MXPA98004660A - Block that includes adhered leaves coadhesivame - Google Patents

Abstract

The present invention relates to a block, characterized in that it comprises: a plurality of flexible and unfolded sheets, each having a first and second main surfaces extending between opposite edges, the sheets are placed surface on the surface in the stack, and block forming means for releasably adhering portions of the main surfaces of adjacent sheets in the stack just to keep the sheets in the stack, the block forming means comprise at least some of the sheets having coadhesive patterns coated on top. main surfaces of adjacent edges, the coadhesive patterns adhere to coadhesive patterns on adjacent sheets in the stack and releasably adhere parts of the main surfaces of adjacent sheets in the stack together, in a surface-to-surface relationship until the patterns of Coadhesive are separated by detachment

Description

- i - BLOCK THAT INCLUDES SHEETS ADHERED COADHESIVELY TECHNICAL FIELD The present invention relates to blocks (tacos or reams) of flexible sheets and with methods for manufacturing such blocks of sheet material.

ANTECEDENTS OF THE TECHNIQUE Blocks of flexible paper sheets, sometimes called a notepad or script pad, have been available for a long time in various sizes, with varying numbers of sheets, and in different configurations that include rectangular shapes and other peripheral shapes. The sheets in such blocks, optionally, may be printed with signs that include lines, images or various written information which may include, for example, the names of persons, companies or corporations, or which may provide a form that can be used by a person or a business (for example, a form that can be filled out to notify a person of a phone call, or a form that can be filled to order a product or to introduce a drawing). REF: 27585 Such blocks are often manufactured by forming large master sheets that are printed or unprinted, assembling the master sheets together in a master block with a rigid support sheet in the lowermost sheet, cutting a plurality of blocks of a size desired from a master block by the use of a cutter or die, and then applying a block-forming compound (e.g., water or a block-forming compound based on water or an organic solvent, or a forming compound). adhesive block that melts by heat) along the edge surfaces of the blocks. Subsequently, individual sheets can be removed from the upper part of the blocks by detaching them away from the block-forming compound. In some such blocks (typically with a large number of sheets that form a block generally in the form of a cube) graphics are printed, for purposes such as advertising or decoration along the exposed edges of the sheets in the block and at length of the block-forming compound that holds the sheets together in the block. Such an impression will have a different appearance along the block forming compound compared to the appearance along the edges of the sheets, which may be undesirable.

Blocks of flexible paper sheets that have strips of pressure sensitive adhesive on the main surfaces adjacent to the edges of the sheets that adhere together the sheets in blocks have been available for some time under the trade name "Post-it" (Trademark) of Minnesota Mining notes Manufacturing Company, St. Paul, Minnesota. Such blocks are available with the bands of pressure-sensitive adhesive removable along the edges of the sheets placed on a side surface of the stack. Additionally, such blocks are available with the band of pressure sensitive adhesive on each successive sheet in the block along an opposite side surface of the block, as described in U.S. Patent No. 4,781,306 (Smith). This last block structure facilitates the supply of block sheets such as dispensers of the types described in U.S. Patents 4,781,306 (Smith), 4,653,666 (Mertens), and 5,080,255 (Windorski). Blocks of any of these types may have graphics printed on the edges of the sheets along their entire side surfaces and those graphics may have a similar appearance on all sides of the block. However, providing the band of pressure sensitive adhesive in the sheets in such a block adds cost to the block, and for some purposes, this band of pressure sensitive adhesive in the sheets removed from the block is not needed or can even be undesirable.

DESCRIPTION OF THE INVENTION The present invention provides a block of flexible sheets (for example paper or polymeric sheets), which, like prior art blocks described above that are formed using a block-forming compound, are inexpensive to process and can have Leaves removed from it that do not have bands of adhesive that will adhere to most common surfaces; but which, unlike those of the prior art blocks, can be printed, if desired, on all sides of the stack to provide a uniform appearance for those sides, and can also be adapted to be supplied from dispensers of the types described in U.S. Patent Nos. 4,781,306 (Smith), 4,653,666 (Mertens), and 5,080,255 (Windorski). In accordance with the present invention, there is provided a block including a stack of flexible sheets, and block forming means for releasably adhering portions of the main surfaces of adjacent sheets together in the stack until the sheets are separated by peeling off the block . The block forming means comprises at least part of the sheets having coadhesive coating patterns on their major surfaces and adhering to coadhesive patterns on adjacent sheets in the stack to releasably adhere parts of the major surfaces of those adjacent sheets together, in a surface to surface relationship until the coadhesive patterns are separated by detachment. The term "coadhesive" as used herein means an adhesive material, which when adhered in a thin layer to a major surface of a first sheet of paper or polymeric material and dried (1) will remain adhered to that surface, (2) will not adhere to contact with most other materials that include a person's fingers; (3) It will be releasably adhered to a thin layer of the same adhesive material on a main surface of a second substrate, and (4) it can be separated by detachment of that layer in the second substrate with most of the adhesive material in both sheets remaining on the main surface of the sheet to which they originally adhered. An example of such coadhesive material is the latex lateral adhesive available from H. B. Fuller, Co., St. Paul, Minnesota, under the trade designation # W-593. Therefore, although the coadhesive patterns can hold the sheets together in a block, those coadhesive patterns will not easily adhere to most other surfaces, so that the sheets will not adhere to most of the surfaces afterwards. that they have been detached from the block. However, those coadhesive patterns can re-adhere to other coadhesive patterns so that, if desired, the sheets of the block can be reattached to the block after they have been removed. The coadhesive patterns can be in many different forms including areas of adhesive in the central parts of the sheets which can have any shape such as circular, rectangular, etc., and which are particularly useful when applied as narrow strips or bands ( for example with a width of 2.4-13 mm (3/32 to 1/2 inches). Some or all of the sheets in the block that have sheets along both major surfaces can each have a first band of coadhesive on its first main surface and may have a second coadhesive strip on its second main surface, with both adjacent bands on the same edge.This may provide the most common form of block in which all the sheets are bonded to the block at along the same block surface Alternatively, some or all of the sheets in the block that have sheets along their main surfaces can each have a first coadhesive strip on one of its main surfaces adjacent to one edge, and may have a second strip of coadhesive on the other main surface adjacent to a second opposite edge. This can provide a block form of the type generally described in U.S. Patent No. 4,781,306 (Smith), block from which sheets can be removed serially when the block is in a dispenser of the types disclosed in U.S. Pat., 781, 306 (Smith), 4,653,666 (Mertens), and 5,080,255 (Windorski). Any type of block, according to the present invention has a plurality of lateral surfaces defined by the edges of the sheets. If there is a large number of sheets in the block, each of these side surfaces can have graphics printed on the edges of the sheets so that all of the side surfaces of the block can have a similar appearance, which, for example, it is desirable in a block in the form of a cube used for advertising purposes.

The block forming means in a block according to the present invention can also include some sheets having pressure sensitive adhesive in a band or other pattern on one of the major surfaces that releasably adheres parts of the main surfaces of adjacent sheets in the stack to keep the sheets together in the stack. For example, alternating pairs of adjacent sheets in the stack can be adhered together from the top to the bottom of the stack by two coadhesive webs and by a band of pressure sensitive adhesive, respectively. In this case: (1) those coadhesive bands and those bands of pressure sensitive adhesive may be along the edges of the same side of the stack which provides a more conventional block shape, or (2) those bands of coadhesive may be along the edges on opposite sides of the stack from those bands of pressure-sensitive adhesive which may allow the sheets of the block to be delivered through the jets described above.

SHORT DESCRIPTION OF THE DRAWING The present invention will be further described with reference to the accompanying drawings in which like reference numbers refer to like parts in the different views, and wherein: Figure 1 is a perspective view of a first embodiment of a block of sheets flexible according to the present invention; Figure 2 is a schematic, not to scale, very enlarged side view of a portion of the block of Figure 1; Figure 3 is a schematic side view of a second embodiment of a block according to the present invention; and Figure 4 is a schematic side view of a third embodiment of a block according to the present invention.

DETAILED DESCRIPTION Referring now to Figures 1 and 2 of the drawing, a first embodiment of a block of sheets according to the present invention is shown, generally referred to as the reference number 10. Generally, the block 10 comprises a plurality of non-flexible sheets 11. bent of the same size and peripheral shape (e.g., sheets of paper or polymeric material), each of which sheets 11 has first and second opposed major surfaces 12 and 13 extending between the first and second opposite edges 14 and 15 ( see figure 2). The sheets 11 are placed in a stack one on top of the other, with their peripheral edges aligned. Each of the sheets 11 may, optionally, present graphics 17 printed on either or both of its major surfaces 12 and 13. The block 10 includes block forming means for releasably adhering portions of the first and second major surfaces 12 and 13 of adjacent sheets 11 together in block 10 to hold the sheets 11 in the stack. These block forming means comprise each of the sheets 11 having a pattern of a first adhesive web 18a on its first upper surface 12 adjacent to its first edge 14, and a pattern on the second adhesive web 18b on its second edge. the main surface 13 adjacent its first edge 14. The sheets 11 are stacked with the adhesive strips 18a and 18b on each sheet 11 so that two other sheets 11 along their main surfaces 12 and 13 adhere to the strips 18a and 18b of coadhesive on adjacent sheets 11 in block 10 to releasably adhere portions of the first and second major surfaces 12 and 13 of adjacent sheets 11 together in block 10 and maintain sheets 11 in block 10. Bands 18a and 18b Adhered coadhesive boards on the sheets 11 retain the adjacent sheets 11 in a surface to surface relationship until the coadhesive webs 18a and 18b separate by peeling. The block 10, as illustrated, may also include a rigid bottom sheet 16 having a coadhesive web 18c adhered to the coadhesive web 18b on the bottommost sheet 11 in the stack, and optionally may have a special top sheet (not shown) having a coadhesive band bonded to the coadhesive web 18a on the uppermost sheet 11 adjacent to the stack. The block 10 generally has the shape of a cube (see Figure 1) and has a plurality of four lateral surfaces defined by the edges of the sheets 11. Each of these four side surfaces optionally, as illustrated, may be printed with a graph 19 on the edges of the sheets 11. Since the block forming means (as with other stacks described below) for block 10 is between sheets 11 in block 10 instead of being along of one of the side surfaces of block 10, those graphs 19 can have, if desired, a similar appearance on all side surfaces of block 10.

Referring now to Figure 3 of the drawing, a second embodiment of a block of sheets according to the present invention is shown, generally referred to as the reference number 20. Generally, the block 20 comprises a plurality of unfolded sheets 21 thereof. peripheral size and shape, each leaf 21 has first and second opposed major surfaces 22 and 23 extending between the first and second opposite edges 24 and 25. Optionally, each of the sheets 21 may have graphics 27 printed on either or both of its major surfaces 22 and 23. These sheets 21 are placed in a stack one on top of the other with their peripheral edges in alignment. The block 20 includes block forming means for releasably adhering portions of the first and second major surfaces 22 and 23 of adjacent sheets 21 together in the block 20 to hold the sheets 21 in the stack. The block formation means comprises each of the sheets 21 having a pattern or web 28a of coated coadhesive. on its first main surface 22 adjacent to its first edge 24, and having a pattern or band 28b of coadhesive on its second main surface 23 adjacent its second edge 25. The sheets 21 are stacked with the coats 28a and 28b of co-adhesive on the sheets 21 having the sheets 21 adjacent to the two of their main surfaces 22 and 23 adhered to the coadhesive strips 28a and 28b in the adjacent sheets 21 in the block 20 and the releasably adhering portions of the first and second surfaces 22 and 23 of adjacent sheets 21 together in block 20 to hold the sheets 21 in the stack. The bonded webs 28a and 28b of coadhesive on the sheets 21 retain the adjacent sheets 21 in a surface to surface relationship until the coadhesive webs 28a and 28b separate by peeling. The block 20, as illustrated, may also include a rigid lower sheet 26 having a coadhesive web 28c adhered to the coadhesive web 28b on the lowermost sheet 21 in the stack, and optionally may also have a special top sheet ( not shown) having a coadhesive band adhered to the adhesive web 18a on the adjacent uppermost sheet 21, in the stack. The positions of the portions of adjacent sheets 21 in block 20 that adhere together alternately between opposite sides of block 20 for successive pairs of sheets 21 in block 20. Therefore, block 20 is generally of the type described in U.S. Patent No. 4,781,306 (Smith) insofar as the sheets 21 of the block 20 can be removed in a sealed manner when the block 20 is in a dispenser of the types described in U.S. Patent Nos. 4,781,306 (Smith), 4,653,666 (U.S. Mertens) and 5,080,255 (indorski). Referring now to Figure 4 of the drawing, a third embodiment of a block according to the present invention generally designated by the reference number 30 is shown. Generally, the block 30 comprises a plurality of unfolded sheets 31a and 31b of the same peripheral size and shape, each sheet 31a and 31b having a first and second opposite major surfaces 32 and 33 extending between the first and second edges 34 and 35. opposites. Optionally, each of the sheets 31a or 31b may have graphics 37 printed on either or both of its major surfaces 32 and 33. The sheets 31a and 31b are placed one on top of the other, with their peripheral edges in alignment. The block 30 includes block forming means for releasably adhering portions of the first and second major surfaces 32 and 33 of adjacent sheets 31 a and 31 b together in the block 30 to hold the sheets 31 a and 31 b in the stack. This block forming means comprises each of the sheets 31a and 3ib having a pattern or band 38 of coadhesive on its first main surface 32 adjacent to its first edge 34. The sheets 31a and 31b alternating through the stack have, for each of the first alternating sheets 31a, a pattern or band 37 of pressure sensitive adhesive on its second main surface 33 adjacent its second edge 35, and for each of the second alternating sheets 31b, a coating 40 of releasing material on its second main surface 33 adjacent to its second edge 35. The sheets 31 are stacked with the adjacent sheet co-adhesive strips 38 that adhere together, and with the strip 37 of pressure sensitive adhesive adhered to the sheet. second alternating sheet 31b on the release material liner 40, whereby releasably adhere portions of the first and second major surfaces 32 and 33 of adjacent sheets 31 a and 31 b together in the stack 30 to maintain sheets 31 a and 31 b in the stack 30. The strips 38 adhered to coadhesive boards in the sheets 31a and 31b and the strips 37 of pressure sensitive adhesive adhered to the liners 40 of the material They retain the adjacent sheets 31a and 31b in a surface to surface relationship until the coadhesive webs 38 are separated by peeling or the strip 37 of pressure sensitive adhesive is peeled off. The block 30, as illustrated, also includes a rigid bottom sheet 36 to which the strip 37 of pressure sensitive adhesive is adhered on the adjacent sheet 31b, and optionally may have a special top sheet (not shown) adhered in a manner releasable and appropriate to the adjacent uppermost sheet 31 in the stack. The positions of the portions of the sheets 31a and 31b in the block 30 that adhere together alternately between opposite sides of the block 30 for pairs of successive sheets 31a and 31b in the block 30. Therefore, like the block 20, block 30 is generally of the type described in U.S. Patent No. 4,781,306 (Smith) in which sheets 31a and 31b of block 30 can be separated in series when block 30 is a spout of the types described in US Pat. Nos. . 4,781,306 (Smith), 4,653,666 (Mertens) and 5,080,255 (Windorski). A block (not illustrated) similar to block 30 can be manufactured wherein the alternating pairs of sheets in the stack are releasably adhered together by patterns or bands of coadhesive on adjacent sheets and by a band of pressure sensitive adhesive in which Coadhesive bands and bands of pressure-sensitive adhesive are along the edges of the sheets on the same side of the stack. The blocks, such as blocks 10, 20 and 30 described above, can be manufactured by: (1) coating both side surfaces of a web or length of sheet material with appropriate coadhesive standards (or coadhesive standards, adhesive sensitive to pressure and release material), which can be done using conventional strip coating equipment that provides a continuous layer or band of adhesive, or when printing patterns of the adhesive or release material on the sheet material using a flexographic press or offset which can provide a discontinuous layer of adhesive or release material; and (2) converting the length of the adhesive-coated sheet material into a plurality of blocks such as blocks 10, 20 or 30, in which portions of the coadhesive or coadhesive coating and the pressure-sensitive adhesive relocatable thereon. The sheets are releasably adhered together in the blocks. This conversion step for making the blocks can be carried out by cutting the length of sheet material coated with moving adhesive into master sheets of a predetermined size; the. which causes the freshly cut master sheets to fall on a stack of master sheets to form a master block while displacing the master sheet to place the edges in alignment with the edges of other master sheets in the master block; and subsequently cutting the master block into individual blocks (such as blocks 10, 20 or 30) using a cutting or die cutting device. The method described above for making the blocks may further include providing any of: (a) a printing press having printed plates adapted to print signs along the length of the sheet material as it passes through the press, or ( b) a digital electronic printing mechanism adapted to print variable signs infinitely along the length of the sheet material as it passes through the printing mechanism in response to a series of digital electronic signals to the printing mechanism; and printing signs on one or both surfaces of the sheets in the blocks by passing the movement length of the sheet material, either (a) through the printing press, or (b) through a mechanism of printing while sending a series of digital electronic signals to the printing mechanism so that the printing mechanism will print various signs on either or both of the side surfaces of the length of the sheet material. Such an impression of the length of the sheet material can be made either before or after it has been coated with adhesive.

The method described above for the adhesive coating and the printing of moving sheet material, the cutting of the master sheets, the elaboration of the master blocks and subsequently the cutting of the master blocks into individual blocks are generally the same as those used for elaborate blocks described in the application for North American patent No. 08 / 285,882 filed on August 4, 1994 and PCT international publication No. WO 94/14614 filed on June 7, 1994, except that those layers of coadhesive are applied in both major surfaces of at least some of the sheets and in patterns that necessarily provide the coadhesive bands in the sheets in blocks 10, 20 and 30 described above. As a specific example, blocks similar to block 10 have been manufactured, each having 50 sheets, when applying to a moving length of paper sheet material, a thin continuous layer or strip of natural latex or "fugitive" sensitive adhesive available commercially from HB Fuller Co., St. Paul, Minnesota, as # W0593. This band is approximately 0.24 centimeters (3/32 inches) in width and is applied after the length of the paper sheet has been printed with signs on a flexographic network press. The master sheets are cut from the end of the length of adhesive-coated sheet materials and printed in motion by a press laminate, and then stacked with master sheets previously cut to form a master block by a device similar to that described in U.S. Patent No. 4,102,253 so that the edges of the master sheets are aligned with a master stack of 0.015. The master block is then removed and cut into individual blocks in a guillotine cutter device that applies 315 kg / cm (2000 pounds per inch) by holding pressure to the portion of the master block that is cut, with the cut bisecting longitudinally the adhesive strips so that the bands approximately 0.12 centimeters wide (3/64 inches wide) adhere the sheets in individual blocks together. These coadhesive bands keep the sheets in place during normal handling of the blocks, but allow the individual sheets to be separated by detachment easily from the top of the blocks. After a sheet has been removed from a block, the coadhesive bands on the sheet will not adhere to most of the surfaces, however, if desired, the sheet can adhere again to other sheets on the block at Press your coadhesive bands together. Blocks or cubes similar to block 10 that includes more than 100 sheets can be manufactured by the same method, except that the coadhesive should be applied to the sheets in bands of approximately 1.27 centimeters (1/2 inches) in width on each sheet in the block, and cuts with the guillotine cutting device must be cut between or through ( do not longitudinally bisect) the adhesive strips, as the longitudinal cut through the adhesive of such a large number of sheets may interfere with the cutting action of the cutter. The coadhesive bands of this width will retain the sheets in place during normal handling of the block or hub, but will also allow the individual sheets to be separated by detachment easily from the top of the block. After a sheet is removed from the block, the coadhesive bands on the sheet will not adhere to most other surfaces. However, if desired, the sheet can adhere again to the other sheets in the blocks by pressing their coadhesive bands together. Master blocks and individual blocks that do not have signs printed on their surfaces can be manufactured using coating equipment, master cutting sheets, master cut shift blocks as described above. further, a master roll of a printed or unprinted sheet can be made using the adhesive coating equipment described above with or without the printer (as appropriate) and then rolling the printed or unprinted sheet onto a roll about an axis, with opposite edges of the sheet in alignment with the ends of the roller. Such rollers can then be stored and / or transported to a different position for subsequent printing (if not printed) and for subsequent conversion into master sheets, master blocks and individual blocks in a manner similar to that described above. The structures and methods according to the present invention have now been described with reference to various embodiments and modifications thereof. It will be apparent to those familiar with the art that many changes can be made to the structures and methods described herein without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the structures and methods specifically described in this application, but only by the structures and methods described by the language of the claims and the equivalents to those structures and methods.

It is noted that in relation to this date, the best method known by the applicant to carry out the aforementioned invention, is the conventional one for the manufacture of the objects to which it relates. Having described the invention as above, property is claimed as contained in the following:

Claims (33)

1. A block, characterized in that it comprises: a plurality of flexible and unfolded sheets, each having a first and second main surfaces extending between opposite edges, the sheets are placed surface on the surface in the stack, and block forming means for releasably adhering portions of the main surfaces of adjacent sheets in the stack together, to maintain the sheets in the stack, the block forming means comprise at least some of the sheets having coated coadhesive patterns on major surfaces of adjacent edges, the coadhesive patterns adhere to coadhesive patterns on adjacent sheets in the stack and releasably adhere portions of the major surfaces of adjacent sheets in the stack together, in a surface to surface relationship until the coadhesive patterns are separated by peeling. The block according to claim 1, characterized in that at least some of the sheets have coadhesive patterns comprising a first coadhesive strip coated on the first main surface adjacent to one of the opposite edges, and a second strip of adhesive. Coadhesive coated on the second main surface adjacent one of the opposite edges. The block according to claim 2, characterized in that the first and second coadhesive strips on each of one of the sheets are coated adjacent to it of the opposite edges. 4. The block according to claim 2, characterized in that each of the sheets in the stack having sheets along both main surfaces, has its first and second coadhesive bands in the first and second coadhesive bands on each one of the leaves and they are adjacent to the same of the opposite edges. The block according to claim 2, characterized in that the first and second bands of coadhesives on each of the sheets are adjacent opposite the opposite edges. The block according to claim 2, characterized in that each of the sheets in the stack having sheets along both main surfaces, has first and second coadhesive bands and first and second coadhesive bands on each of the leaves that are adjacent to the opposite parts of the opposite edges. The block according to claim 1, characterized in that the stack has a plurality of lateral surfaces defined by the edges of the sheets, with each of the surfaces having graphics printed on the edges of the sheets. The block according to claim 1, characterized in that the block forming means further comprise some of the sheets each having a pattern of pressure-sensitive adhesive on one of the main surface adjacent to one of the edges Opposite, the pattern of pressure sensitive adhesive adheres releasably to other of the major surfaces of adjacent sheets in the stack. The block according to claim 8, characterized in that the pairs of adjacent sheets in the stack are adhered together alternately by coadhesive patterns and by one of the patterns of pressure sensitive adhesive. The block according to claim 9, characterized in that the block has a plurality of lateral surfaces defined by leaf edges, and the coadhesive patterns and patterns of pressure-sensitive adhesive are along the edges of the sheets which define the same side surface of the stack. The block according to claim 9, characterized in that the block has a plurality of lateral surfaces defined by the edges of the sheets, and the coadhesive patterns and the patterns of pressure-sensitive adhesive are along the edges of sheets that define the opposite lateral surfaces of the stack. 1

2. The block according to claim 1, characterized in that the sheets have printed signs along at least one of the main surfaces. 1

3. The block according to claim 1, characterized in that the sheets are made of paper. 1

4. The block according to claim 1, characterized in that the sheets are made of a polymeric film. 1

5. A master block, characterized in that it comprises: a plurality of flexible, unfolded, master sheets, each having first and second opposed major surfaces extending between opposite edges, the master sheets being placed surface-to-surface in the master block, and block forming means for releasably adhering portions of the main surfaces of adjacent master sheets in the master block, together to maintain the master sheets in the master block, the block forming means comprises at least part of the master sheets having Separate patterns of coadhesive coated on both major surfaces, coadhesive patterns adhere to adjacent master sheet coadhesive patterns in the master block and releasably adhere the major surfaces of adjacent master sheets in the master block, together, in a surface relationship to surface, until the coadhesive patterns are plow by detachment. 1

6. The master block according to claim 15, characterized in that the block forming means further comprises some of the master sheets having separate strips of pressure-sensitive adhesive on one of the main surfaces, the strips of adhesive sensitive to the pressure releasably adhere to other parts of the main surfaces of adjacent master sheets in the master block. 1

7. The master block according to claim 15, characterized in that the pairs of adjacent master sheets in the master block are adhered together alternately by separate bands of coadhesive and by separate bands of pressure sensitive adhesive. 1

8. The master block according to claim 15, characterized in that the master sheets have printed signs along at least one of the main surfaces. 1

9. The master block according to claim 15, characterized in that the master sheets are made of paper. 20. A master roll, characterized in that it comprises: a flexible, unfolded master sheet having first and second opposed major surfaces extending between opposite edges, the master sheet is wound on the master roll around an axis with opposite edges generally in alignment at the ends of the roller, and means for releasably adhering portions of the main surfaces of adjacent coils of the master sheet on the master roller, together, to maintain the master sheet on the master roller, the media comprises separate coadhesive bands coated on both major surfaces, the coadhesive bands in each of the coils adheres to coadhesive bands in adjacent coils of the master sheet on the master roll and releasably adhere the main surfaces of adjacent coils on the master roll together, in a surface to surface ratio until the coadhesive bands are separated by detachment The master roller, according to claim 20, characterized in that the means further comprises a master sheet having separate strips of pressure-sensitive adhesive on one of its main surfaces, the separate strips of pressure-sensitive adhesive freely adhere together parts of the main surfaces of adjacent coils of the master sheet in the master roller. 22. The master roller, according to claim 20, characterized in that the master sheet has printed signs along at least one of the main surfaces. 23. The master roller, according to claim 20, characterized in that the master sheets are made of paper. 24. A method for making blocks of sheets, the method is characterized in that it includes the steps of: coating both main side surfaces of a length of sheet material with co-adhesive patterns; converting the coated and printed length of the sheet material into a plurality of blocks with portions of the coadhesive coatings on the sheets releasably adhering the sheets together in the blocks. 25. A method for forming sheet blocks, according to claim 24, characterized in that the conversion step comprises: cutting the length coated with coadhesive with sheet material into master sheets of a predetermined size; stacking the master sheets together to form a master block while moving the master sheets to align the edges of the master sheets in the master block; and cutting the master stack into a plurality of blocks. 26. A method for forming sheet blocks, according to claim 24, characterized in that the coating step also covers at least one side surface of the length of the sheet material with a reclosable pressure-sensitive adhesive pattern. A method for forming blocks of sheets, according to claim 24, characterized in that the method further includes the step of printing signs on at least one of the major surfaces of the length of the sheet material before the conversion stage. 28. A method for forming a master block from which blocks of sheets are cut, the method is characterized in that it includes the steps of: coating both major side surfaces of a length of sheet material with coadhesive standards; cutting the coated length of sheet material into master sheets of a predetermined size; and stacking together the master sheets to form a master block which can be cut into a plurality of individual blocks while the master sheets are displaced to align the edges of the master sheets in the master block. 29. A method for forming a master block, according to claim 28, characterized in that the coating step covers one of the side surfaces of the length of the sheet material with a reclosable pressure-sensitive adhesive pattern. 30. A method for forming a master block, according to claim 28, characterized in that the method further includes the step of printing signs on at least one of the major surfaces of the length of sheet material before the conversion step. . 31. A method for forming helically wound master rolls of sheet material, characterized in that it includes the steps of: coating both surfaces of a length of sheet material with a coadhesive pattern; and winding the length of the sheet material into rolls with a coadhesive pattern adhering together the adjacent rolls of the roll. 32. A method for forming a helically wound roller, according to claim 31, characterized in that the coating step further includes coating a side surface of the length of the sheet material with reclosable pressure sensitive adhesive. The method for forming a helically wound roller, according to claim 31, characterized in that the method further includes the step of printing signs on at least one of the major surfaces of the sheet material length prior to the step of rolled