The Jaroschek Displacement Process

As one of a series of technology transfer and equipment supply deals between Gas Injection Worldwide Limited and GAIN Technologies, GIWW has acquired exclusive rights outside USA and Japan to use, sub-license, and enforce all currently viable patents owned by or licensed to GAIN Technologies – the GAIN PATENTS – all related to injection moulding.

Most importantly are Patents US 5204051, US 5423667, EPO 393315B2 and JP 2510754 with the inventor’s name Christoph Jaroschek. These Patents are owned by Ferromatik Milacron Desma GmbH but in May 2003 Ferromatik granted GAIN sole rights to use, sub-license and enforce the Jaroschek Patents worldwide. By earlier agreement with GAIN, Maximator in Germany and Ferromatik may non-exclusively grant sub-licenses to their customers. Please see diagrams below for graphical representations of the patents. 

The Jaroschek Displacement Process enables precisely controlled displacement of still molten plastic from thicker sections of the moulded component, thereby reducing moulding weights and time cycles, and improving surface quality.

There are three versions of JDP (shown in the diagrams below) which are based on:-
First, completely filling a mould cavity with molten plastic, allowing a solid plastic wall to form adjacent to the mould cavity surfaces, and then injecting a pressurised gas, normally nitrogen, to displace still molten plastic either into one or more side cavities of preselected volume(s) OR back into the machine cylinder (JDP Version 3).

Version 1 Gas in Machine Nozzle Plastic into Side Cavities
“injecting a pressurised flowable plastic melt (4) into a mould cavity (7)”…first being filled completely with molten plastic (4), the connections to the side cavities being closed by stoppers (20, 21) and the still molten core of the plastic body only then being displaced under pressure of the gas (13) when the valves (20, 21) are open into at least one side cavity (18, 19).   Molten Plastic   Solid Plastic   Nitrogen Gas
Version 2 Gas In Mould, Plastic into Side Cavities
“injecting a pressurised flowable plastic melt (4) into a mould cavity (7)”…first being filled completely with molten plastic (4) then injecting pressurised fluid (nitrogen gas) from at least one nozzle or pin (22) located in the mould and into the plastic to displace the interior of flowable plastic melt (4) into at least one side cavity (18,19)…then moving forward the stoppers (20,21) to move a plug of plastic (24) into the plastic side wall (5), thereby filling the hole(s) and creating a smooth surface on the moulded product.   Molten Plastic   Solid Plastic   Nitrogen Gas
Version 3 Gas In Mould, Plastic Back into Cylinder
“similar to Version 1 and Version 2, when completely filling the mould cavity (7) with molten plastic (4) and then injecting nitrogen gas (13) but instead of displacing plastic melt (4) into side cavities, it is displaced back into the injecting machine cylinder (1) at the same time moving the screw (2) backwards to create space for the displaced plastic melt”.   Molten Plastic   Solid Plastic   Nitrogen Gas