EP0728868A2 - Moule pour le séchage de corps fibreux moulés humides - Google Patents

Moule pour le séchage de corps fibreux moulés humides Download PDF

Info

Publication number
EP0728868A2
EP0728868A2 EP96102745A EP96102745A EP0728868A2 EP 0728868 A2 EP0728868 A2 EP 0728868A2 EP 96102745 A EP96102745 A EP 96102745A EP 96102745 A EP96102745 A EP 96102745A EP 0728868 A2 EP0728868 A2 EP 0728868A2
Authority
EP
European Patent Office
Prior art keywords
mold
molding
chamber
pulp molding
drying
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Withdrawn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
EP96102745A
Other languages
German (de)
English (en)
Other versions
EP0728868A3 (fr
Inventor
Kazuyuki Nishikawa
Naoshi Makiguchi
Yasuhiro Oyaizu
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.)
Sintokogio Ltd
Original Assignee
Sintokogio 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 JP6192595A external-priority patent/JPH08232199A/ja
Priority claimed from JP8614495A external-priority patent/JPH08260400A/ja
Application filed by Sintokogio Ltd filed Critical Sintokogio Ltd
Publication of EP0728868A2 publication Critical patent/EP0728868A2/fr
Publication of EP0728868A3 publication Critical patent/EP0728868A3/fr
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21J—FIBREBOARD; MANUFACTURE OF ARTICLES FROM CELLULOSIC FIBROUS SUSPENSIONS OR FROM PAPIER-MACHE
    • D21J7/00—Manufacture of hollow articles from fibre suspensions or papier-mâché by deposition of fibres in or on a wire-net mould

Definitions

  • This invention relates to a mold for drying a wet preformed pulp molding which is produced from fibrous material such as used-paper pulp and the like.
  • pulp moldings produced from fibers such as used-paper pulp or the like have been used.
  • a method to produce such a pulp molding is well-known, wherein fiber material is dispersed in a solution, and then the fiber-containing solution is sucked by a pulp-preforming mold provided with a sucking function, thereby preforming a wet pulp molding, which is then dried.
  • the first way has been replaced by a second way wherein the change of the dimensions or shape of a wet preformed pulp molding is restrained during its drying process.
  • Japanese Patent (A) 64-61600 teaches such a drying way wherein a wet preformed pulp molding is pressed between a pair of concave and convex molds, and wherein one of them supplies a hot-air flow which is sucked by the other mold, thereby applying the hot-air flow to the wet preformed pulp molding disposed between the molds. Since this way enables a uniform heat to be applied to the entire wet preformed pulp molding, it can produce a pulp molding of accurate dimensions and less deformation. Accordingly, generally this way has been adapted.
  • one mold which is pressed against the other mold, is made of cast aluminum, etc.
  • the press mold weighs a lot. It is also formed with a plurality of apertures therein and is provided with a wire mesh mounted on the surface thereof. Accordingly, when the hot air flow is applied to the mold, most of its heat energy is absorbed in the mold. Thus there is a drawback in that only a small part of the supplied heat energy is used to dry the preformed pulp molding.
  • This invention aims to cure the drawback and to provide a mold to dry a preformed pulp molding wherein the supplied heat energy is effectively used.
  • the mold includes a molding member and a chamber-forming member, both of which define a chamber therebetween.
  • the molding member holds a wet preformed pulp molding and has a plurality of apertures through which air passes towards the wet preformed pulp molding.
  • the inside wall of the chamber is coated with a thermal insulant, except for the molding member.
  • a hot-air supply means is connected to the chamber such that it supplies a hot-air flow into the chamber. Since the inside wall of the chamber is insulated, the heat energy of the hot air flow supplied by the hot-air supply means is effectively applied to the molding member of the mold and the wet preformed pulp molding.
  • the mold in another aspect includes a molding member and a chamber-forming member, both of which define a chamber therebetween.
  • the molding member holds a wet preformed pulp molding and has a plurality of apertures through which air passes towards the wet preformed pulp molding.
  • the molding member is formed of thick material that has a high thermal conductivity, and it is also heated by heating means mounted thereon.
  • An air supply means is connected to the chamber such that it supplies an air flow into the chamber. The air flow carries the heat from the heated molding member to the wet preformed pulp molding. Since the heating means are located adjacent the wet preformed pulp molding, the heat energy is effectively transmitted to it.
  • a wet preformed pulp molding means a pulp molding formed, for instance, on a screen such as a wire mesh by sucking a pulp-containing solution, which formed pulp molding is still wet or not dried, or such a pulp molding removed from a support on which it was formed.
  • a pulp molding means one that is made from wood pulp, plant pulp, or used-paper pulp, or it may mean any other fabric material.
  • Fig. 1 is a cross-sectional view of an embodiment of a mold of the present invention to dry a wet preformed pulp molding, shown together with a receiving mold.
  • Fig. 2 is a cross-sectional view of another embodiment of a mold of the present invention to dry a wet preformed pulp molding.
  • Fig. 3 is a cross-sectional view of a further embodiment of a mold similar to the one in Fig. 2.
  • Fig. 1 shows a pair of molds 1, 10, one receiving a wet preformed pulp molding M thereon and the other drying it.
  • the drying mold 10 is pressed against the receiving mold 1.
  • the receiving mold 1 has a surface that holds the preformed pulp molding M and that corresponds to its shape.
  • the mold 1 includes a main body 3 and a frame 4, which define a chamber 5 therebetween.
  • the main body 3, which receives the wet preformed pulp molding M, is formed over its entire surface with a plurality of throughbores 6 through which air can pass.
  • the frame 4 is provided with a vent pipe 7 connected to sucking means and pressure- applying means.
  • the drying mold 10 of the present invention includes a molding member 11.
  • This member has a surface that corresponds to the shape of a pulp molding to be produced.
  • the member 11 is formed such that when the molds 1 and 10 meet there will be a clearance between them, which clearance corresponds to the thickness of the pulp molding to be produced.
  • the molding member 11 is formed of a 1 - 3.2 mm-thick metal plate or plates such as steel plates provided with a plurality of air-vent throughbores 12 of a 1-10 mm diameter.
  • the opening ratio (i.e., the total opening area relative to the metal surface) of the molding member is about 25 - 70 %.
  • the method of forming the molding member 11 may be either of these two ways: making throughbores after shaping the plate, or shaping the plate after making throughbores. Generally, the latter way is advantageous because fewer processes are required.
  • the reason why the metal plate is made to be 1 - 3.2 mm thick is that if less than 1 mm thick the strength of the molding member 11 is insufficient when it is pressed against the receiving mold 1 even if it is reinforced with stiffeners, and that if more than 3.2 mm the strength of the member 11 is sufficient, but most of the heat energy of the hot-air flow supplied by the hot-air supply means (this is explained below) accumulates in the member 11, resulting in poor heat transmission to the preformed pulp molding M.
  • the opening ratio of the molding member 11 is made about 25 - 70 % is that if it is more than 70% its strength is insufficient when it is pressed, and that when shaping the member 11 after making the throughbores 12, processing such as bending and welding of the plate or plates becomes difficult. If the ratio is less than 25% the heat energy of the hot air flow is not sufficiently transmitted to the wet preformed pulp molding, and there will be loss of the pressure of the hot-air flow around the throughbores 12.
  • each throughbore 12 is made to be 1-10 mm is that if it is less than 1 mm effective use of the pressure of the hot-air flow is not attained through the throughbores 12, and forming throughbores in the metal plate becomes difficult after it is shaped. If the diameter is more than 10 mm, applying a uniform pressure to the preformed pulp molding becomes impossible. Thus the ranges of the factors of the molding member 11 described above were determined.
  • wire mesh 2 and/or wire mesh 13 on either or both of the molding surfaces of the receiving mold 1 and the drying mold 10 enables the hot-air flow to be well dispersed and enables it to be transmitted to the entire wet preformed pulp molding, and prevents impressions of the throughbores 6, 12 from remaining on the dried pulp molding.
  • these wire meshes 2, 13 are not necessary if the ratios of the openings of the throughbores 6, 12 are large and if their diameters are small.
  • the drying mold 10 includes a frame 14, or chamber-forming member, which engages the molding member 11 at the surface opposite its inner surface, which holds the wet preformed pulp molding M.
  • the frame 14 and the molding member 11 define a chamber 15 therebetween.
  • a stiffener 17 bridges the frame 14 and the member 11 to prevent the deformation of the member 11 when it is pressed against the receiving mold 1.
  • the stiffener is formed with an air-vent opening 17 or openings so that the hot-air flow can pass through the entire chamber 15.
  • the inside wall of the chamber is covered with a layer of insulant 18 such as glass wool, etc. to prevent the heat energy from being deprived of the hot air flow.
  • An air-supply means 19 is connected to the chamber 15 to supply a hot air flow into the chamber 15.
  • a method to dry a wet preformed pulp molding by using the drying mold 10 and receiving mold 1 will now be explained.
  • a receiving mold or pulp-preforming mold having a suction function (it is not shown in the drawings, but is the same as or similar to the receiving mold 1 in Fig. 1) is immersed in a slurry in which a fiber material of used-paper pulp, etc. is dispersed.
  • the slurry is sucked by the pulp-preforming mold and is deposited in a suitable amount on the main body of the mold (it is similar to the main body 3 in Fig. 1).
  • the mold is then taken out from the slurry.
  • the deposited layer of fibers is sucked to remove water from it, thereby producing a wet preformed pulp molding M. It is then removed from the pulp-preforming mold and put on the receiving mold 3, shown in Fig. 1.
  • the preformed pulp molding M is sucked by the receiving mold 1 and is simultaneously pressed by the drying mold 10.
  • the force to press the preformed pulp molding M depends on the density of a pulp mold to be produced, generally it is 1-10 kgf/cm 2 .
  • a hot-air flow is supplied to the chamber 15 by the air-supply means 19 while the pressing of the preformed pulp molding M continues.
  • the force of the source of the hot-air flow is about 0.5-5 kgf/cm 2 . This value is influenced by the pressing force applied to the preformed pulp molding M and its thickness.
  • the hot-air flow must be uniformly fed under high pressure to the preformed pulp molding M.
  • the pressing force is low, or if the preformed pulp molding M is thin, the hot-air flow can be sufficiently fed to it under low pressure.
  • the hot-air flow is supplied to the wet preformed pulp molding M for a suitable period while it is pressed. Thus the drawing process of the preformed pulp molding is completed. After this, the hot-air supply is stopped, and the drying mold 10 is moved apart from the receiving mold 1. The sucking operation of the receiving mold 1 is stopped, and a compressed air flow is applied to the formed pulp molding through the vent pipe 7 to remove it. Thus a final pulp molding is obtained.
  • a receiving mold 3 both to preform a wet pulp molding M in a slurry and to form it into a final pulp molding is advantageous in saving costs.
  • the shape of the pulp molding is complicated, it may engage the receiving mold, and possibly cannot be removed from it by compressed air.
  • the receiving mold 3 cannot be used for producing a wet preformed pulp molding when the mold is used to dry it, productivity will be less than when extra pulp-preforming molds are used.
  • Fig. 2 shows another embodiment of a drying mold 20 of the present invention.
  • the mold 20 includes a chamber-forming member 14 and a molding member 21 supported by the chamber-forming member 14.
  • a chamber 15 is defined by the chamber-forming member 14 and the molding member 21.
  • An air supply means 29 is connected to the chamber 15 so that it supplies an air flow into the chamber.
  • the molding member 21 is formed by binding, with a heat-resistant resin such as an epoxy resin or BT resin, grains of metal of 0.2-5.0 mm diameters that have a high heat conductivity, as for example, aluminum, copper, or steel.
  • a heat-resistant resin such as an epoxy resin or BT resin
  • grains of metal of 0.2-5.0 mm diameters that have a high heat conductivity, as for example, aluminum, copper, or steel.
  • the molding member 21 itself is porous, and the air flow supplied by the means 29 can pass through the porous molding member 21.
  • the molding member 21 is thick and is provided with a plurality of heaters 22 therein.
  • the heaters 22 may be electric, hot oil or water circulating-type heaters, or any other known one.
  • the air passes through the porous molding member 21, it deprives the member 21 of heat.
  • hot-air streams are applied to the preformed pulp molding M placed on the receiving mold 1 shown in Fig. 1.
  • the grain size of the metal is made 0.2-5.0 mm is that if it is smaller than 0.2 mm sufficient air cannot pass through the molding member 21, and that if it is larger than 5.0 mm bad impressions of the porous member 21 remaining on the surface of the pulp molding appear.
  • binders another material, e.g., solder such as copper or silver solder and glass material such as enamel and frit, which are melted to bind metal grains, may be used instead of resins.
  • Fig. 3 shows another embodiment of a drying mold 30 of the present invention.
  • a molding member 31 differs from that of the embodiment shown in Fig. 2.
  • the molding member 31 is comprised of a thick aluminum plate and is formed with a plurality of air-vent throughbores 6, 6.
  • the member 31 is also provided on its surface with a wire mesh 13.
  • Heaters 22 are embedded in the molding member 31. When an air-flow from air-supply means 29 passes through the throughbores 6,6, it deprives the member 31 of heat. Thus hot-air streams are applied to the preformed pulp molding M placed on the receiving mold 1 in Fig. 1.
  • a heating source is located adjacent the wet preformed pulp molding, and it has enough capacity to store heat. Thus the heat is effectively transmitted to the preformed pulp molding.
  • the inside wall of the chamber 15 may be covered with a thermal insulant.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Paper (AREA)
EP96102745A 1995-02-24 1996-02-23 Moule pour le séchage de corps fibreux moulés humides Withdrawn EP0728868A3 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP61925/95 1995-02-24
JP6192595A JPH08232199A (ja) 1995-02-24 1995-02-24 抄造体乾燥用型
JP8614495A JPH08260400A (ja) 1995-03-17 1995-03-17 抄造体の乾燥型
JP86144/95 1995-03-17

Publications (2)

Publication Number Publication Date
EP0728868A2 true EP0728868A2 (fr) 1996-08-28
EP0728868A3 EP0728868A3 (fr) 1997-06-11

Family

ID=26403019

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96102745A Withdrawn EP0728868A3 (fr) 1995-02-24 1996-02-23 Moule pour le séchage de corps fibreux moulés humides

Country Status (2)

Country Link
EP (1) EP0728868A3 (fr)
CA (1) CA2170181A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000058557A1 (fr) * 1999-03-26 2000-10-05 Southern Pulp Machinery (Pty) Limited Procede de moulage de la pate et systeme correspondant
US6332956B1 (en) * 1999-11-30 2001-12-25 Korea Recystes Co., Ltd. Pulp product manufacturing apparatus
US20120319335A1 (en) * 2009-11-13 2012-12-20 Nilsson Bjoern Pulp Mould Comprising Heating Element with Sintered Necks
JP2018501415A (ja) * 2014-12-22 2018-01-18 セルワイズ・エービー 工具または工具部品、工具または工具部品を含む装置、工具または工具部品の製造方法、およびパルプスラリーから製品を成形する方法
CN112853819A (zh) * 2021-01-07 2021-05-28 郭珍珍 一种纸浆模塑制品的无转移模具
CN114150536A (zh) * 2021-11-15 2022-03-08 绿赛可新材料(云南)有限公司 一种纸浆模塑二次热模压定型工艺

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1705780A (en) * 1926-06-05 1929-03-19 Olson John Method of making composition tubs
FR926633A (fr) * 1941-05-14 1947-10-07 Keyes Fibre Co Objets en fibre et résine agglomérées moulés individuellement en plusieurs couches
GB1111525A (en) * 1964-06-18 1968-05-01 Keyes Fibre Co Thermoplastic coating of molded pulp
US4448640A (en) * 1981-02-17 1984-05-15 Societe Anonyme Dite: Air Industrie Process and device for molding and drying objects made of fibrous materials

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1705780A (en) * 1926-06-05 1929-03-19 Olson John Method of making composition tubs
FR926633A (fr) * 1941-05-14 1947-10-07 Keyes Fibre Co Objets en fibre et résine agglomérées moulés individuellement en plusieurs couches
GB1111525A (en) * 1964-06-18 1968-05-01 Keyes Fibre Co Thermoplastic coating of molded pulp
US4448640A (en) * 1981-02-17 1984-05-15 Societe Anonyme Dite: Air Industrie Process and device for molding and drying objects made of fibrous materials

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000058557A1 (fr) * 1999-03-26 2000-10-05 Southern Pulp Machinery (Pty) Limited Procede de moulage de la pate et systeme correspondant
US6706151B1 (en) 1999-03-26 2004-03-16 Southern Pulp Machinery (Pty) Limited Pulp moulding process and related system
US6332956B1 (en) * 1999-11-30 2001-12-25 Korea Recystes Co., Ltd. Pulp product manufacturing apparatus
US20120319335A1 (en) * 2009-11-13 2012-12-20 Nilsson Bjoern Pulp Mould Comprising Heating Element with Sintered Necks
JP2018501415A (ja) * 2014-12-22 2018-01-18 セルワイズ・エービー 工具または工具部品、工具または工具部品を含む装置、工具または工具部品の製造方法、およびパルプスラリーから製品を成形する方法
US10801164B2 (en) 2014-12-22 2020-10-13 Celwise Ab Tool or tool part, system including such a tool or tool part, method of producing such a tool or tool part and method of molding a product from a pulp slurry
US11391001B2 (en) 2014-12-22 2022-07-19 Celwise Ab Tool or tool part, system including such a tool or tool part, method of producing such a tool or tool part and method of molding a product from a pulp slurry
CN112853819A (zh) * 2021-01-07 2021-05-28 郭珍珍 一种纸浆模塑制品的无转移模具
CN114150536A (zh) * 2021-11-15 2022-03-08 绿赛可新材料(云南)有限公司 一种纸浆模塑二次热模压定型工艺

Also Published As

Publication number Publication date
EP0728868A3 (fr) 1997-06-11
CA2170181A1 (fr) 1996-08-25

Similar Documents

Publication Publication Date Title
EP1757418A3 (fr) Procede de pressage sous injection de vapeur d'un panneau composite comprenant au moins une surface finie
CN101420651B (zh) 喇叭鼓纸的制造方法
EP0728868A2 (fr) Moule pour le séchage de corps fibreux moulés humides
RU96117582A (ru) Способ изготовления лигноцеллюлозного щита
US8147743B2 (en) Method for deforming a plastic plate
CN109262795A (zh) 一种利用微波预热的刨花板制备方法
CN107949473A (zh) 大型轻质模制材料及其制造方法
CA1315064C (fr) Methode et appareil de fabrication de panneaux de fibres
CA1053048A (fr) Methode de mise en forme de la pate de cellulose
US4950362A (en) Heat-insulating shaped fibrous articles and a process for producing them
JP2635560B2 (ja) 木屑、繊維および類似物の板の連続的製造法
EP0819043B1 (fr) Procede de fabrication de panneaux en lignocellulose
CN107847386A (zh) 大型轻质棺材及其制造方法
RU2175606C2 (ru) Металлический многослойный профилированный корпус и способ его получения
RU2001103649A (ru) Способ парового прессования древесно-волокнистой плиты, имеющей по меньшей мере одну отделанную поверхность
JPH0742100A (ja) パルプモ―ルドの製造方法
US4086313A (en) Method of making pressed board
JPH08260400A (ja) 抄造体の乾燥型
US5587121A (en) Method and apparatus for the production of a gas-pervious part in a gas-pervious mould and a product made by this method
US3418408A (en) Method for making ware producing mold members
CA2438201A1 (fr) Moule male a chauffage adapte
JP3772333B2 (ja) 水硬性無機質成形板の製造方法
CN207891653U (zh) 一种纸浆模塑吸浆模孔的排布与结构
JPH09309121A (ja) 熱プレス装置
JPH08232199A (ja) 抄造体乾燥用型

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: A2

Designated state(s): DE DK FR GB IT NL

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): DE DK FR GB IT NL

17P Request for examination filed

Effective date: 19971121

17Q First examination report despatched

Effective date: 19990917

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

Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN

18W Application withdrawn

Withdrawal date: 20000118