U.S. patent application number 10/843439 was filed with the patent office on 2005-03-10 for pillow.
Invention is credited to Setokawa, Hiroto.
Application Number | 20050050636 10/843439 |
Document ID | / |
Family ID | 34225111 |
Filed Date | 2005-03-10 |
United States Patent
Application |
20050050636 |
Kind Code |
A1 |
Setokawa, Hiroto |
March 10, 2005 |
Pillow
Abstract
A pillow (1) according to present invention comprises a body (3)
including a concave portion (7) in a central part and a cold
insulator (5) incorporated in the concave portion (7). The cold
insulator (5) has a gel material enclosed in a bag member which is
formed by an enclosing film. It is preferable that the body (3)
should be formed of a rubber or a synthetic resin material and
should have a flexibility and a restoring property for a
deformation. It is more preferable that the gel material should be
a hydrogel or a lipogel. Furthermore, a plurality of dents (9) is
provided on the surfaces of the body (3) and the cold insulator
(5). The pillow can hold and cool a head in such a shape as to
conform to the shapes of a neck and a head, thereby casting no
burden on a human body. A cooling function lasts long by the cold
insulator (5) incorporated in the body (3). Plural kinds of cold
insulators (5) to be incorporated can be retained and replaced, and
can be regulated depending on a user and a situation.
Inventors: |
Setokawa, Hiroto; (Kobe-shi,
JP) |
Correspondence
Address: |
BIRCH STEWART KOLASCH & BIRCH
PO BOX 747
FALLS CHURCH
VA
22040-0747
US
|
Family ID: |
34225111 |
Appl. No.: |
10/843439 |
Filed: |
May 12, 2004 |
Current U.S.
Class: |
5/636 ; 5/644;
5/909 |
Current CPC
Class: |
A61F 2007/0002 20130101;
A47G 2009/008 20130101; A61F 7/10 20130101; A47G 9/1036 20130101;
A61F 2007/0219 20130101; A61F 7/02 20130101; A61F 2007/108
20130101 |
Class at
Publication: |
005/636 ;
005/644; 005/909 |
International
Class: |
A47G 009/00 |
Foreign Application Data
Date |
Code |
Application Number |
Sep 4, 2003 |
JP |
2003-312629 |
Claims
What is claimed is:
1. A pillow comprising: a body including a concave portion in a
central part; and a cold insulator incorporated in the concave
portion, the cold insulator having a gel material enclosed in a bag
member.
2. The pillow according to claim 1, wherein the body is formed of a
rubber or a synthetic resin material and has a flexibility and a
restoring property for a deformation.
3. The pillow according to claim 1, wherein the gel material is a
hydrogel or a lipogel.
4. The pillow according to claim 1, wherein a plurality of dents is
provided on surfaces of the body and the cold insulator.
Description
[0001] This application claims priority on Patent Application No.
2003-312629 filed in Japan on Sep. 4, 2003
BACKGROUND OF THE INVENTION
[0002] 1. Field of the Invention
[0003] The present invention relates to a pillow. More
particularly, the present invention relates to a pillow to be used
for cooling a head.
[0004] 2. Description of the Related Art
[0005] Conventionally, a water pillow has been used for cooling a
head of a person. The water pillow is troublesome to replace ice or
water. For the replacement, a place, a vessel or the like for
treating the water is required. In order to eliminate the troubles,
various devises have been made. For example, Japanese Laid-Open
Patent Publication No. 2002-330986 has described a pillow in which
a capsule requiring no water is put. In place of the ice, the
capsule is cooled and filled in the pillow for use.
[0006] Japanese Laid-Open Patent Publication No. 2001-297 has
described a pillow in which a cold insulator is accommodated in a
pocket provided on a pillow cover. The cold insulator is put on the
market. Since the cold insulator takes the shape of a simple sheet,
it is thin. The cold insulator has a larger contact area with the
air and a small cold insulating capability.
[0007] Japanese Laid-Open Patent Publication No. 2001-198151 has
described a cooled type cooling package utilizing an endothermic
reaction in the dissolution of salt in water. When a pillow is to
be used, an isolated cooling agent is mixed with the water and they
are dissolved to start the endothermic reaction. The endothermic
reaction process is caused to progress continuously for a long
period of time by the gelation of salt water to be a reactive
product. The gel thus generated is used in the same manner as the
cold insulator.
SUMMARY OF THE INVENTION
[0008] The shape of a pillow which conforms to a cervical vertebrae
in the same manner as a stand-up posture is better because it does
not cause a body to carry a burden. For this purpose, it is
necessary to hold a stability and a comfort to sleep when a head is
put on the pillow while maintaining the shape of the pillow formed
to be constant. In order to maintain the shape of the pillow, it is
necessary to cause the pillow to have a restoring property. Both
the pillow and a package are deformed according to the motion of
the head and have no shape holding function in the same manner as a
conventional water pillow. On the other hand, if a shape holding
capability is too large, a shape following property is poorer so
that the stability of the head and the comfort to sleep are
deteriorated. More specifically, a flexibility is required for the
pillow in order to enhance the stability and the comfort to sleep.
In consideration of the actual circumstances described above, it is
an object of the present invention to provide a pillow in which a
head can be held and cooled in such a shape as to conform to the
shapes of a neck and a head so as not to cast a burden on a human
body, the cooling can last long and a comfort to sleep can be
enhanced.
[0009] The present invention provides a pillow comprising a body
including a concave portion in a central part, and a cold insulator
incorporated in the concave portion, the cold insulator having a
gel material enclosed in a bag member.
[0010] It is preferable that the body should be formed of a rubber
or a synthetic resin material and should have a flexibility and a
restoring property for a deformation.
[0011] It is more preferable that the gel material should be a
hydrogel or a lipogel.
[0012] It is further preferable that a plurality of dents should be
provided on surfaces of the body and the cold insulator.
[0013] This pillow can hold and cool the head portion in such a
shape as to conform to the shapes of a neck and a head. Therefore,
a burden is not cast on a human body. The cooling function of a
cold insulator which is incorporated can last long. Moreover,
plural kinds of cold insulators to be incorporated can be retained
and replaced. An adjustment can be carried out depending on a
difference in the physical constitution and uses of a user.
BRIEF DESCRIPTION OF THE DRAWINGS
[0014] FIG. 1 is a perspective view showing a pillow according to
an embodiment of the present invention,
[0015] FIG. 2(a) is a plan view of FIG. 1, FIG. 2(b) is a front
view of FIG. 1, and FIG. 2(c) is a side view of FIG. 1,
[0016] FIG. 3 is a sectional view taken along a III-III line in
FIG. 2,
[0017] FIG. 4 is a sectional view taken along a IV-IV line in FIG.
2,
[0018] FIG. 5 is a perspective view showing a pillow according to
another embodiment of the present invention, and
[0019] FIG. 6 is a graph showing a change in a temperature which is
obtained when pillows according to an example and a comparative
example are used.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0020] The present invention will be described below in detail
based on a preferred embodiment with reference to the accompanying
drawings.
[0021] FIGS. 1 to 4 show a pillow 1 according to an embodiment of
the present invention. The pillow 1 is formed by a body 3 and a
cold insulator 5. The body 3 has a concave portion 7 for
incorporating the cold insulator 5 therein. The cold insulator has
such a contour as to almost conform to the shape of the concave
portion 7 so as to be fitted in the concave portion 7. More
specifically, the cold insulator 5 is incorporated into a central
part in the longitudinal direction of the body 3. Thus, the body 3
and the cold insulator 5 are combined to obtain the configuration
of the pillow to be used.
[0022] The size of the body 3 is not particularly restricted but
always has a width L of 400 mm to 1000 mm, a depth W of 300 mm to
500 mm and a height H of 10 mm to 190 mm. As will be described
below, the shape of the concave portion 7 is determined
corresponding to the cold insulator 5 to be formed in consideration
of the figure of a person. The shape (mainly a height and a curved
shape) of the cold insulator 5 to be incorporated in the concave
portion 7 is set in such a manner that the shape of the whole
pillow is smoothened in combination with the cold insulator 5.
[0023] It is preferable that the body 3 should have such a hardness
as to support the head of a person and should have a flexibility
and a restoring property. For this reason, it is preferable that a
rubber or a synthetic resin material should be used for the body 3.
The rubber to be used includes a natural rubber, an isoprene
rubber, a butadiene rubber, a styrene-butadiene rubber, an
acrylonitrile-butadiene rubber and the like. The synthetic resin
material to be used includes a thermoplastic elastomer belonging to
a type such as polyurethane, polyester, polyamide, polyolefin,
polystyrene, polyvinyl chloride, silicone, polybutadiene and the
like, or a combination of plural kinds.
[0024] It is more preferable that the material of the body 3 should
be a polyurethane foam because a flexibility and various hardnesses
can be regulated. In particular, a polyurethane foam having a low
repulsion is further preferable. The body 3 is obtained by molding
these materials through a molding method such as injection molding,
blow molding or extrusion molding.
[0025] In the case in which a flexibility (which is also referred
to as a softness) of the cold insulator 5 is large and a shape
holding capability is small, particularly, the body 3 is formed in
such a manner that the cold insulator 5 is maintained within the
range of a predetermined shape by the concave portion 7. For
example, a material having a comparatively small flexibility and a
high shape holding property is selected for the material of the
body 3. Alternatively, a material such as a side wall forming the
concave portion 7 may be partially thickened and the shape of the
concave portion 7 may be changed with difficulty. Moreover, a
material having a higher elastic modulus than that of the material
of the body 3 may be partially provided around the concave portion
7.
[0026] The cold insulator 5 can be replaced and incorporated into
the concave portion 7 of the body 3 as will be described below. For
this reason, the concave portion 7 is formed in conformity to the
shape of the cold insulator 5. When plural kinds of cold insulators
5 formed separately have a difference in a dimension, however, a
slight clearance may be formed between the concave portion 7 of the
body 3 and the cold insulator 5 in order to absorb the error. Also
in the case in which the clearance is not formed, the cold
insulator 5 can be incorporated within the range of the flexibility
because the body 3 and the cold insulator 5 have flexibilities. In
some cases in which the clearance is too large, the range of a
predetermined shape cannot be maintained, for example, the sink of
a head is too deep, which is not preferable.
[0027] The concave portion 7 of the body 3 is provided based on a
position on which a rear head is mounted and a size in use. A
curved surface conforming to a shape from a neck to a rear head
when a person stands up is formed in the central part of the pillow
1. The shape of the curved surface is taken by both the body 3 and
the cold insulator 5.
[0028] As is apparent from FIGS. 3 and 4, a portion of the body 3
in which the rear head is positioned when a person puts a head has
a height reduced. The portion on which a neck provided just above a
shoulder is put has a height increased. In the case in which the
cold insulator 5 is large, this shape is mainly taken and held by
the cold insulator 5. In the case in which the cold insulator 5 is
small, a predetermined shape is mainly defined by the shape of the
body 3.
[0029] The body 3 has a flexibility capable of following a
deformation in a state in which the cold insulator 5 is
incorporated. A person having a head put on the pillow 1 changes
the direction of the head or shifts the position of the head. In
order to enhance the deformation following property of the pillow
1, a material having a low repulsive elastic modulus is preferable.
In order to obtain a good feeling of use, the body 3 including the
concave portion 7 requires the deformation following property to
some extent. For this reason, it is necessary to have a proper
flexibility and restoring property and to distribute and support
the weight of the head over the whole surface of the head.
[0030] It is preferable that the body 3 should have a plurality of
dents 9 on a surface. The dent 9 prevents the adhesion of the head
or the like to the body 3 when the head of a person or the like is
put on the pillow 1. More specifically, a clearance is formed
between the head or the like and the body 3. Since the clearance
has a gas permeability, neither a sticky feeling nor stuffiness is
generated. The dent 9 is formed by providing a groove, a hole, a
projection or the like on a surface. The pillow 1 illustrated in
FIGS. 1 to 4 has a parallel groove in a longitudinal direction on a
surface. The shape of the groove, that is, a depth, an interval or
the like is taken in conformity to the properties of the body 3 and
the cold insulator 5 in order to enhance the feeling of use.
[0031] The surface of the cold insulator 5 is formed in conformity
to a curved surface from a nape to the rear head in a stand-up
posture. The cold insulator 5 is independently fabricated
separately from the body 3. Plural kinds of cold insulators 5 can
be prepared for one of the bodies 3. More specifically, only the
cold insulator 5 can be removed from the body 3 and can be cooled
or frozen. As long as the cold insulator 5 can be incorporated in
the concave portion 7 of the body 3, particularly, it can be
replaced with a cold insulator having a different shape, for
example, a different height (thickness), a different curved shape
of a surface or the like. Moreover, it is also possible to prepare
various cold insulators 5 having different hardnesses and cold
insulating performances of a cold insulating material. These can be
selected according to circumstances.
[0032] The size of the cold insulator 5 usually has a width N of
100 mm to 500 mm, a depth M of 150 mm to 500 mm and a height P of
10 mm to 190 mm. In order to combine the cold insulator 5 with the
body 3 to adjust the shape of the pillow 1, the shape of the pillow
1 is mainly adjusted depending on the height of the cold insulator
5. The height of the cold insulator 5 can be varied according to a
distance among the depth of the neck portion of a user, a shoulder
of the user lying down and a side head, and furthermore, the
preference of the user.
[0033] The cold insulator 5 is fitted in the central part of the
pillow 1 with a constant thickness, thereby forming a part of the
pillow 1. The side surface of the cold insulator 5 is maintained to
be protected from an outside through the body 3 formed of a foam or
the like. Since the foam of the side surface has a heat insulating
function, a thermal conduction from the side surface of the cold
insulator 5 is lessened. Accordingly, an area on the surface side
of the pillow 1 to which a heat is transferred from the outside is
relatively reduced with respect to the volume of the cold insulator
5. By the combination structure of the cold insulator 5 and the
body 3, an excessive heat is transferred from the outside to the
cold insulator 5 with difficulty. Referring to the pillow 1,
therefore, a cooling time is prolonged.
[0034] The cold insulator 5 also has some shape holding
capabilities while supporting the weights of the head and the neck.
By this function, the burden of the neck can be decreased when a
person puts a head on the pillow 1. If the shape holding property
is too great, however, the cold insulator 5 tends to be too hard.
If the cold insulator 5 is too hard, the deformation following
property becomes insufficient when the positions of the head and
the neck are shifted. In order to enhance the feeling of use, the
deformation following property is required to some extent. The cold
insulator 5 has a flexibility capable of following a deformation.
The cold insulator 5 has a proper flexibility and restoring
property and can distribute and support the weight of the head over
the whole surface of the head. For a material, a gel material is
preferable.
[0035] The cold insulator 5 is usually used at a surface
temperature of 5.degree. C. to 30.degree. C. The surface
temperature of the cold insulator 5 is preferably 1.degree. C. to
25.degree. C., and more preferably, 12.degree. C. to 20.degree. C.
There is selected a gel material which is advantageous to uses for
a long time at this temperature.
[0036] Examples of the gel material include a hydrogel having water
as a solvent and a lipogel having oil as the solvent depending on
the solvent. Examples of the hydrogel include polyacrylic acid,
polyacrylate (sodium polyacrylate or the like), polyvinyl alcohol,
polyvinyl pyrrolidone, polyethylene oxide, sodium carboxymethyl
cellulose, hydroxypropyl cellulose, hydroxyethyl cellulose, methyl
cellulose, sodium alginate, xanthan gum, gum arabic, traganth gum,
karayagum and a maleic anhydride copolymer. For example,
polyacrylic acid having a weight-average molecular weight of
approximately 1000000 to 5000000 is suitably used.
[0037] Examples of the lipogel include gels comprising
polyurethane, polyolefin, polystyrene, silicone, polyethylene,
polyester, a vinyl acetate copolymer, polyvinyl chloride, neoprene
and a polybutadiene rubber. These polymers are used singly or in
combination. Moreover, it is possible to give or regulate an
elasticity by adding a softening agent, a plasticizer, a filler or
the like depending on the properties of these polymers.
[0038] The lipogel is prepared by crosslinking these polymers
together with oil. For example, there are used 100 parts by weight
of oil in which a polymer is dissolved at an ordinary temperature,
10 to 20 parts by weight of a polymer, and organic peroxide. For
the oil, there is used a plasticizer, for example, vegetable oil
such as olive oil or castor oil, mineral oil such as liquid
paraffin or process oil, ester oil such as diethyl sebacate,
dioctyl phthalate, dioctyl adipate, ethyl cinnamate, ethyl
phenylacetic acid, ethyl oleate or benzyl benzoate, or animal oil
such as squalene.
[0039] Examples of the organic peroxide include lauroyl peroxide,
acetyl peroxide, benzoyl peroxide, methyl ethyl ketone peroxide,
cyclohexanone peroxide, t-butyl peroxybenzoate and dicumyl
peroxide.
[0040] Referring to the hydrogel and the lipogel, the lipogel is
preferable because it has a viscosity at a low temperature. In
particular, a polyurethane gel is preferable because a pressure
dispersibility, a workability, a price and the like are balanced. A
thermosetting polyurethane gel is more preferable. The polyurethane
gel is obtained by heating and curing a mixture of polyol and
isocyanate. Examples of the polyol include polyether polyol,
polyester polyol, polycarbonate polyol and polybutadiene polyol. In
particular, polyether type polyol is more preferably used in
respect of a softness and a restoring property. Examples of the
isocyanate include MDI, TDI, IPDI, HDI, HMDI, PPDI and XDI.
[0041] These gel compacts are obtained by carrying out filling in a
bag having a predetermined shape formed by an enclosing film and
crosslinking, for example. The gel compact may be obtained by
pouring into a metal mold, and carrying out extrusion molding by
means of an extruder and then performing crosslinking. If the
enclosing film is resistant to some external force, a gel material
is not soaked therein and properties are not changed by the gel
material, there is no particular restriction. For example, the
enclosing film is formed of polyurethane, polyethylene,
polypropylene, polyester, polyethylene-terephthalate (PET),
polybuthylene-terephthalate (PBTO), polyamide, polyvinyl chloride
and polyvinylidene chloride or the like. Moreover, their composite
film or an aluminized film can also be used.
[0042] In the case in which the thermosetting polyurethane gel is
used, a polyurethane film is suitable for the enclosing film. The
polyurethane gel and the polyurethane film have excellent adhesive
properties. Therefore, the film is rarely peeled from the gel. For
this reason, the surface condition of the cold insulator 5 is
maintained uniformly and excellent shape holding properties can
also be obtained.
[0043] It is preferable that the enclosing film should have a
thickness of 0.02 mm to 1 mm. If the thickness is smaller than 0.02
mm, there is a possibility that the film might be easily broken,
resulting in a deterioration in a durability. If the thickness is
greater than 1 mm, a flexibility is poor and a person feels a
hardness when his (her) head comes in contact so that a comfort to
sleep cannot be obtained.
[0044] It is preferable that the enclosing film should have a
tensile strength of 10N or more, an elongation at break of 200% or
more and a tear strength of 5N or more. In the case in which the
tensile strength and the tear strength are smaller than the values
described above, there is a possibility that the durability might
be deteriorated. If the elongation at break is smaller than 200%, a
flexibility is low. Consequently, there is a possibility that the
degree of freedom of a deformation might be too low. For this
reason, the cold insulator 5 conforms to the shapes of human necks
and heads with difficulty and the comfort to sleep tends to be
deteriorated. If the elongation at break is too small, moreover,
the film restrains the deformation of the gel material from being
caused by a turn-over in bed or the like. Consequently, only the
film bears a deforming force. In this case, a stress concentration
is easily generated on the film so that the durability of the film
is deteriorated.
[0045] It is preferable that the surface of the cold insulator 5
should have a plurality of dents 9. A groove, a hole, a projection
and the like are provided on the surface of the pillow 1 including
the cold insulator 5. As shown in FIGS. 1 to 4, the cold insulator
5 has the same groove-shaped dent 9 as that of the body 3. The
shape of the dent 9 of the cold insulator 5 does not need to be
identical to that of the dent 9 of the body 3. By the dent 9, the
cold insulator 5 has an air permeability. In the cold insulator 5,
when the head or neck of a person directly comes in contact with
the cold insulator 5, a stuffiness can be prevented from being
caused by the perspiration of the person.
[0046] The same armor cover as the body 3 can be attached as an
armor for the enclosing film to the cold insulator 5. The material
of the armor cover may be the same as that of a well-known cover.
For the armor cover, there is used a natural fiber such as silk,
cotton or wool or a synthetic fiber such as polypropylene,
polyester, polyamide, polyvinyl alcohol or polyvinylidene chloride.
A nonwoven fabric, a woven fabric, a knitted fabric or the like
constituted by these fibers is used. In respect of an enhancement
in a touch, their layered product and a fabric having a high
porosity are preferable. It is also possible to use a natural
leather or an artificial leather for the armor cover. The thickness
of the armor cover or the like is taken into consideration so as
not to lose the function of the concavo-convex shape of the
surface.
[0047] In the case in which the head and the neck portion of the
person are to be cooled, it is preferable that a body temperature
should be dropped by 1.degree. C. in two hours when the person is
induced to sleep. When the pillow 1 is used, the cold insulator 5
cooled previously in a refrigerator or the like is embedded in the
body 3. The cold insulator 5 effectively cools the rear head and
the neck which are put on the pillow 1. The cold insulator 5 has an
excellent cold insulating property because an excessive heat is
transferred with difficulty as described above. Accordingly, the
cold insulator 5 lasts a cooling effect for a long period of
time.
[0048] FIG. 5 is a perspective view showing a pillow 15 according
to another embodiment of the present invention. The pillow 15 also
comprises a body 17 and a cold insulator 19. The body 17 has such a
shape that the height of a central part on which the head of a
person is put is the smallest. The cold insulator 19 is embedded in
the body 17 in such a shape as to correspond to a concave portion
provided in the central part of the body 17. The shape of a surface
formed by combining the cold insulator 19 and the body 17 conforms
to the shapes of a neck and a rear head in the stand-up posture of
a person.
[0049] The surface of the cold insulator 19 is provided with a
plurality of elliptical dents 21. The body 17 also has a
concavo-convex dent, which is not shown. In the same manner as in
FIG. 1, a shape holding property and a flexibility are taken into
consideration and the materials of the cold insulator and the body
and the like are used. The pillow 15 can also cool the head without
casting a burden on a human body. Moreover, the cold insulator 17
can have an excellent cold insulating property and a cooling
capability can last long, and furthermore, a comfort to sleep can
be obtained.
EXAMPLES
[0050] While the advantages of the present invention will be
apparent from examples, the present invention should not be
construed to be restricted based on the description of the
examples.
Example
[0051] A rubber composition containing a natural rubber as a base
material (100 parts by weight of a natural rubber, 115 parts by
weight of a filler, 4 parts by weight of a softening agent, 5.5
parts by weight of zinc white, 1.1 parts by weight of stearic acid,
5 parts by weight of a foaming agent, 2 parts by weight of sulfur,
0.9 part by weight of a vulcanization accelerator and 0.6 part by
weight of an antioxidant) was put in a metal mold and was
vulcanized and foamed at 150.degree. C. for 10 minutes, and was
thus molded to manufacture a body comprising a concave portion. On
the other hand, a polyurethane film (a thickness of 0.1 mm, a
tensile strength of 20N, a tear strength of 8N and an elongation at
break of 220%) was laid over a metal mold having such a shape as to
correspond to the shape of the concave portion of the body, and the
temperature of a polyurethane gel was raised to 50.degree. C. and
was poured in an amount of approximately 50 mm into the metal mold,
and was filled with a curing type polyurethane gel and was
crosslinked for 30 minutes at 120.degree. C., and the metal mold
was cooled to take out a molded product so that a cold insulator
was obtained. The cold insulator was combined with the body and was
covered with an armor cover (for the body; 100% cotton). Thus, a
pillow according to the example was obtained.
Comparative Example
[0052] As a comparative example, there was used a general flat
pillow put on the market which includes a cold insulator put on the
market (manufactured by Dunlop Home Products Co., Ltd., trade name
of "Soft Snow Pillow", a thickness of 30 mm, a length of 190 mm and
a width of 340 mm) (which is fabricated by a polyurethane foam, a
width of 550 mm, a depth of 380 mm and a height of 10 mm, having an
armor cover made of 100% cotton).
[0053] [Evaluation]
[0054] Testing method: A head was put and the surface temperatures
of a neck and a cold insulator were measured by using MT-8
manufactured by Gram Co., Ltd. A result is shown in FIG. 6.
Furthermore, ten testers were caused to use the cold insulator at
15.degree. C. to carry out a functional evaluation for a comfort, a
feeling of a fitness and a feeling of a stuffiness. An average
value was calculated based on an evaluation in five stages (very
good: 5, good: 4, normal: 3, bad: 2, very bad: 1) so that a result
in Table 1 was obtained.
1 TABLE 1 Example Comparative Example Comfort 4.5 3.4 Feeling of
fitness 4.1 2.2 Feeling of stuffiness 3.5 1.8
[0055] As shown in FIG. 6, in the pillow according to the example,
a rise in a temperature after the start of use is smaller, and
apparently, a cooling function lasts longer and is more excellent
than the pillow according to the comparative example. As shown in
the Table 1, moreover, a manufacturing method according to the
example has a higher evaluation than a manufacturing method
according to the comparative example. From the result of the
evaluation, the advantages of the present invention are
apparent.
[0056] The above description is only illustrative and various
changes can be made without departing from the scope of the present
invention.
* * * * *