JP6120081B2 - Squeegee mechanism for rotary screen printing - Google Patents

Description

  The present invention relates to a rotary screen printing machine, and more particularly to a rotary screen printing squeegee mechanism for controlling an ink retention amount on a squeegee mechanism.

  In general, screen printing is performed by forming through-holes through which ink passes and non-through-holes through which ink does not pass on the plate surface, and extruding the ink with a squeegee and transferring it to a printing material.

  Screen printing is characterized by the fact that the printing surface is flexible and the printing pressure is very low, and the ink film is thicker than other plate types, so the material of the printed material can be freely selected and a printed material with braille and other features is obtained. It is widely known as one of printing methods. In addition, as the shape of the plate surface, there are a flat type using a flat plate surface and a rotary type using a cylindrical plate surface, and rotary screen printing can print a continuous pattern on a web.

  An apparatus using rotary screen printing is also referred to as a rotary screen printer, and has a paper feeding unit, a printing unit, and a paper discharge unit. The printed materials are sequentially fed by the paper feeding unit and conveyed to the printing unit. The printing material conveyed to the printing unit is pressed by the impression cylinder and the plate cylinder and printed. At this time, the ink is supplied to the plate cylinder by discharging ink from the ink supply means provided in the plate cylinder toward the lower side of the rotating plate cylinder. Further, the ink staying at the lower part of the plate cylinder moves to the uppermost part as the plate cylinder rotates, and the excess ink is pushed into the through hole of the plate cylinder while being scraped off by the squeegee located at this position. Then, the ink pressed into the through hole is transferred to the printing material by pressing the printing material with the impression cylinder and the plate cylinder. Thereafter, the paper is discharged out of the rotary screen printer via a paper discharge unit.

  In screen printing, excess ink is pushed into the through-hole of the plate surface (plate cylinder) while being scraped off by a squeegee, so that the fluidity of the ink greatly affects the printability. Furthermore, the rotary type screen printing can perform high-speed continuous printing as compared with the flat type, but the influence becomes remarkable.

  The present applicant relates to the control of ink fluidity in a rotary screen printing machine, and attaches an ink recovery unit to the lower part of the squeegee and temporarily stores the ink in an ink recovery box in the ink recovery unit across the width direction. Distributing the ink flow rate to a uniform state, and installing a flow adjustment blade that can be opened and closed to the ink collection box, and adjusting the opening degree, the ink flowing out of the ink collection box is kept uniformly dispersed An invention relating to a squeegee mechanism for rotary screen printing that can reach the printing plate as it is has been filed (for example, see Patent Document 1).

  Also, as a means of controlling the fluidity of the ink for pushing an appropriate amount of ink into the through hole of the screen plate surface, a concave portion is formed at the corner between the opposing surface facing the screen plate of the squeegee and the front surface in the traveling direction. A squeegee for a screen printing machine is disclosed that eliminates variations in the printing state by forming and suppressing the ink rolling in the recesses to a small and constant size (see, for example, Patent Document 2).

In recent years, high-definition printed image lines are required for screen printing. Note that a high-quality printed image line has a line width of 80 μm to 500 μm and a line interval of 30 μm to 300 μm. For example, on an image line or pixel with a glossy convex shape, areas with different light reflectivities for incident light from a certain direction are provided, and true / false discrimination that can effectively apply multiple latent images In the latent image printed matter using the excellent gloss difference (JP 2007-106116, JP 2007-262818), the raised height of the convex image line and its shape greatly affect the visibility of the latent image. It is shown.

JP 2011-230388 A JP 2011-079148 A

  However, the squeegee mechanism for rotary screen printing disclosed in Patent Document 1 is for adjusting the ink flow rate to a uniform state in the width direction of the squeegee, and controls the amount of ink retained on the squeegee mechanism. There is a problem that the amount of ink transferred to the substrate is not stable.

  Further, the squeegee for a screen printing machine disclosed in Patent Document 2 has a concave portion formed at the corner of the squeegee, and the ink rolling is suppressed to a small and constant size within the concave portion, thereby eliminating variations in printing state. It does not control the amount of ink retained on the squeegee mechanism, and does not obtain a screen print with high-definition solid lines. Stable quality in long-term high-speed continuous printing such as rotary screen printing. There was a problem that it was difficult to obtain.

  The present invention aims to solve the above-mentioned problems, controls the amount of ink retained on the squeegee mechanism, stabilizes the amount of ink transferred to the substrate, obtains a high-definition screen print, and performs high-speed continuous printing. Improve productivity by enabling printing.

  The squeegee mechanism for rotary screen printing according to the present invention is a squeegee mechanism having a squeegee holder for sandwiching a squeegee and a squeegee supported at least upward with respect to a support in a plate cylinder of the rotary screen printing machine. The squeegee holder has an inclined portion at the tip of the squeegee holder that contacts the ink scraping surface of the squeegee.

  The squeegee mechanism for rotary screen printing according to the present invention is characterized in that the tip inclined angle of the holder inclined portion is in the range of 10 degrees to 60 degrees.

  The squeegee mechanism for rotary screen printing according to the present invention is characterized in that the squeegee angle, which is the angle between the ink scraping surface of the squeegee and the horizontal direction, is in the range of 10 to 40 degrees.

The squeegee mechanism for rotary screen printing according to the present invention includes the squeegee tip point (point A) of the squeegee that is in contact with the inner peripheral surface of the plate cylinder, the holder tilt start point (point B) and the holder tilt end point (point C) of the holder tilting portion. The height with respect to the horizontal direction has the following formula 1.
[Formula 1] C point ≥ A point> B point

  The squeegee mechanism for rotary screen printing of the present invention controls the amount of ink retained on the squeegee mechanism, thereby stabilizing the amount of ink transferred to the substrate and obtaining a high-definition screen print. Further, in long-term high-speed continuous printing, stable quality can be obtained, so that productivity can be improved.

It is a figure which shows an example of the printing part of the rotary screen printing machine in this invention. It is a figure which shows an example of the squeegee mechanism in this invention. It is a figure which shows an example of another form of the holder inclination part in this invention. It is a figure which shows an example of the state which attached the squeegee mechanism in the plate cylinder in this invention. It is a figure which shows an example of the retention and circulation state of the ink on the squeegee mechanism in this invention. It is a figure which shows an example of the printed matter in this invention. It is a figure which shows an example of the retention and circulation state of the ink on the squeegee mechanism in this invention. It is a figure which shows an example of the retention and circulation state of the ink on the squeegee mechanism in this invention. It is a figure which shows an example of the comparison form with the squeegee mechanism in this invention. It is a figure which shows an example of the comparison form with the squeegee mechanism in this invention. It is a figure which shows an example of the comparison form with the squeegee mechanism in this invention.

(First embodiment)

  DESCRIPTION OF EMBODIMENTS Embodiments for carrying out the present invention will be described with reference to the drawings. However, the present invention is not limited to the embodiments described below, and includes various other embodiments within the scope of the technical idea described in the scope of claims.

(Printing department)
FIG. 1 shows an example of the configuration of a rotary screen printing machine according to the present invention. The rotary screen printing machine includes a printing unit (1) as shown in FIG. 1 and also includes a paper feeding unit and a paper discharging unit (not shown). The sheet feeding unit includes a sheet feeding unit and a sheet stacking unit. The sheet feeding unit supplies the printed material from the stacking unit to the printing unit, and the sheet stacking unit stacks the sheet-shaped printed material. The printed materials placed on the sheet stacking unit are fed one by one by the supply unit and conveyed to the printing unit (1).

  The printing unit (1) includes, as a basic configuration, an impression cylinder (2), a plate cylinder (3), a support body (4), a squeegee mechanism (5), and the like. The impression cylinder (2) and the plate cylinder (3) are arranged so as to face each other via the substrate (101). During printing, the impression cylinder (2) is driven to rotate clockwise, so that the plate cylinder (3) Is rotated counterclockwise.

  The impression cylinder (2) is rotatably supported so that the image line portion (103) such as a pattern can be transferred onto the substrate (101) by applying a printing pressure to the substrate (101). It has become. The impression cylinder (2) only needs to be positioned above the plate cylinder (3). “Upward” indicates a range from 0 degrees to 90 degrees in the vertical direction when the center of the plate cylinder (3) is the starting point and the horizontal direction is 0 degrees.

  The plate cylinder (3) has a hollow cylindrical shape with a through-hole (not shown) through which ink passes, and is rotatably supported by connecting the end of the cylinder to a rotating body. Ink (102) is stored in the plate cylinder (3), and the ink (102) circulates counterclockwise in accordance with the rotational drive of the plate cylinder (3), so that excess ink is removed by the squeegee mechanism (5). The ink is transferred to the substrate (101) by scraping and pushing the ink into the through hole, thereby forming the image portion (103).

  As the plate cylinder (3), for example, a lacquer plate surface obtained by processing a plate material obtained by applying a photosensitive film to a mesh woven with metal fibers such as stainless steel into a cylindrical shape, or a cylindrical metal plate surface by electroforming, There are pierced etching plates that form image lines and the like.

  The support (4) is formed of a material that can sufficiently support the load of the ink (102) staying on the squeegee mechanism (5) and the squeegee mechanism (5), and the squeegee mechanism (3) into the plate cylinder (3) ( When the attachment and detachment of 5) is performed, it is sufficient that the end portion is supported.

  Moreover, you may provide the mechanism which a support body (4) drives. For example, the position where the printing pressure is applied can be adjusted by adjusting the support (4) in the direction of the impression cylinder (2) to adjust the squeegee push-in amount or in the vertical direction. Furthermore, the squeegee angle described later can be adjusted by adjusting the rotation axis angle of the support (4).

(Squeegee mechanism)
FIG. 2 is a diagram showing an example of the squeegee mechanism (5) in the present invention. The squeegee mechanism (5) includes a squeegee (6) that scrapes excess ink and pushes in ink, and a squeegee holder (7) that holds the squeegee (6) and controls the amount of ink retained (hereinafter referred to as “holder”). .).

  The squeegee (6) is formed of rubber or metal, and is fixed and installed upward by the support (4) so that the tip abuts against the inner peripheral surface of the plate cylinder (3). ) Is pushed into the through-holes of the plate cylinder (3) (hereinafter referred to as “pushability”) and the excess ink (102) adhering to the inner peripheral surface of the plate cylinder (3) is scraped (hereinafter referred to as “ The shape of the tip may be an arc shape, a rectangle shape, or a sword shape as long as it has “scraping ability”), and is not particularly limited.

  Examples of the material used for the squeegee (6) include resin squeegees such as urethane rubber, ethylene propylene rubber, butyl rubber, nitrile rubber, and silicon rubber, and metal squeegees such as stainless steel.

  The size of the squeegee (6) is such that the horizontal length of the squeegee (6) in FIG. 2 is depth, the vertical length is height, and the length in contact with the plate cylinder (3) in FIG. And Each size can be used in accordance with various printing conditions such as flow characteristics of the substrate (101) and ink (102).

  The squeegee (6) has a squeegee non-clamping portion (8) protruding from the holder (7). By adjusting the length and shape of the squeegee non-clamping portion (8), the scraping property and Pushability can be adjusted.

  The squeegee non-clamping part (8) may be designed to suit the printing conditions, but preferably the length of the squeegee non-clamping part (8) is in the range of 3 mm to 20 mm. If it is 3 mm or less, the holder part may come into contact with the plate surface, and if it is 20 mm or more, the squeegee non-clamping part (8) tends to be formed, and it is easy to be affected by a load due to an ink load or the like, causing a quality defect. Because.

  The holder (7) may be either an integral type or a divided type as long as the squeegee (6) can be securely clamped so as not to loosen during printing, and is not particularly limited. A holder inclined portion (9) and a holder tip portion (10) are provided on the upper portion (ink retention side) of the holder (7), which is a feature of the present invention, and a certain amount of ink is retained and excessive. It is sufficient that the structure does not hinder the flow of ink. Moreover, the holder (7) is fixed by a bolt or the like by including a connecting portion for holding the squeegee mechanism (5) on the support (4).

  In addition, as shown in FIG. 2, the holder inclination part (9) is an inclination angle to a holder inclination end point (14) to be described later when a horizontal direction is set to 0 degree from a holder inclination start point (13) to be described later. It has a certain tip inclination angle (11). The tip inclination angle (11) can be appropriately adjusted according to the length of the squeegee non-clamping portion (8) and the squeegee angle described later, but is preferably in the range of 10 to 60 degrees. This is because if the tip inclination angle (11) is 10 degrees or less, the amount of ink staying is small, and if it is 60 degrees or more, the ink flow may be hindered.

  The holder tip (10) only needs to have sufficient strength to hold the squeegee and has a thickness of 0.1 mm to 8 mm. In order not to inhibit the flow of ink, a thinner one is preferable.

  The squeegee mechanism (5) of the present invention has a squeegee tip point (12) (hereinafter referred to as “point A”) of the squeegee (6) that abuts the inner surface of the plate cylinder (3) when attached to the printing unit (1). , The tilt start point of the holder tilt portion (9) is the holder tilt start point (13) (hereinafter referred to as "B point"), and the tilt end point of the holder tilt portion (9) is the holder tilt end point (14) (hereinafter, It is characterized by having three points, “C point”.

  FIG. 3 is a diagram showing types of shapes of the holder inclined portion (9). Various streamline shapes can be adapted according to printing conditions, ink flow characteristics and the like. The streamlined shape includes, for example, a convex curve shape as shown in FIG. 3A, a concave curve shape as shown in FIG. 3B, a step shape as shown in FIG. The relationship between the point (13) and the C point (14) is within the range of the tip inclination angle (11) in the present invention, and a certain amount of ink is retained and the structure does not hinder excessive ink flow. That's fine.

  FIG. 4 is a view showing an example of a state in which the support body (4) and the squeegee mechanism (5) are mounted in the plate cylinder (3). The squeegee mechanism (5) is attached with a squeegee angle (15) by adjusting the angle by the support (4) or adjusting the installation angle of the holder (7) on the support (4). As shown in FIG. 4, the squeegee angle (15) is a squeegee (6) in the vertical direction when the horizontal direction is 0 degrees starting from the upper corner where the squeegee (6) contacts the holder (7). ). That is, the squeegee angle (15) can be adjusted by adjusting the angle of the squeegee mechanism (5) starting from the support (4). The squeegee angle (15) may be in the range of 0 degrees to 90 degrees in which the squeegee (6) faces upward, but is preferably in the range of 10 degrees to 40 degrees. When the squeegee angle (15) is 10 degrees or less, the ink flow is poor and the load due to poor circulation and ink load on the squeegee increases. When the squeegee angle (15) is 40 degrees or more, the ink does not stay and printing failure occurs. It is.

  FIG. 5 shows a state in the plate cylinder (3) in consideration of the tip inclination angle (11) and the squeegee angle (15) for retaining a certain amount of ink on the squeegee mechanism (5) and circulating excess ink. It is a figure which shows an example. The squeegee mechanism (5) in the present invention always supplies a certain amount of ink to the point A (12) for controlling the pushability and scraping property of the ink in order to print a high-definition three-dimensional image line. It suffices to have a mechanism excluding. Therefore, controlling the ink retention amount in the present invention means that a constant amount of ink is always supplied to point A (12) that controls the indentation and scraping properties of the ink, and excess ink is removed. Specifically, the holder inclined portion (9) is provided at the tip of the squeegee holder (7) in contact with the ink scraping surface of the squeegee (6) on the A point (12) side.

  The squeegee mechanism (5) shown in FIG. 5 is V-shaped or L-shaped so that at least B point (13) is the lowest among point A (12), B point (13), and C point (14). It is characterized by having a structure in which a constant ink is supplied to point A (12) and excess ink circulates beyond point C (14). .

  In addition, a holder guide (not shown) may be attached to both ends of the holder (7) as a weir to prevent the ink from flowing out from both ends on the squeegee mechanism (5). Depending on conditions or the like, ink retention can be assisted by appropriately attaching a holder guide.

(effect)
The effect of the rotary screen printing squeegee mechanism of the present invention will be described with reference to FIG. FIG. 6A is a printed matter obtained by the squeegee mechanism (5) of the present invention. The design values of the design are an image line width of 280 μm and an image line interval of 120 μm. In addition to being able to print high-definition lines uniformly, the ink film thickness is also stable. This is because the amount of ink transferred to the substrate (101) can be stabilized by controlling the amount of ink remaining on the squeegee mechanism (5). In addition, since excess ink circulates in the plate cylinder (3), there is little influence on the quality due to fluctuations in the amount of ink in the plate cylinder (3), and stable quality can be obtained in long-term high-speed continuous printing. Therefore, productivity can be improved.

  FIG. 6B is a printed matter obtained by the squeegee mechanism (5) that does not include the holder inclined portion (9) and the holder tip portion (10) has a thickness equivalent to that of the present invention. The design values of the design are an image line width of 280 μm and an image line interval of 120 μm. Except for the holder (7), printing was performed under the same conditions as in FIG. 6 (a), but the image lines were missing or blurred, and the ink film thickness was not stable. This is because the amount of ink transferred to the substrate (101) becomes unstable due to the lack of the ink retention amount on the squeegee mechanism (5). Details are shown in Comparative Example 1 (FIG. 9).

  FIG. 6C shows a printed matter obtained by the squeegee mechanism (5) that does not include the holder inclined portion (8) and the holder tip portion (10) is thicker than the present invention. The design values of the design are an image line width of 280 μm and an image line interval of 120 μm. Except for the holder (7), printing was performed under the same conditions as in FIG. 6 (a), but the lines were in contact with each other, and the ink film thickness was not stable. This is because an excessive amount of ink stays on the squeegee mechanism (5), so that the amount of ink transferred to the substrate (101) becomes unstable. Details are shown in Comparative Example 2 (FIG. 10).

(principle)
The principle of the squeegee mechanism (5) in the present invention will be described with reference to FIGS. FIG. 5 is a diagram showing the flow of ink by the squeegee mechanism (5). The arrows in the figure indicate the flow direction of the ink (102). In addition, when the A point (12), the B point (13), and the C point (14) in FIG. 5 are expressed by the height in the vertical direction, C point (14) ≧ A point (12)> B point (13) There is a relationship.

  The ink (102) circulating in the plate cylinder (3) is scraped off at the point A (12) and pushed into the through hole. Then, a fixed volume of ink (102) stays in a V shape with the point B (13) at the bottom. Further, excess ink (102) flows through the gentle holder inclined portion (9), passes through the point C (14) which is the apex of the inclination, and circulates again in the plate cylinder (3).

  By repeating these series of actions, a constant amount of ink (102) can always be supplied to point A (12) which controls the indentation and scraping properties of the ink, and stable printing can be performed. .

  In addition, by adjusting the positional relationship between point A (12), point B (13), and point C (14) according to the printing speed, ink flow characteristics, etc., the amount of ink retention is controlled and a high-definition solid image line is obtained. Can be printed continuously. However, it is essential that the point B (13) is at a lower position.

  FIG. 7 shows the relationship of A point (12)> C point (14)> B point (13) when A point (12), B point (13), and C point (14) are represented by vertical height. It is a figure which shows the flow of the ink by the squeegee mechanism in (5). The arrows in the figure indicate the flow direction of the ink (102).

  Since the point C (14) is lower than the point A (12) as compared with the configuration of FIG. 5, the ink retention amount on the squeegee mechanism (5) decreases. When the printing speed is slow or the viscosity of the ink is high, the ink (102) can be appropriately set in the printing conditions where the ink (102) tends to stay on the squeegee mechanism (5).

  FIG. 8 shows point A (12), point B (13), and point C (14) in the vertical direction as in FIG. FIG. 6 is a diagram showing the flow of ink by a squeegee mechanism (5) having a relationship of (13) but having a configuration different from that of FIG. The arrows in the figure indicate the flow direction of the ink (102).

  In the squeegee mechanism (5) shown in FIG. 8, since the restraining plate (16) is used to fix the upper part of the squeegee (6), the holder inclined portion (9) has the staircase shape shown in FIG. Become. The amount of ink retention can be controlled, and high-definition solid lines can be printed continuously. In the present invention, the tip inclination connecting the point B (13) and the point C (14) for controlling the ink retention amount and the circulation of the excess ink within a range in which a high-definition solid line can be continuously printed. The angle (11) may be an acute angle, and the holder inclined portion (9) may have a shape as shown in FIG.

  9, 10 and 11 show an example of the squeegee mechanism (5) which does not include the holder inclined portion (9). The difference will be described in comparison with the squeegee mechanism (5) of the present invention.

  FIG. 9 shows a squeegee mechanism (205) that does not include a holder inclined portion (9) and that has a holder tip (10) having a thickness equivalent to that of the present invention. In the squeegee mechanism (205) shown in FIG. 9, the ink (102) does not stay on the squeegee mechanism (5), and the ink supply to the point A (12) is insufficient. As shown in FIG. Print defects such as chipping or fading of lines occur.

  FIG. 10 shows a squeegee mechanism (205 ') that is not provided with a holder inclined part (9) and the holder tip part (10) is thicker than the present invention. In the squeegee mechanism (205 ′) of FIG. 10, excessive ink (102) stays on the squeegee non-clamping portion (11), and excess ink (102) is supplied to the point A (12). As shown in FIG. 6 (c), contact between the image lines occurs. Further, since the holder tip (10) hinders the flow of the ink (102), poor circulation occurs and it is difficult to perform continuous stable printing.

  11 shows a squeegee mechanism (205 ″) having no holder inclined portion (9) and having a squeegee non-clamping portion (8) longer than the present invention. The squeegee mechanism (205 ″) of FIG. 11 is shown in FIG. Although the ink flow equivalent to that of the squeegee mechanism (5) of the present invention can be reproduced, the squeegee non-clamping part (8) is too long, so that the squeegee non-clamping part (8) is greatly deformed by the load of the ink (102). In addition, printing defects such as image line defects and fading often occur.

  Example 1 relates to a rotary screen printer provided with the squeegee mechanism (5) shown in FIG. The printing apparatus includes a feeder unit, a printing unit, an ultraviolet irradiation unit, and a delivery unit. The printing speed was 80 m / min.

(Printing department)
In the printing unit, a printing mechanism in which the impression cylinder is located above the plate cylinder was used. The squeegee angle was 27.5 °.

(Squeegee mechanism)
The squeegee was urethane rubber (Minoprene, manufactured by Mino Group), and had a depth of 45 mm, a height of 6 mm, and a width of 900 mm. The holder was made of aluminum and used with a tip inclination angle of 30 °, a holder inclined portion length of 10 mm, and a holder tip portion thickness of 3 mm. The length of the squeegee non-clamping part was 10 mm.

(Printing material)
As the ink, an ultraviolet curable ink having a viscosity of 1.0 Pa · s (30 ° C.) was used. The plate cylinder was a lacquer plate made of 150 mesh (line / inch) stainless steel mesh, and the printed design was a line design with an image line width of 280 μm and an image line interval of 120 μm. The base material was high-quality paper with Beck type smoothness of 150 seconds.

As shown in FIG. 6A, the obtained printed matter was able to print a high-definition line uniformly, and the film thickness was also stable. In addition, the circulation of the ink was stable, and there was no change in the quality of printed matter even after continuous printing of 10,000 sheets or more.
(Comparative Example 1)

  Comparative Example 1 relates to a rotary screen printer provided with the squeegee mechanism (5) shown in FIG. The printing apparatus includes a feeder unit, a printing unit, an ultraviolet irradiation unit, and a delivery unit. The printing speed was 80 m / min.

(Printing department)
In the printing unit, a printing mechanism in which the impression cylinder is located above the plate cylinder was used. The squeegee angle was 27.5 °.

(Squeegee mechanism)
The squeegee was urethane rubber (Minoprene, manufactured by Mino Group), and had a depth of 45 mm, a height of 6 mm, and a width of 900 mm. The holder is made of aluminum, and a thickness of 3 mm at the tip of the holder that does not include the holder inclined portion (9) is used. The length of the squeegee non-clamping part was 10 mm.

(Printing material)
As the ink, an ultraviolet curable ink having a viscosity of 1.0 Pa · s (30 ° C.) was used. The plate cylinder was a lacquer plate made of 150 mesh (line / inch) stainless steel mesh, and the printed design was a line design with an image line width of 280 μm and an image line interval of 120 μm. The base material was high-quality paper with Beck type smoothness of 150 seconds.

As shown in FIG. 6B, the obtained printed matter had chipped or blurred lines, and the ink film thickness was not stable.
(Comparative Example 2)

  Comparative Example 1 relates to a rotary screen printer provided with the squeegee mechanism (5) shown in FIG. The printing apparatus includes a feeder unit, a printing unit, an ultraviolet irradiation unit, and a delivery unit. The printing speed was 80 m / min.

(Printing department)
In the printing unit, a printing mechanism in which the impression cylinder is located above the plate cylinder was used. The squeegee angle was 27.5 °.

(Squeegee mechanism)
The squeegee was urethane rubber (Minoprene, manufactured by Mino Group), and had a depth of 45 mm, a height of 6 mm, and a width of 900 mm. The holder was made of aluminum, and a thickness of 10 mm at the tip of the holder was used. The length of the squeegee non-clamping part was 10 mm.

(Printing material)
As the ink, an ultraviolet curable ink having a viscosity of 1.0 Pa · s (30 ° C.) was used. The plate cylinder was a lacquer plate made of 150 mesh (line / inch) stainless steel mesh, and the printed design was a line design with an image line width of 280 μm and an image line interval of 120 μm. The base material was high-quality paper with Beck type smoothness of 150 seconds.

  In the obtained printed matter, as shown in FIG. 6C, contact between the image lines occurred, and the ink and the film thickness were not stable. In addition, phenomena such as unstable ink circulation and changes in the quality of printed matter for each printed matter appeared.

DESCRIPTION OF SYMBOLS 1 Printing part 2 Impression cylinder 3 Plate cylinder 4 Support body 5 Squeegee mechanism 6 Squeegee 7 Holder 8 Squeegee non-clamping part 9 Holder inclination part 10 Holder tip part 11 Tip inclination angle 12 Squeegee tip point (A point)
13 Holder tilt start point (point B)
14 Holder tilt end point (point C)
15 Squeegee Angle 16 Suppressing Plate 101 Printed Material 102 Ink 103 Image Lines 205, 205 ′, 205 ”Squeegee Mechanism for Comparison

Claims (3)

In a squeegee mechanism having a squeegee holder that holds the squeegee sandwiched between a squeegee fixed upward and supported by a support so that the tip abuts against the inner peripheral surface of the plate cylinder in the plate cylinder of the rotary screen printing machine,
The squeegee holder has a squeegee holder for rotary screen printing having a holder inclined portion with a tip inclination angle of 10 degrees to 60 degrees at the tip of the squeegee holder in contact with the ink scraping surface of the squeegee. . The squeegee mechanism for rotary screen printing according to claim 1 , wherein a squeegee angle, which is an angle between the ink scraping surface of the squeegee and a horizontal direction, is in a range of 10 degrees to 40 degrees. The height with respect to the horizontal direction of the squeegee tip point (A point) of the squeegee that contacts the inner peripheral surface of the plate cylinder, the holder tilt start point (B point) and the holder tilt end point (C point) of the holder tilt part is as follows. rotary screen printing squeegee mechanism according to any one of claims 1 or 2, characterized in that it comprises an expression 1.
[Formula 1] C point ≥ A point> B point

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