FI100780B - Method for making a glulam board - Google Patents

Description

100780

Method of making a glulam board - Förfarande för framställning av en lim-mad träskiva

The invention relates to a method for producing a glulam board, in which method 5 shaped wood blanks are dried at an elevated temperature in a dryer, optionally intermediate processed, and glued, stacked in the form of a board and pressed to form a glulam board.

It is known to make glued beams from supported sawn, strength-graded and rectangular pieces of timber, which are of better quality than the average of the 10 falling total yields and are suitable for the manufacture of glued beams. These pieces of timber are normally dried and taken to an intermediate storage, from where they are then taken to gluing, where they are glued with a beam press. The gluing times are in the order of about an hour, depending on the glue used. Such adhesive beams can, although less frequently, be made into high-edge adhesive sheets by slicing with a splitting rim-15 saw.

However, adhesive boards are mainly made of sawn strips about 45 mm thick from the edges by gluing the so-called friction clamps.

The object of the invention is to provide a method for producing a glulam board, in which gluing times can be considerably shortened. It is a particular object of the invention to provide a method in which glulam panels can be made from fresh fibrous wood efficiently and rapidly without intermediate storage, thereby providing a mouth; '; savings, e.g. investments.

These objects have been achieved by the method according to the invention, the main features of which are set out in the appended claims.

The invention therefore relates to a method for producing a glulam board, in which method certain shaped wood blanks are dried at an elevated temperature in a dryer; . · # Possibly intermediate, and glued, stacked into a plate shape and pressed • · * !. to form a glulam board, which method is characterized in that said \. the post-drying steps are performed with a substantially drying temperature of the wood.

Depending on the kiln used, the temperature of the kiln-temperature timber is typically about 30-90 ° C, preferably about 40-80 ° C.

100780 2

The method according to the invention may further comprise the step of gluing and pressing two or more glulam boards which are warm as a result of the drying step to form a multiplier board. Such a multiplier plate may, for example, comprise two or three base plates.

The invention is based on the realization that the post-drying operations are carried out immediately after the drying step on the goods at the temperature of the dryer, whereby the gluing times fall by a fraction compared to normal, cold-glued beams. At normal temperature, the gluing times are in the order of about an hour, depending on the glue used, while the gluing time with 50 ° C warm wood using phenol-resorcinol or 10 colorless melamine glue, e.g. Melurit M90, is only about 7 minutes. This means big savings already in investment. According to the invention, drying, intermediate processing and gluing are immediately connected together.

Wood blanks can have a shape similar to that disclosed in the U1 utility model application U950409, but wood blanks in other shapes can also be considered.

The invention will now be described in more detail with reference to the accompanying drawing, which schematically shows the various steps of the method according to the invention.

In stage I, the fresh fibrous wood 1, which may be small wood or log wood, is split, for example, with a log band saw, after which the halves are profiled with a machine 2 with two horizontal spindles above.

In step II, the profiled blanks 3 are loaded into a stack according to the diagram, which stack is then conveyed transversely past a sufficient number of drying units, e.g. in a longitudinal blast dryer 4.

• · · · • 1 '···' · Immediately after step II, step ΠΙ follows, in which the ends of the first dried blanks: 5: and then the blanks are finished planed 6 hot to the final profile 25.

Immediately after step III, step IV follows, in which the blanks are glued 7 and stacked. . the profiles are turned upside down to give two-layer stacks 8, • ·: ;;. which are placed on glossy sheets, possibly as a spatula of several sheets, after which the '·' stack or stack is then pressed in the appropriate stack press for a sufficient time 30 to glue the individual sheets. Such presses are in particular plywood •; · ·! cold presses known in the industry.

3 100780

If desired, the sheet 9 made as described above can be made into multiple thicknesses, in which case the individual sheets - still warm - are calibrated and, after the application of the adhesive, they are pressed into multiple sheets with the same pink press. From the base plates or multiplier plates, beams etc. can be obtained for various purposes by cutting, for example, with a multi-blade saw-5 la.

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Claims (4)

4,100780 A method for producing a glulam board, wherein the shaped wood blanks are dried at an elevated temperature in a kiln, optionally intermediate, and fortified, stacked and pressed to form a glulam board 5, characterized in that said post-drying steps are performed with substantially kiln temperature wood. A method according to claim 1, characterized in that the temperature of the wood at the drying temperature is about 30-90 ° C. 10 Process according to Claim 1 or 2, characterized in that the temperature of the wood at the drying temperature is approximately 40 to 80 ° C. A method according to any one of the preceding claims, characterized in that it further comprises the step of solidifying and pressing two or more glulam boards which are warm as a result of the drying step to form a multiple board. f r ,, 20 1. Förfarande för framställning av en limmad träskiva, vid vilket förfarande trä- '; the best of all forms in the form of a temperature and a maximum of one or more of the following forms: the upper part of the form of the tongue and the like, the first sentence contains a maximum temperature. 25 • · • · « 2. A method according to claim 1, which comprises a temperature of about 30 to 90 ° C. • · • · · • · · o : **: 3. A preferred embodiment of claims 1 or 2, having a temperature of 30 degrees at a temperature of about 40-80 ° C. 4. · · • · • 4. For the purpose of applying the provisions of the patent law, for the purpose of determining whether or not there is an override, for example, for the purpose of multi-image printing. skiva.