WO2013054893A1 - シート用パッド - Google Patents
シート用パッド Download PDFInfo
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- WO2013054893A1 WO2013054893A1 PCT/JP2012/076463 JP2012076463W WO2013054893A1 WO 2013054893 A1 WO2013054893 A1 WO 2013054893A1 JP 2012076463 W JP2012076463 W JP 2012076463W WO 2013054893 A1 WO2013054893 A1 WO 2013054893A1
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- foam
- layer
- test piece
- feeling
- hardness
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- 239000006260 foam Substances 0.000 claims description 106
- 238000005187 foaming Methods 0.000 abstract description 9
- 238000012360 testing method Methods 0.000 description 89
- 239000010410 layer Substances 0.000 description 75
- 230000000052 comparative effect Effects 0.000 description 21
- 230000001953 sensory effect Effects 0.000 description 21
- 238000011156 evaluation Methods 0.000 description 16
- 238000012795 verification Methods 0.000 description 10
- 125000000524 functional group Chemical group 0.000 description 9
- 229920005862 polyol Polymers 0.000 description 9
- 150000003077 polyols Chemical class 0.000 description 9
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- 238000002474 experimental method Methods 0.000 description 7
- 239000000463 material Substances 0.000 description 7
- 238000000034 method Methods 0.000 description 7
- 238000005259 measurement Methods 0.000 description 6
- 229920001451 polypropylene glycol Polymers 0.000 description 6
- 239000004721 Polyphenylene oxide Substances 0.000 description 4
- 230000006835 compression Effects 0.000 description 4
- 238000007906 compression Methods 0.000 description 4
- 238000002156 mixing Methods 0.000 description 4
- 229920000570 polyether Polymers 0.000 description 4
- 239000002356 single layer Substances 0.000 description 4
- IMNIMPAHZVJRPE-UHFFFAOYSA-N triethylenediamine Chemical compound C1CN2CCN1CC2 IMNIMPAHZVJRPE-UHFFFAOYSA-N 0.000 description 4
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 3
- 239000003431 cross linking reagent Substances 0.000 description 3
- 229920002323 Silicone foam Polymers 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 239000000470 constituent Substances 0.000 description 2
- 239000012792 core layer Substances 0.000 description 2
- 238000013016 damping Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 239000013514 silicone foam Substances 0.000 description 2
- 239000003381 stabilizer Substances 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
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- 230000006872 improvement Effects 0.000 description 1
- 239000012948 isocyanate Substances 0.000 description 1
- 150000002513 isocyanates Chemical class 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
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Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
- B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
- B60N2/90—Details or parts not otherwise provided for
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47C—CHAIRS; SOFAS; BEDS
- A47C27/00—Spring, stuffed or fluid mattresses or cushions specially adapted for chairs, beds or sofas
- A47C27/14—Spring, stuffed or fluid mattresses or cushions specially adapted for chairs, beds or sofas with foamed material inlays
- A47C27/15—Spring, stuffed or fluid mattresses or cushions specially adapted for chairs, beds or sofas with foamed material inlays consisting of two or more layers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
- B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
- B60N2/70—Upholstery springs ; Upholstery
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
- B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
- B60N2/70—Upholstery springs ; Upholstery
- B60N2/7017—Upholstery springs ; Upholstery characterised by the manufacturing process; manufacturing upholstery or upholstery springs not otherwise provided for
Definitions
- the present invention relates to a seat pad.
- This application claims priority based on Japanese Patent Application No. 2011-226759 filed in Japan on October 14, 2011, the contents of which are incorporated herein by reference.
- a seat pad attached to a vehicle and used as a seating portion for example, a configuration as shown in Patent Document 1 below is known.
- the vehicle may travel on a gentle curve or change lanes while traveling, and vibrations in a low frequency band around 1 Hz may be input to the seat pad that is mounted.
- the seat pad may be deformed, so that the occupant may feel wobbling such as skidding or rolling around the roll axis of the vehicle.
- thin seat pads are generally made of a highly cushioning (repulsive) material from the standpoints of deflection, springiness, and feeling of bottoming. Is easily felt.
- the present invention has been made in view of the above-described circumstances, and the object thereof is to suppress the wobbling feeling felt by the occupant due to deformation (that is, while ensuring the occupant's stability), and the cushioning property at the time of sitting ( It is to provide a pad for a seat that can easily secure a cushion feeling.
- the seat pad according to the present invention is a seat pad that is attached to a vehicle and used as a seating part, and is laminated with each other, a first layer made of a first foam and a second layer made of a second foam.
- the first foam has at least one of Asker F hardness and hysteresis loss greater than the second foam, and the second foam is more repulsive than the first foam. High elastic modulus.
- the first foam has at least one of Asker F hardness and hysteresis loss greater than that of the second foam, the wobbling feeling felt by the occupant due to the deformation is suppressed (that is, the occupant's stability is reduced).
- the Asker F hardness of the first foam is larger than the Asker F hardness of the second foam, the deformation of the first layer when vibration in a low frequency band is input can be suppressed.
- the 1st layer can be provided with the high damping property with respect to the vibration of a low frequency band. As a result, it is possible to attenuate the deformation of the seat pad so that the occupant feels the wobble feeling, and the wobble feeling that the occupant feels due to the deformation can be suppressed.
- the seat pad can be easily provided with cushioning properties when seated.
- the seat pad of the present invention it is possible to easily secure the cushioning property at the time of sitting while suppressing the wobble feeling felt by the occupant due to the deformation.
- the first foam may have a larger hysteresis loss than the second foam.
- the Asker F hardness often varies depending on the measurement site, but the hysteresis loss has little difference depending on the measurement site. Therefore, the hysteresis loss is superior as an index representing the physical properties of the resin (for example, resin viscosity and air permeability that affects the damping property).
- the first layer may be arranged on the upper layer side. In this case, it is possible to more effectively suppress the wobble feeling felt by the passenger due to the deformation.
- the second layer may be disposed on the lower layer side. In this case, the cushioning property at the time of sitting can be secured more easily.
- the thickness of the first layer may be 30% to 50% with respect to the total thickness of the first layer and the second layer. In this case, a reduction in the wobbling feeling felt by the occupant due to the deformation and an improvement in cushioning at the time of sitting are achieved in a well-balanced manner.
- the total thickness of the first layer and the second layer may be 70 mm or less. In this case, even if the seat pad is formed thin, it is possible to easily secure the cushioning property at the time of sitting while suppressing the wobble feeling felt by the occupant due to the deformation.
- the first foam has at least Asker F hardness greater than that of the second foam, and the first layer is disposed on the seating surface side of the seat pad with respect to the second layer. May be.
- the Asker F hardness of the first foam is larger than the Asker F hardness of the second foam, as described above, the deformation of the first layer when vibration in the low frequency band is input is suppressed. It is possible to suppress the wobble feeling felt by the passenger due to the deformation.
- the first layer is arranged on the seating surface side with respect to the second layer, and the portion located on the seating surface side in the seat pad is constituted by the first layer. Can be suppressed. Thereby, for example, the wobble feeling felt by the occupant due to the deformation can be effectively suppressed as compared with the case where the deformation of the portion located on the side opposite to the seating surface is suppressed in the seat pad.
- the seat pad according to the present invention it is possible to easily secure the cushioning property (cushion feeling) at the time of sitting while suppressing the wobbling feeling felt by the occupant due to deformation (that is, ensuring the occupant's stability). it can.
- the sheet pad 10 has a two-layer structure in which a first layer 11 made of a first foam A and a second layer 12 made of a second foam B are stacked on each other. .
- the first layer 11 is disposed on the seating surface side of the seat pad 10 with respect to the second layer 12. That is, the first layer 11 constitutes a portion located on the seating surface side in the seat pad 10, and the surface of the first layer 11 constitutes the seating surface of the seat pad 10.
- Each of the first foam A and the second foam B is a urethane foam (urethane foam) formed by foaming a resin material.
- the first layer 11 and the second layer 12 are formed by respectively forming the first foam A and the second foam B into layers.
- the 1st layer 11 and the 2nd layer 12 may be integrally shape
- the first layer 11 and the second layer 12 may have the same thickness, the first layer 11 may be thicker than the second layer 12, and the second layer 12 may be thicker than the first layer 11. May be thick.
- the first foam A has a larger Asker F hardness and hysteresis loss than the second foam B, and the second foam B has a larger rebound resilience than the first foam A. It has become. Further, in the illustrated example, the first foam A has a larger tan ⁇ with respect to vibration of 1 Hz than the second foam B.
- the first test piece (not shown) formed by the first foam A has a Asker F hardness more than the second test piece (not shown) formed in the same shape and size as the first test piece by the second foam B.
- the tan ⁇ with respect to hysteresis loss and 1 Hz vibration is large, and the second test piece has a larger rebound resilience than the first test piece.
- the Asker F hardness of the first test piece is: For example, it is about 55 ° or more and less than 80 °.
- the Asker F hardness of the second test piece is, for example, about 40 ° or more and less than 65 °.
- the 25% hardness of each of the first test piece and the second test piece is equivalent to each other.
- the hysteresis loss of the first test piece is, for example, about 20% or more and less than 35%
- the hysteresis loss of the second test piece is, for example, about 10% or more and less than 25%.
- the rebound resilience of the first test piece is, for example, about 50% or more and less than 65%
- the rebound resilience of the second test piece is, for example, about 65% or more and less than 80%.
- tan ⁇ with respect to 1 Hz vibration of the first test piece is, for example, about 0.13 or more and less than 0.28
- tan ⁇ with respect to 1 Hz vibration of the second test piece is, for example, about 0.10 or more and 0.16. It is less than about.
- a plurality of escape holes (for example, a diameter of about 6 mm) through which air from the test piece is released are formed in the horizontal table at an equal interval (for example, a distance between the centers of about 19 mm). Then, with the test piece pressed by a pressure plate and compressed by, for example, about 30%, a vibration having a frequency of 1 Hz and an amplitude of, for example, ⁇ 2.5 mm is applied in the vertical direction, and tan ⁇ with respect to the vibration of 1 Hz is measured. .
- the first resin material used for the first foam A and the second resin material used for the second foam B each contain, for example, a polyol component and an isocyanate component as main components.
- a polyol component of the 1st foam A what mixed 2 types of PPG (polypropylene glycol) from which molecular weight differs can be employ
- the first layer 11 is disposed on the seating surface side with respect to the second layer 12, and the portion located on the seating surface side in the seat pad 10 is constituted by the first layer 11.
- Deformation can be suppressed.
- the wobbling feeling felt by the occupant due to the deformation is effectively suppressed (that is, the occupant stability).
- Feeling can be effectively secured).
- the technical scope of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.
- the first layer 11 is disposed on the seating surface side of the seat pad 10 with respect to the second layer 12.
- the second layer 12 is disposed on the first layer 11. And it may be arranged on the seating surface side.
- the 1st foam A assumed that both Asker F hardness and hysteresis loss were larger than the 2nd foam B, it is not restricted to this, The 1st foam A It is sufficient that at least one of Asker F hardness and hysteresis loss is larger than that of the second foam B.
- the Asker F hardness of the first foam A is larger than the Asker F hardness of the second foam B, and the hysteresis loss of the first foam A is smaller than the hysteresis loss of the second foam B.
- the Asker F hardness and hysteresis loss of one test piece and the Asker F hardness and hysteresis loss of the second test piece may be set within the above-described numerical ranges, respectively.
- the thickness of the second layer 12 may be 50% or more with respect to the thickness of the sheet pad 10.
- the present invention can be suitably applied to a thin sheet pad 10 having a thickness of 70 mm or less, as in the above-described embodiment.
- the present invention is applied to a sheet pad 10 having a thickness of 70 mm or more. May be.
- each of the first layer 11 and the second layer 12 is formed by individual molds, but the present invention is not limited to this, and the first layer 11 and the second layer 12 are slab products. Also good.
- a molded product with a mold a high-density skin layer is formed on the surface, so that the air permeability is reduced, so that the external input such as vibration caused by seating or running of the vehicle is good (that is, vibration absorption) It becomes.
- the density distribution since the density distribution is small, there is an advantage that even if the seat pad is compressed at the time of seating or the like, the seat pad is uniformly pressed and permanent distortion is hardly generated.
- Foam a and foam b were formed by foaming resin materials having the composition shown in Table 1 below, and used as the first foam and the second foam, respectively.
- Polyether polyol A average molecular weight 7500, number of functional groups 3, EO 13 mol%, PO 87 mol% Polyether polyol B: average molecular weight 700, number of functional groups 3, PO 100 mol% Polymer polyol: average molecular weight 5000, number of functional groups 3, EO 15 mol%, PO 85 mol% Crosslinking agent: average molecular weight 400, number of functional groups 4, EO 100 mol% Catalyst: Triethylenediamine (manufactured by Tosoh Corporation) Silicone foam stabilizer: SZ1325 (manufactured by Dow Corning Toray)
- each of the sheet pads of Examples 1 to 7 has two layers in which a first layer made of foam a (first foam) and a second layer made of foam b (second foam) are laminated to each other. Structure.
- the sheet pad of Comparative Example 1 has a single-layer structure composed of a first layer made of foam a (first foam).
- the sheet pad of Comparative Example 2 has a single-layer structure composed of a second layer composed of a foam b (second foam).
- the thickness (mm) of the first layer and the second layer in each seat pad and the layer located on the seating surface side in each seat pad are shown in Table 2 below.
- the first test piece is made from the foam a (first foam) to the foam b (first foam) so as to form a square shape with a side length of 400 mm in the top view as described above.
- Second test pieces were respectively formed from the second foam).
- the anchor F hardness (°), hysteresis loss (%), rebound resilience (%), and tan ⁇ with respect to vibration of 1 Hz of the first test piece and the second test piece are as shown in Table 3 below. It has become.
- first test piece made of foam a (first foam) and a second test piece made of foam b (second foam), each having a square shape with a side length of 400 mm in a top view, It was formed by changing the thickness.
- the anchor F hardness (°), hysteresis loss (%), rebound resilience (%), and tan ⁇ with respect to vibration of 1 Hz in the respective thicknesses of the first test piece and the second test piece. It has become.
- the rebound resilience is a measurement of the core layer excluding the skin layer.
- Comparative Example 1 the evaluation of the cushioning property is 1, and in Comparative Example 2, the evaluation of the wobble feeling is 1.
- the evaluation of wobble feeling and cushioning property was 2 or more, and it was confirmed that the cushioning property at the time of sitting was ensured while suppressing the wobble feeling felt by the passenger due to deformation. It was done.
- Examples 1 to 5 it was confirmed that evaluations of wobbling feeling and cushioning properties were particularly high in Examples 3 and 4.
- a second sensory test was performed to compare the wobbling feeling of the sheet pad of Example 3 and the wobbling feeling of the sheet pads of Comparative Examples 1 and 2 out of Examples 3 and 4.
- the second sensory test was performed on eight inspectors by the paired comparison method (no order effect). In this paired comparison method, one point was scored within a range of ⁇ 3 points for how many points were better or worse than the other.
- the presence or absence of a statistically significant difference in wobbling feeling between each sheet pad is determined by the following method based on the score. That is, after calculating the total score Xi of all the inspectors for each sheet pad, the average preference degree ⁇ i is calculated by the following equation (1) based on the total score Xi. When the average preference degree ⁇ i is divided by the yardstick Y calculated by the following equation (2) and there is a difference of 1.0 or more, it is determined that there is a statistically significant difference between the seat pads. Is done.
- N represents the number of inspectors
- t represents the number of samples
- ⁇ represents an error
- q represents a studentized range.
- the third sensory test for comparing the cushioning property of the seat pad of Example 3 and the cushioning property of the seat pads of Comparative Examples 1 and 2 is the same as the second sensory test related to the wobble feeling. Went to.
- FIG. 3 The graph of the result of the 2nd sensory test which concerns on a wobble feeling is shown in FIG. 3, and the graph of the result of the 3rd sensory test which concerns on cushioning properties is shown in FIG. Note that the horizontal axis of the graph shown in FIG. 3 represents a score of wobbling feeling, and the horizontal axis of the graph shown in FIG. 4 represents a score of cushioning properties. , Indicating a high score.
- the second and second sensory tests for comparing the feeling of wobble and cushioning in each seat pad with each other are also described. It carried out similarly to the sensory test of 3.
- the graph of the result of the 4th sensory test which concerns on a wobble feeling is shown in FIG. 5, and the graph of a result is shown in the 5th sensory test which concerns on cushioning property in FIG.
- the horizontal axis of the graph shown in FIG. 5 represents a score of wobbling feeling (stability)
- the horizontal axis of the graph shown in FIG. 6 represents a score of cushioning property (cushion feeling), both of which are in the center of the horizontal axis. The higher the score is, the higher the score is.
- Example 3 shows the best balance between the suppression of wobbling feeling and the securing of cushioning properties
- Example 4 shows the next best result.
- Example 3 and Example 7 the evaluation of wobble feeling is higher in Example 3, and in Example 4 and Example 6, the evaluation of wobble feeling is higher in Example 4. As a result, it was confirmed that the feeling of wobbling can be effectively suppressed when the first layer is disposed on the seating surface side of the seat pad with respect to the second layer.
- the foam c and the foam d were formed by foaming the resin material of the mixing
- Polyether polyol C average molecular weight 5000, number of functional groups 3, EO 16 mol% Polyether polyol D: average molecular weight 7,500, functional group number 3, EO 13 mol% Polymer polyol: average molecular weight 5000, number of functional groups 3, EO 15 mol% Crosslinking agent A: average molecular weight 400, number of functional groups 4, EO 100 mol% Crosslinking agent B: average molecular weight 750, functional group number 6, EO 23 mol%, PO 77 mol% Catalyst: Triethylenediamine (manufactured by Tosoh Corporation) Silicone foam stabilizer: SZ1325 (manufactured by Dow Corning Toray)
- the sheet pads of Examples 8 to 12 and Comparative Examples 3 and 4 were prepared using the foam c (first foam) and the foam d (second foam). .
- Each of the sheet pads of Examples 8 to 12 is formed by laminating a first layer made of foam c (first foam) and a second layer made of foam d (second foam).
- the sheet pad of Comparative Example 3 has a single-layer structure composed of a first layer made of foam c (first foam).
- the sheet pad of Comparative Example 4 has a single-layer structure composed of a second layer made of foam d (second foam).
- the thickness (mm) of the first layer and the second layer in each sheet pad is shown in Table 8 below.
- each of the seat pads of Examples 8 to 12 and Comparative Examples 3 and 4 was formed so that the first layer was positioned on the seating surface side.
- the 4th which consists of a 3rd test piece which consists of a foam c (1st foam) and a foam d (2nd foam) which makes the square shape whose length of one side is 400 mm in top view.
- Test specimens were formed with varying thickness.
- the anchor F hardness (°), hysteresis loss (%), rebound resilience (%), and tan ⁇ with respect to vibration at 1 Hz in the thicknesses of the third test piece and the fourth test piece are as follows. It has become.
- the rebound resilience is a measurement of the core layer excluding the skin layer.
- any of the third test piece and the fourth test piece when the thickness was 10 mm, F hardness and hysteresis loss could not be measured accurately. This is because the third test piece and the fourth test piece are so thin that they are bottomed out during the measurement and a load is generated. Further, in both the third test piece and the fourth test piece, when the thickness was 10 mm, tan ⁇ with respect to vibration of 1 Hz could not be measured accurately. This is because the thickness of the third test piece and the fourth test piece is very thin, and the compression rate is greatly affected by a slight difference in the compression amount.
- the foam c is used as the first layer and the foam d is used as the second layer, the cushioning at the time of sitting is ensured while suppressing the wobble feeling felt by the passenger due to the deformation of the seat pad. Can be made easier.
- the seat pad according to the present invention it is possible to easily secure the cushioning property (cushion feeling) at the time of sitting while suppressing the wobbling feeling felt by the occupant due to deformation (that is, ensuring the occupant's stability). it can.
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- Aviation & Aerospace Engineering (AREA)
- Transportation (AREA)
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- Mattresses And Other Support Structures For Chairs And Beds (AREA)
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Abstract
Description
本願は、2011年10月14日に、日本に出願された特願2011-226759号に基づき優先権を主張し、その内容をここに援用する。
この種のシート用パッドでは、車両が緩いカーブを走行したり、走行中に車線変更したりして、装着されたシート用パッドに1Hz前後の低周波数帯の振動が入力されることがある。この場合、シート用パッドが変形することで、乗員が、横滑りや車両のロール軸回りの横揺れ等のぐらつき感を感じることがあった。特に、薄肉のシート用パッドにおいては、たわみ量、ばね感、底付き感等の観点から、一般にクッション性(反発)の高い材質が採用されるため、座面の安定性が損なわれてぐらつき感が感じられ易くなる。
本発明に係るシート用パッドは、車両に取り付けられ着座部として用いられるシート用パッドであって、互いに積層される、第1発泡体からなる第1層と、第2発泡体からなる第2層と、を備え、前記第1発泡体は、前記第2発泡体よりも、アスカーF硬度およびヒステリシスロスのうちの少なくとも一方が大きく、前記第2発泡体は、前記第1発泡体よりも、反発弾性率が大きい。
すなわち、第1発泡体のアスカーF硬度が、第2発泡体のアスカーF硬度よりも大きい場合、低周波数帯の振動が入力されたときにおける第1層の変形を抑制することができる。これにより、乗員がぐらつき感を感じるようなシート用パッドの変形を抑制することが可能になり、変形により乗員が感じるぐらつき感を抑えることができる。
また、第1発泡体のヒステリシスロスが、第2発泡体のヒステリシスロスよりも大きい場合、第1層に、低周波数帯の振動に対する高い減衰性を具備させることができる。これにより、乗員がぐらつき感を感じるようなシート用パッドの変形を減衰することが可能になり、変形により乗員が感じるぐらつき感を抑えることができる。
そして第1層が、第2層に対して着座面側に配置されており、シート用パッドにおいて着座面側に位置する部分が第1層により構成されることとなるので、この部分の変形を抑制することができる。これにより、例えば、シート用パッドにおいて着座面とは反対側に位置する部分の変形が抑制されている場合に比べて、変形により乗員が感じるぐらつき感を効果的に抑えることができる。
図1に示すように、シート用パッド10は、図示しない車両に取り付けられ着座部として用いられる。なお図示の例では、シート用パッド10の厚さは、例えば70mm以下、好ましくは60mm以下30mm以上とされ、シート用パッド10は、薄肉に形成されている。またシート用パッド10は、乗員が着座した状態で例えば約30%程度圧縮される。
ここで、第1試験片および第2試験片をそれぞれ、上面視において一辺の長さが400mmの正方形状をなし、厚さが60mmとなるよう形成すると、第1試験片のアスカーF硬度は、例えば約55°以上80°未満程度となっている。また、第2試験片のアスカーF硬度は、例えば約40°以上65°未満程度となっている。
なお、第1試験片および第2試験片それぞれの25%硬度は、互いに同等となっている。
さらに、第1試験片の反発弾性率は、例えば約50%以上65%未満程度とされ、第2試験片の反発弾性率は、例えば約65%以上80%未満程度となっている。
さらにまた、第1試験片の1Hzの振動に対するtanδは、例えば約0.13以上0.28未満程度とされ、第2試験片の1Hzの振動に対するtanδは、例えば約0.10以上0.16未満程度となっている。
また1Hzの振動に対するtanδは、例えば以下の方法で測定される。
まず、水平台を有する動ばね試験機と、水平台上に載置された試験片を上方から加圧する加圧板(例えば、φ200の円板状)と、を準備する。水平台には、試験片の空気を逃がす逃がし穴(例えば、直径6mm程度)を、互いに同等の間隔(例えば、中心間距離19mm程度)をあけて複数形成する。そして、試験片を加圧板により加圧し、例えば30%程度、圧縮させた状態で、周波数が1Hzでかつ振幅が例えば±2.5mmの振動を上下方向に加え、1Hzの振動に対するtanδを測定する。
例えば、前記実施形態では、第1樹脂材料のポリオール成分として、分子量が異なる2種類のPPGを混合したものを採用するものとしたが、これに限られない。
また前記実施形態では、第1層11が、第2層12に対して、シート用パッド10の着座面側に配置されているものとしたが、第2層12が、第1層11に対して、着座面側に配置されているもよい。
なお、第1発泡体AのアスカーF硬度が、第2発泡体BのアスカーF硬度よりも大きく、かつ第1発泡体Aのヒステリシスロスが、第2発泡体Bのヒステリシスロスよりも小さい場合には、第1試験片のアスカーF硬度が、第2試験片のアスカーF硬度よりも大きくなり、かつ第1試験片のヒステリシスロスが、第2試験片のヒステリシスロスよりも小さくなるように、第1試験片のアスカーF硬度およびヒステリシスロス、並びに第2試験片のアスカーF硬度およびヒステリシスロスをそれぞれ、前述した数値範囲内で設定してもよい。
また、第1発泡体AのアスカーF硬度が、第2発泡体BのアスカーF硬度よりも小さく、かつ第1発泡体Aのヒステリシスロスが、第2発泡体Bのヒステリシスロスよりも大きい場合には、第1試験片のアスカーF硬度が、第2試験片のアスカーF硬度よりも小さくなり、かつ第1試験片のヒステリシスロスが、第2試験片のヒステリシスロスよりも大きくなるように、第1試験片のアスカーF硬度およびヒステリシスロス、並びに第2試験片のアスカーF硬度およびヒステリシスロスをそれぞれ、前述した数値範囲内で設定してもよい。
さらに本発明は、前記実施形態のように、厚さが70mm以下の薄肉のシート用パッド10に好適に適用することも可能であるが、例えば厚さが70mm以上のシート用パッド10に適用してもよい。
金型による成形品の場合、表面に密度の高いスキン層が形成されるため、通気性が低下することで着座や車両走行による振動等の外部入力に対する吸収性(すなわち、振動吸収性)が良好となる。一方、スラブ品の場合、密度分布が少ないため、着座時などにシート用パッドが圧縮されても、シート用パッドに均一に圧がかかり、永久ひずみが生じにくいとのメリットがある。
<第1の検証実験>
下記表1に示す配合の樹脂材料をそれぞれ発泡することで発泡体aおよび発泡体bを形成し、それぞれ第1発泡体および第2発泡体として用いた。
ポリエーテルポリオールA:平均分子量7500、官能基数3、EO13mol%、PO87mol%
ポリエーテルポリオールB:平均分子量700、官能基数3、PO100mol%
ポリマーポリオール:平均分子量5000、官能基数3、EO15mol%、PO85mol%
架橋剤:平均分子量400、官能基数4、EO100mol%
触媒:トリエチレンジアミン(東ソー社製)
シリコーン整泡剤:SZ1325(東レ・ダウコーニング社製)
結果を表5に示す。
そして、実施例1~5のうち、特に実施例3および4でぐらつき感およびクッション性の評価がいずれも高いことが確認された。
さらに、実施例3と、比較例1および2と、のクッション性について有意差検定を行ったところ、実施例3のクッション性と比較例2のクッション性との間には、有意差が無く、実施例3のクッション性と比較例1のクッション性との間には、有意差があることが確認された。
以上より、実施例3では、変形により乗員が感じるぐらつき感が効果的に抑えられつつ、着座時のクッション性が良好に確保されていることが確認された。
また、各実施例1、3、4、5のクッション性について相互に有意差検定を行ったところ、実施例5のぐらつき感とその他の実施例との間には有意差があり、実施例1、3、4の各実施例の間には有意差がないことが確認された。
以上より、ぐらつき感の抑制と、クッション性の確保の双方が最もバランスよく発揮されているのは実施例3であり、次に良好なのは実施例4であることが分かる。
結果を表6に示す。表内の数値は、順位を表す。
また、下記表7に示す配合の樹脂材料をそれぞれ発泡することで発泡体cおよび発泡体dを形成し、それぞれ第1発泡体および第2発泡体として用いた。
ポリエーテルポリオールC:平均分子量5000、官能基数3、EO16mol%
ポリエーテルポリオールD:平均分子量7500、官能基数3、EO13mol%
ポリマーポリオール:平均分子量5000、官能基数3、EO15mol%
架橋剤A:平均分子量400、官能基数4、EO100mol%
架橋剤B:平均分子量750、官能基数6、EO23mol%、PO77mol%
触媒:トリエチレンジアミン(東ソー社製)
シリコーン整泡剤:SZ1325(東レ・ダウコーニング社製)
そして、実施例8~12のうち、特に実施例10および11でぐらつき感およびクッション性の評価がいずれも高いことが確認された。
11 第1層
12 第2層
A 第1発泡体
B 第2発泡体
Claims (7)
- 車両に取り付けられ着座部として用いられるシート用パッドであって、
互いに積層される、第1発泡体からなる第1層と、第2発泡体からなる第2層と、を備え、
前記第1発泡体は、前記第2発泡体よりも、アスカーF硬度およびヒステリシスロスのうちの少なくとも一方が大きく、
前記第2発泡体は、前記第1発泡体よりも、反発弾性率が大きいシート用パッド。 - 前記第1発泡体は、前記第2発泡体よりも、ヒステリシスロスが大きい請求項1に記載のシート用パッド。
- 前記第1層が上層側に配置される請求項1に記載のシート用パッド。
- 前記第2層が下層側に配置される請求項1に記載のシート用パッド。
- 前記第1層の厚みが、前記第1層および前記第2層の全体の厚みに対して、30%~50%である請求項3に記載のシート用パッド。
- 前記第1層の厚みが、前記第1層および前記第2層の全体の厚みに対して、30%~50%である請求項4に記載のシート用パッド。
- 前記第1層および前記第2層の全体の厚みが70mm以下である請求項1に記載のシート用パッド。
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EP12840091.8A EP2767190B1 (en) | 2011-10-14 | 2012-10-12 | Seat pad |
US14/351,020 US9221369B2 (en) | 2011-10-14 | 2012-10-12 | Seat pad |
JP2013538593A JP5789671B2 (ja) | 2011-10-14 | 2012-10-12 | シート用パッド |
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EP (1) | EP2767190B1 (ja) |
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2016106831A (ja) * | 2014-12-05 | 2016-06-20 | 株式会社東洋シート | クッション体 |
JP2022040772A (ja) * | 2020-08-31 | 2022-03-11 | 東海興業株式会社 | クッション材とそれを備える車両用シート |
JP7502937B2 (ja) | 2020-08-31 | 2024-06-19 | 東海興業株式会社 | クッション材とそれを備える車両用シート |
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US10780803B2 (en) * | 2016-11-17 | 2020-09-22 | Fox Factory, Inc. | Adjustable suspended seat apparatus having tuned frequency-tailored damping through a stratified seat structure |
CN107057023A (zh) * | 2017-05-05 | 2017-08-18 | 温州市宏日海棉制造有限公司 | 一种环保型海绵及其生产工艺 |
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JPH0619604U (ja) * | 1992-08-25 | 1994-03-15 | アキレス株式会社 | シートクッション構造 |
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JP2005237483A (ja) * | 2004-02-24 | 2005-09-08 | Tokai Kogyo Co Ltd | 乗物シート用のクッション体 |
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US7661764B2 (en) | 2006-08-30 | 2010-02-16 | Lear Corporation | Vehicle seat assembly having a hardness gradient via “A” surface intrusions and/or protrusions |
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JP5387174B2 (ja) | 2009-06-30 | 2014-01-15 | トヨタ紡織株式会社 | 車両用シート |
WO2011102449A1 (ja) | 2010-02-19 | 2011-08-25 | 株式会社イノアックコーポレーション | クッションパッド及びその製造方法 |
CN102178410B (zh) | 2010-09-27 | 2012-10-24 | 博洛尼家居用品(北京)股份有限公司 | 具有舒适结构的沙发 |
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2012
- 2012-10-12 JP JP2013538593A patent/JP5789671B2/ja not_active Expired - Fee Related
- 2012-10-12 US US14/351,020 patent/US9221369B2/en active Active
- 2012-10-12 WO PCT/JP2012/076463 patent/WO2013054893A1/ja active Application Filing
- 2012-10-12 CN CN201280050087.2A patent/CN103889278B/zh not_active Expired - Fee Related
- 2012-10-12 EP EP12840091.8A patent/EP2767190B1/en not_active Not-in-force
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JPH0619604U (ja) * | 1992-08-25 | 1994-03-15 | アキレス株式会社 | シートクッション構造 |
JP2002052616A (ja) | 2000-08-10 | 2002-02-19 | Bridgestone Corp | 車両用シート |
JP2005237483A (ja) * | 2004-02-24 | 2005-09-08 | Tokai Kogyo Co Ltd | 乗物シート用のクッション体 |
JP2007014427A (ja) * | 2005-07-05 | 2007-01-25 | Nissan Motor Co Ltd | 高分子ゲルを用いた疲労低減シート |
Cited By (3)
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JP2016106831A (ja) * | 2014-12-05 | 2016-06-20 | 株式会社東洋シート | クッション体 |
JP2022040772A (ja) * | 2020-08-31 | 2022-03-11 | 東海興業株式会社 | クッション材とそれを備える車両用シート |
JP7502937B2 (ja) | 2020-08-31 | 2024-06-19 | 東海興業株式会社 | クッション材とそれを備える車両用シート |
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CN103889278A (zh) | 2014-06-25 |
EP2767190A4 (en) | 2015-05-27 |
JP5789671B2 (ja) | 2015-10-07 |
EP2767190A1 (en) | 2014-08-20 |
US9221369B2 (en) | 2015-12-29 |
JPWO2013054893A1 (ja) | 2015-03-30 |
US20140252838A1 (en) | 2014-09-11 |
EP2767190B1 (en) | 2019-06-12 |
CN103889278B (zh) | 2017-08-08 |
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