CN1982771A - Composite sheet manufacturing method - Google Patents

Abstract

The invention discloses a manufacturing method of a composite board, which comprises the following steps: recovering (or preparing) at least one thermoplastic polymer resin raw material; heating the thermoplastic polymer resin raw material to form a thermoplastic polymer resin sheet; heating and sticking the thermoplastic polymer resin sheet on at least one surface of a wood sheet to form a unit plate body; and hot-pressing at least two unit plate bodies to form a composite plate. Alternatively, the thermoplastic polymer resin raw material may be directly solidified on the wood sheet to form a thermoplastic polymer resin sheet, and then directly combined into the unit plate. The manufacturing method of the composite board can reduce the cost of raw materials and increase the water resistance, the product safety, the transportation convenience, the stacking and positioning precision and the manufacturing yield of the composite board.

Description

Composite sheet manufacturing method

technical field

The invention relates to a manufacturing method of a composite board, in particular to a manufacturing method of a composite board that recycles various thermoplastic polymer resin materials to be combined with a wooden sheet to form a unit board body, thereby increasing waterproofness and manufacturing yield.

Background technique

The manufacturing method of commonly used composite panels, as shown in Figures 1A to 1G, mainly includes the following steps: as shown in Figure 1A, a log 90 is cut into a fixed length; as shown in Figure 1B, the log 90 is rolled into a wooden Sheet 91; As shown in Figure 1C, this wooden sheet 91 is cut into fixed length and width size, and is dried; As shown in Figure 1D, this wooden sheet 91 brushes a formaldehyde resin glue 92, and this formaldehyde resin glue 92 is in It is viscous at room temperature; as shown in Figure 1E, stack and position several pieces of the wood veneer 91 to initially bond into a pre-assembled body 93; as shown in Figure 1F, this pre-assembled body 93 is sent into a molding die 94 Carry out thermocompression bonding; as shown in FIG. 1G , open the molding die 94 to take out a composite plate 95 . Finally, the composite plate 95 is subjected to initial quality inspection, cutting, finished product inspection, packaging and delivery.

Generally speaking, the above-mentioned common manufacturing method of the composite board has the following disadvantages, for example: the wood veneers 91 are bonded to form the composite board 95 by the adhesiveness of the formaldehyde resin glue 92 . However, the finished product of the composite plate 95 will continue to release a small amount of formaldehyde gas after leaving the factory, so it may not only cause harm to the human body, but also fail to meet increasingly stringent environmental protection standards. Furthermore, the formaldehyde resin glue 92 in the composite board 95 is not waterproof, so if it encounters a humid or watery environment, it is easy to debond, resulting in loose structure and relatively reduced service life.

In addition, as shown in Figure 1d, when a formaldehyde resin glue 92 is brushed on the wood veneer 91, the coating thickness of the formaldehyde resin glue 92 is usually very thin, which cannot fill the fiber pores of the wood veneer 91, and brushing easily occurs. The problem of uneven coating can easily affect the quality of subsequent heat pressing. At the same time, since the formaldehyde resin glue 92 has great viscosity at normal temperature, when stacking and positioning the wood veneers 91, if the wood veneers 91 are displaced but come into contact, they will easily adhere closely to each other, resulting in stacking. The inconvenience of positioning. In addition, during product inspection, if the composite board 95 is found to be poorly bonded, the wood veneers 91 are tightly glued and cannot be re-stacked for positioning, so that the entire composite board 95 must be scrapped, which wastes raw materials and reduces yield. , and also cause environmental problems in the disposal of scrap materials. Based on the above reasons, it is necessary to further improve the manufacturing method of the above-mentioned commonly used composite panels.

Contents of the invention

The main purpose of the present invention is to provide a method for manufacturing composite boards, which recycles various thermoplastic polymer resin raw materials so as to pre-combine with a wooden sheet into a unit board for subsequent manufacturing of composite boards, so that the present invention has the advantage of reducing the cost of raw materials effect.

The secondary purpose of the present invention is to provide a method for manufacturing composite boards. The thermoplastic polymer resin flakes on the unit boards are insoluble in water, so that the invention has the effect of increasing the waterproof and moisture resistance of the composite boards.

Another object of the present invention is to provide a method for manufacturing a composite plate, the thermoplastic polymer resin sheet on the unit plate body does not contain formaldehyde, so that the present invention has the effect of increasing the product safety of the composite plate.

Another object of the present invention is to provide a method for manufacturing composite boards. The thermoplastic polymer resin sheets on the unit boards form glue nails embedded in the fibers of the wood sheets, so that the present invention has the advantages of increasing the structural strength and convenience of transportation of the composite boards. effect.

Another object of the present invention is to provide a method for manufacturing composite boards. The thermoplastic polymer resin sheets on the unit boards are not sticky at room temperature, so that the present invention has the effect of increasing the stacking positioning accuracy of composite boards.

According to a preferred embodiment of the present invention, the manufacturing method of the composite board includes the steps of: recovering (or preparing) at least one thermoplastic polymer resin raw material; heat-treating the thermoplastic polymer resin raw material into a thermoplastic polymer resin sheet; using the thermoplastic polymer resin The sheet is heated and pasted on at least one surface of a wooden sheet to form a unit board body; and at least two of the unit board bodies are hot-pressed to form a composite board.

According to another preferred embodiment of the present invention, the manufacturing method of the composite board comprises the steps of: reclaiming (or preparing) at least one thermoplastic polymer resin raw material; heating and coating the thermoplastic polymer resin raw material on at least one surface of a wood veneer, The thermoplastic polymer resin raw material is formed into a thermoplastic polymer resin sheet, which is combined with the wood sheet to form a unit board body; and at least two of the unit board bodies are hot-pressed to form a composite board.

By recycling various thermoplastic polymer resin raw materials, choose to prefabricate a thermoplastic polymer resin sheet, and then combine with a wooden sheet to form a unit board; or, choose the thermoplastic polymer resin raw material to be directly cured on a wooden sheet to form a thermoplastic polymer resin sheets, and then directly combined into a unit board. The thermoplastic polymer resin sheet is insoluble in water, does not contain formaldehyde, is not viscous at room temperature, and can increase the structural strength of the unit board, making it suitable for long-distance transportation, and can choose the number of stacked layers according to requirements for follow-up thermocompression bonding process. Therefore, the present invention can reduce the cost of raw materials, and increase the waterproofness, product safety, convenience of transportation, stacking positioning accuracy and manufacturing yield of the composite board.

Description of drawings

FIG. 1A to FIG. 1G : schematic flow charts of common manufacturing methods for composite panels.

Figure 1d: Partial enlarged view of commonly used wood veneers brush-coated with formaldehyde resin glue.

Fig. 2: A flow block diagram of the manufacturing method of the composite plate according to the first embodiment of the present invention.

3A to 3H : schematic flow charts of the manufacturing method of the composite plate according to the first embodiment of the present invention.

Fig. 3e: A partially enlarged view of thermocompression-bonded thermoplastic polymer resin sheets of wood veneers according to the first embodiment of the present invention.

FIG. 4 : Another schematic diagram of the manufacturing process of the unit board in the first embodiment of the present invention.

Fig. 5: A flow block diagram of the manufacturing method of the composite plate according to the second embodiment of the present invention.

Fig. 6: Schematic flow chart of the manufacturing method of the composite plate according to the second embodiment of the present invention.

Detailed ways

In order to make the above and other objects, features and advantages of the present invention more clearly understood, preferred embodiments of the present invention will be exemplified below in detail with accompanying drawings.

As shown in FIG. 2 , the manufacturing method of the composite panel according to the first embodiment of the present invention includes steps: a resin recovery step S1 , a resin thinning step S2 , a unit panel step S3 and a thermal pressing step S4 . The resin recycling step S1 can be optionally executed or not executed, which is: recycling (or preparing) at least one thermoplastic polymer resin raw material. The resin sheeting step S2 is: heat-treating the thermoplastic polymer resin raw material to form a thermoplastic polymer resin sheet. The step S3 of the unit panel is: heating and pasting the thermoplastic polymer resin sheet on at least one surface of a wooden sheet to form a unit panel. The thermocompression bonding step S4 is: thermocompression bonding at least two of the unit panels to form a composite panel.

As shown in Fig. 2, Fig. 3A and Fig. 3B, the step S1 of recovering resin in the manufacturing method of the composite board according to the first embodiment of the present invention is: recovering (or preparing) at least one thermoplastic polymer resin raw material 10 . More specifically, according to product requirements, the present invention is preferably obtained from recycled thermoplastic polymer resin raw materials 10 , but it can also be obtained from new thermoplastic polymer resin raw materials (not shown). The recycled source of the thermoplastic polymer resin material 10 is selected from at least one of film-like recycled raw materials and non-film-like recycled raw materials. For example, the film-like recycled raw material can be selected from film for crop shading, film for greenhouse shading, film for industrial packaging, or various plastic bags. The non-film recycled raw materials can be selected from braided packaging tapes, plastic pipe fittings, or various household/industrial plastic products. The above-mentioned recycled thermoplastic polymer resin raw material 10 is preferably selected from thermoplastic polymer resins that are solid and non-viscous at room temperature, such as polyethylene [PE], polypropylene [PP], polyethylene terephthalate [PET], Polyvinyl chloride [PVC], acrylonitrile/butadiene/styrene copolymer [ABS] or polycarbonate [PC], etc., do not contain formaldehyde, and can only melt and become viscous when heated to the melting point. The recovered film-like recycled raw materials are preferably washed, dehydrated, dried, heated and melted, and pelletized in order to make plastic pellets that are convenient for use in subsequent processes. The recovered non-film-like recycled raw materials are preferably sequentially processed through steps such as crushing, cleaning, dehydration, drying, heating and melting, and granulation to make plastic granules that are convenient for use in subsequent processes. Furthermore, if a new thermoplastic polymer resin raw material is selected, it is preferably selected from plastic granules.

As shown in FIG. 2 , FIG. 3B and FIG. 3C , the resin sheeting step S2 of the manufacturing method of the composite board according to the first embodiment of the present invention is: heat-treating the thermoplastic polymer resin raw material 10 into a thermoplastic polymer resin sheet 11 . More specifically, the thermoplastic polymer resin material 10 is solid and non-viscous at room temperature, so it is heated and melted by means of high frequency, and then the thermoplastic polymer resin sheet 11 is made by appropriate means such as rolling. The thermoplastic polymer resin sheet 11 can be selected to be cut into appropriate length and width dimensions, or formed into a long strip and wound on a supply wheel 100 .

As shown in Fig. 2, Fig. 3D, Fig. 3E and Fig. 3F, step S3 of the unit panel body of the manufacturing method of the composite panel in the first embodiment of the present invention is: heating and pasting the thermoplastic polymer resin sheet 11 on a wooden sheet 20 At least one surface is used to form a unit plate body 30 . More specifically, the present invention prefabricates the wood veneer 20 firstly, which is prefabricated by the steps of cutting, coiling, drying and cutting (as shown in FIG. 1A ) in sequence. The wooden sheet 20 is cut into appropriate length and width dimensions. If the wood veneer 20 does not conform to the size standard, first use the jigsaw method to bond each two adjacent wood veneers 20 with the molten thermoplastic polymer resin material 10, and then trim the edges to meet the length and width size standards. After the wood veneer 20 is prefabricated, the thermoplastic polymer resin veneer 11 and the veneer veneer 20 are first transported to be stacked and positioned in a molding die 300, and then heated by means of high-frequency waves to perform thermocompression bonding of the thermoplastic polymer resin The thin slice 11 and the wooden thin slice 20 further compose the unit plate body 30 . As shown in Figure 3e, during thermocompression bonding, the thermoplastic polymer resin sheet 11 partially melts and infiltrates into the wood fibers of the wood sheet 20, thereby forming several glue nails 111, which increase the thermoplastic polymer resin sheet 11 And the bonding strength of the wood sheet 20, so that the thermoplastic polymer resin sheet 11 will not be detached from the wood sheet 20.

On the other hand, as shown in FIG. 4 , the thermoplastic polymer resin sheet 11 and the wood sheet 20 can be cut first and then combined into the unit board body 30 , or they can be cut after the unit board body 30 is formed. cut. That is to say, when the thermoplastic polymer resin sheet 11 can be wound on a supply wheel 100 in a long strip, and the wood veneer 20 can also be wound in a long strip on another supply wheel 200, Therefore, the two can be transported to a hot-pressing roller 301 through several rollers and other conveying mechanisms (not marked), firstly carry out hot-pressing bonding such as rolling, and finally cut into the unit plate body 30, and store it properly for future use. for subsequent use or shipping.

As shown in FIG. 2 , FIG. 3G and FIG. 3H , the thermocompression step S4 of the manufacturing method of the composite panel in the first embodiment of the present invention is: thermocompression bonding at least two of the unit panels 30 to form a composite panel 40 . To be more specific, first stack and position an appropriate number of the unit boards 30 , and send them into a molding die 400 for heat-compression bonding by means of high-frequency waves or the like. After the thermal pressing is completed, the forming die 400 is opened, and the composite plate 40 can be taken out. During thermocompression bonding, the thermoplastic polymer resin sheet 11 of each unit panel body 30 is partially melted and infiltrated into the wood fiber of another adjacent wood sheet 20 of the unit panel body 30, thereby forming several glue nails 111 [such as 3e], to increase the bonding strength of each two adjacent unit plates 30. Finally, the composite plate 40 is subjected to initial quality inspection, cutting, finished product inspection, packaging and delivery.

As shown in FIG. 5 and FIG. 6 , the manufacturing method of the composite plate according to the second embodiment of the present invention. Compared with the first embodiment, the second embodiment includes steps: a resin recycling step S1, a resin thinning and unit board step S2+S3, and a thermal pressing step S4, thereby further simplifying the manufacturing process. The resin recycling step S1 can be optionally executed or not executed, which is: recycling (or preparing) at least one thermoplastic polymer resin raw material 10 . The step S2+S3 of resin thinning and unit plate body is: after heating and melting the thermoplastic polymer resin raw material 10, directly use the hot pressing roller 301 to evenly coat at least one surface of a wooden sheet 20, the thermoplastic polymer resin The raw material 10 forms a thermoplastic polymer resin sheet 11. At this time, the thermoplastic polymer resin sheet 11 is combined with the wood sheet 20 to form a unit board body 30 during curing, and forms the glue nail 111 (as shown in FIG. 3e). The thermocompression bonding step S4 is: thermocompression bonding at least two of the unit panels 30 to form a composite panel 40 (as shown in FIG. 3G and FIG. 3H ). During the coating molding of the unit board body 30, the thermoplastic polymer resin sheet 11 will also partially melt and infiltrate into the wood fiber of the wood sheet 20 of the other unit board body 30, and then form several glue nails 111, to increase The bonding strength of two adjacent unit plates 30 (as shown in FIG. 3e ). In addition, other process conditions of the second embodiment follow the process conditions of the first embodiment.

As mentioned above, compared with the common manufacturing method of composite panels in Fig. 1A to Fig. 1G, the formaldehyde resin glue 92 is used to bond the wood veneer 91, but formaldehyde is a harmful substance, it cannot be waterproof, and its viscosity at room temperature is not conducive to stacking In addition, there may be shortcomings such as uneven brushing, etc. The present invention in FIG. 2 recycles various thermoplastic polymer resin raw materials 10, selects and prefabricates the thermoplastic polymer resin sheet 11, and then combines it with the wood sheet 20 to form the unit board. body 30; or, the thermoplastic polymer resin material 10 is selected to be directly cured on the wood sheet 20 to form the thermoplastic polymer resin sheet 11, and then directly combined into the unit board body 30. The thermoplastic polymer resin sheet 11 is insoluble in water, does not contain formaldehyde, and has no viscosity at normal temperature, and the glue nail 111 can be used to increase the structural strength of the unit board body 30, making it suitable for long-distance transportation before post-processing, And the number of stacked layers of the unit plate body 30 can be selected according to the requirement, so as to carry out the subsequent thermal pressing process. Therefore, the present invention can indeed reduce the cost of raw materials, and increase the waterproofness, product safety, transportation convenience, stacking positioning accuracy and manufacturing yield of the composite board 40 .

Claims (23)

1. A method for manufacturing a composite plate, characterized in that it comprises steps: heat-treating at least one thermoplastic polymer resin material into a thermoplastic polymer resin sheet; The thermoplastic polymer resin sheet is heated and attached to at least one surface of a wooden sheet to form a unit board body; and At least two of the unit boards are hot-pressed to form a composite board. 2. The manufacturing method of the composite board according to claim 1, characterized in that at least one thermoplastic polymer resin raw material is recycled for manufacturing the thermoplastic polymer resin sheet. 3. The manufacturing method of the composite plate according to claim 2, characterized in that: the thermoplastic polymer resin raw material is recycled from at least one of film-like recycled raw materials and non-film-like recycled raw materials. 4. The manufacturing method of the composite board according to claim 1, characterized in that: the thermoplastic polymer resin raw material is selected from thermoplastic polymer resins that are solid and non-viscous at room temperature. 5. The manufacturing method of the composite board according to claim 4, characterized in that: the thermoplastic polymer resin raw material is selected from polyethylene, polypropylene, polyethylene terephthalate, polyvinyl chloride, acrylonitrile/butadiene /at least one of styrene copolymer or polycarbonate. 6. The manufacturing method of the composite panel according to claim 1, characterized in that: before the wood veneer and the thermoplastic polymer resin veneer are combined into the unit panel body, if the wood veneer does not meet the size standard, first use the jigsaw method to assemble Each two adjacent wood veneers are bonded by melting the thermoplastic polymer resin material. 7. The manufacturing method of the composite board according to claim 1, characterized in that: one of the high-frequency method and the rolling method is used for heating, so as to perform thermocompression bonding of the thermoplastic polymer resin sheet and the wood sheet. 8. The manufacturing method of the composite board according to claim 1, characterized in that: the thermoplastic polymer resin sheet partially melts and infiltrates into the wood fiber of the wood sheet during hot pressing, and then forms several glue nails to increase the unit The bonding strength of the board. 9. The manufacturing method of the composite panel according to claim 1, characterized in that: the thermoplastic polymer resin sheet and the wood sheet are cut first, and then combined into the unit panel body. 10. The manufacturing method of the composite panel according to claim 1, characterized in that: the thermoplastic polymer resin sheet and the wood sheet are cut after forming the unit panel body. 11. The manufacturing method of the composite plate according to claim 1, characterized in that: high-frequency heating is used to perform thermocompression bonding of at least two of the unit plates. 12. The manufacturing method of the composite panel according to claim 1, characterized in that: the thermoplastic polymer resin sheet of each unit panel is partially melted and infiltrated into the wood fiber of the wood sheet of another adjacent unit panel during hot pressing Inside, several glue nails are formed to increase the bonding strength of the composite panel. 13. A method for manufacturing a composite plate, characterized in that it comprises the steps of: Heat and coat at least one thermoplastic polymer resin material on at least one surface of a wood sheet, the thermoplastic polymer resin material forms a thermoplastic polymer resin sheet, and combines with the wood sheet to form a unit board; and At least two of the unit boards are hot-pressed to form a composite board. 14. The manufacturing method of the composite board according to claim 13, characterized in that at least one thermoplastic polymer resin raw material is recycled to be coated on the wood veneer to form the thermoplastic polymer resin sheet. 15. The manufacturing method of the composite plate according to claim 14, characterized in that: the thermoplastic polymer resin raw material is recovered from at least one of film-like recycled raw materials and non-film-like recycled raw materials. 16. The manufacturing method of the composite plate according to claim 13, wherein the thermoplastic polymer resin raw material is selected from thermoplastic polymer resins that are solid and non-viscous at room temperature. 17. The manufacturing method of the composite board according to claim 16, characterized in that: the thermoplastic polymer resin raw material is selected from polyethylene, polypropylene, polyethylene terephthalate, polyvinyl chloride, acrylonitrile/butadiene /at least one of styrene copolymer or polycarbonate. 18. The manufacturing method of the composite panel according to claim 13, characterized in that: before the wood veneer and the thermoplastic polymer resin veneer are combined into the unit panel body, if the wood veneer does not meet the size standard, first use the jigsaw method to assemble Each two adjacent wood veneers are bonded by melting the thermoplastic polymer resin material. 19. The manufacturing method of the composite board according to claim 13, characterized in that: the thermoplastic polymer resin sheet partially melts and infiltrates into the wood fiber of the wood sheet during coating, and then forms several glue nails to increase the unit The bonding strength of the board. 20. The manufacturing method of the composite board according to claim 13, characterized in that: the wood veneer is cut first, and then combined into the unit board body. 21. The manufacturing method of the composite board according to claim 13, characterized in that: the wood veneer is cut after forming the unit board body. 22. The manufacturing method of the composite board according to claim 13, characterized in that: high-frequency heating is used to bond at least two unit boards by thermocompression. 23. The manufacturing method of the composite panel according to claim 13, characterized in that: the thermoplastic polymer resin sheet of each unit panel partly melts and infiltrates into the wood fiber of the wood sheet of another adjacent unit panel during hot pressing Inside, several glue nails are formed to increase the bonding strength of the composite panel.

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