JP2007113335A - Floor panel in double flooring material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a floor panel formed by using a composite material formed mainly of a container packaging recycled material for novel applications of the container packaging recycled material. <P>SOLUTION: In this floor panel in a double flooring material, the floor panel 2 is formed of the composite material including a thermoplastic resin formed of the container packaging recycled material provided by collected plastic waste and a filler formed of an inorganic powder. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a component of a double floor in which a floor panel is disposed on a floor foundation via a space, and more particularly to the floor panel.

  In the western floor structure of an apartment house such as an office or an apartment, a space may be provided between the floor foundation surface and the floor surface to form a double floor, and electrical wiring and piping may be provided in the space.

  In order to construct such a double floor, it is necessary to support the floor panel at a predetermined height from the floor foundation surface and to connect the floor panels, and the members used for these constructions must be shared. This is advantageous in terms of member management and cost.

Conventionally, it is publicly known that the intermediate support of the floor panel and the cross-shaped cross connection of the floor panel are performed by a common member (see Patent Document 1).
In JP-A-7-233614, as shown in FIG. 5A, the parallel pieces 11x and 11x are sandwiched on the base plate 11 'by sandwiching the x axis and the parallel pieces 11y are sandwiched by the y axis. 11y symmetrically and using a support leg in which a 45 ° -insertion piece 11z is provided between the x-axis parallel piece 11x and the y-axis parallel piece 11y, A in FIG. As shown, the cross-shaped intersections of the grid-like ribs of the floor panel and the center of the support legs are made coincident, and the grid-like ribs 22x, 22y of the floor panel are placed between the side-by-side pieces 11x, 11x and between the side-by-side pieces 11y, 11y. The middle part of the back surface of the floor panel is supported by fitting, and as shown by B in FIG. 5 (B), the corner corner 22z of the outer peripheral rib of the floor panel is fitted with the side piece 11y of the supporting leg and the insertion piece. 11z and side-by-side pieces 11x are held together to connect and support the crossing points of the floor panel cross Is disclosed.

  By the way, the plastic waste collected by the local government is a mixture containing a thermoplastic resin such as polyolefin resin, PET, polystyrene, and inorganic substances (metals), and an effective recycling method is desired. In particular, it is desired to develop a new application of a container and packaging recycling material obtained from recovered plastic waste and excluding PET resin. However, the container and packaging recycle material is usually inhomogeneous, and there are several difficulties in using it at the industrial level.

  An object of the present invention is to provide a floor panel for double flooring using a composite material mainly composed of container packaging recycling material as a new use of container packaging recycling material.

According to the first aspect of the present invention, a floor panel having grid-like ribs on the back surface of the square top plate and a support plate are fitted to the rib grids of the floor panel, or the floor panel is cross-linked. Or a common floor panel support leg to which the floor panel side is connected. The support plate of the floor panel support leg is provided with protrusions at positions corresponding to the four corners of the square lattice of the floor panel. The outer portion of the four protrusions is fitted to the corners of the rib intersections at the four corners so that positioning is performed, and the inner portions of the protrusions are cross-linked with the floor panel. The four ribs are opposed to the four projections, with the distance between the outer peripheral ribs being L and the thickness of the ribs being t on the floor panel side to be connected. Within In a double-flooring that is the distance b is approximately between sites (L + 2t),
A floor in a double flooring characterized in that the floor panel is made of a composite material including a thermoplastic resin made of a container and packaging recycling material obtained from recovered plastic waste and a filler made of an inorganic powder. It is a panel.

  The invention according to claim 2 is the floor panel in the double flooring according to claim 1, wherein the inorganic powder is fly ash.

  The invention according to claim 3 is characterized in that the container and packaging recycle material contains at least 20% by weight of polypropylene, 30 to 70% by weight of polyethylene, and 3 to 30% by weight of polystyrene. It is a floor panel in heavy flooring.

  The invention according to claim 4 is the floor panel in the double flooring according to any one of claims 1 to 3, wherein the composite material further contains an unsaturated carboxylic acid-modified thermoplastic resin.

  The invention according to claim 5 is the floor panel in the double flooring according to claim 4, wherein the unsaturated carboxylic acid-modified thermoplastic resin is maleic anhydride-modified polypropylene.

  The invention according to claim 6 is the floor panel in the double flooring according to any one of claims 1 to 5, wherein the composite material further contains a styrene-olefin copolymer.

  The invention according to claim 7 is the floor panel in the double flooring according to claim 6, wherein the styrene-olefin copolymer is a styrene / ethylene / butylene / styrene copolymer.

  The invention according to claim 8 is characterized in that the thermoplastic resin and the filler are stirred at a high speed to melt the thermoplastic resin, the two materials are mixed, and the mixture is press-molded and shaped. It is a manufacturing method of the floor panel for double flooring in any one of 1-7.

  In the invention according to claim 9, the outer shell surrounding one protrusion is square, and auxiliary ribs are attached to both the lateral and vertical directions inside the outer peripheral rib of the floor panel with an interval of one side length c. The floor panel in the double flooring material according to any one of claims 1 to 8, wherein auxiliary lattices having an inner dimension of c x c are provided at four corners of the outer peripheral rib.

  The invention according to claim 10 is characterized in that an auxiliary projection is provided at the center of the four projections of the support plate of the floor panel support leg, and the floor panel in the double flooring according to any one of claims 1 to 9 It is.

  According to an eleventh aspect of the present invention, auxiliary ribs in contact with the rib lattice are provided on the top plate portion in the rib lattice of the floor panel, and the height T2 of the auxiliary rib is equal to the height T1 of the lattice rib. It is set as T2 <T1-T3 with respect to height T3 of a processus | protrusion, It is a floor panel in the double flooring in any one of Claims 1-10 characterized by the above-mentioned.

  The invention according to claim 12 is the floor panel in the double flooring according to claim 11, wherein the auxiliary ribs are provided so as to connect the apexes facing each other of the lattice.

  The invention according to claim 13 is the floor panel in the double flooring according to claim 11 or 12, wherein the height of the auxiliary ribs is increased to reach the center in the rib lattice of the floor panel. is there.

  According to the present invention, by adding inorganic powder as a filler to a container and packaging recycling material obtained from recovered plastic waste, a new application of a mixture of these as a molding material for floor panels for double flooring Can be used. Further, it is possible to provide a floor that is highly effective in reducing the floor impact sound level required when the floor material is used.

  Furthermore, the physical properties of the floor panel obtained by adding an unsaturated carboxylic acid-modified thermoplastic resin and / or a styrene-olefin copolymer, particularly impact resistance, can be improved.

  As described above, the present invention has significant significance in terms of cost and society by handling heterogeneous recycled resin.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  The figure shows a floor panel and a floor panel support leg constituting a double flooring.

  1-1 (a) is a top view of the floor panel support leg, and (b) of FIG. 1-1 is a side view of the floor panel support leg.

  FIG. 1-2 shows a rear view of the floor panel, and a grid-like rib 22 is provided on the rear surface of the top plate 21.

  FIG. 1-3 shows the fitting state of the support plate 11 of the floor panel support leg to the back surface of the floor panel 2, the cross-shaped cross connection state of the floor panel by the support plate 11, and the connection state between the floor panel sides (upper right). Show.

  As shown in FIGS. 1-1 and 1-3, the support plate 11 of the floor panel support leg 1 has protrusions 110, 110 at positions corresponding to the four corners of the square lattice 220 of the grid-like ribs 22 of the floor panel. As shown in FIG. 1-3, the outer portion 1101 is fitted to the rib crossing corner 2201 of the rib lattice 220 of the lattice rib 22 of the floor panel 2 as shown in FIG. As shown in the upper right of FIG. 1-3, the portions 1102 inside the projections 110 are fitted into the right corners 2211 at the four corners of the outer peripheral rib 221 of the floor panel 2. .

  The outer shape of each of the projections 110 is a square having a dimension c × c, and in order to make the fitting inside the right-angle corners of the four corners of the outer peripheral rib of the floor panel at the inner portion of each projection described above, As shown in FIG. 1-2, auxiliary ribs 221x and 221y are attached to the inner side of the outer peripheral rib 221 of the floor panel 2 in both the horizontal direction and the vertical direction with an interval of the length c of one side of the square dimension c × c. Auxiliary lattices 2210 having an inner dimension c × c are provided at the four corners of the outer peripheral rib 221 of the floor panel.

  As is clear from FIG. 1-2, between the interval L between the outer peripheral ribs of the connected floor panels, the rib thickness t, and the interval b of the inner portion 1102 facing the protrusion 110 of the floor panel support leg 1, There is a relationship of L = b−2t, and as is clear from FIG. 1C, the dimension a × a of the rectangular outline surrounding the four protrusions 110 to 110 is the lattice 220 of the lattice ribs 22 of the floor panel 2. The relation is equal to the inner dimensions of There is only a> b relationship between a and b. Therefore, the interval L can be set freely between (w−2t) to 0 [(w−2t) to ΔL when the panel top plate protrudes ΔL from the outer peripheral rib].

  In the above embodiment, each of the four protrusions of the floor panel support leg is square, but the outer part of the protrusion is fitted to the rib intersection corner of the lattice rib of the floor panel, and the inner part of the protrusion is It is only necessary to be fitted to the right-angle corner of the outer peripheral rib of the floor panel, and even if a part is cut off as shown in FIGS. If the joint allowance and the fitting allowance of the inner portion 1102 can be sufficiently retained, the partial cutout is allowed.

  FIGS. 2-2 (a) and (b) respectively show the fitting state of the floor panel support leg to the middle of the floor panel and the cross-shaped cross connection state of the floor panel by the floor panel support leg.

  In the above embodiment, as shown in the upper right part of FIG. 1-3, the floor panel support leg protrusions 110 are placed inside the right corners 2211 at the four corners of the outer peripheral rib 221 of the floor panel 2 in the cross-shaped cross connection of the floor panel. In order to fit tightly, auxiliary grids indicated by 2210 in FIG. 1-2 are provided, but as shown in FIG. 2-3, auxiliary projections 111 are provided on the support plate 11 side of the floor panel support legs, The auxiliary ribs 111 and 111 and the inner portions 1102 of the four protrusions 110 and 110 may hold the outer peripheral rib 221 of the floor panel 2.

  In the above-described embodiment, the outer portions of the four protrusions of the floor panel support leg are fitted to the inner corners of the lattice ribs of the floor panel. However, as shown in FIG. It is also possible to adopt a shape that fits into a corner other than the inner corner 2201 at the 220 rib intersection, for example, 2201 ′.

  Fig. 3-1 (a) shows a top view of a floor panel support leg used in a double flooring, and Fig. 3-1 (b) shows a side view of the floor panel support leg. A central protrusion 1100 is provided at the center of the four protrusions 110 to 110. The cross-sectional shape of the central protrusion 1100 is preferably left / right / up / down symmetrical. For example, the cross section is preferably circular or square.

  FIGS. 3-2 (a) and (b) show the side connection state and the cross-like cross connection state of the floor panel by the floor panel support legs, and the cross-sectional shape of the central protrusion 1100 is a square shape. The width d is set to satisfy (b−d) / 2≈t, where b is the distance between the inner portions of the four protrusions 110 and t is the thickness of the ribs of the floor panel. Therefore, when connecting the floor panels, even if the auxiliary grids of the floor panels and the auxiliary projections of the floor panel support legs are omitted, the outer peripheral ribs of the floor panel are held between the central projections and the four projections to play between them. The shakiness at the time of use can be eliminated.

  FIG. 4-1 shows an example of a double flooring.

  FIG. 4A shows a grid 220 of the grid-like ribs 22 of the floor panel 2, and auxiliary ribs having a pattern that does not overlap the four protrusions 110, 110 of the support plate of the floor panel support leg shown by dotted lines. 2210 is provided on the top plate portion 210 in the lattice 220.

  If the floor panel is made of wood scrap mixed thermoplastic resin, which will be described later, and the thickness of the top panel of the floor panel is 5mm or less, the length of one side of the square rib lattice is limited to about 15 times the thickness of the top panel. With the above lattice size, there is a concern that the top plate will be stepped over. However, by providing the auxiliary rib 2210, the lattice size can be increased by 30 times or more. Therefore, it is possible to reduce the cost of manufacturing the floor panel and improve the workability by reducing the number of floor panel support legs installed.

  (B) in FIG. 4A shows the dimensional relationship between the support plate of the floor panel support leg and the rib lattice of the floor panel in the double flooring, and the height of the central protrusion 1100 of the support plate of the floor panel support leg is shown. When T2, the height of the auxiliary rib 2210 of the floor panel top plate is T3, and the height of the grid-like ribs 22 of the floor panel is T1, (T2 + T3) <T1. Accordingly, the grid-like ribs of the floor panel are supported on the support plate of the floor panel support leg, and the floor panel support area by the floor panel support leg is guaranteed and the floor panel support state can be stabilized.

  As shown in FIG. 4B, the auxiliary rib 2210 may have a shape that connects opposite vertices of the rib lattice 220. In this auxiliary rib, since the lattice-like rib 22 and the auxiliary rib 2210 form a triangle, it becomes more difficult to be deformed with respect to stress during molding or load. In this case, since the auxiliary rib 2210 and the four protrusions 110 to 110 overlap each other, the height T3 of the auxiliary rib 2210 of the floor panel top plate, the height T1 of the grid-like rib 22 of the floor panel, and the height of the protrusion 110 T20 has a relationship of (T20 + T3) <T1.

  In the double flooring, the height of the auxiliary ribs is increased so as to reach the center in the rib lattice of the floor panel.

  As the top plate in the rib lattice of the floor panel reaches the center, the bending reinforcement effect by the lattice ribs becomes smaller. Therefore, the height of the auxiliary rib increases to reach the center in the rib lattice of the floor panel. If the bending rigidity of the auxiliary rib is increased and the bending reinforcement reinforcement effect by the auxiliary rib is increased toward the portion, the overall bending strength can be improved by making the bending strength uniform. Alternatively, under the same strength, the amount of material can be reduced and the floor panel can be reduced in weight.

  In the double flooring, the lattice ribs of the floor panel are made thinner from the root to the tip. Therefore, when the ribs on the floor panel and the four protrusions on the floor panel support leg are fitted, a gap is interposed at the beginning of the mating, and the mating can be carried out strongly at the end. It is possible to obtain a reliable fixing.

  In the double flooring having the above-described configuration, the present invention is configured such that the floor panel is composed of a composite material including a thermoplastic resin made of a container and packaging recycling material obtained from recovered plastic waste and a filler made of an inorganic powder. It is a floor panel in the double flooring characterized by comprising.

  In this invention, a container packaging recycling material is a mixture which is obtained from the plastic waste collect | recovered by the local government, and has thermoplastic resins, such as polyolefin resin, as a main component. However, recycled materials mainly composed of PET resin are excluded. The collected plastic waste is subjected to steps such as separation and washing, and is granulated or pelletized, and then sent to the molding step. In the separation step, PET, polystyrene, and inorganic substances (metals) are removed as much as possible to obtain a mixture containing a polyolefin resin as a main component. This is used as a container packaging recycling material. Usually, plastic waste that is washed and ground and floats on water is used. The container packaging recycle material is composed of, for example, 30 to 70% by weight of polyethylene, 20% by weight or more of polypropylene, preferably 60% by weight or less, and 3 to 30% by weight of polystyrene. Actually, the analysis results of 10 points were 40 to 60% by weight of polyethylene, 30 to 50% by weight of polypropylene, and 5 to 20% by weight of polystyrene. When polyethylene is decreased and polystyrene is increased, the impact strength of the molded product tends to be insufficient, and when polyethylene is increased and polystyrene is decreased, mechanical strength tends to be insufficient.

  The shape of the container and packaging recycling material is not particularly limited, and a shape corresponding to the molding method is selected. When using a uniaxial melt kneader described later, the container and packaging recycle material may be a granulated product or a pulverized product of about 5 to 10 mm, which is advantageous in terms of cost and physical properties because it does not need to be heated and pelletized. It is.

  The inorganic powder used as a filler in the present invention may be an inorganic material that is generally filled in plastic, and examples thereof include fly ash, calcium carbonate, talc, and silica powder. Above all, fly ash is generated in large quantities in thermal power plants, etc., and is not sufficiently recycled, so it is inexpensive and the powder is fine spherical, so it is fluid when melted and mixed in resin. Is large, the filling amount can be increased, and it is preferably used.

  The ratio (weight) of the inorganic powder is preferably in the range of 50 to 80% in all materials.

  The filler constituting the composite material according to the present invention may contain a wood-based powder in addition to the inorganic powder.

  The unsaturated carboxylic acid-modified thermoplastic resin used as an optional additional component in the present invention may be maleic anhydride modified polypropylene (hereinafter abbreviated as MAPP), maleic anhydride modified polyethylene, or the like. In particular, MAPP is suitable for reinforcing the interface between the filler and the thermoplastic resin. MAPP can be prepared, for example, by the method described in Japanese Patent No. 3462808. When MAPP is used as an optional additive component, the appropriate amount of addition varies depending on the type of filler. When an inorganic powder such as fly ash is used as the filler, the amount of MAPP added is preferably 0.1 parts by weight or more, more preferably 0.00 parts by weight with respect to a total of 100 parts by weight of the thermoplastic resin and the inorganic powder. 3 parts by weight or more, preferably 5 parts by weight or less, more preferably 3 parts by weight or less. If the amount of MAPP added is small, the effect of improving the adhesion between the thermoplastic resin and the inorganic powder by MAPP may not be sufficiently exhibited. Moreover, even if it adds in large quantities, the remarkable improvement effect with respect to cost may not be acquired.

  Actually, the amount of MAPP used is the minimum amount necessary for interfacial reinforcement between fly ash and thermoplastic resin, and reinforcement of the polyolefin / polystyrene interface contained in the container packaging recycling material is performed using SEBS described later. Most efficient in terms of effectiveness.

  The styrene-olefin copolymer used as an optional additional component in the present invention includes styrene / ethylene / butylene / styrene copolymer (hereinafter abbreviated as SEBS), styrene / butylene / styrene copolymer (SBS), and styrene / butadiene. -Butylene styrene copolymer (SBBS) etc. are illustrated. The styrene-olefin copolymer improves the compatibility between the polyolefin resin as the main component contained in the container packaging recycling material and the polystyrene resin contained in a small amount, thereby improving the physical properties. In particular, SEBS is suitable for improving the physical properties of containers and packaging recycling materials.

  The addition amount of the styrene-olefin copolymer is preferably 0.1 parts by weight or more, more preferably 0.3 parts by weight or more, preferably 100 parts by weight or more based on the total amount of the thermoplastic resin and the filler. 5 parts by weight or less, more preferably 3 parts by weight or less. If the amount added is too small, the effect of improving the adhesion between the polyolefin resin and the polystyrene resin due to the addition of the styrene-olefin copolymer may not be sufficiently exhibited. Moreover, even if this is added in a large amount, a significant improvement effect on the cost may not be obtained.

  In the present invention, as a method for molding a composite material according to the present invention, general injection molding, extrusion molding, or the like may be used. However, since the components of the resin material and the container packaging recycling material are not uniform and not constant. A method of pressing the melt after melt-mixing the thermoplastic resin and the filler is preferable. In the injection molding that keeps the molten state for a long time with respect to the material variation, the generation of gas or the like may be a problem. On the other hand, in the extrusion molding, the surface property may be deteriorated due to a change in the melt viscosity or the like. The melt mixer is not particularly limited as long as it is an apparatus that forms a molten mixture obtained by melting a thermoplastic resin and mixing a filler. For example, a method using a general extrusion apparatus, or a rotating shaft inserted into a melt mixing chamber is provided with a plurality of stirring blades for melting thermoplastic resin by frictional heat and mixed in the preceding process. A melt mixer (for example, “K-mixing machine manufactured by Kohan Co., Ltd.”) is obtained by feeding the filler and resin into the chamber and rotating the stirring blade to obtain a molten mixture in which the filler is mixed with the molten thermoplastic resin. "(Trade name)). In the method of using a container and packaging recycle material with this melt mixer, an unspecified multi-component thermoplastic resin can be melt-mixed relatively uniformly.

  Fiber reinforced thermoplastic resin or the like is used for the floor panel support legs. These materials can be easily and reliably fitted with an appropriate hardness. Therefore, designing the outer part and the inner part of the four protrusions of the floor panel support leg with a plus side tolerance with respect to the fitting, providing the linear protrusion on the outer part and the inner part of the four protrusions of the floor panel support leg, It is possible to bite this into the ribs of the floor panel. Further, if the grid-like ribs of the floor panel are made thinner from the base to the tip as described above, the mold release is facilitated due to the draft, and distortion of the product can be prevented.

[Example of floor panel production]
The floor panel shown in FIG. 1-2 described above was produced in the following manner.

  4kg of container and packaging recycling material obtained from plastic waste collected by the local government as thermoplastic resin, 7.5kg of fly ash (made by Hokuriku Electric Power Company) as filler, and maleic acid modified polypropylene (made by Sanyo Chemical Co., Ltd.) as additive ) And a styrene-olefin copolymer (SEBS Asahi Kasei Chemicals Co., Ltd.) were added and melt kneaded using a melt kneader (“K-Mixing Machine” (trade name) manufactured by Kohan Co., Ltd.).

5.7 kg of the resulting mass melt-kneaded product was pressurized at 180 kg / cm ² while being cooled using a cooling press device, and a floor panel shown in FIG. 1-2 having a side of 500 mm was produced.

  The component analysis of the container packaging recycling material was performed by the following method.

  The container packaging recycle material used as the thermoplastic resin was melt-kneaded in the same manner as described above without including the filler, and pressed to obtain a plate molded body. From the surface reflection infrared spectrum analysis of this plate, it was confirmed that the main components were polyethylene, polypropylene and polystyrene. In addition, standard samples of polyethylene, polypropylene, and polystyrene are melted and pressed to produce standard plates, and the content of each component is calculated from the absorption spectrum intensity ratio between the plate obtained from the container packaging recycling material and the standard plate. And 50% by weight of polyethylene, 50% by weight of polypropylene, and 10% by weight of polystyrene.

  The obtained floor panel was measured for the amount of deflection when a local load of φ80 mm and 30 kg was applied at the center. After constructing the floor base using the panel and the support legs, a 12 mm thick flooring is fixed as a finishing material using a double-sided tape for flooring, and a 30 kg sand bag is dropped three times from a height of 50 cm, ○ when there was no destruction, and x when there was destruction (according to the test method of Better Living “Interior Floor Unit Impact Strength Test”). The evaluation results are shown in Table 1.

Using the obtained floor panel, using a support leg shown in FIG. 1-1 and a flooring of 12 mm thickness, in a test house (box type test room) defined in JIS A 1440, a floor structure of about 10 m ² is formed. The light floor impact sound level reduction amount and heavy floor impact sound level reduction amount were measured by the method according to the test method in the sound insulation floor finish structure certification standard of the Japanese housing performance display standard.

[Comparative example of floor panel production]
Of the 4 kg of thermoplastic resin used in the above examples, 2 kg was replaced with commercially available polypropylene to make 4 kg of thermoplastic resin. In addition, 6 kg of a wood-based material (sawdust generated at a sawmill (planar waste whitewood)) was used instead of fly ash, and no additive was used. A floor panel was produced in the same manner as in the example except for the above points.

It is drawing which shows an example of the floor panel support leg of a double flooring. It is drawing which shows an example of the floor panel of a double flooring. It is drawing which shows the fitting state to the floor panel of the support plate of the floor panel support leg of a double flooring. It is drawing which shows the example different from the above of the floor panel support leg of a double flooring. It is drawing which shows the fitting state to the floor panel of the support plate of the floor panel support leg of another example same as the above. It is drawing which shows the example different from the above of the floor panel support leg of a double flooring. It is drawing which shows the fitting state to the floor panel of the support plate of the example different from the above of the floor panel support leg of a double flooring. It is drawing which shows an example of the floor panel support leg of a double flooring. It is drawing which shows the connection state of the floor panel by the support plate of the floor panel support leg of FIGS. It is drawing which shows an example of a double flooring. It is drawing which shows an example of a double flooring. It is drawing which shows the conventional double flooring.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Floor panel support leg 11 Support plate 110 Protrusion 1101 Protrusion outer part 1102 Protrusion inner part 1100 Center protrusion 2 Floor panel 21 Top plate 22 Grid-like rib 220 Grid 2201 Right-angle corner 221 of a grid's four corners Outer rib 221x Auxiliary rib 221y Auxiliary rib 2210 Auxiliary lattice

Claims (13)

The floor panel having grid-like ribs on the back of the square top plate and the support panel are fitted to the rib grids of the floor panel, or the cross-joint of the floor panels is performed, or the floor panel side is connected The floor panel support leg support plate is provided with protrusions at positions corresponding to the four corners of the square lattice of the floor panel, with respect to the center of the four protrusions of each protrusion. Right-angle corners at the four corners of the outer peripheral ribs where the outer part is fitted to the corners of the rib intersections at the four corners and positioning is performed, and the inner parts of the projections are similarly cross-crossed on the floor panel. The distance between the outer peripheral ribs on the floor panel side to be connected is L, and the thickness of the rib is t, and the distance b between the opposed inner parts of the four protrusions is Almost In L + 2t) and has been has double flooring,
A floor in a double flooring characterized in that the floor panel is made of a composite material including a thermoplastic resin made of a container and packaging recycling material obtained from recovered plastic waste and a filler made of an inorganic powder. panel. The floor panel in a double flooring according to claim 1, wherein the inorganic powder is fly ash. The floor panel in a double flooring according to claim 1 or 2, wherein the container and packaging recycling material contains at least 20 wt% of polypropylene, 30 to 70 wt% of polyethylene, and 3 to 30 wt% of polystyrene. The floor panel in the double flooring according to any one of claims 1 to 3, wherein the composite material further contains an unsaturated carboxylic acid-modified thermoplastic resin. The floor panel in the double flooring according to claim 4, wherein the unsaturated carboxylic acid-modified thermoplastic resin is maleic anhydride-modified polypropylene. The floor panel in the double flooring according to any one of claims 1 to 5, wherein the composite material further contains a styrene-olefin copolymer. The floor panel in a double flooring according to claim 6, wherein the styrene-olefin copolymer is a styrene / ethylene / butylene / styrene copolymer. The thermoplastic resin and the filler are stirred at high speed to melt the thermoplastic resin, and both materials are mixed, and the mixture is press-molded and shaped. Manufacturing method of floor panel for double flooring. The outer shell that surrounds one protrusion is rectangular, and auxiliary ribs are provided in both the horizontal and vertical directions inside the outer peripheral rib of the floor panel with an interval of one side length c, and the outer dimensions are provided at the four corners of the outer peripheral rib. Is c
The floor panel in the double flooring material according to any one of claims 1 to 8, wherein an auxiliary lattice of xc is provided. The floor panel in the double flooring according to any one of claims 1 to 9, wherein an auxiliary projection is provided at the center of the four projections of the support plate of the floor panel support leg. An auxiliary rib in contact with the rib lattice is provided on the top plate portion in the rib lattice of the floor panel, and the height T2 of the auxiliary rib is higher than the height T1 of the lattice rib and the height T3 of the auxiliary protrusion. T2 <T1-
It is set as T3, The floor panel in the double flooring in any one of Claims 1-10 characterized by the above-mentioned. The floor panel in the double flooring according to claim 11, wherein the auxiliary ribs are provided so as to connect the apexes facing each other of the lattice. The floor panel in the double flooring according to claim 11 or 12, wherein the height of the auxiliary rib is increased to reach the center of the rib lattice of the floor panel.

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