirements.
For example, some products need to be waterproof, drop-proof, and dust-proof, some products need to have a variety of colors on the surface to meet the aesthetic requirements, and some products need good grip and touch.
They all need to use two or more materials on a product and need to use 2K injection molding.

 

17.What is the advantage of 2K Injection Molding?

The advantage of 2K Injection Molding are as below:

  • The 2K injection molding can produce a high precision and stable product, which is much more stable than the Over molding production process.
  • The 2K injection molding could increase the product structure strength, make the product more durable, Such as three defense mobile phones and engineering military computers. Improve the surface quality of products and increase the value of products, such as daily supplies products.
  • The 2K injection molding can greatly reduce the production cost and make the products more competitive on the market.
  • The 2K injection molding Can focus on a variety of effects on 2K injection molding products, such as soft sensing surface, ergonomic design scheme, two-color appearance, waterproof, noise reduction, shock absorption, moisture-proof, and anti-skid, can save design space and reduce the total number of parts.

 

18.What are the defects of 2K injection molding?

1) The material selection is very important. Different plastics have different physical properties.
the compatibility mode will directly affect the combination of the two materials. The difference in shrinkage of plastics should be small.
2) The difference greatly affects the joint compressive strength and is likely to lead to shrinkage of the product.
3) The product structure should not be too complicated.

19.How to maintain the 2K injection mold?

  • Check whether there are impurities and dirt in all parts of the mold. For plastics and impurities that remain in the mold, use cotton yarn to scrub and remove the adhesive.
  • Select the clamping force reasonably. High clamping force will increase power consumption and damage the transmission parts.
  • Each transmission part shall be well lubricated and must be kept lubricated.
  • It is not allowed to hit any part of the mold with Hoes and other heavy objects. It can avoid deformation and even damage to the tools.

 

20 What are the basic principles of 2K injection molding?

(1) In 2K injection molding, hard glue once, soft glue twice.
(2) In 2K injection molding, Transparent glue once,non-transparent glue twice.
(3)In 2K injection molding, plastic with high molding temperature once, and plastic with low molding temperature twice.