JPH06503794A - Core with selective weak points for core wrapped paper products - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Core with selective weak points for core wrapped paper products 〔Technical field〕 The present invention relates to cores for core-wound products, and in particular to flattened cores to minimize wasted space. Re-rounding the wick to near its original shape, especially for wicks that have been compressed or compressed. It relates to a flat core having means for.

[Background technology]

Core paper products such as toilet tissue and paper towels are well known and It is a very useful consumable item. Such products have a layer of paper product wrapped around them. It has a core that can be This core is used to store paper products temporarily for convenience. A scrubber is used to remove the product from the core and, if required, from the roll scale. Often inserted above the spindle. This spindle is inserted through the center of the core. The spindle can therefore create excessive friction and later difficult distribution of the desired paper product. It is necessary to open the wick so that it fits snugly without twisting.

The preferred core shape is such that the core (and the paper product wound on it) is aligned with the axis of the spindle. The cross section is circular so that it can rotate freely around the paper product and remove it from the roll into the container. It has a cylindrical shape. One of the improvements to rolls of core-wrapped paper products is to eliminate wasteful empty spaces in the core. To reduce the spacing, the core may be compressed in a direction perpendicular to the axis of the core. child This allows core-wrapped paper products to be stored and transported very economically and with high density. , convenient for storage, handling and transportation of the product.

Several improvements have been attempted in compressed core paper products. For example, Publication No. 4762061 (issued on August 9, 1988, invention by Mr. Watanabe et al.) and U.S. Patent No. 4909388 (issued March 20, 1990, invented by Mr. Watanabe) discloses rolls of paper products compressed to 1/2 to 115 of the original diameter of the paper product. Ru. The core of these products compresses it from its flat shape and returns it to its original cylindrical shape. A slight elasticity is provided to make this possible. Generally this It is hoped that flat rolls can be easily returned to their original shape based on these patents. .

U.S. Patent No. 1005787 (issued October 1911, invented by Mr. 5ibley) ) is wound onto a hollow core made of flexible, axially corrugated paper stock. A flat attached toilet vapor pack is disclosed. Its corrugated core is woven It holds the object and creates an oscillating motion when the paper is removed from the roll. Europe Patent No. 709363 (published on May 19, 1954, invented by Mr. 5aIIson) ) is flattened diametrically and when the roll is consumed it gives its tubular shape to the container. discloses sheet paper or sheet material rolled onto a core such that it is returned to . Its core consists of a spirally wound strip of kraft sheet material that is flexible and ing. Its flexibility allows the core to be flattened without cracking. , it is possible to return to the cylindrical shape later after flattening.

U.S. Patent No. 4,886,167 (issued December 12, 1989, Dearve ster invention) is illustrated between diametrically opposed surfaces of a cross-sectionally flat core. One-sided compressed toilet tissue with a flat core that eliminates wasted space. Disclosed. This patent applies to compressed toilet tissue and paper towels. It has been embodied in relation to the purpose of providing a compact and particularly advantageous roll. Ru.

The method described above often creates diametrically opposed folds when rounding the core. The disadvantage is that it occurs over the core metal body and prevents it from forming the desired cylindrical shape. There is. The creases often cause the core to misalign with the spindle. , which allows the wick to be inserted onto the spindle during use or when the spindle is inserted. This causes inconvenience to the user when taking the product out of the container. Furthermore, such a core Non-circular cross-sections prevent easy removal of the paper product from the roll residue. This also makes it desirable to remove sheets or long sections from paper products. This makes the user feel inconvenienced when the device is turned off. A core with a non-circular cross section can be Makes a lot of noise.

In order to solve the problem of core flattening, we propose a method to maintain the original shape of the core. U.S. Patent No. 2,659,543 (issued November 17, 1953, cuye Attempts have been made to prevent such flattening, as disclosed in It is. This patent states that the wicks are arranged along the outer surface of the core at uniform intervals around its circumference. tape product having at least one axially extending groove or slot A wick for use is disclosed. If the material is tightly wound onto the core, the grooves will be slightly corroded. compression hoop response caused by wrapping the tape tightly around the core. relieve force. However, this method maintains the circular cross section of the core and produces a flat core as described above. This has the disadvantage that the advantages of

Therefore, the compressive force applied to the paper product is removed, although it is flattened as is known in the art. It is necessary to have a core that can be easily and precisely rounded even after being rolled.

The object of the invention is to provide means for flattening and rounding the core in a manner convenient for the user. The object of the present invention is to provide a core that can be accurately repeated to form a shape close to its original shape.

[Summary of the invention]

The present invention relates to a flat core onto which a core-wrapped paper product is wound in the form of a paper product roll. Ru. This flat core has an inner circumferential surface, an outer circumferential surface, and opposite ends defining a longitudinal axis. Ru.

When a flat core is rounded, its cross section can be made almost circular. The core also responds to the applied compressive force. and at least one axially extending means for reducing the resistance of the core. . Is this weak point means located on at least one of the circumferential surface or the outer circumferential surface? , or communicates with the circumferential surface and the outer circumferential surface through the entire thickness of the core. .

In a first embodiment, the weak point means is a plurality of score lines extending continuously in the axial direction. It consists of In a second embodiment, the weakening means comprises a plurality of axially extending perforations. It consists of a number of eyes. In a third embodiment, the weakness means extends in a plurality of axes. It consists of a hole. The score line, perforation, or hole should be made only on one side of the circumferential surface of the core. Is it blind to be affected by the weak point means or the inner peripheral surface of the core It extends through the entire thickness of the core to provide communication between the core and the outer circumferential surface.

[Brief explanation of the drawing]

The specification concludes with the claims particularly pointing out and distinctly claiming the invention, but with reference to the accompanying drawings. The invention can be better understood from the following description with reference to planes. The same applies to each drawing. Some parts are given the same reference numerals.

FIG. 1 is a perspective view of a flat core and paper product according to the invention; Figure 2 shows a plurality of axially extending score lines arranged on the inner and outer peripheries of the core. a perspective view of a core according to the invention before flattening; Figure 3 shows the present invention with five circumferentially spaced and axially offset holes. A schematic development diagram of the core based on light, Figure 4 is a circle that goes inward from both ends of the core. a schematic development of a core according to the invention with five circumferentially spaced holes; Figure 5 shows that five lines consisting of notches and lands of the same size are located at one point from both ends of the core. a schematic exploded view of a core according to the invention extending to the inside of an inch; Figure 6 shows that five lines consisting of notches and lands of the same size are half the thickness of the core. a schematic development view of the core according to the invention, which is only incised up to Figure 7 shows five perforations where the length of the notch is 1/3 of the length of the land. A schematic development diagram of a core based on the present invention, Figure 8 shows the invention with five score lines ending before reaching both ends of the core. The schematic development diagram of the core based on FIG. 9 is better than the embodiment shown in FIGS. 6 or 7. Schematic development of a core according to the invention with five lines consisting of long cuts and lands figure, Fig. 10 shows a notch part and a land part having the same dimensions, which are shorter than the embodiment shown in the above drawings. a schematic development of a core according to the invention with five lines consisting of; FIG. 11 shows a core according to the invention running with alternately spaced cuts; FIG.

[Detailed description of the invention]

As shown in Figure 1, the "core" here refers to a hollow tube member, and a separate The components are wound into a spiral, which is later dispensed and removed. here "Paper products" are cellulose-based products wound on a core 20, typically Batch-wise, that is, one or several sheets are removed and used at a time, and the final be thrown away. The used paper product 24 removed from the core 20 is not returned. child Here, a "roll" is an aggregate of a "core" and a "paper product" wound on it. B The roll 28 has a wrapper 32 to maintain the shape shown in FIG.

The core 20 according to the invention is advantageous for toilet tissue or paper towels. used. The core 20 has a cylindrical shape before being compressed and flattened, and its ends are It has an axial length defined by . Both ends of the core 20 have a cross section before being flattened. It has a circular shape. The line connecting the centers of these circles is the "longitudinal axis" of core 20 . Here, the "axial direction" refers to the "longitudinal axis".

Toilet tissue is made by wrapping toilet tissue around a core 20. The roll 28 has a diameter of about 12 to about 17 cm (00 to 00 inches), and has both sides. The length from end to end is approximately 14 cm (50 inches). The core 20 according to the invention When used for paper towels, the paper towel roll 28 has a diameter of approximately 12 mm. ~ approximately 12 cm (00 to 00 inches), and the length between both ends is approximately 29 cm ( 10 inches).

Typical cores 20 include bleached kraft paper, sulfide paper, hardwood paper, softwood paper and It is made of two layers of recycled paper. Core 20 has no weak points It must have uniform strength. Preferably the core 2o is It is not polished to hold the adhesive that is applied on it. Core 20 is At least 6 o preferably less than Must have a sullen strength of at least 70. Must be. Core 20 has a thickness of approximately 5 mm (0.20 inches). core 20 must not contain unpleasant odors or impurities or dirt that may damage the skin. stomach.

The core 20 has a basic weight when measured based on Tatsupi standard T8180M--87. is approximately 16 kg/m2 (032 lb/ft2), and the ring crushing strength is low. At least 79 kg/cm (38 lb/in) preferably at least 93 kg /cm (50 bonds/inch).

The core 20 according to the invention resists compressive forces, especially compressive forces applied diametrically oppositely. at least one means 36 for selectively weakening the resistance of the wick 20. straight The radially opposed compressive forces can be applied along any point of the core 20 or along the entire axis. arises through

Here, "compressive force applied diametrically opposite" refers to the diameter line of the cross section of the core 20. This is the compressive force applied from both ends at the top. Do not match the compressive force with the diameter of the cross section Of course, it is also conceivable to apply it along the string. However, the supply of such compressive force The principles involved are substantially similar to these diametrically opposed compressive forces. It cannot be further differentiated or repeated.

The core 20 is crushed into the flat shape of FIG. 1 when compressive force is applied. Figure 1 flat surface The cross section of the core 20 has a long axis a-a and a short axis i-1 perpendicular thereto. cross section The long axis a-a and the short axis i-1 are the horizontal and vertical axes of the core 20. Paper product 24 is flat When flattened, the long axis a-a is aligned with the longest dimension of its cross section and the short axis i-a 1 is the perpendicular bisector for this.

The means 36 for reducing the resistance of the core 20 to compressive forces are arranged at least once in the circumferential direction. I know that I need to have one. Preferably, it is not necessary to do so. However, when making the core 20 round, it is necessary to make the cross section closer to a circle than an irregular polygon. In order to reduce the resistance of the core 20 to compressive forces, each means 36 reduces the resistance of the core 20 to compressive forces. provided at uniform intervals in the circumferential direction from the adjacent means 36 for weakening the resistance of o. Ru.

The azimuthal direction of the long axis a-a and the short axis l-1 of the flat core 20 is defined by the circumferential arrangement and spacing of the means 36 for weakening the resistance of Ru.

The core 20 has two diametrically opposed means 36 for reducing the resistance of the core 20 to compressive forces. When provided at a location and the diameter applied along or along the compressive force at an angle of approximately 90'' to the means 36 for reducing the resistance of the core 20 to the , the wick 20 is generally provided with two means 36 to reduce the resistance of the wick 20 to compressive forces. It will become flat.

The flattened core 20 has a long axis a-a with two vertices, the vertices being At each end of the longitudinal axis a-a correspond to means 36 for weakening the resistance of the core 20 to compressive forces. It is well located. Preferably, therefore, each means for reducing the resistance of the core 20 to compressive forces is 36 is diametrical to another means 36 for selectively weakening the resistance of the core 20 to compressive forces. means 36 for weakening the resistance of the core 20 to compressive forces so as to be linearly opposed; are set in even numbers.

When the core 20 is rounded, the two vertices of the core 20 make the cross section of the core 20 somewhat double convex. In order to shape it, it does not become its almost cylindrical original shape. To get additional vertices, Means 36 for weakening the resistance of the core 20 in the pressure line may additionally be arranged circumferentially. be. When making the core 20 round, it is a polygonal cross section whose number of sides corresponds to the number of vertices. , each vertex of which corresponds to an individual vertex 36 that reduces the resistance of the core 20 to compressive forces. I am responding.

Note that at least one and a majority of the components for reducing the resistance of the core 20 to compressive force The two means 36 are not suitable for producing a double convex shape when attempting to round. do not have.

When four means 36 are provided for weakening the resistance of the core 20 to compressive forces, the core 20 0 is rounded to a square cross section and becomes a hollow hexahedron. Try to make the core 20 round. causes excessive wobbling and noise on the spindle and is therefore generally undesirable. stomach.

A core 20 having six means 36 for reducing the resistance of the core 20 to compressive forces is useful. It is. The means 36 for reducing the resistance of the core 20 to its compressive force are mutually circumferential. They are equally spaced in the direction (in approximately 60° increments or multiples thereof). pressure Two means 36 for reducing the resistance of the core 20 to shrinkage forces include flattening the core 20. It exists at both ends of its long axis a-a. Weakening the resistance of the core 20 to compressive forces The other two means 36 for the purpose of of the core 20 against the compressive force on the opposite side of the flattened core 20. It is juxtaposed with two further means 36 for weakening the resistance. This core 20 has a cross section It is rounded into a hexagonal shape and does not wobble and does not make noise when dispensing the appropriate amount. do not have.

8, 10 or 1 means 36 for reducing the resistance of the core 20 to compressive forces; Having two cores 20 is not desirable since they have a tendency to deform into a quadrilateral cross section. Not good. Furthermore, this structure requires rounding in two stages, making it difficult to use.

2, to selectively reduce the resistance of the core 20 to compressive forces. A particularly advantageous means 36 for this purpose is a continuous axially extending score line. Cut line preferably extends parallel to the axis of the core 20 and, if desired, extends the core 20 in a helical shape. It can be wrapped in The means 36 for reducing the resistance of the core 20 to compressive forces are If the line passing through step 36 forms an angle of less than ±45° with respect to the longitudinal axis of core 20, In some cases, the term "extends in the axial direction".

The score lines are arranged on the inner or outer periphery of the core 20. Multiple cut lines are provided. When used, the majority is distributed between the inner and outer circumferences of the core 20.

Here, the term "score line" includes a line caused by compression, and preferably a line formed by removing material from the core 20. It is a line defined by Use a cutting ruler or rotary knife to mark the cutting line. preferably up to about 2596 mm for 100% thickness of the core 20 It's cut in. The score line preferably extends between and to the ends of the core 20. Ru.

If necessary, such as a score line to reduce the resistance of the core 20 to compressive forces. The means 36 may extend continuously, discontinuously or intermittently, and may include discrete holes or perforations. It resembles an eye. Discontinuous holes or perforations are not necessarily required or may be provided on both sides of the core 20. It extends towards the end and terminates just short of the end of the core 20.

For example, eight embodiments are possible, as shown in FIGS. 3 to 10. child These figures show various means 36 for reducing the resistance of the core 20 to compressive forces. has been done. The samples in the valley example are shown in Table 1, and the core is rounded. The parameters used for this are listed in Table 1 and can be easily compared.

Each row in Table 1 is from Proctcr & Gal, Cincinnati, Ohio. Commercially available useful product name manufactured and sold by lIb1e Company>t It represents a sample prepared with "n" toilet tissue. Core 20 is made of paper The product 24 is removed from the roll 28 and the core 20 is The above-described means 36 are provided, and the center of the paper product 24 is provided to complete the roll 28. I put it back in. Each roll 28 of paper product 24 then has approximately 3 Diametrically opposed compression was performed with a force of 6 kg (80 lb).

and roll paper product 24 for two weeks at approximately 50% relative humidity and 72°F. Time has passed. A minimum of 2 weeks elapsed time should be approximated under storage and transportation conditions. A memory of 20 cores is used to ensure accurate data when the sample is later rounded. or may be necessary to allow elasticity to develop. Elapsed time of about 2 weeks or less is considered to be insufficient. This is how products are made, stored, and transported to retail stores. It is then sold, transported to the consumer's home, and finally attached to a spindle and used. This is because it does not approximate the time actually spent until the end of the process.

The 6-core 20 is made of the materials described above and has a length of approximately 143 cm (5 inches). There is. The samples shown in Figures 3 to 10 are designed to reduce the resistance of the core 20 to compressive force. is provided with six uniformly spaced means 36, i.e. one for opening the wick 20. two through-cuts, and to reduce the resistance of the core 20 to compressive forces, as described below. It is provided with five means 36 for this purpose.

The first column of Table 1 shows the above-mentioned means 36 for reducing the resistance of the core 20 to compressive forces. represents a plane figure. In the second column of Table 1, the resistance of the core 20 to compressive force is reduced. Five means 36 are described for achieving the desired results. But for these samples The wick 20 is slitted to selectively weaken the wick 20's resistance to compressive forces. In order to form the above-mentioned weak point means 36 for a total of six means 36, FIGS. It must be opened as shown in the plan view of FIG.

Yes, when the five weakness means 36 described above are utilized with one continuous through slit. At any time, the through slit is closed again with adhesive tape and the core 20 is flattened. When the long axis a-a coincides with the taped slit and one of the above-mentioned weak point means 36. It is compressed as follows. In fact, the above-mentioned through slits are used to reduce the resistance of the core 20 to compressive forces. As all six means 36 for weakening resistance have the same shape, the other replaced by means 36 for weakening the resistance of the core 2o to compressive forces similar to the five It will be done.

The percentage of the perforated area or cut area listed in the third column of Table 1 is the compressive force. the axial linear dimension influenced by the means 36 for weakening the resistance of the core 20 to It is the proportion of law. 6-core 20 is approximately 6 8 cm (21 inches) (6 iX 5 inches) H) has a total wheel direction dimension.

In the fourth column, the weak point means 36 is shown over the entire length of the core 20 from one end to the other in the direction of the longitudinal axis. Extending all the way through the length, centered and not reaching the ends, or indicates that they start from both ends or do not meet in the center.

The apex-forming action of the weak point means 36 in column 5 of Table I defines the core 20 in its original cylindrical shape. Low “L”, medium rMJ or It was determined that the rHJ was high. Samples with no clear apex observed when rounded are It was judged that the point-forming effect was low. change in the direction of curvature at one or more vertices It was judged that the sample in which the formation appeared was moderate in the apex formation effect. Core against compressive force The sample formed by the apex in the means 36 for weakening the resistance of 20 is apex-shaped. It was judged that the production effect was high.

The sample in Figure 3 has five holes approximately 4 mm (25 inches) in diameter. . The six holes are each about one-fifth of the length of the core 20 with respect to the circumferentially adjacent holes. axially displaced.

The sample in Figure 4 has 10 holes approximately 4 mm (25 inches) in diameter in the circumferential direction. are provided at intervals from each other, and five of them are arranged at each end of the core 20. It is provided. The five holes at each end are in a common plane and the core 20 It extends approximately 1 inch inward from the edge of the five at both ends of the core 20 Each hole is axially aligned with the five holes at the opposite end of the core 20. It is.

The sample in Fig. 5 has a length of 1 mm (04 inch) from both ends of the core 20 toward the center. The cut portion 40 of 1 mm (inch) and the land portion 44 of 1 mm (04 inch) continue alternately. It is marked with a thin line. The perforations are approximately 54cm inward from both ends of the core 20. (1 inch) extended.

The sample in Figure 6 has a notch 40 of 1 mm (04 inch) and a cut of 1 mm (04 inch). The land portions 44 of (h) are provided with alternating perforations. The notch 4 0 is made by penetrating half of the thickness of the core 20 from its inner peripheral surface. In Figure 6 The ratio of the effective area is set so that the perforations only act on half of the total thickness of the core 20. It has been cut in half to make it.

The sample in Figure 7 has a 2mm (08 inch) notch 40 and a 6mm (24 inch) notch. The land portions 44 of (h) are provided with alternating perforation openings. Notch part 40 and lands 44 alternately extend over the entire length of the core 20.

The sample in Figure 8 has a double notch 40 approximately 54 cm (0 inch) in length. It is growing. These notches 40 are 27 cm (27 cm) inward from both ends in the axial direction. 5 inches).

The sample in Figure 9 has a notch 40 of 1 mm (C34 inch) and a cut of 1 mm (04 inch). Perforations are provided in which the land portions 44 of the grooves (inches) are alternately continuous. that perforation extends from one end of the core 20 to the other end.

The sample in Figure 11 has a notch 40 of 3 mm (12 inches) and a cut of 1 mm ( 04 inch) land portions 44 are provided with alternating perforations. That Mi The thin line extends from one end of the core 20 to the other end.

There are five Extends by an inch double notch Department As can be seen from Table I, the means 36 for reducing the resistance of the core 20 to compressive forces Therefore, for samples whose axial dimension is affected by less than about 20%, the apex formation effect is judged to be low. By means 36 for reducing the resistance of the core 20 to compressive forces. If the percentage of affected perforation or notch area is between 20% and 45%, other The apex formation effect was judged to be moderate for the sample. Resistance of core 20 to compressive forces The division of the perforation or incision area affected by the means 36 for weakening the When the ratio was 50% or more, the apex forming effect was judged to be high. However, all The sample is placed on the spindle and the appropriate amount ν is fed 1. ? -Obeah's 7th Go +LZ-)/Dingyoju? 1 unit - 1 + 1 song 0 convex Fig, 1 Fig, 11 international search report AN)-I AN3 ANNE:X ANNEXE front page continuation (81) Designated countries EP (AT, BE, CH, DE.

DK, ES, FR, GB, GR, IT, LU, MC, NL, SE), 0A (BF , BJ, CF, CG, CI, CM, GA, GN, ML, MR, SN, TD, TG. ), AT, AU, BB, BG, BR, CA, CH, C3, DE.

DK, ES, FI, GB, HU, JP, KP, KR, LK, LU, MG, MN, MW, NL, No, PL, RO, SD, SE, 5U (72) Inventor Swanson, James Lee, Ohio, USA Nshinachi, Andalusia, Crows, 10152

Claims (10)

[Claims] 1. It has an inner circumferential surface, an outer circumferential surface, and both ends defining a longitudinal axis, and has a nearly circular cross section. In a flat core onto which a paper product such as that which can be It extends axially to weaken the core's resistance to compressive forces supplied in its radial direction. means is provided, the weak point means being located at least on the inner circumferential surface and the outer circumferential surface of the flat core. A flat wick located on one side and characterized by a local reduction in the thickness of the wick. 2. It has an inner circumferential surface, an outer circumferential surface, and both ends defining a longitudinal axis, and has a nearly circular cross section. In a flat core onto which a paper product such as that which can be It extends axially to weaken the core's resistance to compressive forces supplied in its radial direction. means are provided, the weakening means extending axially on one side of the flat core. Flat, characterized by being made up of multiple perforations. 3. It has an inner circumferential surface, an outer circumferential surface, and both ends defining the longitudinal axis, and has a nearly circular cross section. In a flat core onto which a paper product such as that which can be It extends axially to weaken the core's resistance to compressive forces supplied in its radial direction. means is provided, the weak point means being located at least on the inner circumferential surface and the outer circumferential surface of the flat core. consisting of at least one axially extending score line disposed along one side; A flat core characterized by 4. The weakening means comprises a plurality of holes distributed in a plurality of axially extending lines. 2. A flat core according to claim 1, characterized in that: 5. It is noted that the score line is arranged almost continuously along the outer surface of the flat core. 4. A flat core according to claim 3, characterized in that it is characterized by: 6. that the weak point means extends at an angle of 0° to 45° from the longitudinal axis of the core; A flat core according to any one of claims 1 to 3, characterized in that: 7. A claim characterized in that the weakness means extend substantially parallel to the longitudinal axis of the core. A flat core according to item 6. 8. Ensure that the weak point means is located midway between the ends of the flat core and does not coincide with the ends of the flat core. A flat core according to any one of claims 1 to 3, characterized in that . 9. Each of the plurality of score lines extends circumferentially around the longitudinal axis when the core is rounded to have a circular cross section. Claims 1 to 3 are characterized in that they are spaced at approximately equal intervals in the direction. A flat core according to any one of paragraphs. 10. The flat surface according to claim 9, characterized in that the number of score lines is six. Core.