CN211868108U

CN211868108U - Complexing laminated wood

Info

Publication number: CN211868108U
Application number: CN201921565993.1U
Authority: CN
Inventors: 余养伦; 于文吉; 闫昊鹏; 张耀明
Original assignee: Research Institute of Wood Industry of Chinese Academy of Forestry
Current assignee: Research Institute of Wood Industry of Chinese Academy of Forestry
Priority date: 2019-09-20
Filing date: 2019-09-20
Publication date: 2020-11-06
Anticipated expiration: 2029-09-20

Abstract

The utility model relates to a complex veneer belongs to and indicates to connect material processing technology field. The complex laminated wood comprises sawn timber and an adhesive layer, and is formed by stacking a plurality of layers of wood laminates according to a parallel and/or crossed structure, wherein the adhesive layer is arranged between the wood laminates of the adjacent layers, the complex laminated wood at least comprises one layer of complex wood laminate, the complex wood laminate is formed by longitudinally finger-jointing and/or transversely gluing the complex sawn timber, and the complex sawn timber is formed by complexing native sawn timber with metal salt and plant polyphenol; the adhesive is resorcinol adhesive or water-based high molecular isocyanate adhesive. The utility model provides a complex sawn timber forms through metal salt and plant polyphenol at the inside complex of primary sawn timber, forms the complex skeleton, can effectively support the cellulose skeleton when moisture absorption or dry shrinkage, prevents to indicate to connect the material to warp.

Description

Complexing laminated wood

Technical Field

The utility model relates to a wood working technology field, concretely relates to complex veneer.

Background

The laminated wood (also called as laminated wood or finger joint wood) is an engineering wood which is formed by using sawn timber as a basic unit and gluing the sawn timber by using an adhesive, and mainly comprises parallel structure laminated wood (Glulam) and cross structure laminated wood (CLT).

Compared with the raw wood, the laminated wood has the advantages of beautiful appearance, high strength, large allowable bending stress, uniform structure, small internal stress, difficult cracking and warping deformation and the like, and is widely applied. However, as a biomass material, veneer wood has the problems of wet expansion and dry shrinkage and the like other wood products, and the application of the veneer wood is greatly limited.

SUMMERY OF THE UTILITY MODEL

For solving the problem that exists among the prior art, the utility model provides a complex veneer, including the complex sawn timber, form at the inside complex of primary sawn timber through metal salt and plant polyphenol, form the complex skeleton, can effectively support the cellulose skeleton when absorbing moisture or dry shrinkage, prevent that the veneer from warping.

In order to solve the technical problem, the utility model provides a following technical scheme:

the utility model provides a complex laminated wood, which comprises wood laminates and an adhesive, wherein the complex laminated wood is formed by stacking and laminating multiple layers of wood laminates, and an adhesive layer is arranged between the adjacent wood laminates; the complex laminated wood at least comprises a complex wood laminate, the complex wood laminate is formed by longitudinally finger-jointing and/or transversely gluing and splicing complex sawn timber, and the complex sawn timber is formed by complexing native sawn timber with metal salt and plant polyphenol; the adhesive is resorcinol adhesive or water-based high molecular isocyanate adhesive.

Compared with the prior art, the utility model discloses following beneficial effect has:

the utility model discloses at first to leading-in plant polyphenol and metal salt respectively in the primary sawn timber, cellulose and hemicellulose in plant polyphenol and the timber combine, form the multiple spot hydrogen bond, and plant polyphenol and metal salt complex form "cellulose-plant polyphenol-metal salt" an organic whole structure, just as formed a plurality of supports in the cellulose skeleton molecule and supported, make it reduce when moisture absorption or desorption and do not produce inflation or shrink even. The use of the complexing sawn timber in complexing the laminated wood can effectively prevent the cracking and deformation of the laminated wood.

Drawings

Fig. 1 is a schematic structural view of a sawn timber finger joint surface in embodiment 2 of the present invention;

fig. 2 is a schematic structural view of a longitudinal finger-jointed sawn timber according to embodiment 2 of the present invention;

fig. 3 is a schematic structural view of a wood laminate according to embodiment 2 of the present invention;

fig. 4 is a schematic structural diagram of the complex laminated wood of embodiment 2 of the present invention;

fig. 5 is a schematic structural diagram of the glued laminated wood according to embodiment 3 of the present invention.

Detailed Description

In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, the following detailed description will be given with reference to specific embodiments.

In the utility model, the used materials and reagents are not specially explained and can be obtained from commercial approaches.

Example 1

Manufacturing method of white wax complexing sawn timber

Step 1: preparing a proper amount of original sawn timber;

11) sawing the ash tree into 2000mm long wood sections;

12) sawing the wood segments into sawn timber with the thickness of 40mm and the width of 40 mm;

13) the sawn timber was dried to a relative water content of 18%.

Step 2: introducing plant polyphenol into sawn timber to obtain polyphenol sawn timber;

21) dissolving tannic acid in water, and stirring to obtain plant polyphenol water solution with concentration of 10.0 g/L;

22) pressurizing and soaking the sawn timber in the plant polyphenol water solution for 24 hours at the soaking pressure of 0.6MPa and the soaking temperature of normal temperature, and introducing the polyphenol water solution to the surface, cell walls, cell cavities and/or cell gaps of the sawn timber;

23) drying the sawn timber dipped with the plant polyphenol water solution;

and step 3: introducing metal salt into polyphenol sawn timber to obtain polyphenol metal salt sawn timber

31) Dissolving aluminum sulfate in water, and uniformly stirring to obtain an aluminum sulfate solution with the concentration of 50 g/L;

32) pressurizing and dipping the polyphenol sawn timber in an aluminum sulfate solution for 30 days at normal temperature, and introducing the metal salt solution to the surface, cell walls, cell cavities and/or cell gaps of the sawn timber to obtain polyphenol metal salt sawn timber;

and 4, step 4: and drying the polyphenol metal salt sawn timber to obtain the complex sawn timber.

Example 2

A complex laminated wood is shown in figures 1-4 and is formed by gluing a plurality of layers of white wax wood laminates 2 according to a parallel structure, a glue layer 6 at a stacking position is arranged between every two adjacent wood laminates, and the complex laminated wood comprises three layers of complex white wax wood laminates 2;

the complex white wax wood laminate 2 is formed by longitudinally finger-jointing and transversely gluing and splicing a complex sawn timber 1 (prepared in example 1), the complex sawn timber 1 is in tooth joint and lengthening through a glue layer 3 at the transverse gluing and splicing part to form a longitudinally finger-jointed sawn timber 4, and the finger-jointed parts are arranged along the width direction in a staggered mode during transverse gluing and splicing.

One end of the complexing saw material 1 is provided with a tooth structure, the length of the finger joint tooth is 10mm, the width of the finger joint tooth is 2mm, and the tooth crest angle is 15 degrees.

The longitudinal finger joint sawn timber 4 is transversely glued and spliced in the width direction through a longitudinal finger joint glue layer 5 to form wood laminates 2, a stacking and laminating glue layer 6 is arranged between every two adjacent wood laminates 2, the finger joints are staggered in the thickness direction in the gluing process to obtain the complex glued timber, and the performance of the complex glued timber is shown in table 1.

The longitudinal finger joint glue layer 5, the transverse glue splicing glue layer 3 and the stacking and laminating glue layer 6 are resorcinol glue.

The traditional primary wood laminate is replaced by the complex wood laminate, and the problems of cracking and the like possibly caused in the use process of the laminated wood can be effectively prevented by the excellent dimensional stability of the complex sawn timber. The properties of the sawn timber after the complexing treatment are compared with those of sawn timber without the complexing treatment in the table 1. In the embodiment, the complexing sawn timber is used as a raw material to prepare the complexing laminated wood, so that the complexing laminated wood is reduced or even does not expand or shrink when absorbing moisture or desorbing. The complex wood veneer is used in the plywood, so that the cracking and deformation of the floor can be effectively prevented.

TABLE 1 comparison of properties of ash before and after complexing treatment

Example 3

Manufacturing method of pinus sylvestris complexing sawn timber

Step 1: preparing a proper amount of sawn timber;

11) sawing the octopus into wood sections with the length of 2.0 m;

12) sawing the wood segments into sawn timber with the thickness of 25mm and the width of 120 mm;

13) the sawn timber was dried to a relative water content of 18%.

21) dissolving larch tannin extract acid in water, and stirring to obtain plant polyphenol water solution with concentration of 2.0 g/L;

22) pressurizing and soaking the sawn timber in the plant polyphenol water solution for 8 hours at the soaking pressure of 1.0MPa and the soaking temperature of normal temperature;

23) drying the sawn timber dipped with the plant polyphenol water solution;

31) Mixing zinc borate and aluminum ammonium sulfate according to the proportion of 1: 1, uniformly dissolving the mixture in water in a proportion of 1, and uniformly stirring to form a mixed solution of zinc borate and ammonium aluminum sulfate, wherein the concentration is 5.0 g/L;

32) pressurizing and dipping the polyphenol sawn timber in a mixed solution of zinc borate and aluminum ammonium sulfate, wherein the dipping time is 6h, the dipping pressure is 0.8MPa, and the dipping temperature is normal temperature, so as to obtain polyphenol metal salt sawn timber;

and 4, step 4: drying the polyphenol metal salt sawn timber to obtain the complex sawn timber

Example 4

A kind of complex laminated wood, see figure 5, is stacked up according to the parallel by the multilayer wooden plywood 2 ', the wooden plywood 2 ' is that two layers of complex sawn timber and a layer of primary sawn timber 7 ' are glued, the complex sawn timber is set up in the upper, lower surface of the wood sawn timber of complex laminated wood;

the complex wood laminate 2' is formed by gluing and splicing a complex sawn timber 1 (prepared in example 3); the complexing sawn timber 1 is in toothed joint and lengthening through a transverse glue joint glue layer 3 ' to form a longitudinal finger joint sawn timber 4 ', the longitudinal finger joint sawn timber 4 ' is in transverse glue joint and width joint through a longitudinal finger joint glue layer 5 ' in the width direction to form wood laminates 2 ', a stacking and laminating glue layer 6 ' is arranged between every two adjacent wood laminates 2 ', and the wood laminates are glued to form the complexing laminated wood as shown in a table 2.

The transverse glue joint glue layer 3 ', the longitudinal finger joint glue layer 5 ' and the stacking and laminating glue layer 6 ' are aqueous high molecular isocyanate glue.

The primary wood laminate 7' is formed by gluing the finger-joint surfaces of the primary sawn timber, and only the raw materials are different from the complexing sawn timber, which is not described in detail herein.

The complex wood laminates are arranged on the upper surface and the lower surface of the laminated wood, and the primary wood laminates are arranged in the middle part, so that the laminated wood has excellent cracking resistance and reduces the production cost. Meanwhile, the complex laminated wood has better fireproof performance.

The properties of the sawn timber after the complexing treatment are compared with those of sawn timber without the complexing treatment in the table 2. As can be seen from the physical and mechanical properties in Table 2, the air-dried density of the material is slightly reduced and the volume is expanded after the complexing treatment; under the condition that the strength is basically kept consistent, the elastic modulus of the material is reduced, and the flexibility is increased; the dimensional stability is greatly increased; the fire-proof performance of the material is improved from the grade of No B2 to the grade of B1.

TABLE 2 comparison of Properties of Pinus sylvestris cross-glued wood before and after complexing

Performance index	Untreated	Complexing treatment
			Air-dried Density (g/cm)³)	0.43	0.41
Flexural Strength (MPa)	59.2	60.5
			Modulus of elasticity (GPa)	9.2	8.9
Radial dry shrinkage factor (%)	0.15	0.05
			Chord dry shrinkage factor (%)	0.33	0.09
Fire-proof performance	Stage B2	Stage B1

The complex wood layer plate is arranged on the surface of the native wood layer plate, so that the use cost is reduced; on the other hand, the surface of the laminated wood is provided with the complexing sawn timber, so that the laminated wood can be effectively prevented from absorbing moisture or being deformed by drying shrinkage.

Therefore, the utility model discloses rely on the excellent performance of complex sawn timber, can effectively prevent the fracture deformation of glued wood, improve the fire-protection rating.

The above description is a preferred embodiment of the present invention, and it will be apparent to those skilled in the art that a plurality of modifications and decorations can be made without departing from the principles of the present invention.

Claims

1. The complex laminated wood is characterized by comprising wood laminates and an adhesive layer, wherein the complex laminated wood is formed by stacking and laminating a plurality of wood laminates, and the adhesive layer is arranged between every two adjacent wood laminates; the adhesive layer comprises a longitudinal finger joint adhesive layer, a transverse adhesive splicing adhesive layer and a stacking adhesive layer; the complex laminated wood at least comprises a complex wood laminate, and the complex wood laminate is formed by longitudinally finger-jointing and/or transversely gluing complex sawn timber; the complex sawn timber is characterized in that a tooth structure is arranged at one end of the complex sawn timber, the complex sawn timber is in tooth joint lengthening through a glue layer at a transverse glue joint to form a longitudinal finger joint sawn timber, and the finger joints are arranged along the width direction in a staggered manner during transverse glue joint; the used adhesive is resorcinol adhesive or water-based high-molecular isocyanate adhesive;

the laminated wood also includes a native wood layer disposed between the laminated wood layers; the primary wood laminated plate is formed by longitudinally finger-jointing and/or transversely gluing primary sawn timber.

2. The laminated wood according to claim 1, wherein the sawn timber has a length of 80 to 2000mm, a width of 20 to 200mm, a thickness of 5 to 40mm, a finger joint length of 10 to 40mm, a width of 2 to 20mm, and a tip angle of 15 to 60 degrees.

3. The laminated wood complex as claimed in claim 1, wherein the laminated wood is formed by gluing adjacent layers of wood veneers in a parallel and/or cross structure in the thickness direction, and the finger joints are arranged in a staggered manner in the thickness direction.

4. The laminated wood of claim 1, wherein the laminated wood lumber comprises 2 laminated wood veneers and a plurality of virgin wood veneers; the complex wood plywood is arranged on the upper surface and the lower surface of the complex laminated wood.