JP2011117141A - Wash place floor for bathroom - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wash place floor for a bathroom, which enables a user to feel softness, while being equipped with surface durability for the wash place floor, and which prevents the formation of recessed traces or cracks even in the use of a chair with four legs and the like. <P>SOLUTION: In this wash place floor FP for the bathroom, a cushion layer 4 is compressed and deformed by being sandwiched between a surface layer 5 and a supporting base material layer 10 when a load is applied onto the surface layer 5, In the cushion layer 4, first and second cushion layers 4a and 4b are arranged in such a manner as to overlap each other in a vertical direction; and a separator 4c is sandwiched between the first and second cushion layers 4a and 4b. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a bathroom washroom floor.

  In bathroom washroom floors, a structure that gives cushioning to the floor surface from the viewpoint of safety has been proposed. As an example of such a structure, a bathroom washroom floor in which a foam layer and a soft material made of a thermoplastic elastomer are sequentially laminated and integrated with a base material made of a resin material such as FRP has been proposed. (For example, refer to Patent Document 1 below).

  Certainly, in the bathroom washroom floor described in the following Patent Document 1, it is possible to impart cushioning properties to the floor surface, which is considered to contribute to further enhancing safety. However, in the bathroom washroom floor described in Patent Document 1 below, because cushioning is imparted simply by increasing the softness of the floor surface, depending on the degree of softness of the foam layer and the soft material, wear There is a concern that the durability required for the floor surface may be insufficient, such as damage such as scratches or holes, and sag.

  There has been proposed a bathroom washroom floor that can make the user feel the softness of the floor surface while eliminating such concerns (for example, see Patent Document 2 below). The bathroom washroom floor described in Patent Document 2 below is a support base layer for supporting a load, a cushion layer that is laminated on the support base layer and is elastically deformable, and the cushion layer. And a surface layer having a thick part for ensuring durability and a thin part for imparting flexibility. In this bathroom washroom floor, the thick portion has such a thickness that the portion to which the load is applied is not locally deformed when a load is applied on the surface layer.

JP 2001-245814 A Japanese Patent No. 4174471

  In the bathroom washroom floor described in Patent Document 2 above, the cushion layer is laminated on the support base material layer, and the surface layer is laminated on the cushion layer, so that the surface layer has durability. By doing so, it is possible to have the durability required as a bathroom washroom floor while having softness. The surface layer is composed of a thick portion for ensuring durability and a strength, and a thin portion for imparting flexibility. In addition, when the load is applied on the surface layer, the thick part acts so that the part to which the load is applied is not locally deformed. As shown in FIG. 4 of the patent document, it is possible to obtain a soft sensation that flexes flexibly around the stepped portion and sinks only in the vicinity thereof.

  Since the bathroom washroom floor described in the above-mentioned Patent Document 2 can suppress local deformation of the surface layer while the user feels soft as described above, the user usually When bathing in the bathroom or using a bathroom chair that is usually placed in the bathroom, it is possible to give a very good feeling of use, which is the basic requirement for a bathroom washroom floor. The performance is also excellent and can be achieved sufficiently.

  However, in the bathroom, in addition to a normal bathing operation, for example, it is necessary to clean the ceiling in the bathroom or to perform maintenance of various devices provided on the ceiling. In that case, a chair or stepladder usually placed in a dining room or the like is placed on the floor of the wash floor, and the user may work on the stepladder. When a four-legged chair or the like is used in this way, a concentrated load is applied to the surface layer than in a normal use state, and the deformation angle of the surface layer near the load point becomes excessively large. It can be assumed that there will be marks or cracks. On the other hand, even when using a four-legged chair or stepladder, if the surface layer or cushion layer is stiffened, for example, it will be used normally so as not to cause concave marks or cracks. The softness of time may be lost. Although it may be possible to regulate the deformation of the surface layer by making the cushion layer thin, the cushion layer is completely crushed during normal use by the thin cushion layer, and the support base layer is bottomed out. There is a risk that the feeling of wear will be transmitted and the feeling of use will be reduced.

  The present invention has been made in view of such problems, and its purpose is a bathroom washroom floor that allows the user to feel softness while having surface durability as a washroom floor, An object of the present invention is to provide a bathroom washroom floor that does not leave a concave mark or crack even when a four-legged chair is used.

  In order to solve the above problems, a bathroom floor in accordance with the present invention includes a support base layer for supporting a load, a cushion layer laminated on the support base layer and elastically deformable, and the cushion layer. A bathroom wash floor having a durable and flexible surface layer, the cushion layer comprising a first cushion region disposed on the surface layer side, and the support A second cushion region disposed on the base material layer side, and a load distribution region disposed between the first cushion region and the second cushion region, wherein the load distribution region includes the first cushion region When transmitting a force from the cushion region to the second cushion region, the force is transmitted so that a range in which the force is transmitted is further widened.

  According to the present invention, the support base layer, the cushion layer, and the surface layer are provided, the cushion layer is laminated on the support base layer, and the surface layer is laminated on the cushion layer. The load when the user puts on or puts an object on can be supported by the support base material layer via the cushion layer. Since the cushion layer is configured to be elastically deformable, it can give a soft feel to the user who is placed on the surface layer, and the softness that is comfortable for the user by adjusting the degree of elastic deformation. Can provide. Since the surface layer is configured to have durability and flexibility, the surface layer as a bathroom washroom floor is provided with durability, and the user's load on the surface layer is transmitted to the cushion layer to bend. Can be removed.

  Further, in the present invention, a load distribution region is formed between the first cushion region on the surface layer side and the second cushion region on the support base material layer side, and the load distribution region is changed from the first cushion region to the second cushion region. When transmitting the force to the power, it is transmitted so that the range of transmitting the force is expanded. By configuring in this way, the load distribution effect of the load distribution region can be effectively exhibited. For example, when the user is placed on the surface layer, the first cushion region is mainly deformed and bottomed, The two-cushion region can be subjected to a secondary deformation and leave a part that is not completely crushed. Therefore, the user can feel that the cushion layer has a remaining margin of deformation through the surface layer. For example, even if the user depresses further, the first Even if the cushion area is completely crushed, the second cushion area is not completely crushed as much as it receives a wide range of loads. You can feel a comfortable stepping feeling without feeling the bottom.

  On the other hand, when a four-legged chair or stepladder is used, a concentrated load acts on the surface layer because the ground contact area is small even if the total weight is the same. In this case, both the first cushion region and the second cushion region are deformed, but the first cushion region is completely crushed first because the deformation ratios of the first cushion region and the second cushion region are different. This leaves room for deformation in the second cushion region. In the present invention, since the cushion layer is formed by overlapping the first cushion region and the second cushion region in the vertical direction, the thickness of the first cushion region and the thickness of the second cushion region are thinner than the entire thickness. It is comprised so that it may become. Therefore, even when the first cushion region is completely crushed, the second cushion region has a wide range due to the fact that the thickness of the first cushion region is thinner than the thickness of the cushion layer and the load distribution effect of the surface layer. Since it is not completely crushed as much as it receives the load at, the deformation angle of the surface layer in the vicinity of the load point when using a four-legged chair or stepladder can be prevented from becoming excessively large, Excessive dents in the surface layer can be prevented, and as a result, the occurrence of cracks in the surface layer can be suppressed. Furthermore, even after the first cushion region is deformed, the thickness of the second cushion region where there is room for deformation remains thinner than the thickness of the cushion layer, the deformation angle relaxation effect of the first cushion region, and the load The load dispersion effect of the dispersion region can prevent the deformation angle of the surface layer in the vicinity of the load point when using a four-legged chair or a stepladder from being excessively large, A dent can be prevented and it can suppress more effectively that a crack arises in a surface layer. Therefore, the function that can feel a soft feeling when the user is placed is maintained, and when a four-legged chair or stepladder is used, a concave mark or a crack does not occur. It is possible to provide a bathroom washroom floor that can be configured as described above.

  Moreover, in the bathroom washroom floor according to the present invention, it is also preferable that the load distribution region is formed in a flat plate shape.

  In this preferred embodiment, since the load distribution region is formed in a flat plate shape, the load distribution region can be arranged along the surface layer between the first cushion region and the second cushion region, and the force applied to the surface layer is the first. Transmission from the cushion region to the second cushion region can be performed in a wider range.

  Moreover, in the bathroom washroom floor according to the present invention, it is also preferable that the load distribution region is formed to have higher surface rigidity than the surface layer, the first cushion region, and the second cushion region.

  In this preferred embodiment, since the surface rigidity of the load distribution region is configured to be higher than that of the other portions, the external force applied in the direction penetrating the surface can be dispersed in the direction along the surface, and the surface layer can be dispersed. The applied force can be transmitted from the first cushion region to the second cushion region so as to spread more widely.

  According to the present invention, it is a bathroom washroom floor that can make the user feel soft while having surface durability as a washroom floor, and is concave even when a four-legged chair or the like is used. A bathroom washroom floor can be provided that does not leave marks or cracks.

It is a fragmentary sectional view showing a bathroom using a bathroom washroom floor according to an embodiment of the present invention. It is a perspective view which shows the bathroom washroom floor which concerns on embodiment of this invention. It is a fragmentary sectional view of the washroom floor for bathrooms concerning the embodiment of the present invention. It is a fragmentary sectional view which shows the state where the concentrated load acted on the bathroom washroom floor which concerns on embodiment of this invention. It is a fragmentary sectional view which shows the state where the non-concentrated load acted on the bathroom washroom floor which concerns on embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In order to facilitate the understanding of the description, the same components are denoted by the same reference numerals as much as possible in the drawings, and redundant descriptions are omitted.

  A bathroom using a bathroom washroom floor according to an embodiment of the present invention will be described with reference to FIG. FIG. 1 is a partial cross-sectional view showing a bathroom BR using a bathroom wash floor FP according to an embodiment of the present invention, and is a partial cross-sectional view in a wash area of the bathroom BR. As shown in FIG. 1, in the bathroom BR, a wall panel 50 is erected around the bathroom wash floor FP.

  The bathroom washroom floor FP includes a hard support base layer 10, a cushion layer 4 having cushioning properties laminated on the support base material layer 10, and a surface layer 5 laminated on the cushion layer 4. I have.

  The supporting base material layer 10 is waterproof so that hot water does not leak outside the bathroom, and is greatly bent or damaged even when subjected to static loads such as wall panels 50, ceiling panels, bath chairs, and basins, and dynamic loads of users. It is formed from a hard material having sufficient strength. For example, it is made of a thermosetting resin such as FRP (Fiber Reinforced Plastic) or a thermoplastic resin such as polypropylene or polyethylene reinforced.

  The support base material layer 10 is provided with a recess 2 formed in a concave shape in a longitudinal sectional view. The concave portion 2 occupies most of the area of the supporting base material layer 10 in a top view, and an edge portion 6 that is one step higher than the upper surface (bottom surface) of the concave portion 2 is provided on the outer side of the concave portion 2. A side wall 8 that functions as a water return wall rising upward is provided on the outermost edge of the support base material layer 10 on the outer side of the edge 6.

  The support base material layer 10 is integrally formed by hot-molding a hard material, so that the recess 2, the edge 6 and the side wall 8 are integrally formed.

  The cushion layer 4 is entirely accommodated in the concave portion 2 of the support base material layer 10 and bonded and fixed to the upper surface (bottom surface) of the concave portion 2 with an adhesive such as a double-sided tape. The cushion layer 4 is elastically deformable and is made of a foamed material such as urethane. The cushion layer 4 may be an elastically deformable rubber material, but a foam without a rubber odor is preferable for use as a bathroom floor in a bathroom with high airtightness. In the present embodiment, the cushion layer 4 is functionally composed of at least two regions, and details thereof will be described later.

  The surface layer 5 is made of a relatively hard and tough material so as to satisfy the basic performance (durability) required for the washing floor surface, such as water resistance, chemical resistance, abrasion resistance, and impact resistance. . Examples of the material for the surface layer 5 include FRP, PVC (vinyl chloride), polypropylene, polyethylene, urethane resin, polyester resin, styrene / polyester / olefin / acrylic elastomers, rubber such as EVA, EPDM, and silicone rubber. Examples thereof include (hard) systems, those prepared by adjusting the hardness to such an extent that sufficient durability can be expected, or composite materials obtained by adding fillers and reinforcing materials to these as bases. These materials are examples, and other materials for the surface layer 5 may be materials that have a certain degree of flexibility and are tough enough to have sufficient durability for general use in bathrooms. , Not limited to those described above. In particular, it is possible to provide a highly reliable product by using, for the surface layer 5, FRP that has a proven track record in exhibiting the basic performance required for washroom flooring.

  The detailed structure of the surface layer 5 will be described with reference to FIG. FIG. 2 is a perspective view of the bathroom washing floor FP. As shown in FIG. 3, the surface layer 5 includes a thick portion 5 a for ensuring the surface strength of the washing floor, and a thin wall for providing the surface layer 5 with flexibility capable of following the deformation of the cushion layer 4. Part 5b. By forming the groove 12 cut from the surface side exposed in the bathroom in the surface layer 5, the thick part 5a and the thin part 5b are formed. The groove 12 does not reach the lower cushion layer 4, and the groove 12 does not completely divide the surface layer 5.

  The thin part 5b is located below the groove 12, and the thickness of the thin part 5b is thinner than the thickness of the thick part 5a. The groove 12 and the thin portion 5b located below the groove 12 are formed in a lattice shape over the entire surface layer 5, and the thick portion 5a is formed in an island shape surrounded by the groove 12 and the thin portion 5b. .

The width of the thin portion 5b when the groove 12 is viewed in the concave cross-sectional view is smaller than the width of the thick portion 5a in the same cross-sectional view. The planar area of the thick part 5a in the entire surface layer 5 is larger than the planar area of the thin part 5b.

  Referring to FIG. 1 again, the surface layer 5 is laminated on the cushion layer 4 so as to cover the upper surface of the cushion layer 4 and the recess 2. The planar size of the surface layer 5 is larger than the planar size of the cushion layer 4 (longer in both length and width), and the peripheral portion protruding from the cushion layer 4 in the surface layer 5 does not go through the cushion layer 4 but the supporting base material layer. It is laminated on the upper surface of 10 edge portions 6. The back surface of the surface layer 5 opposite to the surface on which the groove 12 is formed is bonded and fixed to the upper surface of the cushion layer 4 and the upper surface of the edge portion 6 of the support base layer 10 with an adhesive such as double-sided tape. .

  The surface layer 5 is thinner than the cushion layer 4. The planar size of the surface layer 5 is smaller than the planar size of the entire support base material layer 10 (formed in a short length and width) and larger than the planar size of the recess 2 (formed in a long length and width).

  In obtaining the laminated structure of the support base layer 10, the cushion layer 4 and the surface layer 5, they may be welded and fixed to each other by hot molding integrally (insert and laminate molding), or the support base material. After the molding process of the layer 10, the cushion layer 4 is attached to the upper surface (bottom surface) of the recess 2 using an adhesive such as a double-sided tape, and further the adhesive such as a double-sided tape is applied to the surface of the cushion layer 4. The surface layer 5 may be attached using

  The peripheral portion of the surface layer 5 disposed on the outer side of the concave portion 2 of the support base material layer 10 is watertightly sealed with a sealing material 11 such as silicon or a joint member, for example, and the surface layer 5 and the support base material layer 10 are sealed. Intrusion of water between the two is prevented.

  A wall panel 50 is placed on the upper surface of the edge portion 6 of the support base material layer 10 on the outer side from the peripheral edge portion of the surface layer 5. The sealing material 11 performs watertight sealing between the peripheral edge of the surface layer 5 and the support base material layer 10 and between the wall panel 50 and the support base material layer 10.

  As described above, in the structure in which the surface layer 5 is laminated on the surface side of the cushion layer 4, the user touches the surface layer 5, but the user feels the function (softness) of the cushion layer 4. Therefore, the surface layer 5 is required to be flexible enough to follow the deformation of the cushion layer 4.

  In the present embodiment, even if the hard surface layer 5 has durability, the thickness of the surface layer 5 is not uniform in the surface direction, and the structure has the thick portion 5a and the thin portion 5b. The surface layer 5 can be flexed flexibly following the deformation of 4 and the softness of the cushion layer 4 can be transmitted to the user.

  Next, a detailed configuration of the cushion layer 4 will be described with reference to FIG. FIG. 3 is a partial cross-sectional view of the bathroom wash floor FP. As shown in FIG. 3, the cushion layer 4 is configured by laminating the first cushion layer 4a (first cushion region) and the second cushion layer 4b (second cushion region) so as to overlap in the vertical direction. ing. Further, a separator 4c (load distribution region) is provided between the first cushion layer 4a and the second cushion layer 4b.

  The second cushion layer 4b is compressed and deformed by being sandwiched between the support base material layer 10 when a load is applied on the surface layer 5, and the amount of contraction with respect to the reference load at the time of the compressive deformation is the first amount. It is a layer. In the case of the present embodiment, the reference load is calculated based on the body weight assumed as the user, and when the user is placed on the surface layer 5, the second cushion layer 4b is deformed to be substantially crushed, The first amount, which is the amount of shrinkage, is set to be substantially the same as the thickness of the second cushion layer 4b.

  The first cushion layer 4a is sandwiched between the support base material layer 10 when a load is applied on the surface layer 5 and is compressed and deformed, and the amount of contraction with respect to the reference load at the time of the compressive deformation is the second amount. It is a layer. In the case of this embodiment, the second amount is set to be equal to the first amount described above. In the case of the present embodiment, the first amount and the second amount are set to be equal, but the second amount may be set to be smaller than the first amount. The amount may be set to be larger than the first amount. In any case, when a load is applied to the surface layer 5, the first cushion layer 4a is crushed first, the force applied to the first cushion layer 4a is diffused by the separator 4c, and the second cushion layer 4b is compressed at the same time. Although it is deformed, it is preferable that the deformation ratio is set to be different from that of the first cushion layer 4a (the room for deformation remains).

  The separator 4c is made of a material that is harder and less deformable than the first cushion layer 4a and the second cushion layer 4b, and preferably an iron plate or the like is used. When the force is transmitted from the first cushion layer 4a to the second cushion layer 4b, the separator 4c serving as the load distribution region transmits the force so that the range in which the force is transmitted is further expanded. Accordingly, not only the surface layer 5 but also the separator 4c can exert a load dispersion effect, and the deformation angle of the surface layer 5 in the vicinity of the load point when using a four-legged chair or stepladder is not excessively increased. Therefore, excessive local dents in the surface layer 5 can be prevented, and as a result, generation of cracks in the surface layer can be suppressed.

  When the cushion layer 4 is configured in this way, an example in which a four-legged chair is placed on the surface layer 5 and a concentrated load is applied is shown in FIG. 4, and the user is placed on the surface layer 5 and is not concentrated. An example in which a load is applied is shown in FIG.

  The bathroom washing floor FP in the present embodiment includes a support base layer 10, a cushion layer 4, and a surface layer 5, and the cushion layer 4 is laminated on the support base layer 10 and the surface on the cushion layer 4 Since the layer 5 is laminated, a load when a user places an object or an object on the surface layer 5 can be supported by the support base material layer 10 via the cushion layer 4. Since the cushion layer 4 is configured to be elastically deformable, a soft feeling can be given to the user who is placed on the surface layer 5, and for the user by adjusting the degree of elastic deformation. Comfortable softness can be provided. Since the surface layer 5 is configured to have durability and flexibility, the load of the user who is placed on the surface layer 5 is transmitted to the cushion layer while having surface durability as a bathroom washroom floor. Can be bent.

  In the present embodiment, when a load is applied to the surface layer 5, the groove 12 (see FIG. 2) and the thin portion 5b below (see FIG. 2) bend into a concave cross section. For this reason, even if it is the hard surface layer 5, the surface layer 5 does not continue to bend and suppresses bending, flexing around the stepped area, and feeling soft as if only its vicinity sinks. Obtainable.

  The thin portions 5b (see FIG. 2) that play a role of imparting flexible flexibility to the surface layer 5 are formed in a lattice shape over the entire surface of the surface layer 5, that is, on the surface of the surface layer 5. The thin portions 5b that are the nodes of deformation are vertically and horizontally distributed without being unevenly distributed, and no matter where the load is applied on the floor surface, the directivity is not generated in the direction of deformation, and the stepped portion is completely on the surface. It can be recessed azimuthally.

  Furthermore, in this embodiment, the separator 4c which is a load distribution area | region is arrange | positioned between the 1st cushion layer 4a by the side of the surface layer 5, and the 2nd cushion layer 4b by the side of the support base material layer 10, and as the load distribution area | region When the separator 4c transmits force from the first cushion layer 4a to the second cushion layer 4b, the separator 4c transmits the force so that the range in which the force is transmitted is further expanded. With this configuration, the load distribution effect of the separator 4c can be effectively exhibited. As shown in FIG. 5, when the user's foot 22 is placed on the surface layer 5, the first cushion layer 4a. However, the second cushion layer 4b can be deformed accordingly and leave a part that is not completely crushed. Therefore, the user can feel that the cushion layer 4 has a remaining deformation (second cushion layer 4b) through the surface layer 5, for example, the user has stepped in with more force. Even in this case, by deforming the remaining second cushion layer 4b, it is possible to make the user feel a comfortable stepping feeling without making the user feel a complete bottom.

  On the other hand, when a four-legged chair is used as shown in FIG. 4, a concentrated load acts on the surface layer 5 because the ground contact area of the chair leg 20 is small even if the total weight is the same. In this case, the first cushion layer 4a is immediately deformed, and the second cushion layer 4b is deformed after the first cushion layer 4a is completely crushed. In this embodiment, since the cushion layer 4 is formed by overlapping the first cushion layer 4a and the second cushion layer 4b in the vertical direction, the thickness of the first cushion layer 4a is also greater than the total thickness. The thickness of the layer 4b is also reduced. Therefore, even if the first cushion layer 4a is completely crushed, the chair cushion is caused by the fact that the thickness of the first cushion layer 4a is smaller than the thickness of the cushion layer 4 and the load distribution effect of the surface layer 5. The deformation angle of the surface layer 5 in the vicinity of the load point of 20 can be prevented from becoming excessively large, the excessive dent of the surface layer 5 can be prevented, and the occurrence of cracks in the surface layer 5 is suppressed as a result. it can.

  Furthermore, the thickness of the second cushion layer 4b, which is deformed after the first cushion layer 4a is deformed, is also thinner than the thickness of the cushion layer 4, and the effect of reducing the deformation angle of the first cushion layer 4a and the separator 4c, thereby the chair leg 20 The deformation angle of the surface layer 5 in the vicinity of the load point can be prevented from becoming excessively large, excessive local dents in the surface layer 5 can be prevented, and cracks in the surface layer 5 can be prevented. It can be effectively suppressed. Therefore, when a user puts on, a function that can feel a soft feeling of use is maintained, and when a four-legged chair or stepladder is used, a concave mark or a crack does not occur. It is possible to provide a bathroom washroom floor that can be configured as described above.

  Furthermore, in this embodiment, since the load distribution area | region is formed with the flat separator 4c, it can arrange | position along the surface layer 5 between the 1st cushion layer 4a and the 2nd cushion layer 4b, The force applied to the layer 5 can be transmitted from the first cushion layer 4a to the second cushion layer 4b so as to spread more widely.

  Furthermore, in the present embodiment, an iron plate is used as the separator 4c so that the surface rigidity is higher than that of other portions. Therefore, the external force applied in the direction penetrating the surface can be dispersed in the direction along the surface. The force applied to the surface layer 5 can be transmitted from the first cushion layer 4a to the second cushion layer 4b so as to spread more widely.

2: Concave part 4: Cushion layer 4a: First cushion layer 4b: Second cushion layer 4c: Separator 5: Surface layer 5a: Thick part 5b: Thin part 5c: Thin part 6: Edge part 8: Side wall part 10: Support Base material layer 11: Sealing material 12: Groove 50: Wall panel BR: Bathroom FP: Bathroom wash floor 20: Chair leg 22: Feet

Claims (3)

A supporting base material layer for supporting a load;
A cushion layer laminated on the support base layer and elastically deformable;
A bathroom washroom floor comprising a durable and flexible surface layer laminated on the cushion layer;
The cushion layer is sandwiched between a first cushion region disposed on the surface layer side, a second cushion region disposed on the support base material layer side, the first cushion region, and the second cushion region. And a load distribution area arranged
The load dispersal area transmits a force so that a range in which the force is transmitted is more widened when the force is transmitted from the first cushion area to the second cushion area.   The bathroom washroom floor according to claim 1, wherein the load distribution region is formed in a flat plate shape.   3. The bathroom according to claim 1, wherein the load distribution region is formed to have higher surface rigidity than the surface layer, the first cushion region, and the second cushion region. Washing floor.

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