Injection moulding tools for maximum productivity.

Innovative mould technology characterises Hofmann – Ihr Impulsgeber. We offer our customers high-performance moulds ensuring maximum productivity thanks to the shortest possible cycle times and long service life. This is possible thanks to distinct simulations and consistent part optimisation, which is why we have a large team of experienced employees, especially in the area of design. The result is injection moulding tools which satisfy the most stringent requirements.

Multi-component injection moulding

Multi-component injection moulding is a speciality of Hofmann – Ihr Impulsgeber. Moulds which process a variety of different plastics are efficient and functional. This opens up loads of options for the user. It is precisely these complex components which require a special degree of expertise and precision, such as in the design and implementation of the gating system. This is just one reason why you can trust Hofmann – Ihr Impulsgeber when it comes to multi-component injection moulding.

Variotherm®

Through our in-depth research and development work, we create innovative ideas for our customers on a regular basis. One result of these efforts is the exclusive Variotherm® technology. Whereas with conventional injection moulding processes the mould maintains a constant temperature to the greatest degree possible, Variotherm® involves the alternating heating and cooling of the injection moulding tool. This opens up wide-ranging possibilities, such as parts with no visible joint lines, a high-gloss surface and minimal distortion. Laborious finishing work, like painting, is thus eliminated.

Gas and water injection

Gas and water injection are especially ideal for the economical production of thick-walled or hollow parts where the material at the core of the item is flushed out using a fluid (gas or water). This material is either led into an overflow cavity or can be conveyed back into the screw via the hot runner, making it available again for the next cycle. In addition to thick-walled parts (e.g. handles, pedals etc.), gas and water injection are also suitable for media lines made of plastic (e.g. moulded tubes for air conditioners and cooling water).

SkinForm® / Direct Skinning und ColorForm® / Direct Coating / Clearmelt

ColorForm® technology is a process for the production of parts with a high-quality premium surface for an economical price. In a one-step process, injection moulding technology is combined with PUR reaction chemistry to create ColorForm® technology. Here, a plastic injection moulding carrier is injected first. It is then moved to a second cavity in the mould, where it is then flooded over with polyurethane/polyurea. Both injection moulding and the coating process occur directly in the mould. ColorForm® technology thus makes it possible to replace classical painting processes. SkinForm® technology functions according to the same principle, except that foamed polyurethanes are used here. This makes it possible to produce parts with a soft-touch surface, for example.

Multi-daylight and tandem injection moulding

The use of a multi-daylight mould is often recommended for large, flat parts and high quantities. By arranging the parts one after another in two main divisions, multiple items can be produced with a slightly higher required closing force in comparison to one main division.

Tandem injection moulding also offers the advantage of being able to produce items of different sizes with the same material. Production costs can be reduced by up to 40 %, as injection always only occurs on one of the parting lines (the other one is in the cooling phase during this time).

IMD film and material back injection

IMD and film back injection enable the refinement of even highly complex curved parts with symbols, transmitted light technology and multi-colour two-dimensional decorations in a convenient and time-saving way during the injection moulding process. The back injection of textiles is also an economical alternative to the work-intensive lamination of plastic parts.

Injection compression moulding

In contrast to conventional injection moulding, injection compression moulding involves injection into the slightly open mould and the cavity not closing until during the solidification process. This enables a more direct and event transmission of force to the molten plastic. In contrast to conventional production, parts produced with injection compression moulding technology exhibit less distortion and intrinsic tension. As thinner walls in comparison to injection moulding are possible at the same time, the technology is also very economical.

Assembly injection moulding

Assembly injection moulding combines joining and assembly processes directly during injection moulding. This enables additional parts to be injected on directly without welding or adhesion. This enables the movable or fixed connection of multiple parts. The fact that all this takes place in a single mould means that this technology is especially economical.

Insert injection moulding

With insert technology moulds, pre-fabricated metal parts are inserted into the mould and over-moulded. The combination of metal and plastic creates hybrid parts which exhibit the advantages of both materials. Thanks to the great wealth of experience in this area gathered by Hofmann – Ihr Impulsgeber over many years, the most stringent precision requirements and tolerances of these parts can be implemented in a targeted and efficient way.