EP0194238B1 - A process for forming floor boards on a plywood base and a board thus realized - Google Patents
A process for forming floor boards on a plywood base and a board thus realized Download PDFInfo
- Publication number
- EP0194238B1 EP0194238B1 EP86830050A EP86830050A EP0194238B1 EP 0194238 B1 EP0194238 B1 EP 0194238B1 EP 86830050 A EP86830050 A EP 86830050A EP 86830050 A EP86830050 A EP 86830050A EP 0194238 B1 EP0194238 B1 EP 0194238B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- layer
- board
- valuable
- fibres
- plywood
- 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 - Lifetime
Links
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
- E04F15/00—Flooring
- E04F15/02—Flooring or floor layers composed of a number of similar elements
- E04F15/04—Flooring or floor layers composed of a number of similar elements only of wood or with a top layer of wood, e.g. with wooden or metal connecting members
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
- E04F2201/00—Joining sheets or plates or panels
- E04F2201/04—Other details of tongues or grooves
- E04F2201/043—Other details of tongues or grooves with tongues and grooves being formed by projecting or recessed parts of the panel layers
Definitions
- the invention refers to a development of Italian prior patent No. 9456 A/84 filed by the same inventor on 11 July 1984.
- a board for wooden floors is made up of an upper layer with viewable face, mostly of valuable wood, matched with a lower layer having a plywood construction and thus with sheets having the fibres pattern both orthogonal and parallel to that of the valuable layer;
- the valuable layer _ intended to form the viewable face _ has a longitudinal fibres pattern and the lower plywood layer has transverse grooves being thus orthogonal to the fibres pattern of the upper layer.
- the support layer consists of a plywood structure whose external sheets have longitudinal fibers, parallel to those of the layer of prestige wood; it is understandable that in this condition both the layer of prestige wood and the top sheet of the support panel will deform in the same transverse direction with the result that the wood strip warps (where, by warping, the curving of the width of the strips is intended).
- this prejudical phenomenon may cause the strip of prestige wood to become convex, or alternatively, in a very humid environment, concave.
- the grooves were expected to improve the overall elasticity of this wooden strip with respect to possible excessive longitudinal strain.
- a panel disclosed in French patent No. 659803 is produced with a supporting composite structure on which a very thin sheet of covering is veneered whose fibres are orthogonal to those of the support panel itself.
- the lower layer has the fibres patterns of the external sheets on thicknesses perpendicular to those of the upper valuable layer and, therefore, parallel to the grooves.
- the lower plywood layer has five sheets or thicknesses, the intermediate thickness and the two external ones of said lower plywood layer having fibres being transverse in respect to those of the upper valuable layer.
- the lower plywood layer has the two outer thicknesses or sheets with a fibres pattern transverse in respect to that of the upper valuable layer, and the intermediate sheet _ single or double _ with a fibres pattern parallel to that of the upper valuable layer.
- the proposed solution is particularly suitable for boards being relatively wide in respect to their length.
- transverse grooves may be deeply cut to involve at least most of the thickness of the lower layer.
- the grooves may have a width of the order of a least 3 mm. and such a depth as never to penetrate the upper layer and not to indent the adhesive veil which unites the valuable wood board to the lower plywood layer.
- the side cogs and slots for the installation joint are formed in the lower plywood layer.
- a floor board is made up of an upper layer (21) of valuable wood and a lower layer (23) consisting of two external plywood sheets (23A, 23B) and two intermediate sheets (23C).
- the fibres pattern of the layer (21) and of the sheets (23C) is longitudinal, that is, lying in the direction fL of the board length; the fibres pattern of sheets (23A, 23B) is orientated in the transverse direction fT.
- transverse grooves (25) are cut out parallel to the direction fT and suitably spaced apart for the function already pointed out.
- the depth of the grooves does not go beyond the glueing surface (27) between 21 and 23B, and may also not go beyond the glueing surface (29) between 23B and 23C.
- the boards have rib projections (30) and channel recesses (32) _ shown only in Fig. 2 _ to form the joints.
- Both the projections,and the channels are formed from the layer (23).
- Fig. 2 shows a five-layer plywood, a central layer (23E) being interposed between the thicknesses or sheets (23C); the sheet or thickness (23E) has the fibres pattern parallel to that of thicknesses (23A and 23B).
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Floor Finish (AREA)
- Chemical And Physical Treatments For Wood And The Like (AREA)
- Finished Plywoods (AREA)
- Veneer Processing And Manufacture Of Plywood (AREA)
- Television Systems (AREA)
- Telephonic Communication Services (AREA)
- Collating Specific Patterns (AREA)
Abstract
Description
- The invention refers to a development of Italian prior patent No. 9456 A/84 filed by the same inventor on 11 July 1984.
- According to the prior patent, a board for wooden floors is made up of an upper layer with viewable face, mostly of valuable wood, matched with a lower layer having a plywood construction and thus with sheets having the fibres pattern both orthogonal and parallel to that of the valuable layer; the valuable layer _ intended to form the viewable face _ has a longitudinal fibres pattern and the lower plywood layer has transverse grooves being thus orthogonal to the fibres pattern of the upper layer.
- In the preferred embodiment of the prior invention patented with No. 9456 A./84, the support layer consists of a plywood structure whose external sheets have longitudinal fibers, parallel to those of the layer of prestige wood; it is understandable that in this condition both the layer of prestige wood and the top sheet of the support panel will deform in the same transverse direction with the result that the wood strip warps (where, by warping, the curving of the width of the strips is intended).
- It follows, that in the case of a particularly dry environment, this prejudical phenomenon may cause the strip of prestige wood to become convex, or alternatively, in a very humid environment, concave.
- The grooves were expected to improve the overall elasticity of this wooden strip with respect to possible excessive longitudinal strain.
- A panel disclosed in French patent No. 659803 is produced with a supporting composite structure on which a very thin sheet of covering is veneered whose fibres are orthogonal to those of the support panel itself.
- The parallel position of the fibres of the four sheets of this support layer, does not make the size of the support stable.
- According to the present invention, the lower layer has the fibres patterns of the external sheets on thicknesses perpendicular to those of the upper valuable layer and, therefore, parallel to the grooves.
- In a possible embodiment, the lower plywood layer has five sheets or thicknesses, the intermediate thickness and the two external ones of said lower plywood layer having fibres being transverse in respect to those of the upper valuable layer.
- According to another feasible embodiment, the lower plywood layer has the two outer thicknesses or sheets with a fibres pattern transverse in respect to that of the upper valuable layer, and the intermediate sheet _ single or double _ with a fibres pattern parallel to that of the upper valuable layer.
- The proposed solution is particularly suitable for boards being relatively wide in respect to their length.
- The above mentioned transverse grooves may be deeply cut to involve at least most of the thickness of the lower layer.
- More particularly, in the grooves may have a width of the order of a least 3 mm. and such a depth as never to penetrate the upper layer and not to indent the adhesive veil which unites the valuable wood board to the lower plywood layer.
- In case of boards having mounting joints, the side cogs and slots for the installation joint are formed in the lower plywood layer.
- The invention will be better understood by following the description and the attached drawing which shows a practical non-limitative exemplification of the same invention.
- In the drawing:
- Fig. 1 shows a perspective view of a board according to a first embodiment, with cutaway parts and without joints; and
- Fig. 2 shows a much enlarged and fragmentary cross section of a board according to a second embodiment, with a five-layer plywood.
- According to the drawing, a floor board is made up of an upper layer (21) of valuable wood and a lower layer (23) consisting of two external plywood sheets (23A, 23B) and two intermediate sheets (23C).
- The fibres pattern of the layer (21) and of the sheets (23C) is longitudinal, that is, lying in the direction fL of the board length; the fibres pattern of sheets (23A, 23B) is orientated in the transverse direction fT.
- In the drawing, the cross section taken on planes perpendicular to the fibres are conventionally squared and the cross-sections parallel to the fibres pattern show a wide, wavy hatching.
- In the plywood layer (23A, 23B, 23C, 23C), transverse grooves (25) are cut out parallel to the direction fT and suitably spaced apart for the function already pointed out.
- The depth of the grooves does not go beyond the glueing surface (27) between 21 and 23B, and may also not go beyond the glueing surface (29) between 23B and 23C.
- The boards have rib projections (30) and channel recesses (32) _ shown only in Fig. 2 _ to form the joints.
- Both the projections,and the channels are formed from the layer (23).
- Fig. 2 shows a five-layer plywood, a central layer (23E) being interposed between the thicknesses or sheets (23C); the sheet or thickness (23E) has the fibres pattern parallel to that of thicknesses (23A and 23B).
- The preparation of the above described material is similar to that point out in the above mentioned prior patent.
- It is understood that the drawing shows an exemplification given only as a practical demonstration of the invention, as this may vary in the forms and dispositions without departing from the scope of the idea on which the same invention is based, and as disclosed in the attached claims.
Claims (6)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT86830050T ATE64169T1 (en) | 1985-03-05 | 1986-03-04 | METHOD OF MANUFACTURE OF PLYWOOD BASED FLOORBOARDS AND BOARD THUS MANUFACTURED. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT09353/85A IT1201246B (en) | 1985-03-05 | 1985-03-05 | PROCEDURE FOR THE FORMATION OF FLOOR LISTS ON A PLYWOOD BASIS, AND LIST SO MADE |
IT935385 | 1985-03-05 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0194238A2 EP0194238A2 (en) | 1986-09-10 |
EP0194238A3 EP0194238A3 (en) | 1987-09-16 |
EP0194238B1 true EP0194238B1 (en) | 1991-06-05 |
Family
ID=11128873
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP86830050A Expired - Lifetime EP0194238B1 (en) | 1985-03-05 | 1986-03-04 | A process for forming floor boards on a plywood base and a board thus realized |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0194238B1 (en) |
AT (1) | ATE64169T1 (en) |
DE (1) | DE3679574D1 (en) |
IT (1) | IT1201246B (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4131640A1 (en) * | 1991-09-23 | 1993-04-01 | Hamberger Industriewerke Gmbh | Laminated floor panels which resist dampness distortion - comprises minimum of three layers of laminates, middle one being plywood with low swelling property when damp and one that resumes original shape when dry |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
IT207242Z2 (en) * | 1986-03-07 | 1988-01-04 | Giordano Guglielmo | A MANUFACTURE FOR FLOORING, CONSISTING OF WOOD ELEMENTS WITH ORTHOGONAL FIBER TO THE FACING VISTA AND ASSEMBLED WITH A Plywood Support |
IT242498Y1 (en) * | 1996-12-19 | 2001-06-14 | Margaritelli Italia Spa | FLOORING LISTONE CONSTITUTED BY A LIST IN PRECIOUS WOOD AND A SPECIAL MULTILAYER SUPPORT IN WHICH THE LAYERS PREVAL |
AT406596B (en) * | 1998-07-13 | 2000-06-26 | Erwin Ing Thoma | Prefabricated plywood element |
US7225591B2 (en) * | 2000-10-08 | 2007-06-05 | Hangzhou Dazhuang Floor Co., Ltd. | Flexible two-ply flooring system |
US7261947B2 (en) * | 2003-12-04 | 2007-08-28 | Awi Licensing Company | Plywood laminate having improved dimensional stability and resistance to warping and delamination |
CA2872041A1 (en) * | 2011-05-02 | 2012-11-08 | Michel-Arnaud D'ABBADIE D'ARRAST | Cross-laminated timber panel |
CN103978535B (en) * | 2014-05-16 | 2016-01-20 | 徐斌 | Processing has the technique of annual ring graphic pattern floor |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR659803A (en) * | 1928-08-31 | 1929-07-03 | Improvements to wooden panels for walls and floors | |
FR706274A (en) * | 1930-02-19 | 1931-06-20 | New elements of plywood parquet floors and device facilitating manufacture | |
CH154091A (en) * | 1931-04-20 | 1932-04-30 | Maury Alois | Element of parquet. |
FR890194A (en) * | 1943-01-18 | 1944-01-31 | construction element for parquet floors | |
GB628559A (en) * | 1946-07-01 | 1949-08-31 | Gustaf Kahr | Improved laminated floor boards and method of manufacturing same |
DE841633C (en) * | 1949-11-17 | 1952-06-16 | Kulmbacher Spinnerei | Process for the production of a floor covering |
CH328341A (en) * | 1954-07-05 | 1958-03-15 | Kristian Staerk A S | Profiled plywood sheet |
FR1480365A (en) * | 1966-03-31 | 1967-05-12 | Duchesne Ets | Parquet |
AT379845B (en) * | 1980-08-27 | 1986-03-10 | Tarkett Ab | PLATE OR ROD, IN PARTICULAR FOR FLOORS |
-
1985
- 1985-03-05 IT IT09353/85A patent/IT1201246B/en active
-
1986
- 1986-03-04 AT AT86830050T patent/ATE64169T1/en not_active IP Right Cessation
- 1986-03-04 EP EP86830050A patent/EP0194238B1/en not_active Expired - Lifetime
- 1986-03-04 DE DE8686830050T patent/DE3679574D1/en not_active Expired - Fee Related
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4131640A1 (en) * | 1991-09-23 | 1993-04-01 | Hamberger Industriewerke Gmbh | Laminated floor panels which resist dampness distortion - comprises minimum of three layers of laminates, middle one being plywood with low swelling property when damp and one that resumes original shape when dry |
Also Published As
Publication number | Publication date |
---|---|
DE3679574D1 (en) | 1991-07-11 |
ATE64169T1 (en) | 1991-06-15 |
EP0194238A3 (en) | 1987-09-16 |
EP0194238A2 (en) | 1986-09-10 |
IT8509353A0 (en) | 1985-03-05 |
IT1201246B (en) | 1989-01-27 |
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