JP4152850B2 - Individual packaging structure for absorbent articles - Google Patents

Description

  The present invention relates to an individual packaging structure for absorbent articles such as sanitary napkins.

  Conventionally, a plurality of absorbent articles are sold in a bundled form, and are used one by one when used. In particular, sanitary napkins are individually packaged to pack absorbent articles one by one from the viewpoint of hygiene (see, for example, Patent Document 1).

  A conventional general individual packaging form is shown in FIGS. In the state where the sanitary napkin 2 folded in three is arranged on the packaging sheet 1 made of a single thin polyethylene film or the like, the longitudinal ends 1A and 1C of the packaging sheet 1 are folded back toward the central portion 1B. Then, one end 1A is overlaid on the other end 1C, and the adhesive tape 3 is applied and sealed from the surface of the one end 1A to the surface of the other end 1C. The “*” mark in the figure indicates the adhesive of the adhesive tape. In addition, overlapping portions 1D and 1D at both end edges in the width direction are sealed by heating embossing or the like. Thus, the individual package P in which the napkin 2 is packaged by the packaging sheet 1 is configured.

  In such individual packaging, when the adhesive tape 3 is peeled from the other end 1C side of the packaging sheet 1 to the one end 1A side, the adhesive tape 3 is completely removed from the other end 1C of the packaging sheet 1. After the peeling, the one end 1A of the packaging sheet 1 is lifted via the adhesive tape 3, and the seals 1D and 1D on both side edges are sequentially peeled off and then opened.

  The packaging sheet 1 is also used to wrap a used napkin and throw it away or carry it until it is thrown away (hereinafter also referred to as post-treatment). In this case, the napkin 2 is placed on the packaging sheet 1 in the state where it is disposed. Is used with the end 1C on the side opposite to the adhesive tape 3 side being wound as a starting end, and then the end is stopped with the adhesive tape 3.

However, in such a conventional individual packaging structure, when the adhesive property of the adhesive tape is set so as to be suitable for the post-treatment of the used napkin, the force required for opening becomes strong, and the packaging sheet is pulled with the force of pulling the adhesive tape forcefully. May break and the adhesive tape may come off. For this reason, if the adhesive strength is set weaker with emphasis on ease of opening, the adhesive tape will be easily peeled off this time, not only the sealing force of the packaging sheet will be reduced, but also the re-adhesive strength in post-processing. It will be insufficient. That is, the ease of opening and the securing of the re-adhesive strength in post-processing are contradictory elements, and it has been very difficult to achieve both.
Noto 2589604 gazette

  Therefore, the main problem of the present invention is to achieve both ease of opening and ensuring re-adhesive strength in post-processing.

The present invention that has solved the above problems is as follows.
<Invention of Claim 1>
In a state where the absorbent article is arranged on the packaging sheet, both end portions in the longitudinal direction of the packaging sheet are folded back to the center side, one end portion is superimposed on the other end portion, and the width direction center portion is with adhesive tape from the surface of the one end portion to the surface of the other end is attached, in a structure in which both edges in the width direction is sealed,
The packaging sheet is a polyethylene sheet having a thickness of 10 to 60 μm, a polypropylene sheet, or a polyurethane sheet,
The peel strength of the adhesive tape with respect to the packaging sheet is 0.5 to 5.0 N / 25 mm,
An absorptive article characterized in that at least a part to which the adhesive tape is applied at one end of the packaging sheet is formed as a double sheet in which the sheet is folded back and integrated with the back surface. Individual packaging structure.

(Function and effect)
As a result of diligent research, the present inventors have found that it is extremely difficult to achieve both easy opening and ensuring re-adhesion in post-processing only by adjusting the adhesive strength of the adhesive tape. The present invention was made based on the recognition that this is necessary.

  That is, in the present invention, at least the adhesive tape affixed portion at one end of the packaging sheet is formed of an integrated double sheet, so that the portion has a high strength unlike the other portions, and the adhesive strength of the adhesive tape Therefore, even if the re-adhesion force in the post-processing is sufficiently secured, it is possible to prevent the adhesive tape from coming off due to the breakage of the packaging sheet.

  At first, it was considered to increase the material thickness of the packaging sheet. In this case, however, the flexibility of the packaging sheet was lost, and when a resin film was used, it became a plastic-like texture (plastic-like). In order to avoid this problem, in the present invention, only the predetermined portion described above is used in order to avoid this problem. A structure with a heavy sheet is adopted.

The “packaging sheet” in the present invention means the outermost sheet that wraps the absorbent article. Further, the "integrated" in the present invention, is fixed so as not to come off upon opening of the package sheet, it means that are integrated so as to be able to share the tensile force by opening of two sheets.

Further, one end portion of the package sheet, when the sheet is formed as a by Ri double sheet to be integrated with the folded and the rear surface on the back side, is easy to manufacture, higher integrity Become.

<Invention of Claim 2 >
Wherein on at least sticking portion of the adhesive tape at the end of the packaging sheet, the sheet is formed as the double sheets by is releasably adhered to folded and the rear surface on the back, and the back surface The individual packaging structure for absorbent articles according to claim 1, wherein post-treatment fastening means is provided at least at the tip of the folded portion toward the side.

(Function and effect)
In such a structure, since one end of the packaging sheet is extended by peeling off the folded portion to the back side, a post-treatment fastening means is provided on the extended portion, and thus used. Even if the article is expanded due to absorption of body fluid or loosely wrapped, it can be easily and reliably wrapped and resealed. In addition, as in the conventional case, when the adhesive tape for packaging sealing is reused, a decrease in adhesive force is inevitable. However, in the invention described in this section, a structure for separately providing fastening means dedicated to post-processing is provided. Therefore, even when the adhesive is used, it is possible to suppress a decrease in the adhesive force, and it is possible to adjust the adhesive force to be suitable for post-processing or to employ other fastening means.

  As described above, according to the present invention, both ease of opening and securing of re-adhesive force in post-processing can be achieved.

Hereinafter, embodiments of the present invention will be described in detail.
FIG.1 and FIG.2 has shown the example of the individually packaged absorbent article which concerns on this invention, and is comprised from the sanitary napkin 2 as an absorbent article, and the packaging sheet 1 which wraps this. The material wrapping sheet 1, a polyethylene sheet, a polypropylene sheet, a polyurethane sheet Ru is used. Moreover, when the thickness of the packaging sheet 1 is in the range of 10 to 60 μm, particularly 10 to 30 μm, it is possible to ensure a reduction in peeling sound and a cloth-like texture (cross-like).

  As can be seen from the unfolded state of FIG. 3, the packaging sheet 1 of this embodiment has a vertically long rectangle, the width of which is wider than the width of the napkin 2, and the length is slightly longer than the napkin 2. It is supposed to be short. At one end in the vertical direction, the end edge of the napkin 2 is arranged slightly shifted from the end edge of the packaging sheet 1 toward the center side, and at the other end, the end edge of the napkin 2 is disposed at the packaging sheet 1. It arrange | positions so that it may protrude a little from the edge. The back surface of the napkin 2 is fixed to a release sheet (not shown) that is adhesively fixed on the packaging sheet 1, for example, via a pressure sensitive adhesive (not shown).

  In the packaged state, in the state where the napkin 2 is arranged on the packaging sheet 1, the other end 1C (hereinafter referred to as an inner end) is on the inside, and one end 1A (hereinafter referred to as an outer end) on the outer side thereof. Are overlapped and folded together in three. Furthermore, in this tri-fold state, the adhesive tape 3 is stuck from the surface of the outer end 1A of the packaging sheet 1 to the surface of the inner end 1C. The pressure-sensitive adhesive tape 3 is formed by applying a pressure-sensitive adhesive (indicated by “*” in FIG. 2) to the back surface of the tape base material, and the tip 3a is folded back to make it easy to pick. It is fixed on the back with an adhesive. Moreover, when using the narrow adhesive tape 3 like illustration, since the whole width direction cannot be sealed, it is preferable to give a weak heat seal linearly along the width direction. On the other hand, both side edges (both edges in the width direction) 1D and 1D are sealed by a hot emboss seal or the like.

  As a pressure-sensitive adhesive for joining the pressure-sensitive adhesive tape 3 and the packaging sheet 1, a pressure-sensitive adhesive such as a styrenic block polymer, a tackifier, a softener, and an antioxidant are blended, and a styrene phase and a rubber phase 2 An adhesive or the like having a phase block structure can be used. Examples of the styrenic block polymer include SEBS, SIS, SBS, and SPS. The tackifier is a copolymer of C5 petroleum resin, C9 petroleum resin, C5 / C9 petroleum resin, α pinene, β pinene or dipentene having a softening point of 80 ° C. or higher and a molecular weight of 400 to 2000. Some polyterpene resins, rosin resins, hydrogenated products thereof, and the like can be given. Examples of the softener include process oil having a softening point of 10 ° C. or less and an average molecular weight of 200 to 700, various plasticizers, polybutene, and a liquid resin.

Moreover, the peeling strength of the adhesive tape 3 shall be 0.5-5.0N / 25mm. The peel strength can be adjusted by providing unevenness on the surface of the packaging sheet 1 or performing a release treatment. In addition, the peeling strength here uses 300 mm / min for the adhesive tape and packaging sheet which were adhere | attached by the width | variety of 25 mm using a tensile testing machine (for example, Tensilon by Orientec Co., Ltd.) at 180 degree opposite directions. It means the peak value when pulling at a speed to peel off.

  And according to this invention, the outer edge part 1A of the packaging sheet 1 is formed as a double sheet | seat by the sheet | seat base material being folded back and integrated with respect to the back surface. The sheet substrates may be integrated with each other as long as they are integrated so that the two sheets can share the tensile force due to opening, and appropriate means such as adhesion (including adhesion) and welding (including heat sealing) are used. Can be used. Thus, the sticking part of the adhesive tape 3 at the outer end 1A has a double sheet structure, and the adhesive strength of the adhesive tape 3 is set to a strength suitable for post-processing, and as shown by the arrow in FIG. Even if the tape 3 is pulled strongly, it is difficult to reach a situation where the packaging sheet 1 is broken and the adhesive tape 3 is detached.

  On the other hand, the illustrated example shows a particularly preferable form, and not only the outer end portion 1A of the packaging sheet 1 has a double sheet structure, but also the folded portion 1E to form a double sheet with respect to the opposing surface. Adhering in a peelable manner, a post-processing fastening means 4 is provided at least at the tip of the folded portion 1E.

  The means for releasably bonding the folded portion 1E is shown as a range N indicated by hatching in FIG. 1 and by a “+” mark in FIG. As this adhesion means, for example, the same adhesive as the above-mentioned adhesive tape 3 or a hot melt adhesive can be used. The peel strength can be in the same range as the above-mentioned adhesive tape. In order to adjust the peel strength, it is also a preferable form to perform a release treatment on the surface 1X of the packaging sheet 1 that faces the application surface such as the adhesive. As the release agent, a silicone resin-based, fluorine-resin-based, or octadecyl isocyanate-based one can be suitably used. These adhesives and the like can be applied only to the base end side (folding line side) corresponding to the pressure-sensitive adhesive tape, or can be applied to the entire folded portion in a continuous or intermittent pattern. The peel strength can also be adjusted by this coating pattern.

  As the post-processing fastening means 4, an adhesive tape 4 or the like can be separately provided as shown, or can be configured using the above-mentioned adhesive. Specifically, as shown in FIGS. 1 and 2 to 4, N or the like is applied to the entire width direction only on the base end side portion corresponding to the adhesive tape 3 in the folded portion 1 E, and the opposing sheet base A mode in which the material is detachably adhered and the post-treatment pressure-sensitive adhesive tape 4 is pasted from the tip portion of the folded portion 1E to the non-double portion is preferable. The “#” mark in FIG. 2 indicates the adhesive of the post-processing adhesive tape 4, and also in this adhesive tape 4, the tip portion 4 a is folded and fixed to the adhesive for easy gripping. .

  Further, as shown in FIG. 5 and FIG. 6, adhesives (ranges M1, M2 and “+” in the drawings are applied to the proximal end portion 1P and the distal end portion 1F corresponding to the adhesive tape 3 in the folded portion 1A over the entire width direction. "") Is applied, the opposing sheet base material is peelably adhered, and the pressure-sensitive adhesive M1 (also pressure-sensitive adhesive M2 in some cases) can be used as a post-treatment fastening means. Although it is possible to apply the adhesive to the entire folded portion 1E and configure the whole as a post-treatment fastening means, it is not preferable in that the amount of the adhesive used is increased.

  In these examples, as shown in FIGS. 4 and 6, the packaging sheet 1 is extended by peeling off the folded portion 1E at the outer end 1A, and the post-process fastening is attached to the extended portion 1X. Since the means 4 and M1 are provided, even if the used article is expanded due to absorption of body fluid or is wrapped loosely, it can be easily and reliably wrapped and resealed. In addition, the state which wrapped the used napkin in the form of FIG. 4 is shown by FIG.

  Further, when the adhesive tape 3 for packaging and sealing is reused as in the prior art, a decrease in adhesive force is inevitable. However, in the invention described in this section, the fastening means 4 dedicated to post-processing, M1 Since it is provided separately, it is possible to suppress a decrease in adhesive force even when it is due to adhesion, and it is possible to adjust the adhesive force to be suitable for post-processing, or to adopt other fastening means is there.

(Other)
In the present invention, as shown in FIG. 10, a reinforcing sheet 10 that is separate from the packaging sheet 1 is fixed to the back surface of the range 1G including the adhesive tape 3 sticking portion at the outer end 1 </ b> A of the packaging sheet 1. Is also included.

  In addition to sanitary napkins, the present invention can be applied to known absorbent articles such as incontinence pads and disposable paper diapers, and is particularly suitable for absorbent articles where hygiene is an important issue in product images.

It is a top view of the individual packing object to which the present invention is applied. It is the figure which showed roughly the longitudinal cross-section of the individual package which applied this invention. It is the top view which showed the expansion | deployment state of the individual package which applied this invention. It is the top view which expand | deployed the extension part of the packaging sheet. It is the figure which showed the longitudinal cross-section in another example schematically. It is the top view which expand | deployed the extension part of the packaging sheet in another example. It is the top view which showed the post-processing form. It is a perspective view of the individual package of a general structure. It is the figure which showed schematically the longitudinal cross-section of the general structure. It is the figure which showed schematically the longitudinal cross-section in the other example of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Packaging sheet, 2 ... Sanitary napkin, 3 ... Adhesive tape, 4 ... Fixing means for post-processing.

Claims (2)

In a state where the absorbent article is arranged on the packaging sheet, both end portions in the longitudinal direction of the packaging sheet are folded back to the center side, one end portion is superimposed on the other end portion, and the width direction center portion is with adhesive tape from the surface of the one end portion to the surface of the other end is attached, in a structure in which both edges in the width direction is sealed,
The packaging sheet is a polyethylene sheet having a thickness of 10 to 60 μm, a polypropylene sheet, or a polyurethane sheet,
The peel strength of the adhesive tape with respect to the packaging sheet is 0.5 to 5.0 N / 25 mm,
An absorptive article characterized in that at least a part to which the adhesive tape is applied at one end of the packaging sheet is formed as a double sheet in which the sheet is folded back and integrated with the back surface. Individual packaging structure. Wherein on at least sticking portion of the adhesive tape at the end of the packaging sheet, the sheet is formed as the double sheets by is releasably adhered to folded and the rear surface on the back, and the back surface The individual packaging structure for absorbent articles according to claim 1, wherein post-treatment fastening means is provided at least at the tip of the folded portion toward the side.

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