DE2730997C2 - Corrugated cardboard structure - Google Patents
Corrugated cardboard structureInfo
- Publication number
- DE2730997C2 DE2730997C2 DE2730997A DE2730997A DE2730997C2 DE 2730997 C2 DE2730997 C2 DE 2730997C2 DE 2730997 A DE2730997 A DE 2730997A DE 2730997 A DE2730997 A DE 2730997A DE 2730997 C2 DE2730997 C2 DE 2730997C2
- Authority
- DE
- Germany
- Prior art keywords
- areas
- corrugated cardboard
- distance
- bent
- corrugated
- 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.)
- Expired
Links
Classifications
-
- 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
- B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form
- B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
- B32B3/28—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by a layer comprising a deformed thin sheet, i.e. the layer having its entire thickness deformed out of the plane, e.g. corrugated, crumpled
-
- 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 general shape other than plane
-
- 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
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/22—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
- B32B5/24—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer
- B32B5/26—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer another layer next to it also being fibrous or filamentary
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C2/00—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels
- E04C2/30—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by the shape or structure
- E04C2/34—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by the shape or structure composed of two or more spaced sheet-like parts
- E04C2/3405—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by the shape or structure composed of two or more spaced sheet-like parts spaced apart by profiled spacer sheets
-
- 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
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
- B29C43/20—Making multilayered or multicoloured articles
- B29C43/203—Making multilayered articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
- B29K2995/0001—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds having particular acoustical properties
- B29K2995/0002—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds having particular acoustical properties insulating
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C2/00—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels
- E04C2/30—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by the shape or structure
- E04C2/34—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by the shape or structure composed of two or more spaced sheet-like parts
- E04C2/3405—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by the shape or structure composed of two or more spaced sheet-like parts spaced apart by profiled spacer sheets
- E04C2002/3444—Corrugated sheets
- E04C2002/3466—Corrugated sheets with sinusoidal corrugations
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C2/00—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels
- E04C2/30—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by the shape or structure
- E04C2/34—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by the shape or structure composed of two or more spaced sheet-like parts
- E04C2002/3494—Apparatus for making profiled spacer sheets
Description
Die Erfindung betrifft ein Verfahren der im Oberbegriff des Patentanspruchs 1 beschriebenen Art.The invention relates to a method of the type described in the preamble of claim 1.
Ein derartiges Verfahren ist aus der US-PS 24 22 998 bekannt. Dabei wird das in den Biegebereichen falten- und kniffefreie Wellpappenformteil dadurch hergestellt, daß eine einseitig offene Wellpappenplatte zusammen mit einer die offene Seite später abdeckenden Abdeckschicht in einer Presse so verformt wird, daß während des Biegevorgangs die gewellte Zwischenschicht der Wellpappenplatte über die mit ihr erst noch zu verbindende Abdeckschicht gleiten kann.Such a method is known from US Pat. No. 2,422,998. The folds in the bending areas and kink-free corrugated cardboard molding produced by putting together a sheet of corrugated cardboard open on one side is deformed with a cover layer later covering the open side in a press so that during the bending process, the corrugated intermediate layer of the corrugated cardboard over the with her to be connected cover layer can slide.
Mit der nicht vorveröffentlichten DE-OS 26 02 839 wurde vorgeschlagen, die Falten und Kniffe beim Herstellen eines Wellpappenplattenformteils durch Beschichten der Wellpappe zumindest in den Bereichen, in denen Falten und Kniffe auftreten, mit einem Polyurethanmaterial auszugleichen, der diese beschädigten Stellen des Wellpappenformteils ausfüllt und verstärkt.With the unpublished DE-OS 26 02 839 it was proposed to remove the folds and tricks when Production of a corrugated board molding by coating the corrugated board at least in the areas in which wrinkles and creases appear, compensate with a polyurethane material that damaged them Fills and reinforces places of the corrugated cardboard molding.
Aufgabe der Erfindung ist es, ein Verfahren der im Oberbegriff des Anspruchs 1 genannten Art so weiterzubilden,
daß unter Erhalt der Falten- und Kniffefreiheit in den gebogenen Bereichen der Abdeckschichten von
einer fertigen Wellpappenplatte ausgegangen werden kann.
Bei einem Verfahren der genannten Art ist diese Aufgabe gemäß der Erfindung durch die im kennzeichnenden
Teil des Anspruchs 1 angegebenen Merkmale gelöst.The object of the invention is to develop a method of the type mentioned in the preamble of claim 1 in such a way that a finished corrugated board can be assumed while maintaining the freedom from wrinkles and creases in the curved areas of the cover layers.
In a method of the type mentioned, this object is achieved according to the invention by the features specified in the characterizing part of claim 1.
Das erfindungsgemäße Verfahren zeichnet sich dadurch aus, daß eine in der Presse zu verfemendeThe inventive method is characterized in that a to be ostracized in the press
ίο fertige Wellpappenplatte, die also aus einer mit den beiden Abdeckschichten fest verbundenen gewellten Zwischenschicht besteht, in den gebogenen Bereichen des herzustellenden Wellpappenformteils auf eine geringere Stärke zusammengedrückt wird, als dieses in den übrigen Bereichen des Wellpappenformteils der lall ist. Durch die Verminderung der Dicke in den gebogenen Bereichen des Wellpappenformteils wird die beim Biegen der Wellpappenplatte auftretende Verkürzung der Bogenlänge auch an der inneren Abdeckschicht kompensiert Mit Hilfe dieser sehr einfachen Maßnahme kann daher die Ausbildung von Falten oder Kniffen in den gebogenen Bereichen eines Wellpappenformteils sicher verhindert werden.ίο finished corrugated board, which is made of one with the corrugated intermediate layer firmly connected to both cover layers, in the curved areas of the corrugated cardboard molding to be produced is compressed to a lower thickness than this in the other areas of the corrugated cardboard molding is the lall. By reducing the thickness in the bent areas of the corrugated cardboard molding, the shortening that occurs when the corrugated cardboard sheet is bent the arc length is also compensated on the inner cover layer with the help of this very simple Measure can therefore be the formation of folds or kinks in the curved areas of a corrugated cardboard molding can be safely prevented.
Die Erfindung betrifft sodann eine Presse zur Durchführung des zunächst vorgeschlagenen Verfahrens. Ausgegangen wird von einer Presse, wie sie im Oberbegriff des Patentanspruchs 3 angegeben und aus der US-PS 24 22 998 bekannt ist. Gemäß diesem Teil der Erfindung ist eine Presse der genannten Art in der im kennzeichnenden Teil des Anspruchs 3 angegebenen Weise ausgestaltetThe invention then relates to a press for carrying out the method initially proposed. It is assumed that a press as specified in the preamble of claim 3 and from the US-PS 24 22 998 is known. According to this part of the invention, a press of the type mentioned is in the im characterizing part of claim 3 specified manner designed
Durch diese Ausgestaltung wird erreicht daß beim Pressen der Wellpappenplatte das sich dadurch ergebende Wellpappenformteil in seinen gebogenen Bereichen auf eine geringere Stärke zusammengedrückt wird, als dieses in den übrigen Bereichen des Wellpappenformteils der Fall ist.This configuration ensures that when the corrugated board is pressed, the result is that resulting corrugated cardboard molding compressed in its curved areas to a smaller thickness than is the case in the other areas of the corrugated cardboard molding.
Es folgt die Beschreibung eines in der Zeichnung gezeigten Ausführungsbeispiels, im einzelnen zeigtThe following is a description of an exemplary embodiment shown in the drawing, in detail
Fig. 1 im vergrößerten MaSstab eiaen Längsschnitt von Matrize und Patrize einer Ausführungsform der Presse zur Durchführung des erfindungsgemäßen Verfahrens und1 shows a longitudinal section on an enlarged scale of die and male mold of an embodiment of the press for carrying out the invention Procedure and
F i g. 2 ein gebogenes Wellpappenformteil, das nach dem erfindungsgemäßen Verfahren hergestellt worden ist.F i g. 2 shows a bent corrugated cardboard molding which has been produced by the method according to the invention is.
Beim Verfahren wird jeder zu biegende Bereich der als Ausgangsmaterial verwendeten Wellpappenplatte unelastisch zusammengedrückt, so daß er eine Dicke hat, die kleiner als die Dicke der nicht gebogenen Bereiche der Wellpappenplatte ist. Dabei wird der zu biegende Bereich vor oder gleichzeitig mit dem Zusammendrücken unelastisch so verformt, daß er einen gebogenen Querschnitt hat. Der zu biegende Bereich der Wellpappenplatte wird zusammengedrückt, indem eine Kraft auf den Rohling in eine Richtung ausgeübt wird, die im wesentlichen senkrecht zu den Flächen der ursprünglichen Wellpappenplatte verläuft. Diese wird im erwärmten Zustand gehalten, während sie zusammengedrückt und verformt wird.In the process, each area to be bent is made of the corrugated cardboard used as the starting material inelastically compressed so that it has a thickness which is less than the thickness of the non-bent Areas of the corrugated board is. The area to be bent is in front of or at the same time as the Compression inelastic deformed so that it has a curved cross-section. The one to be bent The area of the corrugated board is compressed by exerting a force on the blank in one direction which is substantially perpendicular to the surfaces of the original corrugated board. This is kept in the heated state while it is compressed and deformed.
Eine Presse zur Durchführung dieses Verfahrens ist in gleicher Weise konstruiert und angeordnet wie eine herkömmliche Presse. Im Vergleich mit einer solchen hat die Presse jedoch Matrize und Patrize 46 und 48 mit ausgesparten und vorstehenden Wandbereichen 50 bzw. 52, zwischen denen ein Zwischenraum 54 entsteht, dessen Form der gewünschten Form eines gebogenen Wellpappenformteils entspricht, die teilweise in Fie.2A press for performing this procedure is in designed and arranged in the same way as a conventional press. Compared with such however, does the press have a die and patrix 46 and 48 with recessed and protruding wall areas 50 or 52, between which a gap 54 arises, the shape of which is the desired shape of a curved Corrugated cardboard molding, some of which is shown in Fig. 2
dargestellt ist. Der Zwischenraum 54 hat wenigstens einen Bereich 54a, der im Längsschnitt gegenüber dem übrigen Bereich des Zwischenraums 54 gebogen ist und dessen Dicke kleiner als die des übrigen Bereiches des Zwischenraums 54 ist, so daß der Abstand h des gebogenen Bereichs 54a kleiner als der Abstand k des übrigen Bereiches des Zwischenraums 54 ist Fig.2 zeigt einen Teil eines teilweise gebogenen Wellpappenformteiis, das aus einer flachen Wellpappenplatte hergestellt worden ist, die aus zwei im Abstand angeordneten, parallelen Abdeckschichten 56 und 56' und einer gewellten Zwischenschicht 58 besteht, die zwischen den Abdeckschichten 56 und 56' angeordnet und an den oberen Enden ihrer Stege mit den jeweiligen inneren Flächen der Abdeckschichten 56 und 56' verbunden ist Das Wellpappenformteil weist außerdem einen Bereich 60 auf, der in dem Bereich 54a verringerter Dicke des Zwischenraums 54 zwischen Matrize und Patrize 46 und 48 eingeklemmt worden ist und deshalb von dem übrigen Bereich des Wellpappenformteils gekrümmt und auf die Dicke zusammengedrückt worden ist die geringer als die Dicke de«·, übrigen Bereiches istis shown. The intermediate space 54 has at least one area 54a which is curved in longitudinal section with respect to the remaining area of the intermediate space 54 and whose thickness is smaller than that of the remaining area of the intermediate space 54, so that the distance h of the curved area 54a is smaller than the distance k des 2 shows a part of a partially bent corrugated cardboard molded part which has been produced from a flat sheet of corrugated cardboard, which consists of two spaced, parallel cover layers 56 and 56 'and a corrugated intermediate layer 58 which lies between the cover layers 56 and 56 'and is connected at the upper ends of their webs to the respective inner surfaces of the cover layers 56 and 56' 48 has been pinched and therefore from the rest of the corrugated board The molded part has been curved and compressed to the thickness which is less than the thickness of the remaining area
Der Bereich 54a des Zwischenraums 54 kann stufenweise, wie es bei 50a dargestellt ist von dem übrigen Bereich des Zwischenraums 54 verringert werden, so daß der zusammengedrückte und gebogene Bereich 60 des Wellpappenformteiis schrittweise vom übrigen Bereich aus dünner wird, wie es in F i g. 2 gezeigt ist Diese Form des Wellpappenformteiis ist für die Ausnutzung der ursprünglichen Steifigkeit einer Wellpappenplatte zweckmäßig, weil diese nur über eine relativ kleine Fläche zusammengedrückt wird. Der stufenweise verringerte Bereich 54a des Zwischenraums 54 zwischen Matrize 46 und Patrize 48 bildet eine stumpfe Kante 62 zwischen dem gebogenen Bereich und dem übrigen Bereich des Wellpappenformteiis. Aus diesem Grunde sollte die abgestufte Oberfläche an dem Formteil von Matrize oder Patrize ausgebildet sein, das sich in Berührung mit der Fläche des Wellpappenformteils befindet, die abgedeckt ist, wenn das Wellpappenformteil montiert wird.The portion 54a of the gap 54 can be stepped, as shown at 50a, from the remaining area of the gap 54 can be reduced, so that the compressed and bent Area 60 of the corrugated cardboard molding gradually becomes thinner from the remaining area, as shown in FIG. 2 This shape of the corrugated cardboard molding is to take advantage of the original rigidity of a Corrugated board useful because it is only compressed over a relatively small area. Of the stepwise reduced area 54a of the space 54 between die 46 and die 48 forms a blunt edge 62 between the curved area and the remaining area of the corrugated cardboard molding. the end for this reason, the stepped surface should be formed on the molded part of the female mold or male mold is in contact with the surface of the corrugated cardboard molding which is covered when the corrugated cardboard molding is mounted.
Vorzugsweise wird der Abstund im Bereich 54a de.» Zwischenraums 54 aber kontinuierlich von dem übrigen Bereich des Zwischenraums 54 aus verringert, wie es in Fig. 1 durch eine strichpunktierte Linie angedeutet ist Außerdem kann der Bereich 54a verringerten Abstands und dementsprechend der zusammengedrückte und gebogene Bereich 60 des sich ergebenden Wellpappenformteils über die gesamte Fläche der Bereiche gleichmäßig groß bzw. dick oder in Abhängigkeit "on den Krümmungsradien der gebogenen Querschnitte der Bereiche kontinuierlich größer oder kleiner bzw. dicker oder dünner werden.The distance is preferably in the area 54a de. » Gap 54 but continuously decreased from the remaining area of the gap 54, as shown in FIG Fig. 1 is indicated by a dash-dotted line In addition, the area 54a can be reduced in distance and, accordingly, the compressed and curved area 60 of the resulting corrugated cardboard molding over the entire surface of the areas uniformly large or thick or depending on the radii of curvature of the curved cross-sections of the Areas continuously become larger or smaller or thicker or thinner.
Untersuchungen haben gezeigt daß die Dicke des zusammengedrückten und gebogenen Bereiches 60 eines Wellpappenformteiis im Bereich von ungefähr V9 bis ungefähr V9 der Dicke des übrigen Bereiches liegen sollte. Der Zwischenraum der Presse sollte deshalb so bemessen *.ein, daß der Abstand /1 im Bereich 54a ungefähr V9 bis ungefähr V9 des Absujides h im übrigen Bereich (54) des Zwischenraums beträgt Wenn also der zu Beginn flache Rohling, aus dem ein gebogenes Wellpappenformteil hergestellt werden soll, 5 mm aick ist, und wenn beispielsweise der Abstand h des Zwischenraums 54 4,5 mm beträgt dann kann der Abstand h des Bereichs 54a verringerter Dicke des Zwischenraums 54 im Bereich von ungefähr 0,5 mm bis· ungefähr 2,5 mm liegen. Nach einer besonders zweckmäßigen Ausführungsform beträgt die Dicke des zusammengedrückten und gebogenen Bereiches 60 eines herzustellenden Wellpappenformteils ungefähr V3 der Dicke des übrigen Bereiches. Der Abstand 1\ des Bereiches 54a verringerter Dicke des Zwischenraums 54 der Presse sollte deshalb in Abhängigkeit vom Abstand h des übrigen Bereiches des Zwischenraums 54 festgelegt werden.Investigations have shown that the thickness of the compressed and bent area 60 of a corrugated cardboard molding should be in the range from about V 9 to about V 9 the thickness of the remaining area. The gap between the press should therefore be dimensioned in such a way that the distance / 1 in the area 54a is approximately V 9 to approximately V 9 of the Absujides h in the remaining area (54) of the gap curved corrugated cardboard molding is to be produced, is 5 mm thick, and if, for example, the distance h of the gap 54 is 4.5 mm, then the distance h of the region 54a of reduced thickness of the gap 54 can be in the range from approximately 0.5 mm to approximately 2 , 5 mm. According to a particularly expedient embodiment, the thickness of the compressed and bent area 60 of a molded corrugated cardboard part to be produced is approximately V 3 the thickness of the remaining area. The distance 1 \ of the area 54a of reduced thickness of the gap 54 of the press should therefore be determined as a function of the distance h of the remaining area of the gap 54.
Das Verfahren läßt sich auch bei Weüpappenplatten mit zwei oder mehr gewellten Zwischenschichten anwenden.The method can also be used with Weüpappen boards with two or more corrugated intermediate layers use.
Hierzu 1 Blatt Zeichnungen1 sheet of drawings
Claims (5)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8236876A JPS537882A (en) | 1976-07-09 | 1976-07-09 | Process and apparatus of molding corrugated cardboard |
Publications (2)
Publication Number | Publication Date |
---|---|
DE2730997A1 DE2730997A1 (en) | 1978-01-12 |
DE2730997C2 true DE2730997C2 (en) | 1982-07-22 |
Family
ID=13772632
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE2730997A Expired DE2730997C2 (en) | 1976-07-09 | 1977-07-08 | Corrugated cardboard structure |
Country Status (5)
Country | Link |
---|---|
JP (1) | JPS537882A (en) |
AU (1) | AU503583B1 (en) |
DE (1) | DE2730997C2 (en) |
FR (1) | FR2357366A1 (en) |
GB (1) | GB1576142A (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4163380A (en) * | 1977-10-11 | 1979-08-07 | Lockheed Corporation | Forming of preconsolidated metal matrix composites |
IT1298449B1 (en) * | 1998-02-25 | 2000-01-10 | Donati Coibentazioni S R L | STRUCTURAL SANDWICH PANEL FOR WALLS AND ROOFS WITH HIGH STRENGTH, AND PROCEDURE FOR ITS PRODUCTION. |
JP2003528999A (en) * | 1999-07-29 | 2003-09-30 | ドナティ グループ エッセ・ピィ・アー | Method of manufacturing construction sandwich panel for high strength wall and cover assembly |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2422998A (en) * | 1945-07-31 | 1947-06-24 | Old King Cole Inc | Method of making laminated corrugated articles |
-
1976
- 1976-07-09 JP JP8236876A patent/JPS537882A/en active Granted
-
1977
- 1977-06-22 AU AU26340/77A patent/AU503583B1/en not_active Expired
- 1977-06-23 FR FR7719320A patent/FR2357366A1/en active Granted
- 1977-06-28 GB GB27033/77A patent/GB1576142A/en not_active Expired
- 1977-07-08 DE DE2730997A patent/DE2730997C2/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
JPS5523534B2 (en) | 1980-06-24 |
JPS537882A (en) | 1978-01-24 |
FR2357366A1 (en) | 1978-02-03 |
FR2357366B1 (en) | 1981-05-29 |
GB1576142A (en) | 1980-10-01 |
AU503583B1 (en) | 1979-09-13 |
DE2730997A1 (en) | 1978-01-12 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
OAR | Request for search filed | ||
OC | Search report available | ||
OD | Request for examination | ||
OF | Willingness to grant licences before publication of examined application | ||
D2 | Grant after examination | ||
8325 | Change of the main classification |
Ipc: B32B 3/28 |
|
8326 | Change of the secondary classification |
Ipc: B32B 31/20 |