JP4327184B2 - Absorbent article packaged individually and method for manufacturing the same - Google Patents

Description

  The present invention relates to an individually packaged absorbent article and a method for producing the same.

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. (For example, refer to Patent Document 1).
The form of the conventional individually packaged absorbent article is shown in FIGS. The packaging sheet 2 has a cylindrical shape in which both ends 2a and 2b in the vertical direction orthogonal to the packaging line flow direction are overlapped, and the edge e1 of the surface side portion 2a of the overlapped portion is the opening start end. At the same time, the overlapping portions 2c, 2c at both ends in the horizontal direction along the flow direction of the packaging line are pressure-sealed, and the absorbent article 1 is contained in the center. The pressure seal portions 2c and 2c are formed so as to be substantially continuous from one end in the vertical direction to the other end, and the edge e2 on the lateral center side of the pressure seal portions 2c and 2c has a linear shape along the vertical direction. ing. The lateral edge of the packaging sheet (the laterally outer edge of the pressure seal portions 2c, 2c) is also linear along the vertical direction.
On the other hand, for such individual packaging, conventionally, for example, a method as shown in FIG. 5 has been generally employed (see, for example, Patent Document 2). That is, first, the belt-shaped packaging sheet 2 is sent out to the packaging line, and after the absorbent article 1 is arranged on the belt-shaped packaging sheet 2L, the widthwise both ends 2a, 2b of the belt-shaped packaging sheet 2 are folded back to the center side. Wrapping the property article 1. Thereafter, the band-shaped packaging sheet 2 containing the absorbent article 1 is sandwiched between a pair of rolls 10 and 10 (see FIG. 6 described later) having ridges that are substantially continuous from one end in the width direction to the other end. The seal parts S and S before and after the line flow direction of the part including the absorbent article 1 are pressed between the convex line of one roll 10 and the convex line of the other roll 10 to end one end in the width direction. A substantially continuous pressure seal is applied from one end to the other. Then, the absorbent article P packaged individually as described above is obtained by cutting the intermediate position in the line flow direction in the pressure seal portions S, S by the cutting device 11.
Noto 2589604 gazette Japanese Patent Publication No.7-121725

However, as in the conventional packaging form, when the edge of the central portion in the horizontal direction of the pressure seal portion is linear along the vertical direction, the edge of the central side is vertical in the vertical direction due to the pressure seal during packaging. Sometimes it was cut all over and the seals made no sense.
Therefore, a main problem of the present invention is to prevent such cutting.

The present invention that has solved the above problems is as follows.
<Invention of Claim 1>
It consists of an absorbent article and a packaging sheet that wraps it,
The packaging sheet has a cylindrical shape in which both ends in the vertical direction perpendicular to the packaging line flow direction are overlapped, and the edge of the surface side portion of the overlapped portion is an opening start end, and the packaging line The overlapping portions at both ends in the transverse direction along the flow direction are pressure sealed, and the pressure sealing portion is formed so as to be substantially continuous from one end to the other end in the longitudinal direction. entire edge of the transverse direction central side is inclined against the vertical linear, or curvilinear, that have no corrugated or zigzag shape,
An individually packaged absorbent article characterized in that.

(Function and effect)
The inventors of the present invention conducted intensive research on the cutting of the pressure seal portion described above, and obtained the following knowledge. That is, when a pressure seal is applied between the ridge 10p of the first roll 10 and the ridge 10p of the second roll 10 rotating in the line flow direction as shown in FIG.
(1) The front edge x1 of the ridge 10p in the rotational direction comes into contact with the packaging sheet 2 first,
(2) Next, the entire surface Z1 of the ridge 10p contacts,
(3) Thereafter, only the edge x2 on the rear side in the rotation direction of the ridge 10p is in contact with the packaging sheet 2,
(4) The ridges 10p are separated from the packaging sheet 2.
In such a state transition, in the states (1) and (3), the pressure due to the front and rear edges x1, x2 of the ridges 10p, 10p is substantially the same in a vertical direction perpendicular to the line flow direction with respect to a small area. Therefore, the packaging sheet 2 is easily cut.
The present invention has been made based on such knowledge, and the point is that the pressure seal portion is substantially continuous from one end in the longitudinal direction to the other end, and the edge of the pressure seal portion on the lateral center side. Is a configuration that does not form a straight line along the vertical direction.
When applying such a pressure seal, for example, as shown in FIG. 7, the front and rear edges x1 and x2 of the ridge 10p simultaneously pressurize only a part of the packaging sheet 2 in the width direction. In other words, in the states (1) and (3), the front and rear edges x1, x2 of the ridge 10p and the contact portion y of the packaging sheet 2 are not substantially continuous in the vertical direction. Therefore, even if cutting by the front and rear edges x1 and x2 of the ridge 10p occurs, it is only part of the packaging sheet 2 in the vertical direction and does not lead to cutting of the entire vertical direction. At first glance, the front and rear edges x1 and x2 of the ridge 10p eventually come into contact with the entire longitudinal direction of the packaging sheet 2 due to the rotation of the roll 10, so that the cutting proceeds in sequence accordingly and the longitudinal direction of the packaging sheet 2 is increased. Although it appears as if the entire direction is cut, this is not the case as is apparent from FIG. For example, considering the state in which the front edge x1 of the ridge 10p of the roll 10 starts to contact the packaging sheet 2, the surface contact is first at the position where the packaging sheet 2 is first contacted in the roll width direction. Since the transition to the state (there is part or all in the roll width direction, except that it is the same as the state of (2) described above), the protrusion 10p that contacts the packaging sheet 2 with a delay In the front edge x1, only the edge x1 is not in contact with the packaging sheet 2, but the range z2 including the portion where contact is started first and the surface contact state is shifted comes into contact with the packaging sheet 2. This is the opposite principle when the rear edge x2 of the ridge 10p moves away from the packaging sheet 2. Therefore, even if cutting by the front and rear edges x1 and x2 of the ridge 10p occurs, it is only a part of the packaging sheet 2 in the vertical direction, and the entire edge of the pressure seal portion 2c on the lateral center side is cut and sealed. It is possible to prevent the occurrence of defects.

Pressurizing lateral center side edge of the seal portion does not form a straight line along the longitudinal direction "of the configuration, in particular, wavy or zigzag form, functional beauty and luxury, look like cute (It is a very important function in sanitary napkins and the like) has an advantage that it can be made good. In addition, it cannot be overemphasized that the curve form in this invention does not include a straight line (henceforth, the same).

<Invention of Claim 2 >
Entire edge of the lateral direction of the package sheet is the are parallel formed to correspond to the entire edge of the transverse direction central side and the lateral pressure sealed portions and packaged individually as claimed in claim 1, wherein Absorbent article.

(Function and effect)
By adopting such a configuration, the pressure seal portion has a uniform geometric shape, and the appearance such as functional beauty, luxury, and cuteness is remarkably improved, and the pressure seal portion is placed on the side of the packaging sheet. Since it will extend along the edge of a direction with equal width, the peeling resistance of the pressure seal part at the time of opening will be stabilized, and smooth opening will be attained.

<Invention of Claim 3 >
Send the belt-shaped packaging sheet to the packaging line,
Place the absorbent article on this belt-shaped packaging sheet,
Then, wrap the absorbent article placed by folding the widthwise one side and the other side end of the belt-shaped packaging sheet,
The strip-shaped wrapping sheet containing the absorbent article is passed between a pair of rolls having ridges that are substantially continuous from one end to the other end in the width direction, and before and after the line flow direction of the part containing the absorbent article. Applying a pressure seal that is substantially continuous from one end to the other end in the width direction by pressurizing the seal part between the ridges of one roll and the ridges of the other roll,
Thereafter, the intermediate position in the line flow direction in the pressure seal portion is cut to obtain an individually packaged absorbent article;
At the time of the pressure seal, each edge before and after the rotation direction of the ridge is linear, curved, wavy or zigzag inclined from the one end to the other end in the width direction of the packaging sheet. A pressure seal that is substantially continuous from one end to the other end in the width direction by the protrusions while simultaneously pressing only a part from one end to the other end in the width direction of the packaging sheet by each edge. To do the
A method for producing individually packaged absorbent articles.

(Function and effect)
Thus, during pressure sealing, each edge before and after the rotation direction of the ridges pressurizes only a part from one end to the other end in the width direction of the packaging sheet while simultaneously pressing from one end to the other end in the width direction. When a substantially continuous pressure seal is performed, as described in the section of the effect of the invention of claim 1, even if cutting by the front and rear edges of the ridge occurs, the longitudinal direction of the packaging sheet It is only a part of, and does not lead to cutting in the entire vertical direction. Therefore, it is possible to prevent a situation in which the entire edge on the lateral center side of the pressure seal portion is cut and not sealed.

  As described above, according to the present invention, there are various advantages such as prevention of a situation in which the product is cut by a pressure seal during packaging.

Hereinafter, embodiments of the present invention will be described in detail.
(Embodiment related to packaging structure of absorbent article)
FIG. 8 shows an example P of the individually paved absorbent article according to the present invention, a sanitary napkin 1N as an absorbent article, and a packaging sheet made of a polyethylene sheet, a polypropylene sheet, a polyurethane sheet, etc. 2 and is basically the same as the conventional one shown in FIGS. 1 to 4 except for the form of the pressure seal.

  That is, the packaging sheet 2 has a cylindrical shape in which both ends 2a and 2b in the vertical direction orthogonal to the packaging line flow direction are overlapped, and the edge e1 of the surface side portion 2a of the overlapped portion is the opening start end. At the same time, the overlapping portions 2c, 2c of the lateral ends along the flow direction of the packaging line are pressure-sealed by an emboss seal or the like, and 1N sanitary napkin is contained in the center. Recently, in order to make the packaging compact, it has become common to individually wrap the sanitary napkin 1N in a three-folded state as shown in the figure. It may be good, and it may be folded in half or not folded.

  Moreover, in order to seal the opening start end e1 so that opening is possible, one end of the fastening tape 3 is fixed to the opening direction side (surface side part 2a) of the opening start end e1 substantially inseparably, and the other end Is peelably bonded to the opposite side of the opening start end. In a more preferred form, a gap is created between the front surface side portion 2a and the back surface side portion 2b on both sides of the fastening tape 3 only by fastening both longitudinal ends with the fastening tape 3 alone. The back surface and the back surface side part 2b of the surface side part 2a can be adhere | attached so that peeling is possible intermittently or continuously to a vertical direction. In this case, the user can perform opening by pinching the fastening tape 3 and pulling it in the opening direction OP.

  On the other hand, according to the present invention, the pressure seal portions 2c and 2c are formed so as to be substantially continuous from one end in the vertical direction to the other end, and the edge e2 on the lateral center side of the pressure seal portions 2c and 2c. Basically, e2 does not form a straight line along the vertical direction. For this reason, as shown in FIGS. 8 and 9, the edge e2 of the pressure seal portions 2c, 2c on the center side in the horizontal direction can be formed in a wave shape in which both the top and bottom protrude in an arc shape in the horizontal direction. As a similar shape, as shown in FIG. 10, it is also possible to adopt a wave shape in which one side of the top and the bottom is bent at an acute angle. As a similar shape, a zigzag shape in which both the top and bottom are bent acutely as shown in FIG. 11 may be used. Further, although not shown, it may be a curved shape such as an arc. In a simpler form, as shown in FIG. 12 and FIG.

  As shown in FIGS. 10 and 13, the center side edges e2 and e2 of the pressure seal portion 2c may be symmetric with respect to the center in the lateral direction, or may be asymmetrical, for example, as shown in FIGS. It can also be parallel to the lateral direction as shown.

  In a more preferred form, as shown in FIGS. 9 to 12, the lateral edges e3, e3 of the packaging sheet 2 are laterally aligned with the lateral edges e2, e2 of the pressure seal portions 2c, 2c. Are formed parallel to each other. In this case, the pressure seal portions 2c and 2c have a unified geometric shape, and the appearance such as functional beauty, luxury, and cuteness is remarkably improved, and the pressure seal portions 2c and 2c are provided on the packaging sheet. 2 will extend at equal widths along the lateral edges e3 and e3 in the horizontal direction, so that even if the pressure seal form is as shown in FIGS. , 2c does not become so unstable and smooth opening becomes possible. When such a configuration is adopted, when the center side edges e2 and e2 of the pressure seal portions 2c and 2c are formed in parallel to each other as shown in FIGS. 9 and 11, for example, FIG. As shown in FIG. 2, after performing double-width pressure sealing, cutting may be performed along the horizontal center line CL. On the other hand, when the center side edges e2 and e2 of the pressure seal portion are formed symmetrically with respect to the center in the horizontal direction as shown in FIGS. 10 and 13, for example, they are not required in the center in the horizontal direction of the pressure seal portion. Since the portion comes out, it is necessary to perform a pressure seal that secures a surplus of that amount (not shown).

  However, of course, in the present invention, the lateral edges e3, e3 of the packaging sheet 2 are formed in parallel so as to correspond to the lateral edges e2, e2 of the pressure seal portions 2c, 2c in the lateral direction. For example, as shown in FIG. 8, it can also be formed in a straight line along the vertical direction from the viewpoint of ease of cutting.

(Embodiment of manufacturing method)
On the other hand, the special shape of the edges e2 and e2 on the laterally central side in the pressure seal portions 2c and 2c described above is particularly effective when packaging in the production line. In the present invention, the special seal portion 2c is used. , 2c is also proposed. That is, in the manufacturing method according to the present invention, the flow of the packaging process itself is basically the same as that shown in FIG. 5, for example, and only the pressure seal is sealed in a special shape. In addition, each edge x1, x2 before and after the rotational direction of the ridge 10p substantially pressurizes only a part from one end to the other end in the width direction of the packaging sheet 2 and substantially from one end to the other end in the width direction. It is based on performing a continuous pressure seal.

  For example, when performing a linear pressure seal inclined with respect to the vertical direction as shown in FIG. 12, the pressure seal configuration shown in FIG. 7 is employed. In this case, the pressure roll 10 in which the convex streaks 10p are spirally formed on the outer peripheral surface is used. In the case of performing the inclined linear pressure seal shown in FIG. 13 described above, a pressure roll (not shown) in which the inclination directions of the convex streaks are alternately opposite is used. When the corrugated pressure seals 2c and 2c shown in FIG. 9 are performed, a pressure roll (not shown) having convex streaks extending in a corrugated shape along the width direction is used on the outer peripheral surface.

  Here, the advantage of the seal configuration of the present invention will be described again in detail by taking an example in the case of performing the wave-like pressure seal shown in FIG. Now, as shown stepwise in FIG. 15, when considering the state in which the front edge of the ridge of the roll comes into contact with the packaging sheet 2, as shown in FIGS. As for the strip, the position v1 that first comes into contact with the packaging sheet 2 in the roll width direction first shifts to the surface contact state, and the front edge of the convex strip that comes into contact with the packaging sheet 2 later is only the edge at the position. Is not in contact with the packaging sheet 2, but the ranges v2 and v3 including the portion where contact is started first and the surface contact state is shifted come into contact with the packaging sheet 2. That is, when forming a wavy pressure seal, at the start of contact, intermittent pressurization is performed in the width direction as shown in FIG. 5A, and thereafter, as shown in FIG. As shown, the contact area gradually increases not only in the width direction but also in the line flow direction starting from the contact start position v1. This is the opposite principle when the rear edge of the ridge is separated from the packaging sheet 2. Therefore, even if the cutting by the front and rear edges of the ridges occurs, the cutting is intermittently cut in the longitudinal direction of the packaging sheet 2 and the entire edge e2 on the lateral center side of the pressure seal portion S is cut. The situation is effectively prevented.

  Then, after the pressure seal S is thus made, the individually packaged absorption is performed by cutting the appropriate position (usually the center) in the middle of the line flow direction of the pressure seal portion S with a cutting device 11 such as a roll cutter device. A product is produced. Since points other than the pressure seal have been described in the section of the prior art, detailed description is omitted here.

(Other)
In addition to sanitary napkins, the present invention can be applied to known absorbent articles such as disposable disposable diapers, and is particularly suitable for absorbent articles where hygiene is a problem.

  As represented by sanitary napkins, the present invention can be applied to individually packaged absorbent articles and their manufacture.

It is a top view which shows a prior art example. It is II-II sectional drawing of FIG. It is III-III sectional drawing of FIG. It is IV-IV sectional drawing of FIG. It is a flowchart of a packaging process. It is a contrast figure which consists of sectional drawing and a top view which show the state transition of the conventional pressure seal. It is a contrast figure which consists of sectional drawing and a top view which show the state transition of the pressure seal which concerns on this invention. It is a perspective view which shows the individually packaged absorbent article which concerns on this invention. It is a top view which shows the individually packaged absorbent article which concerns on this invention. It is a top view which shows another example. It is a top view which shows another example. It is a top view which shows another example. It is a top view which shows another example. It is a top view which shows the example of a cutting | disconnection edge. It is the schematic which shows the state transition of the pressure seal which concerns on this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Absorbent article, 2 ... Packaging sheet, 3 ... Fastening tape, e1 ... Opening paper edge, e2 ... Lateral center edge, e3 ... Edge of packaging sheet.

Claims (3)

It consists of an absorbent article and a packaging sheet that wraps it,
The packaging sheet has a cylindrical shape in which both ends in the vertical direction perpendicular to the packaging line flow direction are overlapped, and the edge of the surface side portion of the overlapped portion is an opening start end, and the packaging line The overlapping portions at both ends in the lateral direction along the flow direction are pressure sealed, and the pressure sealing portion is formed so as to be substantially continuous from one end to the other end in the vertical direction . of lateral center side edge is laterally outer edge and opposite lateral center side linear entire edge is inclined against the longitudinal direction of, or curved, wavy or zigzag that not make,
An individually packaged absorbent article characterized in that. Entire edge of the lateral direction of the package sheet is the are parallel formed to correspond to the entire edge of the transverse direction central side and the lateral pressure sealed portions and packaged individually as claimed in claim 1, wherein Absorbent article. Send the belt-shaped packaging sheet to the packaging line,
Place the absorbent article on this belt-shaped packaging sheet,
Then, wrap the absorbent article placed by folding the widthwise one side and the other side end of the belt-shaped packaging sheet,
The strip-shaped wrapping sheet containing the absorbent article is passed between a pair of rolls having ridges that are substantially continuous from one end to the other end in the width direction, and before and after the line flow direction of the part containing the absorbent article. Applying a pressure seal that is substantially continuous from one end to the other end in the width direction by pressurizing the seal part between the ridges of one roll and the ridges of the other roll,
Thereafter, the intermediate position in the line flow direction in the pressure seal portion is cut to obtain an individually packaged absorbent article;
At the time of the pressure seal, each edge before and after the rotation direction of the ridge is linear, curved, wavy or zigzag inclined from the one end to the other end in the width direction of the packaging sheet. A pressure seal that is substantially continuous from one end to the other end in the width direction by the protrusions while simultaneously pressing only a part from one end to the other end in the width direction of the packaging sheet by each edge. To do the
A method for producing individually packaged absorbent articles.

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