JP2010187996A - Seat pad - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a seat pad which is made lighter in weight without degrading sitting performance, such as a feeling of a foreign body or holding property to be received by the sitting person of a seat, and molding property, and does not occur abnormal noise caused by a sliding contact between a bead foam molding and a seat frame, etc. <P>SOLUTION: The seat pad includes: a seat pad body made of a flexible foam resin; the bead foam molding integrally arranged on the rear surface of the seat pad body; and a supporter material for covering at least a part of the rear surface of the seat pad body and at least a part of the bead foam molding. The bead foam molding is arranged at a position such that a distance between the surface of the bead foam molding facing the front surface of the seat pad body and the front surface of the seat pad body is 15-25 mm. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a seat pad suitable as a vehicle seat pad, and in particular, a seat pad body made of a soft foam resin, a bead foam molded body integrally disposed on the back side of the seat pad body, and a seat pad body. The present invention relates to a seat pad provided with a supporter material that covers at least a part of the back surface side and at least a part of a bead foam molded body.

  A seat pad used for an automobile or the like is usually made of a soft foam resin. However, Patent Document 1 discloses a bead foam that is lighter than the soft foam resin on the back surface of the side support portion of the seat pad body made of the soft foam resin. A seat pad fitted with a molded body is described. Patent Document 2 describes a seat pad in which a bead foam molded body is held as an insert material inside a mold and a soft foam resin is foam-molded.

  Since the bead foam molded body described in Patent Documents 1 and 2 is lighter than a soft foam resin, the bead foam occupies the seat pad in order to reduce the weight of the vehicle for the purpose of improving the fuel consumption of automobiles and the like. The weight of the seat is reduced by increasing the proportion of the molded body.

  In addition, since the bead foam molded body is a material harder than the soft foam resin, foreign matter received by the seat occupant depends on how deep the bead foam molded body is disposed from the surface of the seat pad. The seating performance such as feeling and holdability varies greatly. And, when the bead foam molded body is set in a mold and integrally foam-molded with a soft foam resin like the seat pad described in Patent Document 2, in the sheet pad after foam molding, The gap between the surface facing the surface side of the seat pad main body and the surface of the seat pad main body is the liquid flow path of the foamed resin raw material liquid during foam molding, so the size (distance) of the gap is the seat pad It has a great influence on the moldability.

  Here, when trying to increase the weight reduction rate of the seat pad, the ratio of the bead foam molded body to the seat pad increases, the surface of the bead foam molded body facing the surface side of the seat pad main body, and the seat pad main body Although the distance to the surface is reduced and the feeling of foreign matter received by the seat occupant is enhanced, the holdability is improved, while the moldability is lowered. No specific numerical value is described regarding the influence of the distance between the surface facing the surface side of the seat pad main body and the surface of the seat pad main body on the foreign object feeling, holdability and moldability.

  Further, in a seat pad in which a bead foam molded body is fitted to the back surface as in Patent Document 1, the bead foam molded body slides on a seat frame or the like, and abnormal noise is generated. In addition, the bead foam molded body has a problem that abnormal noise due to sliding contact is more likely to occur than a soft foam resin.

  Patent Document 2 shows a cross-sectional view in which a bead foam molded body is surrounded by a soft foam resin, and the bead foam molded body and the seat frame and the like are not in sliding contact with each other. There is no description on how to carry out foam molding of a soft foam resin by holding the inside of the mold.

JP-A-5-57069 Japanese Patent Laid-Open No. 1-249312

  The present invention provides a seat pad main body made of a soft foam resin, a bead foam molded body integrally disposed on the back side of the seat pad main body, at least a part of the back side of the seat pad main body, and the bead foam molded body. A seat pad comprising at least a part of a supporter material, which reduces the weight of the seat pad without deteriorating seating performance and formability such as foreign body feeling and holdability that a seat occupant receives, and bead foam molding An object of the present invention is to provide a seat pad that does not generate abnormal noise due to sliding contact between a body and a seat frame.

  The inventors of the present invention can reduce the weight of the seat pad without deteriorating the seating performance and moldability such as foreign object feeling and holdability received by the seated person, and the bead foam molded body and the seat frame can be directly slid. We have intensively studied the structure of the seat pad that does not touch and does not generate abnormal noise. As a result, the bead foam molded body, which is a material harder than the soft foam resin, is used as the soft foam resin when reducing the weight by increasing the ratio of the bead foam molded body that is lighter than the soft foam resin to the seat pad. The seating performance such as the foreign object feeling and the holdability that the seated person receives is the distance between the depth position to be arranged, that is, the surface of the bead foam molded body facing the surface side of the seat pad body and the surface of the seat pad body. In addition, the present inventors have found that a predetermined range is preferable in order to reduce the weight of the seat pad without reducing the moldability.

The present invention has been further improved based on the above findings, and the gist of the present invention is as follows.
(1) a seat pad body made of a soft foam resin;
A bead foam molded body integrally disposed on the back side of the seat pad body;
A supporter material that covers at least a part of the back side of the seat pad main body and at least a part of the bead foam molded body;
With
The bead foam molded body is disposed at a position where the distance between the surface of the bead foam molded body facing the surface side of the seat pad body and the surface of the seat pad body is 15 to 25 mm. , Seat pad.

(2) The seat pad according to (1) above, wherein the bead foam molding is made of polystyrene foam (EPS) having an apparent density of 10 to 35 kg / m ³ .

(3) The seat pad according to (1) or (2) above, wherein the disposition position of the bead foam molded body is a side support portion of a seat back pad.

  According to the invention of (1) above, the bead foam molded body is disposed at a position where the distance between the surface of the bead foam molded body facing the surface side of the seat pad body and the surface of the seat pad body is 15 to 25 mm. By placing it in a range of positions, the seating performance is improved without increasing the feeling of foreign matter received by the seat occupant and ensuring the liquid flow path of the soft foam resin raw material liquid. The seat pad can be reduced in weight without being lowered. If the distance between the surface of the bead foam molded body facing the surface side of the seat pad main body and the surface of the seat pad main body is less than 15 mm in terms of the arrangement of the bead foam molded body, The soft foam resin between the surface facing the surface side and the surface of the seat pad body becomes too thin, and the proportion of the foam foam molded body, which is lighter than the soft foam resin, occupies the seat pad. Although it is advantageous for weight reduction of the seat pad, since the soft foam resin having a function as a cushioning material is thin, the bead foam molded body which is harder than the soft foam resin is strong for the seat occupant. The result is a foreign body feeling. Further, at the time of foam molding of the seat pad, since the liquid flow path of the soft foam resin raw material liquid is narrow, molding defects are easily caused and the moldability is poor. On the other hand, if the distance between the surface of the bead foam molded body facing the surface side of the seat pad body and the surface of the seat pad body exceeds 25 mm, the bead foam molded body is lighter than the soft foam resin. The ratio of the bead foam molded body to the seat pad is reduced, the weight reduction rate of the seat pad is reduced, the surface of the bead foam molded body facing the surface side of the seat pad main body, the surface of the seat pad main body, As the thickness of the soft foamed resin increases between the two, the cushioning property becomes too strong and the holding property is lowered. Therefore, in the arrangement of the bead foam molded body, the distance between the surface of the bead foam molded body facing the surface side of the seat pad main body and the surface of the seat pad main body needs to be in the range of 15 to 25 mm. Further, by covering at least a part of the back surface side of the seat pad main body and at least a part of the bead foam molded body with a supporter material, the bead foam molded body and the seat frame etc. are brought into sliding contact to generate abnormal noise. This can be prevented.

According to the invention of the above (2), by making the apparent density of the bead foam molded article in the range of 10 to 35 kg / m ³ , the weight of the seat pad, the feeling of foreign matter and the holdability received by the seat occupant, etc. Seating performance and formability can be balanced with a higher balance. If the apparent density of the bead foam molded body is less than 10 kg / m ³ , the weight reduction rate of the seat pad is improved, but there is a problem that the bead foam molded body is easily damaged during use of the seat pad. On the other hand, when the apparent density of the expanded bead molded article is more than 35 kg / m ^3, not only the weight reduction rate decreases, the higher foreign body sensation to give too hard beads foamed molded into a sheet of occupant. Accordingly, the apparent density of the bead foam molding is preferably in the range of 10 to 35 kg / m ³ . More preferably, the range of 10~25kg / m ^3, more preferably, in the range of 15 to 25 kg / m ^3.

  The seat pad of the invention of the above (3) is a seat back pad that is particularly required to satisfy both the seat pad weight reduction and the seat performance and formability such as a foreign object feeling and holdability received by the seat occupant in the side support portion. It is suitable for use.

It is a front view of the seat back pad which is one embodiment of the seat pad of the present invention. It is sectional drawing which follows the II line | wire of FIG. It is an enlarged view of the left side support part in FIG. It is explanatory drawing which shows the arrangement | positioning space | interval of the introduction part which consists of a polyurethane foam which abbreviate | omitted the supporter material and was seen from the back side of the seat back pad. It is sectional drawing of the metal mold | die which shape | molds a seat back pad. FIG. 6 is an enlarged view around the left side support part of the mold shown in FIG. 5.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a front view of a seat back pad which is an embodiment of the seat pad of the present invention, and reference numeral 1 in the drawing indicates the seat back pad of the embodiment. 2 is a cross-sectional view taken along the line II of FIG. 1. In FIG. 2, the upper side is the front side of the seat back pad 1, and the lower side is the back side of the seat back pad 1. FIG.

  As shown in FIG. 1, the seat back pad 1 of this embodiment includes a backrest portion 3 and left and right side support portions 4. On the surface of the seat back pad 1, a hanging groove 5 for hanging a skin material (not shown) is provided along the side support portion 4.

  As shown in FIG. 2, the seat back pad 1 includes a seat back pad body 10 made of a soft foam resin, a bead foam molded body 20 provided on the back surface of the seat back pad body 10, and a seat back pad body 10. And a supporter material 30 that covers at least a part of the back surface side of this and at least a part of the bead foam molded body 20.

  The bead foam molded body 20 is provided on the back surface side of the side support portion 4, and the back surface side of the bead foam molded body 20 is covered with a supporter material 30 made of a sheet-like nonwoven fabric. The supporter material 30 also covers a portion of the back surface of the seat pad body 10 adjacent to the bead foam molded body 20. As described above, since the back surface side of the bead foam molded body 20 on which the seat frame is disposed is covered with the supporter material 30, the bead foam molded body 20 and the seat frame or the like are not in direct sliding contact with each other. Generation of sound can be prevented.

  As shown in FIG. 3, the bead foam molded body 20 is disposed at a position where the distance between the surface of the bead foam molded body 20 facing the seat back pad main body 10 and the surface of the seat back pad main body 10 is L. The distance L needs to be in the range of 15 to 25 mm. By setting the distance L within a range of 15 to 25 mm, the seating performance is improved by improving the holdability without increasing the sense of foreign matter received by the seated person and securing the liquid flow path of the soft foam resin raw material liquid. Thus, the seat back pad 1 can be reduced in weight without deteriorating the performance. If the distance L is less than 15 mm, the thickness of the seat back pad main body 10 of the side support part 4 becomes too thin, and a lighter bead foam molded body 20 than the seat back pad main body 10 is added to the seat back pad 1 accordingly. Although the proportion of the seat back pad 1 is increased, it is advantageous for reducing the weight of the seat back pad 1. However, the seat back pad main body 10 has a thin thickness of the seat back pad main body 10 of the side support portion 4 having a function as a cushioning material. The bead foam molded body 20 which is harder than 10 gives a strong sense of foreign matter to the seat occupant. Further, at the time of foam molding of the seat back pad 1, the liquid flow path of the soft foamed resin raw material liquid is narrow, so that molding defects are easily caused and the moldability is poor. On the other hand, if the distance L exceeds 25 mm, the proportion of the bead foam molded body 20, which is lighter than the seat back pad main body 10, in the seat back pad 1 is reduced, and the weight reduction rate is reduced. As the seat back pad main body 10 becomes thicker, the cushion becomes too strong and the holdability is lowered. Accordingly, the distance L is in the range of 15 to 25 mm.

  As shown in FIG. 3, a recess 21 is provided on the back surface side of the bead foam molded body 20 to be fitted to a mold base 58 described later, and the supporter material 30 is along the surface of the recess 21. . That is, the supporter material 30 overlaps both the side surface and the bottom surface of the recess 21. A hole for inserting a projection 59 described later may be provided on the bottom surface of the recess 21. Note that the protrusion 59 may be pushed into the bead foam molded body 20 without providing a hole.

The soft foam resin forming the seat back pad body 10 is preferably made of polyurethane foam. The apparent density of the soft foamed resin is preferably in the range of 35 to 75 kg / m ³ . This is because if the apparent density of the soft foam resin is less than 35 kg / m ³ , the seat back pad main body 10 tends to “sag”, while if it exceeds 75 kg / m ³ , the weight of the seat back pad 1 is low. This is because the conversion rate decreases. In the present embodiment, the seat back pad body 10 is a polyurethane foam having an apparent density of 45 kg / m ³ . Further, the apparent density is defined by the average density, which is an average value, since the soft foamed resin usually has a distribution in density between the surface and the inside.

The bead foam molded body 20 is preferably made of expanded polystyrene (expanded polystyrene), expanded polyethylene, or the like. The apparent density of the bead foam molded body 20 is preferably in the range of 10 to 35 kg / m ³ . When the apparent density of the bead foam molded body 20 is less than 10 kg / m ³ , the weight reduction rate of the seat back pad 1 is improved, but the bead foam molded body 20 is easily damaged during use of the seat back pad 1. There is a problem. On the other hand, when the apparent density of the bead foam molded body 20 exceeds 35 kg / m ³ , not only does the weight reduction rate decrease, but the bead foam molded body 20 becomes too hard and the feeling of foreign matter given to the seat occupant becomes strong. . Therefore, the apparent density of the bead foam molded body 20 is preferably in the range of 10 to 35 kg / m ³ . More preferably, the range of 10~25kg / m ^3, more preferably, in the range of 15 to 25 kg / m ^3. In this embodiment, the bead foam molded body 20 is made of expanded polystyrene (expanded polystyrene) having an apparent density of 15 kg / m ³ . Note that the apparent density is defined by the average density, which is an average value, since the density of the bead foam molded body is usually distributed between the surface and the inside.

The supporter material 30 is preferably a nonwoven fabric made of at least one raw material selected from polypropylene, polyethylene, polyethylene terephthalate, acrylic, wool, rayon, and polyester having a basis weight of 10 to 300 g / m ² . The thickness of the supporter material 30 is preferably in the range of 0.2 to 1.0 mm, and more preferably in the range of 0.4 to 0.6 mm.

  Further, when the seat back pad main body 10, the bead foam molded body 20 and the support material 30 are made of the above materials, the adhesion between the seat back pad main body 10 and the bead foam molded body 20 is good, but the bead foam molded body. 20 and the supporter material 30 are not bonded. Therefore, in this embodiment, an introduction portion 40 made of polyurethane foam extending from the seat back pad main body 10 is arbitrarily provided. The support material 30 in the portion along the bead foam molded body 20 is adhered to the introduction portions 40a, 40b, and 40c constituting the introduction portion 40, and the bead foam molded body 20 is also adhered to the introduction portions 40a, 40b, and 40c. The supporter material 30 is fixed to the bead foam molded body 20. When the introduction portion 40 is not present, the supporter 30 has no means for fixing the supporter material 30 to the bead foam molded body 20 between the portion 32b away from the seat back pad main body 10 and the end portion 32a. The material 30 is easy to sag in a bag shape between the part 32a and the part 32b, and when the seat back pad 1 is attached to the seat frame, the sagger material 30 is hung on the seat frame parts and the like. There is a problem of damaging the material 30, but this problem can be solved by fixing the supporter material 30 at the introduction portion 40.

  The introduction portion 40 made of polyurethane foam serves to fix the supporter material 30 to the bead foam molded body 20 as described above, and therefore needs to be provided on the entire surface between the bead foam molded body 20 and the supporter material 30. Instead, it may be provided locally. In addition, when the introduction portion 40 is locally provided between the bead foam molded body 20 and the support material 30, the surface where the introduction portion 40 is not provided via the support material 30 when the seat back pad 1 is foam-molded. The bead foam molded body 20 can be positioned and disposed on the molding die by contacting the surface of the molding die.

  Next, the arrangement interval and size of the introduction portion 40 will be described with reference to FIG. FIG. 4 is an explanatory view showing an arrangement interval of the polyurethane foam introduction portions 40 as viewed from the back side of the seat back pad 1 with the supporter material 30 omitted. In FIG. 4, the three introduction portions 40a, 40b, and 40c constituting the introduction portion 40 are shown, but the number is not limited to this. The introduction portions 40a to 40c are formed in a rod shape so as to be in contact with both the bead foam molded body 20 and the supporter material 30. The size of each of the introduction portions 40a to 40c is preferably a cube or a rectangular parallelepiped having a side length of 10 mm or more, but each side does not necessarily have to be a straight line, and each angle does not necessarily have to be a right angle. .

  Further, the introduction portion 40 may be formed so as to surround the recesses 21a and 21c as shown in the introduction portions 40a and 40b in FIG. 4, or may be formed without including the recess 21 as shown in the introduction portion 40c. May be. Here, for example, since the recess 21a is surrounded by the introduction portion 40a, the support material 30 is bonded to the introduction portion 40a, that is, a part of the polyurethane foam on the side surface of the recess 21a. This is preferable in that the support material 30 does not peel in the recess 21a as compared to the recess 21b not surrounded by the portion 40.

  And although the introduction parts 40a-40c are arrange | positioned by the space | interval of the distance L1 in FIG. 4, the distance L1 does not need to be constant. For example, the interval between the introduction portion 40a and the introduction portion 40b and the interval between the introduction portion 40b and the introduction portion 40c may be different.

  Next, a mold for forming the seat back pad 1 will be described. FIG. 5 is a cross-sectional view of a mold for molding the seat back pad 1, and FIG. 6 is an enlarged view around the side support portion 4 on the left side of the mold shown in FIG. 5.

  The mold 50 has an upper mold 51 and a lower mold 52. From the lower mold 52, a ridge 53 for forming the hanging groove 5 is erected. Between the ridges 53 is a cavity portion 54 for forming the backrest portion 3, and outside the ridge 53 is a cavity portion 55 for forming the side support portion 4.

  As shown in FIG. 6, a pedestal 58 for positioning the bead foam molded body 20 is provided on the mold ceiling surface of the upper mold 51 facing the cavity portion 55 to hold the bead foam molded body 20. As a holding means for this purpose, a projection 59 projects downward from the pedestal portion 58. The projection 59 has a narrow neck portion on the base end side (the pedestal portion 58 side), and the diameter gradually increases from the neck portion to the lower side to become the maximum diameter portion. It has a pointed shape in which the diameter decreases toward the (lower end).

  In order to perform foam molding of the seat back pad 1, first, the supporter material 30 is disposed along the lower surface of the upper mold 51 and temporarily fixed to the upper mold 51 with a double-sided tape or the like. It should be noted that magnetic fibers are mixed into the supporter material 30 or a magnetic piece such as a wire is fastened to the supporter material 30 with a tape or the like, and a magnet is provided on the upper mold 51 so that the periphery of the supporter material 30 is The upper mold 51 may be magnetically attracted and held.

  Next, the bead foam molded body 20 is attached to the upper mold 51. At this time, the pedestal 58 is fitted into the recess 21 and the protrusion 59 is inserted into the bead foam molded body 20. As described above, a hole for engaging the protrusion 59 may be provided on the bottom surface of the recess 21, or the protrusion 59 may be pushed into the bead foam molded body 20 without providing such a hole.

  Thereafter, the polyurethane raw material liquid is supplied into the lower mold 52, the mold is closed, and the polyurethane is heated and foamed. Then, after foaming, it is cured, the mold is opened, and the mold is removed. The bead foam molded body 20 and the supporter material 30 are integrated with the seat back pad main body 10 made of polyurethane foam, and are smoothly released from the upper mold 51. A crush process may be performed after demolding.

  In the seat back pad 1 manufactured as described above, the bead foam molded body 20 is covered with the supporter material 30, so that abnormal noise is generated due to the sliding contact between the bead foam molded body 20 and the seat frame or the like. Is prevented. The bead foam molded body 20 is formed in advance, and the support material 30 is not impregnated with the resin from the bead foam molded body 20 when the seat back pad 1 is foam molded. Generation of abnormal noise due to sliding contact is also prevented.

  When the introduction portion 40 made of polyurethane foam is provided, when the polyurethane is heated and foamed, the polyurethane raw material liquid enters the groove formed in the bead foam molded body 20 from the portion 42a and the portion 42b shown in FIG. Flow in to form the introduction portion 40b. The same applies to the introduction portions 40b and 40c. Thereby, since the supporter material 30 is fixed by the introduction part 40 along the bead foam molded body 20, the supporter material 30 does not hang down in a bag shape between the part 32a and the part 32b, and the seat back pad It is preferable that the supporter material 30 is not damaged by hooking the hanging portion of the supporter material 30 to the seat frame parts or the like in the operation of attaching 1 to the seat frame.

  In the present embodiment, since the bead foam molded body 20 is made of foamed polystyrene (foamed polystyrene) that is lighter than polyurethane foam, the weight of the seat back pad 1 can be reduced.

  In addition, since a polystyrene foam (expanded polystyrene) is lighter and has higher hardness than polyurethane foam, the hardness of the side support portion 4 can be increased to improve the holdability.

  In the present embodiment, since a sheet-like material such as a nonwoven fabric is used as the supporter material 30, the supporter material 30 can be easily arranged along the upper mold 51. In addition, since the supporter material 30 is sandwiched between the bead foam molded body 20 and the upper mold 51 during foam molding of the seat pad main body 10, displacement of the supporter material 30 is prevented.

  In this embodiment, as shown in FIG. 2, the recessed portion 7 where the bead foam molded body 20 faces is provided on the back side of the seat back pad 1, and the seat frame is fitted therewith. Misalignment between the body 20 and the seat frame or the like is prevented. Then, by engaging the concave portion 21 of the bead foam molded body 20 with the pedestal portion 58 of the upper mold 51, misalignment of the bead foam molded body 20 during molding is prevented.

  In the present embodiment, the bead foam molded body 20 can be firmly held by the upper mold 51 by pushing the protrusion 59 into engagement with the bottom surface of the recess 21.

  The invention is further illustrated by the following examples.

(Sample Nos. 1-3)
As Examples 1 to 3, Sample Nos. 1 to 3 in which the distances L of the seat back pad 1 of the above-described embodiment were 15, 20 and 25 mm, respectively. The seat back pad main body 10 was a polyurethane foam having an apparent density of 45 kg / m ³ , and the bead foam molded body 20 was a polystyrene foam (expanded polystyrene) having an apparent density of 15 kg / m ³ .

(Sample No. 4 and Sample No. 5)
As Comparative Example 1 and Comparative Example 2, Sample No. 4 and Sample No. 5 were prepared in the same manner as Sample No. 1 except that the distance L of the seat back pad 1 of the above embodiment was 10 and 30 mm, respectively. did.

(Sample Nos. 6-11)
As Examples 4 to 9, the bead foam molded body 20 was the same as Sample No. 2 except that the foamed polystyrene (expanded polystyrene) having an apparent density of 10, 20, 25, ³⁰ , 35 and 40 kg / m ³ was used. Samples Nos. 6 to 11 were produced.

(Sample No. 12)
As Conventional Example 1, Sample No. 12, which is a single-hardness seat back pad, was prepared, which did not include the bead foam molded body 20 and was made of polyurethane foam having an apparent density of 45 kg / m ³ in all parts.

(Sample No. 13)
As Conventional Example 2, the seat back pad body 10 is made of polyurethane foam with an apparent density of 45 kg / m ³ , the side support part 4 is made of polyurethane foam with an apparent density of 55 kg / m ³ , and the side support part 4 is more than the seat back pad body 10. Sample No. 13 which is a seat back pad in which is hardened was prepared.

  Each sample thus obtained was evaluated for the foreign material feeling, holdability, moldability, and weight reduction by the following methods. Further, for each sample, the presence or absence of breakage of the foam foam molded article when the seat back pad was incorporated into the sheet and used was also investigated by the following method.

(Foreign object feeling)
Ten testers were seated on the car seat using the seat back pad of each sample, and each tester scored whether there was any foreign object feeling in the side support part with a maximum of 10 points. The average score was evaluated as follows.
◎: 9 points or more ◎: 8 points or more and less than 9 points ○: 7 points or more and less than 8 points Δ: 5 points or more and less than 7 points ×: Less than 5 points

(Holding property)
Ten testers are seated on the car seat using the seat back pad of each sample, and each tester scores the body holdability at the side support part with a maximum of 10 points. The average score was evaluated as follows.
○: 8 points or more Δ: 5 points or more and less than 8 points ×: Less than 5 points

(Formability)
Evaluation was performed as follows in terms of the ratio of occurrence of poor liquid circulation in the portion of the distance L when 20 samples were produced.
A: Occurrence rate of defects around the liquid 0%
○: Occurrence rate of defective liquids over 0% and less than 5% △: Occurrence rate of defective liquids 5% or more and less than 10% ×: Occurrence rate of defective liquids 10% or more

(Light weight)
Based on the mass of Sample No. 13 as Conventional Example 2, the mass of each sample was measured, the weight reduction rate was calculated, and the weight reduction degree was evaluated as follows.
◎◎: Lightweight ratio 13% or more ◎: Lightweight ratio 10% or more and less than 13% ○: Lightweight ratio 6% or more and less than 10% △: Lightweight ratio 3% or more and less than 6% ×: Lightweight ratio 3% or less

(Whether or not the foamed molded beads are damaged during use)
When the seat back pad 1 is incorporated in a sheet and used, a maximum load of 1000 N applied to the bead foam molded body 20 is applied to the side support portion 4 of each sample to investigate whether the bead foam molded body 20 is damaged. Thus, it was evaluated whether or not the bead foam molded body was damaged when the seat back pad was incorporated into a sheet and used.

  The evaluation results are shown in Table 1.

  As is apparent from the table, Examples 1 to 9 achieve a good weight reduction rate of 5% or more without deteriorating the seating performance and formability such as foreign object feeling and holdability that the seated person receives. Confirmed that. On the other hand, Comparative Example 1 and Comparative Example 2 in which the distance L is outside the appropriate range, although satisfying 10% or more in terms of weight reduction rate, it was confirmed that any of foreign matter feeling, holdability and formability was inferior did it.

  In addition, the place mentioned above only illustrated embodiment of this invention, and this invention can add a various change within the description range of a claim. For example, the seat pad of the present invention may be a seat cushion pad (seat surface seat pad) having a side support portion.

  According to the present invention, the bead foam molded body is disposed at a position where the distance between the surface of the bead foam molded body facing the surface side of the seat pad body and the surface of the seat pad body is in the range of 15 to 25 mm. By arranging it in the seat, the holdability is improved without increasing the feeling of foreign matter received by the seat occupant, and the liquid flow path of the soft foam resin raw material liquid is secured, so that the seating performance and moldability are not deteriorated. The seat pad can be reduced in weight. If the distance between the surface of the bead foam molded body facing the surface side of the seat pad main body and the surface of the seat pad main body is less than 15 mm in terms of the arrangement of the bead foam molded body, The soft foam resin between the surface facing the surface side and the surface of the seat pad body becomes too thin, and the proportion of the foam foam molded body, which is lighter than the soft foam resin, occupies the seat pad. Although it is advantageous for weight reduction of the seat pad, since the soft foam resin having a function as a cushioning material is thin, the bead foam molded body which is harder than the soft foam resin is strong for the seat occupant. The result is a foreign body feeling. Further, at the time of foam molding of the seat pad, since the liquid flow path of the soft foam resin raw material liquid is narrow, molding defects are easily caused and the moldability is poor. On the other hand, if the distance between the surface of the bead foam molded body facing the surface side of the seat pad body and the surface of the seat pad body exceeds 25 mm, the bead foam molded body is lighter than the soft foam resin. The ratio of the bead foam molded body to the seat pad is reduced, the weight reduction rate of the seat pad is reduced, the surface of the bead foam molded body facing the surface side of the seat pad main body, the surface of the seat pad main body, As the thickness of the soft foamed resin increases between the two, the cushioning property becomes too strong and the holding property is lowered. Therefore, in the arrangement of the bead foam molded body, the distance between the surface of the bead foam molded body facing the surface side of the seat pad main body and the surface of the seat pad main body needs to be in the range of 15 to 25 mm. Further, by covering at least a part of the back surface side of the seat pad main body and at least a part of the bead foam molded body with a supporter material, the bead foam molded body and the seat frame etc. are brought into sliding contact to generate abnormal noise. This can be prevented.

1 Seat back pad
3 Backrest
4 Side support part
5 Suspension groove
7 Recessed shape
10 Seat back pad body
20 Bead foam molding
21, 21a, 21b, 21c, 21d recess
30 Supporter material
32a, 32b site
40, 40a, 40b, 40c Introduced part made of polyurethane foam
42a, 42b site
50 molds
51 Upper mold
52 Lower mold
53 ridges
54, 55 Cavity
58 pedestal
59 Protrusions

Claims (3)

A seat pad body made of a soft foam resin;
A bead foam molded body integrally disposed on the back side of the seat pad body;
A supporter material that covers at least a part of the back side of the seat pad main body and at least a part of the bead foam molded body;
With
The bead foam molded body is disposed at a position where the distance between the surface of the bead foam molded body facing the surface side of the seat pad body and the surface of the seat pad body is 15 to 25 mm. , Seat pad. The expanded bead molded article, apparent density: characterized made possible than 10~35kg / m ³ beads expanded polystyrene (EPS), the seat pad of claim 1, wherein.   The seat pad according to claim 1, wherein the position where the bead foam molded body is disposed is a side support portion of the seat back pad.

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