FI97959B - Method and apparatus for joining at least two pieces of wood into one piece - Google Patents

Description

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_ F1000097959B

ΤΤΣ ^ ΓΓΙ (B) (11) NOTICE OF ADVERTISEMENT

UTLAGGNINGSSKRIFT 97959 (51) Kv.Ik.6 - Int.cl.6 B 276 11/00 _ (21) Patent application - PatentansSkning 953043

SUOMI FINLAND

(22) HakemispSivS - AnsSkningsdag 20.06.95 (^) (24) A1 kuplivX - LSpdag 20.06.95 (41) Has become public - Blivit offentlig 13.12.96

National Board of Patents and Registration (44) Date of publication and publication of the NShtXvXks. -

Patent and registration authorities Ansokan utlagd och utl.skriften publicerad 13.12.96 (71) Applicant - SSkande 1. JSrme Oy, Pajani emenkatu 3, 15700 Lahti, (FI) (72) Keksijl - Uppfinnare 1. Kallio, Pentti, Kotirannankatu 1. 15300 Lahti, (FI) (74) Agent - Ombudsman: Oy Heininen Ab (54) Invention designation - Uppfinningens benlmning

Method and apparatus for at least two pieces of wood into a single piece Förfarande och anordning f3r ), OK B 138879 (B 276 11/00), SE B 387066 (B 27G 11/00) (57) Summary - Sammandrag

Method for joining at least two pieces of wood (1, 2, 3) into one piece (8), in which method at least one of the joining surfaces (4, 5; 6, 7) is supplied with an adhesive (L), pieces (1, 2, 3) align the connecting surfaces (4, S; 6, 7) and press together. At least one of the pieces (1, 2; 2, 3) to be joined together in each joint is heated before the surfaces (4, 5; 6, 7) to be joined are placed opposite each other. The invention also relates to an apparatus implementing the method.

For example, it is used for the transmission of a trap (1,2,3) to the sticke (8), and for the application of the (L) applicators pA to the ninstone and to the rake (4,5; 6,7), bitrate ^ | (1,2,3) placeras med fogytorna (4,5; 6,7) mot T "1" ^ 5 varandra och presses same. Atninstone den ___ ^ ® ena av träbitarna (1,2,3,4) som bildar res- _v_ ^ 6 j> pektive fog upphettas innan atytytorna ^ T -— ΓΧ7 (4,5; 6,7) placeras Nitt för varandra . Uppfin- '' —-3 to the right of the order and real - - 1- to the farfarandet. a) b) 97959

a method and apparatus for joining at least two pieces of wood into ONE PIECE

The invention relates to a method according to the preamble of claim 1 for joining pieces of wood into one piece. The invention also relates to an apparatus according to claim 5 for joining pieces of wood into one piece.

10 In the manufacture of wood pieces (especially glulam beams), adhesive has traditionally been applied to at least one of the opposing surfaces / wherein the pieces to be joined are pressed and held in presses until the adhesive is sufficiently dry. Due to the long drying time, there is a need for large presses that can accommodate a large number of pieces to be pressed at one time.

The temperature has a significant effect on the drying time of the adhesive, in which case solutions have been developed in which the body to be glued is heated from the outside. Heating the body from the outside 20 has been difficult because wood is an insulating material. In addition, directing heat to the gluing point has been cumbersome and used. . solutions complex.

• · ·· · ** ♦ The object of the present invention is to provide a completely new method and apparatus which avoids the disadvantages of the prior art.

* · • · • · · ···. * * The method and apparatus according to the invention are characterized by what is stated in the claims.

.säo »» ·: The solution according to the invention has numerous significant advantages.

•

The method according to the invention has made it possible to accelerate the drying of the adhesive substantially substantially. In this case, a considerable *. significantly higher capacity than conventional methods.

• · · · 1 • »· · • · 2 97959

The invention will now be described with reference to the accompanying drawings, in which:

Figure 1 shows a simplified side view of a device applying the method according to the invention,

Figure 2 shows a top view of an apparatus applying the method according to the invention, Figure 3a shows the pieces to be joined before pressing, and Figure 3b shows the piece to be joined.

In the method according to the invention, at least two pieces of wood 1, 2, 3 are joined into one piece 8 by means of an adhesive L and a press 10. Typically, the method can be used, for example, in the production of glulam beams, lamella logs or multilayer boards. According to the method, an adhesive L, at least one of the pieces 1, 2 to be joined together in each joint, is introduced into at least one of the joint surfaces 4, 5, 6, 7; 2, ·· * ·: ·· ;: 3 is heated against each other before placing the surfaces to be joined ....

; *; $ * hand, after which the pieces are placed on the connecting surfaces 4, 5? 6, i. \ T 7 align and pressed together. Most preferably, at least one of the pieces to be joined at each joint is heated by radiation. Usually, an adhesive L is introduced into one of the joint surfaces 5, 7 of each joint and the other joint surface 4, 6 is heated by means of radiation, in particular infrared radiation.

·· ·· · • · «· **% · V. *. :::? 0 In a preferred embodiment of the method, wherein r # · ·» ... ·. the final piece 8 consists of more than “* 4 * two pieces of wood 1, 2, 3 adhesive L is imported ···.

on one surface 5 of the body 2, the body 2 is heated against *.

*: **: on the fireplace side 6, the pieces 1, 2, 3 are stacked, whereby the adhesive surface 7 of the adjacent pieces 2, 3 and the heated * j'JV · ν '97959 3 surface 6 are placed opposite each other and pressed together with a press 10. only the adhesive L is introduced into the forming body 3 and the upper surface forming body 1 is only heated. Both treatments are performed on the pieces 5 between these pieces 1, 3.

The apparatus according to the invention operates as follows in the manufacture of glulam beams. The planed pieces 2 coming through the glue 9 by the longitudinal conveyor 12 are turned by the turning device 10 13 the glue side 5 downwards onto the transverse conveyor 14 on the knuckles or the like, thus avoiding staining of the glue. The body 2 preferably moves in the transverse direction under the IR radiator 11, whereby the non-glued surface 6 undergoes the desired temperature. The IR radiator 11 is preferably substantially at least the length of the body to be heated. The piece 2 is turned and placed on the conveyor 15, preferably on the comb conveyor, on the combs 20 acting as separating means, whereby there is an air gap between the pieces 2, whereby the adhesive does not yet react. The pieces placed on the comb conveyor 15 form a * .20 stack, which, when desired, is transferred to the press 10, · .: In the case according to Fig. 1, the pieces are pushed into the press 10 by the processing ·; · members one by one, but they can be moved

• I

Ϊ *: also in a bundle in the press.

· # ·· • · φ m 0:) £ 5 In the case according to Fig. 3, in the joint surfaces the adhesive surface 5, * · * 7 is placed upwards and the heated surface 4, 6 is placed downwards.

. The pieces 1, 2, 3 are pressed together for the desired time. Efficient • direct-acting heating can significantly shorten compression times. The compression time can be: ·; * 30 in a conventional case reduced from 8-11 hours ♦ ·· i * to less than an hour. In this case, a temperature in the range of 40-90 ° C is usually used as the heating temperature. The compression time -: * en is substantially affected by the adhesive used and the thermal: **: state of the joint.

35 · - ·; ......- · · - - ·> · * · '·' '' j'.r'-Tri '' · '---- 1-.7 -..-.- -r ^ . ·· -. .-. -7 · - · '—.f, »* - 979 59 4

It will be clear to a person skilled in the art that the invention is not limited to the exemplary embodiments presented above, but can be varied within the scope of the appended claims.

♦ • · * ·· • · · 1 2 ·· ·· ···· ..1 M · • · · ·· «·· · • · • · • 0 •%» φ · • · * · » ·· · • ·· • · • m • \ • Φ · • ·· · Φ · Φ • · · ♦ · · • · r.

m ·· ** · · · · · m · · · * * 2 # · * ·· * · •·· * »·

Claims (6)

97959 A method for joining at least two pieces of wood (1, 2, 3) into one piece (8), the method comprising introducing an adhesive (L) into at least 5 of the joining surfaces (4, 5; 6, 7), the pieces (1, 2, 3 ) aligning and pressing the joint surfaces (4, 5; 6, 7) together, and in which at least one of the pieces (1, 2; 2, 3) to be joined together in each joint is heated before the surfaces (4, 5; 6, 7) to be joined are set. 10, characterized in that an adhesive (L) is introduced into one joint surface (5, 7) of each joint and the other joint surface (4, 6) is heated by radiation, in particular infrared radiation, and that the pieces are arranged in a press in such a way that the upper surface (4, 6) of each joint is heated and the adhesive (L) is introduced into the lower surface (5, 7). Method according to Claim 1, characterized in that in the method, an adhesive (L) is applied to at least one body (2) between the surface pieces (1, 3), one piece (2) of the body piece (2). heated \ on the opposite side (6), the pieces (1, 2, 3) are stacked so that the adhesive surface (L) * of the adjacent pieces (1, 2; 2, 3): and the heated surface is placed opposite and pressed. • · • · 1 ** 25 Method according to Claim 1 or 2, characterized in that the pieces (2) are turned downwards by the adhesive side (5) by means of a turning device (13) after application of the adhesive to the conveyor (14), the pieces (2) being transferred by IR. a radiator (11) for heating the non-glued surface (6) of each piece (2) [** 30] to the desired temperature, that after the heating step the pieces (2) are turned and placed on the conveyor (15), suitably: [* or on the comb conveyor, separating means (20), the pieces (2) placed on the comb conveyor (15) form a ladle V, which is transferred to the press (10), either individually or in a bundle. : 135 • · 97959 An apparatus for joining at least two pieces of wood (1/2, 3) into one piece (8), the apparatus comprising means (9) for applying the adhesive (L) to at least one of the hand-held pieces (1/2, 3), a radiant heating device (11) / for heating at least one of the surfaces (4, 5; 6, 7) to be joined together before juxtaposing the surfaces to be joined and means (10) for pressing the pieces (1, 2, 3) together, characterized by an adhesive application device (9) and a radiation a turning device (13) arranged between the heating device, and an apparatus (15) arranged downstream of the radiant heating device for turning and placing the pieces (2) in the press (10) in the press as a bundle to be pressed together. Apparatus according to claim 4, characterized in that the apparatus for turning and placing the pieces (2) in the press comprises a conveyor (15), preferably a comb conveyor, on which the pieces (2) are arranged on the combs (20) acting as separating members. * There is an air gap between 20. m »« ··. Apparatus according to Claim 4 or 5, characterized in that the comb conveyor (15) is connected to a ♦. ·. arranged handling means on the conveyor combs (20), ♦ 25 for pushing the arranged pile-forming pieces »· into the press (10) individually or in a bundle. • · »· f ·» # • * • · ·· ♦ ·· • · • ♦ • 9 9 9 9 9 9 9 * 9 7 97959