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Plastics Processing

The requirement determines the correct procedure! Whether 1-, 2- or 3-component injection moulding, foam injection moulding or gas injection moulding + 2K combination processes, we offer you the optimum solution for every task. With our modern injection moulding machines with closing forces of 800 RN to 24,000 kN, high-quality and economical injection moulding products are created for every requirement profile. All machines are connected to a production data acquisition and are fully automatic.

Validation & Qualification

Our APQP and process optimising team takes product and process validation measures to ensure consistent and high-quality serial production of components, modules and systems in accordance with the client’s specifications and also uses statistical methods to avoid errors.

MuCell® Processes

The MuCell® process is a physical foaming technology of thermoplastics. The process offers the economic advantage of weight reduction and ensures the reduction of sink marks. With the MuCell® process, customers' economic and technical requirements can be met and implemented.

Advantages of the MuCell process:

  • Weight reduction of the component
  • Less material used
  • Shorter cycle times
  • Reduction of sink marks

Multi-Component Injection Moulding

Multi-Component Injection Moulding is used to denote the sequential composition of one tool from several moulded parts during the injection process.

Coko draws on a long history of experience. With clamping forces of up to 7000KN and rotary plate diameters up to 1400mm, Coko has the skills to truly stand out.

In component design, there are almost no limits to the imagination.

Coko can produce the following multi-component products for you.

  • Rotary plates
  • Rotary tools
  • Rotating hubs and cores
  • Transfer and insert technology
  • Core back technology

These types of mutli-component technology enable e.g.

  • Mobile bonds during injection moulding (assembly injection moulding)
  • Multi-Component Injection Moulding (hard / hard & hard / soft)
  • Sandwich injection moulding (lightweight construction via an integrated foam structure)
  • 3D-MID (moulded interconnect devices) (component integration by conductor tracks)
  • ... and much more

Linked Assembly Injection Moulding

Assembly lines behind the injection moulding devices allow entire modules to be completed. This automated process allows components to be combined, a variety of assembly technologies to be used and enables integration of test processes for 100% quality checking, including component labelling.

Injection Moulding with Inline Printing

Climate-controlled pad printing linked with the injection moulding machine ensures a high degree of process safety.
Coko uses this technique for orders with a large number of parts, with printing possible on slightly curved surfaces and in multiple colours.

GID Processes - Internal Gas-Assisted Injection Moulding

The internal gas-assisted process uses a unique moulding post filling composed of two fluids. Liquid thermoplastics of the desired viscosity make up the first constituent while the second is made of gas - usually nitrogen (N2). After the mould filling, the gas then flows into the core of the molten mass. The fluids generally do not mix. A foam structure, such as is desired in a TSG process (foaming), cannot be achieved with GID and is not the desired result. In comparison to the classic multi-component technique (sandwich process) with two molten masses, gas as a second constituent has two significant properties:

  • negligible viscosity
  • high compressibility

This means a number of differences compared to the sandwich technique.

However some component guidelines must be observed in order to ensure the success of this process.

TSG Processes

In the Thermoplastic Foam Injection Moulding Process (TSG) moulded technical parts are made with a foam core and non-foam surface layers, so-called integral foams. In principle, the TSG process can be applied to a variety of injection moulding products. But the surface will always maintain a silvery texture. If these items are supposed to have high-spec surfaces, then the components need to be sanded and lacquered.

Tandem Technology

When two similar plastic components with different shot weights are supposed to be produced using the same machine for economic reasons, then tandem technology offers a clear financial advantage. If both parts are to be automatically assembled or welded together then tandem technology is the preferred process.
Coko has the machine technologies required in a range of different clamping forces.

Do you have any more questions? Contact us:

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