# US 8,770,232 B2 · Method for manufacturing climate control duct, and climate control duct

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- Number: US 8,770,232 B2
- Document ID: US8770232B2
- Status: Granted
- Kind: B2
- Application number: 12/893,782
- Filed: 2010-09-29
- Published: 2011-03-31
- Granted: 2014-07-08
- Earliest claimed: 2009-09-30
- Assignees: Kyoraku Co., Ltd.
- Applicants: Masaaki Onodera; Yoshitaka Matsubara; Naoto Tani; Kazuo Waki
- Inventors: Masaaki Onodera; Yoshitaka Matsubara; Naoto Tani; Kazuo Waki
- Web page: https://patentgrep.com/patent/US8770232B2

## CPC

- B29D 23/001: {Pipes; Pipe joints (pleated hoses B29D23/18)}
- B29C 33/424: {Moulding surfaces provided with means for marking or patterning (for injection moulding B29C45/372)}
- B29C 44/507: {extruding the compound through an annular die (in general B29C48/03)}
- B29C 44/5627: {by mechanical deformation, e.g. crushing, embossing, stretching}
- B29C 48/10: flexible, e.g. blown foils
- B29C 48/92: Measuring, controlling or regulating
- B29C 49/52: having decorating or printing means
- B29C 49/62: Venting means
- B60H 1/00564: {of air ducts}
- F16L 9/006: {specially profiled (F16L9/003 takes precedence)}
- F24F 13/0245: {Manufacturing or assembly of air ducts; Methods therefor}
- B29C 2049/4882: {Mould cavity geometry}
- B29C 2948/92133: Width or height
- B29C 2948/92152: Thickness
- B29K 2023/12: {PP, i.e. polypropylene}
- B29K 2105/04: cellular or porous
- B29D: PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE (making granules B29B9/00; making preforms B29B11/00)
- B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00)
- B60H: ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- F16L: PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F24F: AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING (removing dirt or fumes from areas where they are produced B08B15/00; vertical ducts for carrying away waste gases from buildings E04F17/02; tops for chimneys or ventilating shafts, terminals for flues F23L17/02)
- B29K: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR {MOULDS, } REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS

## Abstract

The invention provides a method for manufacturing a climate control duct, the method capable of improving a characteristic of transferring a shape of a protrusion onto a surface of a duct and capable of preventing reduction in ventilation efficiency. In order to manufacture a climate control duct having a protrusion formed on an outer peripheral surface thereof, the method includes subjecting an extruded foamed resin to blow molding by use of a duct-shaped mold in which a groove for transfer of a shape of the protrusion is formed on at least part of a surface thereof. Herein, the following relations are satisfied: 0.5 mm<D<5 mm, D<W<4×D, and W<2×T, in which W represents a width of the groove, D represents a depth of the groove, and T represents a thickness of the foamed resin.

## Claims

### Claim 1

A climate control duct obtained by molding a foamed resin while fitting the foamed resin to a shape of a mold by use of a pressurized fluid,
the duct comprising a protrusion formed on an outer peripheral surface thereof, wherein
the following relations are satisfied:
0.5 mm<Ha<5 mm,
2×Ha<Wa<5×Ha,
Wa<3×Ta, and
Da/Ha<0.7, in which
Wa represents a width of the protrusion, Ha represents a height of the protrusion, Ta represents a thickness of a wall at a portion where the protrusion is not formed, and Da represents a depth of a groove to be formed on an inner circumferential surface in correspondence with the protrusion.

### Claim 2 (depends on 1)

The climate control duct according to claim 1, wherein
the protrusion has a rise angle of not less than 45°.