WO2000001522A1 - Ameliorations apportees aux coussinets de pression - Google Patents

Ameliorations apportees aux coussinets de pression Download PDF

Info

Publication number
WO2000001522A1
WO2000001522A1 PCT/GB1999/002038 GB9902038W WO0001522A1 WO 2000001522 A1 WO2000001522 A1 WO 2000001522A1 GB 9902038 W GB9902038 W GB 9902038W WO 0001522 A1 WO0001522 A1 WO 0001522A1
Authority
WO
WIPO (PCT)
Prior art keywords
press
strips
pad
press pad
silicone
Prior art date
Application number
PCT/GB1999/002038
Other languages
English (en)
Inventor
Melvyn Douglas
Original Assignee
Marathon Belting Limited
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 Marathon Belting Limited filed Critical Marathon Belting Limited
Priority to AU45241/99A priority Critical patent/AU4524199A/en
Priority to CA002333722A priority patent/CA2333722A1/fr
Priority to EP99928122A priority patent/EP1091845A1/fr
Publication of WO2000001522A1 publication Critical patent/WO2000001522A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/06—Platens or press rams
    • B30B15/061—Cushion plates
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K3/00—Apparatus or processes for manufacturing printed circuits
    • H05K3/02—Apparatus or processes for manufacturing printed circuits in which the conductive material is applied to the surface of the insulating support and is thereafter removed from such areas of the surface which are not intended for current conducting or shielding
    • H05K3/022—Processes for manufacturing precursors of printed circuits, i.e. copper-clad substrates

Definitions

  • the present invention relates to a press pad for use in a laminating press for the production of laminate sheets, such as decorative laminates, laminated floorboards, and printed circuit boards, using low pressure and high pressure single daylight and multi daylight presses .
  • a laminate sheet 1 to be pressed between two platens 2 of the press is located between two metal caul plates 3 and two press pads 4.
  • the press pads 4 are each located between one of the caul plates 3 and one of the platens 2.
  • the press pads 4 are usually a little larger than the dimensions of the platen 2 to allow for clamping.
  • the purpose of the press pads 4 is to compensate for density variations in the laminate sheet 1 and thereby ensure that an equal pressure is applied to all parts of the sheet 1.
  • the press pads 4 compensate for any unevenness in the surfaces of the platens 2 of the press itself and any flexure or bowing of the platens 2 when under pressure. Again, this assists in the production of a flat even density laminate.
  • press pad The capacity a press pad has to re-form itself after each pressing is an important characteristic to ensure a reasonable working life and to avoid unnecessary downtime of a press whilst the press pads are replaced.
  • working temperatures for such presses are usually in a range up to 220°C.
  • a press pad In a low pressure, single daylight press such as is typically used in the production of decorative laminates, a press pad must withstand pressures ranging between 25 to 35 kg per cm 2 inclusive at temperatures around 200°C.
  • a press pad In a high pressure, short cycle, single daylight press such as is typically used in the production of laminated floorboards, a press pad must withstand pressures up to 70 kg per cm 2 at similar temperatures up to 200°C as before.
  • a conventional press pad is a densely woven combination of high temperature resistant non-asbestos yarns and metal wire.
  • the metal wire is included to give good heat transmission through the pad to the laminate sheet.
  • the non-metal yarn is required to give the pad the springiness and resilience required to enable the pad to relax after each pressing operation.
  • the relative proportion of the two types of material is a consideration when devising a press pad for a particular purpose. Usually a compromise must be reached between the heat transference and the resilience or springiness required in each case.
  • a conventional press pad is described in EP 0 735 949 Al.
  • This describes a woven fabric of heat resistant strands such as copper wires wherein a substantial proportion of either the warp or the weft comprises a silicone elastomer.
  • the warp or the weft preferably comprises a silicone covered metal wire.
  • such a press pad Prior to use, such a press pad has a weave structure as illustrated in Fig. 8 of the drawings appended hereto, which shows to a scale approximately 10 times life size a cross section of such a press pad 5 wherein weft threads 6 are shown in cross section with warp threads 7 interweaving therebetween.
  • the pad 5 is woven in a twill weave wherein the warp threads 7 pass alternatively under and over two weft threads 6.
  • the warp threads 7 each comprise a stranded metal thread with an overall diameter of around 0.6 mm and the weft threads 6 comprise stranded metal cores 8 covered by a coating of silicone 9 to give an overall diameter of around 1.4 mm.
  • the pad 5 itself has a thickness Tl of around 1.9 mm because the silicone coatings 9 of the weft threads 6 are compressed by the warp threads 7 during weaving .
  • a conventional press pad of this type can be used for very many pressing cycles of a low pressure, single daylight press, as described above, before it wears out and must be replaced.
  • the pad wears out because in use the weave structure is eventually flattened to such an extent that the press pad is unable to relax after each pressing operation and the pad loses its resilience and springiness. It has been found that the cross-section of such a pad 10 appears as shown in Fig. 9 of the drawings appended hereto.
  • the pad 10 initially had a structure identical to that of the pad 5 shown in Fig. 8.
  • the weave structure becomes compressed so that the warp threads 7 bend closely around the weft threads 6 and eventually form rigid bridges 11 over the weft threads 6.
  • the weft threads 6 themselves become considerably distorted so that eventually the silicone coatings 9 between the metal cores 8 and the warp threads 7 is squeezed out and trapped beneath the bridges 11. When this occurs, there is no longer any springiness between the warp and the weft of the pad 10 because the metal cores 6 contact the metal warp threads 7 directly .
  • a press pad for use in a laminate press comprising a woven fabric of heat resistant strands, characterised in that at least one of the warp and the weft comprises metal strips.
  • strips By use of the term “strips” herein and in the claims it is meant that the threads of the weave which comprise the strips have relatively flat upper and lower surfaces and have a narrow thickness in contrast to their width, unlike conventional yarns or metal wires which have a predominantly circular cross-sectional shape.
  • the warp comprises a series of metal strips and the weft comprises threads which have a silicone covering.
  • the metal strips of the warp preferably comprise metal ribbons but alternatively may comprise flat plaited metal straps or braided, flat rolled metal straps.
  • the strips have a thickness between 0.05 mm and 0.2 mm inclusive.
  • the strips have a thickness between 0.1 mm and 0.15 mm inclusive.
  • the strips have a width of least 2.0 mm.
  • the strips have a width of between 4.0 mm and 5.00 mm inclusive.
  • the weft comprises at least one of silicone covered metal wire, silicone covered stranded metal wire, silicone covered aramide yarns, silicone covered glass threads or filaments, solid silicone threads, aromatic polyamide yarn, wire wrapped polyamide yarn, and glass threads.
  • the metal strips are made from copper or a copper alloy.
  • the strips are made from unannealed copper or brass.
  • Fig. 1 is a plan view of a portion of a press pad according to the invention woven in a plain weave
  • Fig. 2 is a view similar to Fig. 1 but of a press pad woven in a twill weave;
  • Figs. 3 and 4 are diagrammatic cross-sections of the weaves shown in Figs. 1 and 2 respectively;
  • Fig. 5 is a cross sectional view, to an increased scale, of the press pad shown in Fig. 1 prior to any use;
  • Fig. 6 is a view similar to Fig. 5 but after use of the press pad
  • Fig. 7 is a diagram showing the conventional arrangement of a laminate sheet and press pads in a single daylight press
  • Fig. 8 is a cross sectional view, to an increased scale of a conventional press pad prior to any use.
  • Fig. 9 is a view similar to Fig. 8 of the same conventional press pad after it has been worn out through use .
  • a press pad 12 for use in a laminate press comprises a woven fabric which is made of materials that are heat resistant to at least 220 C C and substantially resistant to pressures ranging between 20 and 100 kg per cm 2 inclusive.
  • the press pad 12 is suitable for use in high pressure, short cycle presses which are used for producing high density laminates such as laminated floorboards where the pressures used are up to 70 kg per cm 2 at temperatures around 200°C.
  • the press pad 12 is also suitable for use in low pressure single daylight and raulti daylight presses.
  • the press pad 12 comprises warp threads 13 and the weft threads 14, at least one of which comprises metal strips 15.
  • the warp threads 13, the weft threads 14 or both may comprise the metal strips 15, in the examples shown in the drawings it is the warp threads 13 which wholly comprise the metal strips 15.
  • the strips 15 could be interspersed with warp threads such are used in conventional press pads, for example metal wire, aromatic polyamide yarns and the like.
  • Figs. 1 and 2 show two examples of weaves suitable for use in the manufacture of a press pad according to the invention. However, it will be appreciated that many other types of weave could be used.
  • weave cross-sections corresponding to these examples are shown in a conventional manner in Figs. 3 and 4 respectively.
  • weft A which is shown in cross section with the warp B interweaving therebetween.
  • the weave comprises a single ply plain or linen weave.
  • the warp threads B namely the strips 15, pass over and under a single weft thread A at a time.
  • the warp threads B in the form of the strips 15 pass alternatively under and over two weft threads A and the woven fabric has the same amount of warp material on both faces of the fabric, which thus presents the same appearance on both sides.
  • the twill weave of Figs 2 and 4 provides a press pad with surfaces wherein the metal strips 15 run for a longer distance over the weft threads 14 than in the linen weave of Figs 1 and 3.
  • This provides a pad which has a smoother metal surface with a metal herringbone pattern formed thereon. This may be advantageous in some applications.
  • the warp threads are wound around a warp beam, pass over a back rest and through the eyes of healds or heddles before passing through the interstices in the reed behind which the shuttle plies to and fro carrying the weft thread.
  • the healds or heddles form part of the shedding harness and comprise shafts carrying steel wire eyes which are normally circular to accommodate warp threads that are of a predominantly circular cross section. It will be appreciated that to accommodate strips as proposed in the present invention the shape of the eyes in the healds or heddles will have to be altered in order to accommodate the strips.
  • the strips 15 comprise flat metal ribbons. However, they could also comprise flat plaited metal straps or braided, flat rolled metal straps, both of which are made from plaited or braided metal filaments or thin wires.
  • the strips 15 preferably have a thickness between 0.05 mm and 0.2 mm inclusive and advantageously a thickness between 0.1 mm and 0.15 mm inclusive. If the strips 15 are too thin, then they will not be strong enough to withstand the pressures they will encounter in use and may split. However, if the strips are too thick they cannot be woven successfully. In particular as will be described below with reference to Fig. 5, it is important for the strips 15 to bend or crimp around the threads of the weft 14 during weaving in order to minimize shrinkage of the press pad lengthwise during use. Shrinkage occurs because when the pad is subjected to high pressure within a press, the pressure causes the metal strips 15 to be castellated around and into close contact with the weft threads 14.
  • warp threads 13 are woven with an insufficient contact around the weft threads 14 initially, then in use these threads 13 are forced into a greater contact with the weft threads 14 which causes them to be pulled into the pad, thus causing it to shrink lengthwise along the warp. Shrinkage of the order of 10% and greater can occur in these cases.
  • the strips 15 are at least 2.00 mm wide but advantageously from the point of view of heat transfer through the pad, the strips 15 have a width of between 4.00 mm and 5.00 mm inclusive.
  • the strips 15 are made from a metal which has high heat transference properties.
  • the strips 15 are made from copper or a copper alloy.
  • the strips 15 comprise either unannealed copper or brass.
  • the weft threads 14 of the press pad and any warp threads 13 which do not comprise the metal strips 15 preferably comprise one or more of the following:- silicone covered metal wire; silicone covered stranded metal wire; silicone covered aramide yarns: silicone covered glass threads or filaments; solid silicone threads; aromatic polyamide yarn; wire wrapped polyamide yarn; glass thread.
  • metal strands such as copper or stainless steel strands may be wrapped with an aromatic polyamide yarn in a conventional manner and stainless steel strands may also be used to braid the exterior of silicone covered copper wires.
  • the weft threads 14 comprise silicone covered threads or wires, such as copper wire, as shown in Fig. 5.
  • each warp thread 13 comprises a metal strip 15 and each weft thread 14 comprises a stranded copper wire core 16 with an extruded silicone elastomeric outer covering 17.
  • the specific gravity of the silicone elastomeric covering 17 falls within the range of 1.1 g/cm 3 to 1.4 g/cm 3 inclusive in order to secure the best properties wherein it is neither sufficiently springy under compression nor too brittle.
  • the wall thickness dl of the covering 17 is preferably at least 0.2 mm and the overall outside diameter d2 of the silicone covered wire is at least 1.0 mm and preferably around 1.4 mm.
  • the metal core 16 comprises stranded or braided wire which comprises at least 7 wire strands and has an overall diameter d3 of around 0.6 mm.
  • the metal strips 15 of the warp are less likely to cut into the silicone covering 17 and therefore much less likely to come into direct contact with the metal cores 16 of the weft threads 14, in contrast to the used conventional pad shown in Fig. 9.
  • the relative thicknesses of the metal strips 15 and the silicone covering 17 are also relevant here and the relative thinness of the strips 15 helps to retain a significant thickness of silicone between the strips 15 and the metal cores 16 of the weft even when subjected to high pressures.
  • the life of the pad 12 will be greatly increased over a conventional pad, particularly when used for pressing high density laminates such as laminated floorboards and high density fibreboard and the like which have very little inherent resilience of their own.
  • the heat transfer capability of the press pad as shown in Fig. 5 will also be increased over that of the conventional press pad shown in Fig. 8.
  • the metal strips 15 exhibit a greatly increased area which will contact the platens of a press over the metal wires of the warp 7 of the conventional pad 5, thus increasing the speed of heat conduction through the pad.
  • the weight of metal in a press pad according to the invention as shown in Fig. 5 is approximately 50% lower than that of the conventional pad 5. This means that the new pad will heat up significantly faster than the conventional pad and therefore be faster to transmit the required temperature through to the laminate sheet being pressed. As a result, pressing cycles can be kept to a minimum, making the pad more efficient in use than a conventional pad.
  • the reduction in metal content in the new press pad over the conventional pad 5 also has the additional advantage of making the pad lighter in weight, facilitating the handling and manipulation of large press pads by press operatives .

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Woven Fabrics (AREA)
  • Laminated Bodies (AREA)

Abstract

La présente invention concerne un coussinet de pression destiné à une contrecolleuse et en particulier, à une contrecolleuse à haute pression et cycle court. Le coussinet de l'invention comprend une étoffe tissée (12) dans des fils résistant à la chaleur, les fils de chaîne (13) ou les fils de trame (14) au moins comprenant des rubans métalliques (15). De préférence, les fils de chaîne (13) sont entièrement composés d'une série de rubans de laiton ou de cuivre non recuit (15) présentant une épaisseur comprise entre 0,1 et 0,15 mm et une largeur comprise entre 4,0 et 5,0 mm. De préférence, les fils de trame (14) comprennent des fils revêtus de silicone (17) d'une épaisseur d'au moins 0,2 mm.
PCT/GB1999/002038 1998-07-01 1999-06-29 Ameliorations apportees aux coussinets de pression WO2000001522A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
AU45241/99A AU4524199A (en) 1998-07-01 1999-06-29 Improvements to press pads
CA002333722A CA2333722A1 (fr) 1998-07-01 1999-06-29 Ameliorations apportees aux coussinets de pression
EP99928122A EP1091845A1 (fr) 1998-07-01 1999-06-29 Ameliorations apportees aux coussinets de pression

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB9814133.6A GB9814133D0 (en) 1998-07-01 1998-07-01 Improvements to press pads
GB9814133.6 1998-07-01

Publications (1)

Publication Number Publication Date
WO2000001522A1 true WO2000001522A1 (fr) 2000-01-13

Family

ID=10834672

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1999/002038 WO2000001522A1 (fr) 1998-07-01 1999-06-29 Ameliorations apportees aux coussinets de pression

Country Status (7)

Country Link
EP (1) EP1091845A1 (fr)
CN (1) CN1307521A (fr)
AU (1) AU4524199A (fr)
CA (1) CA2333722A1 (fr)
GB (1) GB9814133D0 (fr)
TR (1) TR200003823T2 (fr)
WO (1) WO2000001522A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001076861A1 (fr) * 2000-04-08 2001-10-18 Marathon Belting Limited Coussinets de pression
EP1167007A1 (fr) * 2000-06-21 2002-01-02 Thomas Josef Heimbach Gesellschaft mit beschränkter Haftung Coussinet pour presse et presse à plaques chauffantes avec un tel coussinet
EP1300235A1 (fr) * 2001-09-27 2003-04-09 Thomas Josef Heimbach Gesellschaft mit beschränkter Haftung & Co. Coussinet pour presse
US6780280B2 (en) 2001-09-27 2004-08-24 Thomas Josef Heimbach Gesellschaft Mit Beschrankter Haftung & Co. Pressing cushion
EP2666623A3 (fr) * 2012-05-26 2016-07-20 Hueck Rheinische GmbH Procédé de fabrication d'un coussin de presse ainsi que fils d'élastomère correspondants et coussin de presse correspondant
WO2020187882A1 (fr) 2019-03-19 2020-09-24 Hueck Rheinische Gmbh Coussin de presse pour l'utilisation dans des presses chauffantes à un ou plusieurs étages

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101460008B (zh) * 2007-12-14 2010-06-02 英业达股份有限公司 具改进支撑织物结构的电路板
DE102018133542A1 (de) * 2018-12-21 2020-06-25 Hueck Rheinische Gmbh Presspolster sowie Verfahren zu dessen Herstellung

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1653243A1 (de) * 1966-07-01 1971-09-30 Jaervefelt Lars Erik Verfahren und Vorrichtung zum Herstellen von Spanplatten,Faserplatten u.dgl.
DE2405975A1 (de) * 1974-02-08 1975-08-21 Goldschmidt Ag Th Presspolster in form eines metallfaservlieses
WO1996013376A1 (fr) * 1994-10-26 1996-05-09 Marathon Belting Limited Coussinet pour presse

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1653243A1 (de) * 1966-07-01 1971-09-30 Jaervefelt Lars Erik Verfahren und Vorrichtung zum Herstellen von Spanplatten,Faserplatten u.dgl.
DE2405975A1 (de) * 1974-02-08 1975-08-21 Goldschmidt Ag Th Presspolster in form eines metallfaservlieses
WO1996013376A1 (fr) * 1994-10-26 1996-05-09 Marathon Belting Limited Coussinet pour presse

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001076861A1 (fr) * 2000-04-08 2001-10-18 Marathon Belting Limited Coussinets de pression
EP1167007A1 (fr) * 2000-06-21 2002-01-02 Thomas Josef Heimbach Gesellschaft mit beschränkter Haftung Coussinet pour presse et presse à plaques chauffantes avec un tel coussinet
EP1300235A1 (fr) * 2001-09-27 2003-04-09 Thomas Josef Heimbach Gesellschaft mit beschränkter Haftung & Co. Coussinet pour presse
US6780280B2 (en) 2001-09-27 2004-08-24 Thomas Josef Heimbach Gesellschaft Mit Beschrankter Haftung & Co. Pressing cushion
EP2666623A3 (fr) * 2012-05-26 2016-07-20 Hueck Rheinische GmbH Procédé de fabrication d'un coussin de presse ainsi que fils d'élastomère correspondants et coussin de presse correspondant
WO2020187882A1 (fr) 2019-03-19 2020-09-24 Hueck Rheinische Gmbh Coussin de presse pour l'utilisation dans des presses chauffantes à un ou plusieurs étages
JP2022528225A (ja) * 2019-03-19 2022-06-09 ヒュック ライニッシェ ゲゼルシャフト ミット ベシュレンクテル ハフツング 単段式加熱プレスまたは多段式加熱プレスに使用するためのプレスパッド
JP7302003B2 (ja) 2019-03-19 2023-07-03 ヒュック ライニッシェ ゲゼルシャフト ミット ベシュレンクテル ハフツング 単段式加熱プレスまたは多段式加熱プレスに使用するためのプレスパッド

Also Published As

Publication number Publication date
GB9814133D0 (en) 1998-08-26
CN1307521A (zh) 2001-08-08
TR200003823T2 (tr) 2001-06-21
CA2333722A1 (fr) 2000-01-13
AU4524199A (en) 2000-01-24
EP1091845A1 (fr) 2001-04-18

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