Einzeltreffer — DigiBib

A neck block of a molding tool for the production of a hollow body preform by means of injection molding, wherein the neck block has a main body with a shaping surface which is adapted to the external contour of a neck portion of the hollow body preform to be produced and is provided to come into contact in the injection molding operation with the neck portion of the hollow body preform, wherein furthermore there is provided at least one cooling passage for a cooling fluid which at least portion-wise extends substantially parallel to the shaping surface. The neck block is further provided with an inlet and an outlet and an inlet passage and an outlet passage which connect the inlet and the outlet respectively to the cooling passage. The cooling passage is arranged closer to the shaping surface than the inlet and the outlet. The cooling passage has at least one portion which extends substantially parallel to the shaping surface and which extends within the main body so that the walls thereof are formed by the main body, and a connecting portion which adjoins said portion and the walls of which are formed in part by the main body and in part by a closure element fitted onto the main body.

Titel:	Neck block cooling
Autor/in / Beteiligte Person:	Neter, Witold ; Hoenisch, Marek ; Wegmann, Klaus ; Schweininger, Stefan ; Wagner, Christian
Link:	View record in USPTO Patent Grants (Volltext)
Veröffentlichung:	2011
Medientyp:	Patent
Sonstiges:	Nachgewiesen in: USPTO Patent Grants Sprachen: English Patent Number: 8,002,540 Publication Date: August 23, 2011 Appl. No: 12/223565 Application Filed: November 28, 2006 Assignees: MHT Mold & Hotrunner Technology AG (Hochheim, DE) Claim: 1. A neck block of a molding tool for the production of a hollow body preform by means of injection molding, wherein the neck block has a main body with a shaping surface which is adapted to the external contour of a neck portion of the hollow body preform to be produced and is provided to come into contact in the injection molding operation with the neck portion of the hollow body preform, wherein furthermore there are provided at least one cooling passage for a cooling fluid which at least portion-wise extend substantially parallel to the shaping surface, an inlet and an outlet and an inlet passage and an outlet passage which connect the inlet and the outlet respectively to the cooling passage, wherein the cooling passage is arranged closer to the shaping surface than the inlet and the outlet, where the cooling passage has at least one portion which extend substantially parallel to the shaping surface and which extends within the main body so that all of the walls of the portion which extends within the main body are formed by the main body, and a connecting portion which adjoins said portion and the walls of which are formed in part by the main body and in part by a closure element fitted onto the main body and a cross-section of the connecting portion walls are formed in part by the main body an in part by the closure element. Claim: 2. A neck block according to claim 1 wherein the shaping surface forms at least a portion of a negative shape of a screwthread. Claim: 3. A neck block according to claim 1 wherein the shaping surface comprises portions which are substantially in the form of a surface corresponding to the periphery of a partial cylinder or to the shape of the periphery of a partial truncated cone, wherein the axes of the part-cylindrical portions and the axes of the part-frustoconical portions are disposed on an axis, referred to as the neck block axis. Claim: 4. A neck block according to claim 1 wherein at least in part the cooling passage is branched so that at least two different flow paths are formed for the cooling fluid when flowing through the neck block from the inlet to the outlet. Claim: 5. A neck block according to claim 4 wherein the cooling passage has a plurality of mutually adjoining substantially straight portions, wherein connecting locations are formed between two portions and wherein the passage axes of each two respective mutually adjoining portions are not arranged in mutually co-linear relationship. Claim: 6. A neck block according to claim 5 wherein the passage axes of each two respective mutually adjoining portions include an angle between 30° and 100°. Claim: 7. A neck block according to claim 5 wherein the adjoining portions are arranged inclinedly with respect to the neck block axis. Claim: 8. A neck block according to claim 7 wherein at least each second connecting location between mutually adjoining portions forms a connecting portion of the cooling passage, the passage wall of which is at least partly formed by the closure element. Claim: 9. A neck block according to claim 5 wherein the cooling passage has a multiplicity of mutually adjoining portions, wherein each second one of the multiplicity of mutually adjoining portions is a horizontal portion arranged substantially perpendicularly to the neck block axis and a horizontal portion is always connected to a further horizontal portion by way of a vertical portion which is inclined at an angle of less than 60° with respect to the neck block axis. Claim: 10. A neck block according to claim 9 wherein the passage walls of at least each fourth and preferably each second portion of the multiplicity of mutually adjoining portions is formed in part by the closure element. Claim: 11. A neck block according to claim 9 wherein the cooling passage has at least portion-wise alternately horizontal portions and vertical portions which are so arranged that the fluid is guided in a meander form at least portion-wise by the cooling passage. Claim: 12. A neck block according to claim 9 wherein the cooling passage has precisely two horizontal portions and at least two vertical portions which connect the horizontal portions and which are so arranged that the fluid entering the neck block through the inlet is passed through the inlet passage to the first of the horizontal portions, from same by way of the at least two vertical portions to the second horizontal portion and further to the outlet passage and to the outlet. Claim: 13. A neck block according to claim 1 wherein the main body has a face which is remote from the shaping surface and which is of a conical configuration, wherein the conical face is provided to come into contact with another component of the injection molding tool during the injection molding operation. Claim: 14. A neck block according to claim 13 wherein the cooling passage is arranged substantially in a region of the main body between the shaping surface and the conical face. Claim: 15. A neck block according to claim 1 wherein the cooling passage has a curved portion, the walls of which are formed by the main body of neck block and only at one or both ends at least in part by the closure element. Claim: 16. A neck block according to claim 15 wherein the cooling passage has precisely two curved portions which are spaced in the direction of the axis of the neck block and which are connected together at least one end with a connecting portion, wherein the walls of at least one of the connecting portion are at least in part formed by the closure element. Claim: 17. A neck block according to claim 1 wherein the cooling passage is of a non-circular cross-section, preferably a rectangular, square, oval or sickle-shaped cross-section. Claim: 18. A neck block according to claim 1 wherein the closure element has grooves or recesses for guiding the fluid. Claim: 19. An injection molding mold for the production of hollow body preforms wherein it has at least one neck block according to claim 1 . Claim: 20. A neck block of a molding tool for the production of a hollow body preform by means of injection molding, wherein the neck block has a main body with a shaping surface which is adapted to the external contour of a neck portion of the hollow body preform to be produced and is provided to come into contact in the injection molding operation with the neck portion of the hollow body preform, wherein furthermore there are provided at least one cooling passage for a cooling fluid which at least portion-wise extends substantially parallel to the shaping surface, an inlet and an outlet and an inlet passage and an outlet passage which connect the inlet and the outlet respectively to the cooling passage, wherein the cooling passage is arranged closer to the shaping surface than the inlet and the outlet, wherein the cooling passage has at least one portion which extends substantially parallel to the shaping surface and which extends within the main body so that all of the walls of the portion which extends within the main body are formed by the main body, and a connecting portion which adjoins said portion and the walls of which are formed in part by the main body and in part by a closure element fitted onto the main body, wherein the main body has a face which is remote from the shaping surface and which is of a conical configuration, wherein the conical face is provided to come into contact with another component of the injection molding tool during the injection molding operation wherein the conical face is formed by a separate cone portion which is in the form of a closure element. Current U.S. Class: 425/552 Patent References Cited: 4017242 April 1977 Mercer ; 5599567 February 1997 Gellert ; 5607702 March 1997 Havakawa et al. ; 5930882 August 1999 Gellert ; 6444159 September 2002 Petre ; 6488881 December 2002 Gellert ; 6547553 April 2003 Koch et al. ; 7234930 June 2007 Niewels et al. ; 19642060 April 1997 ; 19908936 September 2000 ; 69618888 June 2002 ; WO 2006/128275 December 2006 Primary Examiner: Heitbrink, Jill L Attorney, Agent or Firm: Dunn, Michael L.

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Neck block cooling