JP6412756B2 - Paper and paper transport method - Google Patents

Description

  The present invention relates to a sheet, a sheet conveying apparatus, and a sheet conveying method.

  As a sheet on which a folding line for folding is formed, for example, there is a sheet used for a so-called flat file. The paper used for the flat file is formed by folding a sheet of paper with a crease to form at least a front cover and a back cover, and a document or the like is bound in an inner space sandwiched between the front cover and the back cover. . Some of these sheets have a back cover part formed between a front cover part and a back cover part, and some have an attachment part to which a binding tool is attached (for example, Patent Documents). 1).

JP 2000-229492 A

  For example, when a sheet is conveyed to be printed on an image forming apparatus such as a printer, a plurality of sheets are stacked and placed on a manual feed tray or the like of the image forming apparatus. When the sheets are stacked, the folding lines of the paper also overlap each other. Therefore, if the depth of the folding lines is deep, the folding lines are caught during conveyance, and the paper is not conveyed.

  In the present invention, when the paper is transported in the transport direction by the paper transport device, the folding lines are formed between the stacked sheets, rather than the case of transporting the paper having the depths deeper than 90 μm. The purpose is to suppress the catching.

The invention according to claim 1 is a sheet that is used in a sheet conveying apparatus having a function of printing image information with a longitudinal direction as a conveying direction, and extends in a direction along the short direction and has a depth. There is formed fold muscle is 90μm or less, Ri basis weight of 200gsm ^(g / m 2) ~370gsm der, a sheet, characterized in that it is used as a flat file by folding in the folding muscle.
The invention according to claim 2 is the paper according to claim 1, wherein the crease has a depth of 40 μm or more.
The invention according to claim 3 is characterized in that a static friction coefficient is 0.8 or less when trying to convey the uppermost sheet from a state where a plurality of sheets are stacked. Or the paper described in 2.
The invention according to claim 4 is the paper according to any one of claims 1 to 3, wherein the paper is formed in a predetermined shape by being bent at the fold line. is there.
The invention according to claim 5 is a sheet that is used in a sheet conveying apparatus having a function of printing image information and whose longitudinal direction is the conveying direction, and is previously determined to extend in a direction along the short direction. A depth of the crease is formed, and the depth of the crease is larger than the size at which the crease breaks when the crease is folded, and a plurality of sheets are stacked on the stacking portion of the sheet conveying device When the uppermost sheet is conveyed, the sheet is smaller than the size that causes the conveyance failure caused by the overlapping of the fold lines.
In the invention according to claim 6 , a sheet used as a flat file is formed by defining a conveyance direction with respect to the sheet conveyance device, forming a folding line extending in a direction intersecting the conveyance direction, and bending the folding line. The sheet is conveyed, has a folding line having a depth of 90 μm or less and extending in a direction intersecting the conveyance direction, and has a basis weight of 200 gsm (g / m ² ) to 370 gsm. This is a paper transport method.
The invention according to claim 7 is a sheet conveying method according to claim 6, wherein the depth of the creases formed in the paper is 40μm or more.

According to the first aspect of the present invention, when the paper is transported in the transport direction by the paper transport device, the stacked paper is more than the case of transporting the paper having a crease deeper than 90 μm. Suppresses the folding lines from being caught between each other. In addition, the sheet conveyed by the sheet conveying apparatus can be formed as a flat file.
According to the second aspect of the present invention, the fluff generated when the paper is bent along the folding line is suppressed as compared with the case where the depth of the folding line formed on the paper is smaller than 40 μm.
According to the invention according to claim 3, when the paper is transported in the transport direction by the paper transport device, the stacked paper is more than that in the case of transporting the paper having a crease deeper than 90 μm. It is possible to suppress the folding lines from being caught between each other.
According to the invention which concerns on Claim 4, the thing of a three-dimensional shape can be created using the paper conveyed with the paper conveying apparatus.
According to the fifth aspect of the present invention, it is possible to suppress the occurrence of conveyance failure due to overlapping of folding lines when conveying the uppermost sheet from a state where a plurality of sheets are stacked on the stacking unit of the sheet conveying apparatus. .
According to the invention of claim 6 , it is possible to suppress the folding lines from being caught between the stacked sheets as compared with the case where the sheet having the folding lines deeper than 90 μm is conveyed by the sheet conveying device. To do. In addition, the sheet conveyed by the sheet conveying apparatus can be formed as a flat file.
According to the seventh aspect of the present invention, the fluff generated when the paper is bent along the folding line is suppressed as compared with the case where the depth of the folding line formed on the paper is smaller than 40 μm.

It is a perspective view which shows the flat file in which the paper based on one embodiment of this invention is used. It is a top view which shows the surface (Otemen) of the paper. FIG. 6 is a schematic diagram illustrating a state in which a plurality of sheets (for example, 10 sheets) are stacked and set on a manual feed tray of an image forming apparatus having a function of printing image information such as texts on a sheet. . (A) is sectional drawing which shows the cross section along the IV-IV line in FIG. 2, (B) is an enlarged view of the concave folding line in (A), (C) is the convex folding line in (A). FIG. FIG. 4 is a schematic diagram illustrating a cross section in a state where a plurality of sheets are stacked and placed on a manual feed tray of the image forming apparatus. FIG. 6 is a schematic diagram corresponding to FIG. 5, showing a state in which the uppermost sheet of the sheets shown in FIG. 5 is being conveyed in the conveyance direction. (A) is a key map of a crease formation device which forms a crease. (B) is the schematic diagram demonstrated about the 1st roll and the 2nd roll. (A)-(c) is the figure put together about the present Example.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
<Flat file paper>
FIG. 1 is a perspective view showing a flat file 100 in which a paper 10 according to an embodiment of the present invention is used, and FIG. 2 is a plan view showing a front surface 10a of the paper 10.
The flat file 100 shown in FIG. 1 includes a sheet 10 that serves as a cover when the document 200 is bound inside, and a binding tool 90 that binds the document 200 to the inside of the sheet 10.

The binding tool 90 includes two binding bands 91 that pass through holes (not shown) formed in the document 200, and a pressing tool 92 that presses the binding band 91 and fixes the document 200 to the paper 10.
As shown in FIG. 2, the sheet 10 is formed in a flat plate shape with a single sheet of paper, for example. The paperboard is not limited to a multi-layer paper (laminated paper) but also includes a single-layer paper. The four corner portions 10c of the paper 10 are each rounded with an R (R). A plurality of folding lines 15, 16, 17, and 18 are formed on the sheet 10 along the short direction Y perpendicular to the longitudinal direction X.

  The folding lines 15, 16, and 18 are so-called mountain folding lines that are bent so as to protrude toward the front side of the paper surface of the sheet 10 of FIG. On the other hand, the folding line 17 is a so-called valley folding line that is bent so as to be recessed toward the back side of the paper surface of the sheet 10 of FIG. By folding the folding lines 15, 16, 17, and 18 of the flat sheet 10, the sheet 10 is formed on a three-dimensional cover as shown in FIG.

  As shown in FIG. 2, the folding line 15 includes a portion 11 (hereinafter referred to as a front cover portion 11) and a back cover portion in a three-dimensionally formed paper 10 (see FIG. 1). 12 (hereinafter referred to as the spine portion 12). The folding line 16 is a line that partitions the spine cover part 12 and the attachment part 13 to which the binding tool 90 is attached. The folding line 18 serves as a line that partitions the attachment part 13 and a part 14 (hereinafter referred to as a back cover part 14) serving as a back cover.

  The attachment portion 13 is formed by overlapping a first attachment portion 13a adjacent to the back cover portion 12 and a second attachment portion 13b adjacent to the back cover portion 14, and the folding line 17 is formed of the first attachment portion. It is a streak that separates 13a and the second attachment portion 13b. The first attachment portion 13a and the second attachment portion 13b are overlapped with the front surfaces 10a of the paper 10 facing each other. In the three-dimensional state used as the flat file 100, the first attachment portion 13a and the second attachment portion 13b are fixed to each other with a double-sided tape or a stapler.

  Also, two attachment holes 19 are formed in the first attachment portion 13a and the second attachment portion 13b, respectively, along the short direction Y. These mounting holes 19 are formed in a circular shape. In a state where the first attachment portion 13a and the second attachment portion 13b are overlapped, the two attachment holes 19 formed in the first attachment portion 13a are respectively two attachment holes 19 formed in the second attachment portion 13b. Is superimposed on.

  A binding band 91 (see FIG. 1) with one end formed larger than the diameter of the attachment hole 19 is passed through the attachment hole 19 from the second attachment portion 13b side. The binding band 91 that has come out from the side of the first attachment portion 13a through the attachment hole 19 passes through a binding hole (not shown) formed in the document 200 (see FIG. 1) and is pressed by the presser 92 of the binding tool 90. Pressed. As a result, the document 200 is fixed to the attachment portion 13 and bound to the flat file 100.

<State of loading paper on paper transport device>
In FIG. 3, a plurality of sheets (for example, 10 sheets) 10 are stacked and set on a manual feed tray 310 of an image forming apparatus 300 having a function of printing image information including text such as text on the sheet 10. It is a schematic diagram which shows the state. In the present embodiment, the image forming apparatus 300 is an example of a sheet conveying apparatus. The manual feed tray 310 is an example of a stacking unit that stacks the sheets 10 before being transported. As shown in FIG. 3, the image forming apparatus 300 conveys the sheet 10 placed on the manual feed tray 310 in a flat state before the folding lines 15, 16, 17, and 18 (see FIG. 2) are bent. Transport in direction Z. Then, as illustrated in FIG. 1, the image forming apparatus 300 performs printing on the surface facing upward on the manual feed tray 310 while transporting the paper 10 downstream in the transport direction Z.

When printing on the paper 10 with the image forming apparatus 300, printing is performed on at least one of the front cover portion 11, the back cover portion 12, and the back cover portion 14 on the front surface 10 a of the paper 10. The contents of the print are, for example, a title name of a document 200 (see FIG. 1) bound to the flat file 100, an author name and a provider name of the document 200, an address of the document 200, an image such as a logo mark or a photograph. .
When the paper 10 is set on the manual feed tray 310 of the image forming apparatus 300, it is necessary to set the paper 10 with the front surface 10a facing upward. This is because if the paper 10 is set with the back surface 10b (see FIG. 1) facing upward, printing is performed on the back surface 10b of the paper 10.

Further, when the paper 10 is set on the manual feed tray 310 of the image forming apparatus 300, the front cover portion 11 of the paper 10 is set so as to be closer to the downstream side in the transport direction Z of the image forming apparatus 300 than the back cover portion 14. is necessary. If the back cover portion 14 is set so as to be positioned downstream of the front cover portion 11 in the transport direction Z, for example, the contents to be printed on the front cover portion 11 are printed upside down on the back cover portion 14. This is because that.
In the sheet 10 of the present embodiment, the transport direction Z with respect to the image forming apparatus 300 is determined so that the front cover portion 11 is aligned downstream of the transport direction Z by the image forming apparatus 300 and the back cover portion 14 is aligned upstream. Yes. Each of the folding lines 15, 16, 17, 18 extends in a direction perpendicular to the conveyance direction Z of the image forming apparatus 300.

<Details of folding lines on paper>
4A is a cross-sectional view showing a cross section taken along line IV-IV in FIG. 2, FIG. 4B is an enlarged view of the concave folding line 15 in FIG. ) Is an enlarged view of the convex fold line 17 in FIG. When the paper 10 is placed with the surface 10a facing upward as shown in FIG. 3, the folding lines 15, 16, 18 for mountain folding of the paper 10 are depressed downward as shown in FIG. It is formed in a concave shape. On the other hand, the folding line 17 for valley folding of the paper 10 is formed in a convex shape protruding upward.

Here, as shown in FIG. 4B, the concave folding line 15 of the present embodiment takes a shape that is substantially symmetrical between the upstream side and the downstream side in the transport direction Z. That is, the slopes of the downstream falling portion 15b on the downstream side in the transport direction Z and the upstream falling portion 15c on the upstream side in the transport direction Z are substantially the same.
Note that the other concave folding lines 16 and 18 are also similar to the folding line 15 and have a shape that is substantially symmetrical between the upstream side and the downstream side in the transport direction Z. That is, for the folding line 16, the slope of the downstream falling portion 16b on the downstream side in the transport direction Z and the upstream falling portion 16c on the upstream side in the transport direction Z are substantially the same. Further, regarding the crease 18, the inclination of the downstream falling portion 18 b on the downstream side in the conveyance direction Z and the inclination of the upstream falling portion 18 c on the upstream side in the conveyance direction Z are substantially the same (see FIG. 5).

  Further, as shown in FIG. 4C, the convex folding line 17 has a shape that is substantially symmetrical between the upstream side and the downstream side in the transport direction Z. That is, the slopes of the downstream rising portion 17b on the downstream side in the transport direction Z and the upstream rising portion 17c on the upstream side in the transport direction Z are substantially the same.

FIG. 5 is a schematic diagram illustrating a cross section in a state in which a plurality of sheets 10 are stacked and placed on the manual feed tray 310 of the image forming apparatus 300. FIG. 6 shows a state in which the uppermost sheet 10 of the sheets 10 shown in FIG.
As shown in FIG. 5, a plurality of sheets 10 according to the present embodiment are set to be stacked on the image forming apparatus 300. Then, as shown in FIG. 6, the plurality of sheets 10 set in the image forming apparatus 300 are conveyed one by one from the top in the conveying direction Z of the image forming apparatus 300 by the sending roll 320 of the image forming apparatus 300. The Here, the delivery roll 320 can be regarded as an example of a transport unit that transports the paper 10.

  At this time, the folding line 15, 16, 18 may be caught between the uppermost sheet 10 being conveyed and the lower layer sheet 10 overlapping the sheet 10. That is, the downstream falling portion 15 b of the concave folding line 15 of the uppermost paper 10 may be caught by the downstream falling portion 15 b of the lower paper 10 that overlaps the paper 10. Similarly, the downstream falling portions 16b and 18b of the other concave folding lines 16 and 18 may be caught.

Similarly, the convex creases 17 may be caught. That is, the downstream rising portion 17 b of the convex folding line 17 of the uppermost paper 10 may be caught by the downstream rising portion 17 b of the lower paper 10 that overlaps the paper 10.
When the creases are caught, the uppermost sheet 10 cannot be conveyed by the delivery roll 320, resulting in conveyance failure.

  Therefore, in the present embodiment, the concave folding lines 15, 16, 18 and the convex folding line 17 are set so as to satisfy the following conditions, thereby preventing the folding lines from being caught.

As described above, the paper 10 used in the present embodiment is, for example, a paperboard, and the basis weight is 200 gsm (g / m ² ) to 370 gsm. The basis weight is more preferably 260 gsm to 300 gsm. The depths of the folding lines 15, 16, 17, and 18 are set as follows for the paper 10 having this basis weight.

  In the present embodiment, as shown in FIG. 4B, the depth d1 of the concave folding line 15 is 90 μm or less. Here, the depth d1 of the concave folding line 15 is defined by the distance from the surface 10a of the paper 10 to the deepest portion 15e of the folding line 15. This is because the folding line 15 is closer to the back surface 10b side of the sheet 10 than the flat part 15a downstream of the folding line 15 in the transport direction Z and the flat part 15d upstream of the folding line 15 in the transport direction Z (this In other words, it can be rephrased as a concave shape having a depth d1 in the downward direction. This also applies to the concave folding lines 16 and 18, and the depth of the concave folding lines 16 and 18 is 90 μm or less.

  In the present embodiment, as shown in FIG. 4C, the depth d2 of the convex crease 17 is 90 μm or less. Here, the depth d2 of the convex crease 17 is defined by the distance from the back surface 10b of the paper 10 to the deepest portion 17e of the crease 17. This is because the folding line 17 is closer to the surface 10a of the sheet 10 than the flat part 17a on the downstream side in the conveying direction Z from the folding line 17 and the flat part 17d on the upstream side in the conveying direction Z from the folding line 17. In other words, it can also be said that a convex shape protruding upward by a depth d2 is formed.

  Thus, by setting the depth d1 of the concave fold lines 15, 16, 18 and the depth d2 of the convex fold line 17 to be equal to or less than a predetermined depth, the above-described fold lines are caught. It becomes difficult to occur. That is, the folding lines 15, 16, 17, and 18 are less likely to be caught between the uppermost sheet 10 being conveyed and the lower layer sheet 10 overlapping the sheet 10. For example, with respect to the folding line 15, the downstream falling part 15 b of the concave folding line 15 is less likely to be caught by the downstream falling part 15 b of the lower sheet 10 that overlaps the sheet 10. It depends. This also applies to the folding lines 16, 17, and 18. That is, the downstream falling portion 16b of the concave fold line 16, the downstream rising portion 17b of the convex fold line 17, and the downstream falling portion 18b of the concave fold line 18 are respectively lower layer paper 10. The downstream falling portion 16b, the downstream rising portion 17b, and the downstream falling portion 18b are less likely to be caught. As a result, the conveyance failure of the paper 10 is less likely to occur.

  In this way, the folding lines 15, 16, 17, 18 become less likely to be caught as the depth of the folding lines 15, 16, 17, 18 is reduced. However, if the depths of the folding lines 15, 16, 17, and 18 are excessively reduced, it becomes difficult for the user of the paper 10 to fold the folding lines 15, 16, 17, and 18 when performing the folding process. Further, there arises a problem that the cracks are easily generated. This folding is a phenomenon in which when the folding lines 15, 16, 17, and 18 are bent, stress is concentrated in the mountain fold side portion, thereby causing cracking of the paper layer and fibrous fluffing. When the breakage occurs, when the paper 10 is the flat file 100, the appearance is deteriorated.

Therefore, there is a lower limit for the depth of the folding lines 15, 16, 17 and 18. In the present embodiment, when the paper 10 having a basis weight of 200 gsm to 370 gsm is used, it is found that if the depth of the folding lines 15, 16, 17, 18 is 40 μm or more, it is difficult to cause the folding. This value is adopted as the depth of the streaks 15, 16, 17, and 18.
Eventually, the depth of the folding lines 15, 16, 17, and 18 when the paper 10 having a basis weight of 200 gsm to 370 gsm is used needs to be 40 μm to 90 μm.

  In the example described above, the depths of the folding lines 15, 16, 17, and 18 are defined by specific numerical values, but other definitions may be used. For example, the depths of the folding lines 15, 16, 17, 18 are larger than the size at which the folding process occurs at the folding lines 15, 16, 17, 18. It can also be said that when the uppermost sheet is transported from the state where the sheets are stacked, the size is smaller than the size at which the transport failure caused by the overlapping of the folding lines 15, 16, 17, and 18 occurs.

  When the paper 10 having a basis weight of 200 gsm to 370 gsm is used, the lower limit value at which no cracking occurs as described above is a substantially constant value (40 μm in the above example). When this basis weight paper 10 is used, the depth of the folding lines 15, 16, 17, 18 becomes a problem as a condition for causing a conveyance failure caused by the overlapping of the folding lines 15, 16, 17, 18 and other factors. Does not matter much. For example, there is almost no influence by the diameter and material of the delivery roll 320 (see FIG. 5). That is, whether or not the folding lines are caught or whether or not the cracks are generated is determined by the basis weight of the paper 10 and the depths of the folding lines 15, 16, 17, and 18.

  Further, when the depths of the folding lines 15, 16, 17, and 18 are increased, the uppermost sheet 10 is transported by being caught at the downstream falling portions 15b, 16b, and 18b and the downstream rising portion 17b. The apparent static coefficient of friction increases. That is, the coefficient of static friction increases when trying to convey the uppermost sheet from a state where a plurality of sheets are stacked. When the static friction coefficient becomes larger than the static friction coefficient generated when the feed roll 320 of the image forming apparatus 300 comes into contact with the uppermost sheet 10, the folding lines are caught. That is, the depth of the folding lines 15, 16, 17, and 18 is such that the static friction coefficient when conveying the uppermost sheet 10 is smaller than the static friction coefficient generated between the feed roll 320 and the uppermost sheet 10. It can also be said that it is within the range. Specifically, if the coefficient of static friction when trying to convey the uppermost sheet 10 is 0.8 or less, the conveyance failure of the sheet 10 is less likely to occur.

The paper 10 of the present embodiment is formed with the concave folding lines 15, 16, 18 for mountain folding and the convex folding lines 17 for valley folding. Only a concave fold line may be formed, or only a convex fold line may be formed.
Further, a plurality of folding lines may be formed, or only one folding line may be formed.

The sheet 10 of the present embodiment is applied to a sheet used for the flat file 100 as an example. Here, in general, a flat file forms at least a front cover and a back cover by folding a sheet of paper at a folding line, and a document or the like is bound in an inner space sandwiched between the front cover and the back cover. . Accordingly, the paper used for the flat file only needs to include at least the front cover portion 11 (see FIG. 1) and the back cover portion 14 and may not include the back cover portion 12 or the attachment portion 13. Good.
Further, the paper according to the present invention may not be entirely formed of a single type of material (for example, paper). For example, a sheet formed of a transparent resin material may be formed on a part of paperboard. It may be included.
The paper of the present invention is not limited to paperboard.

The paper according to the present invention may be a paper used for other than flat files. That is, the sheet according to the present invention may be applied to a sheet for forming a box (including only a box housing part and a box cover part) as an example of a packaging container.
The paper forming the box as a packaging container has a large number of folding lines formed in advance in the vertical, horizontal and diagonal directions, and a three-dimensional box is formed by folding the paper along the folding lines. The Even when printing is performed by the image forming apparatus on the sheet portion that becomes the surface of the box, the sheet is set in a specific state with respect to the image forming apparatus by applying the sheet of the present invention.
That is, the sheet 10 of the present embodiment can be suitably used for a sheet that has a predetermined shape by being bent at a folding line.

  In the case of a sheet in which folding lines are formed in the vertical direction, the horizontal direction, and the diagonal direction, such as a sheet forming a box, the folding lines extending at least in a direction intersecting the conveyance direction by the image forming apparatus. For the above, the present invention may be applied. That is, among the fold lines formed on the sheet, the fold lines 15, 16, 17, and 18 do not have to have a depth of 40 μm to 90 μm for convex fold lines extending in the direction along the conveyance direction. Good.

<Formation method of folding line>
FIG. 7A is a conceptual diagram of a folding line forming device 400 that forms the bending lines 15, 16, 17, and 18.
As shown in the figure, the crease forming device 400 includes a first roll 401 and a second roll 402, and the first roll 401 and the second roll 402 rotate in conjunction with each other. The first roll 401 and the first roll 401 are biased by the second roll 402, and a nip portion N in which a predetermined pressure is generated is formed between the first roll 401 and the second roll 402. . And when the 1st roll 401 and the 2nd roll 402 rotate, the paper 10 is pinched | interposed in the nip part N, and the crease lines 15, 16, 17, and 18 are formed.

FIG. 7B is a schematic diagram illustrating the first roll 401 and the second roll 402.
As shown in the figure, the first roll 401 includes a convex portion 415a for forming the folding line 15, a convex portion 416a for forming the folding line 16, a concave portion 417a for forming the folding line 17, and a folding line. Protrusions 418a for forming the streaks 18 are formed on the surface.
Similarly, the second roll 402 has a recess 415 b for forming the folding line 15, a recess 416 b for forming the folding line 16, a projection 417 b for forming the folding line 17, and the folding line 18. A recess 418b is formed on the surface. These concave portions and convex portions are formed linearly in the axial direction of the first roll 401 and the second roll 402.

  At this time, the distance between the convex portion 415a and the convex portion 416a on the surface of the first roll 401 and the distance between the concave portion 415b and the concave portion 416b on the surface of the second roll 402 are the longitudinal lengths of the folding lines 15 and 16. This is the same as the distance in the direction X (see FIG. 2). The distance on the surface of the first roll 401 between the convex portion 416a and the concave portion 417a and the distance on the surface of the second roll 402 between the concave portion 416b and the convex portion 417b are the longitudinal directions of the folding line 16 and the folding line 17 It is the same as the distance of X. Furthermore, the distance on the surface of the first roll 401 between the concave portion 417a and the convex portion 418a, and the distance on the surface of the second roll 402 between the convex portion 417b and the concave portion 418b are the longitudinal directions of the folding line 17 and the folding line 18. It is the same as the distance of X.

  And when the 1st roll 401 and the 2nd roll 402 rotate and the convex part 415a of the 1st roll 401 will be in the position of the nip part N, the recessed part 415b of the 2nd roll 402 will also be in the position of the nip part N. Similarly, when the convex portion 416a of the first roll 401 is located at the nip portion N, the concave portion 416b of the second roll 402 is also located at the nip portion N. Further, when the concave portion 417a of the first roll 401 is positioned at the nip portion N, the convex portion 417b of the second roll 402 is also positioned at the nip portion N, and the convex portion 418a of the first roll 401 is positioned at the nip portion N. Sometimes, the concave portion 418b of the second roll 402 is also positioned at the nip portion N. That is, the convex portion 415a and the concave portion 415b, the convex portion 416a and the concave portion 416b, the concave portion 417a and the convex portion 417b, and the convex portion 418a and the concave portion 418b are received at the position of the nip portion N, respectively. A position on 402 is determined.

  In the crease forming device 400 shown in FIG. 7B, when the paper 10 is inserted into the nip portion N from the left side in the drawing, the first roll 401 first protrudes as the first roll 401 and the second roll 402 rotate. The portion 415 a and the recess 415 b of the second roll 402 meet at the nip portion N. Then, the sheet 10 is pressed by the pressure generated at the nip portion N, and as a result, the concave folding line 15 is formed on the sheet 10.

  When the first roll 401 and the second roll 402 are further rotated, the convex portion 416a of the first roll 401 and the concave portion 416b of the second roll 402 meet at the nip portion N next. A concave folding line 16 is formed on the paper 10.

  Similarly, when the concave portion 417a of the first roll 401 and the convex portion 417b of the second roll 402 meet at the nip portion N as the first roll 401 and the second roll 402 rotate, the convex folding line 17 is Formed on the paper 10. When the convex portion 418 a of the first roll 401 and the concave portion 418 b of the second roll 402 meet at the nip portion N, the concave folding line 18 is formed on the paper 10.

  As described above, the folding lines 15, 16, 17, 18 are formed by the folding line forming apparatus 400. In the above-described example, the method of forming the folding lines 15, 16, 17, and 18 on each sheet of paper 10 is shown. However, in actuality, the longitudinal direction before cutting into the set size for each sheet is shown. From the viewpoint of production efficiency, it is preferable to supply the continuous continuous paper connected to X (see FIG. 2) to the folding line forming device 400 to form the folding lines 15, 16, 17, and 18. Then, after forming the folding lines 15, 16, 17, 18 on the continuous paper, the attachment holes 19 (see FIG. 2) are formed by a punching device (not shown), and the continuous paper is cut by a cutting device (not shown). 10 is manufactured.

  EXAMPLES Hereinafter, although this invention is demonstrated in detail using an Example, this invention is not limited by these Examples, unless the summary is exceeded.

FIGS. 8A to 8C are diagrams summarizing the present embodiment.
A paper board having a size of 307 mm × 520 mm and a basis weight of 256 gsm was prepared as the paper 10. Then, the folding lines 15, 16, 17, and 18 were formed on the sheet 10 using the folding line forming apparatus 400 as described with reference to FIG. The depths of the folding lines 15, 16, 17, 18 were 12 types between 15 μm and 180 μm shown in FIG.

  As described with reference to FIG. 3, a plurality of sheets 10 are placed on the manual feed tray 310 of the image forming apparatus 300, and an image is formed by the image forming apparatus 300.

At this time, it was visually confirmed whether or not the folding lines were caught and broken. Furthermore, the paper 10 was actually folded at the folding lines 15, 16, 17, and 18, and the ease of folding was evaluated.
Then, a conveyance failure occurrence rate (%) was calculated as a rate at which a sheet conveyance failure occurred due to catching between the creases. Further, as shown in FIG. 8C, the cracks were evaluated in four stages of G1 to G4 depending on the state of the folds. Further, regarding the ease of folding, as shown in FIG. 8C, the ease of folding was evaluated in four stages of G1 to G4.

Evaluation was performed as follows.
First, regarding the catching between the folding lines, the case where the paper conveyance failure occurrence rate was 0% was accepted, and the case where even a slight paper conveyance failure occurred was rejected.
About the crack, the case of G1 and G2 was set as the pass, and the case of G3 and G4 was set as the failure because the crack occurred.
Regarding the ease of folding, the cases of G1 and G2 were accepted, and the cases of G3 and G4 were rejected.

An evaluation result is shown to Fig.8 (a)-(b).
As shown in FIGS. 8A to 8B, when the folding lines have depths of 110 μm and 180 μm, paper conveyance failure occurred. On the other hand, when the folding line has a depth of 89 μm or less, no paper conveyance failure occurred. That is, the occurrence rate of paper conveyance failure was 0%.

  Further, when the folding line had a depth of 15 μm, 25 μm, or 35 μm, a crack occurred. On the other hand, no crack occurred when the crease depth was 43 μm or more.

  In view of the above situation, when the depth of the crease is 40 μm to 90 μm, it was determined that no conveyance failure of the paper occurred and no breakage occurred. It was judged that it was not difficult to fold.

DESCRIPTION OF SYMBOLS 10 ... Paper, 10a ... Front (Omenen), 10b ... Back, 15, 16, 17, 18 ... Folding line, 15b ... Downstream falling part, 15c ... Upstream falling part, 17b ... Downstream rising Portion, 17c: falling portion on the upstream side, 100 ... flat file, 300 ... image forming apparatus, Z ... transport direction

Claims (7)

In a paper transport device having a function of printing image information, the paper is used as the transport direction in the longitudinal direction.
The depth extends in a direction along the short side direction is formed fold muscle is 90μm or less, a basis weight of 200gsm ^(g / m 2) ~370gsm der is, flat file by folding in the folding muscle Paper characterized by being used as .   The sheet according to claim 1, wherein the crease has a depth of 40 μm or more.   3. The sheet according to claim 1, wherein a coefficient of static friction when the uppermost sheet is transported from a state where a plurality of sheets are stacked is 0.8 or less. 4.   The sheet according to any one of claims 1 to 3, wherein the sheet is formed in a predetermined shape by being bent at the folding line. In a paper transport device having a function of printing image information, the paper is used as the transport direction in the longitudinal direction.
A fold line of a predetermined depth extending in a direction along the short direction is formed,
The depth of the folding line is larger than the size at which the folding occurs when the folding process is performed at the folding line, and when the uppermost sheet is transported from a state where a plurality of sheets are stacked on the stacking unit of the sheet transporting device. In addition, the paper is smaller than a size that causes a conveyance failure caused by overlapping of the creases. A conveyance direction with respect to the paper conveyance device is determined, a folding line extending in a direction intersecting the conveyance direction is formed, and a sheet used as a flat file is conveyed by being bent at the folding line ,
The paper transporting is characterized in that a folding line having a depth of 90 μm or less is formed extending in a direction intersecting the transporting direction, and a basis weight is 200 gsm (g / m ² ) to 370 gsm. Method. The sheet conveying method according to claim 6 , wherein a depth of the crease formed on the sheet is 40 μm or more.

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