AU716286B2 - Environmentally friendly catamenial tampon assembly and method of construction - Google Patents

Description

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AUSTRALIA

PATENTS ACT 1990 COMPLETE SPECIFICATION FOR A STANDARD PATENT

ORIGINAL

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r r c r Name of Applicant: Actual Inventors: McNEIL-PPC,

INC.

John ORENGA and Edwin H. SAILER *Scv 9* S S Address of Service: Invention Title: BALDWIN SHELSTON WATERS MARGARET STREET SYDNEY NSW 2000 "ENVIRONMENTALLY FRIENDLY CATAMENIAL TAMPON ASSEMBLY AND METHOD OF CONSTRUCTION" Details of Original Application No. 37992/95 dated 21st November 1995 The following statement is a full description of this invention, including the best method of performing it known to us:- -2- ENVIRONMENTALLY FRIENDLY CATAMENIAL TAMPON ASSEMBLY AND METHOD OF CONSTRUCTION BACKGROUND OF THE INVENTION This application is a further application in respect of an invention disclosed in our copending application AU 52604/93 and claimed in original claims 1 to 59 thereof. The entire disclosure in the specification and claims of AU 52604/93 is by this crossreference incorporated into the present specification.

Field of the Invention S 10 This invention relates to the field of tampon applicators for positioning catamenial tampons. More specifically, this invention relates to an improved environmentallyfriendly tampon applicator which is collapsible, biodegradable and flushable.

Description of the Prior Art In the past, catamenial tampons have been applied and used either with or without applicators. Digital tampons are inserted into the vaginal cavity manually. Applicators, however, have been used in order to facilitate the insertion of the tampon and for the purposes of comfort and discretion. Generally, tampon applicators are composed of two separate concentric plastic or cardboard tubes which are in telescopic relationship to one another. The tube having a larger diameter cross-section is termed the outer sleeve, which generally retains the tampon plug, or pledget. The tube having a smaller diameter is termed the inner sleeve and is usually positioned within the outer sleeve behind the pledget. The inner sleeve is used to expel the pledget from the applicator during use.

For reasons relating to convenience and discretion, it is desirable that the tampon applicator be as small as possible. To that end, applicator designs have been introduced which provide for the inner and outer sleeves to be nested prior to use. Such designs are disclosed in US Patent Nos. 4,286,595 and 4,479,791. In such designs, the pledget is held in place with respect to the outer sleeve by a retaining element or tang when the inner sleeve is retracted. The inner sleeve is designed to engage a rear portion of the pledget once it has been retracted. After the inner sleeve has been retracted, then, the tampon may be expelled from the outer sleeve into the vaginal cavity by pushing with the inner sleeve.

The above-discussed tampon applicator designs have proved themselves to be effective and convenient. However, such applicators commonly are fabricated in part or in whole from plastics, which are not biodegradable or flushable.

It is clear that there has existed a long and unfilled need in the prior art for a tampon applicator which is collapsible, biodegradable and flushable.

It is an object of the invention to ameliorate at least some of the disadvantages of the prior art.

15 SUMMARY OF THE INVENTION tapo "According to a first aspect the invention provides an environmentally friendly tampon assembly, comprising: a pledget of absorbent material; an inner sleeve for containing said pledget, said inner sleeve being fabricated from a biodegradable material and having pushing means at a forward end thereof for pushing said pledget; and a substantially tubular outer sleeve for slidably containing said inner sleeve, *oooo said outer sleeve comprising biodegradable material, said outer sleeve having a longitudinal direction and a tang comprising an inwardly-projecting folded tang-forming portion of said outer sleeve, said tang-forming portion having first and second ends made substantially adjacent by collapsing a portion of the outer sleeve in a longitudinal direction to form a finger grip.

21121-00.DOC -4- For a better understanding of the invention, its advantages, and the objects obtained by its use, reference should be made to the drawings which form a part hereof, and to the accompanying descriptive matter, in which there is illustrated and described a preferred embodiment of the invention.

*9 a 9 9* oo o/ 21121-00.DOC Unless the context clearly requires otherwise, throughout the description and the claims, the words 'comprise', 'comprising', and the like are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense; that is to say, in the sense of "including, but not limited to".

BRIEF DESCRIPTION OF THE DRAWINGS FIGURES 1A-IC depict the fabrication of an inner sleeve for an improved tampon applicator according to a preferred embodiment of the invention; FIGURES 2A-2E depict fabrication of an outer sleeve for the tampon assembly according to a first, preferred embodiment of the invention; FIGURES 3A-3C depict operation of the tampon assembly utilizing the inner and outer sleeves depicted in FIGURES 1A-1C and 2A-2E, respectively.

FIGURES 4A-4F depict formation of an outer sleeve according to a second, preferred embodiment of the invention; 5 is FIGURES 5A-5B depict fabrication of an outer sleeve for a tampon applicator according to a third, preferred embodiment of the invention; FIGURES 6A-6C depict fabrication of an outer sleeve for a tampon applicator e• "according to a fourth preferred embodiment of the invention;

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6 FIGURES 7A-7D depict fabrication of an outer sleeve for a tampon applicator according to a fifth preferred embodiment of the invention; and FIGURES 8A-8C depict fabrication of an outer sleeve for a tampon applicator according to a sixth preferred embodiment of the invention.

DETAILED DESCRIPTION OF THE PREFERRED

EMBODIMENT(S)

Referring now to the drawings, wherein like reference numerals designate corresponding structure throughout the views, and referring in particular to FIGS.

1A-1C, 2A-2E and 3A-3C, an improved collapsible, biodegradable and flushable tampon assembly 12 includes an inner sleeve 10, an outer sleeve 14 and a pledget assembly including an absorbent pledget 52 and a string 54, as may 15 thus be seen in FIGURES 3A-3C.

Preferably, both inner sleeve 10 and outer sleeve 14 are fabricated from a biodegradable, flushable material, preferably paper. Most preferably, a multilayered paper material, either virgin or recycled, is used in conjunction 20 with a water-based adhesive. The outer layer of material is most preferably coated with a smooth biodegradable material to enhance insertion comfort. Such coating materials may be polyvinyl alcohol, PHBV such as is available under the Biopol brand from ICI, Ltd., starch such as is available under the 25 Novon brand from Warner-Lambert, destructured starch as is available from Novamont under the brand name Mater Bi, polyethylene glycol, or a natural coating such as beeswax.

Referring now to FIGURE 1C, inner sleeve 10 is formed from a tube 16 having a first end 18 and a second end 20. A ring 22 is formed on the second end 20 of tube 16 to provide a gripping surface for a user, as will be described in greater detail below. A plurality of petals 24 are defined on the first end 18 of tube 16. Petals 24 are bent inwardly toward a central axis of tube 18, as may best be seen in FIGURES 1C and 3A. The petals 24 include a number of longer petals 28, and at least one shorter petal 26, as is shown in FIGURE 1C. The purpose of shorter petal 26 and 7 longer petals 28 will be described in geater detail below.

FIGURES 1A-1C depict a method of forming an inner sleeve 10 according to a preferred embodiment of the invention. Referring first to FIGURE 1A, a cylindrical tube 16 which is fabricated from a biodegradable, flushable material is first provided.

Tube 16 has a first end 18 and a second end 20, as shown in FIGURE 1A. As may be seen in FIGURE 1B, gripping ring 22 is formed by rolling up a portion of the second end 20 of tube 16 and compressing the rolled up portion. Referring now to FIGURE 1C, the petals 24 are then die-cut into the first end 18 of tube 16 so as to form the shorter petal 26 and the longer petals 28. A longitudinal slot is then cut into a side wall of tube 16.

The edges 30 which define the longitudinal slot are illustrated in FIGURE 1C. The purpose of longitudinal slot 30 will be described below in the description of operation of tampon assembly which is provided in relation to FIGURES 3A-3C.

Referring briefly to FIGURE 2E, a preferred embodiment of outer sleeve 14 includes a tube 32 which is formed from a biodegradable, flushable material. Outer 15 sleeve 14 further includes a plurality of petals 36 defined in a first, upper end of tube 32, and a handle portion 50 defined in a second, lower portion of tube 32. Outer sleeve 14 further includes an inwardly extending tang 48 which is formed from a tang-forming portion of the outer sleeve tube. The tang 48 projects inwardly from tang ends 49a and 49b of tube 32 toward a center axis 34 of tube 32.

A preferred method for forming the outer sleeve 14 is illustrated in FIGURES 2A- 2E. As may be seen in FIGURE 2A, a tube 32 of biodegradable, flushable material is provided which has a center axis 34. As may be seen in FIGURE 2B, petals 36 are first 8 die-cut into a first, upper end of tube 32. At about the same time, first and second longitudinal slits 38, 40 are made in an outer wall of tube 32. Slits 38,40 are made through the entire thickness of the outer wall of tube 32, and are preferably parallel to each other and to the center axis 34 of tube 32. After first and second slits 38, 40 have been made, a plurality of circumferential scores 42 are made in the outer wall of tube 32 at regular spaced intervals from the top of slits 38 40 to the second lower end of tube 32. Circumferential scores 42 do not extend through the entire thickness of outer wall of tube 32 but are made in order to facilitate folding of the material from which tube 32 is made at the location of the scores 42. Circumferential scores 40 further do not extend in 10 the area between slits 38,40. Referring now to FIGURE 2D, the tube 32 depicted in FIGURE 2C is placed in a forming die assembly including a stationary support die 44 and a moving crimp die 46. As is shown in FIGURE 2D, lower crimp die 46 is moved a towards stationary die 44 for a predetermined distance, which causes the outer wall of Stube 32 to collapse along the circumferential score lines 44. Simultaneously, the area defined between first and second slits 38, 40 folds inwardly along a crease which coincides with the score line formed therein to form the inwardly extending tang 48 shown in FIGURE 2E. As may be seen in FIGURE 2E, the collapsed lower portion of the tube 32 forms the handle portion 50, which is densified and smoothed to become a rigid finger grip zone.

Referring now to FIGURE 3A-3C, it will be seen that tampon assembly 12 is formed by inserting the absorbent pledget 52 into the inner sleeve 10 from the second end 20 to the first end 18 of inner sleeve 10. Pledget 52 is thus nested within and 9 partially enclosed by the petals 24 at the first end 18 of inner sleeve 10. Inner sleeve and pledget 52 are then inserted into the outer sleeve 14 in such a manner that the tang 48 of outer sleeve 14 extends through the slot 30 that is defined in the outer wall of the tube 16 of inner sleeve 10. After such assembly, tang 48 is positioned beneath pledget 52 so as to engage a bottom surface 53 of pledget 52.

In order to use tampon assembly 12, a consumer first grips the second lower end 20 of inner sleeve 10 by gripping ring 22 and retracts inner sleeve 10 from outer sleeve 14 in the manner that is depicted in FIGURE 3B. As *a /owt 10 this occurs, pledget 52 will be retained in place relative to outer sleeve 14 by the force exerted by tang 48 against the bottom surface 53 of pledget 52. As inner sleeve 10 is retracted, petals 24 will be spread outwardly by pledget 52 and will be drawn downwardly around pledget 52 until reaching the bottom surface 53 of pledget 52. At this. point, depicted in FIGURE 3B, the shorter petal 26 will spring inwardly again to a position which is beneath the bottom surface 53 of pledget 52. At this point of retraction, the consumer will then begin to reinsert inner sleeve 10 into outer sleeve 14.

The pressure which is exerted by shorter petal 26 against the bottom surface 53 of pledget 52 will cause the pledget 52 to ee.. be forced upwardly by the motion of inner sleeve 10 as it is reinserted into outer sleeve 14. This will force the pledget 52 through the petals 36 of outer sleeve 14 so that the pledget 52 may be safely and efficiently inserted into the vaginal cavity.

FIGURES 4A-4F depict a method for forming an outer sleeve 56 according to a second preferred embodiment of the invention. Referring first to FIGURE 4A, a tube blank 58 is provided which includes a rectangular portion having a plurality of petals 60 formed on an upper end thereof, and a projection 62 extending outwardly from a lower end of the rectangular portion. Projection 62 is also substantially rectangular, although it has a recess 66 defined in an upper end thereof, and a square recess defined in a lower end thereof which defines an anchor tab 64. A plurality of vertical score lines 68 are defined at regularly spaced intervals on projection 62. Score lines 68 do not extend through the entire thickness of projection 62. Referring to FIGURE 4B, projection 62 is first folded at the point of score lines 68 so as to create a series of alternating ridges in projection 62. Projection 62 is then folded upwardly so as to be substantially perpendicular to the remainder of tube blank 58, as shown in FIGURE 4C. Anchor tab 64 is then affixed to remainder tube blank 58 by an adhesive, as is shown in FIGURE 4D. After anchor tab 64 has been so secured,

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the rest of projection 62 remains as a portion 70 which fans out from the surface of tube blank 58, as may be seen in FIGURE 4D. Tube blank 58 is then rolled so that the rectangular portion thereof is formed into a tube, as shown in FIGURE 4E. At about the same time, petals 60 are pressed so as to bend inwardly toward the central axis of the so formed outer sleeve 56. The fanned-out portion 70 of projection 62 thus becomes an inwardly extending tang 72, as may be seen in FIGURES 4E and 4F.

Referring now to FIGURES 5A-5B, a tube blank 74 for forming an outer sleeve according to a third preferred embodiment of the invention, will now be described. As oe o may be seen in FIGURE 5A, tube blank 74 is substantially rectangular in shape and S. 10 includes a plurality of petals 76 which are formed at a top end thereof. Tube blank 74 is cut at a central portion thereof so as to define a central space 78 and a tang forming portion 80. Tang forming portion 80 is defined by a pair of slits 84, 86 which extend through the entire thickness of tube blank 74, and a pair of scores 88, 90 which, respectively, are aligned and positioned beneath slits 84, 86. Cut out portions 91, 93 are provided at the lower end of tub blank 74 for purposes that will be apparent when Sviewing FIGURE 5B. To form an outer sleeve from tube blank 74, tube blank 74 is folded along score lines 88, 90 so as to position a tab portion 82 defined on one side of space 78 over the edge 79 which defines the opposite side of space 78. Tab portion 82 can then be sealed to edge 79 to form a longitudinal seam 83. In the process, the tang forming portion 80 folds at scores 95, 97 so as to raise a square profiled tang 92 from the surface of tube blank 74. Simultaneously, the portion 99 of tang forming portion which is between cut out portions 91 will form a surface 94 of tang 92 which is flush with the surface of the tube blank 74 after folding. Tube blank 74 may then be kept in its 12folded position through use of adhesives, and may then be folded into an outer sleeve 101, as depicted in FIGURE Referring now to FIGURES 6A-6C, a method for forming an outer sleeve according to a fourth embodiment of the invention utilizes a tang blank 96 which is positioned between first and second forming dies 98, 100. Dies 98, 100 are forced together in order to form a tang insert 102, as is best shown in FIGURE 6B. Tang insert 102 includes a pair of flat surfaces 103 on which an adhesive 1.05 is placed. According to the preferred embodiment of the method, tang insert 102 is kept in second die 100 after the application of adhesive 105 to surfaces 103. Second die 100 is then moved relative a rectangular tube blank 104 having petals 107 defined therein. Second die 100 is then pressed against tube blank 104 to cause the tang insert 102 to become adhered to an inside surface of tube blank 104. Tube blank 104 is then rolled into a tube to complete the fabrication of an outer sleeve according to the fourth embodiment of the a..

invention.

A method for fabricating an outer sleeve according to a fifth embodiment of the S-.I invention is depicted in 7A-7D. As may be seen in FIGURE 7A, a tube blank 106 includes a plurality of petals 108 formed on a rectangular portion thereof, and projection 110 which extends from a lower end of the rectangular portion. Projection 110 is shaped so as to define an anchor tab 118 on a lower end thereof. According to this embodiment of the invention, projection 110 is rolled up into a rolled projection 112, as may be seen in FIGURE 7B. Anchor tab 118 is then adhered to the surface of tube blank 106, as may be seen in FIGURE 7C. This process causes the remainder of rolled up projection 112 to project outwardly as a tang 114. Tube blank 106 is then formed into a tube to form an -13outer sleeve 116 having a longitudinal seam 119 according to the fifth embodiment of the invention, as shown in FIGURE 7D.

A method of forming an outer sleeve according to sixth embodiment of the invention is depicted in FIGURES 8A-8C. According to this embodiment of the invention, a tube blank 122 is substantially rectangular in shape, and includes a plurality of petals 124 on an upper end thereof. Tube blank 122 includes a space 126 defined in a central area thereof along with a tang forming portion 128. As may be seen FIGURE 8B, the portions of tube blank 122 on each side of space 126 may be pulled together so as to form a longitudinal seam 127 and to form the tang forming portion of 128 into an 10 internal roll of tube. After rolling, a roller portion 129 of tang forming portion 128 is 9o0.

secured to the tube blank 122 with an adhesive or other suitable means to form tang 130, as may best be seen in FIGURE 8C. Tube blank 122 is then rolled into a tube to form an outer sleeve to form an outer sleeve according to the sixth embodiment of the invention.

It is to be understood, however, that even though numerous characteristics and advantages of the present invention have been set forth in the foregoing description, together with details of the structure and function of the invention, the disclosure is illustrative only, and changes may be made in detail, especially in matters of shape, size and arrangement of parts within the principles of the invention to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed.

Claims (9)

1. An environmentally friendly tampon assembly, comprising: a pledget of absorbent material; an inner sleeve for containing said pledget, said inner sleeve being fabricated from a biodegradable material and having pushing means at a forward end thereof for pushing said pledget; and a substantially tubular outer sleeve for slidably containing said inner sleeve, said outer sleeve comprising biodegradable material, said outer sleeve having a longitudinal direction and a tang comprising an inwardly-projecting folded tang-forming portion of said outer sleeve, said tang-forming portion having first and second ends made substantially adjacent by collapsing a portion of the outer sleeve in a longitudinal direction to form a finger grip.

2. A tampon assembly according to claim 1, wherein said inner and outer sleeves are both fabricated from a material which is both biodegradable and flushable.

3. A tampon assembly according to claim 1, wherein said inner and outer sleeves are both fabricated from a material comprising paper.

4. A tampon assembly according to claim 1, wherein said outer sleeve is folded along at least one fold line to form said retaining tang.

5. A tampon assembly according to claim 4, wherein said outer sleeve is prescored at said fold line.

6. A tampon assembly according to claim 1, wherein said outer sleeve has two slits .formed therein, said tang being formed from material between said two slits.

A tampon assembly according to claim 6, wherein said outer sleeve is 25 compressed in a direction in which said slits extend, and the material defined between the slits is folded to form said tang.

8. A tampon assembly according to claim 1, wherein said tube portion has a slot defined therein for receiving a projecting tang of an outer sleeve of the tampon assembly.

9. A tampon assembly according to claim 1, wherein said tube has a flange at a second end which is opposite said first end on which said petals are provided. 21 121-00o.DOC An environmentally friendly tampon assembly as claimed in claim 1 and substantially as herein described with reference to figurers 5A, 5B, 7D, 8B or 8C. DATED this 3rd Day of December 1999 MCNEIL-PPC, INC Attorney: PAUL G. HARRISON Fellow Institute of Patent Attorneys of Australia of BALDWIN SHELSTON WATERS