Extruder system for extruding cord reinforced extrudate

a technology of extruder and extruder head, which is applied in the direction of additive manufacturing process, other domestic articles, coatings, etc., can solve the problems of non-uniform thickness and/or density across the width of the extruder, uneven flow rate, and non-uniform extrusion material that leaves the extruder head, so as to improve the uniformity of the extrusion material

Inactive Publication Date: 2020-12-31
VMI HOLLAND BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent text describes a system that can distribute extrusion material evenly throughout the system, regardless of the orientation of the extruders or the direction in which the material is supplied. This results in a more uniform distribution of the material, which ultimately leads to a more uniform extruded product. In one embodiment, the system ensures that the compounds are supplied to the system at the same pressure, which further improves the uniformity of the extruded product.

Problems solved by technology

The flow channels, although optimized for uniform distribution of the extrusion material, are known to cause non-uniformity in the extrudate that leaves the extruder head.
In particular, due to asymmetries in the flow channels, the parts of the flow channels that are most distal in the supply direction, will typically receive considerably less extrusion material, resulting in uneven flow rates, non-uniform thickness and / or density across the width of the extrudate.

Method used

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  • Extruder system for extruding cord reinforced extrudate
  • Extruder system for extruding cord reinforced extrudate
  • Extruder system for extruding cord reinforced extrudate

Examples

Experimental program
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Effect test

first embodiment

[0045]FIGS. 1 and 2 show an extruder system 1 according to the invention. The extruder system 1 is arranged for extruding an extrudate 9, in particular a tire component, that has been reinforced with cords 8, typically steel or textile cords. Examples of cord reinforced tire components are breaker plies, body plies, cap strips and chafers.

[0046]The extruder system 1 comprises an extruder head 2 with a die 3 for extruding the extrudate 9 and a cord guide 4 for guiding the cords 8 into the die 3 so that the cords 8 in use are embedded into the extrudate 9. The extruder system 1 further comprises a material supply or material source 5 for supplying liquefied extrusion material 90, e.g. a viscous rubber compound 91, 92, to the extruder head 2. The material source 5 is located external to or outside of the extruder head 2. In this exemplary embodiment, the extruder system 1 is further provided with a pump section 6 between the extruder head 2 and the material source 5 for evenly or unifo...

second embodiment

[0063]FIG. 3 shows an alternative extruder system 101 according to the invention, comprising an alternative extruder head 102. The alternative extruder head 102 differs from the extruder head 2 as shown in FIG. 2 in that it is provided with an alternative first flow channel 171 and an alternative second flow channel 172 that connect to the material source 105 via the top surface 124 and the bottom surface 125, respectively.

third embodiment

[0064]FIG. 4 shows a further alternative extruder system 201 according to the invention, comprising a further alternative extruder head 202 and an alternative configuration of the material source 205 and the pump section 206. The alternative extruder head 202 differs from the extruder head 2 as shown in FIG. 2 in that it is provided with an alternative first flow channel 271 and an alternative second flow channel 272 that connect to the material source 205 via a corner of the top surface 224 and the rear surface 223 and via a corner of the bottom surface 225 and the rear surface 223, respectively. The first extruder 251 and the second extruder 252, as well as the first gear pump 261 and the second gear pump 262, respectively, are placed at an inclination with respect to the cord plane B to improve the alignment of the output directions G1, G2 of the respective gear pumps 261, 262 with respect to the inflow directions F1, F2 of the respective flow channels 271, 272.

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Abstract

The invention relates to an extruder system and a method for extruding cord reinforced extrudate, wherein the extruder system comprises an extruder head with a die for receiving extrusion material and a cord guide for guiding cords in a common cord plane in a cord direction into the die, wherein the extruder system comprises a first extruder and a second extruder, wherein the extruder head comprises a first flow channel and a second flow channel, wherein the extruder system further comprises a first pump and a second pump for receiving the extrusion material from the first extruder and the second extruder and for directing said extrusion material into the first flow channel and the second flow channel.

Description

CROSS REFERENCE TO RELATED APPLICATION[0001]This application is a divisional of co-pending U.S. patent application Ser. No. 15 / 566,149, filed Oct. 12, 2017, the contents of which is incorporated herein.BACKGROUND[0002]The invention relates to an extruder system and a method for extruding cord reinforced extrudate, in particular cord reinforced tire components.[0003]Known extruder systems for extruding cord reinforced tire components comprise so-called ‘cross head’ type extruder heads in which the extrusion material is supplied laterally with respect to the direction in which the cords are fed into the extruder head. EP 1 145 835 A2 discloses such an exemplary extruder system. The known extruder heads are provided with flow channels that deflect the flow of extrusion material from the lateral supply direction towards the cord direction. The flow channels, although optimized for uniform distribution of the extrusion material, are known to cause non-uniformity in the extrudate that lea...

Claims

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Application Information

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Patent Type & AuthorityApplications(United States)
IPC IPC(8): B29C48/07B29C48/49B29C48/21B29C48/34B29C48/37B29C48/154B29C48/156B29C48/285B29D30/38B33Y30/00
CPCB29C48/07B29K2021/00B29D2030/381B29D30/38B29C48/37B29C48/2883B29C48/156B33Y30/00B29L2030/002B29C48/154B29C48/49B29C48/21B29C48/34B29C48/08B29C48/307B29C48/022B29C48/285B29L2030/008B29C48/92B29C2948/926B29C2948/92876B29C64/106B29C48/30
InventorDE BRUIJN, RONALD GERARDUS MARIADE JONG, EMIEL HENDRICUSMEIJERS, PIETER CORNELIS
OwnerVMI HOLLAND BV