WO1998024602A1 - Objet stratifie et moule associe - Google Patents

Objet stratifie et moule associe Download PDF

Info

Publication number
WO1998024602A1
WO1998024602A1 PCT/NO1997/000324 NO9700324W WO9824602A1 WO 1998024602 A1 WO1998024602 A1 WO 1998024602A1 NO 9700324 W NO9700324 W NO 9700324W WO 9824602 A1 WO9824602 A1 WO 9824602A1
Authority
WO
WIPO (PCT)
Prior art keywords
plate portions
mould
curved
curvature
laminate
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.)
Ceased
Application number
PCT/NO1997/000324
Other languages
English (en)
Inventor
Fredrik Torsteinsen
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to AU51403/98A priority Critical patent/AU5140398A/en
Publication of WO1998024602A1 publication Critical patent/WO1998024602A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27D—WORKING VENEER OR PLYWOOD
    • B27D1/00—Joining wood veneer with any material; Forming articles thereby; Preparatory processing of surfaces to be joined, e.g. scoring
    • B27D1/04—Joining wood veneer with any material; Forming articles thereby; Preparatory processing of surfaces to be joined, e.g. scoring to produce plywood or articles made therefrom; Plywood sheets
    • B27D1/08—Manufacture of shaped articles; Presses specially designed therefor
    • B27D1/083—Presses specially designed for making the manufacture of shaped plywood articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27D—WORKING VENEER OR PLYWOOD
    • B27D1/00—Joining wood veneer with any material; Forming articles thereby; Preparatory processing of surfaces to be joined, e.g. scoring
    • B27D1/04—Joining wood veneer with any material; Forming articles thereby; Preparatory processing of surfaces to be joined, e.g. scoring to produce plywood or articles made therefrom; Plywood sheets
    • B27D1/08—Manufacture of shaped articles; Presses specially designed therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • 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
    • B29C33/00—Moulds or cores; Details thereof or accessories therefor
    • B29C33/42—Moulds or cores; Details thereof or accessories therefor characterised by the shape of the moulding surface, e.g. ribs or grooves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B1/00—Layered products having a non-planar shape

Definitions

  • the invention concerns a laminated object comprising successive laminate plate portions which are curved in a direction perpendicular to a longitudinal extension through the object.
  • the invention also concerns a mould for moulding a laminated object, comprising two mould halves which can be pressed together, the mould halves comprising corresponding successive shaping surfaces which are curved in a direction perpendicular to a longitudinal extension through the mould.
  • Laminated objects consisting of layers of material, often in the form of plywood, are used for furniture, especially chairs.
  • the most rational method of manufacturing laminated objects is by stacking the different layers on top of one another with intermediate layers of glue.
  • the stack is placed in a mould in a press, whereupon under the influence of pressure and possibly heat the layers of material are bent and pressed together to form the finished laminated object.
  • This bending process will cause the outermost layers of material in a bend to be stretched, while the innermost layers of material in the bend are compressed, with the result that delamination and cracks may occur.
  • the usual shape is a single-curved surface, such as a chair back, which may be produced with some degree of sliding between the layers during the pressing.
  • a single-curved surface such as a chair back
  • Finnish patent 34 604 describes a laminated body of a chair consisting of a substantially single-curved back and a substantially single-curved seat.
  • the back and the seat are connected in a transition section which is provided with wedge-shaped slits which taper off in towards the central part of the transition section.
  • Danish patent 147 173 mentions hot pressing of a polygonal plywood object with a strongly profiled transitional zone between a generally flat edge zone and a flat or weakly profiled central section. In order to counteract cracking in the transitional zone during pressing it is provided with wedge-shaped slits. During pressing of the plywood object the slits are closed, thus forming a continuous object, but in this case too there is no continuity in the layers of material, with the result that the transitional zone is weaker than the rest of the object.
  • the object of the invention is to provide a laminated object comprising curved, mutually connected laminate plate portions, wherein the layers of material should be continuous in transitional areas between the laminate plate portions, and wherein it should not be easy for fractures or delamination to occur in the transitional areas.
  • the object is further to provide a mould for moulding a laminated object comprising curved, mutually connected laminate plate portions, wherein the layers of material should be continuous in transitional areas between the laminate plate portions.
  • the claims specify the invention by the definition of a laminated object with a previously unknown shape, and where the layers of material are continuous, maintaining the strength of the laminate throughout the entire object.
  • the invention discloses a construction principle for a laminated object, which principle may form the basis for various products. Is should however be understood that the practical design of the object or product may also include an adaption of the shape according to known principles within the field. The final shape of the object may thus deviate somewhat from the definition in the claims.
  • curved plate portions and curved surfaces should in a practical design be understood as “substantially curved plate portions/surfaces”, also including angular plate portions/surfaces of a substantially curved nature.
  • equal curvature should be understood as “substantially equal curvature”.
  • Fig. 1 is a side view of a laminate plate which is bent according to prior art.
  • Figs. 2, 3 and 4 illustrate the principle of the inventive concept, applied on an object consisting of three curved laminate plate portions.
  • Fig. 5 illustrates a blank for a laminated object according to the invention.
  • Fig. 6 illustrates a mould for moulding a laminated object according to the invention.
  • Fig. 7 illustrates a ready-moulded object according to the invention.
  • Fig. 8 illustrates an object according to the invention, in the form of a chair.
  • Fig. 1 is a side view of a single-curved laminate, bent according to prior art by placing a stack of layers of material on top of each other with intermediate layers of glue, and pressing the stack to the finished laminate.
  • the laminate consists of three layers of material, an outer layer 1, a central layer 2 and an inner layer 3.
  • the outer layer 1 will be stretched and the inner layer 3 compressed, with the result that cracks 14 may occur in the outer layer of material. Delamination may also occur between the layers of material as a result of stresses in the laminate.
  • Minimum bending radii R for the laminate have therefore been laid down in the field, depending on material type, layer thickness and number of layers, in order to avoid delamination and cracking.
  • the bending of each layer of material must of course also be performed with a certain minimum radius, in order to avoid fractures in the layer of material.
  • Fig. 2 is a schematic side view of a laminated object according to the invention, consisting of three successive, mutually connected curved laminate plate portions 4, 5, 6.
  • the laminate plate portions are shown here only as surfaces without any thickness. Each plate portion thus defines a curved plane.
  • the first plate portion or plane 4 intersects and is continuously connected with the second plate portion or plane 5 along an intersecting line 7, which in the invention is designated turning line 7, and the second plate portion or plane 5 intersects and is continuously connected with the third plate portion or plane 6 along an intersecting line 8, designated turning line 8.
  • Fig. 3 shows the curved planes in fig. 2 in perspective. The turning lines are not shown here.
  • the curved planes 4, 5 and 6 illustrated in the figures are single-curved. The form of the plate portions may however deviate from the single-curved shape, as will be discussed later.
  • Fig. 4 shows the same plate portions or planes, where the parts of the plate portions which do not form a part of the object are omitted.
  • the planes 4, 5, 6 forms a continuous object, and thus fig. 4 in principle illustrates the finished laminated object. It is also illustrated here how the plate portions or planes 4, 5, 6 are curved in a direction perpendicular to a longitudinal extension 9 through the object.
  • the longitudinal extension 9 through the object is formed by lines of longitudinal extension in each plate portion or plane 4, 5, 6, which are mutually connected in the turning lines 7, 8.
  • each planes' curvature is symmetrical about the line of longitudinal extension in each plane, and the longitudinal extension 9 through the object is thus located in a symmetry plane through the three planes 4, 5, 6.
  • plane 4 and 6 are curved in the same direction, while plane 5 is curved in the opposite direction.
  • fig. 3 it is shown how adjacently located planes or plate portions on opposite sides of the turning line have equal, but oppositely directed curvature.
  • the curvature of the planes or the plate portions may have different shapes, such as circular, elliptical or parabolic.
  • the curvature may be constant or continuously increasing or decreasing in the direction of the object's longitudinal extension. Even if the curvature is continuously increasing or decreasing in the direction of the object's longitudinal extension, it will still be equal, but oppositely directed, on opposite sides of a turning line, due to the continuity of the plate portions through the turning line.
  • Fig. 5 illustrates a blank 10 for a laminated object according to the invention.
  • the blank is of a known type, consisting of a stack of material layers with intermediate layers of glue.
  • the layers of material are typically composed of plywood with the fibres running in different directions.
  • Fig. 6 illustrates a mould according to the invention for use in a press for manufacturing a laminate.
  • the mould comprises two mould halves, an upper part 1 1 and a lower part 12.
  • the mould's upper part 11 has three successive, curved, shaping surfaces 24, 25, 26, turning lines 27 and 28 and a longitudinal extension 29, corresponding to the plate portions 4, 5, 6, the turning lines 7 and 8 and the longitudinal extension 9.
  • the mould's lower part 12 similarly has three successive, curved, shaping surfaces 34, 35, 36, turning lines 37 and 38 and a longitudinal extension 39.
  • the surfaces 24, 25, 26, 34, 35, 36 are curved in a direction perpendicular to the longitudinal extension 29, 39 through the mould. Adjacently located surfaces of each mould half, e.g. surfaces 24, 25, are continuous through a turning line 27 which defines an intersection between the adjacently located mould surfaces 24, 25. Further the surfaces 24, 25 on opposite sides of the turning line 27 have equal, but oppositely directed curvature.
  • the surfaces' curvature may be single-curved to correspond to a single- curved curvature of the laminate plate portions.
  • the surfaces of the mould further corresponds to the planes 4, 5 and 6, and this discussion will consequently not be repeated.
  • Fig. 7 illustrates a ready-moulded laminated object according to the invention, moulded by the blank in fig. 5 with the mould in fig. 6.
  • the ready - moulded object consists of three sections or plate portions 44, 45, 46, turning lines 47 and 48 and a longitudinal extension 49, corresponding to the planes 4, 5, 6, the turning lines 7 and 8 and the longitudinal extension 9.
  • the laminated object in fig. 7 consist of several layers of material which all have minimum requirements to bending radius, the actual bending of each layer will take place in a bending or turning area on both sides of the turning lines.
  • Fig. 8 illustrates a chair which comprises a laminated object according to the invention, where the laminated object is composed of a chair back 54, an intermediate section 55 and a seat 56, connected by turning lines 57 and 58, fundamentally corresponding to the planes 4, 5, 6 and the turning lines 7, 8.
  • the longitudinal extension is not physical line, it is not illustrated in fig. 8.
  • the turning line is an intersecting line between the two curved planes which are located on each side of the turning line, and the turning line therefore becomes a curved line. This is in sharp contrast with turning or bending lines in known manufacture of laminated objects, which are straight or almost straight.
  • the bending of the laminates is performed perpendicularly to the turning line.
  • the laminate is bent only in a plane perpendicular to the turning line, while in the invention, where the turning line is curved, the bending also takes place in a direction along the bending line, thus making the bending three-dimensional.
  • the bending of each layer of material in the laminate follows its own turning line. Moreover, the bending of each of the layers of material in the laminate is performed with a minimum radius in order to avoid cracking of the material layer concerned, since the requirement for a minimum radius when bending each material layer is naturally not changed by the invention.
  • the total bending of the layers of material in the laminate therefore extends over a bending or turning area about a common theoretical turning line.
  • the invention provides a laminated object and a mould for moulding a laminated object which fulfil the object of the invention, viz. that in the transitional areas between curved, connected laminate plate portions the laminate should have continuous layers of material in which it is not easy for fractures or delamination to occur.
  • the inventive concept may be employed together with known principles for manufacturing laminated objects, where rounding, adaptations and curved sections can be given a certain extension depending on the laminate material, the number of layers of material and the thickness of the layers, thereby making it easy for a person skilled in the art to manufacture an object which will deviate from the exact shape as described above.
  • An example of such an adaptation may be to give a turning area in connection with the turning line 57 in fig. 8, a certain extension in the direction of the objects longitudinal extension, thus giving the back 54 a comfortable rounding in its lower section.
  • Such an adapted object will naturally still be within the scope of the invention as it is defined in the claims.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Laminated Bodies (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Veneer Processing And Manufacture Of Plywood (AREA)

Abstract

L'invention concerne un objet stratifié comprenant des portions de plaques stratifiées (4, 5, 6), successives et recourbées dans une direction perpendiculaire à une extension longitudinale (9) placée en travers de l'objet. Des portions de plaques stratifiées (4, 5), placées de manière adjacente, sont reliées de façon continue au moyen d'une ligne courbe (7) formant une intersection entre les portions de plaques adjacentes (4, 5). Les portions de plaques stratifiées (4, 5) disposées de part et d'autre de cette ligne (7), présentent une courbure égale, mais dirigée en sens inverse. L'invention concerne également un moule destiné au moulage de cet objet stratifié.
PCT/NO1997/000324 1996-12-05 1997-12-04 Objet stratifie et moule associe Ceased WO1998024602A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU51403/98A AU5140398A (en) 1996-12-05 1997-12-04 Laminated object and mould

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO965205A NO301155B1 (no) 1996-12-05 1996-12-05 Laminert gjenstand og form til fremstilling av en laminert gjenstand
NO965205 1996-12-05

Publications (1)

Publication Number Publication Date
WO1998024602A1 true WO1998024602A1 (fr) 1998-06-11

Family

ID=19900146

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NO1997/000324 Ceased WO1998024602A1 (fr) 1996-12-05 1997-12-04 Objet stratifie et moule associe

Country Status (3)

Country Link
AU (1) AU5140398A (fr)
NO (1) NO301155B1 (fr)
WO (1) WO1998024602A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR906269A (fr) * 1942-09-18 1945-12-28 Erwin Behr Dispositif de moulage à la presse de pièces en bois plaqué à surfaces courbes
FI34604A (fi) * 1956-10-03 1964-11-10 Stomme till stol, sittsoffa eller dylikt
US3878015A (en) * 1972-08-01 1975-04-15 Sterling Bruce Inc Method of molding curved veneer laminated stock
WO1981002541A1 (fr) * 1980-03-04 1981-09-17 T Smedegard Procede de fabrication d'un article de placage par compression a chaux et outil de presse pour la mise en oeuvre du procede
EP0106427A1 (fr) * 1982-05-21 1984-04-25 Stow & Davis Furniture Company Procédé et appareil pour courber le bois
DE3733254A1 (de) * 1987-10-01 1989-04-20 Gerd Lange Design Formstreifen oder -staebe aus holzwerkstoff

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR906269A (fr) * 1942-09-18 1945-12-28 Erwin Behr Dispositif de moulage à la presse de pièces en bois plaqué à surfaces courbes
FI34604A (fi) * 1956-10-03 1964-11-10 Stomme till stol, sittsoffa eller dylikt
US3878015A (en) * 1972-08-01 1975-04-15 Sterling Bruce Inc Method of molding curved veneer laminated stock
WO1981002541A1 (fr) * 1980-03-04 1981-09-17 T Smedegard Procede de fabrication d'un article de placage par compression a chaux et outil de presse pour la mise en oeuvre du procede
EP0106427A1 (fr) * 1982-05-21 1984-04-25 Stow & Davis Furniture Company Procédé et appareil pour courber le bois
DE3733254A1 (de) * 1987-10-01 1989-04-20 Gerd Lange Design Formstreifen oder -staebe aus holzwerkstoff

Also Published As

Publication number Publication date
AU5140398A (en) 1998-06-29
NO965205A (no) 1997-09-22
NO965205D0 (no) 1996-12-05
NO301155B1 (no) 1997-09-22

Similar Documents

Publication Publication Date Title
US5901428A (en) Method for manufacturing a heat shield
KR900000677B1 (ko) 주름잡힌 합성수지부재의 제조방법 및 그 제조장치
KR20110043588A (ko) 경사진 스티프너 및 이를 제조하기 위한 장치 및 방법
US3351441A (en) Shape, constitution and processes for manufacturing materials derived from developable chevroned configurations
JP2003220652A (ja) 平らなコアおよびその平らなコアに結合した湾曲した部品から製造されたシート、およびそのシートの製造方法
CA2459167A1 (fr) Structure en materiau composite
KR20020045603A (ko) 고강도 벽과 덮개 조립체를 위한 구조용 샌드위치 패널을 제조하기 위한 방법
WO1998024602A1 (fr) Objet stratifie et moule associe
CN102099176B (zh) 倾斜加强件和设备以及用于形成该倾斜加强件和设备的方法
FI97788C (fi) Komposiittirakenteinen runko ja menetelmä sen valmistamiseksi
CN101804648B (zh) 侧部圆头包角的复合板材的加工模具和侧部圆头包角的复合板的制造方法
US5064493A (en) Method of producing curved honeycomb core material having crimps in one edge
US2081638A (en) Round corner
JP2619774B2 (ja) 補強用溶着リブを有するブロー成形体の製造方法
US2033809A (en) Method of producing grave vault hoods
US12552068B2 (en) Method of making an object from plywood
KR102816054B1 (ko) 원통형 샌드위치 구조체 및 원통형 샌드위치 구조체의 제조방법
CN116461156B (zh) 复合材料多面体产品制造方法及复合材料多面体
JPS633816Y2 (fr)
US2697461A (en) Method of making spirals for hollow panel structures
US12508748B2 (en) Mat and method to manufacture mat
SU968245A1 (ru) Многослойна панель
US1956533A (en) Method for producing inflatable rubber articles
JPH04100839U (ja) 複合材構造体
JPH04458B2 (fr)

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AL AM AT AU AZ BA BB BG BR BY CA CH CN CU CZ DE DK EE ES FI GB GE GH HU ID IL IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MD MG MK MN MW MX NO NZ PL PT RO RU SD SE SG SI SK SL TJ TM TR TT UA UG US UZ VN YU ZW AM AZ BY KG KZ MD RU TJ TM

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): GH KE LS MW SD SZ UG ZW AT BE CH DE DK ES FI FR GB GR IE IT LU MC

DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)
121 Ep: the epo has been informed by wipo that ep was designated in this application
REG Reference to national code

Ref country code: DE

Ref legal event code: 8642

122 Ep: pct application non-entry in european phase