JP2018031182A - Floor material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a floor material that hardly curls (warps).SOLUTION: A vinyl-based floor material comprises a base material, a foaming resin layer and a surface resin layer in that order. An expansion ratio of the foaming resin layer is 3 to 10 times. At least either of the foaming resin layer and the surface resin layer is a layer formed using a polyvinyl chloride resin, and has irregularities formed by a plurality of cells on a surface opposite of the base material. A length (L) in an MD direction of the cell is between 0.1 and 50 mm, and a length (L) in a TD direction of the cell is between 0.1 and 50 mm. Furthermore, a ratio (L/L) of the length (L) in the MD direction to the length (L) in the TD direction of the cell is between 0.25 and 4.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a vinyl flooring.

  Examples of the flooring material include household flooring materials such as carpets, wood flooring materials, vinyl flooring materials, and the like, which are selected according to applications and purposes. Among them, vinyl floor materials such as cushion floors are widely used because they are easy to care for and have excellent workability in addition to performances such as heat retention, water resistance and moisture resistance.

  Vinyl-based flooring materials generally have a foamed resin layer and a surface layer on a base material, and the base material is made of woven fabric, non-woven fabric, mixed paper, etc., in which a synthetic resin is impregnated and cured. Vinyl chloride resin is mainly used for the foamed resin layer and the surface layer (for example, Patent Document 1).

JP 2011-046048 A

When such a vinyl-based flooring is used, woven fabrics, nonwoven fabrics, mixed papers, and the like used as substrates tend to absorb and absorb moisture in the atmosphere, while the foamed resin layer and the surface layer have a temperature. It expands and contracts with changes. Therefore, stress is generated between the base material, the surface resin layer, and the surface layer, and a problem of curling (warping) occurs. In particular, in an environment where the temperature is low, the surface resin layer and the surface layer tend to shrink, so curling of the vinyl-based flooring toward the foamed resin layer and the surface layer side becomes significant. Further, in recent years, so-called laying is often performed by installing on the floor without applying an adhesive or adhesive on the back surface of the vinyl-based flooring, and the flooring is easily curled. There is a tendency.
When curling occurs at the end due to changes over time due to the use of vinyl-based flooring, there is a case where the curling causes a hit by hitting the foot during walking, causing injury due to falling, and curling suppression is urgent.

  An object of the present invention is to provide a flooring in which the occurrence of curling (warping) is suppressed under such circumstances.

  As a result of intensive studies to solve the above-mentioned problems, the present inventors have found that the problem can be solved by the following invention. That is, this invention provides the flooring which has the following structure.

1. A vinyl-based flooring having a base material, a foamed resin layer, and a surface resin layer in order, wherein the foaming resin layer has a foaming ratio of 3 to 10 times, and at least one of the foamed resin layer and the surface resin layer is chlorinated. It is a layer formed using a vinyl resin, and has unevenness due to a plurality of cells on the surface of the surface resin layer opposite to the base, and the length of the cell in the MD direction (L _M0 ) is 0.1. The length in the TD direction (L _T0 ) of the cell is 0.1 to 50 mm, and the length in the MD direction (L _M0 ) with respect to the length in the TD direction (L _T0 ) of the cell vinyl flooring ratio of _(L M0 _/ L _T0) is 0.25-4.
2. 2. The vinyl flooring according to 1 above, wherein the base material contains a glass material.
3. The above 1 wherein the surface resin layer is a layer comprising a resin composition containing a vinyl chloride resin and a plasticizer, wherein the plasticizer content is 40 to 80 parts by mass with respect to 100 parts by mass of the vinyl chloride resin. Or the vinyl-type flooring of 2.
4). 4. The vinyl flooring according to 3 above, wherein the plasticizer is a cold resistant plasticizer.
5). 5. The vinyl flooring according to any one of 1 to 4, wherein the foamed resin layer has a thickness of 2 to 4 mm.
6). The vinyl flooring according to any one of 1 to 5 above, wherein the thickness is 2.5 to 4.5 mm.

  ADVANTAGE OF THE INVENTION According to this invention, generation | occurrence | production of the curl (warp) can be suppressed and the vinyl-type flooring excellent in curl resistance can be provided.

It is a schematic diagram which shows the aspect of the cell of the vinyl-type flooring of this invention. It is a schematic diagram for demonstrating the length of MD direction and the length of TD direction of the cell of the vinyl-type flooring of this invention. It is the photographic image which image | photographed the surface of the flooring obtained in the Example. It is the microscope picture image of the surface of the flooring obtained in the Example, and a cross section. It is the photographic image which image | photographed the surface of the flooring obtained by the comparative example.

  Hereinafter, an embodiment of the present invention (hereinafter also referred to as “the present embodiment”) will be described. In this specification, MD direction means the width direction of a flooring, and TD direction means the length direction of a flooring. Moreover, the upper limit and the lower limit of the numerical ranges described in this specification can be arbitrarily combined.

The vinyl-type flooring of this embodiment is a vinyl-type flooring which has a base material, a foamed resin layer, and a surface resin layer in order, The foaming resin layer has a foaming ratio of 3 to 10, and the foamed resin. At least one of the layer and the surface resin layer is a layer made of a vinyl chloride resin, and the surface resin layer has irregularities due to a plurality of cells on the surface opposite to the base material, The length (L _M0 ) is 0.1 to 50 mm, the length of the cell in the TD direction (L _T0 ) is 0.1 to 50 mm, and the length of the cell in the TD direction (L _T0 ) It is a flooring whose ratio (L _M0 / L _T0 ) of the length (L _M0 ) in the MD direction to 0.25 is 0.25-4.

(Base material)
The base material improves the adhesion between the vinyl-based flooring and the base, and functions as a support when forming the foamed resin layer and the surface layer, and is used as a base material for the flooring. Can be used without limitation.
As a base material, in addition to a paper base material such as pulp paper, a glass material, an inorganic material such as a mineral, a base material containing a synthetic resin material, for example, an inorganic fiber such as a glass fiber and a mineral fiber, or a synthetic resin fiber was used. Examples thereof include woven fabrics, non-woven fabrics, mixed papers obtained by mixing these fibers and resin binders, and composite base materials combining these. More specifically, examples of such a substrate include glass fiber nonwoven fabric, rock wool paper, and glass mixed paper. From the viewpoints of improving adhesion to the base and the foamed resin layer, dimensional stability, etc., a substrate containing a glass material is preferable, and a non-woven fabric using glass fiber, a glass mixed paper mixed with glass fiber and a resin binder, etc. More preferred.

  Although there is no restriction | limiting in particular in the thickness of a base material, From viewpoints, such as an adhesive improvement with a resin layer, and dimensional stability, 100-500 micrometers is preferable, 150-450 micrometers is more preferable, 200-350 micrometers is still more preferable.

(Foamed resin layer)
The foamed resin layer is a layer that requires a foaming ratio of 3 to 10 times. By setting such a foaming ratio, the vinyl flooring of the present embodiment has cushioning properties, and a pedestrian has an impact during walking. Can absorb the impact.
The foamed resin layer can be obtained by using a resin composition for forming a foamed resin layer, which contains a resin capable of forming the foamed layer, a foaming agent, and, if necessary, a foaming stabilizer. Examples of the resin that can form the foamed layer include thermoplastic resins such as vinyl chloride resin, polyolefin resin, acrylic resin, and urethane resin. From the viewpoint of obtaining better cushioning and shock absorbing properties, vinyl chloride resin is used. Is preferably used. The foamed resin layer is more preferably a layer formed by foaming a resin composition for forming a foamed resin layer containing, for example, polyvinyl chloride plastisol or the like and containing a vinyl chloride resin having a degree of polymerization of 800 to 3000.

As the foaming agent, a thermally decomposable organic foaming agent is preferable. Hydrazine derivatives and the like.
0.3-10 mass parts is preferable with respect to 100 mass parts of resin, and, as for the usage-amount of a foaming agent, 0.5-5 mass parts is more preferable. When the amount of the foaming agent used is within the above range, excellent foamability can be obtained, and fine and good bubbles can be easily obtained without bursting the bubbles.

As the foam stabilizer, a composite stabilizer containing at least one of lead, barium, zinc, calcium and tin as a metal species, preferably at least one of zinc, barium and calcium, more preferably a composite stabilizer containing barium and zinc. Preferable examples include organic acid compounds such as stearates containing these metal species.
0.3-10 mass parts is preferable with respect to 100 mass parts of resin, and, as for the usage-amount of a foaming stabilizer, 0.5-5 mass parts is more preferable. When the amount of the foam stabilizer used is within the above range, excellent foamability can be obtained, and fine and good bubbles can be easily obtained without bursting the bubbles. In the present embodiment, the foam stabilizer may not be used in consideration of environmental problems.

  The foaming ratio of the foamed resin layer is preferably 3 to 8 times, more preferably 3 to 6 times, still more preferably 4 to 5 times, in consideration of curl resistance, further cushioning properties and shock absorption. 1 to 5 times is particularly preferable. The expansion ratio can be adjusted mainly depending on the type of resin that can form the foamed layer, the type of foaming agent, and the amount used, and can be adjusted according to the desired expansion ratio.

  Although there is no restriction | limiting in particular in the thickness of a foamed resin layer, 2-4 mm is preferable, 2-3.5 mm is more preferable, 2.5-3 mm is still more preferable. When the thickness of the foamed resin layer is within the above range, more excellent curling resistance, further cushioning properties and impact absorption properties can be obtained.

(Surface resin layer)
A surface resin layer is a layer located in the outermost surface of the flooring material of this embodiment, and is a layer directly visible to a pedestrian and a layer that can be stepped on directly when the flooring material is in use.
The surface resin layer needs to have irregularities on the surface opposite to the substrate. By having the unevenness, the excellent curling resistance of the flooring material of this embodiment can be obtained, and high design properties can be obtained at the same time. There is no particular limitation on the method for providing the unevenness, and it can be provided by embossing, and the unevenness pattern can be appropriately selected according to the desired design. For example, when providing a printed layer, the pattern of the printed layer It can be made a pattern according to.

  The surface protective layer has irregularities due to a plurality of cells on the surface opposite to the substrate, that is, on the outermost surface side of the flooring. Here, the cell means a region surrounded by the recesses, specifically, a substantially square region shown in FIG. 1-1, FIG. 1-2, FIG. 1-3, and These are the substantially triangular, substantially square, substantially rectangular, substantially parallelogram, substantially trapezoidal, substantially circular, and substantially elliptical regions shown in FIG. (1-4), and are surrounded by the recesses of these regions. By the presence of a plurality of cells on the surface of the surface protective layer, a concave portion and a region surrounded by the concave portion are formed, and as a result, the surface protective layer has irregularities on the surface.

  In the present embodiment, the cells may be regularly arranged in the same shape as shown in FIGS. (1-1) and (1-3), or may be different as shown in FIG. (1-2). May be arranged regularly, or may be arranged in combination with different shapes as shown in Fig. (1-4), or as shown in Fig. (1-5). Some of the cells may be omitted and arranged. In addition, although the part from which the one part cell shown by figure (1-5) was missing can also be said to be the area | region enclosed by the recessed part, such a part is not called a cell in this embodiment. Similarly, a portion surrounded by a substantially circular cell or a substantially elliptical cell shown in FIG. (1-4) is not called a cell. That is, it can be said that the cell in the present embodiment has a shape intentionally surrounded by the recess.

In the present embodiment, the length of the cell in the MD direction (L _M0 ) is 0.1 to 50 mm, and the length of the cell in the TD direction (L _T0 ) is required to be 0.1 to 50 mm. When the length of the cell in the MD direction (L _M0 ) and the length of the cell in the TD direction (L _T0 ) are within the above ranges, excellent curl resistance can be obtained.
The length of the cell in the MD direction (L _M0 ) and the length of the cell in the TD direction (L _T0 ) are not particularly limited as long as they are within the above ranges, and can be appropriately selected according to desired design properties. For example, from the viewpoint of obtaining better curl resistance, the length of the cell in the MD direction (L _M0 ) is preferably 0.3 to 30 mm, more preferably 0.5 to 20 mm, and still more preferably 1 to 15 mm. 3 to 12 mm is particularly preferable. From the same viewpoint, the length of the cell in the TD direction (L _T0 ) is preferably 0.3 to 30 mm, more preferably 0.5 to 20 mm, still more preferably 1 to 15 mm, and particularly preferably 3 to 12 mm. . For example, when a pattern composed of relatively fine cells such as a grain pattern is adopted, the length of the cell in the MD direction (L _M0 ) and the length of the cell in the TD direction (L _T0 ) are preferably Is 0.1 to 1 mm, more preferably 0.1 to 0.8 mm, and still more preferably 0.1 to 0.5 mm.
Further, from the viewpoint of improving the curl resistance, the length of the cell in the MD direction (L _M0 ) is preferably longer than the length of the cell in the TD direction (L _T0 ). Since the TD direction tends to cause curling, the curl resistance can be improved by providing a larger number of cells in the TD direction.

In the present embodiment, the ratio of the length (L _M0 ) in the MD direction to the length (L _T0 ) in the TD direction of the cell (L _M0 / L _T0 ) needs to be 0.25-4. When the length of the cell in the MD direction and the TD direction satisfies the above mathematical formula, the floor material of the present embodiment has excellent curl resistance. From the same viewpoint, the ratio L _M0 / L _T0 is preferably 0.3 to 3, preferably 0.5 to 2, and more preferably 0.5 to 1.5.

The length of the cell in the MD direction (L _M0 ) and the length in the TD direction (L _T0 ) are, for example, substantially square, and when each side is along the MD direction and the TD direction, FIG. The same can be determined for a substantially rectangular shape. Moreover, when it is substantially square or substantially rectangular, and each side does not follow MD direction and TD direction (FIG. (2-2)), when it is shapes other than a substantially square and a substantially rectangular shape, for example, figure (2- 2) to (2-4), the length in the MD direction and the length in the TD direction when the smallest circumscribing quadrangle is used are the length in the MD direction of the cell ( _LM0 ) and TD, respectively. The length in the direction (L _T0 ).

  In the present embodiment, from the viewpoint of obtaining better curling resistance, the area ratio of the above cells to the entire flooring is preferably as large as possible, preferably 60% or more, more preferably 80% or more, and 90% or more. Further preferred. The upper limit is less than 100% considering the area occupied by the recesses.

Moreover, in this embodiment, you may have cells other than said cell in the range which does not impair curl resistance. The ratio of the above cells that express the curl resistance in all the cells of the flooring material, that is, the cells having the length in the MD direction (L _M0 ) and the length in the TD direction (L _T0 ), From the viewpoint of curling resistance, it is preferably as large as possible. Specifically, it is preferably 80% or more, more preferably 90% or more, still more preferably 95% or more, and particularly preferably 100%.

There are no particular limitations on the dimensions of the concave and convex recesses, as long as the length in the MD direction (L _M0 ) and the length in the TD direction (L _T0 ) of the cell satisfy the above conditions. However, the depth of the concave portion is preferably 30 to 700 μm from the viewpoint of obtaining cushioning properties, shock absorption, and design properties as well as excellent curling resistance. 50 to 650 μm is more preferable, and 100 to 600 μm is still more preferable. The concave and convex portions of the surface resin layer may extend to the foamed resin layer and the base material in the thickness direction, not limited to the surface resin layer.
The width of the concave and convex portions is preferably 1 to 1000 μm, more preferably 3 to 700 μm, and more preferably 5 to 500 μm.

  As the resin used for the surface resin layer, the surface resin layer is a layer that is directly stepped on by pedestrians, and preferably has wear resistance as well as excellent cushioning and shock absorption properties. A vinyl chloride resin, particularly a vinyl chloride resin having a polymerization degree of 800 to 3000 is preferred.

  In the present embodiment, it is necessary that at least one of the foamed resin layer and the surface resin layer is a layer using a vinyl chloride resin. As a result, the flooring of the present embodiment has excellent curl resistance, cushioning properties and shock absorption, and can be obtained more easily and inexpensively. From the same viewpoint, the foamed resin layer and the surface resin layer are preferably layers using a vinyl chloride resin.

Moreover, it is preferable that the surface resin layer contains the plasticizer especially from a viewpoint of cushioning properties and impact absorption. That is, the surface resin layer is a layer made of the above resin, preferably a vinyl chloride resin, a plasticizer, and a resin composition for forming a surface resin layer containing various additives used as necessary. Is preferred.
The plasticizer is not particularly limited, but a cold resistant plasticizer is preferable. By using a cold-resistant plasticizer, even when used in any environment such as an environment where the temperature is low, superior curl resistance, cushioning properties and shock absorption properties can be obtained.

  Examples of cold resistant plasticizers include phosphate ester plasticizers such as tricresyl phosphate, basic acid ester plasticizers, and the like. Examples of basic acid ester plasticizers include saturated monobasic acids such as acetic acid, butyric acid, caproic acid, caprylic acid, lauric acid, myristic acid and stearic acid; unsaturated monobasic acids such as oleic acid, linoleic acid and linolenic acid; Bases such as dibasic acids such as oxalic acid, maleic acid, succinic acid, adipic acid, azelaic acid, sebacic acid, tartaric acid, phthalic acid, phthalic anhydride, terephthalic acid; tribasic acids such as trimellitic acid and citric acid An ester of an acid can be mentioned, among which an ester of a dibasic acid is preferable, an ester of an aliphatic dibasic acid having 6 to 10 carbon atoms is more preferable, an ester of phthalic acid, adipic acid, azelaic acid, or sebacic acid is more preferable, An ester of adipic acid is particularly preferred.

  More specifically, such cold-resistant plasticizers include dioctyl phthalate, diisobutyl phthalate, dioctyl tetrahydrophthalate, phthalic acid such as polyester of phthalic acid and propylene glycol, butanediol, hexadiol, and the like. Ester plasticizers: Dioctyl adipate, diisodecyl adipate, adipic acid plasticizers such as polyesters of adipic acid and glycols such as propylene glycol, butanediol, hexadiol; other dioctyl azelate, dibutyl sebacate Can be mentioned.

  In this embodiment, the amount of the plasticizer used is preferably 40 to 80 parts by mass, more preferably 45 to 75 parts by mass, still more preferably 50 to 70 parts by mass, and particularly preferably 60 to 70 parts by mass with respect to 100 parts by mass of the resin. Part by mass is particularly preferred. When the amount of the plasticizer used is within the above range, more excellent curling resistance, cushioning properties and shock absorption properties can be obtained, and bleeding does not occur.

When a design layer is provided as desired between the surface resin layer and the foamed resin layer, the surface resin layer is preferably transparent from the viewpoint of not hindering the design exposed by the design layer. In the present embodiment, “transparent” has a concept including not only colorless and transparent but also colored and transparent (translucent) colored to such an extent that the design of the design layer can be visually recognized.
When the surface resin layer is transparent, it is preferable to use a stabilizer for transparency. The stabilizer for transparency is not particularly limited and is a composite stabilizer containing at least one of lead, barium, zinc, calcium, tin and the like as a metal species, preferably at least one of zinc, barium, and calcium, more preferably barium. Preferred examples include composite stabilizers containing zinc and zinc, for example, organic acid compounds such as stearates containing these metal species.
0.3-10 mass parts is preferable with respect to 100 mass parts of resin, and, as for the usage-amount of the stabilizer for transparency, 0.5-5 mass parts is more preferable. When the use amount of the stabilizer for transparency is within the above range, good transparency can be obtained and a more excellent design can be obtained.

  Moreover, in order to reinforce a function required as a flooring material in the surface resin layer, various additives, reinforcing materials, fillers and the like as required, more specifically, for example, an ultraviolet absorber, an antioxidant, Antistatic agents, flame retardants, lubricants, inorganic fillers, and the like can be used.

  The thickness of the surface resin layer is not particularly limited, but is preferably 50 to 500 μm, more preferably 100 to 300 μm, and still more preferably 120 to 200 μm. When the thickness of the surface resin layer is within the above range, more excellent curling resistance, further wear resistance, cushioning properties and shock absorption can be obtained.

(Print layer)
The printed layer is a layer that imparts designability to the flooring of the present embodiment, and is a layer that is provided as desired. The print layer may be a solid print that is substantially uniformly colored on the entire surface in order to conceal the underlying foam resin layer, the base material, and further the ground color of the base, or may be a wood grain pattern, marble pattern, etc. Marquetry pattern that mimics the surface of rock, grain pattern that mimics the texture of granular sand, fabric pattern that mimics cloth or cloth-like pattern, tiled pattern, brickwork pattern, etc. A pattern such as a work may be presented, or a combination of solid printing and a pattern may be used. The printing layer is preferably provided between the foamed resin layer and the surface resin layer from the viewpoint of concealing the lower layer of the foamed resin layer, the base material, and further the ground color of the base.

  These patterns are formed by gravure printing with normal yellow, red, blue, and black process colors, and also by gravure printing with special colors prepared by preparing individual color plates constituting the pattern. . In addition, the ink composition forming the printing layer contains at least a colorant such as a binder resin, a pigment and a dye, and optionally contains extender pigments, solvents, stabilizers, plasticizers, catalysts, curing agents, and the like. can do.

  In this embodiment, when providing a printing layer, the pattern of a printing layer and the pattern by an unevenness | corrugation may synchronize, and you may dare different. Examples of the tuning include a case in which the printed layer is a stone pattern and the unevenness is a pattern in which substantially square cells are continuous.For example, the printed layer is a woodgrain pattern and the unevenness is approximately For example, a case in which a rectangular cell has a continuous pattern. The above-mentioned “different” has not been generally performed in the past, but in the present embodiment, various combinations can be used as those that exhibit unique design properties.

  The thickness of the printing layer is usually about 0.5 to 20 μm, and preferably 1 to 10 μm. If the thickness of the printing layer is within the above range, it is possible to impart excellent design properties to the flooring material and to impart more excellent concealability.

The flooring of the present embodiment may have an adhesion layer on the surface opposite to the foamed resin layer side of the base material for adhesion to the base as desired. For the adhesion layer, for example, a pressure sensitive adhesive such as a rubber pressure sensitive adhesive, an acrylic pressure sensitive adhesive, a silicone pressure sensitive adhesive, a urethane pressure sensitive adhesive, and an epoxy pressure sensitive adhesive can be used.
The thickness of the adhesion layer is preferably 5 to 500 μm, more preferably 10 to 300 μm. When the thickness of the adhesion layer is in the above range, excellent adhesion can be obtained efficiently.

Moreover, when the flooring of this embodiment has an adhesion layer, in order to protect the adhesion surface of the adhesion layer, it has a release film (separator film) on the surface opposite to the substrate side of the adhesion layer. May be.
As the release film, a resin film can be preferably used, and examples thereof include a polyolefin film such as a polyester film and a polyethylene film. The thickness of the release film is preferably 10 to 50 μm, and more preferably 15 to 35 μm in consideration of protection of the adhesion surface of the adhesion layer and ease of handling.

(Method for manufacturing flooring)
The flooring of the present embodiment is formed by, for example, applying a foamed resin layer forming resin composition containing a polyvinyl chloride resin and a foaming agent on a base material to form a coating film, and heating the coating film. An unfoamed resin layer forming step, a printed layer forming step in which a printed layer is provided on the unfoamed resin layer, and a resin composition for forming a surface resin layer is applied on the unfoamed resin layer or the printed layer. A surface resin layer forming step of forming a coating film and heating, a foamed resin layer forming step of foaming the unfoamed resin layer, and an unevenness forming step of embossing from the surface resin layer side. it can.

The heating in the unfoamed resin layer forming step is preferably performed at a temperature of 180 to 240 ° C., and the resin composition for forming the foamed resin layer is preferably gelled, and the heating in the surface resin layer forming step is performed at a temperature of 200 to 300 ° C. It is preferable to gel the resin composition for forming a surface resin layer.
Foaming in the foamed resin layer forming step is not particularly limited as long as the foaming ratio and the thickness of the foamed resin layer are within the above ranges, but it is preferably performed at a temperature of 180 to 240 ° C., and performed in a foaming furnace. it can.

  In addition, the embossing in the unevenness forming step can be performed by an embossing method by heating and pressurization using a single-wafer or rotary embossing machine. Specifically, at least the surface of the surface resin layer is heated to about 130 to 160 ° C. with a heater or the like, and an embossed plate is applied to the surface of the surface resin layer to pressurize, thereby embossing the embossed plate. As a result, irregularities can be formed on the surface of the surface protective layer. In addition, you may perform this embossing in combination with chemical embossing.

EXAMPLES Next, although an Example demonstrates this invention further in detail, this invention is not limited at all by this example.
[Evaluation of curling resistance]
About the flooring (30 cm square size) obtained in each Example and Comparative Example, the following environmental test was performed, and then the maximum warp width (the warp width with respect to the ground) of the corner of the flooring was measured with a vernier caliper ("E- PITA30 (model number) ”(manufactured by Nakamura Seisakusho Co., Ltd.) was used and evaluated according to the following criteria.
(Environmental testing)
Place the flooring in an environmental test room (Hitachi temperature control (humidity control unit “EU-65HH-R (model number), manufactured by Hitachi Air Conditioning SE Co., Ltd.)”), and raise the temperature from 5 ° C. to 50 ° C. over 6 hours. Then, after holding at 50 ° C. for 6 hours, the temperature was lowered from 50 ° C. to 5 ° C. over 6 hours and held at 5 ° C. for 6 hours as one cycle, and this was performed for 5 cycles.
A: The warp width was less than 0.5 mm.
B: The warp width was 0.5 mm or more and less than 2.5 mm.
C: The warp width was 2.5 mm or more.

Example 1
Glass mixed paper (thickness: 0.3 mm, 30 cm square, “FG-6 (model number)”, manufactured by Mitsubishi Paper Industries Co., Ltd.) as a base material, and a resin composition for a foamed resin layer (polyvinyl chloride resin (Kaneka Corporation) Co., Ltd.): 100 parts by mass, foaming agent (azodicarbonamide): 2.5 parts by mass, foaming stabilizer (Ba-Zn composite stabilizer): 1 part by mass) was applied in a thickness of 0.7 mm. The resin composition was gelled by heating at 250 ° C. to form an unfoamed resin layer. Subsequently, on the unfoamed resin layer, a resin composition for a surface resin layer (polyvinyl chloride resin (manufactured by Kaneka Corporation): 100 parts by mass, plasticizer (dioctyl phthalate): 57 parts by mass, a stabilizer for transparency ( Ba-Zn composite stabilizer (1 part by mass) was applied at a thickness of 200 μm and heated at 200 ° C. to gel the resin composition to form a surface resin layer (thickness: 0.2 mm). Next, foaming was performed at 200 ° C. in a foaming furnace at a foaming ratio of 4.5 times to form a foamed resin layer (thickness: 3 mm), and then the surface of the surface resin layer was heated to 140 ° C. with a heater. Then, embossing was performed by heating and pressurizing with an embossed plate to form irregularities on the surface of the surface resin layer and cooling with water cooling to obtain a flooring. It has a bellows pattern (lattice shape) that is a rectangle, and all cells are cells. A MD direction length _{(L M0)} is 2 to 5 mm, a TD direction of the length of the cell _{(L T0)} is 1 to 4 mm, and, with respect to the TD direction of the length of the cell _{(L T0)} The MD length (L _M0 ) ratio (L _M0 / L _T0 ) satisfied 0.65 to 1.5, and the cells were provided on the entire flooring and occupied by the cells. The area ratio was 95% or more, the depth of the concave portion measured by microscopic measurement was 400 to 600 μm, and the width of the deepest portion of the concave portion was 520 to 550 μm, and a photograph of the surface of the flooring obtained in Example 1 is shown. (3-1) and a micrograph of the surface are shown as a diagram (4-1), in which the length (L _M0 ) of one cell in the MD direction and the TD direction of one cell are taken as an example. The length (L _T0 ) is entered, which is 4.2 mm and 3.6 mm, respectively.
The obtained flooring was evaluated for curl resistance by the above method. The evaluation results are shown in Table 1.

Examples 2 and 3
In Example 1, a flooring was produced in the same manner as in Example 1 except that the plasticizer shown in Table 1 was used. The obtained flooring was evaluated for curl resistance by the above method. The evaluation results are shown in Table 1. Moreover, the microscope picture of the cross section of the flooring of Example 2 is published as figure (4-2).

Example 4
In Example 1, for a surface resin layer in which a printed layer having a lattice-shaped pattern is provided by gravure printing on an unfoamed resin layer, and a plasticizer (dioctyl phthalate): 63 parts by mass on the printed layer The resin composition is applied, and on the surface of the surface resin layer, all the cells have a length (L _M0 ) in the MD direction of the cell of 0.1 to 0.5 mm, and the length of the cell in the TD direction ( L _T0 ) is 0.1 to 0.5 mm, and the ratio of the length (L _M0 ) in the MD direction to the length (L _T0 ) in the TD direction of the cell (L _M0 / L _T0 ) is 0. Grain pattern which is a substantially circular shape satisfying 85 to 1.15 (a pattern in which a substantially circular convex shape is provided substantially uniformly, and is schematically a pattern shown in FIG. 3-2). The flooring was prepared in the same manner as in Example 1 except that the unevenness of. The obtained flooring was evaluated for curl resistance by the above method. The evaluation results are shown in Table 1. A photograph of the surface of the flooring obtained in Example 4 is shown as Figure (3-2).

Example 5
In Example 4, a flooring was produced in the same manner as in Example 1 except that the plasticizer shown in Table 1 was used. The obtained flooring was evaluated for curl resistance by the above method. The evaluation results are shown in Table 1.

Comparative Example 1
In Example 1, a flooring was produced in the same manner as in Example 1 except that the unevenness of the wood conduit pattern was formed by embossing. The obtained flooring was evaluated for curl resistance by the above method. The evaluation results are shown in Table 1. A photograph of the surface of the flooring obtained in Comparative Example 1 is shown as Figure (5-1).

Comparative Example 2
In Example 1, a flooring was produced in the same manner as in Example 1 except that the unevenness by embossing was not formed. The obtained flooring was evaluated for curl resistance by the above method. The evaluation results are shown in Table 1. A photograph of the surface of the flooring obtained in Comparative Example 2 is shown as Figure (5-2).

[note]
DOP: Dioctyl phthalate DOA: Dioctyl adipate

From the above examples, it was confirmed that the flooring of this embodiment has excellent curl resistance. Further, it was confirmed that when the amount of the plasticizer used in the surface resin layer is increased, the curling resistance is improved, and that by using dioctyl adipate as the plasticizer, the curling resistance is further improved. On the back surface of the flooring material used in the evaluation of the curl resistance, no material such as an adhesive or a pressure-sensitive adhesive that exhibits adhesion to the ground is applied. Therefore, the curling resistance of the flooring material of this embodiment is excellent in that it does not generate curl even if it is installed on the floor without applying an adhesive or the like that expresses adhesion with the groundwork, that is, in the form of standing. It was confirmed that the curl resistance was developed.
On the other hand, according to Comparative Example 1, when the irregularities such as a wood grain conduit pattern in which substantially rectangular cells (L _M0 / L _T0 = 10 or more) having a very long long side are mainly assembled, an effect of improving curling resistance is obtained. It was confirmed that the flooring material of Comparative Example 2 having no irregularities also had poor evaluation of curl resistance.

Claims (6)

A vinyl-based flooring having a base material, a foamed resin layer, and a surface resin layer in order, wherein the foaming resin layer has a foaming ratio of 3 to 10 times, and at least one of the foamed resin layer and the surface resin layer is chlorinated. It is a layer formed using a vinyl resin, and has unevenness due to a plurality of cells on the surface of the surface resin layer opposite to the base, and the length of the cell in the MD direction (L _M0 ) is 0.1. The length in the TD direction (L _T0 ) of the cell is 0.1 to 50 mm, and the length in the MD direction (L _M0 ) with respect to the length in the TD direction (L _T0 ) of the cell vinyl flooring ratio of _(L M0 _/ L _T0) is 0.25-4.   The vinyl-based flooring according to claim 1, wherein the base material contains a glass material.   The surface resin layer is a layer composed of a resin composition containing a vinyl chloride resin and a plasticizer, wherein the plasticizer content is 40 to 80 parts by mass with respect to 100 parts by mass of the vinyl chloride resin. The vinyl flooring according to 1 or 2.   The vinyl flooring according to claim 3, wherein the plasticizer is a cold-resistant plasticizer.   The vinyl-based flooring according to any one of claims 1 to 4, wherein the foamed resin layer has a thickness of 2 to 4 mm.   The vinyl flooring according to any one of claims 1 to 5, wherein the thickness is 2.5 to 4.5 mm.