JP2009142347A - Cooling pad - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pad having a cooling function which never slide from a prescribed position during use. <P>SOLUTION: The cooling pad has sheet materials on the obverse and the reverse of polyurethane foam 4 to 12 mm thick, and joins the peripheral portion of the sheet materials to seal up the polyurethane foam therein. The polyurethane foam is impregnated with a solution having a viscosity of 30 to 600 cps and accounting for 70 to 120% of the volume of the polyurethane foam. The polyurethane foam is fixed in the pad by a fixing means. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a pad that can be widely used for beds, pillows, and the like and can impart a cooling effect to an application site in a human body.

  Conventionally, sol pads have been proposed for the purpose of giving a cooling effect to the human body. However, the sol pad has poor shape retention, and when body pressure is applied to the sol pad, the sol moves to other than the body pressure portion. As a result, there is a problem that a portion having no cooling effect is generated without the sol.

  In order to solve this problem, a cooling sheet-like material in which a nonwoven fabric is impregnated with a sol made of a water-soluble organic compound (see Patent Document 1, etc.), or a water pad in which a sponge or foam is impregnated with water (Patent Document 2) Etc.) have been proposed.

  However, these are non-woven fabrics (Patent Document 1), sponges or foams (Patent Document 2) that are not fixed, and are impregnated with the sol (Patent Document 1) Depending on the weight of water (Patent Document 2) impregnated in the sponge or foam, the non-woven fabric (Patent Document 1) or the sponge or foam (Patent Document 2) may be displaced from a predetermined position, or the nonwoven fabric (Patent Document 1) or sponge. Or the sol (patent document 1) and the water (patent document 2) in the foam (patent document 2) are biased.

  In particular, in Patent Document 2, since water with extremely low viscosity is filled in a sponge or foam, the water retention in the sponge or foam is poor, and when body pressure is applied, When the water moves to other than the part, the unevenness of the water in the sponge or the foam occurs, and the usability is deteriorated.

  Therefore, in order to solve this problem, Patent Document 3 uses a hydrogel as a pad and seals the inside of the flat bag body. At this time, the film or sheet constituting the flat bag body is sealed. In addition to the peripheral portion, there is a description in which an appropriate portion of the flat bag body is joined to form a joined portion that suppresses the movement and bias of the hydrogel.

However, the gel as used in Patent Document 3 has good shape retention, but when concentrated pressure is applied to one point, there is a problem that the portion to which the pressure is applied is easily torn. Moreover, when it is torn, the torn part is not restored, and the part has no cooling effect. In some cases, the split gels overlap with each other, resulting in a problem that the feeling of use as a pad is lowered. Moreover, even if the said junction part is formed, when the gel near a junction part is torn, the function as a junction part is not exhibited, but there exists a problem which a movement and bias | deviation of a gel arise.
Registered Utility Model No.3054298 JP 2007-75619 A JP 2002-233442 A

  The present invention has been made to solve such a problem, and when the pad is tilted, the polyurethane foam does not deviate due to the weight from a predetermined position in the pad, and is concentrated on one point of the pad. It is an object of the present invention to provide a pad having a cooling function that is not affected by tearing or the like even if a large pressure is applied, is familiar with the human body, has an excellent feeling of use, and can suitably impart a cooling effect to the human body.

  The present invention is a pad having a sheet material on the front and back surfaces of a polyurethane foam having a thickness of 4 to 12 mm, the outer edge of the sheet material being joined, and sealing the polyurethane foam. The polyurethane foam has a viscosity of 30 to 600 cps. The gist of the present invention is a cold pad characterized in that the solution is impregnated in a volume of 70 to 120% of the volume of the polyurethane foam, and the polyurethane foam is fixed in the pad by a fixing means.

  In this way, when the pad is tilted, not only does it prevent the polyurethane foam impregnated with the solution from shifting from its predetermined position, but the polyurethane foam can be used even if concentrated pressure is applied to one point of the pad. Since it is used, there is no effect of tearing, etc., and the solution allows the human body to become familiar with it, has an excellent feeling of use, and can suitably impart a cooling effect to the human body.

  In addition, as a fixing means, it is preferable to provide a through-hole in at least one part of the polyurethane foam, and to join the upper and lower surfaces of the sheet material at that part. In this method, the polyurethane foam is not directly fixed to the sheet material. When the body pressure is applied, an excessive load is not applied to the polyurethane foam, and damage or the like is prevented.

  In addition, it is preferable that either woven fabric, knitted fabric, or non-woven fabric is laminated on at least one surface of the polyurethane foam, which improves the strength of the polyurethane foam compared to the case of using only the polyurethane foam. It can be made to.

  Furthermore, it is preferable that the polyurethane foam in the longitudinal direction of the pad is divided into at least two or more, and the upper and lower surfaces of the sheet material are preferably joined in the divided portion. The pad can be folded and has excellent handling properties such as carrying.

  The present invention is a pad which has a sheet material on the front and back surfaces of polyurethane foam, the outer edges of the sheet material are joined and the polyurethane foam is sealed, and the polyurethane foam is fixed in the pad by fixing means. When tilting, the polyurethane foam impregnated with the solution can be prevented from being displaced from the specified position, and even if intensive pressure is applied to one point of the pad, the polyurethane foam is used. Therefore, the cooling effect can be suitably imparted to the human body. In the present invention, the polyurethane foam is impregnated with a solution having a viscosity of 30 to 600 cps at a volume of 70 to 120% of the volume of the polyurethane foam and is maintained in the polyurethane foam. Even when the pad is tilted by the volume of the solution, the solution is not biased, and when the body pressure is applied to the pad, the pad is easy to adapt to the human body, has an excellent fit, and has an excellent feeling of use. is there. The cooling effect is obtained by the solution.

  Further, as a means for fixing the polyurethane foam in the pad, it is preferable to provide a through-hole in at least one part of the polyurethane foam, and to join the upper and lower surfaces of the sheet material at that portion. Since the foam is not directly fixed to the sheet material, when the body pressure is applied, the polyurethane foam is not excessively burdened, and the effect of preventing breakage and the like is exhibited.

  Moreover, it is preferable that any one of woven fabric, knitted fabric, and nonwoven fabric is laminated on at least one surface of the polyurethane foam, and the effect of improving the strength of the polyurethane foam as compared with the case of using only the polyurethane foam. It plays.

  Furthermore, the polyurethane foam in the longitudinal direction of the pad is divided into at least two parts, and it is preferable that the upper and lower surfaces of the sheet material are joined at the divided part, and the pad can be folded at the divided part. It is possible and has the effect of being excellent in handling properties such as carrying.

  Hereinafter, an embodiment of a pad of the present invention will be described with reference to a plan view of FIG. 1 and a cross-sectional view of FIG. 1 and 2 show a pad 1 having a cooling / heating function, 2 is a sheet material, 3 is a polyurethane foam impregnated with a solution, and 4 is a joint portion of the sheet material.

  The polyurethane foam (hereinafter referred to as foam) is preferably a hydrophilic foam from the viewpoint of easy impregnation of the solution. The hydrophilic foam is usually a polyol obtained by subjecting polyethylene oxide and ethylene oxide to ring-opening addition polymerization using glycerin or the like as an initiator, a foaming agent, a catalyst, a foam stabilizer and the like, and reacted with polyisocyanate. is there.

  The foam preferably has a hardness measured by a method according to method A of JIS K 6400 (1997) of 80 to 150 N. Within this range, the foam does not give a sense of incongruity and does not impair the feeling of use. It plays. However, in the case of less than 80N, the thinner the foam used, the lower the body pressure dispersibility due to the bottom, and the possibility of hindering the cooling effect. If it exceeds 150N, the hardness is felt and the feeling of use is impaired. This is not preferable because it may cause

  Further, the thickness of the foam is 4 to 12 mm, and if it is within this range, when impregnated with the solution, the feeling of use is excellent and a cooling effect can be effectively obtained.

  When the thickness of the foam is less than 4 mm, even if the solution is impregnated, the thickness is not sufficient, and there is a possibility that a sufficient cooling effect cannot be obtained. On the other hand, if the thickness of the foam exceeds 12 mm, the necessary amount of the solution to be impregnated increases, which not only increases the cost, but also becomes heavy and deteriorates in handling properties, or becomes too thick and uncomfortable. This is not preferable because the feeling may deteriorate.

  The sheet material for sealing the foam is not particularly limited as long as it is flexible and strong and can be broken during use and the solution does not leak.

  Examples of the sheet material include polyethylene, polypropylene, polyester, polyamide, polyvinyl chloride, polyvinylidene chloride, polyurethane, polystyrene, saponified ethylene-vinyl acetate copolymer, ethylene-vinyl acetate copolymer, natural rubber, recycled rubber, Synthetic rubber or the like can be used.

  In addition, the sheet material may be a laminate of two or more layers depending on the purpose. However, in selecting the material, a material having high frequency fusion property and low moisture permeability is preferable.

  The thickness of the sheet material is preferably 0.05 to 0.4 mm. If the thickness is within this range, the sheet material is excellent in flexibility and strong, and there is no risk that the solution will be broken during use.

  When the thickness is less than 0.05 mm, it becomes difficult to make the thickness uniform at the time of molding, and it is not strong as a sheet material, and it breaks during use, so that the solution leaks or the quality is not stable. This is not preferable because of fear. On the other hand, when the thickness exceeds 0.4 mm, the flexibility is lowered, the conformability to the pad surface is remarkably lowered, the followability to the deformation of the pad surface is lowered, and the texture is stiff and poor. This is not preferable.

  The shape of the sheet material is not particularly limited, and may be set as appropriate depending on the purpose and application of use. For example, a rectangular shape or a substantially rectangular shape is preferable, and in addition, a square, a substantially square, or an oval shape is preferable. Various shapes such as a substantially elliptical shape, a circular shape and a substantially circular shape can be preferably used.

  The solution to be impregnated into the foam has a viscosity of 30 to 600 cps, and by making it within this range, the workability of impregnation into the foam and the water retention effect after the impregnation are improved, and further, the body pressure is applied to the pad. When applied, the pad is easy to adjust to the human body, can provide a fit, and is excellent in use feeling. The viscosity is the same as that of B type viscometer (Tokimec Co., Ltd.) Measurements were taken at 2 rotors x 30 rpm.

  When the viscosity is less than 30 cps, the water retention capacity of the foam is weakened, and when the body pressure is applied to the pad, the solution impregnated in the foam moves in addition to the body pressure portion, and the solution in the foam is biased. There is a risk of worsening the feeling. In addition, when the pad is tilted, the solution may be unevenly distributed in the foam due to the weight of the solution, which is not preferable.

  On the other hand, when the viscosity exceeds 600 cps, it is difficult to impregnate the foam into the foam, and productivity may be deteriorated.

  Furthermore, the solution is impregnated with a volume of 70 to 120% of the volume of the foam. By making this range, not only a sufficient cooling effect by the solution can be obtained, but also the usability is excellent, The effect which is excellent also in the handleability is produced.

  When the volume is less than 70% of the volume of the foam, the solution is not impregnated in the entire foam, and a sufficient cooling effect may not be obtained. On the other hand, if the volume exceeds 120% of the volume of the foam, the solution that is not impregnated in the foam brings about a floating feeling, which deteriorates the feeling of use and is also unfavorable due to concerns about deterioration in handling properties such as carrying.

  In addition, it is preferable to use the said solution in which foam, sheet | seat material, and the cover body mentioned later are insoluble, and what has fluidity | liquidity in water systems, such as water and a water-soluble solvent, is preferable. Further, in order to obtain the viscosity of the present invention, a hydrophilic polymer or a hydrophobic polymer to which viscosity is imparted may be added.

  Examples of the water-soluble solvent include alcohols such as methanol, ethanol and propanol, and these can be used in combination of two or more.

  Examples of hydrophilic polymers include gelatin or gelatin derivatives, polyvinyl alcohol or polyvinyl alcohol derivatives, polyvinyl pyrrolidone, polyethylene oxide, polyacrylamide, styrene maleic anhydride copolymer, carboxymethyl cellulose, hydroxyethyl cellulose, starch or starch derivatives, color ginnan, gum arabic. , Pullulan and the like, and two or more of these can be used in combination.

  Examples of the hydrophobic polymer include paraffin wax, and these can be used in combination of two or more.

  The solution may contain a surfactant, an antiseptic / antifungal agent, an antifreezing agent, an antioxidant, and the like as necessary.

  Surfactants include higher fatty acid soaps, alkyl sulfate esters, polyoxyethylene alkyl ether sulfates, acyl N-methyl taurate salts, alkyl ether phosphate esters and N-acyl amino products, alkyl chlorides, etc. Cationic surfactants such as trimethylammonium chloride, dialkyldimethylammonium chloride and benzalkonium chloride, amphoteric surfactants such as alkyldimethylaminoacetic acid betaine, alkylamidodimethylaminoacetic acid betaine and 2-alkyl-N-hydroxyimidazolium betaine, Nonionic surfactants such as polyoxyethylene type and polyhydric alcohol ester type and ethylene oxide / propylene oxide block copolymers, or polymer surfactants such as sorbitan monolaurate, natural world Active agents.

  Preservatives and fungicides include paraoxybenzoates (parabens), 2-phenoxyethanol, benzoic acid and its salts, salicylic acid and its salts, sorbic acid and its salts, dehydroacetic acid and its salts, p-toluenesulfonic acid and Its salts, alcohols such as ethanol and isopropanol, quaternary ammonium salts such as benzalkonium chloride, etc. and polyhydric alcohols that are antiseptic materials, medium chain fatty acids and esters thereof, glycerol derivatives, and EDTA And the like.

  Examples of the antifreezing agent include ethylene glycol, propylene glycol, glycerin, urea and the like.

  Antioxidants include naphthylamine, diphenylamine, p-phenylenediamine, quinoline, hydroquinone derivatives, monophenols, polyphenols, thiobisphenols, hindered phenols, and the like.

  In the pad of the present invention, the foam is first cut into a required shape, and the sheet material having a size sufficient to seal the cut foam is set on the front and back surfaces of the cut foam, and the outer edge of the cut foam It is preferable that the upper and lower surfaces of the sheet material are joined by thermal fusion, high frequency fusion, adhesion, or the like along the portion, and may be formed from one sheet material instead of two sheet materials. At this time, in order to put the solution into the formed pad, it is necessary to provide an opening of a size that allows at least the solution to be put in the outer edge of the pad. In addition, although the joining width in the outer edge part of the sheet material as shown by a in FIG. 1 is not particularly limited, 3 to 50 mm is a preferable range. However, if the length is less than 3 mm, the durability of the joint is insufficient, and there is a risk of peeling when using the pad. If the thickness exceeds 50 mm, the production workability is deteriorated, and the use of the pad of the present invention may cause uncomfortable feelings due to contact of the joined portion of the sheet material more than necessary.

  The present invention further includes means for fixing the foam in the pad so that the foam impregnated with the solution does not shift from a predetermined position in the pad due to its weight when the pad is tilted. Various methods can be adopted as the means. As the method, for example, a method of providing a through-hole in at least one location of the foam and joining the upper and lower surfaces of the sheet material at that portion is preferable, and this method is because the foam is not directly fixed to the sheet material. When pressure is applied, an excessive load is not applied to the foam, and damage is prevented.

  As described above, another form of the method for fixing the foam in the pad has an effect when the foam is impregnated with the above solution, such as a two-component curable adhesive or a hot-melt adhesive. A method of adhering and fixing the foam to the sheet material using an adhesive that does not receive the adhesive, a method of connecting and fixing the foam and the sheet material with a connecting member such as a thread, Although the method etc. which are partially fixed with a double-sided adhesive tape are mentioned, As a fixing means, it is not limited to these. However, in order to fully exhibit the characteristics of the foam, it is preferable not to fix the foam directly to the sheet material with an adhesive or the like.

  As a means for fixing the foam in the pad, when a method is adopted in which a through hole is provided in at least one part of the foam and the upper and lower surfaces of the sheet material are joined at that portion, the shape of the through hole is particularly limited. Although not set, it can be set in consideration of the size of the pad, the overall design, etc., for example, a circle or an ellipse.

  In addition, since the upper and lower surfaces of the sheet material are joined at the portion of the through hole provided in the foam, the portion of the pad is depressed in appearance. Therefore, it is excellent in design as a pad and is preferable in terms of design.

  Further, the number and size of the through holes provided in the foam are not particularly limited, and can be appropriately set depending on the size of the pad to be manufactured. Regarding the number of through holes, for example, when used as a bed pad, at least 4 or more are provided, and when used as a pillow pad, it is preferable to provide at least 2 or more. Sufficient to fix the foam, and less than these numbers is insufficient to fix the foam. In addition, regarding the size of the through holes, it is preferable that the total size of all the through holes is provided in a range of 1 to 10% in the total area of the upper surface of the foam, and in the case of less than 1%, the foam is fixed. If the content exceeds 10%, the area of the foam is decreased, and the cooling effect and cushioning properties may be insufficient.

  Also, the position of the through hole provided in the foam is not particularly limited, and can be set as appropriate depending on the size of the pad to be manufactured, but the through hole is provided inside the foam other than the end. For example, when used as a bed pad, it is preferably 5 to 35 cm from the foam end, and when used as a pillow pad, it is preferably 5 to 25 cm from the foam end. If it is provided, the foam can be fixed effectively, but if it is smaller than these ranges, the foam is not fixed effectively. If it is larger than these ranges, the foam end fixing effect is not effective. This is not preferable because it may decrease.

  Also, when this method is adopted, by providing a through hole inside the periphery of the part where the upper and lower surfaces of the sheet material in the through hole are joined, air can be passed through the through hole and used as a pad. In this case, air permeability can be ensured, and the effect of alleviating skin heat can be achieved.

  Moreover, for the purpose of reinforcing the foam, it is preferable to previously laminate one of a woven fabric, a knitted fabric and a non-woven fabric on at least one surface of the foam. As a lamination method, a two-component curable adhesive, a hot melt adhesive, or the like is laminated using an adhesive that is not affected when the foam is impregnated with the solution, a frame lamination method, or the like. It is laminated by a known lamination method.

  As the woven fabric, knitted fabric, non-woven fabric, a kind selected from nylon, vinylon, polyester, rayon, acetate, acrylic, polyethylene, polypropylene, polyvinyl chloride and other natural fibers, cotton, hemp, silk and other natural fibers or It is preferable to use two or more kinds of materials.

Further, the basis weight when laminating the woven fabric, the knitted fabric, and the nonwoven fabric on the foam is not particularly limited, but specifically, 15 to 50 g / m ² is preferable. The foam can be suitably reinforced.

When the weight per unit area is less than 15 g / m ² , when laminating the foam, problems in laminating processing due to the leaching of the adhesive and reinforcement of the foam become insufficient, and the required strength cannot be obtained. This is not preferable because of fear. On the other hand, if the weight per unit area exceeds 50 g / m ² , not only is the cost high, but the flexibility of the foam may be hindered and the feeling of use may be deteriorated.

  Thereafter, the solution is poured into the pad from the provided opening, the foam in the pad is almost uniformly impregnated with the solution, and then the heat provided, the high frequency fusion, the adhesion, and the like are provided. To seal the pad. The term “sealing” in the present invention does not mean that the inside of the pad is evacuated but the foam is in a normal state so that the solution does not leak out of the pad.

  Through the above process, the pad of the present invention is obtained, and the foam is fixed in the pad. Therefore, when the pad is tilted, displacement from a predetermined position due to the weight of the foam impregnated with the solution is prevented. Even if intensive pressure is applied to one point of the pad, since the foam is used, there is no influence of tearing or the like, and a cooling effect can be suitably imparted to the human body. Further, since the foam is impregnated with a solution having a viscosity of 30 to 600 cps in a volume of 70 to 120% of the volume of the foam and kept in the foam, when the body pressure is applied to the pad, the pad is applied to the human body. It is easy to get used to, has a good fit, and has an excellent feeling of use.

  In addition, it is preferable that the pad is covered and sealed with a cover body made of a sheet material. In this way, not only can the pad be protected, but even if the sheet material forming the pad is broken, the pad is protected. Is covered and sealed by the cover body, so that the solution does not leak outside the cover body. In addition, by covering with a cover body, there is an effect of adding decorativeness and reducing moisture permeability.

  As a method of enclosing and sealing the cover body in the pad, it is preferable to join the outer edge portion and the like together with the sheet material forming the pad by heat fusion, high frequency fusion, adhesion, etc. It is preferable to carry out after charging. As a means for fixing the foam, when a method is adopted in which a through hole is provided in at least one part of the foam and the upper and lower surfaces of the sheet material forming the pad are joined at that portion, the cover body is made of the through hole. After integrally bonding to the sheet material forming the pad of the part, by providing a through hole inside the periphery of the bonded part, air can be passed through the through hole, and air permeability when used as a pad Can be ensured, and the effect of relieving steaminess can be achieved.

  Further, the sheet material forming the cover body is not particularly limited as long as it is flexible and strong and does not leak the solution. However, like the sheet material forming the pad, the sheet material has high frequency fusion properties. In addition, a material having low moisture permeability is preferable, and polyvinyl chloride, ethylene-vinyl acetate copolymer, or the like can be used.

  As thickness of the sheet material which forms a cover body, 0.05-0.2 mm is preferable, if it is this range, sufficient intensity | strength as a cover body will be obtained, and there exists a possibility of inhibiting a thermal effect and usability | use_condition. Absent.

  When the thickness is less than 0.05 mm, it is not preferable because the original function of the cover body may be impaired due to insufficient strength as the cover body. On the other hand, if the thickness exceeds 0.2 mm, it is not preferable because the cooling effect of the pad and the texture become hard, which may impair the feeling of use.

  The cover body has not only protection of the pad but also the purpose of decoration. When the purpose of decoration is taken into consideration, the surface layer is made of artificial fibers such as polyester, nylon and acrylic, and natural fibers such as cotton and silk. Any one of woven fabrics, knitted fabrics, and nonwoven fabrics composed of one or two or more selected from fibers can be suitably used.

  In the present invention, as in the embodiment of FIG. 3, the foam in the length direction of the pad is divided into at least two, and the upper and lower surfaces of the sheet material forming the pad are joined at the divided portion. It is preferable. Note that the entire width direction of the pad of the divided portion may be bonded. However, when appropriate portions in the width direction of the pad of the divided portion are bonded, the foam is impregnated between the divided foams. The solution can be moved back and forth, and is not affected by the state of body pressure, and does not impair the feeling of use.

  Moreover, when providing a cover body, it joins with the sheet | seat material which forms a pad.

  By doing so, it is possible to fold the pad at the divided portion, and the handleability is excellent, which is a preferable mode.

Next, although the Example and comparative example of this invention are explained in full detail, this invention is not limited to this. In the following examples and the like, the following measurement methods and evaluation methods are used.
(1) Measurement of viscosity No. of B-type viscometer (Tokimec Co., Ltd.) Measurements were taken at 2 rotors x 30 rpm.
(2) Measurement of hardness Measured in accordance with method A of JIS K 6400 (1997).
(2) Prevention of foam displacement ○: The foam did not deviate from a predetermined position when tilted.
X: The foam was displaced from a predetermined position when tilted.
(3) Load on foam ○: When body pressure was applied to the pad, the load on the foam was extremely low.
Δ: When body pressure was applied to the pad, the burden on the foam was low.
(4) Pad fit feeling ○: When body pressure was applied to the pad, the pad was familiar to the human body, excellent fit, and excellent usability.
Δ: When body pressure was applied to the pad, the pad was slightly familiar to the human body, had a fit, and had a slightly better feeling of use.
X: When body pressure was applied to the pad, the pad did not conform to the human body, there was no fit, and the usability was deteriorated.
(5) Cooling effect (circle): There was a cooling effect at the time of pad use.
X: There was no cooling effect when using the pad.
(6) Ease of impregnation of solution ○: The solution was easy to impregnate the foam.
Δ: The solution was slightly difficult to impregnate the foam.
X: It was difficult for the solution to impregnate the foam, and the productivity deteriorated.
(7) Handling property (circle): There was no problem in handling property.
X: It was very heavy as a pad, and there was a problem in handleability.
Example 1
(A) As a hydrophilic foam, the product name JM manufactured by Achilles Co., Ltd. is used. This foam has a thickness of 7 mm, a length of 83.6 cm × a width of 36.8 cm, and a hardness of 100 N. Further, as shown in FIG. 1, the foam is located at the center of the foam in the vertical direction and at a portion 22.5 cm from the center to the left and right in the vertical direction, and 10 from the center of the foam in the horizontal direction to the left and right in the horizontal direction. A through hole having a diameter of 4 cm was provided in a total of six locations, 0.0 cm apart.
(B) Pad before solution impregnation A non-porous sheet made of EVA having a thickness of 0.2 mm, a length of 90.0 cm × width of 40.8 cm is set on the front and back surfaces of the foam obtained in (a), In the outer edge part of the foam and the provided through hole part, the two sheets are overlapped so that the EVA non-porous sheets overlap each other, and the outer edge part and the provided through hole part are subjected to high frequency fusion bonding, thereby providing a pad. Obtained. At this time, the pad was not completely sealed, and a part of the opening was provided.
(C) Pad after solution impregnation A solution with a volume of 95% of the volume of the foam obtained in (a) above is introduced from the opening of the pad obtained in (b) above, and the foam is uniformly formed by a roll or the like. After impregnating and venting the inside, the opening was sealed by high frequency fusion to obtain the pad of the present invention.

  In addition, the said solution is a composition of Table 1, as a hydrophilic polymer, the brand name "Sunfresh ST-500D" by a sun diamond polymer company, and as a preservative and antifungal agent, the brand name "San Ibakku FX" by Sanai Oil Co., Ltd. Was used. The viscosity of the solution was 75 cps.

Example 2
In Example 1, a pad of the present invention was obtained in the same manner as in Example 1 except that the foam was not provided with a through hole and one surface of the foam was fixed to the sheet material using an adhesive. In addition, Dainippon Ink Chemical Co., Ltd. brand name "Crisbon 4010" was used as the adhesive, and Nippon Polyurethane Industry brand name "Coronate L" was used as the crosslinking agent.
Example 3
In the same manner as in Example 1, except that a solution having a volume of 75% of the volume of the foam obtained in (a) was introduced from the opening of the pad obtained in (b) of Example 1. I got a pad.
Example 4
In the same manner as in Example 1, except that a solution having a volume of 115% of the volume of the foam obtained in (a) was introduced from the opening of the pad obtained in (b) of Example 1. I got a pad.
Example 5
A pad of the present invention was obtained in the same manner as in Example 1 except that the thickness of the foam in (a) of Example 1 was changed to 5 mm.
Example 6
A pad of the present invention was obtained in the same manner as in Example 1 except that the thickness of the foam in Example 1 (a) was 10 mm.
Example 7
The composition of Table 1 in Example 1 (c) was the same as that of Example 1 except that the amount of the hydrophilic polymer was 0.2 parts by weight and the viscosity of the solution was 40 cps. I got a pad.
Example 8
The composition of Table 1 in Example 1 (c) was the same as that of Example 1 except that the amount of the hydrophilic polymer was 0.4 parts by weight and the viscosity of the solution was 400 cps. I got a pad.
Example 9
A pad of the present invention was obtained in the same manner as in Example 1 except that the foam hardness in Example 1 (a) was 85N.
Example 10
A pad of the present invention was obtained in the same manner as in Example 1 except that the foam hardness in Example 1 (a) was 140 N.
Example 11
In Example 1 (a), instead of the hydrophilic polyurethane foam, a hydrophobic polyurethane foam having a thickness of 7 mm, a length of 83.6 cm × a width of 35.2 cm, and a hardness of 100 N (trade name “VD” manufactured by Achilles) A pad of the present invention was obtained in the same manner as Example 1 except that was used.
Example 12
A pad of the present invention was obtained in the same manner as in Example 1 except that the foam hardness in Example 1 (a) was changed to 50N.
Example 13
A pad of the present invention was obtained in the same manner as in Example 1 except that the foam hardness in (a) of Example 1 was changed to 200N.
Comparative Example 1
A pad of the present invention was obtained in the same manner as in Example 1 except that the foam obtained in (a) of Example 1 was not provided with a through hole.
Comparative Example 2
In the same manner as in Example 1, except that a solution having a volume of 60% of the volume of the foam obtained in (a) was introduced from the opening of the pad obtained in (b) of Example 1. I got a pad.
Comparative Example 3
In the same manner as in Example 1, except that a solution having a capacity of 140% of the volume of the foam obtained in (a) was introduced from the opening of the pad obtained in (b) of Example 1. I got a pad.
Comparative Example 4
A pad of the present invention was obtained in the same manner as in Example 1 except that the thickness of the foam in (a) of Example 1 was changed to 2 mm.
Comparative Example 5
A pad of the present invention was obtained in the same manner as in Example 1 except that the thickness of the foam in Example 1 (a) was 20 mm.
Comparative Example 6
The composition of Table 1 in Example 1 (c) was the same as that of Example 1 except that the amount of the hydrophilic polymer was 0.1 parts by weight and the viscosity of the solution was 15 cps. I got a pad.
Comparative Example 7
The composition of Table 1 in Example 1 (c) was the same as that of Example 1 except that the amount of the hydrophilic polymer was 0.5 parts by weight and the viscosity of the solution was 1000 cps. I got a pad.
Comparative test The results of the comparative test are summarized in Tables 2-4. In Examples 1 to 13, since the foam is fixed in the pad, when the pad is tilted, it does not shift from a predetermined position due to the weight of the foam impregnated with the solution. Could be used. In Examples 1 to 3 to 13, in which the foam is not directly fixed to the sheet material, when the body pressure is applied compared to Example 2 in which the foam is directly fixed to the sheet material, This burden was low.

  In addition, the pads of Examples 1 to 10, when the body pressure is applied to the pad by the solution impregnated in the foam, the pad is easy to adjust to the human body, excellent fit, and excellent use feeling. A cooling effect was obtained effectively. Furthermore, the foam was easily impregnated with the solution, and the handling was excellent.

  Since the pad of Example 11 used hydrophobic polyurethane foam, it was difficult to impregnate the solution, but there was no problem in using the pad of the present invention.

  The pad of Example 12 had a low foam hardness and had a slight bottom feeling, which hindered the feeling of use, but there was no problem in using the pad of the present invention.

  The pad of Example 13 has a high foam hardness, feels somewhat hard, impairs the feeling of use, and it was difficult to impregnate the foam with the solution. However, there was a problem with the use of the pad of the present invention. There was no.

  On the other hand, the pad of Comparative Example 1 does not have a through-hole in the foam, and the foam is not fixed in the pad. Therefore, when the pad is tilted, the foam is impregnated at a predetermined position depending on the weight of the foam impregnated with the solution. I got out of order.

  In the pad of Comparative Example 2, the amount of the solution impregnated in the foam was small, and the cooling effect was not obtained.

  In the pad of Comparative Example 3, the amount of the solution impregnated in the foam was large, and the solution not impregnated in the foam caused a floating feeling, deteriorated the feeling of use, and became heavy and lacked in handleability.

  In the pad of Comparative Example 4, the foam thickness was insufficient, which not only hindered the feeling of use, but even when impregnated with the solution, a cooling effect could not be obtained.

  Since the pad of Comparative Example 5 was thick in foam, the amount of the solution to be impregnated was large, and the pad became heavy, resulting in a decrease in handleability and an uncomfortable feeling, which hindered the feeling of use.

  Since the pad of Comparative Example 6 has a low viscosity of the solution, water retention in the foam is weakened, and when the body pressure is applied to the pad, the solution impregnated in the foam moves in addition to the body pressure portion. As a result, the solution was biased and the usability was deteriorated. In addition, when the pad was tilted, the solution was uneven in the foam.

  Since the pad of Comparative Example 7 had a high viscosity of the solution, it was difficult to impregnate the foam and the productivity deteriorated.

The top view which shows the cooling-heat pad of one Embodiment of this invention Sectional view in AA of FIG. The top view which shows the thermal pad of other embodiment of this invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cooling pad 2 Sheet material 3 Polyurethane foam impregnated with solution 4 Joining part a in sheet material Joining width in outer edge part of sheet material

Claims (4)

  It is a pad having a sheet material on the front and back surfaces of a polyurethane foam having a thickness of 4 to 12 mm, the outer edges of the sheet material being joined, and the polyurethane foam being sealed, and the polyurethane foam has a solution with a viscosity of 30 to 600 cps. A cold pad, impregnated with a volume of 70 to 120% of the volume of the foam, wherein the polyurethane foam is fixed in the pad by fixing means.   The cooling / heating pad according to claim 1, wherein the fixing means is provided with a through hole in at least one place of the polyurethane foam, and the upper and lower surfaces of the sheet material are joined to the fixing hole.   The cold / heat pad according to claim 1, wherein any one of a woven fabric, a knitted fabric, and a non-woven fabric is laminated on at least one surface of the polyurethane foam.   The polyurethane foam in the longitudinal direction of the pad is divided into at least two, and the upper and lower surfaces of the sheet material are joined at the divided portions. Cold heat pad.

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