Hot channel device
AssigneeEwikon Heisskanalsysteme GmbH & Co. KG
InventorsPeter Braun, Stefan Eimeke
Life of this patent
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Abstract
A hot channel device for guiding an incoming hot melt, in particular a plastic melt, to a gate opening of a mould insert of a tool, which gate opening can be opened and closed again by a movable needle, wherein the hot channel device has a first hot channel region, with a coolable melt transfer region, and a second hot channel region, which are arranged one behind the other in the flow direction of the melt toward the mould insert, wherein the coolable melt transfer region has a melt transfer chamber, which is penetrated by the needle, said needle being guided displaceably in a needle channel so as to be sealed by a needle seal, and the needle channel continues in an aligned manner in a melt channel of the second hot channel region.
Claims25
Hot channel device for conveying incoming hot melt to a gate opening of a mold insert of a mold, which gate opening can be opened and reclosed by a movable needle, wherein the hot channel device has a first hot channel region with a coolable melt transfer region and a second hot channel region, which are arranged one behind the other in the flow direction of the melt in the direction of the mold insert, characterized in that the coolable melt transfer region has a melt transfer chamber through which the needle passes, which is displaceably guided in a needle channel in a sealed manner with a needle seal, and the needle channel is continued in alignment in a melt channel of the second hot channel region, wherein a melt conducting element of the first hot channel region projects into the melt transfer chamber without touching the melt transfer chamber.
Method for operating a hot channel device for conveying incoming hot melt to a gate opening of a mold insert of a mold, which gate opening can be opened and reclosed by a movable needle, wherein the hot channel device has a first hot channel region with a coolable melt transfer region and a second hot channel region, which are arranged one behind the other in the flow direction of the melt in the direction of the mold insert, characterized in that the coolable melt transfer region has a melt transfer chamber through which the needle passes, which is displaceably guided in a needle channel in a sealed manner with a needle seal, and the needle channel is continued in alignment in a melt channel of the second hot channel region, wherein a melt conducting element of the first hot channel region projects into the melt transfer chamber without touching the melt transfer chamber, wherein an injection molding melt is fed into the hot channel device and through this to the mold insert,
- a) the first hot channel region is temperature-controlled above the glass transition temperature or above the crystallite melting temperature of the melt,
- b) and the subsequent melt transfer region is temperature-controlled below the glass transition temperature or below the crystallite melting temperature of the melt, wherein a flow passage for the melt is maintained in the melt channel,
- c) and the subsequent second hot channel region is temperature-controlled above the glass transition temperature or above the crystallite melting temperature of the melt.
Dependencies are inferred from the claim text.