JP7125870B2 - Absorbent article package - Google Patents

Description

The present invention relates to absorbent article packages.

Examples of absorbent articles include sanitary napkins, panty liners, and absorbent pads. For example, absorbent articles are known to have volatile substances, such as substances that provide a cooling sensation to the skin, as in US Pat. U.S. Patent No. 5,200,000 discloses packaging and sealing absorbent articles with a packaging material that does not reduce the amount of volatiles, wherein the packaging material has a content of about 0.020 to about 1 It is a multi-layer material with a thickness of 0.0 mm and having a barrier layer to prevent volatilization of volatiles.

Special Table No. 2007-525245

However, in packaging absorbent articles, the number of partially overlapping packaging materials may vary depending on the folding method and packaging method. For example, when packaging materials are sealed by welding, heat and pressure are applied uniformly to the welding points, which may cause excessive or insufficient welding depending on the number of overlapping packaging materials. rice field.

SUMMARY OF THE INVENTION The present invention has been made in view of the conventional problems as described above, and an object thereof is to provide an absorbent article package capable of appropriately welding packaging materials.

The main invention for achieving the above object is
An absorbent article and a packaging material for packaging the absorbent article,
The packaging material has at least a first layer, a second layer, and an intermediate layer positioned between the first layer and the second layer;
The packaging material is folded along the folding line direction of the packaging material, and the absorbent article is packaged,
An absorbent article package in which the ends of the packaging material in the folding line direction are welded,
The thickness of the packaging material is 4 μm or more and less than 20 μm ,
The absorbent article has a volatile substance,
The intermediate layer is a protective layer for preventing volatilization of the volatile substance,
at least one of the first layer or the second layer has an adhesive adhesive substance capable of adhering to the intermediate layer;
The absorbent article package is characterized in that the surface of the one layer opposite to the intermediate layer has less of the adhesive substance than the surface on the intermediate layer side .
Other features of the present invention will become apparent from the description of the specification and accompanying drawings.

According to the present invention, by setting the thickness of the packaging material to 4 μm or more and less than 20 μm, it becomes easier to evenly apply heat and pressure to the welding points than when a packaging material having a thickness of 20 μm or more is used. To reduce damage due to welding of materials and to facilitate more reliable joining.

FIG. 1 is a plan view of the unfolded package 50 viewed from the skin side. FIG. 2 is a plan view of the unfolded package 50 viewed from the non-skin side. FIG. 3A is a plan view of the package 50 in a packaged state as seen from the tape member 21 side. FIG. 3B is a plan view of the package 50 in the packaged state as seen from the opposite side of the tape member 21 side. FIG. 4 is a plan view of the napkin 1 viewed from the skin side. FIG. 5 is a plan view of the napkin 1 viewed from the non-skin side. FIG. 6 is a schematic cross-sectional view of the napkin 1 indicated by arrows AA in FIG. FIG. 7 is a diagram for explaining the application area of the cooling sensation material. FIG. 8 is a diagram explaining a cross section of the packaging material 20 in FIG. FIG. 9 is a diagram for explaining welding when using a conventional packaging material 200. As shown in FIG. FIG. 10 is a diagram for explaining welding when the packaging material 20 is used. 11A and 11B are diagrams for explaining separation forces at the first welded portion Wx, the second welded portion Wy2, and the third welded portion Wy3 of the package 50. FIG. 12A and 12B are diagrams for explaining the separating force at the first welded portion Wx and the third welded portion Wy3 of the package 500. FIG. FIG. 13 is an enlarged view of the Z section in FIG. 3A. FIG. 14 is a diagram illustrating a cross section of packaging material 20 of another embodiment.

At least the following matters will become apparent from the descriptions of this specification and the accompanying drawings.
An absorbent article and a packaging material for packaging the absorbent article, the packaging material comprising at least a first layer, a second layer, and an intermediate layer positioned between the first layer and the second layer The packaging material is folded along the folding line direction of the packaging material to wrap the absorbent article, and the ends of the packaging material in the folding line direction are welded. The absorbent article packaging body is characterized in that the thickness of the packaging material is 4 μm or more and less than 20 μm.

According to such an absorbent article package, by setting the thickness of the packaging material to 4 μm or more and less than 20 μm, heat and pressure are more evenly applied to the welding points than when a packaging material having a thickness of 20 μm or more is used. To reduce breakage due to welding of a packaging material by making it easy to add, and to facilitate more reliable joining.

In such an absorbent article package, it is desirable that the absorbent articles contain a volatile substance.

According to such an absorbent article package, it is possible to reduce the possibility that the volatile substance volatilizes due to the packaging material, so that the wearer can easily feel the effect of the volatile substance when wearing the absorbent article package.

In this absorbent article package, the intermediate layer is a protective layer for preventing volatilization of the volatile substance, and at least one of the first layer and the second layer is provided in the intermediate layer It is desirable to have an adhesive adhesive substance that can adhere.

According to such an absorbent article package, one layer and the intermediate layer can be adhered without using an adhesive, so that the packaging material can be formed thinner.

In such an absorbent article package, it is desirable that the surface of the one layer opposite to the intermediate layer contains less adhesive substance than the surface of the intermediate layer.

According to such an absorbent article package, since the surface opposite to the intermediate layer is a surface that is often welded in the welding of the packaging material, the adhesive substance should be less than the surface on the intermediate layer side. , the welding substance can be increased, and the welding can be made stronger.

In such an absorbent article package, it is desirable that a portion of the one layer corresponding to the end portion is provided with the adhesive substance.

According to such an absorbent article package, the absorbent article package can be wrapped more firmly by welding with the welding substance and adhesion with the adhesive substance.

In this absorbent article package, the intermediate layer is a protective layer for preventing volatilization of the volatile substance, and at least one of the first layer and the second layer and the intermediate layer It is desirable that they are adhered with an adhesive.

According to such an absorbent article package, it is possible to easily apply heat and pressure to the welded parts evenly.

In such an absorbent article package, the intermediate layer is a protective layer for preventing volatilization of the volatile substance, and the thickness of the one layer is preferably greater than the thickness of the intermediate layer.

According to such an absorbent article package, one layer tends to be provided with a larger amount of welding substance than when the thickness of one layer is smaller than the thickness of the intermediate layer. It becomes easy to do.

In such an absorbent article package, in the wrapped state, it has a thickness direction, the packaging material is folded multiple times, and two of the packaging materials are stacked in the thickness direction. A double portion and a triple portion in which three sheets are stacked are provided, and when in use, the side on which the first unfolded portion is located is the upper side, and the end portions of the double portion are the packaging materials. is welded as a first welded portion, and the portions where the packaging materials at the ends of the triple portion are welded together are referred to as a second welded portion and a third welded portion in order from the upper side, the third The force that separates the packaging materials from each other at the welding portion is stronger than the force that separates the packaging materials from each other at the second welding portion, and the force that separates the packaging materials from each other at the third welding portion. and the force separating the welding of the packaging materials at the first welding portion is preferably smaller than 0.1N.

According to such an absorbent article package, the wearer can open the absorbent article package with a constant force, so that the opening operation can be easily performed.

In such an absorbent article package, in the wrapped state, it has a thickness direction, the packaging material is folded multiple times, and two of the packaging materials are stacked in the thickness direction. A double portion and a triple portion in which three sheets are stacked are provided, and when in use, the side on which the first unfolded portion is located is the upper side, and the end portions of the double portion are the packaging materials. is welded as a first welded portion, and the portions where the packaging materials at the ends of the triple portion are welded together are referred to as a second welded portion and a third welded portion in order from the upper side. It is preferable that each of the welding parts, the second welding part, and the third welding part has a force of less than 1.2N for separating the welding parts of the packaging materials.

According to such an absorbent article package, the wearer can open the absorbent article package with less force.

In such an absorbent article package, in the wrapped state, it has a thickness direction, the packaging material is folded multiple times, and two of the packaging materials are stacked in the thickness direction. A double portion and a triple portion in which three sheets are stacked are provided, and when in use, the side on which the first unfolded portion is located is the upper side, and the end portions of the double portion are the packaging materials. is welded as a first welded portion, and the portions where the packaging materials at the ends of the triple portion are welded together are referred to as a second welded portion and a third welded portion in order from the upper side, the third The difference between the force separating the packaging materials from each other at the welding portion and the force separating the packaging materials from each other at the first welding portion separates the welding between the packaging materials at the first welding portion. Less than 1/2 the force is desirable.

According to such an absorbent article package, the difference between the force that separates the packaging materials from each other at the third welded portion and the force that separates the packaging materials from each other at the first welded portion is equal to the first welded portion. Since the wearer can open the absorbent article package with a constant force, the opening operation can be easily performed than when the force is greater than 1/2 of the force that separates the packaging materials from each other. .

In this absorbent article package, the difference between the force for separating the welding of the packaging materials at the third welding portion and the force for separating the welding between the packaging materials at the first welding portion is It is desirable that the force is less than ⅓ of the force that separates the welding of the packaging materials at one welding portion.

According to such an absorbent article package, the difference between the force that separates the packaging materials from each other at the third welded portion and the force that separates the packaging materials from each other at the first welded portion is equal to the first welded portion. The wearer can open the absorbent article package with a constant force than when the force for separating the welding of the packaging materials in .

In this absorbent article package, the difference between the force for separating the welding of the packaging materials at the third welding portion and the force for separating the welding between the packaging materials at the first welding portion is It is desirable that the force is less than 1/10 of the force that separates the packaging materials from one welded portion.

According to such an absorbent article package, the difference between the force that separates the packaging materials from each other at the third welded portion and the force that separates the packaging materials from each other at the first welded portion is equal to the first welded portion. Since the wearer can open the absorbent article package with a constant force, the opening operation can be easily performed than when the force for separating the welding of the packaging materials in .

The absorbent article package has a thickness direction in the packaged state, the packaging material has a tape member, the tape member has a peelable part that can be peeled off when unsealed, and the A fixed part fixed to the packaging material is provided, and the packaging material is folded multiple times, and in the thickness direction, a double part in which two sheets of the packaging material are stacked and a triple part in which three sheets of the packaging material are stacked. is provided, and when in use, the side on which the first unfolded portion is located is the upper side, and the portion where the packaging materials at the ends of the double portion are welded together is the first welded portion, and the If the portions where the packaging materials are welded together at the ends of the triple portion are referred to as a second welded portion and a third welded portion in order from the upper side, a force separating the welding of the packaging materials at the first welded portion. , the force for separating the welding of the packaging materials at the second welding portion, and the force for separating the welding between the packaging materials at the third welding portion than the force for peeling the peeling portion from the packaging material, respectively. Small is desirable.

According to such an absorbent article package, the force to separate the packaging materials from each other at the first welded portion, the force to separate the packaging materials from each other by welding at the second welded portion, and the force to separate the packaging materials from each other at the third welded portion The absorbent article package can be opened more easily than when the force for separating the welded portions is greater than the force for peeling the peeling portion from the packaging material.

The absorbent article package has a thickness direction in the packaged state, the absorbent article has an adhesive area on the non-skin side, and the wrapping material protects the adhesive area. A protective sheet is provided, the packaging material is folded multiple times, and in the thickness direction, a double part in which two sheets of the packaging material are stacked and a triple part in which three sheets of the packaging material are stacked are provided, When in use, the side on which the portion that is deployed first is located is the upper side, the portion where the end portions of the double portion are welded together is the first weld portion, and the end portion of the triple portion is the first weld portion. The portions where the packaging materials are welded to each other are referred to as a second welded portion and a third welded portion in order from the upper side. It is desirable that the force for separating the welding of the packaging materials at the third welded portion and the force for separating the welding between the packaging materials at the third welding portion are each larger than the force for separating the absorbent article from the protective sheet.

According to such an absorbent article package, the force to separate the packaging materials from each other at the first welded portion, the force to separate the packaging materials from each other by welding at the second welded portion, and the force to separate the packaging materials from each other at the third welded portion The strength of the welding can be improved as compared with the case where the force separating the welds is smaller than the force separating the absorbent article from the wrapping material.

In such an absorbent article package, the absorbent article contains a volatile substance, the end portion has a welded area where the packaging materials are welded together, and the folded portion of the welded area is folded. It is desirable that the force for separating the welding of the packaging materials at the outer end in the line direction is larger than the force for separating the welding between the packaging materials at the inner end in the folding line direction of the welding region. .

According to such an absorbent article package, of the welded regions, the inner side in the direction of the fold line can be opened with a weaker force, while the outer side in the direction of the fold line is welded more strongly. It is possible to reduce the risk of substances volatilizing.

===First embodiment===
Hereinafter, an embodiment will be described by taking a sanitary napkin as an example of an absorbent article according to the present invention. Any absorbent article that is fixed and used may be used.

<<Basic configuration of package 50>>
FIG. 1 is a plan view of a package (also referred to as a “napkin 1 package” or “absorbent article package”) 50 in an unfolded state, viewed from the skin side. FIG. 2 is a plan view of the unfolded package 50 viewed from the non-skin side. 3A is a plan view of the package 50 in the wrapped state as seen from the tape member side, and FIG. 3B is a plan view of the package 50 in the wrapped state as seen from the side opposite to the tape member side. The package 50 in the unfolded state and the package 50 in the wrapped state each have a longitudinal direction, a width direction, and a thickness direction orthogonal to each other. The package 50 includes a sanitary napkin 1 (hereinafter also referred to as “napkin 1 ”) and a packaging material for packaging the napkin 1 . In FIGS. 3A and 3B, directions along the folding lines F1 and F2 are referred to as folding line directions. As shown in FIG. 3A, a tape member 21 is provided at the end of the packaging material 20 on the front side of the napkin 1 in the unfolded state. When unsealing, the wearer first grasps the tape member 21 and pulls the tape member 21 to unfold the packaging material 20.例文帳に追加

As shown in FIGS. 1 and 2, the package 50 in the "unfolded state" refers to a state in which the package 50 is unsealed and all folded portions are unfolded. As shown in FIGS. 3A and 3B, the package 50 in the "wrapped state" means that a predetermined portion of the package 50 in the unfolded state, specifically, a pair of wing portions is folded inward in the width direction, It refers to a state in which the wrapping material 20 is folded with the skin-side sheet inside along the first folding line F1 and the second folding line F2, and the end portions 20e in the folding line direction of the packaging material 20 are welded to seal. The package 50 has two folding lines, a first folding line F1 and a second folding line F2, and the first folding line F1 is the first folding line to unfold from the packaged state. , the folding line F2 is the last folding line to unfold from the wrapped state to the unfolded state.

<<Basic configuration of sanitary napkin 1>>
FIG. 4 is a plan view of the sanitary napkin 1 viewed from the skin side. FIG. 5 is a plan view of the napkin 1 viewed from the non-skin side. FIG. 6 is a schematic cross-sectional view of the napkin 1 indicated by arrows AA in FIG. FIG. 7 is a diagram for explaining the application area of the cooling sensation material.

The napkin 1 has a longitudinal direction, a width direction and a thickness direction perpendicular to each other. In the longitudinal direction of the napkin 1, the side that contacts the lower abdomen of the user is called the "front side", and the side that contacts the buttocks of the user is called the "rear side". In addition, in the thickness direction of the napkin 1, the side that contacts the user's skin is called the "skin side", and the opposite side is called the "non-skin side". The longitudinal direction of the napkin 1 is also the longitudinal direction in the unfolded state 50 . The XX line in the figure is the center line in the width direction.

The napkin 1 has a pair of wing portions 1W extending from a central portion in the longitudinal direction to both lateral sides in the width direction. Hereinafter, in the longitudinal direction of the napkin 1, the portion provided with the wing portion 1W is referred to as a central portion 1B, the portion forward of the central portion 1B as a front portion 1A, and the portion rearward of the central portion 1B as a rear portion 1C.

The napkin 1 has a skin-side sheet 2 , an intermediate sheet 3 , an absorbent body 10 , a non-skin-side sheet 4 , and a side sheet 6 at the central portion in the width direction. A skin-side sheet 2, an intermediate sheet 3, an absorbent body 10, and a non-skin-side sheet 4 are laminated in order from the skin side in the thickness direction. It is arranged over the width direction end of the non-skin side surface of the absorber 10 from the part. The skin-side sheet 2, the intermediate sheet 3, the absorbent body 10, the non-skin-side sheet 4, and the side sheets 6 are each joined and fixed using an adhesive such as a hot-melt adhesive. The adhesive is applied in an arbitrary pattern over the skin side and non-skin side of each member, and the pattern can be selected from Ω patterns, spiral patterns, stripe patterns, and the like. In addition, in FIG. 6 and the like, the adhesive is omitted for the sake of convenience.

The skin-side sheet 2 and the intermediate sheet 3 are liquid-permeable sheet members, and examples thereof include air-through nonwoven fabrics. The skin-side sheet 2 is a white sheet member, and the intermediate sheet 3 is a pale green sheet member. The wing sheets 5 and the side sheets 6 are hydrophobic sheet members, and examples thereof include air-through nonwoven fabrics and spunbonded nonwoven fabrics. The non-skin-side sheet 4 is a liquid-impermeable sheet member, and can be exemplified by a polyethylene (PE) resin film or the like. The non-skin side sheet 4 has a planar size larger than that of the absorbent body 10 and covers the entire planar surface of the absorbent body 10 . The wing sheet 5, the side sheet 6, and the non-skin side sheet 4 are white sheet members.

The wing portions 1W are formed of side sheets 6 and non-skin-side sheets 4 extending outward from both sides of the skin-side sheet 2 in the width direction. In addition, the form which does not have the wing part 1W may be sufficient as the napkin 1. FIG.

The absorbent body 10 is a member that absorbs and holds excrement inside. The absorbent body 10 has an absorbent core (not shown) and a cover sheet (not shown) covering the absorbent core. The absorbent core is formed into a predetermined shape by adding a superabsorbent polymer (so-called SAP), which is a liquid-absorbent granule, to pulp fibers, cellulose-based absorbent fibers, etc., which are liquid-absorbent fibers. is. The cover sheet is a liquid-permeable sheet and can be exemplified by tissue.

In the napkin 1, a green sheet member was used for the intermediate sheet 3, but a colored sheet member was used for any one of the skin side sheet 2, the intermediate sheet 3, the wing sheet 5, the side sheet 6, and the non-skin side sheet 4. is preferably used. At this time, by using a cold color sheet such as blue, light blue, or green, it becomes easier to give a cool impression to the wearer.

As shown in FIG. 4, it can be seen that the napkin 1 has a snow display S1 representing snow crystals, a snow display S2, and a plurality of compressed linear portions E when viewed from the side of the skin. The snow display S1 and the snow display S2 are figures representing snowflakes, respectively, and are reminder displays for reminding that the napkin 1 is provided with a cooling sensation material. Since there is a general notion that snow is cold, the wearer can easily remember that the napkin 1 has a cooling sensation material by visually recognizing the display of snow crystals.

The plurality of linearly compressed parts E are shaped to surround the region where the vaginal opening of the wearer is expected to come into contact when worn, and are provided in a shape that follows the shape of the absorbent body 10 . The linear compressed portion E is a compressed portion formed into a desired shape by compressing the skin-side sheet 2, the intermediate sheet 3, and the absorbent body 10 from the thickness direction. Due to the compression, the fiber density of the skin-side sheet 2, the fiber density of the intermediate sheet 3, and the fiber density of the absorbent body 10 become higher than those of the non-compressed portion. By providing the linear compressed portion E, the excrement is prevented from diffusing outside a predetermined range, and the risk of leakage of the excrement from the napkin 1 is reduced.

The non-skin side of the napkin 1 (that is, the non-skin side of the non-skin side sheet 4) is provided with a central adhesive portion 8 coated with an adhesive or the like. As shown in FIG. 5, the central adhesive portion 8 has a plurality of rectangular central adhesive portions 8 having long sides in the longitudinal direction and are arranged at intervals in the width direction. The number and arrangement are not limited to this. When the napkin 1 is used, the central adhesive part 8 is attached to the side of the skin of clothing such as underwear, so that the napkin 1 is fixed to the underwear or the like.

Similarly, a wing adhesive portion 9 is provided on the non-skin side (the non-skin side of the non-skin side sheet 4) in the thickness direction of each wing portion 1W. As shown in FIG. 5, the wing adhesive portion 9 includes a plurality of rectangular wing adhesive portions 9 having long sides in the longitudinal direction and arranged at intervals in the width direction. The number and arrangement are not limited to this. When the napkin 1 is used, the wing portion 1W is folded toward the non-skin side, and the wing adhesive portion 9 is adhered to the non-skin side of underwear or the like. As a result, the wing portion 1W is fixed to the underwear or the like.

The napkin 1 preferably comprises a cooling sensation material, a warming sensation material, or a volatile substance such as perfume. The napkin 1 includes a cooling sensation material containing a compound that gives a cool or refreshing sensation to the wearer between the skin-side sheet 2 and the intermediate sheet 3 . The cooling sensation material is a volatile substance, and liquids containing menthol and menthyl lactate can be exemplified. The cooling sensation material is applied to the front or back surface of the skin-side sheet 2, the front or back surface of the intermediate sheet 3, the absorbent body 10, or the like, in a desired location and in a predetermined application pattern according to the effect of the cooling sensation material. can be done. For example, the napkin 1 is coated with a liquid cooling sensation material on the non-skin side of the skin-side sheet 2 at the time of manufacture. FIG. 7 shows the application area Q of the cooling sensation material. As shown in FIG. 7, the cooling sensation material of the napkin 1 is continuously applied to the center region in the width direction from the front end to the rear end in the longitudinal direction.

An oil film layer R is provided on the skin side surface of the skin-side sheet 2 in a region that is expected to come into contact with the vaginal opening of the wearer when worn. As the oil film layer R, an oil film such as triacylglycerol is used to prevent the cooling sensation material from coming into direct contact with the wearer's genitals, thereby facilitating the appropriate cooling effect on the wearer.

<<About the packaging material 20>>
The packaging material 20 is a sheet-like packaging member that individually wraps the napkin 1, and is a member that is removed when the napkin 1 is used. In the unfolded state, the surface in contact with the napkin 1 is called the inner surface, and the surface opposite to the inner surface is called the outer surface. The packaging material 20 has a design based on green, and as shown in FIGS. there is The reminder M1, the reminder M2, and the reminder M3 are reminders for reminding that the napkin 1 is provided with a cooling sensation material. In general, the sea and ice cream have a conceptually cool impression, and the character "cool" expresses "cool." Even before using the napkin 1, the wearer can easily remember that the napkin 1 has a cooling sensation material by visually recognizing the reminder indications M1, M2, and M3 on the packaging material 20. .

As the material of the packaging material 20, for example, various films such as plastic films and nylon films, non-woven fabrics, films obtained by laminating non-woven fabrics, and the like can be used. Specifically, as shown in FIG. 8, the packaging material 20 has a first layer 20a located on the inner surface of the packaging material 20, a second layer 20b located on the outer surface, and a layer between the first and second layers. has an intermediate layer located at FIG. 8 is a diagram explaining a cross section of the packaging material 20 in FIG.

The first layer 20a and the second layer 20b are modified polyethylene sheets (modified PE) containing 10% or more maleic acid as an adhesive resin (adhesive substance), and the intermediate layer 20c is an ethylene-vinyl alcohol copolymer. It is a sheet (EVOH). It is preferable that at least the surfaces of the first layer 20a and the second layer 20b that are in contact with the intermediate layer 20c contain an adhesive resin. For the first layer 20a and the second layer 20b, a welding substance is used that enables the packaging materials 20 to be welded to each other for the packaging state. For example, instead of polyethylene (PE), a weldable resin such as polypropylene (PP) may be used for the first layer 20a and the second layer 20b. The intermediate layer 20c is preferably made of a material that can prevent volatilization of volatile substances. Since the napkin 1 includes a cooling sensation material, it is preferable to use a material that can prevent volatilization of the cooling sensation material.

The bonding of the first layer 20a and the intermediate layer 20c and the bonding of the intermediate layer 20c and the second layer 20b were performed by heating the intermediate layer 20c to about 76° C. while sandwiching the intermediate layer 20c between the first layer 20a and the second layer 20b. By applying pressure while applying pressure, the adhesive resin is melted and adhered. In other words, by using modified PE for the first layer 20a and the second layer 20b, each layer can be adhered without applying an adhesive or the like, so the thickness of the packaging material 20 can be made thinner than when an adhesive is used. can do.

Specifically, the thickness of the first layer 20a is 6 μm, the intermediate layer 20c is 4 μm, the second layer 20b is 6 μm, and the thickness of the packaging material 20 is 16 μm. The packaging material 20 has a thickness of 4 μm or more and less than 20 μm. Preferably, the first layer 20a or the second layer 20b is thicker than the intermediate layer 20c. Since the first layer 20a and the second layer 20b are provided with a welding substance such as PE, the welding of the packaging material can be made stronger than when the thickness of the intermediate layer 20c is thinner than that of the intermediate layer 20c. In addition, when the napkin 1 contains a volatile substance, it is preferable that the intermediate layer 20c has a thickness of at least 2 μm or more.

Moreover, it is preferable that the portion corresponding to the end portion 20e of the first layer 20a or the second layer 20b is provided with the adhesive resin. By applying heat and pressure in the welding process, the adhesiveness of the adhesive resin can be easily exhibited, and the end portion 20e is not only welded with a welding substance such as PE, but also adhered with an adhesive substance. Stronger bonding can be achieved.

The joining of the ends 20e of the packaging material 20 to obtain the packaged state shown in FIGS. 3A and 3B may differ in the number of partially overlapped packaging materials 20 depending on the folding method of the package 50. FIG. FIG. 9 is a diagram for explaining welding when using a conventional packaging material 200. As shown in FIG. FIG. 10 is a diagram for explaining welding when the packaging material 20 is used. FIGS. 9 and 10 show a packaging body 500 and a packaging body 50, respectively, having two folding lines, which are schematically illustrated with a thickness greater than the actual thickness for the sake of convenience, and the napkins and tape members are omitted in each figure. . 9 and 10 is the direction perpendicular to the folding line, and in FIGS. 9 and 10, the side on which the portion that is first unfolded during use is located is the upper side.

The packaging material 200 shown in FIG. 9 has a thickness t of about 32 μm. The packaging body 500 has double portions x, x in which two packaging materials 200 are stacked on one side and the other side in the direction perpendicular to the folding line in the thickness direction, and the double portion x and the double portion x It has a triple portion y in which three packaging materials 200 are stacked between them. In addition, the portions where the packaging materials 200 are welded together in the fold line direction of the double portions x are the first welding portions Wx, Wx, respectively, and the packaging materials 200 at the edges of the triple portion y are welded together. The welded portions are the second welded portion Wy2 and the third welded portion Wy3 in order from the top. The thickness of the double portion x is about 2t, and the thickness of the triple portion y is about 3t at the end of the folding line direction of the package 500. Therefore, the difference in thickness between the double portion x and the triple portion y is becomes t, which is the thickness of the packaging material 200 . At this time, in the welding process, a roller or the like is used to uniformly apply heat and pressure to the welded portion. Stronger pressure is applied to the third welded portion Wy3 located below the triple portion y, which has a large number of layers, and there is a risk that the packaging material 200 will be torn. On the other hand, if the heat and pressure are reduced in the welding process in order to prevent damage to the packaging material 200 at the third welded portion Wy3, the pressure for welding is applied to the double portion x, where the number of stacked packaging materials 200 is small. There is a fear that the joint by welding will not be sufficiently performed.

In this regard, since the thickness T of the packaging material 20 is 4 μm or more and less than 20 μm (4 μm≦T<20 μm), it is possible to reduce damage to the packaging material 20 due to welding and more reliably join by welding. can. In order to reduce the risk of damage to the packaging material 20 itself during transportation, the thickness T of the packaging material 20 is set to 4 μm or more, and the welding difference between the double portion X and the triple portion T is made more uniform. , the thickness T of the packaging material is less than 20 μm. For example, if the thickness T of the packaging material is 16 μm and 100 end portions 20e of the packages 50 are welded, 75 packages 50 that are neither damaged nor insufficiently welded can be manufactured.

The packaging material 20 shown in FIG. 10 has a thickness T of about 16 μm. The packaging body 50 has double portions X, X in which two packaging materials 20 are stacked on one side and the other side in the direction perpendicular to the folding line in the thickness direction, and the double portion X and the double portion X It has a triple portion Y in which three packaging materials 20 are stacked between them. Further, the portions where the packaging materials 20 of the ends 20e of the double portions X and X are welded together are the first welded portions WX and WX, respectively, and the packaging materials 200 of the ends 20e of the triple portion Y are welded together. The portions are the second welded portion WY2 and the third welded portion WY3 in order from the top. At the end 20e of the package 50, the thickness of the double portion X is about 2T and the thickness of the triple portion Y is about 3T. T is the thickness of the material 20 . In other words, since the thickness T of the packaging material 20 is thinner than the thickness t of the conventional packaging material 200 (t>T), as shown in FIG. The difference in thickness can be made smaller than the difference in thickness between the double portion x and the triple portion y of the conventional package 500 . As a result, heat and pressure can be more uniformly applied to the package 50 than when a packaging material having a thickness of 20 μm or more is used, so that the packaging material 20 may be partially welded strongly and damaged. It is possible to reduce the risk of looseness or partial insufficient welding.

In addition, by welding and joining the packaging material 20 in a more uniform state, even if the napkin 1 includes a volatile substance such as a cooling sensation material like the packaging 50, the volatile substance can be removed from the packaging 50. volatilization can be reduced, and the wearer can easily feel the effect of the volatile substance when wearing it.

In addition, the difference in the force (hereinafter also referred to as “separation force”) for separating the welding of the packaging materials 20 at the first welded portion Wx, the second welded portion Wy2, and the third welded portion Wy3 of the package 50 is also smaller. can do. 11A and 11B are diagrams for explaining separation forces at the first welded portion Wx, the second welded portion Wy2, and the third welded portion Wy3 of the package 50. FIG. FIG. 11 shows a state in which the welding portions Wx, Wy2, and Wy3 are separated from each other for the sake of convenience. The separating force of the package 50 is the largest in the order of the first welded portion Wx, the second welded portion Wy2, and the third welded portion Wy3. The difference between the first welded portion Wx with the smallest separating force and the third welded portion Wy3 with the largest separating force can be made smaller than 0.1N.

12A and 12B are diagrams for explaining the separating force at the first welded portion Wx and the third welded portion Wy3 of the package 500. FIG. In FIG. 12, the bar graph shows the magnitude of the separating force at the first welded portion Wx and the third welded portion Wy3, and the line graph shows the difference in the separating force between the first welded portion Wx and the third welded portion Wy3 ( 3rd weld Wy3-first weld Wx). The package 500 is welded at a welding temperature of 120 degrees, and the results of 108 degrees, 112 degrees, and 114 degrees are shown for reference. The results of welding at 120 degrees will be described below.

As shown in FIG. 12, the difference in separating force between the first welded portion Wx and the third welded portion Wy3 in the package 500 is 0.99N. This difference in separation force is due to the difference in heat and pressure applied due to the difference in thickness of the packaging material 200 during the welding process. In opening the package 500, generally, first, the second welded portion Wy2 is separated, then the first welded portion Wx on one side and the third welded portion Wy3 are separated, and finally the other side is separated. to separate the first welded portion Wx. At this time, if there is a large difference in separation force between the welded portions Wx, Wy2, and Wy3, the wearer may find it difficult to open the bag because the wearer needs to apply different force when opening the respective portions.

In this regard, by making the difference between the first welded portion Wx and the third welded portion Wy3 smaller than 0.1 N in the packaging body 50, the wearer can easily open the package with a constant force. becomes easier.

The magnitude of the separating force of each welded portion Wx, Wy2, Wy3 is measured by the following method. The welded portion Wx will be described. First, in the region of the first welded portion Wx, the first welded portion Wx of the end portion 20e is cut by cutting 40 mm inward from the edge of the package 50 along the folding line direction and 18 mm in the direction orthogonal to the folding line direction. Form a sample piece containing: Subsequently, the upper sheet (packaging material 20) of the sample piece is fixed to the chuck on one side, and the lower sheet (packaging material 20) is fixed to the chuck on one side. Then, using a universal material testing machine (Instron), the chuck interval was set to 10 mm, and the peeling mode of the universal material testing machine was set to a peeling angle of 180 degrees and a peeling speed of 100 mm / min. Spread until the bottom sheet separates and measure the force to separate the bottom sheet from the top sheet. The same applies to the second welded portion Wy2, the third welded portion Wy3, the first welded portion WX, the second welded portion WY2, and the third welded portion WY3.

Further, it is more preferable that each of the forces for separating the first welded portion Wx, the second welded portion Wy2, and the third welded portion Wy3 is less than 1.2N. If the separation force is greater than 1.2 N, the wearer tends to apply force to separate the first welded portion Wx, the second welded portion Wy2, and the third welded portion Wy3 to open the package 50. However, if the separation force is less than 1.2 N, the wearer can open the package 50 with a light force.

The difference between the separating force of the first welded portion Wx and the separating force of the third welded portion Wy3 is preferably smaller than 1/2 of the separating force of the first welded portion Wx ((third welded portion Wy3 - first welded portion Wx) > 1/2). More preferably, the difference between the separating force of the first welded portion Wx and the separating force of the third welded portion Wy3 is preferably smaller than 1/3 of the separating force of the first welded portion Wx ((third welded portion Wy3 - third 1 welded portion Wx) > 1/3), and more preferably, the difference between the separating force of the first welded portion Wx and the separating force of the third welded portion Wy3 is smaller than 1/10 of the separating force of the first welded portion Wx. ((third welded portion Wy3−first welded portion Wx)>1/10). By doing so, it becomes easier for the wearer to apply a constant force when opening, and the wearer's opening operation can be facilitated.

As shown in FIG. 3A and the like, the tape member 21 includes a peelable portion 21r that can be peeled off when unsealed, and a fixed portion 21s that is fixed to the packaging material 20. As shown in FIG. It is more preferable that the separating force of the first welded portion Wx, the separating force of the second welded portion Wy2, and the separating force of the third welded portion Wy3 are smaller than the force for peeling the peeling portion 21r from the packaging material 20, respectively. By doing so, when the separating force of the first welded portion Wx, the separating force of the second welded portion Wy2, and the separating force of the third welded portion Wy3 are each greater than the force for peeling the tape member 21r from the packaging material 20. Therefore, it is possible to open the package 50 with less force.

Furthermore, the package 50 includes a protective sheet (not shown) that protects the central adhesive portion 8 on the non-skin side of the napkin 1, and the protective sheet is attached to the central adhesive portion 8 in the wrapped state and the unfolded state. At this time, it is more preferable that the separating force of the first welded portion Wx, the separating force of the second welded portion Wy2, and the separating force of the third welded portion Wy3 are greater than the force for separating the protective sheet from the napkin 1. By doing so, the protective sheet is attached to the central adhesive portion 8 in the state and the unfolded state. At this time, when the separating force of the first welded portion Wx, the separating force of the second welded portion Wy2, and the separating force of the third welded portion Wy3 are smaller than the force separating the protective sheet from the napkin 1, the welded state is stronger. Therefore, the possibility of unintentionally opening the package 50 can be reduced.

FIG. 13 is an enlarged view of the Z section in FIG. 3A. In FIG. 13, the right side in the folding line direction is the outside, and the left side is the inside. The end portion 20e has a plurality of rectangular welded portions g, and a set of the plurality of welded portions g is referred to as a welded region G. As shown in FIG. The force that separates the welding of the packaging materials 20 at the outer edge Ge in the folding line direction of the welding region G separates the welding of the packaging materials 20 at the inner edge Gi of the welding region G in the folding line direction. preferably greater than the force. By doing so, the inner end portion Gi can be opened with a weaker force, so that the inner end portion Gi can be opened with a smaller force when starting to unseal from the wrapped state to the unfolded state. On the other hand, since the outer portion Ge is welded more strongly, when the napkin 1 includes a volatile substance such as a cooling sensation material, it is possible to reduce the risk of volatilization of the volatile substance from the package 50. can. The outer end Ge and the inner end Gi having different forces for separating the welding of the packaging materials 20 can be formed by performing welding using rollers having protrusions with different heights in the welding process.

===Other Embodiments===
Although the embodiments of the present invention have been described above, the above-described embodiments are intended to facilitate understanding of the present invention, and are not intended to limit and interpret the present invention. Further, the present invention can be modified and improved without departing from its spirit, and it goes without saying that the present invention includes equivalents thereof. For example, the following modifications are possible.

In the above-described embodiment, the first layer 20a and the second layer 20b each contain an adhesive resin capable of adhering to the intermediate layer 20c, but this is not necessarily the case. Either the first layer 20a or the second layer 20b may contain an adhesive resin, or both the first layer 20a and the second layer 20b may contain no adhesive resin. good too. For example, the packaging material 20 may be a packaging material having other layers in addition to the first layer 20a, the second layer 20b, and the intermediate layer 20c. For example, FIG. 14 is a diagram illustrating a cross section of packaging material 20 of another embodiment. The packaging material 20 shown in FIG. 14 has a first layer 20a, an adhesive layer H, an intermediate layer 20b, an adhesive layer H, and a second layer 20c which are superimposed in this order from the inner surface in the state of the unfolded packaging material 20. It is The first layer 20a and the intermediate layer 20c are adhered by the adhesive layer H, and the intermediate layer 20c and the second layer 20b are adhered by the adhesive layer H. Even with the packaging material 20 having such a configuration, by setting the thickness T of the packaging material 20 to 4 μm or more and less than 20 μm (4 μm≦T<20 μm), damage to the packaging material 20 due to welding can be reduced and the Joining by welding can be reliably performed.

Moreover, although the packaging material 20 including the first layer 20a, the second layer 20b, and the intermediate layer 20c is used in the above-described embodiment, the present invention is not limited to this. For example, a third layer (not shown) made of another sheet material may be provided between the first layer 20a and the intermediate layer 20c. Each layer 20a, 20b, 20c, etc., of the packaging material 20 can be appropriately changed according to the shape of the napkin 1, the volatile substance contained in the napkin 1, and the like.

Furthermore, with respect to the first layer 20a or the second layer 20b, the surface opposite to the intermediate layer 20c contains less adhesive resin than the surface facing the intermediate layer 20c, and the welding substance such as PE is increased. good too. The surface on the opposite side of the intermediate layer 20c is the surface where the packaging material 20 is more heavily welded, and is a region that requires welding with a welding substance rather than the adhesive effect of the adhesive resin. Therefore, by increasing the amount of the welding substance, it becomes easier to make the welding stronger.

In the above-described embodiment, the packaging material 20 is provided with the recall marks M1, M2, M3, etc., but these patterns and the coloring of the packaging material 20 may be printed using ink such as acrylic pigments. . The ink can reduce the separation force due to welding of the packaging materials 20 to each other. Therefore, the strength of welding between the packaging materials 20 can be adjusted by adjusting the printing position and the amount of ink in the packaging material 20 .

1 napkin (absorbent article),
1A front part, 1B central part, 1C rear part, 1W wing part,
2 skin side sheet, 3 intermediate sheet,
4 non-skin side sheet, 6 side sheet,
8 central adhesive portion, 9 wing adhesive portion,
10 absorber,
20 packaging material,
20a first layer, 20b second layer, 20c intermediate layer,
20e end,
50 package (absorbent article package),
E linear pressing section,
F1 first folding line, F2 second folding line,
G Product name display,
M1 recall display, M2 recall display, M3 recall display,
R oil film layer,
S1 snow display (recall display), S2 snow display (remember display),
X double part, Y triple part,
WX 1st welded part, WY2 2nd welded part, WY3 3rd welded part

Claims (11)

An absorbent article and a packaging material for packaging the absorbent article,
The packaging material has at least a first layer, a second layer, and an intermediate layer positioned between the first layer and the second layer;
The packaging material is folded along the folding line direction of the packaging material, and the absorbent article is packaged,
An absorbent article package in which the ends of the packaging material in the folding line direction are welded,
The thickness of the packaging material is 4 μm or more and less than 20 μm ,
The absorbent article has a volatile substance,
The intermediate layer is a protective layer for preventing volatilization of the volatile substance,
at least one of the first layer or the second layer has an adhesive adhesive substance capable of adhering to the intermediate layer;
The absorbent article package , wherein the surface of the one layer opposite to the intermediate layer has less of the adhesive substance than the surface of the intermediate layer . The absorbent article package according to claim 1 ,
A package for absorbent articles, wherein a portion of the one layer corresponding to the end portion is provided with the adhesive substance. The absorbent article package according to claim 1 or 2 ,
The absorbent article package, wherein the thickness of the one layer is greater than the thickness of the intermediate layer. The absorbent article package according to any one of claims 1 to 3 ,
In the packaged state, having a thickness direction,
The packaging material is folded multiple times,
In the thickness direction, a double portion in which two of the packaging materials are stacked and a triple portion in which three of the packaging materials are stacked are provided,
At the time of use, the side on which the first deployed part is located is the upper side,
A portion where the packaging materials of the end portion of the double portion are welded together is defined as a first weld portion,
If the parts of the triple part where the packaging materials are welded to each other at the ends are referred to as a second welded part and a third welded part in order from the upper side,
The force that separates the packaging materials from each other by welding at the third welding portion is stronger than the force that separates the packaging materials from each other by welding at the second welding portion,
The difference between the force for separating the welding of the packaging materials at the third welding portion and the force for separating the welding between the packaging materials at the first welding portion is smaller than 0.1N. Goods package. The absorbent article package according to any one of claims 1 to 4 ,
In the packaged state, having a thickness direction,
The packaging material is folded multiple times,
In the thickness direction, a double portion in which two of the packaging materials are stacked and a triple portion in which three of the packaging materials are stacked are provided,
At the time of use, the side on which the first deployed part is located is the upper side,
A portion where the packaging materials of the end portion of the double portion are welded together is defined as a first weld portion,
If the parts of the triple part where the packaging materials are welded to each other at the ends are referred to as a second welded part and a third welded part in order from the upper side,
A package for absorbent articles, wherein a force for separating the welding of the packaging materials at the first welding portion, the second welding portion, and the third welding portion is less than 1.2 N, respectively. The absorbent article package according to any one of claims 1 to 5 ,
In the packaged state, having a thickness direction,
The packaging material is folded multiple times,
In the thickness direction, a double portion in which two of the packaging materials are stacked and a triple portion in which three of the packaging materials are stacked are provided,
At the time of use, the side on which the first deployed part is located is the upper side,
A portion where the packaging materials of the end portion of the double portion are welded together is defined as a first weld portion,
If the parts of the triple part where the packaging materials are welded to each other at the ends are referred to as a second welded part and a third welded part in order from the upper side,
The difference between the force that separates the packaging materials from each other at the third welding portion and the force that separates the packaging materials from each other at the first welding portion is the welding between the packaging materials at the first welding portion. An absorbent article package, characterized in that it is less than 1/2 of the force that separates the two. The absorbent article package according to claim 6 ,
The difference between the force that separates the packaging materials from each other at the third welding portion and the force that separates the packaging materials from each other at the first welding portion is the welding between the packaging materials at the first welding portion. The absorbent article package is less than ⅓ of the force that separates the two. The absorbent article package according to claim 7 ,
The difference between the force that separates the packaging materials from each other at the third welding portion and the force that separates the packaging materials from each other at the first welding portion is the welding between the packaging materials at the first welding portion. An absorbent article package characterized by being less than 1/10 of the force separating the two. The absorbent article package according to any one of claims 1 to 8 ,
In the packaged state, having a thickness direction,
The packaging material has a tape member,
The tape member includes a peelable part that can be peeled off when unsealed, and a fixed part fixed to the packaging material,
The packaging material is folded multiple times,
In the thickness direction, a double portion in which two of the packaging materials are stacked and a triple portion in which three of the packaging materials are stacked are provided,
At the time of use, the side on which the first deployed part is located is the upper side,
A portion where the packaging materials of the end portion of the double portion are welded together is defined as a first weld portion,
If the parts of the triple part where the packaging materials are welded to each other at the ends are referred to as a second welded part and a third welded part in order from the upper side,
A force that separates the packaging materials from each other at the first welding portion, a force that separates the packaging materials from each other at the second welding portion, and a force that separates the packaging materials from each other at the third welding portion. The absorbent article packaging body, wherein the force is smaller than the force for peeling the peeling portion from the packaging material. The absorbent article package according to any one of claims 1 to 9 ,
In the packaged state, having a thickness direction,
The absorbent article has an adhesive area on the non-skin side,
The packaging material includes a protective sheet that protects the adhesive area,
The packaging material is folded multiple times,
In the thickness direction, a double portion in which two of the packaging materials are stacked and a triple portion in which three of the packaging materials are stacked are provided,
At the time of use, the side on which the first deployed part is located is the upper side,
A portion where the packaging materials of the end portion of the double portion are welded together is defined as a first weld portion,
If the parts of the triple part where the packaging materials are welded to each other at the ends are referred to as a second welded part and a third welded part in order from the upper side,
A force that separates the packaging materials from each other at the first welding portion, a force that separates the packaging materials from each other at the second welding portion, and a force that separates the packaging materials from each other at the third welding portion. An absorbent article package, wherein the forces are each greater than the force separating the absorbent article from the protective sheet. The absorbent article package according to any one of claims 1 to 10 ,
The end portion has a welded region where the packaging materials are welded together,
The force that separates the welding of the packaging materials at the outer end of the welding region in the folding line direction separates the welding of the packaging materials at the inner end of the welding region in the folding line direction. an absorbent article package characterized in that the force is greater than the force that causes the absorbent article.

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