Toilet paper dispenser housing a roll, toilet paper roll and dispenser

Abstract

The toilet paper dispenser as claimed for the invention including a housing in which is housed a roll of a paper strip, which has perforations transverse to strip defining rectangular paper sheets whose width is transverse and whose length is longitudinal. Housing features a nozzle with a dispensing orifice, by means of which the paper strip is unwound. The dispenser is characterized in that the nozzle and the paper roll are disposed in such a way that the paper sheets unwind one by one and emerge with a reduced crumpling as they exit the nozzle, the width of a sheet is between 125 mm and 180 mm, and the ratio of the width of a sheet to its length is between 0.45 and 1, preferably between 0.5 and 0.65, the paper being consumed optimally and in a pleasant manner.

Claims

1. A toilet paper dispenser comprising: a housing adapted to house a center-feed roll of a toilet paper strip; and a nozzle comprising a wall forming an interior hollow portion through which the toilet paper strip is unwound, wherein the wall of the nozzle extends externally from a housing end, located where the nozzle and housing join, to an external end forming a circular dispensing orifice external to the housing, wherein a diameter of the circular dispensing orifice is between 6 mm and 8 mm, and wherein the circular dispensing orifice forming portion of the wall is configured to create friction on the toilet paper strip such that when the roll of toilet paper strip: is installed in the dispenser; has paper sheets each having a ratio of the width to the length of the sheets between 0.45 and 1; has perforations transverse to a longitudinal length of the strip; has a ratio of precuts of the perforations between 12% and 30%; and has two plies, wherein each ply of the paper sheets has a grammage between 15 g/m.sup.2 and 20 g/m.sup.2; a ratio of force of extraction of the toilet paper strip outside the nozzle to force of tear perforation teeth holding together two adjacent sheets of the toilet paper strip is greater than 1 so as to unwind and separate the paper sheets from the toilet paper strip one by one.

2. The toilet paper dispenser according to 1, the ratio of the width to the length is between 0.5 and 0.65.

3. The toilet paper dispenser according to 1, wherein the ratio of force of extraction of the toilet paper strip outside the nozzle to force of tear perforation teeth holding together two adjacent sheets of the toilet paper strip is between 1.1 and 2.

4. The toilet paper dispenser according to 1, wherein the toilet paper strip is tissue paper.

5. The toilet paper dispenser according to 1, wherein the width of the paper sheets is between 125 mm and 180 mm.

6. The toilet paper dispenser according to 5, wherein an axis of the nozzle dispensing orifice is disposed perpendicular to an axis of the roll of the toilet paper strip.

7. The toilet paper dispenser according to 1, wherein the hollow portion has a truncated shape in which the hollow portion has a larger diameter at the housing end of the nozzle than a diameter at the circular dispensing orifice located at the external end.

8. The toilet paper dispenser according to 1, wherein a length of the interior surface hollow portion of the nozzle from the housing end to the external end is larger than the diameter of the circular dispensing orifice.

9. The toilet paper dispenser according to 1, wherein the nozzle comprises a hollow truncated shape and, a length of the nozzle from the housing end to the external end is larger than the diameter of the circular dispensing orifice.

10. The toilet paper dispenser according to 1, wherein an entire circumference of the circular dispensing orifice is at an outermost surface of the toilet paper dispenser.

Description

(1) This invention will be better understood by means of the following description of the preferred embodiment of the dispenser as claimed for the invention, by reference to the attached drawing, in which:

(2) FIG. 1 represents a perspective view of the dispenser as claimed for the invention with a sheet in the process of being unwound; and

(3) FIG. 2 represents a perspective view of the paper roll as claimed for the invention.

(4) By reference to FIG. 1, dispenser 1 as claimed for the invention is a toilet paper dispenser. The toilet paper herein is tissue paper, comprising two plies or layers bonded to each other by any appropriate mechanical or chemical means, for example by knurling or gluing, in a manner well known to any person skilled in the art. By reference to FIG. 2, the toilet paper presents itself in the form of a strip 2 which is wound into a roll 3, which roll 3 does not include a tubular core, the paper being initially wound in such a way that one end 12 of the strip projects from the central part of roll 3 before it can be unwound therefrom. Strip 2 has perforations 4, transverse to the unwinding direction of strip 2, thus defining paper sheets 5 that can be detached individually. These paper sheets 5 are rectangular; they are defined by a transverse width “w” and a longitudinal length “L”.

(5) In the continuation of the description, by “transverse” or “longitudinal”, reference is always made to “transverse” and “longitudinal” in relation to strip 2, in its unwinding direction.

(6) Dispenser 1 includes a housing 6, cylindrical in shape, for receiving roll 3, which is also cylindrical in shape. Housing 6 is laid out in such a way so that roll 3 does not turn on its axis during unwinding. When roll 3 is inside housing 6, their axes are, as known, coexistent, if the cylinders are identical or at least parallel. Housing 6 includes means, not shown, for mounting it onto a support, in this case a wall 7 of the room in which one wishes to install dispenser 1, which mounting means are disposed in such a way that once the dispenser is hung, the axes of housing 6 and of roll 3 are perpendicular to wall 7. Housing 6 herein includes, on its side opposite wall 7, a transparent portion 8, which makes it possible to see, by transparency, roll 3 and strip 2 inside housing 6.

(7) Housing 6 features, on its periphery, at an edge of its side opposite the wall, a dispensing nozzle 9. This nozzle 9 has here a truncated shape, its smaller-diameter orifice being the exit orifice, or dispensing orifice 10, located on the external side of nozzle 9 in relation to housing 6.

(8) The general operation of dispenser 1 as claimed for the invention will now be explained. The free end 12 of the toilet paper strip, starting at the center of roll 3, is inserted into nozzle 9 in such a way as to project from the nozzle through its dispensing orifice 10. Because nozzle 9 herein is located at the periphery of housing 6, with its axis perpendicular to the axes of housing 6 and roll 3, there is a change of angle of strip 2 between the axis of roll 3 and the axis of nozzle 9. This change of angle is achieved naturally, without the adding of another structural component. Nevertheless, an angle modification fitting, such as a pulley or axle, could be provided.

(9) When a user pulls on end 12 of the paper strip projecting from nozzle 9, strip 2 unwinds from its center. The diameter of the dispensing orifice 10 of nozzle 9 and sheets 5 are disposed, as set forth hereinafter with their sizes, in such a way that the dispensing occurs sheet by sheet. To this end, the force of extraction of the paper out of nozzle 9, which force depends in particular on the friction of toilet paper strip 2 onto the wall of the dispensing orifice 10 of nozzle 9, must be greater than the force of the tearing of the perforation teeth that hold together two adjacent sheets 5 of strip 2, which depends in particular on the strength of the toilet paper and on the perforation rate of precuts 4, which is equal to the ratio of the sum of the transverse dimensions of the sheet perforation teeth to the width of strip 2. Thus, as the user unwinds strip 2, when the next perforation 4 comes out of nozzle 9, due to the above-described force ratio, sheet 5 being pulled by the user separates from the next sheet before this latter sheet fully exits nozzle 9. Thus we truly have a sheet-by-sheet delivery. The next sheet then projects from nozzle 9 and can in turn be unwound.

(10) This ratio of the extraction force to the tearing force must in particular be sufficient to offset the angle variations between the perforations 4 and the axis of the dispensing orifice 10 of nozzle 9, which angle impacts on the tearing of the paper, and which variations are related to the fact that the paper does not always present itself at the same angle, in particular depending on the amount of paper that has already been unwound.

(11) Seeking to obtain with certainty this sheet-by-sheet delivery, while ensuring that the unwound sheet 5 uncrumples by itself while exiting nozzle 9, this patent applicant discovered that it was possible to propose a new format for sheets 5, in such a way that the ratio “w/L” of their width (w) to their length (L) is between 0.45 and 1, for sheets whose width is between 125 mm and 180 mm.

(12) In particular, by contrast with the prior art, this patent applicant had wished to increase the width “w” of sheets 5 as well as the diameter of the dispensing orifice 10 of nozzle 9, in order to facilitate the unfolding of sheets 5 as they exit nozzle 9. The applicant had also considered that sheets 5 must retain a surface area equivalent to that of the sheets in the prior art, in order not to trigger any overconsumption of paper while still ensuring the drying function of sheets 5. In general, in the dispensers installed in public places, the sheets under the prior art are 98 mm wide and 350 mm long, thus presenting a surface area of 34300 mm.sup.2. The applicant thus modified the proportions between width “w” and length “L” of the sheets, while retaining an equivalent (plus or minus 1 percent) sheet surface, which remains to be defined by the manufacturer of dispenser 1.

(13) The applicant has conducted a series of tests, including in particular tests for computation of the percentage of success of sheet-by-sheet unwinding, tests on user behavior, all such tests being well known to any person skilled in the art. The applicant derived from said tests a range of preferred parameters, in addition to the w/L ratio, which parameters make it possible to even better fulfill the whole set of objectives of the invention, namely sheet-by-sheet unwinding of the paper, uncrumpling of the sheets as they exit the nozzle, and reduced paper consumption compared with the dispensers under the prior art. These additional preferred parameters are presented below.

(14) The Table below presents some of the data from a series of tests that were performed, both on a roll under the prior art, and on a series of rolls 3 as claimed for the invention, which rolls 3 have sheets with a “w/L” ratio between 0.45 and 1. The tests were conducted with two-ply, 16 g/m.sup.2 grammage paper for each ply, with a nozzle 9 whose dispensing orifice 10 has a 7 mm diameter.

(15) TABLE-US-00001 Prior art Invention Width w (mm) 98 130 136 140 145 150 155 180 Length L (mm) 350 264 254 245 235 228 221 190 Ratio w/L 0.28 0.49 0.54 0.57 0.62 0.66 0.70 0.95 Surface w*L (mm.sup.2) 34300 34320 34544 34300 34075 34200 34255 34200 Roll length (m) 200 200 200 200 200 200 200 200 Number of roll sheets 571 758 787 816 851 877 905 1053 Average number of 6 5 5 5 5 5 5 5 sheets per user Number of users per 95 152 157 163 170 175 181 210 sheet Increase in autonomy 59.09% 65.35% 71.43% 78.72% 84.21% 90.05% 121.68%

(16) Another advantage of the invention appears upon reading the above Table: due to the increased width of strip 2, for approximately the same unit surface area of sheet 5, the length “L” of sheets 5 must be decreased. Thus, for a roll of equal length (by length of roll 3, the length of strip 2 comprising said roll is meant), herein for example equal to 200 m, the number of sheets 5 of roll 3 is increased, and consequently so is the autonomy of dispenser 1. This makes it possible to decrease the number of maintenance personnel interventions for filling the empty dispensers and thus realize savings.

(17) In addition, the applicant finds that with the new format for sheets 5, the users use less sheets 5 (see “average number of sheets per user” in the above Table), hence a lesser sheet surface. The per-user toilet paper consumption is thus decreased and the autonomy of dispenser 1 conversely increased.

(18) The embodiment in FIG. 1, with the axis of housing 6 and roll 3 both perpendicular to wall 7, in conjunction with the sizing of the toilet paper as claimed for the invention, is advantageous because the overall size is decreased in the direction perpendicular to washroom wall 7. Indeed, this overall size is here directly dependent on the paper sheet 5 width “w” which is, as will be seen, set between 125 and 180 mm. This overall size is acceptable in a washroom and is thus bounded. It is thus possible to increase to one's liking the diameter of housing 6 so that it can accommodate a roll 3 with a larger diameter, that is to say, comprising a larger number of sheets 5. This increase in the number of sheets 5 only affects the directions parallel to the washroom wall 7, in the geometric planes bounded by the toilet paper width which is between 125 and 180 mm. Thus we can, without any cumbersome increase in the overall size, increase yet again the autonomy of dispenser 1.

(19) Further to these various tests and other tests, as well as upon taking into account numerous parameters such as overall size, ease of paper extraction while ensuring its sheet-by-sheet dispensing, etc., the applicant defined the following parameter ranges (with the additional preferred parameters set forth hereinabove), for an optimal operation of dispenser 1 as claimed for the invention:

(20) toilet paper comprising one or several plies, preferably comprising two plies, in tissue paper, each ply having a grammage between 14 and 30 g/m.sup.2, preferably between 15 and 20 g/m.sup.2;

(21) width “w” between 125 and 180 mm, preferably between 135 and 150 mm;

(22) ratio “w/L” between 0.45 and 1, preferably between 0.5 and 0.65;

(23) diameter of the dispensing orifice 10 of nozzle 9 between 6 and 8 mm, preferably equal to 7 mm;

(24) rate of perforation of precuts 4 of strip 2 between 12 and 30%, preferably between 14 and 20%;

(25) ratio of the force of extraction of toilet paper from the nozzle to the force of tearing of the perforation teeth of two adjacent sheets 5 of strip 2: this ratio is strictly higher than 1, preferably between 1.1 and 2.

(26) Thanks to the invention, a dispenser 1 is obtained comprising a housing 6 and a nozzle 9, that thus fulfills a roll 3 protection function for hygienic and theft deterrence purposes. Delivery is one sheet at a time, while replacement and installation of roll 3 are easy to carry out, in particular with a dispensing orifice 10 of a nozzle 9 sufficiently large to reduce sheet crumpling. The format of sheets 5, in conjunction with the sheet-by-sheet dispensing, results in a decrease of paper consumption by users. In the case of a mounting of housing 6 with its axis perpendicular to support 7, the overall size is bounded by the width of strip 2 and permits an increase in the length of strip 2, thus increasing the autonomy of roll 3, all the more so since said roll has a larger number of sheets 5 per unit of length.

(27) The applicant conducted tests to size the paper roll 3 and the dispenser 1 under a preferred embodiment of the invention, herein in connection with a central unwinding with nozzle 9 in the axis of roll 3. The results of said tests are reported in the Table hereinbelow. For a two-ply paper with 16 g/m.sup.2 grammage for each ply, with a nozzle 9 whose dispensing orifice 10 has a 7 mm diameter, the applicant conducted tests for three different perforation rates, namely 14%, 16% and 20%, each for two sheet formats (245×136 mm.sup.2 and 235×146 mm.sup.2) and within the parameter ranges of the invention. The applicant then measured, by means of a dynamometer, the extraction force of sheets 5 and their tearing force, in centi-newton (cN), the standard deviation being indicated in the Table, first at the beginning of the roll, when sheets 5 are close to the cone in connection with a central unwinding with nozzle 9 in the axis, then after 100 sheets were unwound, after 200 sheets, and after 300 sheets. The average ratios between the extraction force and tearing force are fully within the required ranges, and very good results were obtained as regards the sheet-by-sheet unwinding.

(28) TABLE-US-00002 Perforation rate 14% 16% 20% Sheet dimensions (w × L) 254 × 136 235 × 146 254 × 136 235 × 146 254 × 136 235 × 146 Extraction force (cN) Near the cone 645 +/− 75 830 +/− 140 615 +/− 100 835 +/− 70 750 +/− 110 990 +/− 140 After 100 520 +/− 40 675 +/− 70 575 +/− 90 710 +/− 70 565 +/− 70 770 +/− 230 sheets After 200 540 +/− 45 650 +/− 75 555 +/− 55 650 +/− 90 520 +/− 40 620 +/− 90 sheets After 300 540 +/− 50 645 +/− 80 550 +/− 50 465 +/− 75 500 +/− 50 645 +/− 35 sheets Tearing force (cN) Near the cone 355 +/− 80 330 +/− 60 370 +/− 55 370 +/− 85 490 +/− 65 535 +/− 100 After 100 330 +/− 70 370 +/− 75 380 +/− 75 360 +/− 170 475 +/− 75 620 +/− 80 sheets After 200 310 +/− 55 345 +/− 90 345 +/− 80 400 +/− 60 520 +/− 95 555 +/− 90 sheets After 300 300 +/− 40 315 +/− 95 280 +/− 95 545 +/− 60 585 +/− 195 sheets Ratio of extraction force to tearing force 1.7 2.0 1.6 1.9 1.2 1.3 Rate of success of sheet-by-sheet delivery 100% 100% 100% 100% 99% 99%

(29) The invention was described above in connection with a central unwinding, but it is self-evident that it also applies to a lateral unwinding. Furthermore, in the case of the central unwinding, the nozzle 9 can, as described herein, extend on the periphery of housing 6, but also in the axis of roll 3, which could in this case be horizontal or vertical, regardless of the embodiment selected. Furthermore, a supporting spindle for roll 3 could be provided in housing 6. Finally, nozzle 9 does not necessarily have to be truncated. Any calibrated dispensing orifice could be used.