Variant of high-pressure injection moulding

Sequential injection moulding

Sequential injection moulding is a variant of high-pressure injection moulding where the plastic is injected into the mould through various openings (gates). These injections are sequential rather than simultaneous. The FLUX chair (see case study) is an excellent example of this technique. Sequential injection moulding can also be combined with structural foam moulding.

Large products with thin walls

One of the main advantages of this process is that it allows you to manufacture large products with thin walls. The most extreme example of a product that HSV has created using this technique is the mount for SOLON (see photo), which is produced using 17 gates. First of all, 5 gates are opened and part of the mould is filled. These are then closed and the other 12 gates are opened to fill the rest of the product.

Advantages of sequential injection moulding:

  • Possible to manufacture large products
  • Weld lines (points where melted plastic flows together) are significantly reduced

Points to consider with sequential injection moulding:

  • The injection system is more expensive due to the use of needle valves

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About us: Introduction

Are you looking for a partner who can support you with the development of your plastic products due to practical experience? At HSV TMP we have decades of experience in the development of plastic components and a wealth of knowledge when it comes to the materials and techniques required.


Company profile

An increasing number of designers and purchasers are opting for plastic

HSV TMP is one of Europe’s leading companies when it comes to manufacturing large plastic products. At our factories in Ede and Leeuwarden we develop and produce innovative housings, fittings and other components for customers in a diverse range of sectors.

Company profile


Our history and organisational structure

The history of HSV Technical Moulded Parts (HSV TMP) can be traced back to the foundation of our sister company, HSV Moulded Foams. This company – like HSV TMP now a separate division of the HSV Group – started manufacturing EPS packaging at a production location in Ede in 1968.

Are you looking for a plastic solution? HSV TMP is happy to help you make it a reality.

Core Values

How we do business

We are convinced that our customers not only work with us because of the products we supply, but also because of the way we do business. We have broken down this approach into 4 core values.

Core values

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