1) Used in power switches, mobile phone keys, car switches, etc. to meet the requirements of partial light guidance or light transmission.

The two plastics are injected on the same injection moulding machine and moulded twice, but the product only comes out once. Therefore, two-colour injection moulding is usually done by one set of moulds and requires a special two-colour injection moulding machine.

Because of the different chemical properties of different plastics, their compatibility will directly affect the bonding strength and bonding effect of the bonding surface, not all plastics have good compatibility with each other.

Globally recognised within the industry and with a presence beyond just our Sydney base we are a market leader for Plastic Moulding and reflect that in the quality of service you will receive when working with ASP Plastics. We are also actively involved within the community from large scale Government assistance with key decision making down to sponsoring local soccer and rugby clubs, we see the positive impact our presence has on the local community and this is one of our most satisfying achievements.

The chart above can be used as a general selection guide only. It is always best to contact your plastics supplier for a more professional opinion when selecting a specific material type. You can contact us too! info@ptsindu.com

2) The plastic is in a molten state throughout the entire process of two-colour injection moulding, with no cooling shrinkage, which means that there is the opportunity to form a strong chemical link between the base material and the overlay material, with high strength and reduced risk of burrs occurring.

The Draft Angle is important for two-colour injection moulding because it determines which mould the part is attached to during the rotation process.

2k injection moulding is the simultaneous injection of two plastics at once in a dedicated two-colour injection moulding machine.

After the first injection of the base material, the mould is opened and then rotated by 180° using the rotatable structure of the injection machine, then closed the mold and start second shot inejction by using a different colour of material or a different material (covering material) than the first injection.

Therefore, when designing products for two-colour injection moulding，The first and most important thing is to choose the most suitable substrate material and covering material。

3）Products that require a multicoloured appearance, such as keyboards, the use of two-colour injection moulding makes them beautiful without the risk of rubbing off during use.

The different TPE models from RTP, as pictured, differ considerably in their compatibility with plastics, even though they all belong to the TPE range (X indicates good compatibility).

When the internal bonding surface is too small, the roughness can be increased by nibbling on the bonding surface on the one hand, and mechanical interlocking structures can be designed on the other.

2k injection moulding is a type of injection moulding, so DFM design guidelines for injection moulding, such as uniform wall thickness, avoidance of sharp corners and even transitions, must also be observed for 2k injection moulding.

PTS Industrial Ltd is Specializing in precision manufacturing and injection molding parts since 2002. We supply CNC machining (milling&turning) parts and injection molding parts for various industries to customers worldwide.

In addition to being industry leading custom moulder, ASP also hold our own patents and trade marks, on over 200 of our own products.

Plastics are different, their chemical properties are different, and their compatibility will directly affect the bonding strength and bonding effect of2 K injection moulding/double injection molding.

On the first injection, the part should be attached to the moving mould; on the second injection, the part should be attached to the ejector side of the mould.

The first injection of the base material and the second injection of the cover material are injected out simultaneously, requiring two injection nozzles on the injection machine, each injecting a different colour or a different base material and cover material.

2）Application to hand-held products such as walkie-talkie housings, toothbrush handles, power tool handles, spanners and thermoses to improve feel.

Today I’m going to show you an article to let you understand 2k injection molding in 2022!(2k Injection Molding Factory/Expert/Supplier based on China.)

After the second opening of the mould, the moving mould, which has already been injected twice, will ejected the plastic 2k part.

Welcome to ASP Plastics, a Western Sydney based specialist in Plastic Injection Moulding and Blow Moulding services, which has been exceeding our clients requirements since 1960. With over eight acres of land and large amounts of high-tech machinery to support both Injection Moulding and Blow moulding, ASP Plastics are a perfect solution to fulfil your business needs.

In the plastics family, only ABS and polysulfone (PSU) surfaces can be plated. If a partial area or a single side of the product requires plating, the plated area should be injected with ABS and the area that does not require plating should be injected with other materials such as PC.

The weight difference between the base material and the cover material should not be too big different, otherwise it will affect the moulding cycle and injection pressure etc.

ASP Plastics won the Western Sydney Industry Award several times in the last years including 2004, 2005, 2006, 2007 and 2008.

3) Compared to insert/overmold injection moulding, 2k injection moulding does not require the insertion of inserts, resulting in shorter and more efficient moulding cycles, as well as higher quality.

A toothbrush is a product that combines hard and soft plastics. A hard plastic is used for the main part of the toothbrush to provide sufficient strength; a soft plastic is used for the part that comes into contact with the hand to ensure a tactile feel; at the same time two-colour injection moulding provides the toothbrush with a colourful appearance.

In this article, the first injected material is referred to as the base material and the second injected material is referred to as the overlay material.

The design of the Cosmetic mating surface at the first and second injection is very challenging and must provide sufficient bonding strength, otherwise flying edges, burrs, rolled edges and flaking can easily occur, especially in 2k injection moulding of hard and soft plastics. Common Cosmetic mating surface designs include stepped and fluted.

Please contact us today to discuss your requirements in more detail or indeed arrange an appointment to visit ASP Plastics premises and plan your project with our expert team.

2k injection molding（2shot injection molding or double shot injection molding）is a manufacturing process used when referring to molding two materials/colors into one plastic part. This plastic molding technology blends two materials or two different colours materials into one ending plastic part by using 2k injection molding machine.

Despite focussing primarily on Plastic Moulding we also boast a Clean Room which is one of Australia’s largest and most advanced at 12,300 square feet and can also support Tool Making and Sonic Welding services. Our broad range of services allow our clients to complete their projects to the highest standard and we have nothing but positive feedback on our machinery, our facilities and our service overall.

The strength of the bond between the base material and the cover material depends on the compatibility between the materials, the process temperature, the bonding surface, the moulding sequence and the design of the internal bonding surface mechanical interlocking structure.

2)The difference between the melting temperature of the base material and the covering material does not exceed 30-60°. The melting temperatures of common plastics are shown in the following chart.

After the 1st injection, if the surface of the part fits directly into another fixed mould, it should be ensured that the plane has a sufficiently large release slope to avoid scratching when the mould is closed.

2 shot injection moulding can integrate multiple functions into one plastic part, such as soft-sensitive surfaces, ergonomic design, two-colour appearance, brand identity, feature improvement, noise reduction, shock absorption, water resistance and impact protection, saving design space and reducing the number of components, etc.

(1) Insert/over moulding is done using a common injection moulding machine, where the product is taken out from one mould and then put into another mould for a second injection moulding.