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CN-116887968-B - Diverter plate, diverter having a diverter plate, extrusion assembly having a diverter, and method for manufacturing a diverter plate

CN116887968BCN 116887968 BCN116887968 BCN 116887968BCN-116887968-B

Abstract

The invention relates to a diverter plate (1) for a diverter (40) for supplying a thermoplastic melt to at least one extrusion head (61) for producing a preform, the diverter plate (1) comprising a first plate side (2) and a second plate side (3), a diverter groove (7) incorporated in the first plate side (2) and extending in a plate plane (E1) of the first plate side (2), and at least one connecting channel (9) adjoining the diverter groove (7), which is machined into the diverter plate (1) and ends at an outlet opening (10) in the second plate side (3), characterized in that the at least one connecting channel (9) is milled into the diverter plate (1) and has a trajectory which curves at least sectionally in the flow direction towards the second plate side (3). The invention further relates to a method for producing a diverter plate (1). Furthermore, the invention relates to a diverter (40) and an extrusion assembly (60).

Inventors

  • WOLF THOMAS
  • J. Mosler

Assignees

  • W·米勒有限公司

Dates

Publication Date
20260512
Application Date
20220125
Priority Date
20210201

Claims (15)

  1. 1. A diverter tube sheet (1) for a diverter tube (40) for supplying a thermoplastic melt to at least one extrusion head (61) for producing a preform, the diverter tube sheet (1) comprising: A first plate side (2) and a second plate side (3), A distribution groove (7) formed in the first plate side (2) and extending in a plate plane (E1) of the first plate side (2), and At least one connecting channel (9) adjoining the distribution groove (7), which is integrated in the splitter plate (1) and ends at an outlet opening (10) of the second plate side (3), It is characterized in that the method comprises the steps of, The at least one connecting channel (9) is milled into the flow dividing tube sheet (1) and has a trajectory which curves at least sectionally in the flow direction towards the second sheet side (3).
  2. 2. The shunt tube sheet (1) according to claim 1, characterized in that the at least one connecting channel (9) defines a trajectory line (L) and has a curved section (12), the trajectory line (L) in the curved section (12) being curved in the flow direction towards the second sheet side (3).
  3. 3. The flow dividing tube plate (1) according to claim 2, characterized in that the curved section (12) of the at least one connecting channel (9) is formed on the inlet side as a groove opening perpendicular to the trajectory line (L) and on the outlet side as a conduit closed in the circumferential direction around the trajectory line (L).
  4. 4. The flow dividing tube sheet (1) according to claim 2, characterized in that the at least one connecting channel (9) has an inlet section (11) extending in the plate plane (E1) of the first plate side (2) upstream of the bending section (12), which inlet section (11) is designed to open into a recess of the plate plane (E1) of the first plate side (2).
  5. 5. The flow dividing tube sheet (1) according to claim 2, characterized in that a tangent (T1) of the trajectory line (L) in the curved section (12) encloses an angle (a) of more than 0 degrees and less than 60 degrees with the sheet plane (E1) of the first sheet side (2).
  6. 6. The flow dividing tube sheet (1) according to claim 2, characterized in that the at least one connecting channel (9) has a further bending section (15) downstream of the bending section (12), in which further bending section the track line (L) is bent in the flow direction towards the second sheet side (3).
  7. 7. The flow dividing tube sheet (1) according to claim 6, characterized in that the at least one connecting channel (9) has a transition section (14) between the curved section (12) and the further curved section (15), in which transition section the track line (L) is straight.
  8. 8. The flow dividing tube sheet (1) according to claim 2, characterized in that the at least one connecting channel (9) has an outlet section (16) ending at the outlet opening (10), the trajectory line (L) in the outlet section (16) being straight and extending transversely to the first sheet side (2).
  9. 9. The flow distribution tube sheet (1) according to claim 1, characterized in that the first plate side (2) and the second plate side (3) are outer sides of the flow distribution tube sheet (1) facing away from each other.
  10. 10. The flow dividing tube plate (1) according to claim 1, characterized in that the distribution groove (7) is divided into exactly one or two of the connection channels (9).
  11. 11. The flow distribution tube sheet (1) according to claim 1, characterized in that the flow distribution tube sheet (1) has one of the distribution grooves (7) for each extrusion head (61).
  12. 12. -A shunt tube (40) for supplying a thermoplastic melt to at least one extrusion head (61) for producing a preform, the shunt tube (40) comprising at least one shunt tube sheet (1) according to any one of claims 1 to 11 and a cover plate (41).
  13. 13. Extrusion assembly (60) comprising a shunt tube (40) according to claim 12, and at least one extrusion head (61) for producing a preform.
  14. 14. Method of manufacturing a tubesheet (1) according to any of claims 1 to 11, the method comprising the steps of: -machining a distribution groove (7) in a first plate side (2) of a workpiece (27), and -Machining at least one connecting channel (9) into the workpiece (27) by path-controlled form milling, the milling head (32) starting from the first plate side (2) moving at least partly on a path curving towards the second plate side (3).
  15. 15. The method according to claim 14, characterized in that a first section of the at least one connecting channel (9) starting from the first plate side (2) and a second section of the at least one connecting channel (9) starting from the second plate side (3) are formed into the workpiece (27) by means of path-controlled form milling.

Description

Diverter plate, diverter having a diverter plate, extrusion assembly having a diverter, and method for manufacturing a diverter plate Technical Field The invention relates to a diverter tube sheet for a diverter tube for supplying a thermoplastic melt to at least one extrusion head for producing a preform, in particular a tubular preform. The distribution tube sheet comprises a first plate side and a second plate side, a distribution groove formed in the first plate side and extending in a plate plane of the first plate side, and at least one connection channel adjoining the distribution groove and formed in the distribution tube sheet and ending at an outlet opening in the second plate side. The invention also relates to a shunt tube with at least one shunt tube plate. Such a shunt can also be referred to as a melt distributor. Furthermore, the present invention relates to an extrusion assembly comprising a shunt. Furthermore, the invention relates to a method for producing a splitter tube sheet. Background US 3,561,053A discloses a melt distributor having two split tube sheets abutting against each other along a parting plane. The distribution network for distributing the thermoplastic melt to the four mass outlets extends in a parting plane, into which the melt conveyed by the extruder is fed via a central mass inlet. The distribution network has distribution channels incorporated into the facing first plate sides of the splitter tube sheets and fed by a central main channel. The distribution channels are in turn each divided into two connection channels, each of which ends at one of the mass outlets. However, because the distribution network is formed only in the parting plane, the shunt tubes or shunt tube sheets are only suitable for producing single-layer preforms. Melt dispensers for producing multilayer preforms are also known from the prior art. This type of shunt tube has a plate package with several shunt tube plates, each of which rest against each other along a horizontal parting plane. The distribution channels extend in respective parting planes and are incorporated as grooves in the facing sides of the flow dividing tube sheet. The ends of the distribution channels are connected to inlet and outlet holes drilled perpendicular to the parting plane, which connect the distribution channels to the inlet and outlet openings of the plate package. It is considered disadvantageous to create a flow dead zone at the transition between the distribution channel and the orifice, in which the plastic melt accumulates and can only flow out after a certain, possibly longer, residence time. This is particularly problematic in the case of color or material changes, as this increases the conversion time and thus the amount of scrap. DE 10 2019 009 151 B3 discloses a melt distributor made of one-piece parts. The melt distributor is manufactured using a die-free additive manufacturing process of metallic material. Due to the 3D manufacturing, the transition between the tubes via which the plastic melt is fed to the outlet opening may be formed rounded, i.e. not straight. This is to avoid dead flow areas. Such additive manufacturing provides a large degree of geometrical freedom. However, due to the layered structure inherent in the additive manufacturing process, the surface of the tube is stepped or roughened, which is considered a disadvantage, which increases the cleaning effort of the melt distributor. DE 10 201 9 009 151B3 also describes such prior art, in which each trouser line divides the melt stream into two different melt streams. For this purpose, a linear supply line section in the form of a bore is arranged in the upper plate. In the lower plate, two straight shunt line sections are arranged in the form of holes, which are connected to the respective supply line sections via channels. In the parting plane, half of the channels are milled into the upper plate and half into the lower plate. Thus, the rectilinear supply line section and the two rectilinear discharge line sections connected thereto form a trouser line. Disclosure of Invention It is an object of the present invention to provide a flow dividing tube sheet in which dead flow areas are avoided and which is easy to clean. It is a further object of the present invention to provide a shunt in which dead flow areas are avoided and which is easy to clean. Furthermore, it is an object of the present invention to provide an improved extrusion assembly which avoids dead flow areas and which is easy to clean. Furthermore, it is an object of the present invention to provide a method of manufacturing a flow distributing tube sheet which avoids dead flow areas and which is easy to clean. One solution is a flow distribution tube plate of the above-mentioned type, in which at least one connecting channel is milled into the flow distribution tube plate and has an at least partially curved trajectory in the flow direction towards the side of the second pl