JP2021014118A - Flat plate product and its manufacturing method - Google Patents

Abstract

To provide a manufacturing method for a flat plate product capable of obtaining a composite flat plate product from different plate materials even with a relatively low pressing force, and a flat plate product.SOLUTION: A manufacturing method for a flat plate product 100 includes a step of joining a flat plate-shaped fiber-containing plastic plate 20 to both sides of a flat plate-shaped core plate 10 by pressing processing. In the manufacturing method of the present invention, the fiber-containing plastic plate is subjected to local heating in which a part thereof is heated prior to such joining.SELECTED DRAWING: Figure 1

Description

The present invention relates to a flat plate product and a method for producing the same. More specifically, the present invention relates to flat plate products composed of different plate materials, and also relates to a method for producing such flat plate products.

Plate-shaped products such as flat plates have been used for various purposes because of their highly versatile shape. For example, plate-shaped products are used for building materials and furniture materials.

Plate-shaped products such as those used for building materials and furniture are required not only to have shape requirements but also to exhibit desired characteristics such as low cost and high strength. ..

Japanese Unexamined Patent Publication No. 1-163062

The inventor of the present application noticed that there are still problems to be overcome with the previously proposed plate-shaped products, and found the need to take measures for that purpose. Specifically, the inventor of the present application has found that there are the following problems.

For example, the plate-shaped product disclosed in Patent Document 1 is proposed as a laminated plate in which the entire plywood is enclosed. Specifically, in Patent Document 1, a fiber-reinforced thermoplastic resin member is heated and melted at about 200 ° C., and the molten material is subjected to fluid molding as a whole under high pressure using a molding machine. The material around the plywood is wrapped and enclosed.

However, such a technique requires a pressing force of 100 to 250 kg / cm ² for fluid molding the molten resin material. In other words, in order to manufacture a plate-shaped product having such a configuration as a large-area plate-shaped product for building materials, furniture materials, vehicle applications, etc., a very large press molding machine is required, which requires capital investment, etc. It will be an excessive investment in terms of points.

As a result of diligent studies based on this, the inventors of the present application have come up with the idea of actively utilizing vacuum forming / pressure forming equipment, which is a relatively large-scale mass production equipment in Japan, to more preferably manufacture plate-shaped products. However, this time I realized that there was a problem due to the utilization of such equipment.

Specifically, the relatively large vacuum forming / compressed air forming equipment existing in Japan does not have a high pressure system like a conventional press forming machine. That is, in the press-molding in such a large vacuum forming and pressure forming equipment, a very low pressure (e.g., 20 to 50 kg / cm ² or less ^{1~30kg / cm 2, 1~20kg / cm} 2 or 5 (Pressure pressure of ~ 20 kg / cm ² ) is only applied, and it cannot be said that it is sufficient for producing the plate-shaped product as described above.

The present invention has been made in view of such a problem. That is, a main object of the present invention is to provide a technique capable of producing a desired flat plate product even with a relatively low pressing force, particularly a technique capable of obtaining a flat plate product composed of different plate materials with a low pressing force. That is.

The inventor of the present application has attempted to solve the above-mentioned problems by dealing with it in a new direction, instead of dealing with it as an extension of the prior art. As a result, the invention of a flat plate product that achieved the above-mentioned main purpose was reached.

In the present invention, it is a method for manufacturing a flat plate product.
It consists of a process of joining flat fiber-containing plastic plates to both sides of the flat core plate by pressing.
A method for producing a flat plate product is provided in which the fiber-containing plastic plate material is subjected to local heating in which a part thereof is heated prior to the joining.

According to the present invention, a desired flat plate product can be obtained with a relatively low pressing force.

More particularly, the present invention is, without requiring high pressure such 100~250kg / cm ² 100kg / cm ² or more, to obtain a flat product fiber-containing plastic sheet is formed by conjugated to both sides of the core plate be able to. In particular, it is possible to successfully manufacture a large-area flat plate product without using a means such as a mold that involves a high pressing force. This means that even relatively large vacuum forming and compressed air forming equipment existing in Japan can be actively utilized, and large-area flat plate products can be manufactured while suppressing excessive capital investment. The benefits that can be provided.

FIG. 1 is a process cross-sectional view schematically showing the manufacturing method of the present invention (FIG. 1 (i): preparation of raw material plate material, FIG. 1 (ii): local heating, FIG. 1 (iii): pressure bonding. ). FIG. 2 is a process cross-sectional view showing more concretely an exemplary manufacturing method of the present invention (FIG. 2 (I): initial state, FIG. 2 (II): local addition to one fiber-containing plastic plate material. Warm). FIG. 3 is a process cross-sectional view showing a more specific example of the manufacturing method of the present invention (FIG. 3 (I): pressure bonding treatment, FIG. 3 (II): local to the other fiber-containing plastic plate material. Warming). FIG. 4 is a process cross-sectional view showing more concretely an exemplary manufacturing method of the present invention (press bonding process). FIG. 5 is a perspective view and a partially enlarged side view schematically showing the flat plate product of the present invention. FIG. 6 is a development view and a partially enlarged side view schematically showing the flat plate product of the present invention (FIG. 6 (a): fibers dispersed throughout the plate material, FIG. 6 (b): layered fibers). .. FIG. 7 is a schematic view for explaining a fiber-containing plastic plate having a more laminated form (5-layer structure). FIG. 8 is a schematic view for explaining the dimensions of a flat plate product according to a certain aspect. FIG. 9A is a schematic diagram for explaining one form of a local heating region in a fiber-containing plastic plate material according to one aspect of the present invention, and FIG. 9B is a schematic diagram according to a comparative technique. It is a schematic diagram for demonstrating one form of a heating region in a fiber-containing plastic plate material.

Hereinafter, the flat plate product of the present invention will be described in detail. Although the description will be given with reference to the drawings as necessary, the contents shown are merely schematic and exemplary for the purpose of promoting understanding of the present invention, and the appearance, dimensional ratio, and the like may differ from the actual product.

The term "planar view" referred to directly or indirectly in the present specification refers to a form in which an object is viewed from above or below along a thickness direction corresponding to a stacking direction of each layer constituting a flat plate product. Is based. Further, the "cross-sectional view" referred to directly or indirectly in the present specification is based on a form when viewed from a direction substantially perpendicular to the stacking direction of each layer constituting the flat plate product. In short, the cross-sectional view is based on the morphology obtained when cutting in a plane parallel to the thickness direction. The "vertical direction" and "horizontal direction" used directly or indirectly in the present specification correspond to the vertical direction and the horizontal direction in the drawings, respectively. Unless otherwise specified, the same reference numerals or symbols shall indicate the same members / parts or the same meanings. In one preferred embodiment, the vertical downward direction (that is, the direction in which gravity acts) corresponds to the "downward" / "bottom side", and the opposite direction corresponds to the "upward" / "top side". Can be done.

The various numerical ranges referred to herein are intended to include the lower and upper limits themselves, unless otherwise stated. That is, taking a numerical range such as 1 to 10 as an example, it can be interpreted as including the lower limit value "1" and the upper limit value "10" unless otherwise specified.

The present invention relates to a flat plate product and a method for producing the same. For convenience of explanation, the "manufacturing method of the present invention" will be described first, and then the "flat plate product of the present invention" will be described.

<< Manufacturing Method of the Present Invention >>
The manufacturing method of the present invention is a method for manufacturing a flat plate product. In particular, the present invention is a method for obtaining a flat plate product formed of a composite from different plate materials.

The present invention is characterized by at least a process of compounding raw material plates. Specifically, the manufacturing method of the present invention comprises a step of joining the flat plate-shaped fiber-containing plastic plate 20 to both surfaces (particularly both main surfaces) of the flat plate-shaped core plate 10 by a pressing process. It is subjected to local heating prior to joining (see FIGS. 1 (i)-(iii)). That is, in the manufacturing method of the present invention, the fiber-containing plastic plate 20 is joined to the core plate 10 while maintaining the flat state of both the flat core plate 10 and the flat fiber-containing plastic plate 20. Specifically, as local heating, only a part of the fiber-containing plastic plate 20 is heated. That is, preferably, only the surface layer or the surface layer portion of the fiber-containing plastic plate 20 is surface-heated.

With local heating, the fiber-containing plastic plate is exposed to higher temperature conditions such that only a portion of the fiber-containing plastic plate melts or semi-melts. That is, "local heating" as used herein does not mean that the fiber-containing plastic plate is completely completely melted (hereinafter, also simply referred to as "melting") or semi-melted, but a part of the fiber-containing plastic plate. Substantially refers to the process of locally melting or semi-melting only. The term "melting or semi-melting" as used herein refers in a broad sense to a state in which it is soft enough to be deformed by an external force (particularly, a state in which it is relatively softer than before heating), and in a narrow sense. , Refers to a state in which it becomes relatively softer than before heating and exhibits adhesiveness to other members.

Preferably, as local heating, only one main surface of the fiber-containing plastic plate 20 is heated (see FIG. 1 (ii)). It can be said that the fiber-containing plastic plate material is preferably heated on one side. That is, as shown, only the surface portion of the fiber-containing plastic plate is heated. In particular, only the main surface 20A located on the side directly facing the core plate material 10 (more specifically, the side to be bonded to the core plate material 10) is subjected to heating. By such heating, only the surface portion of the main surface of the fiber-containing plastic plate material is melted or semi-melted, and the fiber-containing plastic plate material is preferably bonded to the core plate material.

The surface portion 21 partially melted or semi-molten in the fiber-containing plastic plate 20 by local heating particularly contributes to the bonding with the core plate 10 (see FIGS. 1 (ii) and (iii)). On the other hand, most of 22 other than the melted portion on the surface of the fiber-containing plastic plate 20 contributes to maintaining the original state of the fiber-containing plastic plate (see FIGS. 1 (ii) and (iii)). Therefore, while the fiber-containing plastic plate 20 and the core plate 10 are compositely integrated, the finally obtained flat plate product 100 can easily maintain the desired physical properties initially possessed by the fiber-containing plastic plate 20.

Local heating according to the production method of the present invention melts some of the fiber-containing plastic plates while leaving the rest unmelted. That is, in the present invention, in the fiber-containing plastic plate material, two states of a "melted portion" and a "non-melted portion" may temporarily exist. The molten portion contributes to joining the core plate material and the fiber-containing plastic plate material when they come into contact with each other, while the non-melted portion advantageously contributes to applying a low pressing force. More specifically, the molten portion of the fiber-containing plastic plate material develops adhesiveness due to the contained plastic, and the adhesiveness assists in joining the core plate material and the fiber-containing plastic plate material. On the other hand, the non-melted portion is a portion in which the original rigidity of the fiber-containing plastic plate material is substantially maintained as it is, and therefore, the force applied to the fiber-containing plastic plate material from the outside causes deformation of the fiber-containing plastic plate material, etc. It is hard to be consumed to another energy of, and it becomes easy to act as a significant pressing force. Therefore, the presence of a non-melted portion (a portion that is not completely melted or semi-melted) in the fiber-containing plastic plate material effectively contributes to the realization of joining under low pressure.

In the production method of the present invention, local heating may melt only a thickness region of, for example, half or less of the total thickness of the fiber-containing plastic plate. That is, local heating can be performed so that only a thickness region of half or less of the total thickness of the fiber-containing plastic plate is in a completely melted state or a semi-melted state. This means that the thickness of the fiber-containing plastic plate is "T", and the thickness that is melted or semi-melted by local heating (melting / semi-melting depth from the heated surface) is "t". Then, it means that 0 <t ≦ T / 2 can be satisfied. In particular, it is preferable that heating is performed so that the fiber-containing plastic plate is melted from the surface of the main surface on the side where the core plate is positioned to the depth of the "thickness of half or less". .. As a result, when the core plate material and the fiber-containing plastic plate material come into contact with each other, the molten portion contributes to their joining, while the non-melted portion of the fiber-containing plastic plate material acts as a pressing force (the fiber-containing plastic plate material becomes the core plate material). The action of the pressing force on the surface) will contribute more effectively.

The more effective application of pressing force due to the non-melted portion of the fiber-containing plastic plate aids the joining at lower pressing force, so the degree of "local heating" when this point is more important. May be reduced. Regarding this, the heating may be such that only the local region of the thickness region of 1/3 or less or 1/4 or less of the total thickness of the fiber-containing plastic plate material is melted. That is, assuming that the thickness of the fiber-containing plastic plate is "T" and the thickness that is melted or semi-melted by local heating (melting / semi-melting depth from the heated surface) is "t". , 0 <t ≦ T / 3, 0 <t ≦ T / 4, and the like.

In other words, by "local heating", the fiber-containing plastic plate is joined to the flat core plate in a state where only the local thickness portion consisting of the surface and the region near the surface is melted. .. In such an embodiment, the non-melted portion is likely to be provided in the fiber-containing plastic plate material, and the non-melted portion can advantageously contribute to the application of a low pressing force from the above viewpoint. The "neighborhood region" referred to here is a region corresponding to the above-mentioned thickness "t" that is melted or semi-melted.

In one preferred embodiment, the fiber-containing plastic plate is a thinner plate than the core plate. That is, the total thickness of the fiber-containing plastic plate may be smaller than the total thickness of the core plate. In the present invention, even with such a relatively thin fiber-containing plastic plate material, a flat plate product can be obtained by locally heating the non-melted portion of the fiber-containing plastic plate material by utilizing the action of pressing force. ..

The production method of the present invention will be described in more detail with reference to FIGS. 2 to 4 in which an exemplary embodiment is shown. As shown, the production method of the present invention may use the heating means 200 for performing local heating. In the present invention, a heating means capable of heating without contact may be used. As the heating means 200, for example, a heating heater and / or a heating furnace may be used. In particular, "local heating" may be performed using the heating means 200 located proximal to one main surface of the fiber-containing plastic plate 20. For example, the "proximal heating means" may be a heater, for example, one based on IR heating (heating using infrared rays). In the broad sense, "arranged proximally to the main surface" as used in the specification of the present application means that only the surface layer or the surface layer portion of the fiber-containing plastic plate material faces the main surface so that the surface can be heated ( It means that the heating means are arranged (preferably so as to face each other directly). In a narrow sense, "located proximal to the main surface" means that the main surface and the heating means are separated by a centimeter order, for example, the separation distance is 70 cm or less, 50 cm or less, 30 cm or less, 20 cm or less. , 15 cm or less or 10 cm or less, which means that they face each other.

The heater may be movable. In the case of a movable heater, for example, the heater 200 may move in the horizontal direction to perform local heating (see FIGS. 2 to 4). In such a case, it is preferable that the heater 200 moves in the horizontal direction so as to be in a positional relationship directly facing one main surface 20A of the fiber-containing plastic plate 20 (see FIGS. 2 (I) and 2 (II)). .. Then, when the local heating is completed, it is also preferable that the heater can be moved in the horizontal direction again so as to move away from the main surface (see FIGS. 3 (I) and 4).

It is preferable that the main surface 20A of the fiber-containing plastic plate 20 is temporarily heated to 180 ° C. to 270 ° C. by a heater. More specifically, the main surface 20A may be once heated to 220 to 270 ° C. or 240 to 260 ° C., for example, to 250 ° C. In the present invention, the main surface 20A of the fiber-containing plastic plate 20 is heated in such a temperature range for, for example, 2.0 to 9.0 minutes or 2.0 to 7.0 minutes, preferably 2.0 to 4 minutes. It may last for 0.0 minutes or 2.5-3.5 minutes.

There is no limitation on the type of heater as long as it can perform "local heating". For example, the heating heater may be a heater that falls into the category of electric heating, and therefore resistance heating type (direct resistance heating type and / or indirect resistance heating type), infrared heating type (near infrared heating type, mid-infrared heating type). (And / or far-infrared heating), microwave heating, dielectric heating (high frequency dielectric heating and / or low frequency dielectric heating), induction heating (direct induction heating and / or indirect induction heating), arc heating , Electron beam heating type, plasma heating type, and at least one type of heater selected from the group consisting of laser heating type. Although only an example, the heater used in the present invention may be a so-called "ceramic heater".

The heater that performs "local heating" is not limited to the above-mentioned movable type, and may be a fixed type. Regarding this, the means for locally heating the fiber-containing plastic plate material may have, for example, the form of a heat treatment furnace. That is, "local heating" may be performed by temporarily providing a fiber-containing plastic plate material to the heating atmosphere by using a means for providing a heating atmosphere at a predetermined location. For example, the fiber-containing plastic plate may be temporarily subjected to a heating atmosphere while being moved in a predetermined direction by a conveying means such as a roller method or a walking beam method. The furnace that brings about such a heating atmosphere is not particularly limited, but falls into the category of, for example, a continuous heating furnace, a batch heating furnace, a rigid pit furnace, a flowing electric furnace, a mesh belt furnace, and the like. Good. The heating type of the furnace is not particularly limited to an electric type (that is, a type based on resistance heating, induction heating, dielectric heating, infrared heating or arc heating), and may be another type such as a combustion type. Although only an example, the heating furnace used in the present invention may be an IR heating furnace capable of heating based on infrared heating.

In the production method of the present invention, a covering member that partially covers the fiber-containing plastic plate may be used for "local heating". That is, the fiber-containing plastic plate may be subjected to heat treatment with the covering member provided. More specifically, the fiber-containing plastic plate material may be heat-treated with the covering member provided on at least a part other than the main surface corresponding to the side to be bonded to the core plate material. As a result, the portion covered with the covering member is not easily affected by the heat treatment, while the portion not covered with the covering member is easily affected by the heat treatment. Therefore, the use of such a covering member can promote suitable "local heating". The covering member is preferably made of a material having a low thermal conductivity (in other words, a material having a relatively high heat insulating property) such as wood. Further, since the covering member is provided only temporarily, it is preferably removed from the fiber-containing plastic plate material after "local heating" of the fiber-containing plastic plate material is performed.

In the production method of the present invention, the fiber-containing plastic plate material is subjected to "local heating" as described above, while the core plate material does not need to be subjected to such heating. That is, the core plate material may be used without being subjected to any special heat treatment. Therefore, while the fiber-containing plastic plate material is actively heated, the core plate material does not need to be particularly heated (the core plate material placed at room temperature may be used as it is), and such heating-applied states are mutually heated. Different plate materials may be combined. This does not necessarily mean that the core plate material should not be heated, but that the core plate material may be heated as needed. That is, the core plate itself is heated as long as it does not adversely affect the locally heated fiber-containing plastic plate, or rather has a positive effect on the locally heated state of such fiber-containing plastic plate. You may. For example, a core plate material placed at a temperature higher than room temperature (for example, a core plate material entirely exposed to a temperature higher than room temperature) may be attached to the fiber-containing plastic plate material.

Although it is only one example, if the core plate material is used as the above-mentioned "covering member", the core plate material can also be heated at the time of "local heating" of the fiber-containing plastic plate material. That is, the core plate material may be used once as a "coating member" in the "local heating" of the fiber-containing plastic plate material, thereby causing local heating of the fiber-containing plastic plate material and heating of the core plate material. Can be performed substantially simultaneously or in parallel.

In some embodiments, local heating of the fiber-containing plastic plate exposes the fiber-containing plastic plate to a temporary heating of less than 30 minutes. That is, the fiber-containing plastic plate is kept under heating for a relatively short period of time. For example, the heating means 200 is temporarily arranged so as to be proximal to one main surface of the fiber-containing plastic plate 20, or the fiber-containing plastic plate 20 is temporarily provided to the heating furnace. Good. In such cases, the temporary may be less than 30 minutes, for example less than 20 minutes or less than 15 minutes, more specifically 2-20 minutes, 2-15 minutes, 2-9 minutes or 2-7 minutes. And so on. As an example, the fiber-containing plastic plate material is temporarily attached to the fiber-containing plastic plate material 20 under heating by subjecting the fiber-containing plastic plate material 20 to the fiber-containing plastic plate material 20 for 2 to 15 minutes in a heating furnace in which the furnace atmosphere temperature is 150 ° C. to 300 ° C. You may. As a result, only the surface portion of the main surface of the fiber-containing plastic plate is likely to be melted or semi-melted, that is, "local heating" is likely to be brought about, and thus a desired flat plate product can be obtained. ..

The manufacturing method of the present invention does not require a high pressing force. Specifically, a pressing force of 100 to 250 kg / cm ² is not required, and the fiber-containing plastic plate material is joined to the core plate material by a pressing process corresponding to a pressing force lower than that. In particular, the fiber-containing plastic plate and the core plate maintain their flat plate morphology and join each other while the above-mentioned "partially melted or semi-molten surface portion" brought about by local heating comes into contact with the core plate. Will be done. More specifically, the fiber content as soon as possible after "local heating" (ie, in a state where the "partially melted or semi-melted surface portion" of the fiber-containing plastic plate is still maintained). It is subjected to a pressing process for joining the plastic plate to the core plate, but at that time, a high pressing force of 100 to 250 kg / cm ² is not required.

In the present invention, a flat plate product 100 is obtained from the raw material flat plate material while maintaining the "flat plate shape" as it is (see FIGS. 1 (i) to 1 (iii)). Therefore, a high pressing force of 100 to 250 kg / cm ² may be inconvenient for the "flat plate" in the first place. Such a high pressing force can cause deformation such as warpage in the flat plate product to be manufactured, or bring about an excessive pressure history in the flat plate product. That is, a high pressing force of 100 to 250 kg / cm ² increases the risk of impairing the initial physical properties of the raw material flat plate material. In this respect, in the manufacturing method of the present invention, a flat plate product is obtained with a lower pressing force, and such a risk is reduced. Due to the low pressing force, the present invention does not require a highly airtight pressurizing means such as a mold. That is, the joining in the present invention does not join the fiber-containing plastic plate material and the core plate material by applying a high pressing force by a highly airtight pressurizing means such as a mold, but a low pressing force without airtightness. Therefore, the fiber-containing plastic plate material and the core plate material are joined to each other.

As described above, the flat plate product 100 has a bending strength due to the fact that the "flat plate shape" can be maintained as it is from the raw material flat plate material and / or that it is not subjected to an excessive heat history due to local heating. And / It is easy to satisfy desired requirements in terms of physical properties such as bending elasticity, and therefore, it can be suitably used for building materials and furniture materials, and can also be widely and suitably used for vehicle applications and the like.

Pressure pressing process according to the present invention, a low pressure of less than 100 kg / cm ^2, for example be a 1~90kg / cm ^2, thus ^{1~80kg / cm 2, 1~70kg / cm} 2 or 1 It may be ~ 50 kg / cm ² . Focusing on the point of making the characteristics of the low pressing force of the present invention more apparent, the pressing force of the pressing process according to the present invention may be 1 to 30 kg / cm ² , and therefore 1 to 20 kg / cm ² . It may be 3 to 20 kg / cm ² , 4 to ²⁰ kg / cm ² or 5 to ²⁰ kg / cm ^{2, and the} like.

Since the manufacturing method of the present invention relies on a low pressing force, for example, it is preferable to perform a pressing process so as to sandwich the flat core plate 10 from the vertical direction with the same flat fiber-containing plastic plate 20 (FIG. 1 (FIG. 1). i) See (iii)). In other words, a low pressing force such as 1 to 90 kg / cm ² (hence 1 to 80 kg / cm ² , 1 to 70 kg / cm ² or 1 to 50 kg / cm ² ), or ^{2 to} 30 kg / cm ² (Therefore, 1 to 30 kg / cm ² , 1 to 30 kg / cm ² , ² to 20 kg / cm ² , 3 to 20 kg / cm ² or 4 to ²⁰ kg / cm ² ), etc. The fiber-containing plastic plate material may be pressed against the flat core plate material. Such a pressing process does not adversely affect the original flat plate form, and therefore the desired flat plate form can be obtained in the finally obtained flat plate product. Further, the pressing process by a low pressing force without airtightness as in the present invention is particularly easy to achieve when using a relatively large vacuum forming / compressed air forming facility. Therefore, the manufacturing method of the present invention is domestic. It is possible to positively utilize the relatively large vacuum forming / compressed air forming equipment existing in. Among such vacuum forming / compressed air forming equipment, it is particularly preferable to use the driving means in the pressing process according to the present invention.

The driving means of the vacuum forming machine will be described in detail. The driving means of the vacuum forming machine used in the manufacturing method of the present invention is a means that contributes to applying a pressing force from the outside to the fiber-containing plastic plate material arranged on the core plate material. Preferably, the driving means vertically drives a pressing member that is in direct contact with the "core plate material and the fiber-containing plastic plate material arranged on the core plate material" (hereinafter, also referred to as "flat plate precursor"). It has become.

For example, as shown in FIG. 2, the driving means of the vacuum forming machine includes pressing members 400 (400A, 400B) facing each other so as to form a pair. It is preferable that such a driving means includes at least an upper pressing member 400A and a lower pressing member 400B as the pressing member 400. The upper pressing member 400A and the lower pressing member 400B can be driven so as to be relatively close to each other or separated from each other, and the flat plate precursor can be pressed from the outside between them. For example, at least one of the upper pressing member and the lower pressing member is driven in the vertical direction by a hydraulic type, a hydraulic type, a pneumatic type (pneumatic type), or the like, so that the upper pressing member and the lower pressing member are relative to each other. It may be approaching or separating.

The manufacturing method of the present invention is only for obtaining a flat article as a whole. That is, using a flat plate raw material, a flat plate is manufactured as a finished product while maintaining the flat plate shape as it is. Due to the characteristics of such a "flat plate", the pressing surface used for the pressing process is preferably flat. That is, preferably, the pressing surface of the pressing means (that is, the surface in contact with the fiber-containing plastic plate 20) forms a flat surface. Explaining with reference to FIGS. 2 to 4, it is preferable that the pressing surfaces 410 and 420 of the pressing member 400 are flat. It can be said that the surface of the pressing member in contact with the "flat plate precursor" during the pressing process is not uneven like the mold surface, but is a relatively flat surface. This indirectly means that the present invention does not require the use of a die for compounding the raw material plate material. The material itself of the pressing member provided with the pressing surface is not particularly limited and may be a resin material and / or a metal material.

<< Flat plate product of the present invention >>
The flat plate product of the present invention can be obtained by the above-mentioned manufacturing method. 5 and 6 show an external perspective view and a developed view of the flat plate product 100 according to the present invention. As shown, the flat plate product 100 is made of a composite of different plate materials (10, 20).
Core plate 10 and
It has a fiber-containing plastic plate 20 provided on both sides of the core plate 10.

The flat plate product 100 of the present invention is obtained from a raw material flat plate material while maintaining its "flat shape", and both the core plate material 10 and the fiber-containing plastic plate material 20 are flat plates (FIG. 5). And see Figure 6).

As can be seen from the illustrated embodiment, in the flat plate product 100 of the present invention, the core plate material 10 is arranged so as to be interposed between the two fiber-containing plastic plate materials 20. That is, the core plate material 10 forms the inner layer, while the fiber-containing plastic plate material 20 forms the outer surface layer.

The "core plate material" as used in the specification of the present application means, in a broad sense, a plate material provided inside the laminated structure of flat plate products in the laminating direction, and in a narrow sense, in the middle of the laminated structure. It means a plate material corresponding to a layer. Such a core plate material preferably has a "flat plate shape" as its form.

On the other hand, the "fiber-containing plastic plate material" as used in the specification of the present application means, in a broad sense, a plastic plate material containing fibers, and in a narrow sense, a plastic plate material having a fiber layer inside. doing. The fiber-containing plastic plate material preferably has a "flat plate shape" as its form.

In the fiber-containing plastic plate material 20, the fibers 24 may be contained as a whole with respect to the plate material (see FIG. 6A), or may be unevenly distributed. In one preferred embodiment, the fiber-containing plastic plate 20 is a laminated plate (see FIG. 6 (b)). More specifically, the fiber-containing plastic plate material 20 may be a laminated plate material composed of the fiber layer 26 and the resin layer 28. In such a case, it is preferable that the fiber layer forms an inner layer. For example, when the laminated plate material of the fiber-containing plastic plate material 20 has a three-layer structure (FIG. 6 (b)), it is preferable that the middle layer thereof is the fiber layer 26. Similarly, when the laminated plate material of the fiber-containing plastic plate material 20 has a five-layer structure, it is preferable that the layers corresponding to the second layer and the fourth layer form the fiber layer 26 (see FIG. 7). As can be seen from such an example, when the laminated plate material is composed of three or more layers, it is preferable that the fiber layers and the resin layers are laminated alternately with each other.

The fiber content in the fiber-containing plastic plate 20 is 10 to 60% by weight, preferably 20 to 50% by weight, and more preferably 20 to 40% by weight based on the overall standard of the plate material. With such a content, the fiber-containing plastic plate material tends to provide suitable rigidity, and by extension, the flat plate product also tends to provide such suitable rigidity.

When the fiber-containing plastic plate 20 is composed of the fiber layer 26 and the resin layer 28, it is preferable that the resin layer 28 at least forms a surface layer (see FIGS. 6 (b) and 7). That is, it is preferable that the fiber layer forms the inner layer and the resin layer forms the outer layer. When the resin layer forms the surface layer and the outer layer, the resin layer of the surface layer and the outer layer is melted by "local heating" to the fiber-containing plastic plate material to develop adhesiveness more effectively, and the core plate material and the core plate material are formed. This is because the bonding with the fiber-containing plastic plate material can be effectively assisted.

The resin layer of the fiber-containing plastic plate is preferably a thermoplastic resin. That is, it is preferable that the resin layer is formed from a resin that is once melted when heated but then solidified again by heat removal. In the case of a thermoplastic resin, the resin layer is melted by "local heating" and is used for joining the core plate material and the fiber-containing plastic plate material, and then solidified. It becomes easy to be drowned.

The thermoplastic resin is not particularly limited, and is composed of, for example, polyolefin (for example, polyethylene and polypropylene), polyester (for example, polyethylene terephthalate), polyamide (for example, nylon 66), polyvinyl chloride, and polystyrene. At least one selected from the group.

Preferably, the thermoplastic resin of the resin layer in the fiber-containing plastic plate is a polyolefin-based resin. This is because the adhesiveness can be more preferably developed due to the melting of the resin layer by "local heating". As long as it is a polyolefin resin, there is no limitation on the type. For example, examples of the polyolefin resin include polyethylene, polypropylene, modified polyethylene, modified polypropylene, poly1-butene, poly1-hexene, poly4-methyl-1-pentene and the like. These polymers may be used alone or in combination of two or more. That is, the polyolefin resin may be a mixture of the above polymers.

In one preferred embodiment, the polyolefin-based resin contained in the resin layer of the fiber-containing plastic plate is a propylene resin. In the case of a propylene resin, the fiber-containing plastic plate material exhibiting more suitable strength and / or heat resistance and the like can provide a flat plate product suitable for use in a harsh environment.

The propylene resin may be a propylene homopolymer and / or a copolymer of propylene and another olefin. Examples of other olefins in the case of forming a copolymer of propylene and other olefins include the above-mentioned various olefins (excluding propylene).

Additives may be contained in the resin layer of the fiber-containing plastic plate material. Such additives include, for example, antioxidants, heat stabilizers, flame retardants, pigments, light stabilizers, UV absorbers, inorganic fillers, foaming agents, colorants, antiblocking agents, lubricants, antistatic agents and plasticizers. At least one selected from the group consisting of agents and the like can be mentioned.

When the fiber-containing plastic plate 20 is composed of a fiber layer 26 and a resin layer 28, the form of the fiber layer 26 is selected from at least a group consisting of needle punches, spun bands, thermal bonds, chemical bonds and stitch bonds. It may have a layer morphology due to one type. Further, the fiber layer 26 may be impregnated with a resin component. In such a case, the fiber layer 26 is preferably configured by being impregnated with a thermoplastic resin. The thermoplastic resin as an impregnating component may be the same resin type as the resin layer, or may be different from the resin layer.

The fibers contained in the fiber-containing plastic plate material are not particularly limited. Therefore, the fiber may be a chemical fiber, a natural fiber, or a mixed fiber thereof. For example, the fibers contained in the fiber-containing plastic plate may be chemical fibers and therefore synthetic fibers, semi-synthetic fibers, regenerated fibers and / or inorganic fibers. As synthetic fibers, aliphatic polyamide fibers (for example, nylon 6 fibers and nylon 66 fibers), aromatic polyamide fibers, polyvinyl alcohol fibers (for example, vinylon fibers), polyvinylidene chloride fibers, and polyvinyl chloride fibers. , Polyester fiber (for example, polyester fiber, PET fiber, PBT fiber, polyarylate fiber), polyacrylonitrile fiber, polyethylene fiber, polypropylene fiber, polyurethane fiber, phenol fiber, polyfluoroethylene fiber and the like. be able to. Examples of the semi-synthetic fiber include a cellulosic fiber and a protein fiber. Examples of the regenerated fiber include rayon fiber, cupra fiber, lyocell fiber and the like. Examples of the inorganic fiber include glass fiber, carbon fiber, ceramic fiber, silica fiber, metal fiber (for example, aluminum fiber and alumina fiber), rock wool and the like.

In one preferred embodiment, the fibers contained in the fiber-containing plastic plate are glass fibers. In the case of glass fiber, the fiber-containing plastic plate material exhibits more suitable rigidity, and it becomes easy to provide a flat plate product suitable for use in a harsh environment.

The fibers themselves may be short fibers, long fibers, or even hollow fibers. Further, the fiber used for the fiber cloth may be in the form of a yarn, and may be in the form of a twisted yarn obtained by twisting the fibers, for example.

In one preferred embodiment, the fibers contained in the fiber-containing plastic plate are long fibers. In the case of long fibers, the fiber-containing plastic plate material tends to exhibit more suitable rigidity, and a flat plate product suitable for use in a harsh environment can be obtained. For example, the fiber contained in the fiber-containing plastic plate may be a long glass fiber.

The average fiber length of the long glass fibers is usually 5 to 200 mm, preferably 10 to 100 mm, for example, 15 to 70 mm. The average fiber length refers to a value obtained by selecting any 10 fibers in a micrograph of a fiber-containing plastic plate and averaging their measured values.

The average fiber diameter of the long glass fibers is usually 3 to 50 μm, preferably 10 to 25 μm, for example, 12 to 23 μm. The average fiber diameter refers to a value obtained by selecting any 10 fibers in a micrograph of a fiber-containing plastic plate and averaging their measured values.

Since the flat plate product of the present invention is obtained by pressing the fiber-containing plastic plate material against the flat core plate material, the core plate material and the fiber-containing plastic plate material are directly bonded to each other. In other words, in the flat plate product of the present invention, an adhesive layer is not included between the fiber-containing plastic plate material and the core plate material. Therefore, the flat plate product has a relatively simple structure and is also excellent in terms of weight reduction.

Further, since the flat plate product of the present invention is obtained from the raw material flat plate material while maintaining its "flat shape" as it is, it is as proposed in the prior art (Japanese Patent Laid-Open No. 1-163062). It does not have an enclosed laminated structure. That is, as shown in FIG. 5, it preferably has a form in which the end faces of both the core plate material 10 and the fiber-containing plastic plate material 20 are exposed. That is, the end faces of both the core plate material 10 and the fiber-containing plastic plate material 20 form the side surface of the flat plate product 100. In other words, it can be said that the end face of the core plate material 10 and the end face of the fiber-containing plastic plate 20 are preferably flush with each other. In other words, the end faces of both the core plate 10 and the fiber-containing plastic plate 20 are exposed (all the end faces of the core plate 10 are visible from the outside, and the end faces of the fiber-containing plastic plate 20 are also exposed. Further, all of them preferably have a form that can be visually recognized from the outside).

Since the flat plate product of the present invention is obtained through "local heating", it has a feature directly derived from it. Specifically, the fiber-containing plastic plate 20, which is a component of the flat plate product 100, has a local melt-solidified portion 21'(see FIG. 5). The melt-solidified portion 21'is a portion where the resin layer is once melted, and also corresponds to a portion where the fiber existing in the layer or the lower portion is once attached to the springback. In some embodiments, it can be said that the melt-solidified portion 21'can correspond to a springback portion. Therefore, microscopically, such traces can be seen in the melt-solidified portion. That is, from a macroscopic point of view, the fiber-containing plastic plate material contained in the flat plate product may have the same appearance as before the production, but microscopically, it has such a melt-solidified portion 21'. Can make a difference.

The flat plate product of the present invention is a flat article. Since the flat plate product of the present invention is obtained from the flat plate-shaped core plate material 10 and the flat plate-shaped fiber-containing plastic plate material 20, both main surfaces have a planar shape as a whole. That is, the main surface of the flat plate product is a flat surface. Preferably, the flat plate product of the present invention does not require a high pressing force and is obtained by joining the fiber-containing plastic plate material to the core plate material by a pressing treatment corresponding to a low pressing force, so that the warp is small as a whole ( It is a flat plate product (preferably without warping). For example, the degree of warpage is within ± 3 mm, preferably within ± 2 mm, more preferably within ± 1 mm, for example within ± 0.8 mm or within ± 0.5 mm.

In one preferred embodiment, the core board is a wood board or a foam board. The wood board may be, for example, veneer board or veneer plywood. Such veneer plate or veneer plywood is preferable because it is a relatively inexpensive plate material while having appropriate rigidity. On the other hand, since the foam plate is a plate material having minute voids, it is preferable in terms of reducing the weight of the flat plate product. Examples of the foam board include a resin foam board (a PP-based foam board such as a polypropylene hard foam board, which is just an example). Although not particularly limited, the resin foam board may include a non-woven fabric as a skin layer.

In the flat plate product of the present invention, the fiber-containing plastic plate material and the core plate material may have the same thickness or may have different thicknesses from each other. In one aspect of the present invention, as shown in FIG. 8, the thickness of the core plate material 10 is larger than the thickness of the fiber-containing plastic plate material 20. Although it is merely an example, the thickness T ₂₀ (see FIG. 8) of the fiber-containing plastic plate 20 may be about 1 to 10 mm or 2 to 9 mm, and more limitedly, 2 to 8 mm or 2 to 6 mm. Alternatively, it may be 2 to 5 mm or the like. Therefore, in one aspect of the invention as shown in FIG. 8, the core plate 10 may have a thickness T ₁₀ that is greater than such a fiber-containing plastic plate 20. For example, the thickness of the core plate 10 is larger by 80% or less, larger by 70% or less, larger by 60% or less, and larger by 50% or less than the thickness of the fiber-containing plastic plate 20. Alternatively, it may be increased by a ratio of 40% or less.

The flat plate product of the present invention can be obtained by a manufacturing method suitable for increasing the area thereof, and may have a relatively large main surface size. That is, the flat plate product may have a large main surface size as an integrated main surface that is not a seam or the like. For example, in the plan view shape of the flat plate product, one dimension (for example, the largest dimension that can be considered in the plan view shape) may be 250 to 3000 mm, and therefore, in the plan view shape of the flat plate product, they are orthogonal to each other. One dimension may be 250-3000 mm and the other dimension may be 250-3000 mm. Further, in the plan view shape of the flat plate product, one dimension orthogonal to each other may be 700 to 1500 mm, and the other dimension may have a considerably large dimension such that it is 1600 to 3000 mm. That is, for example, one dimension La of the main surface of the flat plate product as shown in FIG. 8 can be 700 to 1500 mm, and the other dimension Lb of the main surface of the flat plate product can be 1600 to 3000 mm. In one preferred embodiment, La is 800 to 1400 mm or 850 to 1300 mm and Lb is 1700 to 2800 mm or 1750 to 2600 mm.

As described above, the flat plate product of the present invention easily satisfies the desired requirements in terms of structural properties such as bending strength and / bending elasticity, and is therefore suitable as a plate product for building materials, furniture materials, vehicle applications, and the like. Used. In one preferred embodiment, the flat plate product of the present invention is a vehicle floor plate. That is, the present invention is used as a flat plate product for a vehicle floor board.

Since other matters such as more detailed matters and further aspects of the flat plate product of the present invention are described in the above << Manufacturing Method of the Present Invention >>, the description here will be omitted in order to avoid duplication.

A verification test was conducted to confirm the effect of the present invention.

Flat plates were produced by local heating in the following four cases.

● Case 1
- plywood material having a core plate plane: wood material thickness: about 5.5mm

-GMT sheet with fiber-containing plastic plate flat surface (Glass-Mat reinforced Thermoplastic)
Sheet structure: Laminated structure composed of fiber layer and resin layer Fiber layer: Glass fiber layer, Resin layer: Thermoplastic resin layer A layer in which a resin layer is arranged on the surface layer and the resin layer contains an olefin resin Sheet thickness : Approximately 4 mm

-Local heating Local heating only on the surface of the fiber-containing plastic plate (using IR heating means). The fiber-containing plastic plate was temporarily exposed to IR heating (about 225 ° C./about 6 minutes) to locally melt only the vicinity of the surface of the fiber-containing plastic plate (less than half the total thickness of the fiber-containing plastic plate). Only the thickness region of was melted). That is, the fiber-containing plastic plate melts only the surface thereof and the local thickness portion in the region near the surface.

· Using a provided a press machine laminating vacuum forming, pressure forming equipment by low pressure, low pressure of 1~90kg / cm ^2, particularly 1~20kg / cm ² become 14.8 kg / cm ² pressure Fiber-containing plastic plates were laminated on both sides of the core plate by pressure to obtain a flat plate product. In particular, due to the low pressure applied, it was possible to obtain a flat plate product while maintaining the flat plate state as a whole for both the core plate material and the fiber-containing plastic plate material.


● Case 2
The conditions are the same as in Case 1 except that the core plate material is changed to a foam plate (MDF board with a thickness of 5.5 mm / Medium Density Fiberboard) and the low pressing force is changed to a pressing force of 8.6 kg / cm ^2. I got a flat plate product.

● Case 3
A flat plate product was obtained under the same conditions as in Case 1 except that the temperature and time of local heating were changed to about 195 ° C./about 12 minutes and the low pressing force was changed to 17.3 kg / cm ² .

● Case 4
A flat plate product was obtained under the same conditions as in Case 1 except that the core plate material was changed to a foam plate (resin foam board / thickness 5.5 mm) and the low pressing force was changed to 1.2 kg / cm ² . ..

The characteristics of the flat plate products obtained in Cases 1 to 4 were investigated. In particular, it was verified whether or not the adhesion between the core plate material and the fiber-containing plastic plate material is sufficient as the structural stability when the flat plate product is actually used. Specifically, a drill, a mallet, and a scraper were used as metal tools, and it was investigated whether or not the tool could be used by a person to peel off the core plate material and the fiber-containing plastic plate material.

As a result of such verification, it was found that Cases 1 to 4 are flat plate products having sufficient adhesion without peeling. As a result, we were able to understand the following in this verification test.

-A flat plate product can be obtained by locally heating the fiber-containing plastic plate material.

A desired flat plate product can be obtained even with a low pressing force of ^{1 to} 90 kg / cm ² . Further, since it can be obtained with such a low pressing force of less than 100 kg / cm ² , even a flat plate product having a large area has a small warp (or preferably no warp) due to the low pressing force. A flat plate product can be obtained.

-Although not bound by a specific theory, it is possible to obtain the desired adhesion even with such a low pressing force when the fiber-containing plastic plate is partially melted (locally on or near the surface). It is considered that one of the factors is that the core plate material is laminated in a state where only the local thickness portion is melted). That is, it is considered that one of the factors is that the fiber-containing plastic plate material is partially melted, and conversely, the unmelted portion remains. Such a non-melted portion is a portion in which the original rigidity of the fiber-containing plastic plate material is substantially maintained as it is, and the force applied to the fiber-containing plastic plate material from the outside is different from the deformation of the fiber-containing plastic plate material. It is hard to be consumed by the energy of the resin and easily acts as a significant pressing force.

-This time, the main surface size of the core plate material and the fiber-containing plastic plate material was about 270 mm x about 300 mm, but based on the above theory, the adhesion is similarly preferable even in the case of a larger main surface size. It is possible to obtain a flat plate product maintained at.

Although the embodiments of the present invention have been described above, they merely show typical examples in the scope of application of the present invention. Therefore, it will be readily appreciated by those skilled in the art that the present invention is not limited to the above embodiments and various modifications can be made.

For example, heating of only one main surface of the fiber-containing plastic plate material may be heating in such a form that the contained fibers are at least partially exposed on the heating surface. In the case of such heating, as shown in FIG. 9A, a phenomenon such as “springback” may occur on the locally heated surface. As can be seen from the illustrated form, the region where the fibers are projected by local heating is a region where the resin component is relatively reduced, so that the region can be a region where the strength / rigidity of the plate material is relatively reduced. (For example, in the case of total heating instead of local heating, it is conceivable that springback will occur as a whole as shown in FIG. 9B, and the strength / rigidity of the plate material will be greatly reduced. ). That is, the local heating region can bring about a reduction in the strength / rigidity of the fiber-containing plastic plate while exhibiting a bonding action with the core plate due to the component of the molten resin, and thus the finally obtained flat plate. It can bring about a reduction in strength / rigidity as a product. In this regard, in the present invention, such regions are limited and not excessively large due to the "locality" of heating. Therefore, in the present invention, the strength / rigidity of the fiber-containing plastic plate can be maintained while the fiber-containing plastic plate can be bonded to the core plate by local heating, and the finally obtained flat plate can be obtained. It is possible to obtain suitable strength / rigidity as a product.

Further, in the above description, the flat plate product of the present invention has been described based on the illustrated form. That is, the main surface shape of the flat plate product has been described as having a rectangular shape or a square shape. However, the present invention is not limited to such a shape, and the shape of the flat plate product may be a substantially circular shape, a substantially polygonal shape, or the like. The term "substantially circular" here means a shape that can be included in the concept of a circle in the broadest sense, including not only a perfect circle but also an ellipse or an oval shape (in short, mainly or most of them). The flat plate main surface may have a shape formed based on the curve). In addition, the "substantial polygon" is not limited to a polygon that is angular, but is a polygon in the broadest sense, including a shape in which one or more specific corners of the polygon are rounded. Means a shape that can be included in.

Further, the drawings (FIGS. 2 to 4) referred to in the above description are based on an embodiment in which a movable heater is used, but in the case of a fixed heater, there is a difference in the place where the process processing is performed. come. That is, in the case of a movable heater, the "step of locally heating the fiber-containing plastic plate" and the "step of joining the fiber-containing plastic plate and the core plate" are performed at the place where the press machine is installed. On the other hand, when a fixed heater is used, the fiber-containing plastic plate sent from the heat treatment furnace (that is, the fiber-containing plastic plate subjected to "local heating" in the heat treatment furnace) is transferred to the press. It is transferred and pressed. That is, those processes are performed in different places. Therefore, depending on whether a movable heater is used or a fixed heater is used, "local heating treatment" and "pressing treatment" are performed in the same place, or they are placed in different places. There can be a difference in whether to do it with.

Furthermore, in the above explanation, it was stated that a highly airtight pressurizing means such as a mold is not particularly required, but if the pressing surface used for joining the plate materials is flat, the gold is used. Pressing means, which can also be referred to as a mold, may be used. However, even in such a case, since it is "manufacturing a flat plate product" to the last, "sealing" as in a normal molding die is not required. That is, a pressing means that is an open die and the pressing surface forms a flat surface as a whole may be used.

The present invention can be used in various fields where flat plates are expected to be used. Although it is merely an example, the flat plate product according to the present invention can be used for building materials, furniture materials, or vehicle applications.

More specifically, since the flat plate product according to the present invention can be obtained as a flat plate product having a large area and exhibiting desired strength, it is a substitute for a vehicle floor plate such as a so-called "Apiton plate" in vehicle applications. Can be suitably used as.

100 Flat plate 10 Core plate 20 Fiber-containing plastic plate 20A One main surface of fiber-containing plastic plate 21 Melted / semi-melted surface part (melted part)
21'Local melt-solidified part 22 Most of the surface other than the melted part (non-melted part)
24 Reinforcing fiber 26 Fiber layer 28 Resin layer 200 Heating heater 400 Pressing member 400A Upper pressing member 400B Lower pressing member 410 Pressing surface 420 Pressing surface

Claims (22)

A method for manufacturing flat plates
It includes a step of joining flat fiber-containing plastic plates to both sides of the flat core plate by pressing.
A method for producing a flat plate product, in which the fiber-containing plastic plate material is subjected to local heating in which a part thereof is heated prior to the joining. The flat plate according to claim 1, wherein the fiber-containing plastic plate material is joined to the core plate material in a state where only a locally thick portion composed of a surface thereof and a region near the surface is melted by the local heating. How to manufacture the product. The method for producing a flat plate product according to claim 1, wherein only a region having a thickness of half or less of the fiber-containing plastic plate is melted by the local heating. The method for producing a flat plate product according to any one of claims 1 to 3, wherein the pressing force in the pressing process is 1 to ²⁰ kg / cm ² . The method for producing a flat plate product according to any one of claims 1 to 4, wherein only one main surface of the fiber-containing plastic plate material is subjected to the heating. The method for producing a flat plate product according to any one of claims 1 to 5, wherein the local heating is performed by using a heating means located proximal to one of the main surfaces. The method for producing a flat plate product according to any one of claims 1 to 4, wherein in the heating of the fiber-containing plastic plate material, the fiber-containing plastic plate material is subjected to temporary heating for less than 30 minutes. The method for producing a flat plate product according to any one of claims 1 to 7, wherein a driving means of a vacuum forming machine is used for the pressing process. The method for manufacturing a flat plate product according to any one of claims 1 to 8, wherein the pressing surface used for the pressing process is flat. It is a flat plate product that is composited from different plate materials.
Core plate and
It is composed of a fiber-containing plastic plate material provided on both sides of the core plate material.
A flat plate product in which both the core plate material and the fiber-containing plastic plate material are flat plates. The flat plate product according to claim 10, wherein both end faces of the core plate material and the fiber-containing plastic plate material are exposed. The flat plate product according to claim 10 or 11, wherein the fiber-containing plastic plate material is a laminated plate material composed of a fiber layer and a resin layer. The flat plate product according to claim 12, wherein the resin layer at least forms a surface layer of the laminated plate material. The flat plate product according to claim 12 or 13, wherein the resin layer contains a thermoplastic resin. The flat plate product according to claim 14, wherein the thermoplastic resin is a polyolefin resin. The flat plate product according to claim 14 or 15, wherein the thermoplastic resin is a propylene resin. The flat plate product according to any one of claims 10 to 16, wherein the fiber layer contains long glass fibers. The flat plate product according to any one of claims 10 to 17, wherein the core plate material and the fiber-containing plastic plate material are directly bonded to each other. The flat plate product according to any one of claims 10 to 18, wherein the fiber-containing plastic plate material has a local melt-solidified portion. The flat plate product according to any one of claims 10 to 19, wherein the core plate material is a wood material plate or a foam plate. The flat plate product according to any one of claims 10 to 20, wherein in the plan view shape of the flat plate product, one dimension orthogonal to each other is 700 to 1500 mm, and the other dimension is 1600 to 3000 mm. The flat plate product according to any one of claims 10 to 21, wherein the flat plate product is a vehicle floor plate.