Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
  • B27G—ACCESSORY MACHINES OR APPARATUS FOR WORKING WOOD OR SIMILAR MATERIALS; TOOLS FOR WORKING WOOD OR SIMILAR MATERIALS; SAFETY DEVICES FOR WOOD WORKING MACHINES OR TOOLS
  • B27G1/00—Machines or devices for removing knots or other irregularities or for filling-up holes
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
  • B27B—SAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR
  • B27B1/00—Methods for subdividing trunks or logs essentially involving sawing
• • 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
  • B27M1/00—Working of wood not provided for in subclasses B27B - B27L, e.g. by stretching
  • B27M1/08—Working of wood not provided for in subclasses B27B - B27L, e.g. by stretching by multi-step processes
• • 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 present invention relates to a method for manufacturing edge-glued panels and laminated beams from 80-160 mm diameter logs each having been sawn into two 30-70 mm thick timber pieces with pronounced waney edges.
• the edges of the tree naturally have to be cut away. But because the slab edges of small diameter trees, inherently, are thin, the slabs cannot be cut further into square-edged members (contrary to the case for large diameter trees) . Yet the edge slabs comprise a large fraction of the small tree volume. This results in a yield of-> no more than about 40 % for small diameter logs, compared to approximately 50 % from normal logs.
• Edge-glued panels for furniture applications are generally made from square edged members according to the method shown in fig 1. Small diameter trees, by virtue of having-> tight sound knots, make a good material for edge-glued panels for furniture. However the volume fraction of square edged members that may be extracted from a small diameter log is small compared to the total log volume; the yield is low. For example, from a log with a 14.6 cm small end diameter (before drying), only two pieces with-> dimension 50 x 92 [mm] (after drying) may be obtained. From these, 18 mm thick panels may be manufactured, built out of 8 members (4 members from each piece) with the dimensions 18 x 44 [mm] .
• the panel surfaces consist of alternating narrow bands of sapwood and wide bands of heartwood, which does not give the surfaces a pleasing overall appearance. And second, this method gives comparably thick panels (thicker than about 35 mm) that are not applicable for most
• the PrimWood method is a radial sawing method with high yield.
• radial sawing methods are not suitable for processing small diameter trees with densely spaced knots. This is
• This invention may use sawn timber obtained by plane sawing, having infrequent spike knots and also being cheaper
• the main object of the present invention is to provide a method for making edge-glued laminated panels or laminated beams from sawn timber with wane. Another object is to obtain a high yield from small diameter logs cut by conventional plane sawing. 95-> Yet another object is to produce panels with a quality surface suitable for furniture and interior furnishing. A fourth object is to provide edge-glued panels with approximately equal distances between the glue lines of the joints. A fifth object is to improve the processing of the edge profile, and the aligning and locking of ⁇ oo-> the members to each other.
• the process according to the present invention consists of two main processing parts.
• the first part of this process is illustrated in fig 3.
• the starting material is sawn timber pieces (2) having a wane on both edges.
• the method of sawing the original log is not relevant for this invention, but typically it has been i90-> plain sawn as indicated in the figure.
• the edges are i95-> machined to a profile (f) .
• members (3) may be joined to pieces (7) .
• the members (3) are cut into smaller members such as (4), or (5) and (6).
• This process step of the present invention is termed “optional first cut” or just “first cut” in the following description, where “optional” should be 200-> interpreted as “may or may not be performed” .
• These members may subsequently be face glued into rectangular pieces (8) or (9) .
• members (6), (7), (8), and (9) all of 40 mm thickness, may be obtained.
• the difference between 46 mm and 40 mm is due to lost material (approximately 3 mm 205-> on each side) caused by dressing the surfaces.
• edge profile (f) is obtained by machining the wane of the timber edges, i.e. not by machining an already cut face of the timber. Therefore the profiling process step does not reduce the yield.
• the purpose of an edge groove profile is to facilitate a precise and locked position of the
• the panel (7) has a thickness of 40 mm, and the panels (13) and (13') are both 18 mm thick.
• the difference of 4 mm, i.e. 40 mm - 2x18 mm, is due to kerf and dressing.
• Cutting (7) or (10) into more than two panels is also in principle
• part 1 While fig 4 illustrates two typical 265-> examples of the second processing part of this invention, there are • other feasible methods such as joining members (4) into laminated pieces (11) as shown in the upper part of fig 5. These pieces may subsequently be sawn into three or more panels as exemplified by (14) and (15) . Correspondingly, members with other profile forms
• part 2 Yet another example of the second processing part is shown in fig 6.
• fig 6 members (5) are joined into pieces (18) .
• (18) is cut in the middle, two panels will be obtained, each panel's 280-> "second cut" surface characterized by transverse growth rings and no spike knots.
• the lower part of fig 6 members (6) are joined into pieces (19) .
• joining 32o-> surfaces denotes the surfaces where the members are in contact with each other. This may be concretized by the pair of profiles (f9) and (g9) , that can be joined, but lacks a joining surface along a small part of the joint. On the other hand, the profiles (fl - f8) are joined with joining surfaces along the entire joint. 325-> Also note that members with profiles (f9) have to be rotated end to end (i.e. rotated 180 degrees around the z-axis) relative to members with profiles (g9) , in order to be joined.
• a method illustrated by fig 8 may be used.
• the method comprises employment of two cutters, a lower cutter (24) and an upper cutter (25) .
• This method has the advantage that, in addition to simply
• the inclination (a) of the knifes of the cutters should be less than 90 degrees in order to create a suitable groove 370-> profile; i.e. a profile that properly inhibits slip along x-axis during application of pressure in z-axis.
• a suitable groove 370-> profile i.e. a profile that properly inhibits slip along x-axis during application of pressure in z-axis.
• appropriate values of (a) are given in fig 8a - 8d.
• the cutter knifes have a straight slope given by a single angle (b) .
• This is a suitable form since in this case the lower cutter and the upper cutter can be manufactured equal.
• a straight slope angle is not an absolute requirement.
• Pieces such as (7 - 19) may be stacked layer-by-layer.
• the stacking may be done either with grains parallel. Or alternatively, by rotating each second layer by 90 degrees, giving layers with alternate direction of the grains (similar to plywood) .

Applications Claiming Priority (2)

Publications (1)

Family

ID=20283693

Family Applications (1)

Country Status (2)

Cited By (14)

Families Citing this family (1)

Citations (4)

• 2001
  • 2001-04-04 SE SE0101226A patent/SE525081C2/sv not_active IP Right Cessation
• 2002
  • 2002-04-04 WO PCT/SE2002/000680 patent/WO2002085587A1/en active Search and Examination

Patent Citations (4)

Also Published As

Similar Documents

Legal Events