CN1208332A - Center output reel - Google Patents

Abstract

A centre-feed roll (1) is disclosed which is formed from two webs (2, 3) each having lines of weakness (10) which allow the web to be separated into a plurality of sheets (8, 9, 11). The lines of weakness of one web are offset from those of the other such that in use the sheets can be dispensed singly from alternate webs. The lines of weakness (10) are manufactured to be as weak as possible such that the frictional force exerted by the aperture (7) may be minimised and the web will break as soon as the frictional force between the web (2, 3) and the aperture (7) is present across the perforations. The webs do not form a rope and the next sheet is presented for the next user to grasp easily. A base for use with a centre-feed roll is also disclosed. The base is provided with a rim extending around an aperture, the rim projecting into the centre of the roll in use. The web passes through the aperture from the inner surface of the roll.

Description

Center output reel

The present invention relates to a center output fabric dispensing roll, and more particularly to a center output roll, such as a circular roll of paper or nonwoven fabric, from which sheets are dispensed individually.

The central output roll typically includes a single fabric comprising one or more layers of paper or nonwoven material that is partially perforated so that the fabric can be separated into individual sheets. The roll is usually mounted in a dispenser with its axis vertical and the fabric exits the dispenser from the center of the roll through an outlet opening, usually located at the bottom of the dispenser. Rolls and dispensers of this type are often found in public restrooms, on gas station front desks, and in hospitals and industry, either as a dispenser for one hand paper towels or as a dispenser for a general purpose cleaning tissue or towel. U.S. Patent Nos. 3,150,808 (Vensel), 3,523,653 (Raymond lee) and 4,274,573 (Finkelstein) disclose some embodiments of center delivery reels.

Problems can occur with known central output roll systems, primarily due to the nature of the perforations in the fabric. If these perforations are partially too fragile, they often break at or very close to the dispenser outlet opening when the end of the fabric is pulled out of the outlet opening. This is due to the inherent resistance in the system that prevents the fabric from being pulled from the roll through the output aperture. The user can accept this break at the time, because a single sheet is dispensed anyway, but if the user or his successors need another sheet, then they must be in or near the output hole Find the end of the fabric and then grab the found fabric to pull it out, however, the end may not be easily visible in a vertically mounted bottom distribution system. This operation is undoubtedly very inconvenient, and if the user's hands are wet, the fabric will crumble after contact with the hands, and this situation will be aggravated.

On the other hand, if the perforations are made stronger and reliably overcome the inherent resistance to pulling the fabric out, these perforations may not break at all when the fabric end is pulled, resulting in a long string or A long strip of fabric is pulled out of the dispenser. The user will then have to grasp the fabric with both hands and manually separate the sheet or sheets from the fabric to separate them. This problem is also troublesome, and the problem is made worse by the user's wet hands, because tearing the continuous fabric sheet with wet hands usually pinches the pulled fabric into a dense rope, This rope is certainly not suitable for the intended purpose of the user. In addition, the leftover fabric hanging from the dispenser may look unsightly to subsequent users and may be unhygienic if the leftover has become soiled. There may also be wastage of fabric as the user may pull longer fabric from the dispenser than is required for cleaning or drying. One last point is that the small pieces from tearing the fabric can often end up on the floor beneath the dispenser, leaving the floor untidy.

Precise control of the strength of the perforated portions of the fabric is difficult due to the inherent properties of the materials from which the fabric is formed and the limitations of the manufacturing process. Therefore, heretofore manufacturers have tended to overcome the above problems by deliberately making the perforations strong enough to allow the fabric to exit the dispenser in strips, and in one system some serrations have been provided around the edges of the output holes to overcome the above problems . Once the user has pulled out a sufficient length of fabric, pulling the fabric at an angle transverse to the teeth will cause the fabric to break either at the teeth or at the perforated portion between the user and the teeth. Where it breaks depends on the relative strengths of the fabric and perforation. Like some other systems, this system also leaves subsequent users with an unsightly ripped fabric and small pieces of fabric scattered on the floor, possibly causing subsequent wear and tear if the fabric breaks at the serrations. It is difficult for a user to find and grasp the end of the fabric and may injure subsequent users. If the fabric breaks before the next perforation section reaches the output hole, only half a sheet can be pulled out, and precisely because of this possibility, the possibility of pulling out too long of the fabric before the saw teeth cut it will still exist.

Providing serrations on the dispenser adds to the complexity of the dispenser design, as well as the cost of modification and production. In addition, the size of the dispenser would also increase, since the base of the dispenser would be increased by around 5 cm, which is undesirable.

In another system currently used by the user, a "V" shaped handle is provided on the underside of the dispenser. The output aperture is generally rectangular in shape with a "V" shaped extension at one end. In use, a certain length of fabric is drawn vertically downward through the output hole, and then pulled at an angle (usually toward the user) to cause the fabric to squeeze into the "V" shaped handle and break. With this zig-zag output hole, many of the problems above will still be present: Untidy fabric left over after tearing, fabric crumbs on the floor, difficulty finding and grabbing fabric, not much fabric being pulled , is too little and is not suitable for use in a bunch, and the design of the dispenser is more complicated and the size is larger.

Another attempt to overcome these problems has been to provide a restriction, such as a rubber cross opening, at the outlet of the dispenser that provides friction as the fabric is pulled from the dispenser. Therefore, when the frictional force is transmitted to the perforated parts, if the breaking strength of these perforated parts is smaller than the frictional force, the fabric will break. However, this also has the disadvantage that the fabric may break while the perforated portion is being rubbed by the restraining means, with the result that the next sheet is difficult to find and grasp.

Therefore, there is a need for a central output reel from which individual sheets can be dispensed, which avoids the formation of a rope of fabric, thereby eliminating the need for a sawtooth structure, and exposing the next sheet for subsequent users Easy to grab.

The known system of folding alternating sheets can achieve a single sheet output, but this system is somewhat more expensive and more complicated to manufacture than a roll product due to the manufacturing machinery.

The problem of individual sheet dispensing has previously existed with external output reels. External output systems consist of a roll of a perforated portion of fabric material, usually wound around a tube or core, in which the axis of the roll of fabric is mounted horizontally, and the fabric flows from outside the Distributed from the surface rather than from the center. Bathroom and kitchen towel rolls are examples of external output rolls.

US Patent No. 3,770,172 (Paper Converting Machinery Co.) discloses an external output roll comprising two perforated fabrics, the perforated sections of one fabric being offset from the perforated sections of the other fabric. The two fabrics are output through the clamping reel on the dispenser, just because the perforated parts are staggered from each other, when a fabric is pulled out, the perforated part of the fabric will break at or near the clamping reel . At this point, a portion of the next sheet of another fabric has protruded from the reel so that it can be caught.

However, such an external delivery system requires a complex dispenser which must have a mandrel for the roll and holding reels for the fabric. The mandrel must turn on bearings to reduce friction and minimize the force required to turn the mandrel. The resistance exerted by the clamping spool on the fabric must be just right. Furthermore, the perforated portion needs to be strong enough to be able to transmit the rotational force required to turn the reel, but at the same time weak enough to break relatively easily outside the dispenser or at the gripping reel.

Therefore, this system has some disadvantages as follows. In fact the strength of the perforated part is well controlled during manufacture. On the one hand, the perforations must overcome the rotational resistance of the roll, and on the other hand, they must break after passing through the holding reel, whose resistance must not be too high, otherwise the fabric will be difficult to pull out. If the fabric breaks in the dispenser, it is necessary to re-pass the fabric through the gripping reels, which is a complicated operation. The dispenser requires moving parts, which adds to the cost of the system, and the dispenser requires careful adjustment, increasing the likelihood of mechanical failure. Again, if fabrics of different thicknesses are used in the dispenser, the rolls must be adjusted each time either manually or with an adjustment mechanism to account for the difference in thickness. This invisibly adds to the complexity of the dispenser and can be very inconvenient for the person refilling the dispenser.

According to one aspect, the present invention provides a central output reel formed from two fabrics each having frangible threads which allow the fabric to be separated into sheets, the frangibility of a fabric The broken threads are offset from the frangible threads of another fabric so that, in use, individual slices can be dispensed from alternate fabrics.

Accordingly, the present invention provides a central output spool that allows dispensing of individual sheets. In use, two fabrics are output from an output hole of the dispenser, and because the frangible threads of the two fabrics are mutually misaligned, one fabric will protrude more than the other fabric. When the user grasps and pulls the outermost fabric, friction between the fabric and the delivery hole causes the next frangible thread of the fabric to break at or near the delivery hole, thus dispensing a single sheet. Just as the fabric is pulled out of the dispenser and a sheet is separated therefrom, another fabric is also pulled out of the dispenser. Since the frangible threads are offset from each other, when the frangible thread of one fabric breaks, the head of a sheet of the other fabric is already protruding from the dispenser. Thereby, a clean looking and untouched sheet is provided for the subsequent user.

The present invention allows only one hand to control the dispensing operation from a central output roll. No tearing action is required as the fabric does not form a cord and therefore no serrations or edges are required around the output aperture. The sheet unrolls easily, even if it initially curls up slightly, because a single sheet twists less (or even less than one turn) than the longer lengths of fabric that are pulled out in the aforementioned prior art systems.

The frangible threads may be placed across the fabric at any angle relative to the edge of the fabric. Preferably, the frangible lines run perpendicular to the edge of the fabric. Preferably, the frangible wire is made in the form of a perforated portion.

The strength requirements for the perforated portion of the present invention are less stringent than those of prior art systems. Unlike external output systems, the main force of rotating the roll need not be transmitted through the perforated section; an internal output fabric is inherently easy to pull from the roll. The minimum permissible tear strength is thus reduced. The dispenser output orifice can thus provide a resistance much greater than the minimum allowable strength and, therefore, the range of variation in perforation strength can be extended.

The frangible thread or perforation is preferably made as weak as possible so that the friction generated by the outlet hole is minimized so that the fabric breaks as soon as friction between it and the outlet is applied to the perforation. When one web breaks at or near the output aperture, a portion of the next sheet on the other web is already exposed. Even if the perforated portion and output hole were designed in such a way that the fabric would break within the dispenser or the output hole, it would not cause the problems encountered with prior art systems because one fabric would be supported by another fabric (at this point the fabric would be released from the dispenser). protruding from the tool) and is also drawn out of the output hole when this other fabric is pulled.

In fact, the achievable perforation strength is limited by the manufacturing process. When processing fabrics, the machine requires a certain tension in the fabric in order to function correctly; the strength of the perforated part cannot be lower than this required tension, otherwise the fabric will break during processing.

In addition, the desired strength of the perforated portion also depends on the strength of the fabric or base sheet. The stronger the base sheet, the greater the strength of the perforated part it can withstand; in order to break the perforated part, the output hole needs to impose more restraint to provide a friction force greater than the strength of the perforated part, however, Since the fabric itself is relatively strong, it is unlikely that the fabric will be torn at the output aperture before a sheet separates. A weaker base sheet requires a more fragile perforation and a relatively less restrictive output hole because the fabric is more likely to be torn, which requires the output hole to provide a less frictional force to Separate a flake.

From what has been said above, it can be seen that there is a strong interrelationship between the strength and size of the fabric material, the strength of the perforated portion, and the size of the output holes. In a particular application, these parameters can be adjusted to provide a satisfactory single tablet dispensing system in which the separation force exerted by the user is not high.

Preferably, the force required to separate a sheet from the fabric is less than about 3000 g. A separation force of this magnitude may cause some of the fabric to disintegrate in the output aperture, so an optimal operating value for the separation force is about 800 g or less. The minimum allowable separation force will depend on the manufacturing process and the minimum tension required by the machine. We believe that the fabric can exhibit satisfactory in-use performance at any minimum detachment strength.

The configuration of the perforations across the fabric may vary depending on the manufacturing process, the nature and size of the fabric, and the particular application. It mainly includes the following two variable parameters: the ratio of the width of the remaining uncut fabric to the total width of one perforated part plus one uncut part (connection ratio), and the number of perforated parts per unit width of the frangible thread. Both of these parameters can be adjusted to determine the desired flake separation strength, and these parameters will depend on the thickness of the fabric, the strength of the fabric and the size of the output aperture from which the fabric is dispensed. Preferably, the perforated portion is suitably configured to obtain a separation strength of 800 g or less.

In general, the wider the perforated portion, the more consistent the connection ratio will be. When the required length of each perforated part is small, the change in the length of the perforated part caused by manufacturing process factors has a greater impact on the remaining uncut length; when the perforated part is large, the same change has a corresponding effect on the uncut fabric. The influence is much smaller, so that the separation strength is more stable and reliable. And on some kinds of materials, such as thicker materials or multi-layer materials, it is difficult to cut small perforations. Therefore, the width of the perforated portion is preferably greater than 1 mm.

Also, fabrics with shorter uncut portions are more likely to break during processing than fabrics with longer uncut portions at the same separation strength. This is due to the fact that the single remaining portion of the uncut fabric is relatively weak, so any change in the tension applied to the fabric during processing may cause the uncut portion at the end to tear, eventually causing the fabric to It is "unzipping" across its width. This is the last thing you want to see in machining. Therefore, fabrics with lower separation strength and shorter uncut portions are more difficult to process.

The connection ratio is preferably about 1:5 (20%) or less. Preferably, the connection ratio is about 1:10 (10%) or less. The connection ratio is preferably about 1:20 (5%) or less. It is excellent if the connection ratio is about 1:30 (3.33%) or less.

Obviously, this ratio is the same as the ratio between the breaking wire strength and the strength of the material itself; if the perforation is 10%, then the separation strength of the sheets is 10% of the tensile strength of the material. However, the closer the perforated section strength is to the material strength, the more likely it is that the fabric will shred rather than split into individual sheets at the output hole. So the ratio is preferably less than 20%.

Preferably, the fabric has no more than about 15 perforations per 10 cm of roll width, more preferably no more than about 10 perforations per 10 cm, most preferably no more than 5 perforations per 10 cm .

A preferred structure of the perforated part is that the connection ratio is 10% and the perforated part width is 18 mm, and the width of the uncut fabric is 2 mm at this time, and the applicant of the present invention finds that this structure works satisfactorily in specific applications. Of course, other suitable perforated portion configurations are also conceivable to achieve the desired separation strength.

It is contemplated that any suitable amount of misalignment may be used for the fabric. This misalignment is expressed as a percentage; the total ratio must be 100, because if the misalignment is uneven, one flake will be exposed longer than half its entire length, and the next flake will be exposed longer than half of its entire length. Half of the whole length is shorter, and the sum of the two lengths equals the whole length of a sheet. More preferably, the dislocation ratio is less than about 70/30, more preferably less than about 60/40. The optimum misalignment is about 50/50, ie the exposed length of each sheet is equal to the exposed length of the preceding and following sheets. However, any deviation in the range of 50/50 to 70/30 was found to be sufficient to work normally.

If there is a non-uniform offset exposed length, it is preferred that the outer fabric protrudes a greater length after a sheet is separated from the inner fabric than the inner fabric protrudes after a sheet is separated from the outer fabric. As the outer fabric is being pulled from the roll, it will necessarily always drag the inner fabric, which is determined by the way the fabric is wound. Conversely, when the inner fabric is pulled, the outer fabric is much less necessarily dragged, because the inner fabric does not surround the outer fabric; so pulling the outer fabric relies more on friction between the two fabrics. Therefore, the outer fabric preferably protrudes more each time than the inner fabric, so that the outer fabric can have more opportunities to be pulled out together with the inner fabric.

Fabrics can be single or multi-layered. In order to obtain satisfactory friction, the size and characteristics of the output hole must be determined according to the thickness of the fabric and the actual size of the roll.

The present invention can be applied in various fields. For example, the center output roll of the present invention can be used in hygiene applications such as hand towels, and in wiping applications such as soaked wipes, toilet paper, kitchen wipes, and facial tissues, but can also be used in other applications where a single sheet dispensing system is suitable. For example, other applications of the invention are dispensers for thin metal films or stickers, brushed linings, packages such as those used in supermarkets, and the like.

The present invention is applicable to any kind of material as long as the material can be formed into a fabric and can be perforated and rolled. For example, fabrics can be formed from paper, nonwoven materials, or films, and these fabrics can be naturally occurring or synthetic. Because the invention produces very little waste (individual sheets are dispensed one by one, cleanly and without twisting), the invention can also be used to dispense more expensive materials that were not previously dispensed from a central output reel . Examples of more expensive materials that can ^be dispensed in this system are Hydroknit ^R (a hydraulically entangled nonwoven fabric produced by A synthetic thermoplastic fiber fabric used in industry or other fields), and a medical sheet in the operating room having a polyethylene barrier with pulp fluff on its surface.

The invention is also suitable for supplying dual size sheets from a roll which is half the width of the sheet. This is achieved by folding the two fabrics in half along their length (ie, machine direction) before the roll is rolled. The perforated part work can be done before or after the fabric is folded. When the sheet is dispensed, it is folded in half and opened to provide a sheet with twice the width. In the same way, triple size sheets or larger sheets can also be provided.

The center output roll of the present invention can be made by rolling two fabrics with frangible threads, such as perforated portions, which should have the desired amount of misalignment. This amount of offset can be achieved by pre-feeding each unperforated portion of the fabric into an offset perforator before the fabrics are combined to form a roll. It is also possible for the two fabrics to be brought together and fed together into a perforator where they are simultaneously perforated. In order to obtain the desired degree of misalignment, the webs are separated after the perforated portion, and one web is moved a longer distance than the other before they are rejoined on a roll. The advantage of the latter method is that only one perforator is enough, thereby simplifying the manufacturing process and reducing the manufacturing cost.

According to another aspect, the present invention provides a central output roll distribution system comprising:

A central output drum formed of two fabrics, each having frangible threads to allow the fabric to be separated into sheets, the frangible threads of one fabric being misaligned with those of the other fabric so that in use they can be Dispensing slices one by one from alternating fabrics; and

a dispenser for supporting a roll and having an output hole therein through which the fabrics are output from the inner surface of the roll, the strength of the perforated portion of each fabric being properly selected so that the fabric can flow from the roll The center pulls out and breaks against the resistance provided near or within the output hole.

It is conceivable that the central output roll can dispense sheets regardless of the orientation of its axis, however, its axis is preferably vertical so that the fabric is output from either the top or the bottom of the roll. The fabric is best delivered from the bottom of the drum as this allows the fabric to hang down for easier grabbing.

It is conceivable that the output aperture on the dispenser could be a simple aperture. As mentioned above, there is no need for serrations around the output aperture, since there is no need to tear the fabric in order to separate a sheet. The size of the output hole will depend on the material properties of the fabric. The most important criterion is that the friction between the fabric being pulled and the output aperture is sufficient to tear the frangible thread or the perforated portion of the fabric when it is applied to the frangible thread. This eliminates the need for the user to manually separate the sheet from the fabric.

Thus, the required frictional force and the corresponding size of the output aperture will depend in part on the strength of the perforated portion. The stronger the perforated section, the smaller the output hole needs to be, but this can cause the towel to tear or wrinkle. So in order to get the best performance, the perforation part should be made as weak as possible so that the output hole can be made larger. As mentioned above, the size of the output aperture also depends on the actual dimensions of the fabric and individual sheets, such as thickness, elasticity and width.

Due to the keen desire to fit the central delivery reel of the present invention on existing dispensers, the applicant has developed a completely new base and delivery hole which is compatible with the reel of the present invention.

This is a new way of outputting, and according to another aspect of the invention, the invention provides a base for use with a central output reel consisting of one or more fabrics each having an easy Breakable threads, these breakable threads allow the fabric to be separated into several sheets, wherein the base is provided with a flange extending around an output hole, which in use protrudes inside the center of the drum so that the fabric can be released from the drum The inner surface passes through the output hole.

It is contemplated that the flange of the base projecting into the center of the drum may have any suitable cross-section, such as circular, oval or polygonal. Preferably annular in cross-section, the flange projecting into the drum is preferably frusto-conical with its narrow end remote from the base.

Preferably, the central output reel is formed from two fabrics as described above, the frangible threads of one fabric being offset from the frangible threads of the other fabric so that, in use, individual sheets can be dispensed from alternate fabrics.

Thus, the design of this output aperture still allows single sheet dispensing operations when used with the aforementioned central output reel with two fabric perforated portions offset, and which also has a conventional output aperture, such as a dispenser A hole formed above does not have the advantage that it requires only a small dispensing force. The base provides a flange on which the perforated portion tends to gradually split ("pull apart") across the width of the fabric when the perforated portion is at the edge of the flange, rather than split simultaneously as would occur with a 2D output hole ("burst"). As the fabric is pulled, one edge of the fabric scrapes over the upper edge of the flange around the output hole and the force pulling the fabric is concentrated at this point. Thus, once the frangible thread reaches the flange, the concentrated force causes the perforated portion to gradually tear from that point across the fabric to the other side. According to this method, since the user does not pull off the perforated portions in the transverse direction of the fabric at the same time, the distribution force can be reduced. In practice, since there is a very effective sawing action, the tear strength of the perforated portion can be higher than the dispensing force "felt" by the user, which is very advantageous. Such a structure also has advantages in terms of manufacturing.

Incidentally, frangible threads not perpendicular to the edge of the fabric, but at some other angle, can likewise exhibit a tendency to "pull apart" rather than "burst" when the fabric is dispensed through a generally planar output aperture, thereby Get the same benefits as the new output hole design.

The output aperture does not have to be part of the dispenser. For example, the base can be formed as an insert which is inserted into the end of the roll; the roll and base can then be combined into a universal dispenser. It is also possible to modify existing dispensers by designing the base as a corresponding insert, or the base can be integrated with the dispenser itself.

If a conventional base and output holes are used, which are placed near one end of the roll and not inserted into the center of the roll, then the size of the output hole must be controlled according to the strength of the perforated portion and the size of the material to provide sufficient Friction to achieve burst. As a result, the sheet sometimes wrinkled, twisted into a rope or simply tore along its length. It has also been found that the new orifices, especially the frusto-conical ones, also expand the sheet to a certain extent, so that the sheets delivered by the new orifices do not form a "rope" like the conventional orifices.

The advantage of using a fabric with a higher perforation strength is that the requirements for the production process are less severe; since, as mentioned above, very low perforation strengths are difficult to achieve.

Another advantage of this form of output hole is that a groove is provided on the outside of the output hole, which is a suitable chamber for placing a sealing device, such as a resealable cover, when the present invention is used for This is useful when dispensing wet wipes. This seal prevents the wipe from drying out while ensuring that the next wipe to be dispensed is still moist.

The base can be made of any suitable material, such as metal, plastic or card.

According to a fourth aspect, the present invention provides a central output roll distribution system comprising:

a central output reel formed of at least one fabric with frangible threads which allow the fabric to be separated into sheets; and

A dispenser for supporting the roll and having a base thereon, the base is provided with a flange extending around an output aperture, the flange protruding into the central interior of the roll in use, the fabric is released from the roll The inner surface of the drum is output through the output hole, the strength of the fabric or the perforated part of each fabric is reasonably selected so that the fabric can be pulled from the center of the drum and break under the action of the resistance provided near or inside the output hole .

Embodiments of the invention will now be described, by way of example only, with reference to the accompanying drawings, in which:

Fig. 1 is the plane view of central output reel of the present invention;

Figure 2 is a perspective view of the central output reel of Figure 1 in use within a dispenser;

Figure 3A is a perspective view of a base suitable for use with the center take-out reel of the present invention in accordance with another aspect of the present invention;

Figure 3B shows the central output reel and base of the present invention in use;

Figure 4 shows a lifting device for processing the center output roll of the present invention.

Figure 1 shows a central delivery reel or drum 1 according to the invention. The roll has been unrolled slightly from its outer surface to show the misplaced perforation arrangement. It will be appreciated that in use the fabrics are delivered from the inner surface and that the fabrics on the outer surface will normally be secured to each other so that the roll cannot be unrolled as shown.

The roll comprises an inner fabric 2 and an outer fabric 3, each fabric having perforations 4 which allow individual sheets 5 to be detached from the fabric. A single sheet has a length X. The roll is made of paper and is suitable for use as a hand towel or other wipe.

As shown, the perforations are offset by a length Y, which is 50/50 in this embodiment.

Figure 2 shows the roll 1 in a dispenser 6 in use. For the sake of simplicity, only the outline of the dispenser is shown in the figure. The inner fabric 2 and the outer fabric 3 are output through the output hole 7 of the dispenser, and since the perforations are mutually staggered, the length of the slice 8 of the inner fabric 2 protruding from the dispenser is longer than that of the slice 9 of the outer fabric 3. longer. When a sheet is ready to be dispensed, the user will grasp the sheet 8 and pull it down until the friction between the inner fabric 2 and the flange of the output aperture 7 is across the perforated portion 10 . Afterwards, the sheet 8 is separated, leaving the end of the next sheet 11 of the inner fabric at the output aperture 7 . Just when the inner fabric was pulled, the outer fabric 3 was moved downwards at the same time because it was wound together with the inner fabric, and when the sheet 8 was separated, the sheet 9 had stretched out from the dispenser as shown in the figure The lamellae 8 protrude by the same length. Thus, the sheets can be provided separately from alternating fabrics.

The separation strength of the perforated part wire can be tested by the Kimberly-Clark European Standard Test Procedure No. KCN-60. The test uses an Instron universal test device to simulate the separation action between two adjacent sheets of the perforated part product. For a 200mm wide reel, the sheet is machine folded to one third of its original width and then placed in the 3 inch (76mm) collet of an Instron device before testing is performed superior. The jaws were initially separated by 102 ± 2 mm, after which the upper jaw was moved upwards and away from the lower jaw at a constant speed of 250 mm/min until the perforated portion broke. Thereby, the total energy (kg/mm), the maximum load (g), the highest percent elongation (%) and the total percent elongation (%) can be measured.

According to this method, the tensile strength of the material in the selected direction (usually the machine direction) can be measured using an unperforated portion of the sample. In fact, testing a 50mm wide sample, the test result is multiplied by 4 to get the tensile strength of a 200mm wide roll.

Figure 3A shows a base 12 according to another aspect of the invention. The base comprises an annular disc 13 having in the middle a flange 14 in the shape of a hollow frusto-cone. In use, as shown in Figure 3B, the base is placed near one end of the drum 1 with its flange inserted into the central cavity of the drum. The fabrics 2 and 3 pass through the outlet opening 14, the upper edge 15 of the flange is provided with an edge at which the perforated portion is gradually split along the width of the fabric.

Figure 4 shows an apparatus suitable for processing the center delivery rolls of the present invention. The two rolls of substrate 16 in the unrolled state provide the inner fabric 17 and the outer fabric 18, which are then fed together into a single perforated section machine 19 where the two fabrics are simultaneously perforated 20. In order to give the necessary misalignment of the fabric before winding the central output roll, the outer fabric 18 is moved a longer distance than the inner fabric 17 by additionally passing around a roller 21 . The position of the rollers can be adjusted in the direction perpendicular to the conveying direction of the fabric so as to adjust the degree of misalignment according to different products. Once the perforations are offset, the two fabrics are rolled onto roll 22.

Claims (30)

1. central feed roll that forms by two fabrics, each fabric all has can make fabric be divided into the easy broken string of several slices, and the easy broken string mutual dislocation of the easy broken string of a fabric and another fabric is so that in use can distribute thin slice one by one from the fabric that replaces.

2. central feed roll as claimed in claim 1 is characterized in that: separate the required power of a thin slice less than about 3000g from described fabric.

3. central feed roll as claimed in claim 1 is characterized in that: separate the required power of a thin slice less than about 800g from described fabric.

4. the described central feed roll of arbitrary as described above claim, it is characterized in that: described easy broken string is made into the form of perforation.

5. central feed roll as claimed in claim 4 is characterized in that: the width of described perforation is greater than 1mm.

6. as claim 4 or 5 described central feed rolls, it is characterized in that: described connection ratio is about 1: 5 or is littler.

7. as claim 4 or 5 described central feed rolls, it is characterized in that: connect than being about 1: 10 or littler.

8. as claim 4 or 5 described central feed rolls, it is characterized in that: connect than being about 1: 20 or littler.

9. as claim 4 or 5 described central feed rolls, it is characterized in that: connect than being about 1: 30 or littler.

10. as the described central feed roll in arbitrary top in the claim 4 to 9, it is characterized in that: each fabric has on every 10cm reel width and is less than 15 perforation approximately.

11. as the described central feed roll in arbitrary top in the claim 4 to 9, it is characterized in that: each fabric has on every 10cm reel width and is less than 10 perforation approximately.

12. as the described central feed roll in arbitrary top in the claim 4 to 9, it is characterized in that: each fabric has on every 10cm reel width and is less than 5 perforation approximately.

13. the described central feed roll of arbitrary as described above claim is characterized in that: the ratio of the intensity of described easy broken string and the hot strength of described fabric is approximately less than 1: 5.

14. the described central feed roll of arbitrary as described above claim is characterized in that: the dislocation ratio of the perforated portion of the perforated portion of a fabric and another fabric is approximately less than 70/30.

15. the described central feed roll of arbitrary as described above claim is characterized in that: described dislocation ratio is approximately less than 60/40.

16. the described central feed roll of arbitrary as described above claim is characterized in that: described dislocation ratio is about 50/50, the amount exposed of each thin slice just equals the amount of exposing of a last and back thin slice like this.

17. the described central feed roll of arbitrary as described above claim, it is characterized in that: described fabric is made of paper, adhesive-bonded fabric or film.

18. a central feed roll distribution system comprises:

A central feed roll that forms by two fabrics, each fabric all has can make fabric be separated into the easy broken string of several slices, and the easy broken string mutual dislocation of the easy broken string of a fabric and another fabric is so that in use can distribute thin slice one by one from the fabric that replaces; With

One is used to the distributor that supports reel and have a delivery outlet, described fabric can pass delivery outlet from the inner surface of described reel, the intensity of the perforated portion on each fabric by choose reasonable so that make fabric can be extracted from reel central authorities and rupture near the delivery outlet or under the effect of the inner resistance that provides.

19. central feed roll distribution system as claimed in claim 18, it is characterized in that: the axis of described reel is vertical.

20. central feed roll distribution system as claimed in claim 19 is characterized in that: described fabric distributes from the bottom of described reel.

21. one kind is used for the pedestal that together uses with a central feed roll, this central authorities' feed roll is formed by one or more fabrics, each fabric all has can make fabric be separated into the easy broken string of several slices, wherein, this pedestal is provided with a flange, this flange extends around a delivery outlet, and this flange in use protrudes in the described reel central authorities, thereby fabric can pass described delivery outlet from the inner surface of reel.

22. pedestal as claimed in claim 21 is characterized in that: the cross section of described flange is annular.

23. pedestal as claimed in claim 21 is characterized in that: described flange is a frustum of a cone, and the narrower part of this circular cone is away from this pedestal.

24. as claim 21,22 or 23 described pedestals, it is characterized in that: described central feed roll is formed by two fabrics, and the easy broken string dislocation of the easy broken string of a fabric and another fabric is so that in use can distribute thin slice one by one through described delivery outlet from the fabric that replaces.

25. as the described pedestal in arbitrary top in the claim 21 to 24, it is characterized in that: this pedestal is made into an insert that inserts in the reel ends.

26. as the described pedestal in arbitrary top in the claim 21 to 25, it is characterized in that: this pedestal is set to an insert that improves existing distributor.

27. as the described pedestal in arbitrary top in the claim 21 to 26, it is characterized in that: this pedestal is made by plastics or cambric paper.

28. one kind comprises the distributor as the described pedestal in arbitrary top in the claim 21 to 27.

29. a central feed roll distribution system comprises:

One has the central feed roll that the fabric of easy broken string forms by at least one, and easily broken string can make fabric be separated into several slices; With

A distributor that is used to support described reel and has a pedestal on it, pedestal is provided with a flange that extends around a delivery outlet, this flange protrudes in the described reel central authorities in use, fabric or each fabric pass described delivery outlet from the inner surface of described reel, the intensity of the perforated portion on described fabric or each fabric by choose reasonable so that make fabric can pull out from the central authorities of described reel and rupture near the described delivery outlet or under the effect of the inner resistance that provides.

30. central feed roll distribution system as claimed in claim 29 is characterized in that: described central feed roll is the described central feed roll in arbitrary top in the claim 1 to 18.

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