JP2005270512A - Individual packaging structure of absorbent article - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an individual packaging structure of an absorbent article, even if using a packaging material having a high melting point and being inferior in heat sealing performance, enabling a heat seal at a low melting point and stabilizing a quality. <P>SOLUTION: This individual packaging structure of the absorbent article joiningly seals at least both side edges 3a and 3a of the packaging material 3 by the heat seal with the absorbent article 2 packaged individually, the inside of the packaging material 3 is attached with polyolefin synthetic pulp 5 in a range including at least both side edges 3a and 3a to be heat sealed, and both edges 3a and 3a are mutually joined by heat seal. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an individual packaging structure of an absorbent article that enables heat sealing at a low melting point and can stabilize the quality regardless of the material type and layer structure of the packaging material.

  Conventionally, for example, sanitary napkins have been provided to the market in a state in which the manufactured napkins are tri-folded or quadruple-folded and individually packaged. When the user uses this napkin, the individual bag is opened, the napkin is taken out from the inside, and the non-use surface is adhered to the inner surface of shorts or the like.

Examples of the packaging material include polyolefin films such as polypropylene and polyethylene, polyester films such as polyethylene terephthalate, functional films such as antibacterial and deodorizing films, polyethylene nonwoven fabrics, polypropylene nonwoven fabrics, polyester nonwoven fabrics, and papers. Is folded into three or four in the vertical direction and wrapped with a packaging material, and at least the overlapping portions of both side edges are welded and sealed by heat sealing (see Patent Documents 1 and 2 below). In addition, although the longitudinal direction edge part of the said packaging material can also be fastened with a heat seal, many are sealed with the adhesive and the pouch tape so that it may open easily.
JP-A-8-324635 JP 2003-93437 A

  As a packaging material for individually packaging the absorbent article, when a non-melting polyethylene film or a non-woven fabric containing thick polyethylene is used in the above-mentioned packaging material group, the heat sealing property is good and sufficient sealing strength is obtained. However, when a film such as polypropylene or polyester, or a non-woven fabric, or a functional film such as an antibacterial / deodorant film is used as a packaging material, the heat-sealability is poor because the melting point is high, and the bonding strength , And sometimes opened the mouth when carrying. Further, when heat-sealing at a high temperature in order to increase the bonding strength, there is a problem that the heat seal part becomes hard and the feeling of touch and the texture are impaired.

  Further, when a low-weight nonwoven fabric is used, the strength of the sheet itself is low, and there is a possibility that the material is broken when the pouch tape is peeled off at the time of opening and the material is broken.

  Therefore, the main problem of the present invention is to use a material having a high melting point and poor heat sealability as a packaging material, such as films such as polypropylene and polyethylene terephthalate, and non-woven fabrics, paper, and functional films such as antibacterial and deodorant films. Even in this case, it is an object to provide an individual package structure of an absorbent article that enables heat sealing at a low melting point and stabilizes quality.

In order to solve the above-mentioned problems, as the present invention according to claim 1, in the state where the absorbent article is individually packaged, the individual absorbent articles sealed by joining at least both side edges of the packaging material by heat sealing. In the packaging structure,
A polyolefin synthetic pulp is attached to an inner surface side of the packaging material in a range including at least both side edges to be heat sealed, and the both side edges are heat sealed to each other. A packaging structure is provided.

  In the present invention according to the first aspect, polyolefin synthetic pulp is attached in advance to a range including at least both heat-sealed side edges of the inner surface of the packaging material, and the both side edges are heat-sealed. .

  Therefore, regardless of the material type or layer structure of the packaging material, any packaging material can be heat-sealed at a low melting point (135 ° C.) equivalent to polyethylene, and the quality can be stabilized.

  In addition, since the polyolefin synthetic pulp has a fibril shape as a fine structure and a powder or fiber form with the naked eye, heat sealing can be performed without increasing the weight of the packaging material. In addition, heat sealing joining is performed by fusion of polyolefin synthetic pulps attached to the inner surface, not the base material of the packaging material itself, so that the strength of the packaging material is not substantially reduced, and tearing or the like occurs when opened. There is no.

As the present invention according to claim 2, in the individual packaging structure of the absorbent article sealed by joining at least both side edges of the packaging material with a heat seal in a state where the absorbent article is individually packaged,
The packaging material contains a synthetic polyolefin pulp in an innermost layer, and the both-side edge portions are heat-sealed and joined to each other. The polyolefin synthetic pulp may be added to the inner surface of the packaging material, or the polyolefin synthetic pulp may be contained in the innermost surface layer of the packaging material. Even in this case, the polyolefin synthetic pulp internally added in the layer enables heat sealing at a low melting point (135 ° C.), and the quality is stabilized.

  As the present invention according to claim 3, the packaging material is folded in three in the longitudinal direction, and the end portion of the lower packaging material is folded back in the overlapping portion where the longitudinal ends of the packaging material are overlapped, The individual packaging structure of an absorbent article according to any one of claims 1 and 2, wherein the folded surface of the lower packaging material and the inner surface of the upper packaging material face each other and are heat-sealed.

  When the packaging material is folded in three according to a general packaging form, the inner surface of the upper packaging material (attached surface or inclusion of polyolefin synthetic pulp) is contained in the overlapping portion where the longitudinal ends of the packaging material are overlapped with each other. Layer) faces the outer surface of the packaging material having a relatively high melting point and heat sealability is deteriorated, so that the lower surface of the polyolefin synthetic pulp adhering surface or the containing layer faces each other. It is desirable that the end portion of the material is folded, and the folded surface and the inner surface of the upper packaging material face each other to be heat-sealed.

  As described above in detail, according to the present invention, polyolefin synthetic pulp is attached to the inner surface side of the packaging material in a range including at least both side edges to be heat sealed, or the innermost layer is made to contain polyolefin synthetic pulp. This is the case when materials such as polypropylene and polyethylene terephthalate and non-woven fabrics, paper, and functional films such as antibacterial and deodorizing films are used as packaging materials. However, heat sealing with a low melting point is possible, and quality can be stabilized.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a perspective view of an individual absorbent article 1 according to the present invention, FIG. 2 is a view taken along the line II-II of FIG. 1, and FIGS. It is an expanded view of the packaging material 3 which shows an example.

  The individual absorbent article 1 includes an absorbent article 2 such as a sanitary napkin or a panty liner, and a packaging material 3 for individually packaging the absorbent article 2.

  As a packaging form, various methods have been conventionally proposed. In the illustrated example, as will be described in detail later, an absorbent article 2 is placed on the upper surface of the packaging material 3, together with the absorbent article 2. The packaging material 3 is folded in three, both side edges 3a, 3a are sealed by heat sealing, the longitudinal direction end 3b of the packaging material is sealed with an adhesive, and fastened with a pouch tape 6. Is.

  In this packaging structure, regardless of the material type or layer structure of the packaging material 3, heat sealing at a low melting point is possible, and in order to stabilize the quality, at least the heat is provided on the inner surface side of the packaging material 3 in advance. Polyolefin synthetic pulp 5 is attached to a range including both side edges 3a and 3a to be sealed, and heat-sealed joining is performed by fusion of the attached polyolefin synthetic pulps 5 to each other.

  The polyolefin synthetic pulp 5 may be attached to the entire inner surface (shaded area) of the packaging material 3 as shown in FIG. 3 (A), or as shown in FIG. 3 (B). It may be attached in a band shape (a shaded area defined by a chain line L) limited to both side ends so as to include both side edges 3a and 3a to be sealed.

  As the polyolefin synthetic pulp 5, those produced by various methods developed by many synthetic resin manufacturers can be used. As the polyolefin resin, polyethylene, polypropylene, or the like is used. In order to perform heat sealing at a low melting point, it is desirable to use a polyethylene synthetic pulp containing polyethylene as a main component. Polyethylene synthetic pulp is also desirable in terms of market availability, homogeneity, and availability.

  The method for producing polyolefin synthetic pulp is described in detail in, for example, Encyclopedia of Chemical Technology 3rd ed, Vol. 19, P420 to P425. A method of performing a beating process after performing the process is illustrated.

  A typical example that is currently commercially available and can be easily obtained is a polyolefin synthetic pulp “SWP” (registered trademark) [manufactured by Mitsui Chemicals, Inc.]. Since “SWP” is described in detail in Japanese Patent Application Laid-Open Nos. 9-157946 and 2001-81627, description thereof is omitted.

  In order to attach these polyolefin synthetic pulps to the packaging material, any means may be used as long as it is a means for fixing the powder or fibrous material to the surface of the packaging material 3. For example, after spraying the polyolefin synthetic pulp, heat treatment may be performed to fix it, or an adhesive or an adhesive may be applied before or after the polyolefin synthetic pulp is sprayed. As the polyolefin synthetic pulp, those having a fiber length of 0.1 mm to 10 mm can be suitably used. If it is less than 0.1 mm, the fiber length is too short to be attached, and if it exceeds 10 mm, the fiber length is too long and sufficient heat seal strength cannot be obtained when heat treatment is performed. The fiber length can be measured using an FS-200 type automatic fiber length measuring machine manufactured by Kayani, Finland. The average fiber length is expressed as a weight average.

  Even if the polyolefin synthetic pulp is attached to the inner surface of the packaging material 3, the increase in the basis weight of the packaging material 3 is slight, and any packaging material can be used regardless of the material type or the laminated structure of the packaging material. However, heat sealing becomes possible at a low melting point (135 ° C.) equivalent to polyethylene, and the quality becomes stable.

  As a result, a low-priced material having a high melting point and a poor heat sealability, such as paper or polypropylene nonwoven fabric, can be used as the material for the packaging material 3, and a low-weight nonwoven fabric with high fiber strength such as polyester. Becomes available. Furthermore, effects such as being able to use a functional film having deodorant and antibacterial properties as a packaging material are brought about.

  The packaging material 3 may be a single-layer sheet as shown in FIG. 4 (A), and the polyolefin synthetic pulp 5 may be attached to the inner surface thereof, as shown in FIG. 4 (B). In addition, a multilayer sheet, in the figure, a two-layer laminated sheet, and the polyolefin synthetic pulp 5 may be attached to the inner surface side thereof. Examples of the laminated sheet include a laminated sheet of a high melting point film such as a polypropylene film and a polyester film and a high melting point nonwoven fabric such as polypropylene and polyester, and a laminated sheet of a functional film and a high melting point nonwoven fabric.

  The polyolefin synthetic pulp 5 is attached to the inner surface of the packaging material 3, and as shown in FIG. 5, in the innermost layer of the packaging material 3, specifically, a single layer shown in FIG. In the case of a sheet, polyolefin synthetic pulp may be contained (internally added) in the layer of the single-layer sheet, and in the case of the laminated sheet shown in FIG. Good. Even in this case, heat sealing can be performed at a low melting point (135 ° C.) equivalent to polyethylene without increasing the basis weight of the packaging material 3 regardless of the material type or laminated structure of the packaging material. And the quality becomes stable.

  In packaging the absorbent article with the packaging material 3 described above, for example, as shown in FIG. 6, the absorbent article 2 is placed on the upper surface of the packaging material 3 with the absorbent article 2 at the position of the broken line 9. After the packaging material 3 is folded, it is folded at the position of the folding line 10 closer to the unsealing side edge 3b. In this state, the packaging material 3 on the upper side is overlapped at the overlapping portion where the longitudinal ends of the packaging material 3 are overlapped with each other. Since the inner surface of the material (attached surface or containing layer of polyolefin synthetic pulp) faces the outer surface of the packaging material 3 having a relatively high melting point, the heat sealability is deteriorated, and therefore, it is shown in FIG. 6 (B). As described above, the end portion of the lower packaging material 3 is folded back so that the attachment surface or the containing layers of the polyolefin synthetic pulp 5 face each other, and the folded surface 3c and the inner surface of the upper packaging material 3 are made to face each other. Heat seal contact It is desirable to be.

[Other examples]
(1) Although an adhesive layer is provided on the back surface of the absorbent article, the release paper covering the adhesive layer may be provided or omitted. When the release paper is provided, the release paper is fixed to the inner surface side of the packaging material 3 so as not to be peeled. When the release paper is omitted, the inner surface of the packaging material 3 is, for example, a silicone resin, a fluorine resin, or tetrafluoride. A release treatment is performed by a method such as coating or spray application of a release treatment solution such as ethylene resin, and the adhesive layer of the absorbent article 2 is directly adhered to the packaging material 3.

1 is a perspective view of an individual absorbent article 1 according to the present invention. It is the II-II arrow directional view of FIG. (A), (B) is an expanded view of the packaging material 3 which shows the example of attachment of the polyolefin synthetic pulp 5, respectively. (A), (B) is a figure which shows the example of a layer structure of the packaging material 3 in the case of attaching the polyolefin synthetic pulp 5, respectively. (A), (B) is a figure which shows the example of a layer structure in the case of making the polyolefin synthetic pulp 5 contain in a layer, respectively. It is a procedure figure which shows the individual packaging point by this packaging material 3. FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Individual absorbent article, 2 ... Absorbent article, 3 ... Packaging material, 3a ... Both-side edge part, 3b ... Opening side edge, 3c ... Folding surface, 5 ... Polyolefin synthetic pulp, 6 ... Pouch tape, 9. 10 ... fold line

Claims (3)

In a state where the absorbent article is individually packaged, in an individual package structure of the absorbent article sealed by joining at least both side edges of the packaging material by heat sealing,
A polyolefin synthetic pulp is attached to an inner surface side of the packaging material in a range including at least both side edges to be heat sealed, and the both side edges are heat sealed to each other. Individual packaging structure. In a state where the absorbent article is individually packaged, in an individual package structure of the absorbent article sealed by joining at least both side edges of the packaging material by heat sealing,
The packaging material includes a synthetic polyolefin pulp in an innermost layer, and the both side edges are heat-sealed and bonded to each other. The packaging material is folded in three in the longitudinal direction, and the end portion of the lower packaging material is folded back at the overlap portion where the longitudinal ends of the packaging material are overlapped, and the lower packaging material is folded back. The individual packaging structure of an absorbent article according to any one of claims 1 and 2, wherein the surface and the inner surface of the upper packaging material face each other and are heat-sealed.

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