EP0853535A1 - Blank for manufacturing a laminated plate or a laminated beam plate - Google Patents

Blank for manufacturing a laminated plate or a laminated beam plate

Info

Publication number
EP0853535A1
EP0853535A1 EP96931085A EP96931085A EP0853535A1 EP 0853535 A1 EP0853535 A1 EP 0853535A1 EP 96931085 A EP96931085 A EP 96931085A EP 96931085 A EP96931085 A EP 96931085A EP 0853535 A1 EP0853535 A1 EP 0853535A1
Authority
EP
European Patent Office
Prior art keywords
surface section
section
laminated
blank
planear
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Withdrawn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
EP96931085A
Other languages
German (de)
French (fr)
Inventor
Risto Heikki Pitkänen
Jorma Tapani Fagerroos
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
Publication of EP0853535A1 publication Critical patent/EP0853535A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27M—WORKING OF WOOD NOT PROVIDED FOR IN SUBCLASSES B27B - B27L; MANUFACTURE OF SPECIFIC WOODEN ARTICLES
    • B27M3/00—Manufacture or reconditioning of specific semi-finished or finished articles
    • B27M3/0013—Manufacture or reconditioning of specific semi-finished or finished articles of composite or compound articles
    • B27M3/0066—Manufacture or reconditioning of specific semi-finished or finished articles of composite or compound articles characterised by tongue and groove or tap hole connections
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27M—WORKING OF WOOD NOT PROVIDED FOR IN SUBCLASSES B27B - B27L; MANUFACTURE OF SPECIFIC WOODEN ARTICLES
    • B27M3/00—Manufacture or reconditioning of specific semi-finished or finished articles
    • B27M3/0013—Manufacture or reconditioning of specific semi-finished or finished articles of composite or compound articles
    • B27M3/0026—Manufacture or reconditioning of specific semi-finished or finished articles of composite or compound articles characterised by oblong elements connected laterally
    • B27M3/0053—Manufacture or reconditioning of specific semi-finished or finished articles of composite or compound articles characterised by oblong elements connected laterally using glue

Definitions

  • the invention relates to a blank comprising an elongated piece of wood with a specific shape, having two planear lateral surface sections and an upper surface section and a lower surface section connecting these. These blanks are used to manufacture laminated beam plates, which may be further used for the manufacture of laminated plates or laminated beams or other products.
  • laminated plates are manufactured of batten strips sawn out of an approx. 45 mm thick batten, by gluing the strips with a "friction press". Though less frequently, laminated plates can also be made by slicing laminated beams vertically by means of a deal bandsaw.
  • Laminated beams and plates are usually made of logs, which are expensive compared to small-dimensioned wood. What is more, the log consumption will be high when laminated beams and plates are manufactured with the methods described above.
  • the cubic metre log consumption for each product mentioned above is calculated as follows:
  • the object ofthe invention is to provide a blank which can be manufactured from less expensive small-dimensioned wood and has a profile allowing small- dimensioned wood to be very effectively used, and also allows laminated beam plates with excellent strength properties to be manufactured.
  • the blank in accordance with the invention is advantageously made of small- dimensioned wood, which costs about one third ofthe price of logs.
  • the blank in accordance with the invention is made by working small-dimensioned wood such that it directly adopts its final shape, resulting in a very high yield.
  • the lower surface section mentioned above is preferably planear, and then small- wood core cleaving and sursurface profiling result in two blanks in accordance with the invention.
  • small-dimensioned wood is split to the core by exactly positioning the small-dimensioned wood with the aid ofa tracer such that the core is hit by the saw-slit, using for instance a log sawband. and by profiling the halves with a machine provided with two upper horizontal spindles. The reason for this is that the timber core is by no means located in the centre ofthe cross-sectional sursurface.
  • the lateral sursurface sections mentioned above are preferably mutually parallel and also in right angles to said lower sursurface section.
  • figure 1 A is a cross-sectional view of a blank in accordance with the invention
  • figure IB is a view of the same structure as in figure 1 A, provided with dimension marks
  • figure 2 is a cross-sectional view of small-dimensioned wood, in which the splitting and profiling lines have been marked
  • figure 3 is a view of a laminated beam plate made of blanks in accordance with the invention.
  • the blank 1 ofthe invention is an elongated, e.g. 3 m long wooden piece with a given shape, which has been made of small- dimensioned wood.
  • This blank 1 has a planear lower surface section 4 and two mutually parallel planear lateral surface sections 2 and 3, which are in right angles to the lower surface section, and an upper surface section.
  • This upper surface section comprises an elongated, ridge-shaped tip section 5. Between the left lateral surface section 2 and the tip section 5 there is a first planear surface section 6 to be glued, and a second planear surface section 7 to be glued, the surface sections 6 and 7 being connected by a planear intermediate surface section 8. Accordingly, between the right lateral surface section 3 and the tip section 5, there is a first planear surface section 9 to be glued and a second planear surface section 10 to be glued, the surface sections 9 and 10 being connected by a planear intermediate surface section 1 1.
  • the blank in accordance with the invention meets the following conditions
  • angles ⁇ and ⁇ are approx. 90 °.
  • Figure 2 shows a cross-section of small-dimensioned wood 13. from which the blanks 1 of the invention are made for instance by using a profiling chipping canter.
  • the consumption of circular small-dimensioned wood is only approx. 1.5 m 3 per cubic metre of plate
  • conventional laminated plate manufacture requires approx. 4.6 m 3 of logs
  • conventional laminate beam manufacture requires approx. 3.5 m 3 of logs per 1 m 3 of product.
  • the price of small-dimensioned wood is only about one third ofthe price of logs.
  • the grain pattern on the sursurface of the laminated beam plate manufactured from blanks ofthe invention will meet current requirements in the market in that the growth rings will be pe ⁇ endicular to the sursurface.
  • small-dimensioned wood with an adequate diametre is used for the plate thickness concerned, the plates will result in mutually identical, homogenous products, and this is not one of the best features of a laminated plate manufactured with conventional methods.
  • This plate is perfectly suitable as a laminated beam owing to its glued, symmetrical structure. Such a structure does not warp, which is often the case with conventional laminated beam structures.
  • the blank ofthe invention enables a very economical laminated beam plate to be made from small-dimensioned wood by using straightforward means and methods as follows:
  • the blanks may be finger-jointed before planing.
  • laminated plates and laminated beams can be manufactured from a laminated beam plate made from blanks in accordance with the invention by sawing longitudinally.
  • building log blanks, window blanks, or similar blanks for the most varying purposes can be obtained from the laminated beam plate by sawing longitudinally, and decorative end grain patterns for instance for a floor board can be obtained by sawing transversely.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)

Abstract

The invention relates to a blank for laminated beam plates, comprising an elongated piece of wood with a specific shape, including two planear lateral surface sections (2, 3) and a lower surface section (4) and an upper surface section connecting these. Said upper surface section comprises an elongated, ridge-shaped tip section (5), and, between each lateral surface section (2, 3) and the tip section (5), a first planar surface section (6; 9) to be glued and a second planar surface section (7; 10) to be glued and a planar intermediate surface section (8; 11) connecting these. Said first surface section (6; 9) and said second surface section (7; 10) are mutually parallel and the width a of said first surface section (6; 9) is equal to the width b of said second surface section (7; 10) and the width c of the intermediate surface section (8; 11) is half of the width a or b. In addition, the angle α between the intermediate surface section (8; 11) and said second surface section (7; 10) is equal to the angle of opening β of the ridge-shaped tip section (5), which is preferably in the range of 90 to 135°.

Description

Blank for manufacturing a laminated plate or a laminated beam plate
The invention relates to a blank comprising an elongated piece of wood with a specific shape, having two planear lateral surface sections and an upper surface section and a lower surface section connecting these. These blanks are used to manufacture laminated beam plates, which may be further used for the manufacture of laminated plates or laminated beams or other products.
It is previously known to produce laminated beams from strength-graded pieces of wood rectangular in cross-section, which have been sawn from logs, yielding an overall quality higher than the average and suitable for the manufacture of a laminated beam. Usually such pieces of wood are glued by means of a beam press after drying. When manufacturing laminated beams, they are worked all over after gluing. A laminated beam produced in this manner is not appropriate for all purposes of use and tends to warp.
As a rule, so-called laminated plates are manufactured of batten strips sawn out of an approx. 45 mm thick batten, by gluing the strips with a "friction press". Though less frequently, laminated plates can also be made by slicing laminated beams vertically by means of a deal bandsaw.
Laminated beams and plates are usually made of logs, which are expensive compared to small-dimensioned wood. What is more, the log consumption will be high when laminated beams and plates are manufactured with the methods described above. The cubic metre log consumption for each product mentioned above is calculated as follows:
- a minimum of 2 m3 of logs per 1 m3 of sawn timber, - a minimum of 1.75 m3 of sawn timber, i.e. a minimum of 3.5 m3 of logs per 1 m3 of laminated beam,
- a minimum of 2.3 m3 of sawn timber, i.e. a minimum o 4.6 3 of logs per 1 m3 of laminated plate.
One should also take account of the fact that the entire sawn timber yield from logs will not be appropriate for the manufacture of a laminated beam, nor for the manufacture of a laminated plate. The object ofthe invention is to provide a blank which can be manufactured from less expensive small-dimensioned wood and has a profile allowing small- dimensioned wood to be very effectively used, and also allows laminated beam plates with excellent strength properties to be manufactured.
These objects have been achieved with a blank in accordance with the invention. whose main characteristics are defined in the characterising clause of accompanying claim 1.
The blank in accordance with the invention is advantageously made of small- dimensioned wood, which costs about one third ofthe price of logs. The blank in accordance with the invention is made by working small-dimensioned wood such that it directly adopts its final shape, resulting in a very high yield.
The lower surface section mentioned above is preferably planear, and then small- wood core cleaving and sursurface profiling result in two blanks in accordance with the invention. In fact, to operate with great accuracy, small-dimensioned wood is split to the core by exactly positioning the small-dimensioned wood with the aid ofa tracer such that the core is hit by the saw-slit, using for instance a log sawband. and by profiling the halves with a machine provided with two upper horizontal spindles. The reason for this is that the timber core is by no means located in the centre ofthe cross-sectional sursurface.
The lateral sursurface sections mentioned above are preferably mutually parallel and also in right angles to said lower sursurface section.
The invention will be described in greater detail below, with reference to the accompanying drawing, in which
figure 1 A is a cross-sectional view of a blank in accordance with the invention, figure IB is a view of the same structure as in figure 1 A, provided with dimension marks, figure 2 is a cross-sectional view of small-dimensioned wood, in which the splitting and profiling lines have been marked, and figure 3 is a view of a laminated beam plate made of blanks in accordance with the invention. Referring to figures 1 A and IB, the blank 1 ofthe invention is an elongated, e.g. 3 m long wooden piece with a given shape, which has been made of small- dimensioned wood. This blank 1 has a planear lower surface section 4 and two mutually parallel planear lateral surface sections 2 and 3, which are in right angles to the lower surface section, and an upper surface section. This upper surface section comprises an elongated, ridge-shaped tip section 5. Between the left lateral surface section 2 and the tip section 5 there is a first planear surface section 6 to be glued, and a second planear surface section 7 to be glued, the surface sections 6 and 7 being connected by a planear intermediate surface section 8. Accordingly, between the right lateral surface section 3 and the tip section 5, there is a first planear surface section 9 to be glued and a second planear surface section 10 to be glued, the surface sections 9 and 10 being connected by a planear intermediate surface section 1 1.
The blank in accordance with the invention meets the following conditions
- the width a ofthe first surface section 6 (and 9) = the width b of the second surface section 7 (and 10),
- the width c ofthe intermediate surface section 8 (and 1 1 ) = l/2a = l/2b and - the angle α between the intermediate surface section 8 (or 1 1 ) and the second surface section 7 (or 10) = the angle of opening β of the tip section.
In the example illustrated in figures IA and IB, the angles α and β are approx. 90 °.
Figure 2 shows a cross-section of small-dimensioned wood 13. from which the blanks 1 of the invention are made for instance by using a profiling chipping canter.
After drying, these blanks 1. turned to surface each other, are glued by means of a hotizontal press, forming a laminated beam plate 12. whose structure is illustrated in figure 3.
In accordance with the invention. the consumption of circular small-dimensioned wood is only approx. 1.5 m3 per cubic metre of plate, whereas conventional laminated plate manufacture requires approx. 4.6 m3 of logs and conventional laminate beam manufacture requires approx. 3.5 m3 of logs per 1 m3 of product. Moreover, the price of small-dimensioned wood is only about one third ofthe price of logs. The grain pattern on the sursurface of the laminated beam plate manufactured from blanks ofthe invention will meet current requirements in the market in that the growth rings will be peφendicular to the sursurface. When small-dimensioned wood with an adequate diametre is used for the plate thickness concerned, the plates will result in mutually identical, homogenous products, and this is not one of the best features of a laminated plate manufactured with conventional methods.
This plate is perfectly suitable as a laminated beam owing to its glued, symmetrical structure. Such a structure does not warp, which is often the case with conventional laminated beam structures.
The blank ofthe invention enables a very economical laminated beam plate to be made from small-dimensioned wood by using straightforward means and methods as follows:
1. Splitting the small-wood core and surface profiling with a suitable machine.
2. Piling the plate blanks as a drying plant load and subsequent drying. In doing this, a longitudinal through-drying plant or a high-frequency vacuum drying plant are usable.
3. Planing the blank to measure and gluing in connection with the planing. To manufacture a long plate, the blanks may be finger-jointed before planing.
4. Piling the blanks provided with glue at the input end of a gluing press and gluing the blanks.
Because wood dries and shrinks simultaneously over its entire cross-sectional surface in high-frequency drying, it is possible to anticipate the shrinkage. This allows the blanks to be provided with glue while fresh and the high-frequency vacuum dryer plant to be equipped with a press.
As explained above, laminated plates and laminated beams can be manufactured from a laminated beam plate made from blanks in accordance with the invention by sawing longitudinally. In addition, building log blanks, window blanks, or similar blanks for the most varying purposes can be obtained from the laminated beam plate by sawing longitudinally, and decorative end grain patterns for instance for a floor board can be obtained by sawing transversely.

Claims

Claims
1. A blank ( 1 ) for a laminated beam plate ( 12) comprising an elongated piece of wood with a specific shape, including two planear lateral surface sections (2, 3) and a lower surface section (4) and an upper surface section connecting these, characterised in that said upper surface section comprises an elongated, ridge- shaped tip section (5), and between each lateral surface section (2, 3) and tip section (5), a first planear surface section (6; 9) to be glued and a second planear surface section (7; 10) to be glued and a planear intermediate surface section (8: 1 1 ) connecting these, in that said first surface section (6; 9) and said second surface section (7: 10) are mutually parallel, in that said first surface section (6; 9) has a width a equal to the width b of said second surface section (7; 10) and that the width c of the intermediate surface section (8; 1 1 ) is half of the width a or b, and in that the angle ot between the intermediate surface section (8J 1 ) and said second surface section (7: 10) is equal to the angle of opening β of the ridge-shaped tip section (5).
2. A blank as claimed in claim 1. characterised in that angles ot and β are approx. in the range of 90 to 135 °.
3. A blank as claimed in claim 1 or 2. characterised in that the lower surface section (4) is planear.
4. A blank as claimed in any ofthe preceding claims, characterised in that the lateral surface sections (2. 3) are mutually parallel.
5. A blank as claimed in claim 4. characterised in that the lateral surface sections (2, 3) are in right angles to the lower surface section (4).
EP96931085A 1995-09-21 1996-09-20 Blank for manufacturing a laminated plate or a laminated beam plate Withdrawn EP0853535A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FI950409U FI2181U1 (en) 1995-09-21 1995-09-21 Aemne Foer framstaellning av en lim- och limbalksskiva
FI950409U 1995-09-21
PCT/FI1996/000500 WO1997010934A1 (en) 1995-09-21 1996-09-20 Blank for manufacturing a laminated plate or a laminated beam plate

Publications (1)

Publication Number Publication Date
EP0853535A1 true EP0853535A1 (en) 1998-07-22

Family

ID=8542628

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96931085A Withdrawn EP0853535A1 (en) 1995-09-21 1996-09-20 Blank for manufacturing a laminated plate or a laminated beam plate

Country Status (6)

Country Link
EP (1) EP0853535A1 (en)
AU (1) AU6990196A (en)
FI (1) FI2181U1 (en)
PL (1) PL325976A1 (en)
SK (1) SK36598A3 (en)
WO (1) WO1997010934A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5870876A (en) * 1997-02-24 1999-02-16 Synergy Wood Processing Inc. Converted wood articles, composite wood products made therefrom and method of making same
SE511577C2 (en) * 1997-03-19 1999-10-25 Aelvsbyhus Ab Process for the manufacture of elongated articles and articles made according to the procedure
SI24604A (en) * 2014-01-08 2015-07-31 Ggp, Gozdno Gospodarstvo Postojna, D.O.O. Improved carrying structure

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE118229C1 (en) *
DE2159337A1 (en) * 1971-11-30 1973-06-07 Albert Rufle METHOD AND DEVICE FOR MANUFACTURING SAW WOOD
DE2424517A1 (en) * 1974-05-20 1975-11-27 Otto Kreibaum Wooden profile constructed of log slices - interlocking Z-type sections cut out to facilitate joining
DE2938062C2 (en) * 1979-09-20 1983-07-21 Otto 3216 Salzhemmendorf Kreibaum Sen. Wooden construction element which is composed of round wood side sections that are essentially milled in a trapezoidal cross-section
DE2947611C2 (en) * 1979-11-26 1984-01-19 Kurt Ing.(grad.) 8625 Sonnefeld Feyler Process for the production of board lamellas

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9710934A1 *

Also Published As

Publication number Publication date
SK36598A3 (en) 1998-09-09
AU6990196A (en) 1997-04-09
FIU950409U0 (en) 1995-09-21
FI2181U1 (en) 1995-11-17
PL325976A1 (en) 1998-08-17
WO1997010934A1 (en) 1997-03-27

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