RU2164775C2 - Roll with central dispensing of tape, dispensing device for roll with central dispensing of tape (versions) - Google Patents

Abstract

FIELD: tape dispensing equipment. SUBSTANCE: roll is composed of two tapes, each provided with weakened lines allowing tape to be divided into plurality of sheets. Weakened lines of one tape are offset from weakened lines of other tape, so that sheets from alternating tapes are separately dispensed for further usage. Weakened lines are made as weak as possible, so that friction force created within opening is minimized, and tape is torn as soon as friction force between tape and opening surface is applied along perforation lines. Tapes do not form hanging parts, since next sheet is available and it may be held by user. Roll is fixed on base provided with rim running around opening. When dispensing device is used, rim extends into central part of roll. Tape is directed through opening from roll internal surface. EFFECT: simplified construction, convenient and efficient usage and consumption of tape. 25 cl, 4 dwg

Description

 The present invention relates to a roll with a central dispensing of the feed tape and, in particular, to a roll with a central dispensing, such as, for example, a cylindrical roll of paper or non-woven material, from which it is supposed to separately issue sheets.

 The central dispensing rolls usually consist of a single tape containing one or more layers of paper or non-woven material that are perforated, so that the tape can be divided into separate sheets. The roll is usually installed in the dispenser when the axis of the roll is upright, with the tape from the center of the roll protruding from the dispenser through an opening usually located at the base of the dispenser. This type of roll and dispenser is often found in public toilets, on a site in front of gas stations, in hospitals, and in industrial plants for use as a dispenser for dispensing hand wipes or tissue paper or wipes for use in ordinary cleaning. In US patents NN 3.150.808 (Wensel), 3.523.653 (Raymond Lee) and 4.274.573 (Finkelstein) describes examples of rolls with a central issuance of tape.

 When using known rolls with a central dispensing tape, a number of problems can arise, mainly due to the peculiarities of perforations in the tape. If the perforations are too weak, then when the end of the tape is pulled, they will often break in the opening of the dispenser or in close proximity to it. This is caused by the natural resistance that the dispenser provides to the tape pulled from the roll through the opening of the dispenser. This gap is permissible for the user when a single sheet is issued, but if he or the subsequent user needs the next sheet, they will have to find the end of the tape in the hole or near it, which may not be easily visible in a vertical dispenser with a lower output, and try to grab and pull out the existing tape. This is clearly inconvenient and would irritate the user if he had wet hands, which could lead to the destruction of the tape in contact with it.

 On the other hand, if the perforations are made stronger in order to more reliably overcome the natural resistance to pulling the tape, then they tend to not tear at all when pulling the end of the tape, which leads to pulling out a long section of the tape from the dispenser. The user will then need to grab the tape with both hands and physically separate one or more sheets from the tape to tear them. And in this case, this problem becomes difficult and even worse if the user has wet hands, which usually leads to crushing the drawn tape into a tight lump that is not suitable for the intended purpose. In addition, the remaining piece of tape hanging from the dispenser may not look attractive to the next user, and if it was dirty, it could be unhygienic. There is also wasteful use of the tape due to the fact that users tend to pull the tape with a longer length from the dispenser than is necessary for the desired use of the tape for cleaning or for wiping after washing. Finally, small pieces of torn tape often fall to the floor under the dispenser, resulting in untidiness.

 Due to the properties of the material from which the tape is formed and due to limitations in the manufacturing process, it is difficult to precisely control the strength of the perforations in the tape. Consequently, manufacturers have so far sought to overcome the above problems by intentionally making the perforations strong enough to force the tape to flow when it is removed from the dispenser, and, as in one case, providing notches along the edge of the hole. After the user has drawn out a sufficient length of the tape, the tape is then pulled at an angle to the notches, which will cause the tape to break at the notches or at the perforations between the user and the notches, depending on the strength of the tape and the perforations. As in other cases, an unsightly torn tape can remain for the next user along with small pieces of tape on the floor, and if the tape is torn in the chipping, it can also cause difficulties and risk of injury for the next user when trying to find and grab the end of the tape . In addition, there is still a tendency to stretch too much tape before tearing it off, since it is possible to stretch only half of the sheet when the tape breaks before the next perforations reach the holes.

 The use of notches in the dispenser complicates its design and increases the cost of its development and manufacture. The size of the dispenser also increases by an additional 5 cm or it is added to the bottom of the dispenser, which is undesirable.

 In another device currently used by the applicants, a V-shaped clamp is made under the dispenser. The shape of the hole is substantially rectangular and has a V-shaped elongation at one end. In use, a certain amount of tape is pulled vertically downward through the hole and then pulled at an angle (usually towards the user), so that the tape is then jammed in the V-shaped clamp and torn. In this case, there are also many of the problems discussed in connection with the serrated hole: the tape remaining unsightly torn off, pieces of tape on the floor, difficulty in finding and gripping the tape, too much or too little tape stretching, crumpled and unusable tape, complexity design of the dispenser and its size.

 To solve this problem, another attempt was made by using a narrowing in the opening of the dispenser, for example, a transverse slot in the rubber, which creates friction when pulling the tape from the dispenser. Thus, when the friction force is transmitted through the perforations, the tape will break, provided that the tensile strength of the perforations is less than the friction force. However, this also has the disadvantage that the tape will tend to rupture as soon as the perforations come into narrowing and experience the action of friction, which results in difficulty in detecting and gripping the next sheet.

 Therefore, there is a need for a roll with a central dispensing tape, from which a separate sheet can be dispensed without forming a hanging piece of tape, thereby eliminating the need for notches, while the next user is provided with the next sheet for easy setting.

 Known systems with folded sheets on one another for issuing separate sheets, however, such systems for reasons related to production equipment are more expensive and difficult to manufacture than rolls.

 The issue of issuing a separate sheet was previously associated with rolls with an external issue of tape. Devices with an external dispensing tape comprise a roll wound from a perforated tape of material usually around a tube or core with a horizontal axis of the roll, with the tape protruding from the outer surface of the roll, and not from its center. Examples are rolls of tape for dispensing napkins for toilets and kitchens.

 US Pat. No. 3,770,172 (Paper Converting Machine Company) describes a roll with an external dispensing tape containing two perforated tapes. The perforations of one tape are offset from the perforations of the other tape. Two tapes are issued through the clamping rollers in the dispenser, and due to the offset perforations, when pulling one tape, its perforations will break at or near the clamping rollers. By this time, part of the next sheet on another tape will protrude from the rollers and will be available for grasping.

 However, such devices with an external dispensing tape require a sophisticated dispenser having an axis for the roll and clamping rollers for the tapes. The axis must rotate in the bearings to reduce friction and minimize the force required to rotate the roll. The clamping rollers must provide the tape with the corresponding resistance force.

 In addition, the perforations must be strong enough to transmit the rotational force necessary to rotate the roll, but at the same time weak enough so that they are relatively easy to rupture outside the dispenser or on the clamping rollers.

 Thus, this device has several disadvantages. In the manufacturing process, it is practically difficult to control the strength of the perforations. On the one hand, they must withstand the resistance of the roll to rotation, and, on the other hand, they must be torn after passing the clamping rollers, whose resisting force cannot be so large as to make the tape too difficult to pull. If the tape is torn inside the dispenser, a complex operation of re-passing the tape through the clamping rollers is required. The dispenser needs moving parts that add value to the product, require careful adjustment and increase the risk of mechanical failure. In addition, if tapes of different thicknesses are used in the dispenser, it is necessary to manually adjust the rollers each time or using the adjusting mechanism to introduce corrections. This may increase the complexity of the dispenser and may be inconvenient for the person recharging the dispenser.

 In European patent N 480848, cl. A 47 K 10/38 of 04/15/1992 disclosed a roll with a central dispensing tape, which is formed from a single non-perforated tape.

 This patent also discloses a dispenser comprising a roll with a central dispensing tape and dispensing means for supporting the roll having an opening for the passage of the tape from the inner surface of the roll.

 A dispenser is described comprising the aforementioned roll and a base provided with a rim extending around the hole and protruding into the center of the roll when used, the tape being able to pass through the hole from the inner surface of the roll.

 A dispenser with the aforementioned roll and dispensing means for supporting the roll having a base provided with a rim extending around the opening and protruding into the center of the roll during use is also known from this patent.

 The above-described roll and dispensers do not provide reliable separation of a single sheet of material from the tape and do not prevent the likelihood of the tape breaking into shreds.

 An object of the present invention is to provide a roll with a central dispensing tape in which a single sheet of material can be separated from the tape in a more reliable manner and in a manner that is less likely to cause the tape to break into shreds.

 This technical problem is solved in that the roll with a central dispensing tape, according to the invention, is formed of two tapes having each weakening line, allowing to divide the tape into multiple sheets, while the weakening lines of one tape are offset relative to the weakening lines of the other tape, so when using the sheets are able to individually protrude from alternating tapes, and the ratio of the strength of the weakening line to the tensile strength of the tape is less than 1: 5.

 Thus, according to the invention, a roll with a central delivery is provided, which allows individual sheets to be dispensed. In use, both tapes are dispensed through the opening of the dispenser, and due to the displacement of the lines of weakening, one tape protrudes further than the other tape. The user will grab and pull the outermost tape, while the frictional force between it and the hole will cause the next line of weakening in this tape to break when it is at or near the hole so that a separate sheet is issued. As this tape is pulled out of the dispenser and a single sheet is peeled off, another tape is also pulled out of the dispenser. Since the attenuation lines are offset, and by this time the line of attenuation of one tape is broken, the first sheet of the next tape is already protruding from the dispenser. Thus, for the next user there is a well presented and untouched sheet.

 The present invention allows one-handed control of the dispensing of a tape from a central dispensing roll. No tearing action is required since the tapes do not form a hanging segment, and furthermore, no notches at the edges of the hole are required. The sheet is easily opened, even if it initially appeared slightly twisted, because an individual sheet is twisted by fewer turns (or even less than one turn) than when stretching longer segments, as is the case in the previously described devices known from prior art.

 Weakening lines across the tape can be at any angle to the edge of the tape. It is preferred that the lines of attenuation be perpendicular to the edge of the tape. Weakening lines in the form of perforations are preferred.

 The strength of the perforations is not as critical in the present invention as in devices of the prior art. Unlike devices with external tape dispensing, through the perforations it is not necessary to exert significant force to rotate the roll; The tape with internal release from the roll is characterized by easier pulling from the roll. Therefore, the minimum allowable tensile strength is reduced. The opening of the dispenser can therefore provide a resistance force that is significantly greater than the minimum allowable strength, so that the tolerance window for perforation strength expands.

 It is preferred that the lines of weakening or perforation are made as weak as possible, so that the frictional force exerted by the hole can be minimized and the tape is torn as soon as the friction force between the tape and the hole is applied to the perforations. When one tape is torn at or near the hole, a portion of the next sheet will already be present on the other tape. Even if the perforations and the hole are designed to tear the tape inside the dispenser, this will not cause problems associated with devices of the prior art, since one tape will have to be supported by another tape (which will protrude from the dispenser at that time) and will be pulled out through the hole when pulling another tape.

 In fact, the strength of the perforations that can be achieved depends on the limitations of the manufacturing process. During the manufacture of the tape for its proper movement in machines, its certain tension is necessary; the perforation strength cannot be less than that required for the necessary tension, otherwise the tape will rupture during its manufacture.

 The desired perforation strength will also depend on the strength of the tape or base web. With a stronger main web, perforations with greater strength are allowed; in order to cause the perforations to break, the opening of the dispenser must be more restraining to provide more friction than the perforations, but since the tape itself is more durable, there is less risk of it breaking in the hole before the sheet becomes detached. For weaker base webs, weaker perforations and a less restraining hole will be required, and there is a greater risk of the tape itself breaking, which makes it necessary to have less friction created in the hole to separate the sheet.

 From the above it can be seen that there is a strict interdependence between the strength and size of the material of the tape, the strength of the perforations and the size of the hole. In practice, these parameters will be coordinated in order to create a satisfactory device for issuing individual sheets, in which the user does not need excessive effort to separate the sheet.

 Preferably, the force required to separate the sheet from the tape is less than about 3000 g. It is possible that a separating force of this order could cause some of the tapes to rupture in the hole, therefore, the preferred operating value for the separating force is about 800 g or less. The minimum achievable separation force will depend on the production process and the minimum tension required in the equipment. It is believed that there is no minimum separation strength below which the tape will not satisfactorily operate when used.

 The configuration of the perforations across the tape may vary according to the manufacturing process, the properties and dimensions of the tapes and the particular application. There are two parameters associated with this: the ratio of the width of the remaining uncut tape to the total width of one perforation and one uncut part (the ratio of the joint) and the number of perforations per unit width of the attenuation line. Both of these parameters can be selected to obtain the desired strength for separation of the sheet and will depend on the thickness of the tape, the strength of the tape and the size of the hole through which the tape is issued. Preferably, the perforations are designed to provide a sheet separation strength of 800 g or less.

 In general, the wider the perforation, the more suitable the connection ratio. When the desired length of each perforation is small, then any change in the length of the perforations due to the manufacturing process will have a greater effect on the remaining uncut length; with longer perforations, similar changes occur, but the effect on the remaining uncut tape is proportionally much less, so that the separation strength is more suitable and reliable. In addition, it is more difficult to cut through smaller perforations in some materials, such as, for example, in thicker materials or in materials from several layers. Therefore, a width of perforations of more than 1 mm is preferred.

 In addition, a tape having short uncut parts has a greater tendency to tear during its manufacture than a tape with the same separation strength, but with longer uncut parts. This is due to the fact that the individual remaining parts of the uncut tape are weaker, and therefore any change in tension across the tape during manufacture can cause the end uncut part to break, resulting in the tape "unfastening" across its width. This is undesirable during the manufacture of the tape. Therefore, tapes with low separation strength and smaller uncut parts are more difficult to manufacture.

 Preferably, the ratio of the compound is about 1: 5 (20%) or less. Preferably, the compound ratio is about 1:10 (10%) or less. Even more preferably, the ratio of the compound is about 1: 20 (5%) or less. Even more preferably, the compound ratio is about 1:30 (3.33%) or less.

 It is clear that this ratio will be similar to the ratio of the strength of the line of attenuation to the strength of the material itself; at 10% perforation, the separation strength of the sheet will be 10% of the tensile strength of the material. However, if the strength of the material approaches the strength of the perforations, then there is a greater risk of tearing the tape itself in the hole and not separating it into single sheets. Therefore, it is preferable that this ratio be less than 20%.

 Each tape preferably has less than about 15 perforations per 10 cm of roll width, more preferably less than about 10 perforations per 10 cm, and more preferably less than about 5 perforations per 10 cm.

 One preferred embodiment of the perforations, which the applicants have found to be satisfactory in practice, is that with a 10% joint ratio with a perforation width of 18 mm and an uncut tape width of 2 mm. However, any suitable perforation is contemplated that will provide the desired separation strength.

 It is believed that any suitable degree of displacement can be used for tapes. The offset can be expressed as a percentage; the ratio as a whole should be 100, but if the offset is unequal, then one sheet will be represented by more than half its length, while the next sheet will be represented by less than half its length, and in total both lengths will be equal to the full length of one sheet. The degree of bias is preferably less than about 70/30, and more preferably less than about 60/40. The optimal offset is about 50/50, with each sheet represented by an amount equal to the number of previous and subsequent sheets. However, it has been found that any bias in the range between 50/50 and 70/30 is satisfactory.

 If there is uneven displacement, it is preferable that after separating the sheet from the inner tape, the outer tape protrudes more than the inner tape protrudes after separating the sheet from the outer tape. When pulling the outer tape from the roll, it will almost certainly pull the inner tape along with it because of the way the tapes are wound. Conversely, pulling the inner tape will have less confidence in pulling the outer tape, because the inner tape does not surround the outer tape; to pull the outer tape more rely on friction between the two tapes. Therefore, it is preferable that the outer tape protrudes each time by a larger amount than the inner tape, for the greater likelihood that the outer tape will be pulled together with the inner tape.

 Tapes can be single-layer or consist of several layers. The size and nature of the hole to achieve a satisfactory friction force will then depend on the physical dimensions of the roll and, in addition, on the thickness of the tapes.

 The present invention will find application in many fields. For example, the central dispensing roll of the present invention can be used for hygiene purposes, such as for hand wipes and wipes, soaked wipes, toilet paper, kitchen towels and thin soft tissue for handkerchiefs, but can also be used in other applications where a device is needed to issue individual sheets. For example, other applications may include dispensers for foil or sticky film, liners for diapers, pouches, such as those available in supermarkets, etc.

 The present invention is suitable for any type of material from which a tape perforated and rolled up can be formed. For example, the tape may be formed of paper, non-woven material or film and may be natural or synthetic. Since the present invention has less waste (individual sheets are delivered individually and cleanly rather than forming a piece of tape), the invention can also be used to dispense more expensive materials that were not previously dispensed from a central dispensing roll. Examples of more expensive materials that may be dispensed in this device are HydroKnit, which is a hydraulically interwoven non-woven fabric with high strength and abrasion resistance made by the applicants, Kimtex, which is a fabric made of synthetic thermoplastic fibers for industrial use and others areas also manufactured by the applicants, and medical sheets having a polyethylene protective layer with cellulose fluff on one surface for use in op diet.

 The present invention is also suitable for dispensing two-dimensional sheets from a roll whose width is equal to half the width of the sheet. This is achieved by folding the tapes in half along their length (i.e., in the direction of the machine) before winding the roll. Perforation can be performed before or after folding the tapes. When a sheet is issued, it will be folded in half and can be expanded to produce a sheet with doubled width. Similarly, triple or larger sheets can also be obtained.

 The central dispensing roll according to the present invention can be made by winding two tapes having lines of weakening, such as perforations, which have the necessary offset. This offset can be achieved by feeding each non-perforated tape to the offset punching device before the tapes are combined to form a roll. Alternatively, the tapes can first be brought together and then fed into a single perforating device, where they are simultaneously perforated. To achieve displacement, the tapes are then disconnected, and one tape, unlike another tape, is forced to travel an extra distance before they are combined again and wound into a roll. This latter method has the advantage that only one perforating device is needed, which thus simplifies the production process and reduces the manufacturing cost.

According to another aspect of the invention, there is provided a dispenser with a roll with a central dispenser, comprising:
a roll with a central extension formed of two tapes having weakening lines allowing the tape to be divided into multiple sheets, wherein the weakening lines of one tape are offset from the weakening lines of the other tape, so that in use the sheets can be separately separated from alternating tapes, and
- a dispenser for supporting the roll, having an opening through which tapes can pass from the inner surface of the roll, while the perforation strength in each roll is selected so that the tape can be pulled out from the center of the roll, but is torn as a result of resistance created near or inside the opening.

 It is assumed that a roll with a central extension will give out a tape for any orientation of its axis, however, a vertical axis is preferable so that the tapes protrude either from the upper or lower end of the roll. It is preferable to extend the tapes from the bottom of the roll so that the tapes can hang down and are easier to grasp.

 It is assumed that the hole in the dispenser may simply be a hole. As discussed above, notches are required around the hole, since the tape will not need to be cut to separate the sheet. The size of the hole will depend on the material properties of the tapes. An important criterion is that there is a frictional force between the drawn tape and the hole, which would be sufficient to break the line of weakening or perforations in the tape when this force is transmitted along the line of weakening. This eliminates the need for the user to physically separate the sheet from the tape.

 Thus, the required friction force and, consequently, the size of the hole will partly depend on the strength of the perforations. The stronger the perforation, the smaller the required hole, however, this can lead to rupture and wrinkling of the napkin. Therefore, for best perforation efficiency, it is preferable to perform as weak as possible, so that the hole can be made large. As discussed above, the size of the hole will also depend on the physical dimensions of the tape and individual sheets, such as thickness, flexibility, and width.

 Although it is anticipated that the central dispensing roll of the present invention will operate with existing dispensers, the applicants have developed new bases and holes that complement the central dispensing roll.

 This is a new step, and according to an additional aspect of the invention, there is provided a basis for use with a central dispensing roll formed of two tapes having weakening lines that allow the tape to be divided into multiple sheets, wherein the weakening lines of one tape are offset from the weakening lines of the other tape, moreover, the base is equipped with a rim extending around the hole, protruding into the center of the roll during use, whereby the tape can pass through the hole from the inner surface of the roll, and both ensures, sufficient resistance so that the sheets can be dispensed singly from alternate strips.

 It is contemplated that the base rim protruding into the center of the roll may have any suitable cross section, such as round, elliptical, or polygonal. A circular cross section is preferred, with the rim that projects into the roll will be in the shape of a truncated cone with its narrower section farthest from the base.

 Preferably, the central delivery roll is formed, as described above, from two tapes, and the weakening lines of one tape are offset from the weakening lines of the other tape, so that in use the sheets can be ejected separately from alternating tapes.

 Thus, the design of the hole still allows you to issue separate sheets when it is used with the above-described roll with a central output, consisting of two tapes with offset perforations, however, it also has an advantage over a conventional hole, such as a hole in the dispenser, which lies in less effort to issue sheets. The base is equipped with a rim, along the upper edge of which the perforations tend to separate along the width of the tape sequentially (“unfastening”), and not simultaneously (“tearing”), as would happen with a two-dimensional hole. As you pull the tape, one edge of the tape drags along the upper edge of the rim around the hole, and the force with which the tape is pulled is concentrated at this point. Therefore, after the line of weakening reaches the rim, the concentrated force causes the perforations to rupture sequentially from this point through the tape to its other side. Thus, the force for dispensing the tape is reduced since the user does not tear all the perforations across the tape at the same time. In practice, the tensile strength of the perforations can be successfully increased in relation to the force for issuing the tape, "felt" by the user, since there is a more effective tearing effect. This has manufacturing advantages.

 Incidentally, weakening lines that are not perpendicular to the edge of the tape but located at some other angle to it can also tend to “unfasten” rather than “tear” when they are projected through a regular flat hole, realizing advantages like achieved with a new hole design.

 The hole is not required to be part of the dispenser. For example, the base could be formed as an insert in the end of the roll; the roll plus base could then be inserted into a conventional dispenser. On the other hand, a base structure could be created as an insert for modifying existing dispensers, or it could be integrated into the dispenser itself.

 With a conventional base and hole, which are located near one end of the roll, and not inside the center of the roll, it is necessary to adjust the size of the hole depending on the strength of the perforations and the dimensions of the material to provide sufficient friction to achieve a gap. As a result of this, the sheet can sometimes appear wrinkled, folded and even torn along its length. It has also been found that this new type of hole, and especially in the form of a truncated cone, can also flatten the sheet to some extent so that it is not so “folded” as with a conventional hole.

 The advantage of being able to use tapes with greater perforation strength is less dependent on the production process; as discussed above, it is difficult to achieve very low perforation strengths.

 Another advantage of this type of aperture is that a pocket forms on the outside of the aperture, which is a suitable space to place a seal, such as a sealing cap, which may be useful when using the invention to dispense soaked wipes. The seal will prevent the wipes from drying out and ensure that the next wipes to be dispensed remain wet.

 The base can be formed from any suitable material, such as metal, plastic or cardboard.

According to a fourth aspect of the invention, there is provided a dispenser with a roll with a central dispenser, comprising:
- a roll with a central extension formed of at least one tape having weakening lines allowing the tape to be divided into multiple sheets, and
- a dispenser for supporting the roll, having a base that is provided with a rim extending around the hole and protruding into the center of the roll when used, the tape passing through the hole from the inner surface of the roll, and the perforation strength in this or each tape is selected so that the tape can elongate from the center of the roll, but breaks as a result of the resistance created near or inside the hole.

Below, by way of example only, embodiments of the invention will be described with reference to the accompanying drawings, in which:
figure 1 depicts a top view of a roll with a Central issue in accordance with the present invention;
FIG. 2 is a perspective view of a central delivery roll shown in FIG. 1, when used in a dispenser;
FIG. 3A is a perspective view of a base according to another aspect of the invention suitable for use with a central dispensing roll according to the invention;
FIG. 3B is a base and a roll with a central outlet according to the invention when used;
FIG. 4 is a vertical view of a device for manufacturing a roll with a central outlet according to the invention.

 In FIG. 1 shows a roll with a central extension or a cylindrical roll 1 according to the invention. The roll is slightly unwound from its outer surface to show an offset arrangement of perforations. It should be noted that when using a roll, the tapes will protrude from the inner surface, and the tapes on the outer surface will usually be fastened to one another so that the roll does not unwind as shown in FIG. 1.

 The roll contains an inner tape 2 and an outer tape 3, each of which has perforations 4, which allow individual sheets to separate from the tapes. The individual sheets are X lengths. The roll is made of paper and is suitable for use as hand wipes or other wipes.

 The displacement of the perforations is shown as line Y, and in this embodiment, the displacement is 50/50.

 FIG. 2 shows a roll 1 when used in a dispenser 6. To simplify this figure, the dispenser is shown only in outline. The inner and outer tapes 2 and 3 protrude through the opening 7 of the dispenser, and due to the offset perforations, the sheet 8 of the inner tape 2 protrudes further from the dispenser than the sheet 9 of the outer tape 3. When it is necessary to give out the sheet, the user grabs the sheet 8 and pulls it down until a frictional force is applied through the perforations 10 between the inner tape 2 and the rim of the hole 7. The sheet 8 will then detach, leaving the end of the next sheet 11 of the inner tape at the hole 7. While the inner tape extends Apparently, the outer tape 3 simultaneously moves downward due to its winding together with the inner tape, and by the time that the sheet 8 becomes detached, the sheet 9 will protrude from the dispenser by an amount similar to that which the sheet 8 shown in FIG. . 2. Thus, sheets are fed from alternating tapes.

 To test the strength of the perforation line for separation, you can use the European standard test method "Kimberly-Clark" number KCN-060. In this test, the Instron universal testing device is used to reproduce the separating action between two adjacent sheets of a perforated product. For a 200 mm wide roll, the sheets were folded three times along the direction of the machine and before the start of the test they were placed in the 76 mm clamps of the Instron device. The clamps initially had a gap of 102 ± 2 mm. The upper clamp was pushed up from the lower clamp at a constant speed of 250 mm / min until the perforations broke. It was possible to measure total energy (kg / mm), maximum load (g), elongation in percent at maximum load (%) and total elongation in percent (%).

 In this way, it is also possible to measure the tensile strength of the material in a selected direction (usually in the direction of the machine) using an unperforated sample. In practice, a sample with a width of 50 mm is tested, and the result is multiplied by 4 to obtain a tensile strength value for a roll of 200 mm wide.

 In FIG. 3A shows a base 12 according to another aspect of the invention. The base consists of a circular plate 13 having in the middle a rim 14 in the form of a hollow truncated cone. As shown in FIG. 3B, in use, the base is placed near one end of the cylindrical roll 1, with the rim protruding into the central cavity of the roll 1. Tapes 2 and 3 pass through the hole 14, while the upper edge 15 of the rim forms an edge on which the perforations are sequentially divided along the width of the tape.

 In FIG. 4 shows a device suitable for manufacturing a central dispensing roll according to the present invention. From the original rolls 16, the inner and outer tapes 17 and 18 are fed to the unwinding machine, which are combined together and fed into a single punching device 19, where perforations 20 are simultaneously performed in the tapes. In order to obtain tapes with the necessary offset before winding the roll with a central output, the outer tape 18 is forced to make a greater path than the inner tape 17, passing it around the roller 21. The position of the roller can be adjusted in the direction perpendicular to the direction of movement of the tapes, so that you can adjust Degree of displacement for different products. After the perforations are shifted, both tapes are wound into a roll 22.

Claims (25)

 1. A roll with a central dispensing tape, characterized in that it is formed of two tapes having each weakening line, allowing to divide the tape into multiple sheets, while the weakening lines of one tape are offset from the weakening lines of the other tape, so that when used, the sheets are capable of separately issued from alternating tapes, and the ratio of the strength of the weakening line to the tensile strength of the tape is less than 1: 5.  2. The roll according to claim 1, characterized in that the force required to separate the sheet from the tape is less than about 3000 g.  3. The roll according to claim 1, characterized in that the force required to separate the sheet from the tape is less than about 800 g.  4. Roll according to any one of paragraphs.1 to 3, characterized in that the line of weakening is made in the form of perforations.  5. The roll according to claim 4, characterized in that the perforation width is greater than 1 mm.  6. Roll according to claim 4 or 5, characterized in that the ratio of the compound is about 1: 5 or less.  7. Roll according to claim 4 or 5, characterized in that the ratio of the compound is about 1: 10 or less.  8. A roll according to claim 4 or 5, characterized in that the ratio of the compound is about 1: 20 or less.  9. A roll according to claim 4 or 5, characterized in that the ratio of the compound is about 1: 30 or less.  10. A roll according to any one of claims 4 to 9, characterized in that each tape has less than about 15 perforations per 10 cm of the width of the roll.  11. A roll according to any one of claims 4 to 9, characterized in that each tape has less than about 10 perforations per 10 cm of the width of the roll.  12. A roll according to any one of claims 4 to 9, characterized in that each tape has less than about 5 perforations per 10 cm of the width of the roll.  13. A roll according to any one of claims 1 to 12, characterized in that the ratio of the displacement of the perforations of one tape relative to the perforations of the other tape is less than about 70: 30.  14. A roll according to any one of claims 1 to 13, characterized in that the ratio of the displacement of the perforations of one tape relative to the perforations of the other tape is less than about 60: 40.  15. A roll according to any one of claims 1 to 14, characterized in that the ratio of the displacement of the perforations of one tape relative to the perforations of the other tape is about 50:50, so that each sheet is present in an amount equal to the number of previous and subsequent sheets.  16. A roll according to any one of claims 1 to 15, characterized in that the tape is formed of paper or non-woven material or film.  17. A dispensing device with a roll with a central dispensing tape, comprising a roll with a central dispensing tape and dispensing means for supporting the roll, having an opening for the passage of the tape from the inner surface of the roll, characterized in that the roll is made according to any one of claims 1 to 16, and the strength of the attenuation line in each tape is selected such that the tape is able to stretch out from the center of the roll, but is able to tear as a result of the resistance created near or inside the hole.  18. The dispensing device according to 17, characterized in that the axis of the roll is vertical.  19. The dispensing device according to p. 18, characterized in that when using the tape can be issued from the bottom of the roll.  20. A dispensing device with a roll with a central dispensing tape, comprising a roll with a central dispensing tape and a base provided with a rim extending around the hole and protruding into the center of the roll when used, the tape being able to pass through the hole from the inner surface of the roll, characterized in that the roll is made according to any one of paragraphs.1 to 16, and the rim is able to provide sufficient resistance so that the sheets are individually issued from alternating tapes.  21. The dispensing device according to claim 20, characterized in that the rim has a circular cross section.  22. The dispensing device according to claim 20, characterized in that the rim is made in the form of a truncated cone with its narrower section, farthest from the base and protruding further into the roll when used than its wider section.  23. A dispensing device according to any one of paragraphs.20-22, characterized in that the base is formed as an insert in the end of the roll.  24. A dispensing device according to any one of paragraphs.20-23, characterized in that the base is formed of plastic or cardboard.  25. A dispensing device with a roll with a central dispensing tape, comprising a roll with a central dispensing tape and dispensing means for supporting the roll, having a base provided with a rim extending around the hole and protruding into the center of the roll in use, characterized in that the roll is made according to any one of claims 1 to 16, and the specified tape or each tape is able to pass through the hole from the inner surface of the roll, while the strength of the line of weakening in each tape is selected so that the tape is able to stretch from the center of the roll it, but capable of rupture as a result of resistance generated near or within the aperture.

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