JP2012046899A - Floor material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a floor material which has a shock absorption performance for reducing a shock to be received from a floor when a person falls down, and prevents the decline of a walking feeling and the generation of a level difference by preventing excessive sinking during walking.SOLUTION: A floor material 1 is composed by successively laminating a first base material 2, a first buffer material 3, a second base material 4 and a second buffer material 5 from the surface side. The thickness of the second base material is equal to or larger than 3.0 mm and is equal to or more than 35% of the thickness of the entire floor material. For the second buffer material, the thickness is 3.0-5.0 mm and Asker C hardness is 20-70 degrees. For the floor material satisfying these conditions, it is confirmed that the value of the maximum acceleration measured by a measurement method of JIS A 6519 is sufficiently below 100 G, the shock absorption performance is excellent, and matters formed on a surface of the first base material and a butt end of the second base material are not broken even when a shock is received.

Description

  The present invention relates to a flooring, and more particularly to a flooring excellent in shock absorbing performance.

  There are frequent accidents in which injuries are caused by the impact of flooring when an elderly person or a disabled person falls in the room where the flooring is laid, and there are many cases of serious injury such as broken bones. For this reason, it is desired to develop a flooring material having a function of reducing the impact from the flooring material when it falls, that is, a shock absorbing performance. According to a report from the Architectural Institute of Japan Floor Work WG, if the value of the maximum acceleration (G value) measured by the measuring method of JIS A6519 is 100G or less, when a human falls and hits his head etc. on the floor Even if there is, it is said that it is hard to suffer injury.

  Against this background, Patent Document 1 discloses that shock absorbers having an Asker C hardness of 70 degrees or less and a thickness of 2 mm or more are laminated on the back surface of the surface material, thereby obtaining a maximum acceleration of 80 G or less as measured above. It is described that a wooden flooring having performance can be obtained.

JP 2010-47979 A

  In the wooden flooring described in Patent Document 1, plywood or wood fiber board having a thickness of about 2 to 13 mm is used as the surface material (2 mm and 4 mm thick plywood in the embodiment), and the thickness is used as the shock absorbing material. Synthetic resin foams or rubber foams of 2 mm or more are supposed to be used. However, a certain amount of thickness is required for the impact absorbing material to exhibit the desired impact absorbing performance, and the flooring material as a whole. Tended to be thick.

  In addition, it is generally performed that floor materials are formed with male seeds at the end of two adjacent sides and female ends at the other end of the two ends, and the flooring is connected to each other through the fitting between the fruits. However, since a fruit cannot be formed on a shock absorber made of a soft synthetic resin foam or rubber foam, the back surface of the shock absorber as described in claim 2 of the patent document 1 and the examples. Further, it is necessary to provide a back material such as a 4 mm thick plywood on the side to form fruit on the back material, and the overall thickness of the floor material has become large.

  For this reason, there is a step between a room where a thick flooring with shock absorbing performance is constructed and a room where a thin flooring without shock absorbing performance is constructed. Could cause serious problems. Although it is possible to eliminate the step by providing a height adjusting material such as joists or plywood on the back surface of the floor material, it is not preferable because it requires extra work and cost.

  In addition, it is possible to reduce the step by making the surface material thinner for floor materials with shock absorption performance, or thicker surface material for floor materials that do not have shock absorption performance. However, in the former case, the thin surface material is bent and easily broken and the durability is lowered. In the latter case, the use of the thick surface material increases the cost. Furthermore, since the amount of deflection when receiving a load varies depending on the thickness of the surface material, this may cause actual breakage.

  In addition, when the shock absorbing material is thick, the shock absorbing performance is improved, but when the person walks, the shock absorbing material sinks more and the walking feeling becomes worse. In addition, there is a step between the floor material that receives the load of the person walking and the floor material that does not receive the load adjacent to it, which may cause tripping during walking or the adjacent floor material that appears due to the step. There is a risk that an object may collide with the side end and damage the flooring.

  In order to reduce the sinking amount due to the thickness of the shock absorber, methods such as reducing the thickness of the shock absorber or increasing the hardness of the shock absorber can be considered. In practice, this is a difficult method to adopt.

  Accordingly, the problem to be solved by the present invention is that a floor material having a shock absorbing performance that reduces the impact received from the floor when a person falls down is a step difference in floor construction height with a room that does not require the shock absorbing performance. And a novel structure for preventing a decrease in walking feeling and generation of a step by preventing excessive sinking during walking.

  In order to solve this problem, the present invention according to claim 1 is formed by sequentially laminating a first base material, a first buffer material, a second base material, and a second buffer material from the surface side. It is a flooring material, the second base material has a thickness of 3 mm or more and occupies 35% or more of the entire flooring material, and the second cushioning material has a thickness of 3.0 to 5.0 mm. And Asker C hardness is 20 to 70 degrees.

  As described in claim 1, the present invention provides a floor material having a laminated structure of a first base material / first buffer material / second base material / second buffer material from the front surface side, and two layers on the back surface side. In other words, the thickness of each of the second base material and the second buffer material is specified within a specific range, and the hardness of the second buffer material is further specified within a specific range, thereby achieving the above-described object. .

  More specifically, when the thickness of the second base material is 3 mm or more and 35% or more of the entire flooring material, the second base material becomes difficult to bend, and when receiving a load from the surface of the flooring material, Since the impact can be uniformly dispersed from the second base material to the second cushioning material, the cushioning effect is increased.

  In addition, by using a second cushioning material having a thickness of 3.0 to 5.0 mm and an Asker C hardness of 20 to 70 degrees, the sinking when receiving an impact is reduced and the feeling of walking is reduced. To prevent. Furthermore, since the sinking of the second buffer material is reduced, the fitting state between the fruit formed on the second base material of the flooring material and the fruit formed on the second base material of the adjacent flooring material Is properly maintained, and actual breakage can be prevented.

  In addition, about the impact absorption performance in the floor material which has the laminated structure of the 1st base material / the 1st buffer material / the 2nd base material / the 2nd buffer material from the surface side, the 1st base material and the 1st buffer material mainly collide. It is considered that it is mainly due to the second base material and the second cushioning material that plays a role of absorbing the intended impact of time and cushions the entire impact of the impacting object. In the present invention, since the objective of the present invention is to eliminate the lowering of walking feeling due to excessive sinking while sufficiently exhibiting the latter shock buffering action, particularly the first base material and the first buffer material are set with conditions. Instead, the above-mentioned specific matters were imposed on the second base material and the second buffer material to constitute the present invention.

It is sectional drawing which shows the structure of the flooring by this invention.

  First, the structure of the flooring according to the present invention will be described with reference to FIG. As shown in FIG. 1, the flooring 1 according to the present invention has a laminated structure of a first base material 2 / first buffer material 3 / second base material 4 / second buffer material 5 from the surface side.

  The first base material 2 is made of, for example, a wood fiber board such as MDF or HDF, a wood board such as a plywood, a solid board, a laminated board or a laminated board. A decorative sheet such as a resin sheet is attached. Moreover, arbitrary coating can be given to the surface of the 1st base material 2, or the surface of the decorative sheet stuck on this surface. The coating is preferably performed using an anti-slip paint having anti-slip performance.

  The thickness of the first substrate 2 is preferably 0.5 to 1.5 mm. If the thickness is less than 0.5 mm, the surface strength is weak, and damage or dents are likely to occur upon impact. If it is thicker than 1.5 mm, the (initial) shock absorbing performance that the first cushioning material 3 laminated on the back surface should exhibit is impaired.

  The first buffer material 3 is, for example, a synthetic resin foam such as ethylene vinyl acetate copolymer (EVA), ethylene-vinyl alcohol copolymer (EVOH), polyethylene (PE), polyurethane (PU), synthetic rubber, natural It is made of a rubber foam such as rubber, and preferably has an Asker C hardness of 20 to 70 degrees. If the Asker C hardness is less than 20 degrees, it is too soft and the sinking during walking increases, resulting in discomfort. In addition, when a person falls, the impact received from the first base material 2 cannot be sufficiently buffered, and there is a risk that the head of the person who has fallen or the like will be strongly struck against the lower second base material 4. On the other hand, if the Asker C hardness is larger than 70 degrees, it becomes too hard as a buffer material and cannot sufficiently exhibit the impact absorbing function. From these factors, the Asker C hardness range of the first buffer material 3 is 20 to 70 degrees, preferably 35 to 60 degrees.

  The thickness of the first buffer material 3 is preferably 0.5 to 2.5 mm. If the thickness is less than 0.5 mm, the impact absorbing performance is insufficient, and it becomes difficult to obtain a value of 100 G or less in the floor hardness test. When it becomes thicker than 2.5 mm, the first base material 2 will be greatly bent when the first base material 2 receives an impact, and the first base material 2 is easily cracked.

  The second base material 4 is made of a wood material such as a wood fiber board such as MDF and HDF, a plywood, a solid material, a laminated board, and a laminated material, similarly to the first base material 2.

  Since it is necessary to form the fruit (male, female) which fits with the floor material adjacent at the time of construction in the 2nd base material 4 in a quadrant wood mouth surface, it shall be the thickness of 3.0 mm or more. If the thickness is less than 3.0 mm, it is difficult to form a fruit in this thickness range. Preferably it is 5.0 mm or more. On the other hand, if it is too thick, the weight of the entire flooring will increase, making it difficult to handle the flooring during transportation and construction. In addition, when warpage occurs in the manufacturing process, it becomes difficult to correct the warpage. Furthermore, when laminated with the first base material 2, the first buffer material 3, and the second base material 4, it becomes a thick floor material as a floor material, and the floor construction height with a room that does not require shock absorbing performance. Steps are likely to occur. From these, it is preferable that the thickness of the 2nd base material 4 is 15 mm or less.

  Furthermore, the thickness of the second base material 4 is 35% or more of the total thickness of the flooring 1. If the thickness of the second base material 4 is less than 35% of the total thickness, the second base material is too thin with respect to the total thickness of the flooring material, and the balance of the entire flooring material is lost, which is necessary. It is difficult to obtain shock absorbing performance.

The second substrate 4 preferably has a bending Young's modulus of 1500 to 8000 N / mm ² and a bending rigidity of 600 kN · mm ² . The impact received by the floor material surface is transmitted from the first base material 2 to the first buffer material 3, the second base material 4, and further to the second buffer material 5, and the second base material has a bending Young's modulus in the above range and When it has bending rigidity, it is hard to bend with respect to an impact, and the impact received by the second base material can be uniformly dispersed with respect to the second cushioning material. In order to exhibit this effect, the second base material preferably has a bending Young's modulus of 1500 N / mm ² or more and a bending rigidity of 600 kN · mm ² . Moreover, when the bending Young's modulus of a 2nd base material exceeds 8000 N / mm < ² >, it will become too hard as a board | substrate, will become weak and will become a flooring material with few durability which is easy to be cracked by an impact.

  The second buffer material 5 is, for example, a synthetic resin foam such as polyurethane (PU), ethylene vinyl acetate copolymer (EVA), polyethylene (PE), vinyl chloride (PVC), or rubber foam such as synthetic rubber or natural rubber. It may be a closed-cell foam or an open-cell foam. Moreover, it is preferable that a waterproof or moisture-proof sheet is attached to the back surface of the second cushioning material 5.

  The thickness of the second buffer material 5 is 3.0 to 5.0 mm. If this thickness is less than 3.0 mm, the impact absorbing performance becomes insufficient, and it becomes difficult to obtain a value of 100 G or less in the floor hardness test. When it becomes thicker than 5.0 mm, the thickness of the entire flooring material becomes too large, and a level difference is likely to occur in the floor construction height with a room that does not require shock absorbing performance. Moreover, it is too soft and the sinking at the time of a walk becomes large, and uncomfortable feeling is given.

  The second cushioning material 5 has an Asker C hardness of 20 to 70 degrees. If the Asker C hardness of the second cushioning material 5 is less than 20 degrees, it will be too soft and the sinking during walking will become large, giving an uncomfortable feeling. Moreover, since the 2nd buffer material 5 is affixed on the back surface of the 2nd base material 4 in which a fruit is formed, when the 2nd base material 4 sinks, the fruit fitted with the adjacent flooring will be damaged. There is a risk. On the other hand, if the Asker C hardness is larger than 70 degrees, it becomes too hard as a buffer material and cannot sufficiently exhibit the impact absorbing function. From these factors, the Asker C hardness range of the first buffer material 3 is preferably 20 to 70 degrees, more preferably 25 to 45 degrees.

  Hereinafter, the configuration and operational effects of the present invention will be more specifically demonstrated by describing examples of the present invention in comparison with comparative examples. In addition, this invention is not limited to the following Example, It cannot be overemphasized that various deformation | transformation and change are accept | permitted within the range of the invention defined by description of a claim.

  Various flooring samples shown in Tables 1 to 4 are prepared as the flooring 1 having the laminated structure of the first base material 2 / first buffer material 3 / second base material 4 / second buffer material 5 shown in FIG. And it was connected and constructed on the floor base through the fitting between the fruits. Then, for each flooring sample, the maximum acceleration is measured by the measuring method of JIS A6519 to evaluate the impact absorption performance, and whether or not the surface of the first base material 2 is damaged when receiving an impact is visually confirmed. Further, after the impact test, the flooring material sample was peeled off to visually check whether the fruit was damaged. These evaluations are also shown in Tables 1 to 4.

  More specifically, in each flooring sample, MDF having a thickness of 1.0 mm was used for the first base material, and EVA having a thickness of 1.2 mm and Asker C hardness of 45 degrees was commonly used for the first buffer material. Above, the data and results of tests conducted by changing the thickness of the MDF used as the second base material and also changing the thickness of the PU used as the second cushioning material and the Asker C hardness are shown. 1 to 3 are shown. Floor material samples a-2 to a-7 in Table 1, floor material samples b-2 to b-4 in Table 2, and floor material samples c-2 to c-6 in Table 3 are examples of the present invention. Each of these was confirmed to have a G value of 100 G or less and sufficient impact absorbing performance, and even when subjected to an impact, no damage was observed on the surface of the first base material. The fruit formed on the base of the base material was not damaged. In addition, although the different sample numbers are attached | subjected to each table | surface, flooring material sample a-3, b-3, c-3 is the same Example of this invention.

  First, Table 1 shows that the flooring material having the laminated configuration of FIG. 1 has the same conditions for the first base material and the first cushioning material as described above, and the same conditions for the second cushioning material (thickness 4. 0 mm, PU with an Asker C hardness of 30 degrees), and changing the thickness of the second base material in seven ways within the range of 2.0 to 21 mm, producing flooring samples a-1 to a-7 The data and result of the test conducted in order to confirm the influence by the thickness of a 2nd base material are shown. As can be seen from the results shown here, the samples a-2 to a-7 in which the thickness of the second base material is 4.0 mm or more all have a G value of 100 G or less, excellent shock absorption performance, and impact. Even if it was received, the surface and the fruit of the first base material were not damaged, and the durability was excellent. In particular, samples A-3 and later having a thickness of 7.0 mm or more had a G value of less than 90 G, and extremely excellent shock absorbing performance. On the other hand, in sample a-1 in which the thickness of the second base material was 2.0 mm, the impact absorption performance was insufficient, and breakage was actually observed. From this result, in order to prevent actual breakage due to impact while exhibiting sufficient shock absorbing performance, the thickness of the second base material 2 should be 3.0 mm or more, preferably 5.0 mm or more. confirmed. Moreover, the ratio with respect to the whole thickness of the 2nd base material in the sample of these Example of this invention was all 35% or more, and it was confirmed that this lower limit has significance.

  Table 2 shows the same conditions for the first base material and the first buffer material as described above, and the same conditions for the second base material (MDF having a thickness of 7.0 mm). ) And changing the thickness of the second cushioning material (Asker C hardness is the same at 30 degrees) to five in the range of 2.5 to 8.0 mm, and changing the flooring samples b-1 to b-5 The data and the result of the test which were produced and confirmed in order to confirm the influence by the thickness of a 2nd buffer material are shown. As can be seen from the results shown here, the samples b-2 to b-4 having the second buffer material having a thickness of 3.0 to 5.0 mm all have a G value of 100 G or less and excellent shock absorption performance. Although the surface and the fruit of the first base material were not damaged even when subjected to an impact, the sample b-1 in which the thickness of the second buffer material was 2.5 mm had a G value exceeding 100 G. The shock absorbing performance was insufficient. Sample b-5 having a second cushioning material having a thickness of 8.0 mm was sufficiently excellent in shock absorption performance, but the fruit was damaged by the impact. From this result, it was confirmed that the thickness of the second cushioning material should be within the range of 3.0 to 5.0 mm in order to prevent actual breakage due to impact while exhibiting sufficient shock absorbing performance. It was.

  Table 3 shows the same conditions for the first base material and the first cushioning material as described above, and the same conditions for the second base material (MDF having a thickness of 7.0 mm). The floor material samples c-1 to c-7 were prepared by changing the Asker C hardness of the second buffer material (thickness is the same at 4.0 mm) in seven ways within a range of 10 to 80 degrees. The data and results of tests conducted to confirm the influence of the hardness of the second buffer material are shown. As can be seen from the results shown here, the samples c-2 to c-6, in which the hardness of the second buffer material is 20 to 65 degrees, all have a G value of 100 G or less, have excellent shock absorption performance, and receive impact. However, the surface and the fruit of the first base material were not damaged. In particular, the samples c-3 to c-5, in which the hardness of the second buffer material is 30 to 40 degrees, all have a G value of 90 G or less and have extremely excellent impact absorbing performance. On the other hand, both the sample c-1 in which the hardness of the second buffer material is 10 degrees and the sample c-7 in which the hardness is 80 degrees have a G value exceeding 100 G, and the impact absorption performance is insufficient. The reason for this is that in the former, the second cushioning material becomes too soft, sinks greatly due to the impact received by the first base material, and the impact transmitted almost directly to the floor base material rebounds greatly, In the latter case, the second cushioning material is too hard to absorb the impact received by the first base material, and the impact transmitted to the floor base material bounces back greatly. It was thought that the performance could not be demonstrated. From this result, it was confirmed that the Asker C hardness of the second buffer material was 20 to 70 degrees, and more preferably 25 to 45 degrees.

  According to these tests, in the floor material having the above-described laminated structure, the thickness of the second base material is 3 mm or more, and the thickness of the second buffer material is within a range of 3.0 to 5.0 mm. Since the necessary condition that the Asker C hardness is in the range of 20 to 70 degrees has been confirmed, these are the same conditions (the MDF having a thickness of 7.0 mm for the second base material, the second For the buffer material, the thickness is 4.0 mm and the PU having an Asker C hardness of 30 degrees), the thickness of the MDF as the first base material, the thickness of the EVA as the first buffer material, and the Asker C hardness. The flooring samples d-1 to d-8 were prepared by combining variously, and the same test was performed to confirm the influence of the conditions of the first base material and the first buffer material. The test data and evaluation are shown in Table 4.

  As can be seen from the results shown here, these samples d-1 to d-8 all have a G value lower than the recommended value 100G, and even when subjected to an impact, the surface and the actual surface of the first substrate are damaged. It was excellent in durability. From this result, even if there is no particular condition for the first base material and the first buffer material, the object of the present invention is cleared as long as each condition is satisfied for the second base material and the second buffer material. It was confirmed that a flooring material to be obtained was obtained.

  In the floor material samples shown in Tables 1 to 4, MDF was used for the first base material and the second base material, and EVA and PU were used for the first buffer material and the second buffer material, respectively. , In place of other materials (for example, plywood as one or both of them) for the first base material and the second base material, and for other materials (for example, EVOH in the first buffer material) Even when a similar test was conducted in place of EVA for the second buffer material, no significant difference was found from the above results. Therefore, it was confirmed that the material used for each of these layers is not limited in the present invention.

1 Floor material 2 First base material 3 First buffer material 4 Second base material 5 Second buffer material

Claims (1)

A flooring material having a laminated structure of a first base material / first buffer material / second base material / second buffer material, wherein the second base material has a thickness of 3 mm or more and 35% of the entire flooring material A flooring material having a thickness that occupies the above, wherein the second buffer material has a thickness of 3.0 to 5.0 mm and an Asker C hardness of 20 to 70 degrees.

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