JP2005144744A - Skinned woody molded product and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method of a skinned woody molded product constituted so as to fix a skin material comprising polyvinyl chloride to a base material containing woody fibers with high strength using a thermoplastic resin as a binder. <P>SOLUTION: An adhesive material having adhesiveness with respect to both of polyvinyl chloride and woody fibers is arranged between the base material, which comprises woody fibers and a binder resin containing polyolefin and/or polyester for bonding the woody fibers, and a skin material formed of a sheet wherein at least the part fixed to the base material comprises polyvinyl chloride not only to apply a high frequency causing the molecular friction of polyvinyl chloride to the region where the base material and the skin material are fixed but also to press that region to fix the skin material to the base material. The binder resin of the base material is melted by heat generated in PVC by a high frequency to expose the woody fibers to interpose the adhesive material between the woody fibers and PVC. The perfectly exposed woody fibers are surrounded by PVC to bond the partially exposed woody fibers and PVC by the adhesive material. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a wood molded body including a base material made of a wood material bonded by a thermoplastic binder resin and an outer skin, and a method for manufacturing the same, and more particularly to a wood molded body including a polyvinyl chloride skin and a method for manufacturing the same. About.

  2. Description of the Related Art As an interior material in a room such as a vehicle or a building or a furniture cover material, a material provided with a polyvinyl chloride (PVC) skin material is known. It is known that PVC skin materials can be bonded by high frequency welding. In high-frequency welding, an electromagnetic wave having a predetermined frequency is applied to the welded portion to cause molecular friction in the PVC to generate heat, and this heat melts and welds the PVC and other resin as appropriate.

  However, in the high frequency welding of PVC, sufficient adhesion may not be obtained by bonding to a material having low compatibility with PVC or a resin material that does not melt by heating with high frequency of PVC. That is, it may not adhere at all, or even if it adheres, peeling or floating may be seen partially. For this reason, for example, a polyurethane-based or polyester-based adhesive material having both adhesiveness to PVC and adhesiveness to a member to be bonded is applied to the adhesive surface of PVC, and a cloth-like material made of polyamide or polyester resin is used as a high-frequency wave. A method of bonding in welding is known (for example, see Patent Document 1).

Japanese Utility Model Publication No. 63-33926

  In recent years, it has been considered that a board in which fibers of a wood material are bonded with a binder resin is used as a base material of an interior material. Various binder resins for such a wooden molded body can be selected. However, by using a thermoplastic resin such as polyolefin or polyester, the load on the natural environment at the time of disposal can be reduced, or the resin can be reused. However, since these binder resins have extremely low compatibility with PVC, even if an attempt is made to weld the PVC skin to a wooden molded body by high frequency welding, the binder resin hardly adheres.

In view of this, the present invention provides a method for producing a wooden molded body having a skin that uses a thermoplastic resin as a binder and fixes a skin material made of polyvinyl chloride to a base material containing wood fibers with higher strength. Let it be an issue.
Another object of the present invention is to provide a wood molded body comprising a thermoplastic resin as a binder, a base material containing wood fibers, and a skin material made of polyvinyl chloride.

The inventors of the present invention have found that when a high frequency is applied to PVC by bringing it into contact with a base material containing wood fibers having a binder of polypropylene having almost no adhesiveness with PVC, the inventors have made extensive studies on this point. As a result, it was found that in the welded portion, the PVC completely surrounds the wood fiber that is completely exposed by melting of the PP due to the heat generated in the PVC by high frequency, and so-called anchors are formed. At the same time, the wood fiber partially exposed by the melting of PP is present in a considerable proportion, but it is found that it does not contribute to the fixation only by contacting with PVC, and the following invention has been completed. .
That is, according to the first aspect of the present invention, a base material comprising a wood fiber and a binder resin containing polyolefin and / or polyester for binding the wood fiber, and at least a portion fixed to the base material is made of polyvinyl chloride. An adhesive material having adhesiveness is disposed on both the polyvinyl chloride and the wood fiber between the skin material formed of the sheet, and the polyvinyl chloride is bonded to the portion where the base material and the skin material are fixed. A method for producing a woody molded article having an epidermis, characterized by applying a high frequency at which molecular friction occurs and applying pressure to fix the epidermis to a substrate.
According to the first invention, the PVC is heated by high frequency, and the binder resin of the base material is melted by this heat to expose the wood fiber, thereby interposing the adhesive material between the wood fiber and the PVC. Then, the wood fiber completely exposed to the molten PVC is surrounded to form an anchor, and the partially exposed wood fiber and the PVC are bonded together with an adhesive material. Thereby, a woody molded object provided with a skin can be manufactured by firmly fixing the skin material to the base material.

A second invention of the present invention is a method for producing a wood molded article according to the first invention, wherein the adhesive material is a nitrile rubber.
According to the second invention, by using a nitrile rubber-based adhesive material having high adhesive strength with PVC and good adhesion with wooden fibers, it is possible to produce a wooden molded body with higher fixing strength.

Moreover, 3rd invention of this invention is firmly fixed to the surface of the base material at least partially with the base material which has a wood fiber and the binder resin containing polyolefin and / or polyester which couple | bond the said wood fibers. A wood molded article comprising a skin material comprising a polyvinyl chloride layer, wherein the polyvinyl chloride layer completely surrounds the wood fiber exposed from the binder resin, and the wood fiber surface is interposed through an adhesive material It is a woody molded article provided with an outer skin characterized by comprising an adhesive part bonded to a polyvinyl chloride layer.
According to the third invention, the skin material is a wooden molded body that is stably fixed to the base material by the anchor part and the adhesive part, and is used as an interior material in various parts that require a predetermined fixing strength. Can be applied.

  In the present invention, by providing a method for producing a wooden molded body having a skin that fixes a skin material made of polyvinyl chloride with higher strength to a base material containing a wood fiber using a thermoplastic resin as a binder, By providing a wood molded article comprising a thermoplastic resin as a binder, a base material containing wood fibers and a skin material made of polyvinyl chloride, a good design is imparted by the polyvinyl chloride, and the skin material A wood molded body that can be used for various purposes such as a vehicle interior material can be obtained by achieving an adhesion strength of a predetermined level or more.

The best mode for carrying out the present invention will be described in detail below.
FIG. 1 is a door trim constituting a vehicle interior which is a wood molded body 1 according to an embodiment of the present invention. The woody molded body 1 is a laminate in which a base material 5 and a skin material 11 are integrated.
The substrate 5 is a rigid member that is molded into a plate shape having a three-dimensional shape. As shown in FIG. 3, the base material 5 is composed of a wood fiber 6 and a binder resin 7 to which the wood fiber 6 is bonded.

  The wood fiber 6 is a fiber that can be collected from a wood material, and may be any of woody and herbaceous materials, and is collected from a desired collection site such as trunk, branch, leaf, stem, root, fruit, and shell. Fiber can be used. For example, coniferous trees such as cedar and cypress, broad-leaved trees such as shii, oak and cherry, and tropical trees can be used. These may be, for example, thinned wood, wood scrap, waste wood, or pulp. It may be subjected to chemical treatment. The wood fiber 6 derived from wood may be obtained by, for example, dry opening using a disc refiner or the like, but since there are fewer components other than fibers, fibers obtained by wet opening such as explosion are used. preferable.

  The herbs are not limited, but bast plants from which good quality fibers can be easily obtained are preferable, and examples thereof include sisal, jute, and kenaf. In addition, rice straw etc. may have been subjected to treatment such as stems and leaves after harvesting fruits, sugarcane bagasse and the like. Kenaf is preferable because long fibers can be obtained more easily. Fibers derived from herbs are easy to mold and have good adhesion to the adhesive material described later, for example, fibers from which hemicellulose bonding between fibers has been removed by microbial treatment or chemical treatment. It is preferable.

  In the base material 5, the wood fibers 6 are uniformly dispersed in an arbitrarily entangled state. The wood fiber 6 may be in a state where it is blown away by air laying or the like, for example, or may be in a state obtained by a process in which fibers are entangled such as water jet or needle punching.

  The binder resin is a thermoplastic resin made of polyolefin and / or polyester. The binder resin is a resin that can bind the wood fibers satisfactorily and softens or melts at a temperature at which the wood fibers are not destroyed, and is preferably such that it can be easily heated and pressed. As the polyolefin, for example, polyethylene and polypropylene can be used, and polypropylene is preferable from the viewpoint of moldability and melting temperature. The polyester is not particularly limited, and examples thereof include polyethylene terephthalate, polylactic acid, or a copolymer of polylactic acid and (meth) acrylic acid, dicarboxylic acid and polyol constituting other polyester, caprolactone, and the like. be able to.

  In addition to the wood fiber 6 and the base material 5, the base material 5 may include known auxiliary materials such as a flame retardant, a filler, and other fibers. In addition to wood fibers, wood particles, wood powder, and the like may be included. The wood particles and wood powder contained in the base material 5 are expected to contribute to the fixation of the skin material 11, like the wood fibers 6.

  The skin material 11 is a sheet-like member having a surface constituting a design, and at least a portion fixed to the base material is formed of a sheet made of polyvinyl chloride. The skin material 11 may be a single layer of polyvinyl chloride (PVC), but may also be a multilayer having a plurality of layers. In this embodiment, it forms in the multilayer body which has three sheets of the adhering sheet | seat 13, the foam sheet 15, and the design sheet 17 in an order from the base material 5 side.

  The fixing sheet 13 is a sheet that contributes to fixing to the surface of the substrate 5 and is made of PVC. The fixing sheet 13 may have the same size as the entire surface covered with the skin material 11 of the base material 5 or a size corresponding to the fixing portion 25 and its vicinity described later, and is disposed only in the fixing portion 25 and its vicinity. May be. When the fixing sheet 13 has a size corresponding to the fixing portion 25 and the vicinity thereof, the wood molded body 1 is preferably reduced in weight and cost by the amount of the fixing sheet 13 being small.

  The foam sheet 15 is a sheet that imparts cushioning properties to the design surface of the woody molded body 1 and is made of a resin foam. The material of the foam sheet 15 is not particularly limited, but it is preferable that the foam sheet 15 is formed of a material that has open bubbles and is not softened by heating received during exposure to a high frequency described later. Examples of such foam sheet 15 include polyurethane, and slab urethane is preferable. The foam sheet 15 may be in a molten state under the conditions of high-frequency welding of PVC, and may be a sheet compatible with PVC, for example, a foam sheet containing polyvinyl chloride.

The design sheet 17 is typically a sheet made of PVC and having a design on the surface. The design sheet 17 is provided with a three-dimensional design such as an embossed pattern on the surface, or a color is given by a coloring agent or the like. The design sheet 17 may be formed of a sheet other than PVC at a portion other than the fixing portion 25. Moreover, the sheet | seat formed of the material which can be fixed by the heat_generation | fever and melting | fusing of PVC by the high frequency described in the manufacturing method mentioned later may be sufficient.
Of course, each of the sheets of the skin material 11 may contain a known auxiliary material, for example, a light stabilizer or a plasticizer.

  The skin material 11 is fixed to the base material 5 by being fixed to the base material 5 at the fixing part 25. The fixing part 25 may be provided anywhere in the woody molded body 1. It is preferable that the fixing portion 25 is provided continuously or intermittently at least along the edge of the skin material 11 because the skin material 11 is hardly peeled off. Therefore, in the wooden molded body 1 shown in FIG. 1, for example, it is preferable that the entire outer peripheral portion is formed in the fixing portion 25. Further, in the form in which the skin material 11 is provided over a larger area, it is preferable that the fixing material 25 is provided at a predetermined interval in the central portion because the skin material 11 is less likely to be displaced with respect to the base material 5. In the present embodiment, as shown in FIG. 1, the fixing portion 25 has a boundary between four straight portions that are parallel to each other and extend substantially horizontally, and a portion that is provided at the center of the wooden molded body 1 and is provided with another member. It is provided in the outer peripheral part which comprises.

  The shape of the fixing part 25 is not particularly limited. Typically, the shape extends in a predetermined direction such as a line shape or a belt shape, and may be completely continuous, or may be intermittently continued like a trace of travel of the gear. In addition, if possible, it is a matter of course that the fixing site may be a two-dimensionally spreading shape such as a circle or a rectangle.

  A cross-sectional view of the fixing portion 25 is shown in FIG. 2, and an enlarged view of this cross-section is shown in FIG. 2, the foamed sheet 15 of the skin material 11 is in a compressed state, and the PVC of the design sheet 17 and / or the fixed sheet 13 is impregnated in the foamed sheet 15 as shown in FIG. It is united. Further, the fixing sheet 13 and the base material 5 are fixed in a state where the surface of the base material 5 is recessed in a concave shape. As shown in FIG. 3, in the concave portion of the base material 5, the thickness of the binder resin 7 is reduced, and the wood fibers 6 are exposed and enter the PVC of the skin material 11. The wood fiber 6 in this portion and the PVC of the skin material 11 are fixed.

As shown in FIG. 3, an adhesive material 21 is applied between the fixing sheet 13 and the base material 5. The adhesive material 21 is a known adhesive material having adhesiveness to both PVC and wood fiber. For example, a polyurethane-based adhesive material or a nitrile rubber-based adhesive material can be used. The nitrile rubber adhesive material is acetonitrile butadiene rubber or the like, and is a so-called NBR adhesive material. An NBR-based adhesive material is preferable because the adhesive strength to PVC is higher. For example, “Hybon 2320S” manufactured by Hitachi Chemical Polymer Co., Ltd. can be used. The adhesive material is interposed between the skin material 11 and the base material 5 at least at the fixing portion 25. An adhesive material may be provided on the entire surface where the skin material 11 and the base material 5 are in contact with each other. However, in the embodiment including the foam sheet 15 as in this embodiment, the adhesive material and the foam sheet 15 are not in contact with each other. When the adhesive material is provided, the cushioning property and flexibility of the foamed sheet 15 can be satisfactorily maintained. That is, in the form in which the fixing sheet 13 has the entire size of the skin material 11, the adhesive material may be applied between the base material 5 and the fixing sheet 13, while the fixing sheet 13 is placed in the fixing portion 25 and the vicinity thereof. In a form in which only the adhesive sheet 13 is provided, it is preferable that the adhesive material is applied within the range of the fixing sheet 13.
The amount of the adhesive material added to the fixing portion 25 is not particularly limited, but is preferably small within a range in which the effect of the adhesive material can be obtained, for example, 20 g / m ² or more and 30 g / m ² or less is preferable.

  The wood fiber 6 and the skin material 11 (fixed sheet 13) are bonded to each other in two types of forms, that is, an anchor portion 27 and an adhesive portion 28. Note that the binder resin of the base material 5 and the skin material 11 or the binder resin 7 and the adhesive material are in contact with each other and are hardly fixed. Even if fixed, the fixing strength is negligibly small.

  The anchor portion 27 is a portion that exceeds half of the cross section of the wood fiber 6, preferably a portion where the entire cross section is exposed, and such wood fiber 6 is a portion surrounded by the PVC of the skin material 11. . That is, PVC is formed in a shape that is entangled with the wood fiber 6 and cannot be removed unless it is deformed, and has a mechanical fixing strength. The anchor portion 27 is a portion that substantially surrounds the wood fiber 6 whose surface is covered with the adhesive material 21 with PVC.

  The bonding portion 28 is a portion where half or less of the cross section of the wood fiber 6 is exposed and is in contact with the PVC through an adhesive material. The wood fiber 6 and the adhesive material 21, and the adhesive material 21 and the PVC are bonded with a predetermined strength or more, and the wood fiber 6 and the skin material 11 are fixed. Although the fixing strength of the bonding portion 28 is smaller than the fixing strength of the anchor portion 27, the ratio of the portion where half or less of the cross section of the wood fiber 6 is exposed is a portion exceeding half of the cross section of the wood fiber 6. Therefore, the ratio of the adhesive portion 28 in the fixing part is large, and the contribution of the skin material 11 to the base material 5 is large.

  In this wooden molded body 1, the skin material 11 is fixed to the base material 5 by both the anchor portion 27 and the adhesive portion 28 at the fixing portion 25, and is a wooden molded body having a stronger and more stable skin. . In particular, the wood fiber 6 exposed from the base material 5 and the PVC of the skin material 11 are bonded to each other by the adhesive material 21, thereby increasing the ratio of the actual fixing portion in the fixing portion 25. It is easy to obtain a fixing strength exceeding a predetermined level. That is, since the ratio of the actual fixing portion in the fixing portion 25, that is, the area ratio is large, the unevenness of the fixing state in the entire fixing portion 25 is reduced, and each portion of the fixing portion 25 has a fixing strength more than a predetermined value more uniformly. I have. Therefore, the woody molded body is reduced in occurrence of floating and peeling.

Next, taking this wooden molded body 1 as an example, a method for manufacturing a wooden molded body according to the present invention will be described.
First, the base material 5 and the skin material 11 are prepared.
In the production of the base material 5, for example, a polypropylene (PP) fiber produced by a melt blow method or the like is mixed with a wood fiber opened to a certain extent and opened to create a web as a fiber deposit. Next, this web is entangled with a needle punch or the like to form a mat that retains the shape, and then press-molded in a state heated to the softening or melting temperature of the binder resin, thereby providing a plate-like substrate having a predetermined three-dimensional shape The material 5 can be formed.
The binder resin should be prepared in a solution or dispersion (colloid, dispersion, emulsion, etc.) and given a predetermined amount by a method such as coating, spraying or impregnation on wood fiber, web or mat. You can also.

The ratio of wood fiber and binder resin is not particularly limited, and the weight ratio of wood fiber: binder resin is 10:90 to 90:10. When the ratio of the wood fiber is smaller than 10%, the ratio of the portion that can be bonded becomes small, and it is difficult to obtain a fixing strength exceeding a predetermined level. On the other hand, when the ratio of the wood fiber exceeds 90%, the strength of the base material 5 itself may be too low. Considering the ratio of the wood fibers in the fixing part, if the ratio of the wood fibers is 70 to 30 wt% or the density of the wood fibers is 0.1 to 0.6 g / cm ³ , good fixing strength can be obtained. ,preferable. It is preferable that the wood fiber: binder resin is in the range of 30:70 to 70:30 because the amount of the binder resin can be reduced, the weight can be reduced, and the amount of petroleum resources used can be reduced.
The base material 5 may be formed of two or more layers having different density of the wood fibers, or may give a density gradient to the wood fibers in the thickness direction. Therefore, for example, the density of the wood fibers on the surface on the side in contact with the skin material is increased, and the other portions are formed at a density lower than that of the surface, thereby increasing the fixing area and improving the physical properties of the substrate 5. It is also possible to maintain.

In creating the skin material 11, first, each sheet is created. The fixing sheet 13 and the design sheet 17 can be respectively produced by a known vinyl leather manufacturing method, and can be formed into a flexible sheet having a predetermined thickness by calendar molding. In the design sheet 17, a desired colorant is added, or an embossed pattern is added to the surface by a known embossing roller or the like. When the design sheet 17 is colored, the fixing sheet 13 is preferably the same color in order to avoid discoloration due to mixing with the fixing sheet 13 at the fixing site.
The foamed sheet 15 can be made of various known flexible foams, and slab urethane is preferable because it can provide suitable cushioning properties and can be formed into a continuous foam shape.

Here, the thickness of the fixing sheet 13 is preferably 0.05 mm or more and 1.0 mm or less from the viewpoint of welding after being exposed to a high frequency. When the thickness is less than 0.05 mm, there is a possibility that the wood fiber exposed in the fixing step described later is not sufficiently in contact. On the other hand, if the fixing sheet 13 has a thickness exceeding 1.0 mm, heat generated by applying a high frequency is transmitted beyond the foamed sheet 15, which may impair the design of the design sheet 17.
The design sheet 17 is preferably 0.05 mm or more. If the thickness is less than 0.05 mm, there is a risk of breakage in fixation using high frequency.

  Next, an adhesive material is applied between the skin material 11 and the base material 5. In the case of using a nitrile rubber-based adhesive material as the adhesive material, it is preferable to use it by dissolving it in an organic solvent because the amount added can be easily controlled and a desired amount can be imparted more uniformly. Although it may be applied by a roller, a brush or the like, spray application is preferable because it can be applied uniformly at a lower density. The adhesive material is typically applied and applied to the surface of the substrate 5, but may be applied and applied to the back surface of the skin material 11, for example, the back surface of the fixing sheet 13. In the form in which the fixing sheet 13 is provided only at a predetermined portion of the skin material 11, it is preferable that an adhesive material is applied to the fixing sheet 13, whereby a change in texture due to penetration of the adhesive material into the foamed sheet 15 can be favorably avoided.

The application amount of the adhesive material is preferably 20 g / m ² or more and 60 g / m ² or less in a dry weight where the solvent is evaporated. If it is less than 20 g / m ² , the adhesive material does not spread well over the entire surface of the wood fiber, and the adhesion tends to be insufficient. On the other hand, when the adhesive material exceeds 60 g / m ² , the influence of inhibiting the contact between the wood fiber and the PVC of the skin material 11 becomes too large, and the fixing strength is lowered. More preferably, the adhesive material has a dry weight of 20 g / m ² or more and 30 g / m ² or less.

  Next, in a state where the base material 5 and the skin material 11 are overlapped, they are exposed to high frequency. The exposure to the high frequency may be the same method as the high frequency welding of polyvinyl chloride (also referred to as high frequency welding or high frequency welding). That is, high-frequency power is obtained by placing electrodes (molds) on the back surface side of the substrate 5 and the surface of the skin material 11, in this embodiment, the surface of the design sheet 17 and sandwiching it with a predetermined pressure. Is supplied between the electrodes. The high frequency exposure and pressurization are performed under the condition that PVC is melted and the binder resin on the surface of the base material 5 on the skin material 11 side is melted. The pressurizing pressure is such that at least when the binder resin is melted, the wood fiber 6 is exposed and the PVC of the melted skin material 11 is brought into close contact. In this embodiment, the design of the skin material 11 is designed. The size is such that the sheet 17, the foam sheet 15, and the fixing sheet 13 are each completely fixed.

After the exposure to the high frequency, the wood molded article 1 can be obtained by cooling and appropriately treating the base material 5 and / or the end of the skin material 11 and the like.
In this manufacturing method, the PVC of the skin material 11 is heated and melted by applying a high frequency in a state where the adhesive material is disposed between the base material 5 and the skin material 11, and the binder resin of the base material 5 is melted. It is melted by heat generated from PVC. Therefore, the adhesive material can be brought into contact with the surface of the wood fiber exposed from the binder resin melted by pressurization before the PVC, and the laminated portion 28 of the wood fiber, the adhesive material, and PVC is easily formed. can do.
In particular, the wood fiber is in a fibrous form, and even when the adhesive material is melted, the surface fiber is not easily lifted from the base material 5, and even if the fiber is lifted, it is integrated with other parts of the base material 5 by the strength of the fiber itself It is in. Therefore, unlike the case where powdery or granular woody material is used, the adhesion strength of the wood fiber to the base material 5 is high, and by adhering the skin material 11 to this wood fiber via an adhesive material, Stable adhesive strength can be obtained.

  Further, since a nitrile rubber-based adhesive material is used as the adhesive material, it hardly adheres to the binder resin of the base material 5. Therefore, even if an adhesive material is applied to the entire surface of the base material 5, the adhesive material adheres to the skin material 11 except for the fixing portion 25, and the skin material 11 and the base material 5 do not adhere. For this reason, it can handle and manufacture a wooden molded object by the method similar to the past, without worrying about generation | occurrence | production of a wrinkle and position shift by adhesion | attachment through the adhesive material of the skin material 11 and the base material 5. Simple.

After collection, the dried kenaf fiber obtained by microbial treatment is mixed with polypropylene fiber at a weight ratio of 50:50, and a web with a kenaf weight of 1500 g / m ² is obtained by curd, fleece and air lay. Was formed and needle punched to form a mat. Then, it pressure-molded at 230 degreeC and obtained the base material which consists of a wood fiber which has the shape of a door trim. The base material had a thickness of 2.5 mm, and the kenaf density at this time was 0.3 g / cm ³ .
On the surface of this base material, an adhesive material solution prepared by dissolving NBR adhesive material (“Hybon 2320S” manufactured by Hitachi Chemical Co., Ltd.) in toluene so as to have a concentration of 20 wt% is 100 g / cm ² or more. And applied by spray. Next, after drying at 60 ° C. for 1 minute or longer, a 0.4 mm-thick polyvinyl chloride sheet, a 3 mm-thick slab urethane, and a 0.4 mm-thick polyvinyl chloride sheet prepared by a known method are obtained. After stacking in order, it was set in a known high frequency welding apparatus.
Maintaining an output current of 1.1 to 1.2 A, applying power of a frequency of 28 MHz for 10 seconds, as shown in FIG. 1, four linear adhering portions extending in parallel at 25 mm intervals are provided at the lower portion of the door trim. Created. This wood molding was taken as an example.
Further, a wood molded body was prepared under the same conditions except that no adhesive material was applied, and was used as a comparative example.

About the obtained Example and the comparative example, the peeling strength of the adhering site | part was measured.
Test pieces with a width of 25 mm were collected from 12 locations indicated by numbers surrounded by circles in FIG.
Next, with respect to this sample, as a 180 ° peel test, the substrate and the outermost polyvinyl chloride sheet are sandwiched between different grips of a tensile tester, respectively, and the pulling speed is set to a direction in which the angle between them becomes 180 °. The sample was pulled at 200 mm / min, and the tensile force when the fixed part was broken was measured.
The results are shown in Table 1.

  In the examples, the adhesive strength as a whole increased compared with the comparative examples, and the average was 9N larger. In particular, the minimum value is 25N, which is, for example, much higher than 15N required as an interior material of a vehicle, and it has become clear that each part is firmly fixed. On the other hand, in the comparative example, although the average value was significantly higher than 25N and 15N, the minimum value was lower than 12N, and it was revealed that the fixing was partially insufficient. As described above, according to the method of the present invention, it has been clarified that a woody molded body including a PVC skin material that is firmly fixed as a whole can be obtained.

It is a front view of the door trim which is one embodiment of the wooden molded body according to the present invention. It is sectional drawing which shows the adhering site | part of the wooden molded object which concerns on this invention. It is an enlarged view of the adhering site | part of the wooden molded object which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Wood molded object 5 Base material 6 Wood fiber 7 Binder resin 11 Skin material 13 Adhesive sheet 15 Foam sheet 17 Design sheet 21 Adhesive material 25 Adhered part 27 Anchor part 28 Adhesive part

Claims (3)

  A base material comprising a wood fiber and a binder resin containing polyolefin and / or polyester for binding the wood fiber, and a skin material in which at least a portion fixed to the base material is formed of a sheet made of polyvinyl chloride An adhesive material having adhesiveness is disposed between both the polyvinyl chloride and the wood fiber, and a high frequency at which molecular friction of the polyvinyl chloride occurs on the portion where the base material and the skin material are fixed is applied and pressed. A method for producing a wood-molded article provided with a skin, wherein the skin material is fixed to a substrate.   The method for producing a woody molded article according to claim 1, wherein the adhesive material is a nitrile rubber. A base material having a wood fiber and a binder resin containing polyolefin and / or polyester for bonding the wood fibers;
A skin material comprising a polyvinyl chloride layer that is at least partially secured to the surface of the substrate;
A wooden molded body comprising
The polyvinyl chloride layer completely anchors the wood fiber exposed from the binder resin; and
A wood-molded article having an epidermis, characterized in that a wood fiber surface is provided with an adhesive portion bonded to a polyvinyl chloride layer via an adhesive material.

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