JP3568146B2 - Method and apparatus for manufacturing absorbent article - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for producing an absorbent article such as a sanitary napkin, an incontinence pad, a diaper, and the like, comprising a liquid-permeable surface material and a liquid-impermeable backing material, and a liquid-retentive liquid-absorbing liquid interposed therebetween. And a manufacturing apparatus.
[0002]
[Prior art]
As a conventional absorbent article, as described in Japanese Utility Model Application Laid-Open No. 2-88625 and Japanese Patent Application Laid-Open No. 9-108262, a groove is formed in the central absorption region of the laminated portion of the surface material and the liquid absorbing material to prevent menstrual blood leakage. Those that can be prevented have been proposed. In general, the groove is formed by squeezing a pressing roll with a forming protrusion.
[0003]
[Problems to be solved by the invention]
However, the prior art has the following problems.
(1) Depending on the size, shape or material of the groove, the pressure of the groove becomes insufficient, the groove becomes shallow, or the surface material peels off from the liquid-absorbing material, and the leak prevention performance and the mountability deteriorate. was there.
[0004]
(2) In order to solve the problems of the groove depth and surface material floating described in (1) above, increasing the pressure and temperature of the pressure roll or increasing the height of the forming protrusion of the pressure roll In addition, a large shearing force is applied to the surface material, or the surface material is cut due to melting of the surface material, and the leak prevention performance and the mounting property may be reduced as in the above (1).
[0005]
An object of the present invention is to form a groove in a laminated portion of a surface material and a liquid-absorbing material in an absorbent article, and to have a stable menstrual leakage prevention performance and a good fit without causing cuts or floating of the surface material. Is to do.
[0006]
[Means for Solving the Problems]
According to the first aspect of the present invention, there is provided an absorbent material comprising a liquid-permeable surface material, a liquid-impermeable back material, and a liquid-retaining liquid absorbing material interposed between the surface material and the back material. In the method for manufacturing an absorbent article, the absorbent article has a groove formed of a side wall and a bottom in the surface material and the liquid absorbing material, and the groove is formed by forming the surface material and the liquid absorbing material with a forming protrusion of a pressure roll. be those that are formed by squeezing, it said shaped projection is taller than the surrounding in the projections, and the high compression portion forming the bottom of the groove, low form a step lower than the high compression portions The high-pressure part forms the bottom of the groove, and the low-pressure part forms the side wall of the groove.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
The method of manufacturing a sanitary napkin will be described as an embodiment of the present invention with reference to the drawings.
As shown in FIGS. 2 to 4, the sanitary napkin 10 includes a liquid-permeable surface material 11, a liquid-impermeable back material 13, and a liquid interposed between the surface material 11 and the back material 13. A substantially oval-shaped groove 14 is provided around the central absorption region in the laminated portion of the surface material 11 and the liquid-absorbing material 12, and the lateral leakage of menstrual blood can be prevented by the groove 14. . The groove 14 has a side wall 14a and a bottom 14b. In addition, a slip preventing agent 16 to be attached to underwear is provided on the center portion of the back material 13 and on the non-skin contact surface side of the left and right wings 15. In FIG. 3C, reference numeral 17 denotes a hot melt.
[0008]
The production process of the sanitary napkin 10 is performed as follows.
(1) The surface material 11 and the liquid absorbing material 12 are supplied to the groove forming device 20 of FIG. 1 in a stacked state (FIG. 3A).
[0009]
(2) The surface material 11 and the liquid absorbing material 12 are pressed and pressed by the pair of upper and lower pressure rolls 21 and 22 of the groove forming device 20. At this time, the surface material 11 and the liquid absorbing material 12 are squeezed by the forming protrusion 30 of the pressure roll 21 to form the groove 14 in the surface material 11 and the liquid absorbing material 12 (FIG. 3B).
[0010]
(3) Wrap both sides of the liquid absorbing material 12 at both sides of the surface material 11, and bond the back material 13 to both ends of the surface material 11 located on the back side of the liquid absorbing material 12 (FIG. 3C).
[0011]
However, as shown in FIG. 5 (A), the forming protrusion 30 of the pressure roll 21 constituting the groove forming device 20 has a rear portion A (a portion corresponding to the rear of the female local portion) of the groove 14 and a front portion B (a female local portion). Forming portions corresponding to the front equivalent portion) and the intermediate portion C are formed as molded projections 31, 32, and 33, respectively. FIG. 5B is a view of the forming protrusion 31 taken along the line AA in FIG. 5A.
[0012]
As shown in FIG. 5B, the forming protrusion 31 includes a low compression part 31A, a high compression part 31B, and a low compression part 31C in the width direction of the rear part A of the groove 14. That is, the forming protrusion 31 is configured such that a portion where the side wall portion 14 a of the groove 14 is formed on the leading side (the entrance side to the surface material 11) in the rotation direction of the pressure roll 21 is a low compression portion 31 </ b> A, and the bottom portion 14 b of the groove 14 is formed. The part to be formed is a high-pressure part 31B, the part that forms the side wall part 14a of the groove 14 on the side opposite to the rotational direction of the pressure roll 21 (outside to the surface material 11) is a low-part pressing part 31C, 31A and 31C make a low level | step difference with respect to the high pressure press part 31B. The length X of the low compression parts 31A, 31C is 0.5 to 10 mm, preferably 0.5 to 5 mm. R or C chamfers are applied to the corners of the low compression parts 31A and 31C. The low compression part 31C is not essential, and the outgoing molding surface of the high pressure part 31B may be a tapered surface as shown by a chain line in FIG.
[0013]
In addition, the shaping | projection protrusion part 31 arrange | positions the high pressure squeezed part 31B intermittently in the longitudinal continuation direction of the bottom part 14b of the groove 14, and arranges the high pressure squeezed part 31B and the low squeezed part 31D alternately in the longitudinal continuation direction, As a result, In the longitudinal continuation direction of the bottom 14b of the groove 14, high pressure squeezed bottoms and low squeezed bottoms are alternately arranged.
[0014]
Similarly to the forming protrusion 31, the forming protrusion 32 includes a low compressed portion 32A, a high pressed portion 32B, and a low compressed portion 32C in the width direction of the front portion B of the groove 14.
[0015]
Similarly to the molding protrusion 31, the molding protrusion 33 includes a low compression part 33A, a high compression part 33B, and a low compression part 33C in the width direction of the middle part C of the groove 14.
[0016]
In the molding projection 30, the low compression parts 31A and 31C of the molding projection 31, the low compression parts 32A and 32C of the molding projection 32, and the low compression parts 33A and 33C of the molding projection 33 have the same height as each other. The high-pressure squeezed portion 31B of the projection 31, the high-pressure squeezed portion 32B of the molding projection 32, and the high-pressure squeezed portion 33A of the molding projection 33 have the same height.
[0017]
Therefore, according to the present embodiment, the following operations are provided.
{Circle around (1)} On the advancing side and / or the advancing side of the forming protrusion 30 of the pressure roll 21 in the roll rotation direction, the portion for forming the side wall portion 14a of the groove 14 is formed by the low pressing portions 31A, 32A, 33A, 31C, Since it is 32C and 33C, the pressing depth of the surface material 11 and the liquid absorbing portion 12 at the start of pressing by the low pressing portions 31A, 32A, 33A, 31C, 32C, and 33C of the forming protrusion 30 becomes gentle. . Therefore, the shearing force acting on the surface material 11 in this portion is small, and the occurrence of cutting of the surface material 11 can be prevented.
[0018]
{Circle around (2)} The portion for forming the bottom portion 14b of the groove 14 in the forming protrusion 30 of the pressure roll 21 includes a high-pressure pressed portion 31B which forms a step with respect to the low-pressed portions 31A, 32A, 33A, 31C, 32C, and 33C. 32B and 33B. The high pressure portions 31B, 32B, 33B can form the groove 14 having a depth necessary and sufficient for preventing lateral leakage of menstrual blood. At the same time, the high-pressure pressing parts 31B, 32B, and 33B give the surface material 11 and the liquid-absorbing material 12 a necessary and sufficient pressure-bonding amount, and securely press the component material of the surface material 11 in this portion to the component material of the liquid-absorbing material 12. (Such as entanglement of fibers), and it is possible to prevent the surface material 11 from peeling off from the liquid absorbing material 12.
[0019]
{Circle around (3)} Both sides in the width direction of the groove 14 serve as low-pressure side walls, so that menstrual blood can be absorbed well, so that the ability to prevent menstrual blood from leaking laterally can be improved.
[0020]
{Circle around (4)} Both sides in the width direction of the groove 14 are low-press side walls, and the edge of the groove 14 is gentle, does not irritate the female local part, and has good wearability.
[0021]
In the practice of the present invention, the surface material of the absorbent article is, for example, a nonwoven fabric or a perforated resin film, the liquid absorbing material is pulp or a water-absorbing polymer, and the backing material is a resin film or a composite sheet of a nonwoven fabric and a resin film. Can be adopted without limitation.
[0022]
Further, in the practice of the present invention, the low-pressing portion provided on the leading side and / or the non-leading side in the roll rotation direction from the high-pressing portion that forms the bottom of the groove in the forming protrusion of the pressure roll has one step. Instead, a plurality of steps may be formed.
[0023]
Further, in the practice of the present invention, the low compression portion preferably exists on the leading side in the rotation direction, and more preferably exists on the entire circumference. In order to obtain a stable groove shape, low compression is used, especially when the groove continuous direction in which the contact area between the roll forming protrusion and the absorbent article is large and the rotation axis of the pressure roll are parallel or nearly parallel. Preferably, the part is present on the leading side in the direction of rotation.
[0024]
In the practice of the present invention, the temperature of the pressure roll is preferably from 50 to 250 ° C., more preferably from 60 to 200 ° C., from the viewpoint of the influence on the groove forming appearance due to seal debris and burrs, and the high-speed productivity. .
[0025]
【The invention's effect】
As described above, according to the present invention, in forming a groove in a laminated portion of a surface material and a liquid-absorbing material in an absorbent article, the surface material can be stably prevented from leaking or floating without causing breakage or floating of the surface material. Properties can be improved.
[Brief description of the drawings]
FIG. 1 is a schematic view showing an example of a groove forming apparatus.
FIG. 2 is a schematic diagram showing an example of a sanitary napkin.
FIG. 3 is a schematic diagram showing a sanitary napkin production process in a cross section of the sanitary napkin.
FIG. 4 is a sectional view taken along the line IV-IV in FIG. 2;
FIG. 5 is a schematic view showing a forming protrusion of a pressure roll.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Sanitary napkin 11 Surface material 12 Liquid absorption 13 Back material 14 Groove 20 Groove forming device 21, 22 Pressure roll 30, 31, 32 Forming projection 31A, 31C, 32A, 32C Low compression part 31B, 32B High pressure part

Claims (5)

A method for producing an absorbent article comprising a liquid-permeable surface material, a liquid-impermeable backing material, and a liquid-retaining liquid-absorbing liquid interposed between the surface material and the backing material,
The absorbent article has a groove formed of a side wall and a bottom in the surface material and the liquid absorbent,
The groove is formed by squeezing the surface material and the liquid absorption with a forming protrusion of a pressure roll,
The molding projection is higher in height than the periphery in the projection, and includes a high-pressure pressed part forming the bottom of the groove, and a low-pressed part forming a step lower than the high-pressure pressed part,
A method of manufacturing an absorbent article, wherein a bottom portion of a groove is formed by the high pressure portion and a side wall portion of the groove is formed by the low pressure portion. The method for manufacturing an absorbent article according to claim 1, wherein the forming protrusions of the pressure roll are provided in the order of a low pressure part and a high pressure part with respect to the roll rotation direction. A liquid-permeable surface material, a liquid-impermeable backing material, and a device for manufacturing an absorbent article comprising a liquid-retaining liquid-absorbing liquid interposed between the surface material and the backing material,
The absorbent article has a groove formed of a side wall and a bottom in the surface material and the liquid absorbent,
The groove is formed by squeezing the surface material and the liquid absorption with a forming protrusion of a pressure roll,
The forming protrusion of the pressure roll has a portion for forming the side wall of the groove on the leading side in the roll rotation direction, and a high-pressure pressing portion for forming the bottom of the groove having a height higher than the periphery in the protrusion. An absorptive article manufacturing apparatus, characterized in that the apparatus has a low compression portion having a low step. The forming protruding portion of the pressure roll has a portion that forms the side wall portion of the groove on the side opposite to the roll rotation direction, and has a low pressing portion that forms a step with respect to the high pressure pressing portion that forms the bottom of the groove. The apparatus for producing an absorbent article according to claim 3, wherein The forming protrusion of the pressure roll has a portion for forming the side wall of the groove as a low-pressing portion forming a step with respect to the high-pressure pressing portion over the entire periphery of the high-pressure pressing portion for forming the bottom of the groove. The apparatus for producing an absorbent article according to claim 3, wherein

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