JP2012171360A - Breathable seat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To sufficiently prevent damp and acquire a sufficient cushion performance.SOLUTION: A three-dimensional net cushion body formed by a fiber material is arranged to a seat backrest part so as to provide a seat improved in damp feeling and cushion performance.

Description

  The present invention relates to a breathable sheet used for a seat, a chair or the like that is mounted on a vehicle such as a vehicle, a ship, or an aircraft.

Conventionally, a breathable sheet in which a fiber cushion is integrally formed with urethane foam resin is known (see, for example, Patent Document 1 and Patent Document 2).
However, in Patent Document 1, the fiber layer is pushed by the foaming pressure generated when the urethane foam stock solution is injected and molded, and therefore the fiber layer is released from the foaming pressure of the urethane foam when taken out from the mold. Therefore, there is a problem that a predetermined dimension cannot be obtained because of restoration. Further, Patent Document 2 has a problem in that the urethane foam stock solution enters the fiber layer at the stage of foaming, and the boundary becomes very hard, and a predetermined hardness cannot be obtained because sufficient foaming pressure cannot be obtained. There was a problem that it was insufficient as a cushion body.

  In addition, by adopting a composite structure of fiber elastic body and urethane foam, the density variation of the fiber elastic body is reduced and the heat molding time is shortened. A sheet main pad that improves hardness characteristics is described (see, for example, Patent Document 3). That is, it consists of a front pad layer made of a fiber elastic body and a back pad layer made of urethane foam provided on the back side of the front pad layer, and the front pad layer is formed with a substantially constant thickness. is there. Although there is a description about the anti-steaming effect due to the use of the fiber elastic body, the anti-steaming effect was not sufficient in the configuration of the present invention.

  In consideration of air permeability, a structure in which a fiber elastic body is installed on the entire seat surface has been proposed. In this method, since the seating surface in contact with the human body is different from the urethane pad conventionally used, the user feels uncomfortable in the sitting comfort. In addition, since the fiber elastic body has a higher cost than urethane, there is a problem that the cost increases when used over the entire surface of the seating portion. Furthermore, in order to reduce the feeling of stuffiness, it has been disclosed to make a vent hole in the entire seating surface, but there is a possibility that strength and sitting comfort may be lowered by making a hole in the entire seating surface. For this reason, the opening area was not widened, and the effect of reducing stuffiness was insufficient. (For example, Patent Document 4)

JP-A-1-110914 Japanese Utility Model Publication No. 1-104247 Japanese Patent Laid-Open No. 10-248685 JP 2004-73429 A

  Conventionally, there has not been provided a breathable sheet that is excellent in moldability and has a sufficient feeling of dampness without feeling uncomfortable in cushioning properties.

  The present invention relates to a breathable sheet in which a three-dimensional reticulated cushion formed of a fiber material is mainly disposed on the back surface of the sheet.

  ADVANTAGE OF THE INVENTION According to this invention, the air permeable sheet which was excellent in the moldability which was inadequate in the past, and can fully prevent cushioning discomfort and a feeling of stuffiness can be provided.

It is a general-view figure of a car seat. It is A1-A2 sectional drawing of FIG. It is B1-B2 sectional drawing of FIG. It is a schematic diagram of a seat back and seat waist. 3 is a schematic diagram of a backrest portion of Example 1. FIG. It is A3-A4 sectional drawing of FIG. It is B3-B4 sectional drawing of FIG. FIG. 6 is a schematic diagram of a backrest part of Example 2. It is A5-A6 sectional drawing of FIG. It is B5-B6 sectional drawing of FIG. FIG. 6 is a schematic diagram of a backrest part of Example 3. It is A7-A8 sectional drawing of FIG. It is B7-B8 sectional drawing of FIG. FIG. 6 is a schematic diagram of a backrest part of Example 4. It is A9-A10 sectional drawing of FIG. It is B9-B10 sectional drawing of FIG.

Hereinafter, the present invention will be described in detail. The present invention relates to 1. A breathable sheet characterized in that a three-dimensional net-like cushion body formed of a fiber material is disposed on a backrest portion of the sheet;
2. On the occupant side of the seat back part, a three-dimensional net-like cushion body formed of fiber material is disposed, and a breathable sheet characterized in that urethane is disposed on the occupant side,
3. 3. The breathable sheet as described in 2 above, wherein the urethane has ventilation holes.
4). 4. The breathable sheet according to any one of the above items 2 and 3, wherein the three-dimensional reticulated cushion body of the backrest portion of the seat exists only on the back portion.

  By placing a three-dimensional net-like cushion body made of a fiber material on the backrest portion of the seat, the feeling of stuffiness can be reduced. Furthermore, it is possible to reduce unpleasant vibrations that are difficult to remove with conventional products. Furthermore, the seating feeling is soft, and it has the merit that it is hard to get tired even during long driving.

Specifically, it has been found that by placing a three-dimensional reticulated cushion body formed of a fiber material on the backrest portion, sufficient comfort can be obtained by reducing the feeling of stuffiness. This three-dimensional reticulated cushion body has a fiber diameter of 0.1 to 1.5 mm made of a thermoplastic resin, preferably a large number of continuous linear bodies having a fiber diameter of 0.2 to 1.0 mm, each winding in a loop shape, And it is comprised with the three-dimensional network-like structure body which mutually fused the contact part. For example, the thermoplastic resin includes a thermoplastic elastomer resin including a thermoplastic polyester elastomer and a thermoplastic polyurethane elastomer.
The thickness of the three-dimensional mesh cushion body is preferably 10 mm or more. More preferably, it is 15 mm or more, More preferably, it is 20 mm or more. If the thickness is small, a sufficient damp feeling reduction effect cannot be obtained, which is not preferable. A thicker thickness is preferable for reducing stuffiness, but if it exceeds 150 mm as a vehicle seat, it becomes difficult to handle, so 150 mm or less is preferable.

The density of the three-dimensional net-like cushioning ^{body, 20kg / m 3 ~200kg / m} 3 is preferred. Preferably it is 30 kg / m ³ , more preferably 40 kg / m ³ . When the density is less than 20 kg / m ³ , it is difficult to maintain a minimum form as a three-dimensional reticulated cushion body, and use as a vehicle seat becomes difficult. When the density exceeds 200 kg / m ³ , the weight becomes too heavy, and at the same time, the cushioning property tends to be deteriorated, which is not preferable for practical use.

The air permeability of the three-dimensional reticulated cushion body is preferably set to 400 cc / cm ² / sec or more. By having this air permeability, a sufficient damp feeling reduction effect can be obtained. If it is the preferable density range of this invention, since air permeability will be 400 cc / cm < ² > / sec or more, it is preferable. The upper limit of the air permeability does not need to be specified in particular, and it is sufficient if it has a density as a three-dimensional mesh cushion body.

  If only the feeling of stuffiness is improved, it can be solved by using a three-dimensional network for the entire backrest part. However, since there is a problem in moldability, mass production is difficult. In the present invention, on the side opposite the occupant side of the backrest portion, it is formed using urethane that is easy to mold, and a three-dimensional network is disposed on the occupant side (the part where the person's back contacts), thereby reducing stuffiness and mass production. It has been found that compatibility of sex can be achieved.

  The urethane pad used in the present invention may be any conventionally known urethane pad, but it is preferable to use a urethane pad used in a general vehicle seat. By using such a urethane pad, it becomes possible to maintain not only cushioning properties but also important performances in actual use such as durability and flame retardancy.

  There is no particular limitation on the method of arranging the three-dimensional network and the backrest of urethane. A three-dimensional network and urethane may be laminated on the entire backrest portion, or a structure in which a knitted body is disposed only on a portion to which an occupant's load is applied while forming the backrest portion with urethane. Moreover, it is good also as a structure which provides a vent hole in a part of urethane and releases the sweat and heat which arise from a passenger | crew.

  The thickness ratio in the back portion of the net-like body and urethane is preferably 1: 9 to 9: 1. If both 10% of the net state and urethane are present, the respective functions are exhibited.

  There are no particular restrictions on the method of joining the net-like body and urethane, but a method of joining using an adhesive, a method of attaching using an adhesive sheet, and physically wrapping the knitted body and urethane with a skin agent. The method of fixing is mentioned. The adhesive may be water based, solvent based or hot melt based.

When the three-dimensional mesh cushion body is disposed in the urethane pad as the sheet of the present invention, it is preferable that a vent hole communicating with the three-dimensional mesh cushion body formed in the urethane pad exists. This vent is a preferable configuration for reducing the feeling of stuffiness. The total cross-sectional area of the vents is preferably greater than 100 cm ² , more preferably 200 cm ^{2 and} even more preferably 400 cm ² . If the total cross-sectional area is less than 100 mm ² , the effect of reducing stuffiness is reduced, which is not preferable. An upper limit is not necessary for the effect of reducing the stuffiness, but if the hole is opened too much, it becomes difficult to maintain the actual sheet shape, so the upper limit is 1000 cm ² . These holes are preferably arranged in the vicinity of the lower thigh in order to communicate with the three-dimensional net-like cushion body, and there is no particular problem as long as the strength of the sheet itself is maintained even if the size of the holes is increased.

  Although a three-dimensional network body may be arranged on the entire backrest portion, an effect of reducing stuffiness can be achieved by arranging the network body at a specific part of the back. Here, when the occupant sits on the backrest part, the side from the side where the occupant's head is located (upper side) to 2/3 of the longitudinal length of the backrest part is called the back part, and the other part is called the waist part. In particular, it has been found that by arranging the knitted body up to 2/3 of the full length in the longitudinal direction, both the moldability and the effect of reducing stuffiness are achieved.

In a breathable sheet using a three-dimensional mesh cushion body, a skin material as a seat cover may be used. Conventionally known materials such as leather and fabric are used as the skin material. In the present invention, a higher air permeability is preferable, and a seat cover of 3 cc / cm ² / sec or more, preferably 10 cc / cm ² / sec or more, more preferably 30 cc / cm ² / sec is preferable. No particular limitation is imposed on the upper limit of the air permeability, 500cc ^/ cm 2 ^/ sec to insufficient strength as a skin material exceeds 500cc ^/ cm 2 ^/ sec is preferred.

  The present invention will be described in more detail with reference to the following examples. However, the present invention is not limited to the following examples, and may be appropriately modified and implemented within a range that can be adapted to the resins described above and below. All of which are within the scope of the present invention. The measurement methods used in the examples are as follows.

Ventilation hole total area (cm ² )
The calculation was performed based on the sum of the cross-sectional areas of the air holes communicated with the three-dimensional reticulated cushion body formed in the urethane pad.

Sensation of back in monitor test Ten monitors were evaluated for the feeling of stuffiness on the back after sitting on the seat for 30 minutes. By combining the evaluation results of 10 monitors, “◎” indicates a very comfortable feeling without any stuffiness, “○” indicates a comfortable feeling with little stuffiness, and “○” indicates a feeling of stuffiness. “×”.

Lumbar sensation by monitor test Ten monitors were evaluated for the feeling of stuffiness felt on the lumbar region after sitting on the seat for 30 minutes. By combining the evaluation results of 10 monitors, “◎” indicates a very comfortable feeling without any stuffiness, “○” indicates a comfortable feeling with little stuffiness, and “○” indicates a feeling of stuffiness. “×”.

Back cushion feeling Ten monitors were evaluated for the cushion feeling felt on the back after sitting on the seat for 30 minutes. Based on the evaluation results of 10 monitors, “◎” indicates that the cushion is superior, “×” indicates that the cushion is inferior, and “◯” indicates that the cushion is not superior or inferior.

Cushion Feeling on the Lumbar Ten monitors were asked to evaluate the cushion feeling felt on the lumbar area after sitting on the seat for 30 minutes. Based on the evaluation results of 10 monitors, “◎” indicates that the cushion is superior, “×” indicates that the cushion is inferior, and “◯” indicates that the cushion is not superior or inferior.

Air permeability JIS L1096 (2010) 8.26.1 Measured by A method (Fragile method). Specifically, after a test piece cut into 200 mm × 200 mm is attached to one end of a cylinder of a Frazier type tester, a suction fan and an air hole are provided so that an inclination type barometer shows a pressure of 125 Pa by an adjusting resistor. It was adjusted. The pressure indicated by the vertical barometer at this time was measured, and the amount of air passing through the test piece was determined from the measured pressure and the air hole used of 11.8 mm using a conversion table attached to the testing machine. The test was performed 5 times for different test pieces, and the average value was obtained.

Thickness and apparent density of three-dimensional reticulated cushion body A sample was cut into a size of 15 cm × 15 cm, left unloaded at a temperature of 20 ° C. and a humidity of 65% RH for 24 hours, and the heights of four locations were measured. The value was taken as thickness.
Further, the mass of the sample after being left for 24 hours was measured, and the value obtained by dividing the mass by the sample volume obtained from the sample area (= 0.0225 m ² ) × thickness was defined as the apparent density.

Fiber diameter of three-dimensional reticulated cushion body A sample is cut into a size of 20 cm × 20 cm, and linear bodies are collected from 10 locations. The fiber diameter was measured from a photograph in which the cross section of the linear body collected at 10 locations was magnified 30 times with a microscope to obtain the fiber diameter of the three-dimensional reticulated cushion body. (Average value of n = 10)

Base material (urethane pad)
Polyurethane type polyurethane used in general vehicle seats was foamed in a metal mold and molded into a seat seating part shape.

Base material (three-dimensional reticulated cushion body)
Polyether ester elastomer with a melting point of 200 ° C is melted and discharged at 240 ° C from a nozzle (nozzle hole diameter 1mm, single hole discharge rate 1.4g / min · hole), and cooled so that the water surface is 250mm below the nozzle surface. Distribute water and place a stainless steel endless net with a width of 60 cm in parallel with a distance of 4 cm between the pair of take-up conveyors so that they partly come out on the water surface. While being drawn into solid cooling water at room temperature at a speed of 1.1 m / minute, the solid mesh cushion was obtained by cutting into a predetermined size. Thereafter, the obtained three-dimensional reticulated cushion body was heated at 105 ° C. for 15 minutes and subjected to pseudo crystallization treatment. The obtained three-dimensional reticulated cushion body had a fiber diameter of 0.62 mm, an apparent density of 40 kg / m ³ , and a thickness of 40 mm. When using a three-dimensional net-like cushion body thicker than 40 mm in the examples and comparative examples, the three-dimensional net-like bodies cut to the required thickness were stacked by adhesion to obtain a predetermined thickness.

Example 1
A solid reticulated cushion body having a length of 600 mm, a width of 300 mm, and a thickness of 70 mm was installed on the entire backrest. For the evaluation, a seat covered with a fabric skin material having an air permeability of 30 cc / cm ² / sec was used by installing a backrest portion prepared on a car seat frame.

Example 2
Create urethane 600mm long x 300mm wide x 30mm thick, used for the entire backrest, layer the separately created net, 600mm long x 300mm wide x 40mm thick, and touch the back of the net to the occupant's back (Hereinafter referred to as the occupant side).
The laminated product was covered with a fabric skin material similar to that of Example 1 to form a sheet.

Example 3
The sheet of Example 2 was used, and 32 communication holes having a diameter of 4 cm were formed in the mesh body on the urethane side, and the total area of the communication holes was 400 cm ² .

Example 4
A urethane having a length of 600 mm, a width of 300 mm, and a thickness of 70 mm was formed on the entire backrest. A recess having a length of 300 mm, a width of 200 mm, and a thickness of 40 mm was formed from the urethane occupant side, and 16 communication holes having a diameter of 2 cm were formed in the recess. The total area of the communication holes was 200 cm ² . A mesh body having the same dimensions as the concave portion was fitted into the concave portion to create a backrest portion. The vertical position of the mesh is 50 mm when the upper end on the side where the head is located is 0 mm in the vertical direction of the backrest and the lower end on the side where the buttock is positioned is 600 mm in the vertical direction of the backrest. The horizontal position of the mesh was 50 mm inside from both ends of the backrest. For the evaluation, a seat covered with a fabric skin material having an air permeability of 30 cc / cm ² / sec was used by installing a backrest portion prepared on a car seat frame.

Comparative Example 1
Urethane having a length of 600 mm × width of 300 mm × thickness of 70 mm was disposed on the entire backrest. For the evaluation, a seat covered with a skin material of a fabric similar to that of Example 1 was used by placing the backrest portion created on the car seat frame.

Since the back has a high sensitivity to the sensation of feeling, Example 1 formed only by a highly air-permeable mesh body, and Examples 3 and 4 in which a highly air-permeable network body is disposed on urethane having communication holes are completely used. It was very comfortable without feeling tingling. Further, even in the case where there was no communication hole in the urethane, in Example 2 in which a net-like body having high air permeability was laminated, the effect of reducing the sensation was seen, and there was almost no sensation of sensation. However, Comparative Example 1 composed of only urethane with low air permeability without communication holes felt uncomfortable and uncomfortable.

Even in the waist, Example 1 formed only with a highly air-permeable mesh body and Example 3 in which a highly air-permeable network body is disposed on urethane having communication holes are very comfortable without feeling any swaying. Met. Even in Example 2 in which a highly breathable network was laminated on urethane having no communication holes, the feeling of peeling was hardly felt and the feeling was comfortable. In addition, since the sensitivity of the sensation of the waist is low, Example 4 and Comparative Example 1 in which only urethane is disposed on the lumbar region were comfortable with almost no sensation of sensation.

In the back part, in Examples 1-4 in which a net-like body is arranged on the back part, the touch feeling at the initial stage of the seating is softer than that of Comparative Example 1 in which urethane is arranged on the back part, and the cushion feeling is excellent. In Comparative Example 1 in which urethane is arranged on the back, although the touch feeling at the initial stage of sitting is hard, the back has a low cushioning sensitivity, so the cushioning feeling is excellent and not inferior.

In the waist part, the cushion feeling was excellent in Example 4 and Comparative Example 1 in which urethane was disposed in the waist part. Moreover, since the waist part has high cushioning sensitivity, Examples 1 to 3 in which a net-like body is disposed on the waist part felt somewhat uncomfortable, so the cushioning feeling was excellent and not inferior.

  The breathable sheet of the present invention is a sheet that is used for a seat, a chair, or the like that is mounted on a vehicle such as a vehicle, a ship, or an aircraft, and has achieved a reduction in stuffiness.

1: Seat back portion 2: Seat back portion 3: Seat waist portion 4: Mesh body 5: Urethane 6: Communication hole

Claims (4)

  A breathable sheet characterized in that a three-dimensional reticulated cushion body formed of a fiber material is disposed on a backrest portion of the sheet.   A breathable sheet characterized in that a three-dimensional mesh cushion formed of fiber material is disposed on the occupant side of the seat back and urethane is disposed on the side opposite to the occupant.   The breathable sheet according to claim 2, wherein urethane has ventilation holes.   The breathable sheet according to any one of claims 2 and 3, wherein the three-dimensional reticulated cushion body of the backrest part of the seat exists only in the back part.