JP2010253827A - Thermosensitive stencil printer for corrugated cardboard sheet, and printing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a thermosensitive stencil printer for a corrugated cardboard sheet and a printing method capable of obtaining a uniform image by a simple method without using a large printing drum even in the corrugated cardboard sheet before being processed to a case. <P>SOLUTION: The thermosensitive stencil printer for the corrugated cardboard sheet characterized by including a plurality of printing drums around which stencil printing base paper is wound and which are arranged in series and/or in parallel relative to a rotational axial direction and a slide mechanism capable of moving at least one of the plurality of the printing drums in the rotational axial direction is used. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a printing apparatus and a printing method for printing on a cardboard sheet using a heat-sensitive stencil.

  Conventionally, flexographic printing, pre-slot printing, thermal stencil printing, or inkjet printing has been considered for printing on rough paper such as corrugated cardboard sheets. A flexographic printing method or a pre-slot printing method is employed.

  These flexographic printing systems or pre-slot printing systems require a resin plate, which is disadvantageous particularly when the number of lots is small from the viewpoint of plate making time and cost. Depending on the number of printed sheets, the resin plate may be worn out, so that a new resin plate needs to be prepared, and there is a problem that the used resin plate increases.

  In addition, the ink jet method has an advantage that plate making is not necessary, but has a problem that printing speed is slow, for example, the ink is clogged in the head, so that the head needs to be replaced periodically. Further, there is a problem that fine control is required for the movement of the head, and the sound during the operation of the head becomes louder, or the low-viscosity ink penetrates the corrugated cardboard sheet and does not become glossy.

  The heat-sensitive stencil method can produce a heat-sensitive stencil sheet in a short time and at a low cost using the thermal head 8 or the like, and the heat-sensitive stencil sheet can be easily discarded (so-called plate is unnecessary). There are advantages.

  However, in the heat-sensitive stencil system as described above, a large printing drum is required because the printing area of the corrugated cardboard sheet is large, but it is difficult to produce a large printing drum, and even if it can be produced, printing is possible. In some cases, unevenness or the like occurs in the image, and a uniform printed image cannot be obtained.

  It is also possible to print the cardboard sheet into a case and then print with the heat-sensitive stencil method, but it is difficult to adjust the printing position and printing pressure, and the problem is that the ink is offset when the printing speed is increased. There was also.

  In view of the above problems, an object of the present invention is for a corrugated cardboard sheet that can obtain a uniform printed image by a simple method without using a large printing drum even if it is a corrugated cardboard sheet before being processed into a case. An object is to provide a thermal stencil printing apparatus and a printing method.

The present invention
A plurality of printing drums wound with heat-sensitive stencil paper and installed in series and / or in parallel with the direction of the rotation axis;
A slide mechanism capable of moving at least one of the plurality of printing drums in the rotation axis direction;
A heat-sensitive stencil printing apparatus for corrugated cardboard sheets is provided.

The present invention also provides:
A plurality of printing drums around which heat-sensitive stencil paper is wound are installed in series and / or in parallel to the direction of the rotation axis;
Moving at least one of the plurality of printing drums in the direction of the rotation axis to adjust the printing position;
There is provided a heat-sensitive stencil printing method for corrugated cardboard sheets characterized by printing on the corrugated cardboard sheet.

  According to the heat-sensitive stencil printing apparatus for cardboard sheets and the heat-sensitive stencil printing method for cardboard sheets of the present invention having such a configuration, even a cardboard sheet before being processed into a case can be easily used without using a large printing drum. A uniform printed image can be obtained by a simple method.

  ADVANTAGE OF THE INVENTION According to this invention, even if it is the corrugated cardboard sheet before processing into a case, the heat-sensitive stencil printing apparatus and printing method for corrugated cardboard sheets which can obtain a uniform printed image by a simple method, without using a big printing drum Can be realized.

  Further, according to the present invention, the following various effects can be obtained. That is, with the heat-sensitive stencil printing apparatus and printing method for corrugated cardboard sheets of the present invention, printing and box making can be performed within a few minutes after obtaining the print design. In addition, the initial printing cost is dramatically lower than that of the resin printing plate, and a small lot cardboard case can be printed at a low cost.

  Further, it is not necessary to store a printing plate like a resin printing plate, and image data may be stored and managed in the computer. Furthermore, the color of the ink can be easily changed by replacing the printing unit of this system. Further, if this printing unit is added in parallel, multi-color printing can be performed simultaneously, and this type of printing machine has the advantage that the same printing can be simplified without the need for skill.

It is a figure which shows the structure of 1st embodiment of the cardboard printing machine to which this invention is applied. It is a figure which shows the structure of 2nd embodiment of the cardboard printing machine to which this invention is applied.

  Hereinafter, preferred embodiments of a thermal stencil printing apparatus and printing method for corrugated cardboard sheets according to the present invention will be described with reference to the drawings, but the present invention is not limited to these. In the following description, the same or corresponding parts are denoted by the same reference numerals, and redundant description may be omitted.

[First embodiment]
A configuration of a first embodiment of a corrugated cardboard printing machine to which the present invention is applied is shown in FIG. As shown in FIG. 1, a first printing drum 1 and a second printing drum 2 are arranged in series with respect to the rotation axis direction on the same rotation axis, and a cardboard sheet feeding unit 4 and a printed cardboard sheet 9 are arranged. Is provided.

  As the first printing drum 1 and the second printing drum 2, a conventionally known printing drum can be used. For example, a screen mesh, a nonwoven fabric, and a sponge made of a flexible material that holds, absorbs, and permeates ink in a punching metal. Or the like may be wound around only the printed image portion.

  The flexible material to be wound around the punching metal of the first printing drum 1 and the second printing drum 2 is a hardness of a Shore A rubber hardness meter in a state of being wound around the printing drum with a thickness of 1 mm to 10 mm. A flexible material having an angle of 25 to 60 degrees is optimal. If the hardness is less than 25 degrees, the plate tends to wrinkle, and if it exceeds 60 degrees, the corrugated sheet corrugations are likely to occur, and the corrugated sheet corrugations are likely to be crushed, thereby deteriorating the strength of the corrugated sheet.

  Further, a heat sensitive stencil sheet 6, a thermal head 88 for plate making, and a discharge box (not shown) for collecting used plates are provided in front of and behind each of the first printing drum 1 and the second printing drum 2, respectively. A mechanism that automatically forms the data on the first printing drum 1 and the second printing drum 2 at the same time as the data is formed by the thermal head 8, and the previously printed plate before the plate making is automatically stored in the discharge box. A recovery mechanism is provided.

  These mechanisms may be in accordance with a conventionally known technique. For example, the image data input unit directly reads the image data with a scanner and forms the image on the thermal stencil sheet 6 with image data designed by image processing software (for example, illustrator). A mechanism for forming an image may be provided. Further, the press roll 3 is provided with a mechanism that can be attached to and detached from the first printing drum 1 and the second printing drum 2, and is operated so as to contact only a portion where a print image area exists.

  Here, a method for using the heat-sensitive stencil printing apparatus for corrugated cardboard sheets of the present embodiment configured as described above, that is, a work procedure of the heat-sensitive stencil printing method for corrugated cardboard sheets of the present embodiment will be described.

  First, the corrugated cardboard sheet 9 is set in the corrugated cardboard sheet feeding unit 4, and the print design is set to print image data for the first print drum 1 and print image data for the second print drum 2 by image processing software. Divide and input and calibrate the printing position.

  Thereafter, by making a plate making command, the old plates of the first printing drum 1 and the second printing drum 2 are automatically discharged, and a new plate on which a print image is formed by the thermal head 8 is automatically set to the first plate. The printing drum 1 and the second printing drum 2 are made to plate.

  After the idling rotation is performed for a predetermined time (for example, 30 seconds) so that the printing ink permeates the plate well, one print for print image confirmation is performed. After confirming the print position, print density and print design, and entering the number of prints and print speed, press the print start button to start printing.

  Then, after the printing of a predetermined number of sheets is completed, the printed cardboard sheet 9 is processed into a cardboard case by a box making machine, and is packed with a string every ten sheets, and a printed cardboard case is completed. In addition, when printing on 4 sides or printing with 2 colors, after printing once, printing is performed once again, and thereafter the box is manufactured in the same manner.

[Second Embodiment]
FIG. 2 shows a configuration of a second embodiment of the cardboard printing machine to which the present invention is applied.

  As shown in FIG. 2, in the present embodiment, the first printing drum 1 and the second printing drum 2 are arranged in parallel to the rotation axis direction on different rotation shafts in parallel (in series with respect to the conveyance direction). A corrugated cardboard sheet feeding unit 4 and a corrugated cardboard sheet discharge unit 5 for stocking the corrugated cardboard sheet 9 after printing are provided.

  Further, heat sensitive stencil paper 6, a thermal head 8 for plate making, and a waste box for collecting used plates are provided on the front and rear sides of the first printing drum 1 and the second printing drum 2, respectively, and image data is transferred to the thermal head. A mechanism for automatically landing on the first printing drum 1 and the second printing drum 2 at the same time as forming at 8, and a mechanism for automatically collecting the previously printed plate in the discharge box before plate making Is provided.

  These mechanisms may be in accordance with a conventionally known technique. For example, the image data input unit directly forms an image on the heat-sensitive stencil sheet 6 with a mechanism for reading image data with a scanner and image data designed with image processing software. A mechanism may be provided. Further, the press roll 3 is provided with a mechanism that can be attached to and detached from the first printing drum 1 and the second printing drum 2, and is operated so as to contact only a portion where a print image area exists.

  Here, a method for using the heat-sensitive stencil printing apparatus for corrugated cardboard sheets of the present embodiment configured as described above, that is, a work procedure of the heat-sensitive stencil printing method for corrugated cardboard sheets of the present embodiment will be described.

  First, the corrugated cardboard sheet 9 is set in the corrugated cardboard sheet feeding unit 4 and the print design is input with the image processing software for the first print drum 1 and the second print drum 2. And calibrate the printing position.

  Thereafter, by making a plate making command, the old plates of the first printing drum 1 and the second printing drum 2 are automatically discharged, and a new plate on which a print image is formed by the thermal head 8 is automatically set to the first plate. The printing drum 1 and the second printing drum 2 are made to plate.

  After the idling rotation is performed for a predetermined time (for example, 30 seconds) so that the printing ink permeates the plate well, one print for print image confirmation is performed. After confirming the print position, print density and print design, and entering the number of prints and print speed, press the print start button to start printing.

  Then, after the printing of a predetermined number of sheets is completed, the printed cardboard sheet 9 is processed into a cardboard case by a box making machine, and is packed with a string every ten sheets, and a printed cardboard case is completed. In addition, when printing on 4 sides or printing with 2 colors, after printing once, printing is performed once again, and thereafter the box is manufactured in the same manner.

  According to the heat-sensitive stencil printing apparatus for corrugated cardboard and rough paper of the present invention, the heat-sensitive stencil sheet can be printed at a low cost even in a small lot, and can be produced in a short time and at a low cost and can be easily discarded. Adopting the stencil method, a uniform and flat image can be obtained even when printing on corrugated cardboard or rough paper having a rough surface, which can cause irregularities on the surface, and it is difficult to cause initial printing defects.

1 ... 1st printing drum,
2 ... second printing drum,
3 ... press roll,
4 ... Corrugated cardboard sheet feeding unit,
5: Corrugated cardboard sheet discharge unit,
6 ... heat-sensitive stencil paper,
7: Plate making part,
8 ... Thermal head,
9: Corrugated cardboard sheet.

Claims (4)

A plurality of printing drums wound with heat-sensitive stencil paper and installed in series and / or in parallel with the direction of the rotation axis;
A slide mechanism capable of moving at least one of the plurality of printing drums in the rotation axis direction;
Including,
A heat-sensitive stencil printing apparatus for corrugated cardboard sheets.   2. The thermal stencil printing for corrugated cardboard sheets according to claim 1, wherein an outer diameter of a printed image portion is larger than an outer diameter of a non-printed image portion when viewed from the rotation axis direction in the printing drum. apparatus. A plurality of printing drums around which heat-sensitive stencil paper is wound are installed in series and / or in parallel to the direction of the rotation axis;
Moving at least one of the plurality of printing drums in the direction of the rotation axis to adjust the printing position;
Printing on the cardboard sheet,
A heat-sensitive stencil printing method for corrugated cardboard sheets.   4. The thermal stencil printing for corrugated cardboard sheets according to claim 3, wherein an outer diameter of the printed image portion is larger than an outer diameter of the non-printed image portion when viewed from the rotation axis direction in the printing drum. Method.

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