Mattress cover and mattress

Abstract

To provide a mattress cover capable of preventing moisture or pollutant from entering inside a mattress from a hole of seam for attachment of a fastener or the like.SOLUTION: A mattress cover 2 includes a waterproof fastener 5, and includes a welding part 12 in which a mattress cover material 14 forming the mattress cover 2 is welded with a fastener tape part 7 of the waterproof fastener 5. The mattress cover material 14 is formed by a thermoplastic polyurethane resin sheet. The welding part 12 is a welding part formed by ultrasonic welding.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a mattress cover and a mattress using a waterproof zipper. [Background technology]

[0002] Conventionally, various mattresses with a zipper on the mattress cover have been sold, as shown in Patent Document 1. Also disclosed is a mattress that uses a waterproof zipper as such a zipper. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Utility Model Registration No. 3185181 Summary of the Invention [Problem to be solved by the invention]

[0004] Generally, when waterproof zippers are attached to mattress covers, they are attached by sewing, so if a drink is spilled or moisture such as urine or sweat gets in through the seams (perforations) of the mattress cover, the moisture can get into the mattress, or the components in that moisture can get inside and contaminate the mattress. Furthermore, the method of sewing synthetic leather onto the surface of a mattress necessitates the need to sew holes into the sheet material, which creates the problem that if moisture-containing liquids such as urine or sweat adhere to the stitching, they can seep into the mattress.

[0005] The present invention has been made to solve the above problems. An object of the present invention is to provide a mattress cover and a mattress that can prevent moisture and contaminants from entering the inside of the mattress through holes such as stitches for attaching zippers. [Means for solving the problem]

[0006] The mattress cover according to the first aspect of the present invention is A mattress cover using a waterproof zipper, The mattress cover is characterized in that the mattress cover material constituting the mattress cover has a welded portion where it is welded to the fastener tape portion of the waterproof fastener.

[0007] A second aspect of the present invention is the mattress cover according to the first aspect, The mattress cover material is made of a thermoplastic polyurethane resin sheet, and the welded parts are formed by ultrasonic welding.

[0008] A third aspect of the present invention is the mattress cover according to the second aspect, The welded portion is characterized in that a thermoplastic polyurethane resin sheet serving as an intermediate layer is interposed between the thermoplastic polyurethane resin sheet, which is the mattress cover material, and the fastener tape portion.

[0009] A fourth aspect of the present invention is the mattress cover according to the third aspect, The intermediate layer extends toward the center beyond the welded portion and covers the fastener tape portion.

[0010] A mattress according to a fifth aspect of the present invention is a mattress component made of an elastically deformable and compressible member; a mattress surface sheet that covers the surface of the mattress component, The mattress surface sheet has a welded portion welded to the fastener tape portion of the waterproof fastener.

[0011] A sixth aspect of the present invention is the mattress according to the fifth aspect, The mattress surface sheet is made of a thermoplastic polyurethane resin sheet, and the welded portion is formed by ultrasonic welding.

[0012] A seventh aspect of the present invention is the mattress according to the sixth aspect, The welded portion is characterized in that a thermoplastic polyurethane resin sheet serving as an intermediate layer is interposed between the thermoplastic polyurethane resin sheet serving as the mattress surface sheet and the fastener tape portion.

[0013] An eighth aspect of the present invention is the mattress according to the seventh aspect, The intermediate layer extends toward the center beyond the welded portion and covers the fastener tape portion. [Effects of the Invention]

[0014] The present invention can provide a mattress cover and a mattress that can prevent moisture and contaminants from entering the mattress through holes such as stitches for fastener attachment. [Brief explanation of the drawings]

[0015] [Figure 1] 1 is a perspective view showing a mattress having a mattress cover according to an embodiment of the present invention. [Figure 2] FIG. 2 is a perspective view showing a mattress having a mattress cover according to the present embodiment from a different direction. [Figure 3] FIG. 1(a) is a plan view showing the structure of a waterproof zipper, and FIG. 1(b) is a vertical cross-sectional view taken along line bb in FIG. [Figure 4] FIG. 4 is a vertical cross-sectional view taken along line IV-IV in FIG. [Figure 5] FIG. 2 is a perspective view showing the side portion of the mattress cover with the handle portion attached. [Figure 6] FIG. 10 is a perspective view of a mattress according to another embodiment of the present invention. [Figure 7] FIG. 10 is a partial perspective view of the mattress showing the air vent openings provided in the side sheet portions in a closed state. [Figure 8]FIG. 10 is a partial perspective view of the mattress showing the air vent openings in the side sheet portions open and air escaping. [Figure 9] FIG. 10 is a perspective view of a mattress according to another embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0016] Hereinafter, the mattress cover and mattress according to the present invention will be described in detail with reference to the drawings. [First embodiment] The first embodiment is an embodiment relating to a configuration in which a waterproof fastener 5 is attached to a mattress cover 2. Figure 1 is a perspective view of a mattress covered with a mattress cover, seen from the side with a waterproof zipper; Figure 2 is a perspective view of a mattress covered with a mattress cover, seen from the side with a handle; Figure 3(a) is a plan view showing the connection structure between the waterproof zipper and the mattress cover material; Figure 3(b) is a vertical cross-sectional view showing the connection structure; and Figure 4 is a vertical cross-sectional arrow view of the welded portion.

[0017] In the description of the mattress cover 2 of this embodiment shown in Figures 1 to 3, the front-to-back direction (longitudinal direction) is the direction in which the linear waterproof fasteners 5 extend. The lateral direction (left-to-right direction) is the direction perpendicular to the front-to-back direction in a plan view in Figure 3. The thickness direction is the direction perpendicular to the surface of the waterproof fasteners 5. The attachment direction of the waterproof fasteners 5 to the mattress cover 2 is often set in the head-to-foot direction of the mattress 1 or in the width direction of the mattress. However, the attachment direction of the waterproof fasteners 5 is set appropriately depending on the shape and use of the mattress 1, etc.

[0018] The mattress 1 shown in Figure 1 is rectangular in plan view, and waterproof zippers 5 are provided on the mattress cover 2 at positions corresponding to the vertical side surface portions 3 and horizontal side surface portions 4 of the mattress 1. In the configuration shown in Figure 1, the waterproof zipper 5 is formed by connecting waterproof zippers 5 provided on one surface portion of the opposing vertical side surface portions 3 and one surface portion of the opposing horizontal side surface portions 4 in a substantially L-shape.

[0019] The waterproof zipper 5 is provided at approximately the center in the vertical direction of the vertical side surface portion 3 and the horizontal side surface portion 4. As shown in Figure 2, a plurality of handle portions 17 are provided in the front-to-rear direction on the vertical side surface portion 3 opposite the vertical side surface portion 3 on which the waterproof zipper 5 is provided. The configuration of the handle portions 17 will be described later.

[0020] As shown in FIGS. 1 and 2, the mattress cover 2 is made of a synthetic resin material that covers the mattress component 6. A thermoplastic polyurethane sheet is preferably used as the material for forming the mattress cover 2. Materials other than the thermoplastic polyurethane sheet include, for example, polypropylene, polyethylene, polyethylene terephthalate, and ethylene-vinyl acetate copolymer resin.

[0021] In particular, polyurethane resin sheets offer the advantages of being soft like rubber and having excellent tensile strength, abrasion resistance, elasticity, water resistance, and oil resistance. Thermoplastic polyurethane resin sheets are also preferred for welding.

[0022] Examples of thermoplastic polyurethane resins include polyurethane elastomers obtained by polyaddition reaction of raw materials such as polyester-based, adipate-based, polyether-based, and polycaprolactone-based long-chain polyols, short-chain polyols, and diisocyanates via urethane bonds in the molecule. Examples of long-chain polyols include polyethylene glycol and polypropylene glycol, examples of short-chain polyols include ethylene glycol, 1,4-butanediol, and 1,4-hexanediol, and examples of diisocyanates include tolylene diisocyanate, 4,4'-diphenylmethane diisocyanate, and hexamethylene diisocyanate.

[0023] Such thermoplastic polyurethane elastomers preferably have a softening temperature of 150° C. to 190° C. If the softening temperature is less than 150° C., the amount of adhesion will be small and the peel strength will be weak. On the other hand, if the softening temperature is more than 190° C., the amount of adhesion will be large, causing tears and holes, and the strength will not be maintained.

[0024] A preferred example of a resin composition containing at least 40% by weight of a thermoplastic polyurethane resin is a composition having the following composition: A thermoplastic polyurethane resin composition comprising: (a) 40 to 70% by weight of a thermoplastic polyurethane resin; (b) 10 to 25% by weight of an ethylene-propylene-diene copolymer; (c) 10 to 25% by weight of a low-density polyethylene resin; (d) 5 to 20% by weight of a modified styrene-based elastomer modified with an unsaturated carboxylic acid or a derivative thereof, the styrene content of which is 30% by weight or less; and (e) 0 to 20% by weight of a styrene-based elastomer.

[0025] The thermoplastic polyurethane resin (a) is selected from the above-mentioned thermoplastic polyurethane resins, and adipate-based polyurethane elastomers are particularly preferred. The (b) ethylene-propylene-diene copolymer used in the composition is a copolymer containing ethylene, propylene, and a diene compound. Examples of the diene compound include ethylidene norbornene, 1,4-hexadiene, and dicyclopentadiene. The ethylene-propylene-diene copolymer (EPDM) preferably has an ethylene content of 60 to 70 mol%, a propylene content of 30 to 40 mol%, and a diene compound content of 1 to 10 mol%. More preferably, the ethylene content is 62 to 66 mol%, the propylene content is 33 to 37 mol%, and the diene compound content is 3 to 6 mol%.

[0026] On the other hand, even though they are both polyurethane resins, thermosetting polyurethane resins have a structure in which the resin skeleton, made up of linked monomers, is chemically bonded to nearby polymer molecules via functional groups such as hydroxyl groups, methylol groups, glycidyl groups, and cycloaliphatic epoxy groups, forming a three-dimensional network structure, which presents a drawback in that the methods of heat treatment are limited.

[0027] The mattress component 6 is made of a compressible material such as elastically deformable, flexible hard or soft urethane foam. For example, it may be made of a rectangular, one-piece mattress, or may be made of a mattress divided into three sections in the vertical direction: a front mattress, a middle mattress, and a rear mattress. The mattress component 6 is not particularly limited as long as it is an elastically deformable member that constitutes the mattress 1.

[0028] Figure 3 is an enlarged plan view of a portion of the waterproof zipper 5. The waterproof zipper 5 has a pair of left and right element parts 8 that form a sealing line part 16 that can be opened and closed linearly, a slider part 10 that controls the element parts 8 between an open state and a closed state, a pull part 9 that allows the slider part 10 to be gripped with the fingers, and a pair of band-shaped fastener tape parts 7 (see Figure 3(b)) that extend in the front-to-rear direction on the outside of each of the pair of left and right element parts 8.

[0029] Figure 4 is a vertical cross-sectional view taken along line IV-IV in Figure 3(a), and the welded portion 12 is welded in a state where the fastener tape portion 7, the waterproof layer 15 of the fastener tape portion 7, the intermediate layer 13, and the mattress cover material 14 are laminated in this order from the lower mattress constituent portion 6 side. Generally, a waterproof fastener 7 is configured to have waterproof properties even in the element portion 8, and further has a waterproof layer 15 such as a water-repellent layer on the surface of the fastener tape portion 7, so that waterproof layer 15 is also depicted in Figure 4.

[0030] The waterproof zipper 5 according to this embodiment is a so-called linear zipper, in which the opening and closing portion extends linearly. As the waterproof fastener 5, various types of waterproof fasteners can be used as long as they are configured so that the outer region of the fastener tape portion 7 can be welded to the mattress cover material 14.

[0031] For example, a waterproof zipper can be used in which the fibers that make up the fastener tape portion 7 are waterproofed or water-repellent, or in which a waterproof coating is applied to the surface of the fastener tape portion 7. Such a waterproof coating can prevent water from entering the interior through gaps in the fastener tape portion 7. Such waterproof zippers are often made of waterproof materials such as polyurethane or polyvinyl chloride (PVC).

[0032] On the other hand, a waterproof fastener in which a waterproof layer 15 is laminated on the surface of the fastener tape portion 7 can also be used. This configuration often provides higher waterproof performance and durability than waterproof coatings. In this embodiment, the above-mentioned waterproof fasteners 5 are selected and used.

[0033] When a thermoplastic polyurethane resin is used as the material for the mattress cover material 14, it is preferable to use the same polyurethane-based material as the material for the fastener tape portion 7. Polyurethane resin has the highest peel strength after welding, but acrylic resin can also be welded depending on the required strength. However, when using acrylic resin, the adhesion strength after welding is about 30% to 40% lower than with polyurethane, making it difficult to achieve the desired results. As shown in FIG. 3(b), at least a region of width D extending from the left and right outer ends of the fastener tape portion 7 toward the inside is configured as a welded portion 12 with the mattress cover material 14.

[0034] The welding width D is preferably in the range of 10% to 30% of the total width of the fastener tape portion 7 in the left and right directions. The length of the welding width D is preferably 3 mm or more and 10 mm or less. A mattress cover material 14 is laminated on the fastener tape portion 7 via an intermediate layer 13 that is favorable for the weldability of the fastener tape portion 7. The intermediate layer 13 is formed so as to extend from the outside toward the center and cover the fastener tape portion 7. The width S from the inner edge of the mattress cover material 14 to which the intermediate layer 13 is laminated is preferably in the range of 0% to 10% of the left and right width of the fastener tape portion 7. The length of the width S is preferably 0 mm to 2 mm.

[0035] The purpose of inserting the intermediate layer 13 is to partially increase the film thickness, improve the welding strength with the fastener part, and make it less likely to leave compression marks when the outside of the mattress is gripped. It also serves the purpose of preventing tearing of the welding part even if the mattress is rubbed against the ground during transportation. In particular, when a thermoplastic polyurethane sheet 14 is used as the mattress cover material 14, the quality of welding can be improved by using a thermoplastic polyurethane sheet 13 of the same material as the intermediate layer 13.

[0036] The waterproof layer 15 deteriorates over time, but with the configuration of this embodiment, most of the fastener tape portion 7 is covered by the waterproof intermediate layer 13, thereby enhancing the waterproofness of the inherent waterproof fastener 7. The thickness of the intermediate layer 13 is preferably set to be 80 μm or more and 300 μm or less. By setting the thickness within this range, the operability of the slider portion 10 and the flexibility of the waterproof zipper 5 are not impaired.

[0037] As the welding process for forming the welded portion 12 according to this embodiment, ultrasonic welding is preferably employed. When ultrasonic welding is used, ultrasonic vibrations are used to weld at least the mattress cover material 14 to the outer region of the fastener tape portion 7. In experiments conducted by the inventors, when a thermoplastic polyurethane resin was used, good welding could not be achieved without using ultrasonic welding. In other words, when a thermoplastic polyurethane resin was used, normal heat sealing, which fuses the mattress cover material 14 and the fastener tape portion 7 at high temperatures, resulted in an insufficient melt amount, resulting in insufficient weld strength and the formation of microscopic holes, making it impossible to achieve a welding that maintained good waterproofing.

[0038] [Other configurations] In the mattress cover 2, the long side opposite to the side where the waterproof fastener 5 having the handle part 17 is located is made of a double mattress cover material 14, so that even if the handle part 17 is provided, it is difficult to tear by pulling or the like. 2 and 5, the handle portion 17 is made up of a cylindrical portion 19 formed by shaping the material of the handle portion 17 into a cylindrical shape, and both ends of the cylindrical portion 19 are folded inward at approximately right angles on the upper side to form a pair of approximately triangular folded portions 20, and then the base ends (not shown) of the pair of folded portions 20 are inserted inward from the upper and lower joints 21 of the mattress cover 2. The base ends of the folded portions 20 are configured to be fixed to the doubled mattress cover material 14.

[0039] With this configuration, even a heavy mattress 1 has the cylindrical portion 19, which reduces pain on the hand compared to a simple string- or band-shaped handle portion 17. In addition, the approximately triangular folded portion 20 improves the shape-maintaining function of the handle portion 17, which has the advantage of making the handle portion 17 easier to find and grasp.

[0040] In Figure 1, an example is shown in which the waterproof zipper 5 is configured in an L-shape across the vertical side surface portion 3 and the horizontal side surface portion 4 of the mattress 1, but a configuration in which the waterproof zipper 5 is provided around the entire periphery of the side surface portion can also be used. Furthermore, the position at which the waterproof zipper 5 is provided on the mattress cover 2 is not necessarily limited to a position corresponding to the side surface portion of the mattress 1.

[0041] [Second embodiment] In the first embodiment, the mattress 1 is described as an example in which the mattress cover 2 houses the mattress component 6, and the mattress cover 2 is detachable from the mattress component 6. However, the configuration of this embodiment can also be applied to a mattress surface sheet (not shown) of the mattress 1 that is not separated from the mattress component 6, instead of the mattress cover 2.

[0042] That is, the mattress 1 has a mattress component 6 made of an elastically deformable and compressible material, a mattress surface sheet (not shown) that covers the surface of the mattress component 6, and has a welded portion 12 where the mattress surface sheet is welded to the fastener tape portion 7 of the waterproof fastener 5. The location where the waterproof fastener 5 is provided on the mattress surface sheet and the use of the waterproof fastener 5 are determined depending on the type and use of the mattress 1 to be used. Even with such a mattress 1, adopting the configuration of this embodiment has the effect of improving waterproofness in the area where the waterproof fastener 5 is provided, so the configuration of the present invention can be applied to a mattress surface sheet having a waterproof fastener 5.

[0043] The configurations of the above embodiments can provide the following advantages. (a) Since there are no stitching holes, urine, sweat, etc. cannot get inside, making it hygienic. In addition, it can be used as a mattress cover or mattress that can be washed as needed.

[0044] (b) In a configuration where a waterproof zipper is attached by sewing, even if the sewing thread is made water-repellent, holes from the sewing needle are physically created, so if water is directly applied to the sewn surface, there is a possibility that it will penetrate inside. Since the water-repellent treatment is not considered permanent, there is a possibility that water may seep in through the sewn area. The configuration of this embodiment has the advantage that water will not seep in unless the welded portion 12, mattress cover material 14, or mattress surface sheet are damaged. (c) Even if a thermoplastic polyurethane resin is used for the mattress cover material 14, a mattress cover and a mattress having practical waterproof properties can be provided by using ultrasonic welding as the welding method.

[0045] [Other embodiments] Hereinafter, another embodiment of the present invention will be described. This embodiment can basically be regarded as a different invention from the first and second embodiments described above. Furthermore, this embodiment can also be regarded as an invention that shares some of the configuration of the present invention described in the first and second embodiments.

[0046] When a mattress with a waterproof zipper is used by a user suffering from a severe mental illness, the waterproof zipper may be destroyed. Therefore, if a mattress is manufactured with all sides welded together, the user may jump on the mattress, so we developed a mattress with measures to prevent this.

[0047] The mattress shown in Figure 6 has a mattress component 26 formed in the shape of a flat rectangular parallelepiped, and a mattress surface sheet 27 that covers the surface of mattress component 26. Mattress component 26 is made of an elastically deformable and compressible member, and has mattress upper and lower surface portions 26c and four mattress side portions 27a, 27b.

[0048] The four mattress side surfaces 27a, 27b are made up of left and right mattress side surfaces 26a and front and rear mattress side surfaces 26b. The mattress top sheet 27 has upper and lower top sheet surfaces 27c, left and right side surface surfaces 27a, and front and rear side surface surfaces 27b corresponding to each surface of the mattress component 26. An air vent opening 33 is provided in at least one of the four side surface surfaces 27a, 27b.

[0049] In the configuration shown in Figures 6 and 9, as shown in Figure 7, a pair of upper and lower sheet ends 27d, 27d are folded inward at the vertical center of the left and right side sheet portions 27a to form a horizontal joint 31, thereby forming a joint 30 of the left and right side sheet portions 27a.

[0050] 6 is joined by joining the front and rear sheet ends 27e of the left and right side sheet portions 27a to the inner surfaces of the front and rear side sheet portions 27b, as shown in Fig. 7, to form front and rear joint portions 32. By forming the front and rear joint portions 32, the left and right side sheet portions 27a and the front and rear side sheet portions 27b are firmly joined together. As the joining method, various joining methods such as welding and adhesion can be used.

[0051] 6 and 9, the air release openings 33 are formed by providing non-jointed portions 34 at predetermined locations of the horizontal joints 31 extending in the front-to-rear direction, as shown in Fig. 7. The non-jointed portions 34 have a length that allows communication between the inside and outside of the mattress topsheet 27.

[0052] 7 and 8 are diagrams showing the operation of the mattress in this embodiment. As shown in Figure 7, when there is no pressure on the air release opening 33 to push out air from inside the mattress 25, the air release opening 33 is in a flat, substantially closed state. However, when the user of the mattress 25 jumps on the mattress as described above, the pressure inside the mattress 25 increases, and as shown in Figure 8, air 35 escapes through the air release opening 33, preventing problems such as damage to the mattress top sheet 27.

[0053] The position where the air vent opening 33 is to be provided is not particularly limited, but it can be provided at a predetermined position either in the lateral joint 31 or the front and rear joints 32 of the side sheet portions. 6 shows a configuration in which air release openings 33 are provided on the left and right side positions of mattress-forming portion 26 where the weight of the user is most heavily applied when lying down. In this way, air release openings 33 are preferably provided near the positions where a large amount of air pressure is first applied when the user jumps up and down on mattress 25.

[0054] The mattress 25 shown in FIG. 9 has a mattress top sheet 27 with a joint 30 formed in the vertical center not only on the left and right side sheet portions 27a but also on the front and rear side sheet portions 27b. In addition, the configuration shown in FIG. 9 shows a configuration in which two air vent openings 33 are provided in the front-rear direction of the right side sheet portion 27a and two are provided in the left side sheet portion 27a, for a total of four (plural) air vent openings 33.

[0055] In the above configuration, an example is given of a configuration in which the air release opening 33 is provided at the joint 30, but the present invention does not exclude a configuration in which the air release opening 33 is provided in a part of the mattress surface sheet 27 other than the joint 30. However, with the above-described configuration, the air release opening 33 can be formed at the same time as the joint 30 is formed, and this has the advantage that the periphery of the air release opening 33 is reinforced by the joint 30. Furthermore, if a new air release opening 33 is provided at a position other than the joint 30, an extra step of providing the new air release opening 33 is required, and a reinforcing section must be provided to reinforce the periphery of the air release opening 33 so that the mattress top sheet 27 does not tear at the position of the air release opening 33.

[0056] An example of a conceptual description of this other embodiment will be described below as an appendix. A mattress according to a ninth aspect of the present invention comprises a mattress component made of an elastically deformable and compressible member and having four mattress side sections, and a mattress surface sheet having four side sheet sections covering the surface of the mattress component, The invention is characterized in that at least one of the four side sheet portions is provided with an air vent opening.

[0057] A tenth aspect of the present invention is the mattress according to the ninth aspect, characterized in that the side sheet portion has a joint where the mattress surface sheet is joined, and the air release opening is provided at the joint.

[0058] An eleventh aspect of the present invention is the mattress according to the ninth aspect, characterized in that the joint portion is formed by folding inward the ends of the pair of upper and lower sheets at a vertically intermediate portion of the side sheet portion, wherein the intermediate portion includes a central portion. A twelfth aspect of the present invention is a mattress according to the tenth or eleventh aspect, characterized in that the air release opening is configured by providing a non-jointed portion in a partial area of the joint.

[0059] A thirteenth aspect of the present invention is the mattress according to the ninth aspect, characterized in that the air release openings are provided at symmetrical positions on the left and right of the mattress constituent portion. A fourteenth aspect of the present invention is the mattress according to the ninth aspect, characterized in that the side sheet portions are provided with two to ten air release openings.

[0060] A fifteenth aspect of the present invention is the mattress according to the ninth aspect, wherein the mattress topsheet has a welded portion welded to a fastener tape portion of a waterproof fastener, The welded portion is located at a position where no internal pressure is applied to the mattress top sheet.

[0061] Although the present invention has been described above by way of example of an embodiment, the technical scope of the present invention is not limited to the configurations described in the above embodiment. The technical scope of the present invention should be determined based on the claims, and it goes without saying that various modifications, additions to the configuration, and improvements can be made within that scope. [Explanation of symbols]

[0062] 1: Mattress 2: Mattress cover 5:Waterproof zipper 6: Mattress component 7: Zipper tape section 12: Welded part 13: Middle class 14: Mattress cover material

Claims

1. A mattress cover using a waterproof zipper, The mattress cover has a welded portion where the mattress cover material constituting the mattress cover is welded to the fastener tape portion of the waterproof fastener.

2. 2. The mattress cover according to claim 1, wherein the mattress cover material is made of a thermoplastic polyurethane resin sheet, and the welded portions are formed by ultrasonic welding.

3. The mattress cover according to claim 2, wherein the welded portion is configured by interposing a thermoplastic polyurethane resin sheet as an intermediate layer between the thermoplastic polyurethane resin sheet that is the mattress cover material and the fastener tape portion.

4. The mattress cover according to claim 3 , wherein the intermediate layer extends toward the center beyond the welded portion to cover the fastener tape portion.

5. a mattress component made of an elastically deformable and compressible member; a mattress surface sheet that covers the surface of the mattress component, The mattress has a welded portion where the mattress top sheet is welded to the fastener tape portion of the waterproof fastener.

6. 6. The mattress according to claim 5, wherein the mattress top sheet is made of a thermoplastic polyurethane resin sheet, and the welded portions are formed by ultrasonic welding.

7. The mattress of claim 6, wherein the welded portion is configured by interposing a thermoplastic polyurethane resin sheet as an intermediate layer between the thermoplastic polyurethane resin sheet as the mattress surface sheet and the fastener tape portion.

8. The mattress according to claim 7 , wherein the intermediate layer extends toward the center beyond the welded portion to cover the fastener tape portion.

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