en.Wedoany.com Reported - ENGEL has introduced a compact new machine concept for the Clearmelt process, reducing investment and operating costs by shortening the polyurethane supply line length while enhancing equipment operational flexibility.

The Clearmelt process has been used in mass production for many years. It covers plastic parts with a transparent or any color polyurethane layer inside the injection mold, giving the surface high quality and scratch resistance while allowing the integration of functional films, eliminating the need for subsequent spraying or coating steps. ENGEL states that based on the Combi-M structure of its duo series injection molding machines (a two-platen injection molding machine), the new machine concept eliminates the standard injection unit on the stationary platen side and replaces it with polyurethane coating equipment. The thermoplastic component is injected from the moving platen side, and the PUR mixing head is located on the stationary platen, bringing the polyurethane technology closer to the mold and allowing the supply lines to be designed shorter.

ENGEL points out that the new layout makes the machine periphery more compact, easier to operate, faster to change over, and lower in operating costs. A mirrored version is also available, where the injection unit position keeps material supply on one side, seamlessly integrating into existing workshop logistics without requiring modifications to the production environment.

For users, the significant shortening of the polyurethane line path is a major advantage. The PUR equipment is mounted directly on the stationary platen, greatly reducing runner and line volumes, thereby lowering investment costs. Installation effort is also reduced, as expensive piping is no longer needed. This advantage is particularly prominent in multi-color applications, where each color does not require a separate line; shorter lines and the elimination of moving hoses further reduce the investment cost of Clearmelt equipment. ENGEL states that only a brief disconnection of existing hose connections is needed when changing PUR equipment.

The new equipment also allows more flexible use of color units. Previously, color units were fixedly connected to a single machine, and unused color lines had to be continuously circulated to prevent pigment particles and additives from separating. ENGEL emphasizes that this is no longer necessary; the line flushing process for separating color units is completely eliminated, and color changes can be completed within ten minutes.

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