CN104441103A - Gluing method for rosewood widening - Google Patents

Abstract

The invention provides a gluing method for rosewood widening, in particular to a gluing method for manufacturing rosewood furniture panels, floors and the like, and belongs to the field of rosewood furniture processing technologies. The method comprises the following steps: A. sawing the material: sawing the log into battens with required specifications; B. and (3) drying: firstly, placing a redwood batten sawn into a block of board in a ventilation place to be air-dried until the water content is 40-50%, then placing the batten into a drying kiln, and drying the drying kiln until the water content of the wood reaches 8-12%; C. processing the surface to be glued: planing or sanding the surfaces of the sawn timber to be glued to flatten the surface to be glued, and extruding needle-shaped pores on the glued surface of the padauk; D. glue application and width splicing: applying a double-component cold-pressing adhesive on the bonding surface of the panel strip side, and splicing two adjacent panel strips together through an adhesive column formed by the adhesive; E. gluing: and (3) placing the spliced plates in a cold press for pressing and bonding to obtain the required spliced panel. The invention can greatly improve the gluing performance of the padauk, can effectively reduce the production cost, and has good popularization value and huge economic and social benefits.

Description

Gluing method for mahogany width

technical field

The invention belongs to the field of mahogany furniture processing technology, and in particular relates to a method for improving the gluing performance of mahogany.

Background technique

The unique handicraft charm of the traditional machining technology of mahogany furniture endows mahogany furniture with high artistic value. The concept of mahogany furniture materials has been deeply ingrained in people's minds, and people have a deeper understanding of the value of mahogany furniture. However, modern production poses a challenge to the processing technology of mahogany furniture. The machining technology and processing technology of mahogany furniture must keep up with the pace of the times. Along with equipment, new technology and new technology, it is necessary to selectively inherit and develop handicrafts, so as to carry forward the charm of mahogany furniture.

Mahogany is widely used in various purposes such as building structures, decorative materials, and furniture. A series of mechanical processing and gluing processes are required from raw wood to solid wood finished products. Many mahogany materials often contain oil, and the parts processed into furniture are easy to "slip". In addition, mahogany has a high density, hard and delicate texture, and is not easy to be penetrated during the gluing process. In this way, when making panels and other products, due to gluing Low strength will cause glue opening when the panels are glued together. The mortise joints, finger joints, veneer veneer, jigsaw and other processes involved in the manufacture of mahogany furniture are all inseparable from the gluing technology. It can be seen that the adhesive occupies a very important position in the production of mahogany furniture, and the quality of the gluing performance directly affects its application in solid wood products and the improvement of wood added value.

At present, there are relatively few studies on the gluing performance of mahogany. Some scholars have tried to improve the gluing performance of mahogany by impregnating chemical agents, such as wax injection treatment, cold plasma, and water-based polymer isocyanate glue. Chemical agents will volatilize some toxic gases, such as formaldehyde, which affect the safety and health of users, and also cause environmental pollution problems. In addition, the adhesive currently used by enterprises for mahogany is epoxy resin-based cementing agent, which has good bonding performance, but is expensive and increases the production cost of the enterprise. It is urgent to develop an adhesive to improve the production efficiency of the enterprise.

Chinese patent document CN203488500U discloses a "mahogany furniture tenon strengthening structure", which uses a metal support plate fixed on the tenon of the mahogany component, and has raised or concave friction patterns on the outer surface, and the metal support plate is arranged on the tenon. On the stress-bearing surface, the section of the metal support plate is L-shaped, one side of which is embedded in the mahogany structure, and the other side is close to the side of the tenon, and the connection between the two sides of the metal support plate is a rounded transition. This method is only for standard boards, which may cause cracks or breaks during processing. In addition, the volume of precious mahogany is greatly lost, which affects the utilization rate of wood.

Chinese patent document CN103203789A discloses "a kind of manufacturing method of mahogany furniture". It is to bake the logs before the furniture is assembled. After baking, the stability of the logs is improved, and the shrinkage, Cracking and deformation phenomena. This method needs to dry the log for a long time and requires more energy to dry; it is prone to defects such as cracking in the process of reprocessing into boards in the later stage.

Chinese patent document CN103194167A discloses "a kind of one-component mahogany special glue and its preparation method", which calculates by mass parts, puts anhydride, PTA, adipic acid, ethylene glycol, diethylene glycol into the reaction kettle, Raise the temperature to 148°C to discharge water, then slowly raise the temperature to 240°C, keep warm for 2 hours with vacuum stirring, vacuumize and stir, then cool, add MDI to expand viscosity, add ethanol to dilute and discharge, and pack. The volume of the vacuum tank used in this method is limited, large-scale batch processing cannot be realized, and the equipment cost is relatively high; no comparison is made with respect to the heat preservation temperature and feeding amount of mahogany with different densities, and the practicability is relatively vague.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies of the prior art, and provide a more environmentally friendly and more firmly bonded gluing method for mahogany splicing.

In order to solve the above-mentioned technical problems, the present invention adopts the following technical solutions:

A kind of gluing method that is used for mahogany splicing width is characterized in that, comprises the following steps:

A. Sawn timber: Saw the logs into slats of required specifications;

B. Drying: first place the mahogany slats sawn into a piece of board in a ventilated place to air-dry until the moisture content is 40-50%, then put the slats into the drying kiln, and kiln-dry until the moisture content of the wood reaches 8-12%. %;

C. Processing of the surface to be glued: Plane or sand the surface of the sawn timber that needs to be glued to make the surface to be glued flat, and then extrude needle-shaped holes on the glued surface of the mahogany;

D. Gluing and splicing width: Apply two-component cold-press adhesive on the glued surface of the panel strip side, and splice the adjacent two panel strips together through the glue column formed by the adhesive;

E. Gluing: Place the spliced panels in a cold press for compaction and bonding to obtain the required assembled panels.

In the improved plan of the above-mentioned gluing method for mahogany splicing, in the step C, the diameter of the extruded small holes is 0.1-2mm, and the depth is 0.2-1mm; the number of holes is 5-50 /cm ² .

In the improvement plan of the above-mentioned gluing method for mahogany splicing, in the step D, a two-component cold-press adhesive is used, and the coating amount is 120-160 g/m ² .

In the improvement plan of the above-mentioned gluing method for mahogany splicing, in the step E, the temperature of the cold press is 25-35° C., the pressure is 0.5-0.8 MPa, and the holding time is 25-60 minutes.

In the improvement scheme of the above-mentioned gluing method for mahogany splicing, in the step B, kiln drying until the moisture content of the wood reaches 10-12%.

Compared with the prior art, the beneficial effect of the present invention is: it increases the permeability of the adhesive by extruding many needle-shaped holes on the glued surface, and at the same time enhances the bonding strength of the mahogany in the process of widening the mahogany, making the mahogany The bonding of the widening is stronger; and in the preparation process, the loss of wood volume is small, and there is no need to impregnate resins and other chemical substances that cause environmental pollution. Therefore, the mahogany boards made by this method are more environmentally friendly and have stronger bonding strength.

Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

【Description of drawings】

Fig. 1 is the front view of the slat to be spliced together of the embodiment of the present invention;

Fig. 2 is the partial enlargement figure of I part of Fig. 1;

Fig. 3 is the right view of Fig. 1;

Fig. 4 is the structural representation after the panel bar of the embodiment of the present invention is glued.

【Detailed ways】

A gluing method for mahogany splicing, comprising the following steps:

A, sawn timber: the log is sawed into the lath 1 of required specification, as shown in Figure 1 to 3;

B. Drying: first place the slat 1 in a ventilated place and air-dry it to a moisture content of 40-50%, then put the slat 1 into a drying kiln, and kiln-dry it until the moisture content of the wood reaches 8-12%;

C. Processing of the surface to be glued: planing or sanding the surfaces of the sawn timber that need to be glued to make the surface to be glued smooth;

D. Glue sizing and widening: apply commonly used two-component cold-press adhesive on the glued surface of the side of the panel, the coating amount is 120~160g/m ² , and the glue column 2 formed by the adhesive will connect the two adjacent panels 1 stitched together;

E. Gluing: Place the spliced panels in a cold press at a temperature of 25-35°C, a pressure of 0.5-0.8MPa, and a holding time of 25-60 minutes to obtain the required assembled panel.

Preferably, in the above preparation method, the holes extruded on the side surface of mahogany in the processing step are holes with a diameter of 0.3-1 mm and a depth of 0.2-0.8 mm. A more preferred diameter is 0.6 mm and a depth is 0.6 mm.

Preferably, in the above preparation method, the temperature of the cold press in the processing step is 25-35°C, the pressure is 0.5-0.8MPa, and the holding time is 25-60min; more preferably, the temperature is 30°C, and the pressure is 0.6MPa , The holding time is 30min.

For the drying process, it is preferable to use a wood moisture content of 10-12%, which can effectively solve the problems of deformation, gaps and bubbling during the splicing process, and has better stability during use.

It increases the permeability of the adhesive by extruding many needle-shaped holes on the glued surface, and at the same time enhances the bonding strength of the mahogany during the process of widening the mahogany, making the bonding of the mahogany more firm; and during the preparation process, the wood The loss of volume is small, and there is no need to impregnate resins and other chemical substances that cause environmental pollution. Therefore, the mahogany panels made by this method are more environmentally friendly and have stronger bonding strength; in addition, the mahogany panels glued by this method can be used for Manufacture of mahogany tabletops, mahogany chair panels, mahogany desk panels, mahogany cabinet panels and mahogany solid wood floors, etc., with good dimensional stability and good decorative properties.

Embodiment one:

Using iron pigeonpea mahogany, the gluing method is as follows:

A． Log sawing: cut the log into 1-2m long wood sections, and use a band saw to cut into slats of required specifications;

B. Drying: first put the sawn timber in a ventilated place and air-dry until the moisture content is 40-50%, then put the sawn timber into the drying kiln, control the temperature in the kiln at 35-50°C, and the relative humidity at 30-100%. Dry the wood to a moisture content of 10-12%; during the air-drying and kiln-drying process, attention should be paid to stacking, ventilation, temperature and humidity, to minimize shrinkage, cracking and other defects during the drying process, which will affect the drying quality and processing process .

C. Processing: planing or sanding the mahogany glued surface; select the diameter and depth of the hole to be punched according to the material; squeeze the hole on the side surface of the mahogany, with a diameter of 0.5mm and a depth of 0.5mm;

D. Sizing and width: apply commonly used two-component cold-press adhesive on the splicing side, the sizing amount is 160g/m ² , pre-press after the panel is assembled; when gluing, ensure that the surface to be coated is smooth and free of sawdust Etc., the amount of adhesive coating should be uniform, and the missing part must be coated in place with manual brushing.

E. Cold pressure gluing: Place the glued and spliced panels on a cold press at a temperature of 30°C, a pressure of 0.8MPa, and a holding time of 40 minutes; after cold pressing, the pressure holding must be carried out according to the above standards, and then let it Natural cooling in the air; for different tree species, the temperature and pressure of cold pressing should be strictly controlled to avoid volume loss;

F. Slab repair, sanding and trimming: use putty to repair the board surface, after drying, perform double-sided sanding or fine sanding on the sander, and then cut into finger-jointed boards of required specifications;

H. Inspection, packaging and storage: inspect the finger joint boards, and pack the products that pass the inspection into storage.

After testing, the gluing performance of iron pea wood in Example 1 is significantly improved, the gluing performance is 78.4% higher than that of the directly glued wood, the tensile strength is 68% higher, and the wood breakage rate and dimensional stability are greatly improved. Under this process, there are few defects such as wood cracking, and the loss of wood volume is small. Without modification, the original characteristics of precious wood are maintained.

Embodiment two:

Using flower branch mahogany, the gluing method is as follows:

A． Log sawing: cut the log into 1-2m long wood sections, and use a band saw to cut into slats of required specifications;

B. Drying: first put the sawn timber in a ventilated place and air-dry until the moisture content is 40-50%, then put the sawn timber into the drying kiln, control the temperature in the kiln at 35-50°C, and the relative humidity at 30-100%. Dry the wood to a moisture content of 10-12%; during the air-drying and kiln-drying process, attention should be paid to stacking, ventilation, temperature and humidity, to minimize shrinkage, cracking and other defects during the drying process, which will affect the drying quality and processing process .

C. Processing: planing or sanding the mahogany glued surface; select the diameter and depth of the hole to be drilled according to the material; squeeze the hole on the side surface of the mahogany, with a diameter of 0.6mm and a depth of 0.6mm;

D. Sizing and width: Apply commonly used two-component cold-press adhesive on the side of the splicing, the amount of sizing is 140g/m ² , and pre-press after the panel is assembled; when gluing, ensure that the surface to be coated is smooth and free of sawdust Etc., the amount of adhesive coating should be uniform, and the missing part must be coated in place with manual brushing.

E. Cold pressure gluing: Place the glued and spliced panels on a cold press at a temperature of 35°C, a pressure of 0.6MPa, and a holding time of 35 minutes; after cold pressing, the pressure must be maintained according to the above standards, and then let it Natural cooling in the air; for different tree species, the temperature and pressure of cold pressing should be strictly controlled to avoid volume loss;

F. Slab repair, sanding and trimming: use putty to repair the board surface, after drying, perform double-sided sanding or fine sanding on the sander, and then cut into finger-jointed boards of required specifications;

H. Inspection, packaging and storage: inspect the finger joint boards, and pack the products that pass the inspection into storage.

After testing, the gluing performance of the flower branch wood in Example 1 is significantly improved, the gluing performance is 69.5% higher than that of the directly glued wood, the tensile strength is increased by 45%, and the wood breakage rate and dimensional stability are greatly improved. Under this process, there are few defects such as wood cracking, and the loss of wood volume is small. Without modification, the original characteristics of precious wood are maintained.

Although the present invention has been described in detail with reference to the above embodiments and departs from the principle and spirit scope of the present invention defined by the claims, various changes or modifications can be made to the present invention, but it will be obvious to those skilled in the art through this disclosure Yes, the detailed description of the embodiments of the present disclosure is only for explanation, not for limiting the present invention, but the content of the claims defines the scope of protection.

Claims (5)

1. spell a wide gluing method for redwood, it is characterized in that, comprise the steps:

A, sawn timber: lath log being sawn into required specification;

B, drying: first the redwood lath being sawn into one block of block sheet material being placed in ventilation gas, to do to moisture content be 40 ~ 50%, then lath is loaded dry kiln, kiln drying reaches 8 ~ 12% to moisture content;

C, treat cemented surface processing process: to sawn timber need gummed those faces carry out slicing or sanding process, make to treat that coated face is smooth, then squeeze out needle-like aperture at redwood cemented surface;

D, applying glue are spelled wide: apply cold pressing glue stick at the cemented surface of face panel side, and be stitched together by two adjacent surfaces lath by the glue post that adhesive is formed;

E, gummed: the sheet material spliced is placed in cold press and carries out compression bonding, obtain required assembled panel.

2. according to claim 1ly spell wide gluing method for redwood, it is characterized in that, in described step C, the hole diameter squeezed out is 0.1 ~ 2mm, the degree of depth is 0.2 ~ 1mm; The quantity in hole is 5 ~ 50/cm ².

3. according to claim 1 and 2ly spell wide gluing method for redwood, it is characterized in that, in described step D, adopt two component cold pressing glue stick, coating weight 120 ~ 160g/m ².

4. according to claim 3ly spell wide gluing method for redwood, it is characterized in that, in described step e, cold press temperature is 25 ~ 35 DEG C, and pressure is 0.5 ~ 0.8MPa, and the dwell time is 25 ~ 60min.

5. according to claim 4ly spell wide gluing method for redwood, it is characterized in that, in described step B, kiln drying reaches 10 ~ 12% to moisture content.