CN101486208A - Bamboo wood composite plywood for concrete form panel and manufacturing method thereof - Google Patents

Abstract

The invention relates to a bamboo-wood composite plywood for concrete formwork and a manufacturing method thereof. The bamboo-wood composite plywood has a body made of first log rotary-cut veneers and bamboo curtains arranged at intervals and made by hot pressing. The body has an odd number of layers, and the first log rotary-cut veneers are located on the surface of the body. The outside of the body can also be composited with bamboo mat or veneer. The manufacturing method of the bamboo-wood composite plywood comprises the steps of forming raw wood veneers, bamboo curtains and/or bamboo mats, pre-pressing, aging, hot-pressing and the like. The bamboo-wood composite plywood provided by the invention realizes the combination of bamboo and log rotary-cut veneer, improves the utilization rate of wood and bamboo, and at the same time, greatly improves the performance of the plywood, the structure is more stable, and the bonding strength and transverse static bending strength are equal. It has been greatly improved; and in the manufacturing process, there is no need to perform complicated dipping and other treatments on bamboo curtains and bamboo mats, which greatly reduces the amount of adhesives used, reduces processing costs, and is conducive to environmental protection.

Description

Bamboo-wood composite plywood for concrete formwork and manufacturing method thereof

technical field

The invention belongs to the field of wood processing, and in particular relates to a bamboo-wood composite plywood for concrete formwork and a manufacturing method thereof. The bamboo-wood composite plywood is a plywood produced by hot pressing with artificial bamboo and wood as raw materials.

Background technique

Structural plywood includes building formwork, container floor, automobile compartment floor, wooden structure cladding and other plywood applied to stressed components. Generally, wood veneers or bamboo curtains, bamboo mats, etc. are glued together with adhesives such as phenolic resin or isocyanate, and then Made by hot pressing. Among them, bamboo structure plywood is used in a large amount, but its processing technology is complicated. Among them, the dipping operation of bamboo has high requirements on the control of process conditions, the process cycle is long, and the amount of adhesive is large, which is not conducive to improving production efficiency and reducing costs. Not conducive to environmental protection. The existing bamboo structure plywood processing technology mainly includes the following technological process:

Raw bamboo → cross-cutting → cutting bamboo → cutting strips → removing knots → removing bamboo green and yellow → cutting bamboo strips → making bamboo curtains, bamboo mats → drying → dipping → drying → forming blanks → hot pressing → aging → cutting edges, Sanding → inspection, storage.

No. 02219712.5 utility model patent discloses a bamboo-wood composite blockboard that can be used as a building template. , glued and hot pressed. However, the loss of the sawing path in the processing of the wooden strips is relatively large, and there are certain difficulties in processing large-format boards by using the technical solution disclosed in the utility model patent, and the overall performance of the processed boards is poor.

It is an urgent problem to be solved in the field of wood processing to develop a new bamboo-wood composite plywood, combine the excellent properties of bamboo and wood, give full play to the respective advantages of bamboo and wood, and obtain plywood with high quality and high strength. Moreover, it is of great significance to study how to make rational and efficient use of wood veneers to manufacture structural plywood, and to study how to use low-density plantation wood as raw materials to manufacture low-cost and high-strength structural plywood.

Contents of the invention

In order to solve the above-mentioned technical problems, the object of the present invention is to provide a kind of bamboo-wood composite plywood, this bamboo-wood composite plywood is to replace part of bamboo with wood, and is formed by gluing and hot-pressing log rotary-cut veneer, bamboo curtain and/or bamboo mat Yes, the plywood has a firm structure and high strength, and is especially suitable for use as a concrete formwork.

The object of the present invention is also to provide a kind of manufacturing method of above-mentioned bamboo-wood composite plywood, this method adopts log rotary-cut veneer and bamboo to manufacture bamboo-wood composite plywood, does not need to dipping bamboo and other operations, has simple process, adhesive Small amount, high utilization rate of wood and so on.

In order to achieve the above object, the present invention provides a bamboo-wood composite plywood, which has a body made of the first log rotary-cut veneer and bamboo screen interval blanks, which are made by hot pressing, wherein the body is an odd number of layers, and The first log rotary-cut veneer is located on the surface of the body.

In the bamboo-wood composite plywood provided by the present invention, the body composed of the first log rotary-cut veneer and the bamboo curtain plays a major role in the strength and other mechanical properties of the bamboo-wood composite plywood. According to the specific technical solution of the present invention, the body can be directly used as the final product of plywood. Preferably, in order to make the bamboo-wood composite plywood have a relatively smooth surface, the two surfaces of the body can also be compounded with a layer of bamboo mat or a second log rotation. Cut the veneer to form the surface layer of the bamboo-wood composite plywood. The above-mentioned bamboo mat or the second log rotary-cut veneer is combined with the first log rotary-cut veneer and the bamboo curtain by hot pressing, which not only provides a smooth surface for the bamboo-wood composite plywood of the present invention, but also can provide bamboo and wood The mechanical properties of composite plywood make a certain contribution.

The bamboo-wood composite plywood provided by the present invention can meet the requirements of different use environments on the performance of the plywood. In order to further improve its wear resistance and aesthetics, the bamboo-wood composite plywood can be peeled on the surface of the bamboo-wood composite plywood, preferably on the bamboo mat or the second log. The outer surfaces of the veneers are covered with impregnated paper, which is a commonly used material in the field for veneering or laminating boards, such as phenolic resin impregnated paper, melamine impregnated paper, and the like. This kind of impregnated paper is obtained by impregnating a certain thickness of paper with an adhesive. The impregnated paper will contain a certain amount of adhesive and can be formed by hot pressing or cold pressing.

According to the specific technical scheme of the present invention, the first log rotary-cut veneer used in the present invention, the second log rotary-cut veneer, bamboo mats and bamboo curtains, etc. It is obtained by processing using the processing technology.

The preferred bamboo-wood composite plywood provided by the present invention can be formed by gluing and hot-pressing the first log rotary-cut veneer, the second log rotary-cut veneer, bamboo curtain and/or bamboo mat according to odd-numbered layer formation, wherein , the thickness of the first log rotary-cut veneer can be about 1.5-8.0 mm, the moisture content can be controlled at 6%-12%, the thickness of the second log rotary-cut veneer can be lower than the first log rotary-cut veneer, generally 0.5-3.0 mm, the moisture content can be controlled to 6%-12%. The logs suitable for rotary cutting to manufacture the first log rotary veneer and the second log rotary veneer include one or more of fast-growing poplar, masson pine, larch, fir and eucalyptus; The thickness can be controlled at 1.0-4.5 mm, the thickness of the bamboo mat can be controlled at 0.5-2.5 mm, and the moisture content can be controlled at 6%-12%. The raw material can be selected from commonly used bamboo materials, such as moso bamboo.

According to the specific technical solution of the present invention, the body of the bamboo-wood composite plywood can include at least two layers of the first log rotary-cut veneer and at least one layer of bamboo curtain; as a preferred solution, two layers of the second log rotary-cut veneer can also be Or the bamboo mat is used as the surface layer of the bamboo-wood composite plywood, and is respectively arranged on the outer surface of the first log rotary-cut veneer positioned at the surface layer (that is, the two layers of the first log rotary-cut veneer positioned at the surface layer of the body are not in contact with the surface of the bamboo curtain. ), at this moment, the first log rotary-cut veneer is positioned at the subsurface layer of the bamboo-wood composite plywood:

Wherein, 1. When bamboo mat is used as the surface layer: the bamboo-wood composite plywood comprises two layers of bamboo mat, at least two layers of the first log rotary-cut veneer and at least one layer of bamboo curtain;

2. When the second log rotary-cut veneer is used as the surface layer: the bamboo-wood composite plywood includes two layers of the second log rotary-cut veneer, at least two layers of the first log rotary-cut veneer and at least one layer of bamboo curtains.

The total number of layers of the bamboo-wood composite plywood provided by the invention is an odd number, and its thickness can be controlled as about 9-28 millimeters; preferably, the total number of layers of the bamboo-wood composite plywood (comprising bamboo mat and the second log rotary-cut veneer) is 3-21 floors.

In the bamboo-wood composite plywood of the present invention, when the surface layer is the first rotary-cut veneer log, the second surface layer is a bamboo curtain, the first rotary-cut veneer log and the bamboo curtain are arranged at intervals, and the first rotary-cut veneer log is arranged at intervals. There is no contact between them, and the bamboo curtains do not touch each other;

When the surface layer is a bamboo mat, the subsurface layer is the first rotary-cut veneer log, bamboo curtains and/or bamboo mats on both sides of the first rotary-cut veneer log, and the first rotary-cut veneer log does not contact each other, and the bamboo The curtains do not touch each other;

When the surface layer is the second log rotary-cut veneer, the subsurface layer is the first log rotary-cut veneer, and both sides of the bamboo curtain are the first log rotary-cut veneer, and the first log rotary-cut veneer does not touch each other, and the bamboo The curtains also do not touch each other.

As a non-limiting embodiment of the present invention, the combined mode of bamboo-wood composite plywood provided by the present invention can be exemplified as follows:

1. When the bamboo-wood composite plywood has three layers, it may include: two layers of the first log rotary-cut veneer and a layer of bamboo curtain, wherein the surface layer is the first log rotary-cut veneer, and the core layer is the bamboo curtain;

2. When the bamboo-wood composite plywood has five layers, it may include:

(1) Three layers of the first log rotary-cut veneer and two layers of bamboo curtains, wherein the surface layer of the plywood is the first log rotary-cut veneer, the subsurface layer is bamboo curtains, and the core layer is a layer of the first log rotary-cut veneer ;or,

(2) Two layers of bamboo mats, two layers of the first log rotary-cut veneer and one layer of bamboo curtain, wherein the surface layer of the plywood is bamboo mat, the subsurface is the first log rotary-cut veneer, and the core layer is a layer of bamboo curtain ;or,

(3) Two layers of the first log rotary-cut veneer, one layer of bamboo curtain and two layers of the second log rotary-cut veneer, wherein the surface layer of the plywood is the second log rotary-cut veneer, and the sub-surface layer is the first log rotary-cut veneer veneer, the core layer is a layer of bamboo curtain;

3. When the bamboo-wood composite plywood has seven layers, it may include:

(1) Four layers of the first log rotary veneer and three layers of bamboo curtains, wherein the surface layer of the plywood is the first log rotary veneer, the subsurface is the bamboo curtain, and the core layer is two layers of first log rotary veneers arranged at intervals. cut veneer and a bamboo screen between two layers of the first log peeled veneer; or,

(2) Two layers of bamboo mats, three layers of the first log rotary-cut veneer and two layers of bamboo curtains, wherein the surface layer of the plywood is bamboo mat, the subsurface is the first log rotary-cut veneer, and the core layer is a set at intervals. A layer of first log rotary-cut veneer and two layers of bamboo curtains, the first log rotary-cut veneer is located between the two layers of bamboo curtains; or,

(3) Two layers of the second rotary-cut log veneer, three layers of the first log rotary-cut veneer and two layers of bamboo curtains, wherein the surface layer of the plywood is the second log rotary-cut veneer, and the subsurface is the first log rotary-cut veneer veneer, the core layer is two layers of bamboo curtains arranged at intervals and a layer of first log rotary-cut veneer, and the first log rotary-cut veneer is located between the two layers of bamboo curtains;

4. When the bamboo-wood composite plywood has nine layers, it may include:

(1) Five layers of the first log rotary-cut veneer and four layers of bamboo curtains, wherein the surface layer of the plywood is the first log rotary-cut veneer, the subsurface is a bamboo curtain, and the core layer is three layers of first log rotary veneers arranged at intervals. Cut veneer and two layers of bamboo curtains, the bamboo curtains do not touch each other; or,

(2) Two layers of bamboo mats, four layers of the first log rotary-cut veneer and three layers of bamboo curtains, wherein the surface layer of the plywood is bamboo mat, the sub-surface layer is the first log rotary-cut veneer, and the core layer is two layers arranged at intervals. A first layer of rotary-cut veneer logs and three layers of bamboo curtains, the first rotary-cut veneers of logs are not in contact with each other; or,

(3) Two layers of the second log rotary-cut veneer, four layers of the first log rotary-cut veneer and three layers of bamboo curtains, wherein the surface layer of the plywood is the second log rotary-cut veneer, and the subsurface is the first log rotary-cut veneer veneer, the core layer is three layers of bamboo curtains arranged at intervals and two layers of the first log rotary-cut veneer, and the first log rotary-cut veneer does not contact each other;

5. When the bamboo-wood composite plywood has more than nine layers, its combination method is similar to the above example combination method.

Unless otherwise specified, the "surface layer" mentioned in the present invention refers to the outermost layer of bamboo-wood composite plywood, which can be called "upper and lower surface layers" or "surface board". According to its specific structure, it can be the first log rotation Cut veneer, bamboo mat or second log rotary-cut veneer; the second layer adjacent to the upper and lower surfaces can be collectively referred to as "sub-surface" or "sub-surface", which can be the first log rotary-cut veneer or bamboo curtain .

The present invention also provides the manufacture method of above-mentioned bamboo-wood composite plywood, and it can comprise the following steps:

According to the odd-numbered layer billet method, the first log rotary-cut veneer with a thickness of 1.5-8.0 mm and a moisture content of 6%-12% is separated from the bamboo curtain with a thickness of 1.0-4.5 mm and a moisture content of 6%-12%. Setting, slabs are obtained through gluing and billet assembly, and the gluing surface is the gluing surface of the first log rotary-cut veneer;

Pre-pressing the slab at room temperature;

Carry out aging treatment on the pre-pressed slab;

Hot-press the pre-pressed and aged slabs.

According to a specific embodiment of the present invention, when manufacturing a bamboo-wood composite plywood whose surface layer is a bamboo mat or a second bamboo-wood composite plywood, the manufacturing method provided by the present invention may also include: arranging a layer of bamboo on each of the two surfaces of the slab. mat or the second log rotary-cut veneer to form the surface layer of the slab, and in the process of gluing, double-sided glue coating is performed on the first log rotary-cut veneer. In the specific implementation, the first log rotary-cut veneer and bamboo curtain, and the bamboo mat or the second log rotary-cut veneer positioned on the surface are assembled as required to obtain a slab (i.e. the slab of bamboo-wood composite plywood), wherein, The first log rotary-cut veneer is located on the subsurface layer of the slab, and then the bamboo-wood composite plywood of the present invention can be obtained through steps such as pre-pressing, aging and hot-pressing.

According to a preferred embodiment of the present invention, the manufacturing method of the bamboo-wood composite plywood provided by the present invention may also include the step of pasting impregnated paper: respectively pasting impregnated paper on the surface of the bamboo-wood composite plywood obtained by hot pressing, that is, impregnated paper Paste the bamboo mat on the surface of the bamboo-wood composite plywood or the outer surface of the second log rotary-cut veneer, which is formed by hot pressing or cold pressing, or impregnated before pre-pressing and hot-pressing the slab. The paper is pasted on the surface layer of the slab, and then the slab is pre-pressed and hot-pressed and molded on the surface layer of the bamboo-wood composite plywood to obtain the bamboo-wood composite plywood covered with the impregnated paper.

According to the specific technical solution of the present invention, the above-mentioned first log rotary-cut veneer, second log rotary-cut veneer, bamboo curtain, bamboo mat, etc. can be finished products that have been processed, or conventional processing techniques in this field can be used. Obtained by processing logs and bamboo, such as:

The processing steps of log rotary veneer include: 1. Saw cutting and rotary cutting: saw the log into wood segments according to the predetermined size, and rotary cut it into log rotary veneer; 2. Drying: use drying equipment to peel the log The veneer is dried; 3. Shearing: process the dried log rotary cut veneer into a predetermined size;

The processing steps of bamboo curtains and bamboo mats include: 1. Cutting off bamboo, cutting bamboo, removing knots, removing green and yellowing, and cutting bamboo strips to process bamboo mats or bamboo curtains; 2. Drying: using drying equipment to dry bamboo mats and bamboo mats. The curtain is dried to make it reach a certain moisture content; 3. Cutting: process the dried bamboo mat and bamboo curtain into a predetermined size.

In actual production, the processing steps of log rotary-cut veneer, bamboo curtain and bamboo mat and the manufacturing process steps of bamboo-wood composite plywood can form a complete technological process, and the manufacture method of bamboo-wood composite plywood provided by the invention can also include The step of processing log rotary-cut veneer, bamboo curtain and/or bamboo mat does not mean that the manufacturing method of bamboo-wood composite plywood provided by the present invention must include the above-mentioned processing steps.

In a specific embodiment of the present invention, the first log rotary-cut veneer, the second log rotary-cut veneer, bamboo curtain and/or bamboo mat can be selected according to the thickness of the bamboo-wood composite plywood to be manufactured, and then in the first The composite surface (gluing surface) of the log rotary-cut veneer contacting with bamboo curtain, bamboo mat or the second log rotary-cut veneer is coated with adhesive (adhesive is all coated on the surface of the first log rotary-cut veneer), and then According to the odd-numbered layer blanking method, the first log rotary-cut veneer, bamboo curtain, the second log rotary-cut veneer and/or bamboo mat are formed into the required slabs (when forming blanks, considering the subsequent pre-compression and heat pressure treatment, the thickness of the slab should be greater than the thickness of the bamboo-wood composite plywood), and then the slab is pre-pressed and hot-pressed to obtain a predetermined bamboo-wood composite plywood; wherein, the first log rotary-cut veneer When applying glue, the adhesives used are various adhesives commonly used in the field of plywood manufacturing, such as phenolic resin adhesives, isocyanate water-resistant adhesives, etc., and the amount of glue applied can be controlled at about 260-400g/ ^m2 , which is conducive to meeting the requirements of the final plywood. Performance requirements such as bonding strength.

According to the specific technical scheme of the present invention, the slabs after the billet assembly are pre-pressed at room temperature for 10-30 minutes to facilitate further hot pressing. Under the circumstances, it should not be higher than 0.8MPa. After pre-pressing, the slab is aged for 60-180 minutes.

In the manufacturing method provided by the present invention, hot-pressing the pre-pressed and aged slabs refers to performing two-stage hot-pressing on the pre-pressed and aged slabs sequentially at a temperature of 125°C-155°C, The hot pressing conditions of the first stage are: hot pressing pressure 1.2-4.0MPa, pressure duration 1.0-2.0min/mm (based on the thickness of the slab without pre-pressing); the second hot pressing conditions are: hot pressing The pressure is 0.3-0.6MPa, and the pressure is applied for 1-3 minutes.

The bamboo-wood composite plywood of the present invention adopts the combination of log rotary-cut veneer and bamboo, which promotes the application of rotary-cut technology in the field of plywood, improves the utilization rate of wood and bamboo, and reduces the manufacturing cost of plywood, wherein the utilization rate of wood is at least It can be improved by 10%; and the bamboo-wood composite plywood manufactured by the invention is suitable for building templates, especially concrete templates, and its quality and performance far exceed the relevant technical indicators in GB/T17656-1999.

The manufacturing method of bamboo-wood composite plywood provided by the invention combines the existing techniques of bamboo and wood plywood, simplifies the existing bamboo plywood processing technology, and does not need to carry out complex dipping and other treatments to bamboo curtains and bamboo mats, etc., The consumption of the adhesive is greatly reduced, the processing cost is reduced, and the reduction of the consumption of the adhesive is also beneficial to environmental protection. Adopting the manufacturing method of the bamboo-wood composite plywood provided by the invention can effectively improve the production efficiency, the performance of the manufactured bamboo-wood composite plywood has also been greatly improved, the structure is more stable, and its gluing strength and lateral static bending strength are relatively large. Improvement; the use of log rotary veneer can also effectively improve the comprehensive utilization of wood.

Description of drawings

Fig. 1 is a schematic diagram of the blank structure of the bamboo-wood composite plywood of Examples 1 and 2 of the present invention.

Fig. 2 is a schematic diagram of the blank structure of the bamboo-wood composite plywood in Example 3 of the present invention.

Explanation of reference numbers:

Bamboo mat 1 The first log rotary-cut veneer 2 Bamboo curtain 3 The second log rotary-cut veneer 4

Detailed ways

The implementation and effects of the present invention will be further introduced below through specific examples, the purpose of which is to help readers better understand the essence and spirit of the present invention, which cannot be construed as limiting the implementation scope of the present invention.

The bamboo-wood composite plywood provided by the present invention can be composited by log rotary-cut veneer, bamboo mat and bamboo curtain, or can be composited by log rotary-cut veneer and bamboo curtain, and its manufacturing method can include the following Three specific steps:

1. The first log rotary-cut veneer, bamboo-wood composite plywood composited with bamboo mats and bamboo curtains:

1. Sawing and rotary cutting: the log is sawed into wood segments according to the predetermined size, and then rotary cut into the first log rotary veneer;

2. Bamboo mat and bamboo curtain processing: cut bamboo, cut bamboo, remove knots, remove green and yellow, and cut strips to process bamboo mats and bamboo curtains;

3. Drying: use drying equipment to dry the first log rotary veneer, bamboo mat and bamboo curtain;

4. Cutting: process the dried first log rotary-cut veneer, bamboo mat and bamboo curtain into predetermined sizes;

5. Glue adjustment and gluing: apply double-sided gluing to the first log rotary-cut veneer;

6. Blank assembly: Assemble the first log rotary-cut veneer, bamboo curtain and bamboo mat to obtain a slab. The surface layer of the slab is bamboo mat, and the subsurface is the first log rotary-cut veneer coated with glue. When the blank has more than 5 layers, the core layer is the first log rotary-cut veneer and/or bamboo curtain arranged at intervals;

7. Pre-pressing: pre-pressing the slab;

8. Aging: aging treatment of the pre-pressed slab;

9. Hot pressing: hot pressing the pre-pressed and aged slab;

10. Edge trimming: After cooling the hot-pressed slab, trim the edge according to the predetermined size;

11. Sanding and grading: Sanding and grading the cut plywood.

2. The first bamboo-wood composite plywood made of log rotary-cut veneer and bamboo curtain:

1. Sawing and rotary cutting: the log is sawed into wood segments according to the predetermined size, and then rotary cut into the first log rotary veneer;

2. Bamboo curtain processing: cut bamboo, cut bamboo, remove knots, remove green and yellow, and cut bamboo strips to process into bamboo curtains;

3. Drying: use drying equipment to dry the first log rotary-cut veneer and bamboo curtain;

4. Cutting: process the dried first log rotary-cut veneer and bamboo curtain into a predetermined size;

5. Glue adjustment and gluing: apply glue to the compound surface of the first log rotary-cut veneer in contact with the bamboo curtain, that is, apply glue to one side of the first log rotary-cut veneer on the surface layer, and apply glue to the other first log rotary-cut veneer. Log rotary-cut veneer is double-sided glued;

6. Blank assembly: the first log rotary-cut veneer and the bamboo curtain are arranged at intervals to form a blank to obtain a slab. The surface layer of the slab is the first log rotary-cut veneer coated with glue on one side, and the subsurface is a bamboo curtain;

7. Pre-pressing: pre-pressing the slab;

8. Aging: aging treatment of the pre-pressed slab;

9. Hot pressing: hot pressing the pre-pressed and aged slab;

10. Edge trimming: After cooling the hot-pressed slab, trim the edge according to the predetermined size;

11. Sanding and grading: Sanding and grading the cut plywood.

3. The first log rotary-cut veneer, the second log rotary-cut veneer and bamboo-wood composite plywood:

1. Saw cutting and rotary cutting: the log is sawed into wood sections according to the predetermined size, and then rotary cut into the first log rotary veneer and the second log rotary veneer;

2. Bamboo curtain processing: cut bamboo, cut bamboo, remove knots, remove green and yellow, and cut bamboo strips to process into bamboo curtains;

3. Drying: use drying equipment to dry the first log rotary veneer, the second log rotary veneer and bamboo curtain;

4. Cutting: process the dried first log rotary-cut veneer, second log rotary-cut veneer and bamboo curtain into a predetermined size;

5. Glue adjustment and gluing: apply double-sided gluing to the first log rotary-cut veneer;

6. Blank assembly: Assemble the second log rotary-cut veneer, the first log rotary-cut veneer and the bamboo curtain to obtain a slab. The surface layer of the slab is the second log rotary-cut veneer, and the subsurface is the first log Rotary-cut veneer, the core layer is bamboo curtain, or the bamboo curtain and the first log rotary-cut veneer arranged at intervals;

7. Pre-pressing: pre-pressing the slab;

8. Aging: aging treatment of the pre-pressed slab;

9. Hot pressing: hot pressing the pre-pressed and aged slab;

10. Edge trimming: After cooling the hot-pressed slab, trim the edge according to the predetermined size;

11. Sanding and grading: Sanding and grading the cut plywood.

Wherein, in the above-mentioned manufacturing method, steps 1-4 are the manufacturing process steps of the first log rotary-cut veneer, the second log rotary-cut veneer, bamboo mat and/or bamboo curtain; The first log rotary-cut veneer of molding, the second log rotary-cut veneer, bamboo mat and/or bamboo curtain etc. are processed, but, step 1-4 is not in the manufacture process of the bamboo-wood composite plywood provided by the invention Necessary steps.

Embodiment 1, moso bamboo, fir composite concrete building template

As shown in Figure 1, the concrete building formwork (i.e. bamboo-wood composite plywood, also known as bamboo-fir composite concrete building formwork) includes nine layers, the surface layer of the slab is a bamboo mat 1 with a thickness of 1.1 mm, and the subsurface layer is 2.5 mm thick. mm thick fir veneer (the first log rotary cut veneer) 2, the middle five layers (core layer) are 1.1 mm thick bamboo curtain 3 and 2.5 mm thick fir veneer 2, it can be seen from the section that each The material of the layer; the thickness of the concrete building template obtained by hot pressing the slab is 12 mm.

The production method of the composite concrete building template provided by the present embodiment may include the following specific steps:

1. Saw cutting and rotary cutting: Saw Chinese fir into fir wood sections according to a predetermined size, and rotary cut them into Chinese fir veneers with a thickness of 2.5 mm (i.e. the first log rotary veneer) 2;

2. Bamboo mat and bamboo curtain processing: cut moso bamboo, cut bamboo, remove knots, remove green and yellow, and cut strips to process bamboo mat 1 and bamboo curtain 3, with a thickness of 1.1 mm;

3. Drying: use drying equipment to dry the fir veneer 2, bamboo mat 1 and bamboo curtain 3, so that the moisture content is about 8-10%;

4. Cutting: process the dried fir veneer 2, bamboo mat 1 and bamboo curtain 3 into predetermined sizes;

5. Glue adjustment and gluing: add 8% flour (based on the weight of the glue) in the phenolic resin glue and stir evenly, then double-sided gluing is carried out to the fir veneer 2, and the gluing amount is 380g/m ² ;

6. Blank assembly: Arrange fir veneer 2, bamboo mat 1 and bamboo curtain 3 alternately to obtain a slab, the surface layer of the slab is bamboo mat 1, the subsurface layer is glued fir veneer 2, and the middle five layers are arranged at intervals Two-layer fir veneer 2 and three-layer bamboo curtain 3;

7. Pre-pressing: pre-press the slab at room temperature, the pre-pressing pressure is 0.8MPa, and the time is 20 minutes;

8. Age: age the pre-pressed slab for about 120 minutes;

9. Hot pressing: at a temperature of 135°C, perform two-stage hot pressing on the pre-pressed and aged slabs sequentially. The first hot-pressing conditions are: hot-pressing pressure 2.5 MPa, and the duration of pressing is 20 minutes; The second hot-pressing conditions are: hot-pressing pressure 0.3MPa, pressure duration 3 minutes;

10. Edge trimming: After cooling the hot-pressed slab, trim the edge according to the predetermined size;

11. Sanding and grading: Sanding and grading the cut plywood.

Performance test:

The bamboo-fir composite concrete building template provided in this example has a density of 0.70g/cm ³ , and its performance far exceeds the requirements of GB/T17656-1999. The specific performance test results are shown in Table 1.

Table 1, the performance inspection data of the Bamboo-fir composite concrete building formwork of the present embodiment

GB/T17656-1999 Bamboo fir composite concrete building formwork moisture content 6.0-14.0% 8.0% Modulus of elasticity along the grain 5500MPa 7500MPa Stripe elastic modulus 3500MPa 4100MPa Bending strength along the grain 26MPa 65MPa Static bending strength of transverse stripes 20MPa 47MPa

Embodiment 2, moso bamboo, poplar composite concrete building template

As shown in Figure 1, this concrete building template (i.e. bamboo-wood composite plywood, also can be referred to as bamboo-poplar composite concrete building template) comprises nine layers, and the surface layer of its slab is a bamboo mat 1 with a thickness of 1.1 mm, and the subsurface layer is 2.5 mm thick. mm thick poplar veneer (the first log rotary cut veneer) 2, the middle five layers (core layer) are 1.1 mm thick bamboo curtain 3 and 2.5 mm thick poplar veneer 2, as can be seen from the cross section The material of each layer; the plywood obtained by hot pressing the slab has a thickness of 12 mm.

The production method of the composite concrete building template provided by the present embodiment may include the following specific steps:

1. Sawing and rotary cutting: the poplar is sawed into poplar wood sections according to the predetermined size, and rotary cut into poplar veneer (the first log rotary veneer) 2 with a thickness of 2.5 mm;

2. Bamboo mat and bamboo curtain processing: cut moso bamboo, cut bamboo, remove knots, remove green and yellow, and cut strips to process bamboo mat 1 and bamboo curtain 3, with a thickness of 1.1 mm;

3. Drying: use drying equipment to dry poplar veneer 2, bamboo mat 1 and bamboo curtain 3, so that the moisture content is about 8-10%;

4. Cutting: process poplar veneer 2, bamboo mat 1 and bamboo curtain 3 into predetermined sizes;

5. Glue adjustment and gluing: add 8% (based on the weight of the glue) flour to the phenolic resin glue and stir well, then apply gluing on both sides of the poplar veneer 2, the amount of gluing is 380g/ ^m2 ;

6. Blank assembly: Arrange poplar veneer 2, bamboo mat 1 and bamboo curtain 3 staggeredly to obtain a slab. The surface layer of the slab is bamboo mat 1, the subsurface layer is glued poplar veneer 2, and the middle five layers are Two layers of poplar veneers 2 and three layers of bamboo curtains 3 arranged at intervals;

7. Pre-pressing: pre-press the slab at room temperature, the pre-pressing pressure is 0.8MPa, and the time is 20 minutes;

8. Age: age the pre-pressed slab for about 120 minutes;

9. Hot pressing: at a temperature of 145°C, perform two-stage hot pressing on the pre-pressed and aged slabs sequentially. The first hot-pressing conditions are: hot-pressing pressure 2.5 MPa, and the duration of pressing is 20 minutes; The second hot-pressing conditions are: hot-pressing pressure 0.3MPa, pressure duration 3 minutes;

10. Edge trimming: After cooling the hot-pressed slab, trim the edge according to the predetermined size;

11. Sanding and grading: Sanding and grading the cut plywood.

Performance test:

The bamboo and poplar composite concrete building formwork provided in this example has a density of 0.70g/cm ³ , and its performance far exceeds the requirements of GB/T17656-1999. The specific performance test results are shown in Table 2.

Table 2, the performance inspection data of the bamboo poplar composite concrete building formwork of the present embodiment

GB/T17656-1999 Bamboo Poplar Composite Concrete Building Formwork moisture content 6.0-14.0% 8.0% Modulus of elasticity along the grain 5500MPa 6500MPa Stripe elastic modulus 3500MPa 3800MPa Bending strength along the grain 26MPa 60MPa Static bending strength of transverse stripes 20MPa 38MPa

Embodiment 3, moso bamboo, fir composite concrete building template

As shown in Figure 2, the concrete building formwork (i.e. bamboo-wood composite plywood, also known as bamboo-fir composite concrete building formwork) includes seven layers, and the surface layer of the slab is a 1.5 mm thick Chinese fir veneer (the second log spinner cut veneer) 4, the subsurface layer is 2.5 mm thick fir veneer (the first log rotary cut veneer) 2, the middle three layers (core layer) are two layers of 4.3 mm thick bamboo curtains 3 and one layer 2.5 mm thick Chinese fir veneer 2, the material of each layer can be seen from the section; the thickness of the concrete building formwork obtained by hot pressing the slab is 15 mm.

The production method of the composite concrete building template provided by the present embodiment may include the following specific steps:

1. Saw cutting and rotary cutting: the Chinese fir is sawed into fir wood sections according to a predetermined size, and then rotary cut into fir veneers (i.e. the second log rotary veneer) with a thickness of 1.5 mm and 2.5 mm fir veneers ( That is, the first log rotary cut veneer) 2;

2. Bamboo curtain processing: cut moso bamboo, cut bamboo, remove knots, remove green and yellow, and cut strips to process bamboo curtain 3, with a thickness of 4.3 mm;

3. Drying: use drying equipment to dry the fir veneer 2, 4 and bamboo curtain 3, so that the moisture content is about 8-10%;

4. Cutting: process the dried fir veneer 2, 4 and bamboo curtain 3 into a predetermined size;

5. Glue adjustment and gluing: add 8% (based on the weight of the glue) flour in the phenolic resin glue and stir well, then apply gluing to both sides of the fir veneer 2 with a thickness of 2.5 mm, and the amount of gluing is 400g /m ² ;

6. Blank assembly: Arrange fir veneers and bamboo curtains alternately to obtain slabs. The surface layer of the slab is fir veneer 4 with a thickness of 1.5 mm, the subsurface is glue-coated fir veneer 2, and the middle three layers are arranged at intervals. Two layers of bamboo curtains 3 and one layer of fir veneer 2;

7. Pre-pressing: pre-press the slab at room temperature, the pre-pressing pressure is 0.8MPa, and the time is 20 minutes;

8. Age: age the pre-pressed slab for about 120 minutes;

9. Hot pressing: at a temperature of 145°C, perform two-stage hot pressing on the pre-pressed and aged slabs sequentially. The first hot-pressing conditions are: hot-pressing pressure 2.0MPa, and the duration of pressing is 24 minutes; The second hot-pressing conditions are: hot-pressing pressure 0.3MPa, pressure duration 3 minutes;

10. Edge trimming: After cooling the hot-pressed slab, trim the edge according to the predetermined size;

11. Sanding and grading: Sanding and grading the cut plywood.

Performance test:

The bamboo-fir composite concrete building template provided in this example has a density of 0.65g/cm ³ , and its performance far exceeds the requirements of GB/T17656-1999. The specific performance test results are shown in Table 3.

Table 3, the performance inspection data of the Bamboo-fir composite concrete building formwork of the present embodiment

GB/T17656-1999 Bamboo fir composite concrete building formwork moisture content 6.0-14.0% 8.0% Modulus of elasticity along the grain 5500MPa 7000MPa Stripe elastic modulus 3500MPa 4000MPa Bending strength along the grain 26MPa 60MPa Static bending strength of transverse stripes 20MPa 45MPa

Claims (15)

1. A bamboo-wood composite plywood, which has a body made of the first log rotary-cut veneer and bamboo curtain interval blanks, which is made by hot pressing. The body has an odd number of layers, and the first log rotary-cut veneer on the surface of the body. 2. The bamboo-wood composite plywood as claimed in claim 1, wherein a layer of bamboo mat is compounded on the two surfaces of the body to form the surface layer of the bamboo-wood composite plywood. 3. The bamboo-wood composite plywood according to claim 1, wherein a layer of second log rotary-cut veneer is composited on the two surfaces of the body to form the surface layer of the bamboo-wood composite plywood. 4. The bamboo-wood composite plywood according to claim 2 or 3, wherein the surface layer of the bamboo-wood composite plywood is coated with impregnated paper. 5. The bamboo-wood composite plywood according to claim 1, wherein the logs include one or more of fast-growing poplar, masson pine, larch, Chinese fir and eucalyptus. 6. The bamboo-wood composite plywood according to claim 1, wherein the thickness of the first log rotary-cut veneer is 1.5-8.0 mm. 7. The bamboo-wood composite plywood according to claim 1, wherein the thickness of the bamboo curtain is 1.0-4.5mm. 8. The bamboo-wood composite plywood according to claim 2, wherein the thickness of the bamboo mat is 0.5-2.5 mm. 9. The bamboo-wood composite plywood according to claim 1, wherein the thickness of the bamboo-wood composite plywood is 9-28mm. 10. The bamboo-wood composite plywood according to claim 1, wherein the bamboo-wood composite plywood has 3-21 layers. 11. The manufacturing method of bamboo-wood composite plywood according to claim 1, which comprises the following steps: According to the odd-numbered layer billet method, the first log rotary-cut veneer with a thickness of 1.5-8.0 mm and a moisture content of 6%-12% is separated from the bamboo curtain with a thickness of 1.0-4.5 mm and a moisture content of 6%-12%. Setting, slabs are obtained through gluing and billet assembly, and the gluing surface is the gluing surface of the first log rotary-cut veneer; Pre-pressing the slab at room temperature; Carry out aging treatment on the pre-pressed slab; Hot-press the pre-pressed and aged slabs. 12. The manufacturing method according to claim 11, wherein the method further comprises: Set bamboo mat or second log rotary-cut veneer on the two surfaces of the slab; Moreover, double-sided gluing is performed on the first log rotary-cut veneer during the billet assembly process. 13. The manufacturing method according to claim 11 or 12, wherein the method further comprises: The impregnated paper is pasted on the surface layer of the bamboo-wood composite plywood obtained by hot pressing. 14. The manufacturing method according to claim 11, wherein when applying glue, the amount of glue applied is 260-400g/m ² . 15. The manufacturing method according to claim 11, wherein the hot pressing of the pre-pressed and aged slab means: at a temperature of 125°C-155°C, the pre-pressed and aged slab Carry out two-stage hot-pressing in sequence, the first-stage hot-pressing conditions are: hot-pressing pressure 1.2-4.0MPa, pressure duration 1.0-2.0min/mm, based on the thickness of the slab without pre-pressing; the second The hot pressing conditions of the stage are: hot pressing pressure 0.3-0.6 MPa, time 1-3 minutes.

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