CN109079933B - Improved production process of mould pressing wood piece coating melamine impregnated wear-resistant paper - Google Patents
Improved production process of mould pressing wood piece coating melamine impregnated wear-resistant paper Download PDFInfo
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- CN109079933B CN109079933B CN201810816970.7A CN201810816970A CN109079933B CN 109079933 B CN109079933 B CN 109079933B CN 201810816970 A CN201810816970 A CN 201810816970A CN 109079933 B CN109079933 B CN 109079933B
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- resistant paper
- wear
- die
- melamine impregnated
- heat
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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
Abstract
The invention relates to an improved production process of melamine impregnated wear-resistant paper for a mould pressing wooden part coating, which is invented for optimizing product performance. The method comprises the steps of coating the surface of a layer to be coated of a molded wood piece blank by melamine impregnated wear-resistant paper in a mold, closing the mold, pressurizing and heating to make the melamine impregnated wear-resistant paper attached to the surface of the molded wood piece blank and curing; the method is characterized in that: the method comprises the steps of adopting low-heat gradually-softened and high-heat-cured melamine impregnated wear-resistant paper, placing a mould pressing wood piece blank into a lower mould cavity in a mould pressing machine which is arranged by vertically opening and closing a mould, covering the mould pressing wood piece blank with the low-heat gradually-softened and high-heat-cured melamine impregnated wear-resistant paper, firstly baking and heating the low-heat gradually-softened and high-heat-cured melamine impregnated wear-resistant paper until the melamine impregnated wear-resistant paper is softened, then closing the mould and heating under pressure, and enabling the low-heat gradually-softened and high-heat-cured melamine impregnated wear-resistant paper to be attached to the upper surface of the mould pressing wood piece blank and be cured.
Description
Technical Field
The invention belongs to the technical field of production of mould pressing wood parts. In particular to a production process of melamine impregnated wear-resistant paper for coating a mould pressing wooden piece blank.
Background
The moulded wooden parts are wooden workpieces which are solidified and formed in a mould under the action of pressure and heat by taking wood powder (mainly lignin and/or cellulose components) with proper granularity as a filling material and a thermosetting material as a binder. The die-pressed wood piece is widely applied to the fields of furniture, buildings, machinery and the like, and can often obtain the effect of imitating raw wood.
The existing production process of the molded wooden piece generally comprises the steps of mixing wood powder and a binder at room temperature to obtain a molded material, filling the molded material into a mold, and pressurizing and heating to obtain a molded wooden piece blank.
In order to optimize the mechanical and physical properties and appearance such as smooth color of the molded wooden parts, the molded wooden parts are usually coated or sprayed.
Cladding of molded wood piece blanks is also accomplished on a molding press using a thermoset of material. The more common coating materials are wood flakes or printed wood grain paper, but these coating materials usually require an additional spraying operation, such as spraying paint. The melamine impregnated wear-resistant paper is also used as a coating material of the mould pressing wooden piece, and the mould pressing wooden piece coated by the melamine impregnated wear-resistant paper has the advantages of smoothness, wear resistance, heat resistance, flame retardance, no need of spraying and the like. However, because the commercially available melamine impregnated wear-resistant paper is a thin sheet which is brittle and easy to break, and is limited by the production process of the coating, the melamine impregnated wear-resistant paper is only used for a plane coating, such as a floor and a furniture table.
Disclosure of Invention
The invention aims to provide an improved production process of a melamine-dipped wear-resistant paper for a covering layer of a molded wooden piece, so that the melamine-dipped wear-resistant paper is coated on a curved surface of a molded wooden piece blank.
The technical scheme of the invention is as follows: through experimental observation, the following results are obtained: in the process that the temperature of melamine impregnated wear-resistant paper of a part of varieties is increased from room temperature to the thermosetting process temperature (150-200 ℃), a temperature interval in which the melamine impregnated wear-resistant paper gradually tends to be softened along with the increase of the temperature is arranged below the thermosetting temperature. A name is given to melamine impregnated wear resistant paper having this property: the melamine dipped wear-resistant paper is gradually softened at low heat and solidified at high heat.
Possible reasons why melamine impregnated wear resistant papers that soften on low heat and cure on high heat exhibit this property are: the paper used for impregnation (possibly also a nonwoven) contains thermoplastic fibres.
The melamine dipped wear-resistant paper which is gradually softened at low heat and solidified at high heat is adopted, in a mould press which is arranged in a way that a mould is opened and closed at the upper part and the lower part of the mould (the same as the prior art), the method comprises the steps of placing a molded wood piece blank into a lower mold cavity, covering the molded wood piece blank with low-heat gradually-softened and high-heat-cured melamine impregnated wear-resistant paper, (preferably, a layer of wood slice or a pattern layer of wood grain paper can be added between the molded wood piece blank and the low-heat gradually-softened and high-heat-cured melamine impregnated wear-resistant paper, so that the mechanical and physical properties of the molded wood piece can be optimized, and the appearance of the molded wood piece product can be beautified), firstly baking and heating the low-heat gradually-softened and high-heat-cured melamine impregnated wear-resistant paper until the melamine impregnated wear-resistant paper is softened, then closing the mold and heating under pressure, so that the low-heat gradually-softened and high-heat-cured melamine impregnated wear-resistant paper is attached to the upper surface of the molded wood piece blank, and curing.
Namely: an improved production process of melamine impregnated wear-resistant paper for a mould pressing wood piece coating comprises the steps of coating the surface of a layer to be coated of a mould pressing wood piece blank by using the melamine impregnated wear-resistant paper in a mould, closing the mould, pressurizing and heating to ensure that the melamine impregnated wear-resistant paper is attached to the surface of the mould pressing wood piece blank and curing; the method is characterized in that: the method comprises the steps of adopting low-heat gradually-softened and high-heat-cured melamine impregnated wear-resistant paper, placing a mould pressing wood piece blank into a lower mould cavity in a mould pressing machine which is arranged by vertically opening and closing a mould, covering the mould pressing wood piece blank with the low-heat gradually-softened and high-heat-cured melamine impregnated wear-resistant paper, firstly baking and heating the low-heat gradually-softened and high-heat-cured melamine impregnated wear-resistant paper until the melamine impregnated wear-resistant paper is softened, then closing the mould and heating under pressure, and enabling the low-heat gradually-softened and high-heat-cured melamine impregnated wear-resistant paper to be attached to the upper surface of the mould pressing wood piece blank and be cured.
The invention has the beneficial effects that: obviously, the process of the invention can coat the melamine impregnated wear-resistant paper on the curved surface of the molded wooden piece blank. On one hand, the product field of the process and the application of the excellent coating material is popularized, and on the other hand, the product quality of a plurality of curved surface products is optimized. Thinking will know that: although some words are said, the method has huge economic and environmental benefits.
Drawings
Fig. 1 is a graph of temperature-hardness change for a melamine impregnated wear resistant paper that is soft on low heat and cured on high heat.
Fig. 2 to 11 are schematic views of the process of producing the chair seat plate on the molding press, wherein the process of the invention, namely the improved production process of the melamine impregnated wear-resistant paper for the molded wood part coating, is included. Wherein:
FIG. 2 is a bottom view of the upper die; in combination with the front view of the upper mold portion of any of figures 3-10 (and figure 11), the shape of the molded wooden piece (i.e., the chair seat plate) can be defined.
Fig. 3 is a schematic view of the initial mold-open state.
Fig. 4 is a schematic view of a lower mold for laying a single-sided adhesive coated wood sheet or paper (hereinafter collectively referred to as a single-sided adhesive coated pattern layer, the adhesive coated side of which is a side adjacent to a molded wood piece body).
Fig. 5 is a schematic view of the filling of the molding material.
FIG. 6 is a schematic view of hot press forming of a clamped blank.
Fig. 7 is a schematic view of a single-face cloth glue pattern layer and melamine-dipped wear-resistant paper sequentially placed on a blank in an open mold state.
FIG. 8 is a schematic view of pre-heating melamine dipped wear resistant paper using the heat radiation baking of the upper die; the upper die is close to but not in contact with the melamine dipped wear-resistant paper.
Fig. 9 is a schematic diagram of a mold closing control covering single-sided cloth glue pattern layer and melamine dipped wear-resistant paper.
Fig. 10 is a schematic view of surface coating after mold opening.
FIG. 11 is a schematic view of a product hierarchy; in order to clearly show the layered structure, the bottom single-sided glue-coated pattern layer 3, the upper single-sided glue-coated pattern layer 5 and the melamine-impregnated wear-resistant paper 6 are thickened and shown in the figure.
The symbols in the figure illustrate: 1 upper die, 10 upper die cavity, 16 gaps, 2 lower die, 3 bottom single-face cloth glue pattern layer, 4 die pressing material, 5 upper single-face cloth glue pattern layer, 6 melamine impregnated wear-resistant paper, 91 blank and 99 product.
Detailed Description
The following detailed description of the invention refers to the accompanying drawings and examples. These examples are only for illustrating the present invention and should not be construed as limiting the scope of the present invention.
An improved production process of melamine impregnated wear-resistant paper for a mould pressing wood piece coating comprises the steps of coating the surface of a layer to be coated of a mould pressing wood piece blank by using the melamine impregnated wear-resistant paper in a mould, closing the mould, pressurizing and heating to ensure that the melamine impregnated wear-resistant paper is attached to the surface of the mould pressing wood piece blank and curing; the method is characterized in that: the method comprises the steps of adopting low-heat gradually-softened and high-heat-cured melamine impregnated wear-resistant paper, placing a mould pressing wood piece blank into a lower mould cavity in a mould pressing machine which is arranged by vertically opening and closing a mould, covering the mould pressing wood piece blank with the low-heat gradually-softened and high-heat-cured melamine impregnated wear-resistant paper, firstly baking and heating the low-heat gradually-softened and high-heat-cured melamine impregnated wear-resistant paper until the melamine impregnated wear-resistant paper is softened, then closing the mould and heating under pressure, and enabling the low-heat gradually-softened and high-heat-cured melamine impregnated wear-resistant paper to be attached to the upper surface of the mould pressing wood piece blank and be cured.
Further, in the improved process for producing the melamine impregnated wear-resistant paper for the covering layer of the molded wooden piece, as described above, a pattern layer (such as a wood sheet or wood grain paper) is added between the molded wooden piece blank and the low-heat softened and high-heat cured melamine impregnated wear-resistant paper. Therefore, the mechanical and physical properties of the molded wooden piece can be optimized, and the appearance of the molded wooden piece product can be beautified.
The melamine impregnated wear-resistant paper which is gradually softened at low heat and cured at high heat can be baked and heated by adopting a baking and heating device (such as an infrared lamp tube) additionally arranged on a molding press; or stopping in the middle of closing the die, and transmitting the heat of the upper die to the melamine dipped wear-resistant paper which is softened gradually by low heat and solidified by high heat through radiation so as to soften the melamine dipped wear-resistant paper.
Specifically, please refer to fig. 2 to fig. 11. The technological process of producing chair seat board in mold press includes the following steps:
in the initial mold opening state shown in fig. 3, a bottom single-side glue-spreading pattern layer 3 is arranged on the lower mold 2 as shown in fig. 4; then filling the lower die 2 with a molding material 4 as shown in FIG. 5; then, the mold is closed as shown in fig. 6, and the bottom single-sided adhesive pattern layer 3 and the molding material 4 compacted according to the mold cavity are bonded to each other by applying pressure and heat and are thermoset, so that a molded wood blank 91 is formed; then, opening the die, and sequentially placing the upper single-face cloth glue pattern layer 5 and the melamine dipped wear-resistant paper 6 on the blank 91 positioned in the die cavity of the lower die 1 in a die opening state as shown in figure 7; then closing the die to a quasi die closing and baking state, wherein the upper die 1 is close to and does not contact the melamine dipped wear-resistant paper 6, and the melamine dipped wear-resistant paper 6 is baked and preheated (softened) by utilizing the heat radiation of the upper die, and the test can be firstly carried out, namely, the upper single-side glue-coated pattern layer 5 is not put in, the suspended part of the melamine dipped wear-resistant paper 6 is observed to collapse and soften visually, and the baking time is recorded for reference of subsequent production) as shown in figure 8; then, the die is closed as shown in fig. 9, the upper single-sided cloth glue pattern layer 5 and the blank 91 are bonded with each other by pressurizing and heating, and meanwhile, the melamine-dipped wear-resistant paper 6 and the upper single-sided cloth glue pattern layer 5 are bonded with each other and are thermoset to form a die-pressed wooden piece 99; then opening the mold as shown in figure 10; the molded wooden piece product as shown in fig. 11 is taken out again; the mold returns to the state of fig. 3 ready for the production of the next product; and the process is circulated.
With respect to the process temperature and time parameters of the other links except the process shown in fig. 8, the prior art parameters can be used.
Claims (1)
1. An improved production process of mould pressing wood piece coating melamine impregnated wear-resistant paper is characterized by comprising the following steps:
in the initial die opening state, a bottom single-side glue spreading pattern is distributed on a lower die; filling a molding material into the lower die; then closing the die, pressurizing and heating to enable the single-face glue distribution pattern layer at the bottom and the mould pressing material compacted according to the die cavity to be mutually bonded and thermally cured to form a mould pressing wood piece curved blank;
then opening the die, and sequentially placing an upper single-face cloth glue pattern layer and melamine dipped wear-resistant paper on the blank positioned in the lower die cavity in the die opening state; then closing the die to a quasi die closing and baking state, wherein the upper die is close to and does not contact the melamine dipped wear-resistant paper, and the melamine dipped wear-resistant paper is baked and preheated by utilizing the heat radiation of the upper die; then closing the die, pressurizing and heating to enable the upper single-side cloth glue pattern layer and the blank to be mutually bonded, and simultaneously enabling the melamine impregnated wear-resistant paper and the upper single-side cloth glue pattern layer to be mutually bonded and thermally cured to form a die-pressed wooden piece; then opening the mold and taking out the molded wooden product;
The mould pressing wooden piece is a wooden workpiece which is formed by solidifying wood powder serving as a filling material and a thermosetting material serving as a binder in a mould under the action of pressure and heat.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810816970.7A CN109079933B (en) | 2018-07-24 | 2018-07-24 | Improved production process of mould pressing wood piece coating melamine impregnated wear-resistant paper |
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| CN201810816970.7A CN109079933B (en) | 2018-07-24 | 2018-07-24 | Improved production process of mould pressing wood piece coating melamine impregnated wear-resistant paper |
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| CN109079933A CN109079933A (en) | 2018-12-25 |
| CN109079933B true CN109079933B (en) | 2022-07-15 |
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| CN112757699B (en) * | 2019-11-06 | 2022-07-08 | 胡琴 | Method for hot-pressing veneering of melamine decorative paper and application thereof |
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| EP1721928A1 (en) * | 2005-05-13 | 2006-11-15 | Coveright Surfaces Holding GmbH | Resin composition comprising waste of resin impregnated material |
| CN101307639A (en) * | 2008-06-05 | 2008-11-19 | 陆旻 | Ironing picture wooden floor and its manufacturing technique |
| CN103358363A (en) * | 2012-03-28 | 2013-10-23 | 桦甸市惠邦木业有限责任公司 | Melamine veneer molded embossed wood grain board and production technology thereof |
| CN104191791B (en) * | 2014-08-14 | 2015-09-30 | 常州佳饰家装饰新材料有限公司 | The technique of a kind of pure solid wood or log special-shaped wood strip making heat pressing dipping glued membrane facing paper |
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|---|---|---|---|---|
| KR100258600B1 (en) * | 1997-10-06 | 2000-06-15 | 성재갑 | Melamine sheet laminated floorboard |
| CN101367220A (en) * | 2008-09-19 | 2009-02-18 | 北京市森诺家具材料有限公司 | Composite section material for coating wood surface on surface of plastic/wood-plastic sectional material and manufacturing method therefor |
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| CN103072255A (en) * | 2013-01-21 | 2013-05-01 | 丁庆太 | Process for coating exposed surface of door and window set decorative line by using melamine impregnated paper |
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