CN113561274A - Manufacturing method of light magnetic wood composite section - Google Patents
Manufacturing method of light magnetic wood composite section Download PDFInfo
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- CN113561274A CN113561274A CN202110817916.6A CN202110817916A CN113561274A CN 113561274 A CN113561274 A CN 113561274A CN 202110817916 A CN202110817916 A CN 202110817916A CN 113561274 A CN113561274 A CN 113561274A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27D—WORKING VENEER OR PLYWOOD
- B27D1/00—Joining wood veneer with any material; Forming articles thereby; Preparatory processing of surfaces to be joined, e.g. scoring
- B27D1/04—Joining wood veneer with any material; Forming articles thereby; Preparatory processing of surfaces to be joined, e.g. scoring to produce plywood or articles made therefrom; Plywood sheets
- B27D1/08—Manufacture of shaped articles; Presses specially designed therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27D—WORKING VENEER OR PLYWOOD
- B27D1/00—Joining wood veneer with any material; Forming articles thereby; Preparatory processing of surfaces to be joined, e.g. scoring
- B27D1/04—Joining wood veneer with any material; Forming articles thereby; Preparatory processing of surfaces to be joined, e.g. scoring to produce plywood or articles made therefrom; Plywood sheets
- B27D1/06—Manufacture of central layers; Form of central layers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
- B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
- B27N3/08—Moulding or pressing
- B27N3/10—Moulding of mats
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
- B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
- B27N3/08—Moulding or pressing
- B27N3/10—Moulding of mats
- B27N3/12—Moulding of mats from fibres
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Wood Science & Technology (AREA)
- Forests & Forestry (AREA)
- Mechanical Engineering (AREA)
- Dry Formation Of Fiberboard And The Like (AREA)
Abstract
本申请实施例公开了一种质轻磁力木质复合型材的制造方法，包括结构层的制备工序，所述结构层的制备工序按照生产顺序依次包括以下生产步骤：S1.备料的步骤，S2.拌胶的步骤，S3.质轻材料共混的步骤，其中质轻材料为至少由水冷冻成型的冰球，S4.铺料的步骤，S5.热压的步骤。借由上述方法，能够较为高效的制造用以作为基础层材料的结构层，且结构层各处(厚度各处、宽度各处、长度各处)的力学强度相对均匀一致。
The embodiment of the present application discloses a method for manufacturing a light-weight magnetic wood composite profile, which includes a preparation process of a structural layer, and the preparation process of the structural layer includes the following production steps in order of production: S1. Step of preparing materials, S2. Mixing The step of gluing, S3. the step of blending light-weight materials, wherein the light-weight material is at least ice balls formed by freezing with water, S4. the step of spreading materials, and S5. the step of hot pressing. With the above method, the structural layer used as the material of the base layer can be manufactured more efficiently, and the mechanical strength of the structural layer is relatively uniform throughout (thickness, width, and length).
Description
Technical Field
The invention relates to the technical field of wood composite material preparation, in particular to a manufacturing method of a light magnetic wood composite section.
Background
The magnetic plate is one of common manufacturing materials of civil furniture, commercial furniture and furniture for public transportation, and is used for providing adsorption force for magnetic blocks or magnetic pastes for office use and the like. In the prior art, an iron plate is attached to the bottom surface or the core layer of a wood composite material to manufacture a magnetic wood composite plate. However, there are problems of relatively large density (heavy weight) and relatively high cost.
In particular, if the hollow plate material of the prior art is used as the base material (for supporting the magnetic adsorption material layer), the manufacturing cost is relatively high or the strength is not uniform. Specifically, if the cellular board is used as a light-weight base layer material, firstly, the cellular board is relatively high in cost, and meanwhile, a strength layer (generally a high-density board with a thickness of 2 mm) needs to be covered on the cellular board, so that the cost of the product is further increased; if the frame-type artificial board is used as a light base layer material, the artificial board needs to be hollowed out, the material waste is large, and the mechanical strength of the hollowed-out part is relatively low.
Disclosure of Invention
The invention aims to overcome the technical problems, and provides a manufacturing method of a light magnetic wood composite profile.
In order to achieve the above object, an embodiment of the present invention provides a method for manufacturing a light magnetic wood composite profile, including a preparation process of a structural layer, where the preparation process of the structural layer sequentially includes the following production steps according to a production sequence:
s1, preparing materials,
s2, a step of glue mixing,
s3, blending the light materials, wherein the light materials are ice balls frozen and formed at least by water,
s4, a step of spreading materials,
s5, hot pressing.
By the method, the lightweight structural layer is synchronously finished when the wood composite material is prepared, the structural layer used as the material of the base layer can be efficiently manufactured, and the mechanical strength of each part (thickness, width and length) of the structural layer is relatively uniform and consistent. Specifically, after the ice hockey, a wood fiber material (primary raw material) and an adhesive are blended, in the step of hot pressing, the light material is melted while the adhesive is cured, a spherical hole is formed at the original position of the light material, and the melted water of the light material is transferred and permeated into the structural layer material under the action of the moisture content gradient and the temperature gradient. From this, can be comparatively efficient manufacturing with the structural layer that has the light hole of matter, and the mechanical strength of this kind of structural layer each department is even unanimous relatively to need not to use the intensity layer in order to improve the bulk strength of magnetic force wooden composite section bar, or reduce the thickness of the intensity layer who uses.
Preferably, the ice ball has a particle size of 0.2mm to 2.0 mm.
Preferably, the putting amount of the ice hockey accounts for 10-50% of the total volume of the structural layer.
Preferably, the lightweight material is ice balls formed by blending water and epoxy resin and freezing.
Preferably, in the lightweight material, the adding mass ratio of water to the epoxy resin is (1-5.5): 1.
Preferably, in the step of stirring the glue, the used adhesive is a solid soy protein adhesive, and the secondary raw material after stirring the glue is cooled to 25-35 ℃.
Preferably, in the step of preparing the stock, the raw material used is wood shavings or fibers.
Preferably, in the step of spreading, a bottom layer of secondary raw materials is firstly spread, and then the secondary raw materials and the light materials respectively fall at a constant speed.
Preferably, the thickness of the bottom layer secondary raw material accounts for 10% -15% of the total thickness of the structural layer.
Preferably, in the step of hot pressing, the following sub-stages are included:
s5-1, a first hot pressing stage, wherein a hot pressing structure contacts the three-stage raw material after spreading under pressure, the temperature of the hot pressing structure is 100-120 ℃, the pressure is 0.3-0.6 MPa, the processing time is 30-90S,
s5-2, in the slow release stage, the hot-pressing structure contacts the spread three-stage raw material under pressure, the temperature of the hot-pressing structure is 100-120 ℃, the pressure is 0.5-0.7 MPa, the processing time is 10-20S,
s5-3, in the second hot pressing stage, the hot pressing structure contacts the three-stage raw material after spreading under pressure, the temperature of the hot pressing structure is 180-200 ℃, the pressure is 1.0-1.5 MPa, the processing time is 30-150S,
s5-4, adjusting the water content, contacting the three-stage raw material after spreading with pressure by a hot-pressing structure, wherein the hot-pressing structure has the pressure of 0.2-0.3 MPa, the temperature is rapidly reduced to 60-70 ℃, and the processing time is 30-150S.
In summary, compared with the prior art, the invention has the beneficial effects that:
1. through the arrangement of the step of blending the light materials, the structural layer used as the material of the base layer can be manufactured more efficiently, and the mechanical strength of each part (thickness, width and length) of the structural layer is relatively uniform, so that a strength layer is not needed to be used for improving the overall strength of the magnetic wood composite section or the thickness of the used strength layer is reduced (for example, only a high-density board with the thickness of 1mm is used);
2. the lightweight material is an ice ball formed by blending water and epoxy resin, so that the epoxy resin is migrated into the structural layer material around the approximately spherical hole while the lightweight material is melted and water in the lightweight material is migrated and permeated into the structural layer material, so as to be blended with the solid soy protein adhesive to form a mixed adhesive, and the bonding strength around the spherical hole, namely the structural strength of a finished product, can be enhanced, and the uniformity of the mechanical strength of the structural layer material at each position is further ensured;
3. the secondary raw materials fall and are tiled firstly, so that the light materials can be effectively distributed in the secondary raw materials uniformly;
4. through two-stage hot pressing and the slow release stage arranged in the two hot pressing stages, the formation of spherical holes can be effectively facilitated, and the migration and permeation of the epoxy resin in the structural layer material around the approximately spherical holes are relatively uniform.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without inventive exercise.
FIG. 1 is a schematic front view of a structural layer according to an embodiment of the present invention;
fig. 2 is a cross-sectional view taken at a-a in fig. 1.
In the figure: 400-structural layer, 410-spherical cavity, 420-partial spherical cavity.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Example 1: the manufacturing method of the light magnetic wood composite profile comprises a preparation process of a structural layer 400, wherein the preparation process of the structural layer 400 sequentially comprises the following production steps according to the production sequence:
s1, preparing materials,
s2, a step of glue mixing,
s3, blending the light materials,
s4, a step of spreading materials,
s5, hot pressing.
In S1, in the step of preparing materials, wood shavings are used as a primary raw material, and the primary raw material is dried until the moisture content is 6% -12%, such as 8% (+ -0.5%). In other embodiments, wood fibers may also be used as the primary raw material.
S2, in the step of glue mixing, the adopted adhesive is a solid soy protein adhesive, and the ratio of the wood shavings to the solid soy protein adhesive is in a conventional ratio; the glue mixing mode can be any one of the modes in the prior art, for example, a drum mixer is used for glue mixing. And after the glue mixing treatment, cooling the secondary raw material (the mixture of the wood shavings and the solid soy protein adhesive) after the glue mixing to 25-35 ℃ (room temperature).
In S3, in the step of blending the light materials, the light materials are ice balls formed by freezing water, the particle size of the formed ice balls is 0.2-2.0 mm, in the embodiment, the particle size of the formed ice balls is 0.8-1.6 mm, and the technical scheme of the application has no requirement on the consistency of the particle sizes of the ice balls. The putting amount of the ice ball accounts for 10% -50% of the total volume of the structural layer, and in the embodiment, the putting amount of the formed ice ball accounts for 15% (+/-2%) of the total volume of the structural layer.
In the step of spreading, firstly, spreading bottom layer secondary raw materials by using any spreading machine in the prior art, wherein the thickness of the bottom layer secondary raw materials accounts for 10% -15% of the total thickness of the structural layer 400, and in the embodiment, the thickness of the bottom layer secondary raw materials accounts for 11% (± 0.5%) of the total thickness of the structural layer 400; after the second-level raw material at the bottom layer is laid, the other material laying machine synchronously discharges the light material with the second-level raw material, and the light material and the second-level raw material fall synchronously at a constant speed so as to lay the mixed material of the second-level raw material and the light material on the second-level raw material at the bottom layer. Meanwhile, the lightweight material further sinks under the action of gravity, so that a mixed material (tertiary raw material) of the secondary raw material and the lightweight material can be formed after the material is spread, and the lightweight material is distributed relatively uniformly in the whole thickness direction of the tertiary raw material.
S5, the step of hot pressing comprises the following sub-stages:
s5-1, a first hot pressing stage, wherein a hot pressing structure contacts the three-stage raw material after spreading under pressure, the temperature of the hot pressing structure is 115 ℃ (± 1 ℃), the pressure is 0.58MPa (+ -0.2 MPa), and the treatment time is 40S,
s5-2, in the slow release stage, the hot-pressing structure contacts the three-level raw material after spreading under pressure, the temperature of the hot-pressing structure is 115 ℃ (± 1 ℃), the pressure is 0.68MPa (+ -0.2 MPa), the processing time is 10S,
s5-3, in the second hot pressing stage, a hot pressing structure contacts the three-level raw material after spreading under pressure, the temperature of the hot pressing structure is 185 ℃ (± 2 ℃), the pressure is 1.2MPa (+ -0.2 MPa), and the processing time is 50S,
s5-4, in the stage of adjusting the water content, the hot-pressing structure contacts the spread three-stage raw material under pressure, the pressure of the hot-pressing structure is 0.2MPa, the temperature is rapidly reduced to 65 ℃, the processing time is 50S, the rapid temperature reduction can be realized by a pressing plate or a roller which is filled with condensed water, and the temperature reduction speed is 3-5 ℃/min.
Specifically, in the first hot pressing stage of S5-1, the solid soy protein adhesive can be initially cured and have a certain strength (which can reach about 30% -35% of the adhesive strength of the solid soy protein adhesive) at a relatively low hot pressing temperature and a relatively low hot pressing pressure, and the lightweight material is melted.
At the stage of S5-2, in the slow release, a preliminary form of spherical hole is formed at the original position of the light material along with the melting of the light material, and the melted water of the light material migrates and permeates into the material of the structural layer 400 under the action of the moisture content gradient and the temperature gradient.
At S5-3, in the second hot pressing stage, the solid soy protein adhesive is completely cured and molded to form the structural layer 400, and approximately elliptical spherical holes 410 are formed, wherein the short axis direction of the holes is the same as the thickness direction of the structural layer 400. In particular, the light material partially blended in the secondary raw material forms partially spherical holes 420 on the surface and bottom of the structural layer 400 after melting.
At the stage of adjusting the water content at S5-4, the water in the melted lightweight material is made to uniformly migrate and permeate into the material of the structural layer 400 around the spherical holes 410 and the partial spherical holes 420.
Through the above process, the structure of the structural layer 400 shown in fig. 1 and 2 can be formed.
The hot press structure used in the stages S5-1 to S5-4 may be a hot press plate or a hot roller in any manner known in the art.
The method for manufacturing the light magnetic wood composite profile of the embodiment further includes the step of gluing and compounding the surface layer, the magnetic layer, the bottom layer and the structural layer 400. Wherein, the surface layer is a fireproof plate with the thickness of 0.2mm, the magnetic layer is a galvanized iron plate with the thickness of 0.2mm, and the bottom layer is a rotary-cut single plate with the thickness of 0.2 mm. Thereby preparing a composite layer which comprises the following mutually bonded layers from top to bottom in sequence: a surface layer, a magnetic layer, a structural layer 400, a magnetic layer and a bottom layer; the layers are compounded by hot melt adhesive.
Example 2: example 2 differs from example 1 in that,
the lightweight material is an ice ball formed by blending and freezing water and epoxy resin, wherein the adding mass ratio of the water to the epoxy resin is (1-5.5): 1, and in the embodiment, the adding mass ratio of the water to the epoxy resin is (2.3-2.6): 1. The particle size of the formed ice ball is 0.5 mm-1.1 mm. The molded ice hockey is put in 35% (+ -3%) of the total volume of the structural layer.
The thickness of the bottom layer secondary raw material accounts for 14% (± 0.5%) of the total thickness of the structural layer 400.
S5, in the step of hot pressing, the technological parameters of each sub-stage are as follows:
s5-1, a first hot pressing stage, wherein a hot pressing structure contacts the three-stage raw material after spreading under pressure, the temperature of the hot pressing structure is 105 ℃ (± 1 ℃), the pressure is 0.32MPa (+ -0.2 MPa), and the treatment time is 80S,
s5-2, in the slow release stage, the hot-pressing structure contacts the three-level raw material after spreading under pressure, the temperature of the hot-pressing structure is 105 ℃ (± 1 ℃), the pressure is 0.52MPa (+ -0.2 MPa), the processing time is 20S,
s5-3, in the second hot pressing stage, a hot pressing structure contacts the three-level raw material after spreading under pressure, the temperature of the hot pressing structure is 195 ℃ (± 2 ℃), the pressure is 1.3MPa (+ -0.2 MPa), and the processing time is 130S,
and S5-4, adjusting the water content, and contacting the paved three-stage raw material with a hot-pressing structure under pressure, wherein the hot-pressing structure has the pressure of 0.3MPa, is rapidly cooled to 65 ℃, and has the treatment time of 140S.
In the S5-2 stage of slow release in this embodiment, the light material is melted to form an initial form of a spherical hole at its original position, and the epoxy resin is transferred to the structural layer material around the spherical hole while the light material is melted, and moisture therein is transferred and permeated into the structural layer material, so as to be blended with the solid soy protein adhesive to form the mixed adhesive. The bonding strength around the spherical hole, namely the structural strength of the finished product, can be enhanced, and the uniformity of the mechanical strength of each part of the structural layer material is further ensured.
In the second hot pressing stage of S5-3 of this embodiment, the solid soy protein adhesive and the epoxy resin adhesive mixed adhesive around the preliminary shape of the spherical hole are completely cured and molded to form the structural layer 400, and a spherical hole 410 close to an ellipse is formed, wherein the minor axis direction of the spherical hole is in the same direction as the thickness direction of the structural layer 400.
The product performance parameters of the lightweight magnetic wood composite profiles of example 1 and example 2 are shown in table 1. The control group was a commercially available magnetic wood composite board (brand homedapl). The test method is executed by referring to GB/T17657-2013 physicochemical property test method for artificial boards and decorative artificial boards.
TABLE 1 PRODUCT PERTIES PARAMETERS OF LIGHT-WEIGHT MAGNETIC WOOD COMPOSITE SHAPES OF EXAMPLE 1 AND EXAMPLE 2
| Group of | Density of | Impact resistance |
| Example 1 | 550kg/m3 | 8700N |
| Example 2 | 420kg/m3 | 9100N |
| Control group | 1300kg/m3 | 9300N |
The foregoing description is for the purpose of illustration and is not for the purpose of limitation. Many embodiments and many applications other than the examples provided will be apparent to those of skill in the art upon reading the above description. The scope of the present teachings should, therefore, be determined not with reference to the above description, but should instead be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled. The disclosures of all articles and references, including patent applications and publications, are hereby incorporated by reference for all purposes. The omission in the foregoing claims of any aspect of subject matter that is disclosed herein is not intended to forego the subject matter and should not be construed as an admission that the applicant does not consider such subject matter to be part of the disclosed subject matter.
Claims (10)
1. The manufacturing method of the light magnetic wood composite section is characterized by comprising a preparation process of a structural layer, wherein the preparation process of the structural layer sequentially comprises the following production steps according to the production sequence:
s1, preparing materials,
s2, a step of glue mixing,
s3, blending the light materials, wherein the light materials are ice balls frozen and formed at least by water,
s4, a step of spreading materials,
s5, hot pressing.
2. The method for manufacturing a lightweight magnetic wood composite profile according to claim 1, wherein the ice ball has a particle size of 0.2mm to 2.0 mm.
3. The manufacturing method of the lightweight magnetic wood composite profile according to claim 1, wherein the putting amount of the ice hockey accounts for 10-50% of the total volume of the structural layer.
4. The manufacturing method of the light magnetic wood composite profile according to claim 1, wherein the light material is ice balls formed by blending and freezing water and epoxy resin.
5. The manufacturing method of the light magnetic wood composite profile according to claim 4, wherein the weight ratio of water to epoxy resin in the light material is (1-5.5): 1.
6. The method for manufacturing a lightweight magnetic wood composite profile according to claim 1, wherein in the step of glue mixing, the adhesive used is a solid soy protein adhesive, and the secondary raw material after glue mixing is cooled to 25 ℃ to 35 ℃.
7. The method of claim 1, wherein the step of preparing the stock is performed by using wood shavings or fibers as raw materials.
8. The method of claim 1, wherein in the step of spreading, a bottom layer of secondary raw material is first spread, and then the secondary raw material and the light material fall at a constant speed.
9. The method of claim 8, wherein the thickness of the bottom layer secondary raw material is 10-15% of the total thickness of the structural layer.
10. The method of manufacturing a lightweight magnetic wood composite profile according to claim 1, comprising the following sub-stages in the step of hot pressing:
s5-1, a first hot pressing stage, wherein a hot pressing structure contacts the three-stage raw material after spreading under pressure, the temperature of the hot pressing structure is 100-120 ℃, the pressure is 0.3-0.6 MPa, the processing time is 30-90S,
s5-2, in the slow release stage, the hot-pressing structure contacts the spread three-stage raw material under pressure, the temperature of the hot-pressing structure is 100-120 ℃, the pressure is 0.5-0.7 MPa, the processing time is 10-20S,
s5-3, in the second hot pressing stage, the hot pressing structure contacts the three-stage raw material after spreading under pressure, the temperature of the hot pressing structure is 180-200 ℃, the pressure is 1.0-1.5 MPa, the processing time is 30-150S,
s5-4, adjusting the water content, contacting the three-stage raw material after spreading with pressure by a hot-pressing structure, wherein the hot-pressing structure has the pressure of 0.2-0.3 MPa, the temperature is rapidly reduced to 60-70 ℃, and the processing time is 30-150S.
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