EP2090688A1 - Drum with housing having a monolithic structure - Google Patents

Drum with housing having a monolithic structure Download PDF

Info

Publication number
EP2090688A1
EP2090688A1 EP08425094A EP08425094A EP2090688A1 EP 2090688 A1 EP2090688 A1 EP 2090688A1 EP 08425094 A EP08425094 A EP 08425094A EP 08425094 A EP08425094 A EP 08425094A EP 2090688 A1 EP2090688 A1 EP 2090688A1
Authority
EP
European Patent Office
Prior art keywords
housing
drum
monolithic structure
drum according
monolithic
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP08425094A
Other languages
German (de)
French (fr)
Inventor
Giacomo Vallero
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Vallero International SpA
Original Assignee
Vallero International SpA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Vallero International SpA filed Critical Vallero International SpA
Priority to EP08425094A priority Critical patent/EP2090688A1/en
Publication of EP2090688A1 publication Critical patent/EP2090688A1/en
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06B—TREATING TEXTILE MATERIALS USING LIQUIDS, GASES OR VAPOURS
    • D06B23/00—Component parts, details, or accessories of apparatus or machines, specially adapted for the treating of textile materials, not restricted to a particular kind of apparatus, provided for in groups D06B1/00 - D06B21/00
    • D06B23/04—Carriers or supports for textile materials to be treated
    • C—CHEMISTRY; METALLURGY
    • C14—SKINS; HIDES; PELTS; LEATHER
    • C14B—MECHANICAL TREATMENT OR PROCESSING OF SKINS, HIDES OR LEATHER IN GENERAL; PELT-SHEARING MACHINES; INTESTINE-SPLITTING MACHINES
    • C14B3/00—Milling leather
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F37/00—Details specific to washing machines covered by groups D06F21/00 - D06F25/00
    • D06F37/26—Casings; Tubs

Definitions

  • the present invention relates to a drum for tanning, dyeing and/or treating hides and/or fabrics.
  • this drum comprises a plastic housing of generally cylindrical shape consisting of a side wall closed at each end by an end wall so as to define an internal cavity.
  • the side wall of such a drum is made by first rolling and then welding a sheet of homopolymeric polypropylene.
  • the subject of the present invention is a drum of the type indicated at the beginning of this description and characterized in that the abovementioned housing is of a monolithic structure.
  • the expression "monolithic structure” should be understood to mean a single structure that forms a substantial part of the end and side walls, without ruling out the possibility that one or more openings be made in these walls and provided with closing doors, and that the structure be fitted with other components, suitable for example for transmitting the rotational motion to the housing or improving the mixing of the material treated inside the drum.
  • the drum of the invention has no welds and therefore has a longer useful life than conventional drums, since it is not subject to failure under heat and fatigue stress.
  • the range of choice of materials from which it can be made is not limited by the requirement that they be weldable.
  • polyethylene LLDPE, HDPE, crosslinked PE
  • polypropylene and polyamide optionally reinforced with fibres and/or fillers and in general all thermoplastics that are resistant to chemical attack and abrasion and that have a low coefficient of friction.
  • the drum of the invention is lighter and has a larger loading capacity than conventional drums.
  • the monolithic structure of the housing of the drum of the invention is advantageously made by using the technique of rotation moulding, which is well known per se and can be carried out using machinery which is in wide use.
  • the cost of producing the drum of the invention is thus found to be less than that of conventional drums.
  • a drum for tanning, dyeing and/or treating hides and/or fabrics comprises a plastic housing 10 of generally cylindrical form consisting of a side wall 12 closed at each end by a circular end wall 14 so as to define an internal cavity.
  • the drum is also provided in a manner known per se and not shown in the figure with drive means for turning it about the housing's central longitudinal axis 16.
  • the housing is of a monolithic structure advantageously obtained by rotational moulding, which is a technique of producing in one piece, without the need for welding, hollow bodies that have no internal stresses and that have good uniformity of thickness.
  • this technique involves introducing a predefined quantity of resin into a desired mould consisting of a number of parts able to be joined hermetically together.
  • the mould is then closed, rotated with a composite motion in at least two orthogonal planes, and heated, by for example blowing in hot air or placing it in an oven.
  • the resin thus begins to melt, and is thrown against the walls of the mould by centrifugal force, where it clings in a layer of the desired thickness, which may vary from region to region.
  • the mould is cooled down and opened, allowing the finished product to be extracted.
  • an opening 18 is formed in the monolithic structure and will be provided with a closing door (not shown) to allow access to the internal cavity.
  • the drum may also include any type of internal member, such as blades, agitators and the like.
  • the drum may be of a fixed type rather than being mounted rotatably about its central longitudinal axis.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Moulding By Coating Moulds (AREA)
  • Treatment Of Fiber Materials (AREA)

Abstract

The drum for tanning, dyeing and/or treating hides and/or fabrics, comprises a housing (10) of generally cylindrical shape consisting of a side wall (12) closed at each end by an end wall (14) so as to define an internal cavity. The housing (10) is made of plastic and is of a monolithic structure.

Description

  • The present invention relates to a drum for tanning, dyeing and/or treating hides and/or fabrics.
  • In more detail, this drum comprises a plastic housing of generally cylindrical shape consisting of a side wall closed at each end by an end wall so as to define an internal cavity.
  • In one prior art form, the side wall of such a drum is made by first rolling and then welding a sheet of homopolymeric polypropylene.
  • However, these welds represent weak points in the structure, being susceptible to failure following heat stress and fatigue stress. Moreover, only a limited number of plastic materials can be welded, which greatly limits the available range of component materials.
  • In order to overcome these problems, the subject of the present invention is a drum of the type indicated at the beginning of this description and characterized in that the abovementioned housing is of a monolithic structure.
  • For the purposes of the present description, the expression "monolithic structure" should be understood to mean a single structure that forms a substantial part of the end and side walls, without ruling out the possibility that one or more openings be made in these walls and provided with closing doors, and that the structure be fitted with other components, suitable for example for transmitting the rotational motion to the housing or improving the mixing of the material treated inside the drum.
  • The drum of the invention has no welds and therefore has a longer useful life than conventional drums, since it is not subject to failure under heat and fatigue stress. What is more, the range of choice of materials from which it can be made is not limited by the requirement that they be weldable. For example, it is possible to use various types of polyethylene (LLDPE, HDPE, crosslinked PE), polypropylene and polyamide, optionally reinforced with fibres and/or fillers and in general all thermoplastics that are resistant to chemical attack and abrasion and that have a low coefficient of friction.
  • It should also be observed that, for the same mechanical strength, the drum of the invention is lighter and has a larger loading capacity than conventional drums.
  • The monolithic structure of the housing of the drum of the invention is advantageously made by using the technique of rotation moulding, which is well known per se and can be carried out using machinery which is in wide use. The cost of producing the drum of the invention is thus found to be less than that of conventional drums.
  • The use of the rotational moulding technique also makes it possible, if desired, to give the drum housing different thicknesses in different places as a means of optimizing its structure with reference to the required performance and the fitting of inserts and the like.
  • Other advantages and features of the present invention will become clear in the course of the following detailed description, which is given by way of non-limiting example, with reference to the single accompanying figure, which is a diagrammatic perspective view of a housing of a drum of the invention.
  • A drum for tanning, dyeing and/or treating hides and/or fabrics comprises a plastic housing 10 of generally cylindrical form consisting of a side wall 12 closed at each end by a circular end wall 14 so as to define an internal cavity. The drum is also provided in a manner known per se and not shown in the figure with drive means for turning it about the housing's central longitudinal axis 16.
  • The housing is of a monolithic structure advantageously obtained by rotational moulding, which is a technique of producing in one piece, without the need for welding, hollow bodies that have no internal stresses and that have good uniformity of thickness.
  • As is known, this technique involves introducing a predefined quantity of resin into a desired mould consisting of a number of parts able to be joined hermetically together. The mould is then closed, rotated with a composite motion in at least two orthogonal planes, and heated, by for example blowing in hot air or placing it in an oven. The resin thus begins to melt, and is thrown against the walls of the mould by centrifugal force, where it clings in a layer of the desired thickness, which may vary from region to region. After a certain period of time, the mould is cooled down and opened, allowing the finished product to be extracted.
  • As illustrated in the single figure, an opening 18 is formed in the monolithic structure and will be provided with a closing door (not shown) to allow access to the internal cavity. The drum may also include any type of internal member, such as blades, agitators and the like.
  • Naturally, without altering the principle of the invention, the details of construction and forms of embodiment may depart considerably from those described purely by way of example, without thereby departing from the scope of the claims. For example, the drum may be of a fixed type rather than being mounted rotatably about its central longitudinal axis.

Claims (4)

  1. Drum for tanning, dyeing and/or treating hides and/or fabrics, comprising a plastic housing (10) of generally cylindrical shape consisting of a side wall (12) closed at each end by an end wall (14) so as to define an internal cavity,
    said drum being characterized in that said housing (10) is of a monolithic structure.
  2. Drum according to Claim 1, in which said monolithic housing (10) is made by rotational moulding.
  3. Drum according to Claim 1 or 2, in which said housing (10) is of a material selected from the group consisting of polyethylene, polypropylene and polyamide, optionally reinforced with fibres and/or fillers.
  4. Drum according to any one of the preceding claims, in which the thickness of said housing (10) varies in different places.
EP08425094A 2008-02-15 2008-02-15 Drum with housing having a monolithic structure Withdrawn EP2090688A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP08425094A EP2090688A1 (en) 2008-02-15 2008-02-15 Drum with housing having a monolithic structure

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP08425094A EP2090688A1 (en) 2008-02-15 2008-02-15 Drum with housing having a monolithic structure

Publications (1)

Publication Number Publication Date
EP2090688A1 true EP2090688A1 (en) 2009-08-19

Family

ID=39620140

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08425094A Withdrawn EP2090688A1 (en) 2008-02-15 2008-02-15 Drum with housing having a monolithic structure

Country Status (1)

Country Link
EP (1) EP2090688A1 (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4423607A (en) * 1980-07-03 1984-01-03 Industrie Zanussi S.P.A. Wash tub of plastics material for clothes washing machines
EP0472840A2 (en) * 1990-08-31 1992-03-04 Zanussi Elettrodomestici S.p.A. Method for making plastic drums for laundry washers and a drum thus made
US20050028568A1 (en) * 2003-08-06 2005-02-10 Boris Koch Externally supported lye tank
DE202007003085U1 (en) * 2007-03-02 2007-05-24 BSH Bosch und Siemens Hausgeräte GmbH Plastic moulded outer drum for a horizontal axis front loading washing machine has a horizontal outlet in the lower region directed to the side into which the pressure chamber is fitted
WO2007113228A1 (en) * 2006-03-31 2007-10-11 Arcelik Anonim Sirketi A noise-reduced tub for a washer/dryer

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4423607A (en) * 1980-07-03 1984-01-03 Industrie Zanussi S.P.A. Wash tub of plastics material for clothes washing machines
EP0472840A2 (en) * 1990-08-31 1992-03-04 Zanussi Elettrodomestici S.p.A. Method for making plastic drums for laundry washers and a drum thus made
US20050028568A1 (en) * 2003-08-06 2005-02-10 Boris Koch Externally supported lye tank
WO2007113228A1 (en) * 2006-03-31 2007-10-11 Arcelik Anonim Sirketi A noise-reduced tub for a washer/dryer
DE202007003085U1 (en) * 2007-03-02 2007-05-24 BSH Bosch und Siemens Hausgeräte GmbH Plastic moulded outer drum for a horizontal axis front loading washing machine has a horizontal outlet in the lower region directed to the side into which the pressure chamber is fitted

Similar Documents

Publication Publication Date Title
US10919210B2 (en) Organo-sheet for motor vehicles
KR101567197B1 (en) A linerless pressure vessel by centrifugal forced winding and a method for manufacturing thereof
US10688693B2 (en) Reinforced thermoplastic products and methods of making the same
Mallick Thermoset matrix composites for lightweight automotive structures
RU2587171C2 (en) Method of producing composite material
TWI697398B (en) Manufacturing method of structure
US20130309442A1 (en) Structural Member with Locally Reinforced Portion and Method for Forming Structural Member
CN104786517B (en) The manufacturing method and rack housing of rack housing
CN109649310A (en) Fibre reinforced composites center beam of bumper and extruded member
Trauth Characterisation and modelling of continuous-discontinuous sheet moulding compound composites for structural applications
WO2018088135A1 (en) Molded article, and compression molding method
US6482342B1 (en) Resin transfer molding of centrifuge rotor
CN107206707A (en) The manufacture method for the motor vehicle component that enhancing thermoplastic is made
JP2011509200A (en) Method for producing a (partially) annular and fiber reinforced polymer-containing molding from a semi-finished fiber composite product
US20100233452A1 (en) Sandwich Structure and Method of Producing Same
JP2016169000A (en) Vehicular hybrid side sill, manufacturing method of the same, and vehicle body having the same
EP2090688A1 (en) Drum with housing having a monolithic structure
KR102358826B1 (en) Production of multishell composite-material components with reinforcement structure bonded thereto
US7350660B2 (en) Plastic pressure vessel for a fluid and method of manufacturing such a vessel
RU2446947C2 (en) Method of manufacturing tank for hot water
CN107639844A (en) The manufacture method and relevant apparatus features of the part of appliance of motor vehicles
FR2914874A1 (en) Hollow composite product e.g. tank, manufacturing method, involves blowing interior of thermoplastic parison for plating assembly against mold, where assembly is formed by thermoplastic parison and structure
JP7272466B2 (en) VEHICLE OPENING/CLOSING BODY AND METHOD OF MANUFACTURING VEHICLE OPENING/CLOSING BODY
FI130364B (en) Polyester resin-based fibre reinforced door and method of manufacturing thereof
EP0585618B1 (en) A tubular component made of composite material

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR

AX Request for extension of the european patent

Extension state: AL BA MK RS

AKX Designation fees paid
REG Reference to a national code

Ref country code: DE

Ref legal event code: 8566

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20100220