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EP2882578B1 - Ensemble filtre et procédé d'assemblage dudit ensemble filtre - Google Patents

Ensemble filtre et procédé d'assemblage dudit ensemble filtre Download PDF

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Publication number
EP2882578B1
EP2882578B1 EP13762200.7A EP13762200A EP2882578B1 EP 2882578 B1 EP2882578 B1 EP 2882578B1 EP 13762200 A EP13762200 A EP 13762200A EP 2882578 B1 EP2882578 B1 EP 2882578B1
Authority
EP
European Patent Office
Prior art keywords
filter
carrier
frame
border
raised
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.)
Active
Application number
EP13762200.7A
Other languages
German (de)
English (en)
Other versions
EP2882578A1 (fr
Inventor
Terence Butlin
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.)
Eco Filters Ltd
Original Assignee
Eco Filters Ltd
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
Priority claimed from GB1214241.0A external-priority patent/GB2504751B/en
Application filed by Eco Filters Ltd filed Critical Eco Filters Ltd
Publication of EP2882578A1 publication Critical patent/EP2882578A1/fr
Application granted granted Critical
Publication of EP2882578B1 publication Critical patent/EP2882578B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B3/00—Producing shaped articles from the material by using presses; Presses specially adapted therefor
    • B28B3/02—Producing shaped articles from the material by using presses; Presses specially adapted therefor wherein a ram exerts pressure on the material in a moulding space; Ram heads of special form
    • B28B3/021—Ram heads of special form
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B7/00—Moulds; Cores; Mandrels
    • B28B7/36—Linings or coatings, e.g. removable, absorbent linings, permanent anti-stick coatings; Linings becoming a non-permanent layer of the moulded article
    • B28B7/368—Absorbent linings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B7/00—Moulds; Cores; Mandrels
    • B28B7/40—Moulds; Cores; Mandrels characterised by means for modifying the properties of the moulding material
    • B28B7/46—Moulds; Cores; Mandrels characterised by means for modifying the properties of the moulding material for humidifying or dehumidifying

Definitions

  • the present invention relates to a filter assembly for use in a cementitious press mould such as a wet concrete, hermetic or semi-dry mix press mould, and to a method for assembling a filter assembly.
  • a known cementitious press mould comprises a mould cavity having a closed base and side walls. A metered amount of cementitious mix is placed into the mould cavity and a movable press head is then moved towards the closed base to apply a high compressive pressure on to the cementitious mix.
  • the press head comprises a die head having a head plate that comes into contact with the mixture contained in the mould.
  • the head plate is of a shape and size that corresponds to the cross-sectional shape and size of the mould cavity.
  • the base of the press mould comprises a bottom former that has a shape and size that corresponds to the cross-sectional shape and size of the mould cavity.
  • a wet concrete mix is compacted, it is shaped to the shape of the mould, and excess water is squeezed out of the wet mixture.
  • a result of these actions is the formation of a moulded product, such as a paving slab or kerb, for example.
  • a cementitious mix designed specifically for the press mould is placed in the mould cavity.
  • the cementitious mix usually consists of a face and back mix.
  • the face mix normally comprises expensive aggregates with a high cement content and is generally very wet when discharged into the mould.
  • the back mix is a weak semi-dry cement mix, and is placed on top of the face mix within the cavity.
  • a hermetic press mould comprises a sealed base, cement enriched water from the face mix is forced thorough the back mix when under pressure from the press head.
  • a semi dry mix having a higher cement content, and slightly wetter consistency than the back mix of a hermetic press mould is placed in the mould cavity.
  • the water/cement ratio of the mix is such that on compaction from either pressure or vibration, the mix forms a solid mass to the required strength.
  • Some filters for example made of paper, are loosely retained in the mould so as to be removed with the moulded product. This is wasteful of filter material and also has the further disadvantage of requiring removal of the filter material from the moulded product.
  • Some filters are fixed to the head plate and/or to the lower former of the mould so as to remain in the mould / on the die head after the moulding process and removal of the product.
  • Such filters may be formed from any convenient material, or fabric, that allows liquid to pass through the filter whilst preventing particulate material from passing through.
  • a suitable filter fabric which may be knitted or woven is described in our UK Patent No. GB 2 277 536B .
  • other materials such as plastics materials, may also be used.
  • any permeable, woven, non-woven (such as needle felts), knitted or foam material may be used as a suitable filter fabric.
  • the filter fabric is mounted on a support layer which is generally formed from a plastics material to form a filter assembly.
  • the filter assembly must be attached to the carrier plate.
  • the support layer may be formed with perforations and these perforations may be aligned with the perforations in the carrier plate in order to allow proper drainage of the cementitious mix.
  • a problem with such known filter assemblies is that it is generally necessary for a customer to attach the filter assembly to the carrier plate. This is achieved by means of an adhesive layer formed around the edge of the filter. In use, a customer removes a backing sheet from the adhesive layer and then positions the filter onto the carrier plate.
  • the filter assembly If the filter assembly is misaligned, then the filter assembly will wear more quickly during use of the press mould, and drainage may be impaired. Further, it can be time consuming to have to attach the filter assembly to the carrier plate.
  • EP 0 629 477 A1 discloses a filter arrangement for a machine for manufacturing concrete slabs, wherein attachment means are provided to detachably secure the filter arrangement on the side of a pressure plate.
  • a filter assembly for a cementitious press mould with the features of claim 1.
  • the filter sheet is attached to the filter frame, and the filter is engageable directly with the die plate. This means that, in use, the filter sheet is held in place directly over the first carrier portion in which perforations are formed, without needing to support the filter with a support plate.
  • the filter will form a face for contacting and applying compression to a mixture contained in the press mould.
  • the filter sheet and filter frame may be manufactured to appropriate dimensions to fit a particular carrier plate.
  • the filter sheet may then be attached to the filter frame by any suitable means. These steps may be carried out at any suitable location, and not necessarily in the vicinity of the press mould to which the filter is to be fitted.
  • the filter sheet may be attached to the filter frame by stitching the filter sheet to the filter frame.
  • the filter sheet may be adhesively attached to the filter frame.
  • the filter frame may be made from any suitable material, such as a plastics material.
  • the filter frame may be formed from polypropylene, fibreglass, carbon fibre, metal or wood, for example.
  • the filter frame may be formed from a single piece of material. Alternatively it may be formed from a plurality of frame sections each of which frame sections is engageable with one or more other frame sections to form the filter frame.
  • the filter is engageable with the die plate, such that when the filter is placed on the die plate, the filter and the carrier plate engage with one another to hold the filter in place on the carrier plate.
  • the die plate comprises a carrier engagement portion, and the filter comprises a corresponding filter engagement portion engageable with the carrier engagement portion.
  • the die plate comprises a plurality of carrier engagement portions each comprising a protrusion, and the filter comprises a plurality of filter engagement portions each shaped to engage with a corresponding protrusion.
  • the carrier border comprises a plurality of raised corner portions, and the filter frame is shaped to fit within the raised corners of the carrier border.
  • the raised corner portions of the carrier border may be detachable in order that they may be replaced. This means that if the corner portions wear down they may be replaced by new corner portions without having to replace the carrier plate entirely. This can be advantageous, since the corners of the die plate tend to wear more quickly than the remainder of the die plate.
  • the carrier border may comprise a raised corner portion at each corner of the carrier border, although in some embodiments, there may be a raised corner portion at some, but not all corners of the carrier border.
  • the corners of the filter frame that correspond to the raised corner portions of the carrier border are shaped to abut against the corresponding raised corner portion of the carrier border when the filter is positioned on the die plate.
  • the carrier border may be defined only by raised corner portions.
  • the filter frame may be formed from a single piece of material. Alternatively it may be formed from a plurality of frame sections each of which frame sections is engageable with one or more other frame sections to form the filter frame.
  • the filter is engageable with the die plate, such that when the filter is placed on the die plate, the filter and the carrier plate engage with one another to hold the filter in place on the carrier plate.
  • the carrier border comprises a plurality of raised corner portions, and the filter frame is shaped to fit within the raised corners of the carrier border.
  • the raised corner portions of the carrier border may be detachable in order that they may be replaced. This means that if the corner portions wear down they may be replaced by new corner portions without having to replace the carrier plate entirely. This can be advantageous, since the corners of the die plate tend to wear more quickly than the remainder of the die plate.
  • the carrier border may comprise a raised corner portion at each corner of the carrier border, although in some embodiments, there may be a raised corner portion at some, but not all corners of the carrier border.
  • the corners of the filter frame that correspond to the raised corner portions of the carrier border are shaped to abut against the corresponding raised corner portion of the carrier border when the filter is positioned on the die plate.
  • the carrier border may be defined only by raised corner portions.
  • the filter is positioned on the die plate such that the filter frame is located within the at least one channel.
  • the carrier engagement portion comprises the raised first carrier portion or die insert, together with the one or more carrier engagement portions.
  • protrusions may be formed on the sides of the carrier border or die plate, for example.
  • the filter will be correspondingly shaped so that the filter and the carrier engage with one another when the filter is placed on the carrier plate.
  • the filter frame may, for example, comprise recesses formed on the frame to engage with protrusions on the carrier border.
  • the carrier engagement portions may comprise recesses, and the corresponding filter engagement portions are shaped to engage with the recesses.
  • the die plate and filter may have any convenient shape, and may be, for example, substantially square or rectangular. Other shapes are also possible.
  • a press mould 2 for making concrete slabs and incorporating filter assemblies in accordance with embodiments of the invention is shown.
  • the mould 2 comprises a mould cavity having a bottom former 4 defining a closed base to the mould cavity, and a moveable press head 6.
  • the press head 6 includes a die plate 8 having a die face.
  • the press head 6 is connected to a ram (not shown) which enables the die face to be moveable toward the bottom former 4 for compressing cementitious material 12 therebetween for forming a concrete slab or kerb or other product.
  • a first filter 20 is placed between the cementitious material 12 and the die plate 8. This first filter 20 is described in more detail below with reference to Figures 3 and 4 .
  • the first filter 20 overlays a surface of the die plate 8 in order to provide a release for removal of the moulded product from the mould and also to assist in preventing particulate material from exiting the mould via the die plate 8.
  • the first filter 20 forms part of a filter assembly 22 which comprises a die plate 8, and first filter 20.
  • the die plate 8 comprises a first carrier portion 26 and a carrier border 28 surrounding the first carrier portion 26.
  • the first carrier portion 26 is raised relative to the carrier border 28.
  • the first carrier portion comprises a plurality of perforations 30 which allow liquid to pass through and out of the press mould.
  • the border does not have any perforations, although in some embodiments it could.
  • the first filter 20 comprises a filter sheet 32 mounted on a filter frame 34.
  • the filter sheet 32 may be formed from any suitable material such as a knitted or woven material that 25 allows liquid to pass through, but prevents passage of particulate material.
  • the filter frame is made from any suitable material such as a plastics material.
  • the filter sheet 32 is attached to the filter frame 34 by any suitable means, and in this embodiment it is stitched to the frame 34, as shown in more detail in Figure 3 .
  • the carrier border 28 comprises a plurality of carrier engagement portions each comprising a raised corner portion 36.
  • the filter frame 34 comprises a plurality of corresponding engagement portions 38 (only three of which are shown) which each abut with a respective raised corner portion 36 when the filter is placed on the die plate 8.
  • the corresponding engagement portions (38) are in the form of shaped corner portions having an outer substantially flat surface 40 rather than an apex and an inner substantially flat surface 41.
  • the surface 40 will abut with a corresponding corner portion 36.
  • a channel 37 is defined between each of the corner portions 36 and the first carrier portion 26. This means that when the filter 20 is in position, the filter frame fits between the raised corner portions 36 and the first carrier portion 26 within the channel 37 and hence is held in position.
  • corner portions of the filter frame 34 defined by surfaces 40, 41 are located within the channels 37.
  • filter frame shown in the embodiments illustrated in Figures 1 to 4 has been shown being formed from a single piece of material, it is also possible to form the filter frame from frame sections as shown in Figures 5 and 6 .
  • a filter frame 88 not forming part of the invention comprises four frame sections 82 which connect together by any suitable means.
  • the frame 82 connect to one another by means of an engagement portion 84 formed at one end of a first frame section, which is engagable with a corresponding engagement recess 86 formed at one end of a second filter section.
  • Each frame section 82 comprises a first end at which is formed an engaging portion 84, and a second end at which is formed an engagement recess 86. Different arrangements may also be used.
  • the frame 88 could be formed from a different number of frame sections, and also the frame sections may be connected to one another by any convenient means.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Press-Shaping Or Shaping Using Conveyers (AREA)
  • Sink And Installation For Waste Water (AREA)
  • Moulds, Cores, Or Mandrels (AREA)

Claims (5)

  1. Ensemble filtre (22) pour un moule de presse de ciment, l'ensemble de filtre comprenant :
    une plaque de matrice (8) comprenant une première partie de support (26) comprenant une pluralité de perforations (30), et un bord de support (28) entourant la première partie de support (26), la première partie de support (26) étant surélevée par rapport au bord de support (28) ; et
    un filtre (20) comprenant une feuille filtrante (32) montée sur un cadre de filtre (34), caractérisé en ce que :
    la plaque de matrice (8) comprend une pluralité de parties de mise en prise de support comprenant chacune une partie de coin surélevée (36) du bord de support (28), un canal (37) est défini entre la première partie de support (26) et chacune des parties de coin surélevées (36) ;
    le cadre de filtre (34) est formé pour s'ajuster entre les parties de coin surélevées (36) et la première partie de support (26) à l'intérieur du canal (37) ;
    les parties de coin surélevées (36) sont espacées les unes des autres ; et
    le cadre de filtre (34) comprend une pluralité de parties de mise en prise correspondantes (38), chacune desdites des parties de mise en prise correspondantes est adaptée pour venir en butée contre une partie de coin surélevée respective (36) lorsque le filtre est placé sur la plaque de matrice (8), les parties de mise en prise correspondantes (38) se présentant sous la forme de parties de coin présentant une surface externe sensiblement plate (40) et une surface interne sensiblement plate (41).
  2. Ensemble filtre (22) selon la revendication 1, dans lequel la feuille filtrante (32) est cousue sur le cadre de filtre (34).
  3. Ensemble filtre (22) selon la revendication 1 ou la revendication 2, dans lequel la feuille filtrante (32) est fixée de manière adhésive au cadre de filtre (34).
  4. Ensemble filtre (22) selon la revendication 1 ou la revendication 2, dans lequel le cadre de filtre (34) est formé à partir d'une matière plastique.
  5. Procédé d'assemblage d'un ensemble de filtre (22), pour un moule de ciment, l'ensemble de filtre comprenant :
    une plaque de matrice (8) comprenant une première partie de support (26) comprenant une pluralité de perforations (30), et un bord de support (28) entourant la première partie de support (26) ; et
    un filtre (20) comprenant une feuille filtrante (32) montée sur un cadre de filtre (34), la première partie de support (26) étant surélevée par rapport au bord de support (28), caractérisé en ce que le cadre de filtre (34) comprenant une pluralité de parties de mise en prise correspondantes (38), le procédé comprenant les étapes de formation d'une pluralité de parties de mise en prise de support sur la plaque de matrice (8), chaque partie de mise en prise de support comprenant une partie de coin surélevée (36) du bord de support, les parties de coin surélevées étant espacées les unes des autres ;
    la définition d'un canal (37) entre la première partie de support (26) et chacune des parties de coin surélevées (36) ;
    la formation d'un cadre de filtre (34) formé pour s'adapter entre les parties de coin surélevées (36) et la première partie de support (26) et à l'intérieur du canal (37) ; et
    le montage de la feuille filtrante (32) sur le cadre de filtre (34) de sorte que chacune de la pluralité de parties de mise en prise correspondantes (38) vient en butée contre une partie de coin surélevée respective (36) lorsque le filtre est placé sur la plaque de matrice (8), les parties de mise en prise correspondantes (38) se présentant sous la forme de parties de coin ayant une surface externe sensiblement plate (40) et une surface interne sensiblement plate (41).
EP13762200.7A 2012-08-09 2013-08-05 Ensemble filtre et procédé d'assemblage dudit ensemble filtre Active EP2882578B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB1214241.0A GB2504751B (en) 2012-08-09 2012-08-09 Filter assembly
GB1311932.6A GB2504848B (en) 2012-08-09 2013-07-03 Filter assembly
PCT/GB2013/052089 WO2014023945A1 (fr) 2012-08-09 2013-08-05 Ensemble filtre et procédé d'assemblage dudit ensemble filtre

Publications (2)

Publication Number Publication Date
EP2882578A1 EP2882578A1 (fr) 2015-06-17
EP2882578B1 true EP2882578B1 (fr) 2019-09-25

Family

ID=49165776

Family Applications (2)

Application Number Title Priority Date Filing Date
EP13762200.7A Active EP2882578B1 (fr) 2012-08-09 2013-08-05 Ensemble filtre et procédé d'assemblage dudit ensemble filtre
EP13762201.5A Active EP2882510B1 (fr) 2012-08-09 2013-08-05 Ensemble porteur

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP13762201.5A Active EP2882510B1 (fr) 2012-08-09 2013-08-05 Ensemble porteur

Country Status (3)

Country Link
EP (2) EP2882578B1 (fr)
GB (2) GB2504848B (fr)
WO (2) WO2014023945A1 (fr)

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB411049A (en) * 1933-12-13 1934-05-31 John Millar Wilson Improvements in the manufacture of concrete slabs and the like
US2638655A (en) * 1950-09-22 1953-05-19 Thermo Fluid Corp Method of producing cementitious bodies
GB687968A (en) * 1951-09-07 1953-02-25 Cruickshank Ltd R Filter cloths
DE2159890C3 (de) * 1970-12-04 1980-07-03 Enrico Florenz Longinotti (Italien) Form zum Rütteln und Pressen von Formungen aus Beton o.dgl., insbesondere von Betonplatten, und ein mit mehreren derartigen Formen durchführbares Verfahren
US3980414A (en) * 1975-09-29 1976-09-14 Owens-Corning Fiberglas Corporation Core and pressing head of mold box assembly
GB2100659A (en) * 1981-06-19 1983-01-06 Graham David Lyson Moulds for concrete or plaster
GB2128129B (en) * 1982-08-20 1986-04-23 John Richard Blake Production of roofing tiles
GB8412651D0 (en) * 1984-05-17 1984-06-20 Paterson Precast Ltd Robert Pressed concrete product
SE501352C2 (sv) * 1993-06-18 1995-01-23 Machinator Ab Filteranordning
IT1294828B1 (it) * 1997-07-24 1999-04-15 Longinotti Meccanica S R L Apparecchiatura per produrre mattonelle sottili di impasto cementizio
GB2365368B (en) * 2000-08-02 2003-06-18 Eco Filters Ltd Filter assembly
ES2253992B1 (es) * 2004-07-15 2007-10-01 Prensas De Tomelloso, S.A. Punzon de prensada con sistema de extraccion de agua para la fabricacion de baldosas.
GB0512470D0 (en) * 2005-06-18 2005-07-27 Eco Filters Ltd Filter assembly
ITMI20061262A1 (it) * 2006-06-29 2007-12-30 O C E M Officina Costruzioni Elettro-Meccaniche Dispositivo per la produzione di mattonelle
GB0625072D0 (en) * 2006-12-15 2007-01-24 Eco Filters Ltd Wear component

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
EP2882510A1 (fr) 2015-06-17
GB2506011B (en) 2016-04-13
GB201313470D0 (en) 2013-09-11
WO2014023946A1 (fr) 2014-02-13
GB2504848B (en) 2015-12-30
GB2506011A (en) 2014-03-19
WO2014023945A1 (fr) 2014-02-13
GB2504848A (en) 2014-02-12
EP2882578A1 (fr) 2015-06-17
GB201311932D0 (en) 2013-08-14
EP2882510B1 (fr) 2019-06-05

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