Production method of heat insulation plate

Abstract

The invention belongs to the field of thermal insulation board production methods, and discloses a thermal insulation board production method which sequentially comprises the steps that a bottom layer non-woven fabric coiled material is unfolded and continuously and evenly laid on a laying conveying belt; longitudinally paving the bottom-layer wood shavings on the non-woven fabric by using a paving machine; then the core layer fine wood shavings are transversely laid on the bottom layer wood shaving layer; then the surface layer wood shavings are longitudinally laid on the core layer wood shavings; then, a surface glass fiber polyurethane cloth coiled material is unfolded and continuously and evenly laid on the surface wood shaving layer, and an unpressed plate blank is formed; and finally feeding the plate blank into a press for hot press molding to obtain a finished product. According to the process, through multi-layer directional paving and application of the non-woven fabric and the glass fiber polyurethane fabric, the structure and the heat insulation property are optimized, the steps are coherent, and the production efficiency and the product quality are improved.

Description

Technical Field

[0001] This invention belongs to the technical field of heat insulation board production methods, and more specifically, relates to a heat insulation board production method. Background Technology

[0002] In the field of building energy conservation and insulation, with increasingly stringent national green building standards and people's continuous pursuit of living comfort, the market demand for panels that combine high-efficiency thermal insulation performance with convenient construction characteristics remains strong. Currently, traditional thermal insulation panels mostly adopt a "sandwich" structure, that is, filling foam plastic or honeycomb core material between two OSB (oriented strand board) substrates. However, this traditional structure has many inherent defects in production and application, restricting its further promotion. From a production perspective, this process involves the independent production of multiple panels and the separate preparation of the core material, which are then combined through bonding or mechanical connection. The process is cumbersome, increasing the complexity of the production line and equipment investment, and making the production process lengthy, which is not conducive to improving efficiency and reducing costs. From an application perspective, the finished panels are relatively heavy, and because the core material and the panel material are different, problems such as delamination and cracking are prone to occur during secondary processing such as cutting and drilling, significantly increasing the difficulty of on-site construction, requiring higher worker skills, and indirectly driving up construction costs. In addition, organic core materials such as foam have poor fire-retardant properties, posing safety hazards, while replacing them with inorganic flame-retardant core materials will bring new challenges in terms of cost and process compatibility. Summary of the Invention

[0003] This application aims to provide a method for producing a heat insulation board, thereby solving the technical problems of numerous production processes and high production costs in the existing heat insulation board production technology.

[0004] To achieve the above objectives, the technical solution adopted in this application is as follows: A method for producing a heat insulation board is provided, comprising the following steps: S1: Lay the bottom non-woven fabric on the paving conveyor belt; S2: The mixed adhesive bottom layer of wood shavings is laid longitudinally on the bottom non-woven fabric to form the bottom layer of wood shavings. S3: The core layer shavings that have been mixed with adhesive are laid horizontally on the bottom shaving layer to form the core layer shaving layer; S4: The surface wood shavings that have been mixed with adhesive are laid longitudinally on the core wood shavings layer to form the surface wood shavings layer; S5: Lay fiberglass polyurethane cloth on the surface shavings layer to form a slab; S6: The blank is fed into a press for hot pressing to obtain an oriented strand board.

[0005] As a further improvement to the above technical solution: Optionally, the length of the bottom layer shavings and / or the surface layer shavings is 80mm-140mm, the width is 20mm-30mm, and the thickness is 0.5mm-0.8mm.

[0006] Optionally, the core layer shavings have a length of 10mm-40mm, a width of 5mm-15mm, and a thickness of 0.5mm-0.8mm.

[0007] Optionally, the bottom layer wood shavings and the top layer wood shavings are arranged and laid along the same longitudinal direction; the core layer wood shavings are arranged and laid along a transverse direction perpendicular to the longitudinal direction.

[0008] Optionally, the thermal conductivity of the glass fiber polyurethane cloth is 0.20-0.40 W / (m·K).

[0009] Optionally, during hot pressing, the slab is subjected to a process temperature of 190°C to 225°C and a pressure of 2 N / mm. 2 Up to 3.5 N / mm 2 Hot pressing time: 4-6 minutes. Attached Figure Description

[0010] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0011] Figure 1 This is a cross-sectional view of the OSB insulation panel structure; Figure 2 This is a structural schematic diagram of the paving equipment of this application.

[0012] The following are the labeling elements in the figure: 1. Base layer: non-woven fabric; 2. Base layer: wood shavings layer; 3. Core layer wood shavings; 4. Surface layer wood shavings; 5. Fiberglass polyurethane cloth; 6. Drive shaft installation; 7. Longitudinal paving machine; 8. Transverse paving machine. Detailed Implementation

[0013] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0014] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0015] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0016] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0017] Unless otherwise defined, all technical terms used herein have the same meaning as commonly understood by those skilled in the art. The technical terms used herein are for the purpose of describing particular embodiments only and are not intended to limit the scope of the invention.

[0018] This application provides a method for producing a heat insulation board, the core of which lies in the multi-layer, oriented, and heterogeneous material laying, combined with a specific substrate and surface layer, such as... Figure 1 As shown, an OSB (Oriented Strand Board) insulation board with excellent mechanical properties, thermal insulation properties, and environmental friendliness is finally obtained. The production method specifically includes the following steps: Step 1: Laying the bottom layer of non-woven fabric First, prepare a roll of bottom nonwoven fabric. In this embodiment, the bottom nonwoven fabric is preferably a heat-sealed nonwoven fabric roll, with a diameter of approximately 400 mm and a length of approximately 4800 mm. Figure 2As shown, this nonwoven fabric roll is mounted on a laying drive shaft 6, one side of which is equipped with a drive gearbox whose rotation speed is synchronized with the running speed of the downstream laying conveyor belt (not shown in the figure). After the production line is started, the nonwoven fabric roll is smoothly unrolled and pulled, and continuously and evenly laid on the laying conveyor belt running at a constant speed by its own weight or auxiliary rollers, forming the basic bearing surface of the entire slab. The bottom surface of this bottom nonwoven fabric is in direct contact with the conveyor belt, while the upper surface is covered with the bottom layer of wood shavings. This layer of nonwoven fabric not only plays a role in initial support and shaping, but its own breathable, lightweight, biodegradable, and low-cost characteristics, especially its preset waterproof and / or flame-retardant functions, provide preliminary functional protection for the final product.

[0019] Step 2: Laying the bottom layer of longitudinal wood shavings Next, the bottom layer of longitudinal wood shavings is laid. This bottom layer of shavings is preferably made from high-quality pine wood, processed using a long wood chipper. To ensure the uniformity of shaving dimensions and the quality of the laying, the long wood chips undergo rigorous drying to reduce moisture content, a screening process to remove dust and shavings that are too large or too small, and preliminary glue pretreatment. Qualified large-sized shavings, preferably 80-140mm in length (more preferably 140mm), 20-30mm in width (more preferably 25mm), and 0.5-0.8mm in thickness (more preferably 0.6mm), are transported to SL1 or SL3 silos specifically for storing these shavings.

[0020] In the laying stage, a longitudinal laying machine 7 is used. The laying head inside this machine combs and spreads the wood shavings from the hopper according to a predetermined direction and density. After the laying machine starts, the wood shavings are evenly spread on the upper surface of the bottom non-woven fabric formed in step one. This longitudinal laying machine ensures that the long side of most of the bottom wood shavings is aligned with the direction of travel of the laying conveyor belt (i.e., the future longitudinal direction of the board), forming an oriented layer of shavings. It should be noted that before entering the SL1 or SL3 hopper, the bottom wood shavings have been metered and sprayed with MDI adhesive through a mixing system. MDI adhesive, due to its advantages such as being formaldehyde-free, having high bonding strength, and good water resistance, is key to achieving green, high-performance boards.

[0021] Step 3: Laying out the core layer of fine wood shavings Subsequently, the fine wood shavings for the core layer are laid out. To fully utilize wood resources, reduce production costs, and achieve environmental protection goals, the core layer shavings are preferably made from small-diameter timber, branches, and other smaller timber. Their preparation requires two stages of fine processing: first, the logs are coarsely planed using a drum planer, and then finely planed and shaped using a ring planer to obtain finer, more uniform shavings. Similarly, the core layer shavings also need to undergo drying, screening, and glue mixing. The shaving size is preferably controlled within the range of 10-40mm in length (more preferably 10-30mm), 5-15mm in width (more preferably 5-10mm), and 0.5-0.8mm in thickness (more preferably 0.6mm). The processed shavings are then temporarily stored in a dedicated CL2 silo.

[0022] During installation, a transverse paving machine 8 is used. This machine differs from the longitudinal paving machine in that it combs and spreads the fine wood shavings from the CL2 hopper in a direction perpendicular to the conveyor belt's direction of travel (i.e., transverse to the board). These fine core wood shavings are evenly laid on top of the underlying longitudinal wood shaving layer formed in step two. This creates a preliminary "longitudinal-transverse" cross-stacked mechanical structure, which helps balance the internal stress of the board in different directions, improving its overall strength and dimensional stability. Similarly, before entering the CL2 hopper, the core wood shavings are metered and sprayed with MDI adhesive through a mixing system to ensure good adhesion between them and between them and the layers above and below.

[0023] Step 4: Laying the surface layer of longitudinal wood shavings After the core layer is laid, the surface layer of longitudinal wood shavings is laid. The raw materials, preparation process, dimensions (preferably 140mm long, 25mm wide, and 0.6mm thick), adhesive mixing (MDI glue), and hoppers (SL1 / SL3) for this surface layer are exactly the same as those for the bottom layer of longitudinal wood shavings in step two. During laying, the longitudinal laying machine used in step S2 is used again, or another identical machine is used. The surface layer of longitudinal wood shavings is evenly laid on top of the fine core layer of shavings formed in step S3, and its orientation is also consistent with the bottom layer of shavings, both being longitudinal. In this way, the two layers of large longitudinal shavings act like "skeletons" wrapping around the middle layer of fine transverse shavings, forming the classic "sandwich" oriented structure of OSB board, thus ensuring the board has excellent tensile and bending strength.

[0024] Step 5: Laying the surface layer of fiberglass polyurethane cloth and forming the slab. Finally, a functional reinforcing material—a surface layer of fiberglass polyurethane fabric—is laid on the top layer. This reinforcing fabric roll also has standard specifications, such as a diameter of approximately 400 mm and a length of approximately 4800 mm, and is mounted on another paving drive shaft. Its drive gearbox is also synchronized with the paving conveyor belt to ensure that the paving speed matches the layers below. The reinforcing fabric roll is unrolled and laid continuously and smoothly on top of the longitudinal wood shavings layer formed in step four, with its bottom surface in contact with the shavings layer. This surface layer of fiberglass polyurethane fabric is key to its thermal insulation performance, with an extremely low thermal conductivity, preferably in the range of 0.20-0.40 W / (m·K) (more preferably 0.22-0.34 W / (m·K)), far superior to traditional wood materials. Its addition acts as a highly efficient thermal insulation barrier, effectively blocking the transfer of heat between indoors and outdoors, significantly reducing building energy consumption.

[0025] Step Six: Hot Pressing and Post-processing After the slab is assembled, the entire slab is smoothly fed into a continuous hot press (or a periodic single / multi-layer press) via a conveyor belt. Inside the hot press, under the combined action of high temperature (usually 160℃-220℃) and high pressure, the MDI adhesive between the wood shavings is completely cured, and at the same time, a good composite bond is formed between the wood shavings and the non-woven fabric and fiberglass polyurethane cloth, thus forming a strong and dense integral slab.

[0026] The high-temperature sheet material ejected from the press needs to be cooled and sawn into standard-sized rough boards. Subsequently, the rough boards undergo a cooling and aging treatment stage, being left to stand in a natural or forced-ventilation environment for 24-72 hours or longer to fully release residual stress within the board, allow the moisture content to reach equilibrium with the ambient humidity, and stabilize its physical and mechanical properties. Finally, after all the above steps, the OSB heat-insulating and flame-retardant finished board described in this application is obtained.

[0027] In summary, this invention, through innovative material combinations and precise installation processes, successfully combines the excellent mechanical properties of OSB boards with the ultra-low thermal conductivity of fiberglass polyurethane cloth, and supplements them with functional non-woven fabrics, achieving a synergistic improvement in multiple properties such as heat insulation, flame retardancy, lightweight, and environmental protection. It has extremely high industrial application value and market prospects.

[0028] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A method for producing a heat insulation board, characterized in that, Includes the following steps: S1: Lay the bottom non-woven fabric (1) on the paving conveyor belt; S2: The mixed adhesive bottom layer shavings are laid longitudinally on the bottom non-woven fabric to form the bottom shavings layer (2). S3: The core layer shavings mixed with adhesive are laid horizontally on the bottom shaving layer to form the core layer shaving layer (3). S4: The surface wood chips that have been mixed with adhesive are laid longitudinally on the core wood chip layer to form the surface wood chip layer (4). S5: Lay the fiberglass polyurethane cloth (5) on the surface shavings layer to form a slab; S6: The blank is fed into a press for hot pressing to obtain an oriented strand board.

2. The production method as described in claim 1, characterized in that, The bottom layer shavings and / or the top layer shavings have a length of 80mm-140mm, a width of 20mm-30mm, and a thickness of 0.5mm-0.8mm.

3. The production method as described in claim 1, characterized in that, The core layer shavings are 10mm-40mm long, 5mm-15mm wide, and 0.5mm-0.8mm thick.

4. The production method as described in claim 1, characterized in that, The bottom layer wood shavings and the surface layer wood shavings are arranged and laid in the same longitudinal direction; the core layer wood shavings are arranged and laid in a transverse direction perpendicular to the longitudinal direction.

5. The production method as described in claim 1, characterized in that, The thermal conductivity of the fiberglass polyurethane cloth is 0.20-0.40 W / (m·K).

6. The production method as described in claim 1, characterized in that, When the slab enters the continuous hot pressing process, the process temperature is 190-225℃ and the pressure is 2N / mm. 2 Up to 3.5 N / mm 2 Hot pressing time: 4-6 minutes.

Images