JP3934994B2 - Scraper for printing - Google Patents

Description

【００４９】
この結果より、本発明の好適範囲外のＮｏ１はジルコニア製セラミックスの板状体の厚みが０．０２ｍｍで薄く欠けや割れが発生し、結果としてスジが発生した。Ｎｏ３およびＮｏ８はねじれ角度が１８゜と１５゜で角度がきつく、貼り着け時の不可でやはり欠けや割れが発生し、結果としてスジが発生した。Ｎｏ６およびＮｏ９はねじれ角度が２゜と０゜で角度が不十分であり、高速回転に掻き取り効率が追いつかず、結果的にムラが発生した。Ｎｏ１３及びＮｏ１４はジルコニア製セラミックスの板状体の厚みＴが０．２３ｍｍと０．３０ｍｍで厚すぎる為に金属のスパイラル状の溝に添って一様に貼り着けることが困難となり、隙間やクラックが発生し、結果としてスジが発生した。また、本発明の範囲外であるＮｏ１５とＮｏ１６は厚みＴ＝０．１５ｍｍのＳＫＤの金属ブレードを用いたが、何れも寿命が短く頻繁に取り替えが必要となることがわかり、Ｎｏ１５はねじれ角度も０゜であることから、ムラの発生もあった。よって本発明の範囲外のものは掻き取り状態が悪く高速印刷時に適応できないことがわかる。
【００５０】
（実験例２）
表２については、本発明の金属製シャフトに連接する円柱体の外周側面に形成したスパイラル状の溝加工を施したものに板状体のジルコニア製セラミックスを貼り付けた構造において、貼り付けるジルコニア製セラミックスの厚みＴが０．１０ｍｍで、ねじれ角度が１０゜に統一された条件下で、それぞれの上記板状体の刃先が円柱体の外周側面に形成したスパイラル状の溝の最外周面より突出する量と、当該板状体の幅、および刃面の表面粗さをそれぞれ条件を組み合わせ比較したもので、掻き取り性能と寿命評価についてまとめたものである。
【００５１】
【表２】

【００５２】
この結果より、本発明の範囲外のＮｏ１は円柱体の外周側面に形成したスパイラル状の溝の最外周面からの突出量が０で全くなく、インキを掻き取る際の僅かなたわみが全く得られず、またジルコニア製セラミックスの板状体とスパイラル状の溝の最外周面との間に僅かな隙間ができ、結果的にインキの逆流が発生した。
また、本発明の好適範囲外のＮｏ４およびＮｏ８はジルコニア製セラミックの板状体の幅が０．８ｍｍと０．７ｍｍで浅いために、板状体底面に溜まったインキが高速回転時の遠心力などで逆流することにより、結果的にムラが発生した。Ｎｏ７はジルコニア製セラミックスの板状体の刃部の表面粗さＲａが０．２５μｍで粗いため掻き取り時の摺動抵抗が大きくなり、欠けや割れが発生すること、または摺動熱による高温化により熱劣化（相変態）が発生し、クラックが発生し、結果的にスジが発生した。
【００５３】
Ｎｏ１２およびＮｏ１３は円柱体の外周側面に形成したスパイラル状の溝の最外周面からの突出量が０．６ｍｍと０．８ｍｍで多過ぎるため、Ｎｏ１２で接着外れによるムラの発生およびＮｏ１３ではたわみに耐えきれない為に欠けや割れが発生し、結果的にスジが発生した。よって本発明の範囲外のものは掻き取り状態が悪く高速印刷時に適応できないことがわかる。
【００５４】
【発明の効果】
以上記述したように、本発明によれば、円柱体の外周側面にスパイラル状の溝を備え、該溝のエッジ部に形成した刃先で印刷時のインキ等を掻き取るようにしたスクレーパであって、少なくとも上記刃先をジルコニア製セラミックスで形成したことによって、長寿命化が可能となり、かつ、高速印刷下でも均一にムラ無く安定して掻き取ることが可能となる。
【図面の簡単な説明】
【図１】 本発明の印刷用掻き取りスクレーパを示しており、（Ａ）は概略側面図、（Ｂ）は概略断面図、（Ｃ）は概略拡大部分断面図、（Ｄ）は板状体のさまざまな形態を示す側面図、（Ｅ）は刃先の拡大図である。
【図２】 本発明の印刷用スクレーパを用いて版面のインキを掻き取る状態を示す概略側面図である。
【図３】 （Ａ）（Ｂ）は従来の印刷用掻き取りブレードを示す側面図である。
【図４】 従来の印刷用掻き取りスクレーパを用いた版面の印刷インキを掻き取る状態を示す概略側面図である。
【符号の説明】
１：スクレーパ
２：板状体
２ａ、１１ａ：刃先
３：シャフト
３ａ：円柱体
ａ、ｂ、ｃ、ｄ：板状体２の刃先２ａの形状
Ｔ：板状体２の厚み
Ｗ：板状体２の幅
P：突出量
α：溝のねじれ角
β：掻き取り部の刃先２ａの角度
δ：面粗さＲａ０．２μｍ以下の範囲
θ：溝（板状体２）間のピッチ角度
５、１５：圧胴
６、１６：インキ供給槽
７、１７：インキ
８、１８：版胴
９、１９：被印刷体
１０：外周側面に形成したスパイラル状の溝
１１：スクレーパブレード
２０：保持機構[0001]
BACKGROUND OF THE INVENTION
The present invention, when scraping magazines and food bags, or scraped off the printing-in key from the plate surface when printing, such as the pattern of the building materials and floor coverings, the excess coating material at the time of coating to the duct tape or aluminum foil, etc. It is related with the scraper used for.
[0002]
[Prior art]
Conventionally, in curved surface printing, commonly called gravure printing, pad printing, etc., an intaglio printing plate formed by processing a concave pattern on the surface of a plate material made of steel, copper, zinc, synthetic resin, etc. after flushing the print-in key to the plate, scraped excess in key on the plate surface using a scraping scraper blade, is adapted to transfer, directly or indirectly the substrate in-key recess the picture.
[0003]
As shown in the schematic side view of FIG. 4, while contacting the scraper blade 11 to the plate cylinder 18 of the intaglio printing plate is moved in the scraping direction indicated by the arrow, scraping excess printing in key 1 7 of the plate cylinder 18 Is. Here, the holding mechanism 20 is made of metal such as tool steel or carbon steel. The plate cylinder 18 is chrome-plated so as not to be scraped off and worn by the metal scraper blade 11.
[0004]
Here, the ink supply tank 16 is a tray for supplying the ink 17 to the plate cylinder 18 and is devised so that a constant amount of liquid can be stored so that the ink 17 does not run out.
[0005]
The impression cylinder 15 plays a role of pressing the printing medium 19 against the plate cylinder 18 with a constant pressure and transferring the ink 17 from the printing cylinder 18 to the printing medium 19.
[0006]
As the scraper blade 11 used at this time, the one shown in the side view of FIG. 3 is known. As for the shape of the conventional metal scraper blade 11, those having a blade at the tip and those without a blade, or those having a ceramic coating or hard chrome plating treatment on the surface thereof are used.
[0007]
That is, the scraper blade 11 without a blade shown in FIG. 3A is made of a thin steel plate or stainless steel. A scraper blade 11 with a blade shown in FIG. 3B is made of the same material, and has a thin knife edge and a very sharply cut blade edge 11a. The large deflection of 11a realizes the speed of familiarity with the plate surface and good scraping.
[0008]
The blade edge 11a is made of a thin steel plate, a steel composite coated with a ceramic composite material, a hard chrome plated finish, a surface layer coated with diamond, or a resin.
[0009]
On the other hand, for the purpose of preventing initial wear of the scraper blade edge, the metal scraper blade 11 having a thin ceramic film having a thickness of 1 to 20 μm is also made. In recent years, a scraper blade 11 made of a zirconia sintered body has been studied (see Japanese Patent Publication No. 3-21348).
[0010]
[Problems to be solved by the invention]
However scraper blade 11 which is hard chromium plating to steel scraper blade 11 and the metal which has been used conventionally, in such when using the plate cylinder 18 carved in speed and total surface of the printing life It is extremely short. It is not uncommon to replace the scraper blade 11 once a day, and a great deal of time is spent on the color tone check of the printing medium 19 each time.
[0011]
In recent flexographic printing, such as those sprayed chromium oxide on the surface of the plate cylinder 18 and also appeared, although advances in the life of the plate cylinder 18, the life of the scraper blade 11 is not caught up with this no of it is the current form.
[0012]
The plate cylinder 18 is chrome-plated so as not to be scraped off and worn by the metal scraper blade 11. However, in recent years, the plate cylinder 18 is rotated at a high speed due to high-speed printing and water-solubility of the ink 17. However, there are not a few printing troubles that may occur because the durability of the scraper blade 11 is low in order to increase the pressing force of the scraper blade 11.
[0013]
On the other hand, the scraper blade 11 formed with the ceramic coating is slightly more durable than the conventional scraper blade 11, but the base material itself is a steel plate similar to the conventional one, and therefore has only a slight effect on the initial wear, and is remarkable. It is not durable.
[0014]
Further, scraper blade 11 made of zirconia ceramics is excellent in general wear and sliding properties, but the entire scraper blade 11 is obtained by forming zirconia ceramic, breakage or previous end due to the deflection of the blade There were problems such as chipping. In addition, since the cutting edge 11a of the scraper blade 11 made of zirconia ceramic is generally polished in the longitudinal direction by a surface grinder, fine chipping and chipping occur, thereby causing ink scraping unevenness. There is a problem of affecting the print medium.
[0015]
The present invention was made in consideration of the above problems, and its object is to extend the life of the rolls to provide a long fast adaptable printing scraper of Ban Ikotobuki life, prevent printing troubles.
[0016]
[Means for Solving the Problems]
The printing scraper of the present invention is a printing scraper provided with a spiral groove on the outer peripheral side surface of a cylindrical body, and scraping off ink and the like at the time of printing with the blade edge formed in the groove part. A zirconia ceramic plate was fixed to the groove by protruding from the outer peripheral side surface of the cylindrical body.
Moreover, the scraper for printing of this invention shall have formed the said blade edge | tip with the plate-shaped body of the ceramics made from zirconia of thickness 0.03-0.2 mm .
[0017]
Further, the blade edge of the plate-like body is 0 . 1 to 0 . It protrudes 5 mm and the width of the plate-like body is 1 . 0 mm or more and the surface roughness of the cutting edge surface is Ra0 . The thickness was 2 μm or less.
[0018]
As a result, the ink can be scraped cleanly, and even under high-speed printing , a long life and good scraping can be achieved.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0020]
Scraper 1 to the present invention shown in FIG. 1 (A) ~ (C) is a cylindrical body 3 a which is connected to a shaft 3 made of steel or stainless steel material, grooves are spiral processed into twist angle of the groove α 3b, a zirconia ceramic plate 2 processed into a thin plate shape in the groove 3b is fixed with an adhesive using an epoxy adhesive or the like, and the blade edge 2a is projected from the side surface. . Further, the blade edge 2a of the plate-like body 2 is processed so as to be able to slide smoothly with the plate cylinder 8 even at high speed rotation.
[0021]
In the printing scraper 1 of the present invention, the cylindrical body 3a is preferably made of steel or stainless steel, and the twist angle α of the groove of the groove 3b provided on the outer peripheral side surface is preferably in the range of 3 to 13 °. By adhering and fixing the zirconia ceramic plate 2 to the groove 3b using an epoxy adhesive or the like, the blade edge 2a can be formed in a spiral shape. performing scraping such as in key by causing abutment. Thus printing scraper 1 made of the cutting edge of zirconia ceramics which are formed in a spiral shape is also possible to correspond to high-speed rotation of the plate cylinder 8 caused during high-speed printing, there is an effect of scraping evenly clean-in key, etc. In addition, it has high wear resistance.
[0022]
Here, zirconia to that 3 to 13 ° twist angle α of the groove is not obtained the take comes up uneven effect of suppressing the generation by the rotation of the scraper 1 is less than 3 °, processed into 13゜Wo is exceeded and thin The ceramic plate-like body 2 cannot withstand the repulsive stress of torsion along the groove 3b formed on the outer peripheral side surface of the cylindrical body 3a processed into a spiral shape, and peels off immediately after being attached, or the plate-like shape of zirconia ceramic and there is a Re emesis the body 2 itself is broken.
[0023]
Further, it is preferable that the thickness T of the plate-like body 2 is thinned to 0.03 to 0.2 mm, and the surface roughness of the blade edge 2a is set to Ra 0.2 μm or less.
[0024]
Here, the reason why the thickness T of the zirconia ceramic plate-like body 2 is set to 0.03 to 0.2 mm is that when the thickness is less than 0.03 mm, the strength is not maintained, and the chipping or cracking occurs immediately. , and the other hand, because it is impossible to twist the 0.2mm ultra Ell and easily spiral thickness, it is difficult to bond without gaps along the spiral groove 3b formed on the outer peripheral side surface of the cylindrical body 3a Because it becomes.
[0025]
Here, the shape of the blade edge 2a of the plate-like body 2 can be various shapes as shown in FIG. Starting from the left side of the drawing, the simplest rectangular shape with a blade angle β of 90 ° is excellent in preventing chipping during scraping, making manufacturing easier, and making the blade angle more acute. By increasing the scraping efficiency, by conversely making the cutting edge angle obtuse, or by making the cutting edge into an arc shape similar to the outer peripheral surface of the cylindrical body, the slidability with respect to the plate cylinder 8 is maximized, The life can be extended.
[0026]
If the blade edge angle β is smaller than 80 °, it tends to bite into the plate cylinder 8 and, as a result, the chip tends to increase. Therefore, it is preferable to set the blade edge angle to 80 ° or more. Since the scraping effect is poor, the blade edge angle β is preferably in the range of 80 to 110 °.
[0027]
Further, the protruding amount p is preferably 0.1 to 0.5 mm from the spiral groove 3b formed on the outer peripheral side surface of the cylindrical body 3a by the blade edge 2a of the plate-like body 2, and the width W of the plate-like body 2 is 1. 0.0 mm or more is preferable.
[0028]
Here, when the protrusion amount p of the blade edge 2a of the plate-like body 2 is less than 0.1 mm, the spiral deflection along the rotation shaft is not obtained, and it is difficult to fit the surface of the plate cylinder 8, so that the ink scraping is not performed. When the ink is removed, the ink 7 partially accumulates or leaks, thereby causing unevenness of scraping.
[0029]
When the projection amount p conversely obtain ultra the 0.5 mm, flexure increases the tip, when pressed against the plate cylinder 8, rehearsal destination 2a portion plate-like body 2 is out that adheres and fixes a fine Chipping and chipping will cause large cracks and scraping will not be possible.
[0030]
The protruding amount p is set to 0.1 to 0.1 when the protruding cutting edge 2a of the zirconia ceramic plate 2 fixed to the groove 3b is polished by a cylindrical grinder or a universal grinder. It can be obtained by adjusting to 5 mm.
[0031]
The scraper 1 has a blade tip 2a protruding at the tip thereof to generate a screw-like deflection due to a pressing force while rotating the plate tip 8 to the plate cylinder 8. At the same time, the scraper 1 can be satisfactorily scraped with good uniformity. Even for the fine waviness of the surface of the cylinder 8, the generation of the deflection enough to absorb this is obtained. At this time, by the cutting edge 2a protrudes above range, bending is possible is good good scraping occurs.
[0032]
Further, the larger the protrusion amount p, the easier it is to adapt to the plate cylinder 8, but on the other hand, the thickness of the zirconia ceramic plate-like body 2 that needs to be twisted along the spiral shape is extremely 0.03-0.2 mm. It is necessary to make it thin, and it is extremely easy to break. Therefore, the plate- like body 2 can be prevented from being damaged by setting the protruding amount p in the range of 0.1 to 0.5 mm.
[0033]
The width W of the plate-like body 2 is set to 1.0 mm or more. If the width is less than 1.0 mm, the scraped ink 7 is not slid and formed on the outer peripheral side surface of the cylindrical body 3a by centrifugal force or surface tension. It was the accumulated it in the vicinity of the blade surface of the spiral groove 10, in key flows back to the plate cylinder 8 in such scattering is because defects specks unevenness occurs.
[0034]
Moreover, a high sliding surface can be obtained by setting the surface roughness of the blade edge 2a to 0.2 μm or less, and it can be suppressed to extremely low friction even when the plate cylinder 8 is rotated at a high speed accompanying the speed-up of the substrate 9 to be printed. high speed is possible, yet the plate cylinder 8 also can be realized both long life of the security and the cutting edge 2a and the plate cylinder 8 of excellent sliding ready hard to abrading.
[0035]
In the conventional metal scraper blade 11, wear is fast minute, but familiar to the plate cylinder 18 has resulted in a fast good scraping action, by simply changing the material in the scraper blade made of zirconia ceramics, length While having a life characteristic, it also has the disadvantage that it is difficult to fit into the plate cylinder 18 and that it is easily chipped. Familiarity here means an event in which fine chipping or chipping at the tip of the scraper blade 11 is worn and the entire surface of the plate cylinder 18 can be scraped off satisfactorily.
[0036]
That is, conventionally, it has been affected by small chipping and chipping generated by polishing.
[0037]
The contact surface of the plate cylinder 18 and the scraper blade 11 is considered to be a line contact having a width of several tens to several hundreds of μm. However, the rotational direction of the plate cylinder 18 and the processing lines by the conventional surface grinder are in the vertical direction, However, the same scraping streak always occurs when fine chipping or chipping occurs.
[0038]
In contrast, in the scraper 1 of the present invention, the zirconia ceramics cutting edge 2a is provided with a finishing below the surface roughness Ra0.2μm for scraping in key 7 such as a plate-like body 2 of the cylindrical body 3 a By providing a spiral so that the twist angle α of the groove is 3 to 13 ° on the outer peripheral side surface, the scraper 1 itself rotates and slides in a spiral shape even if fine chipping or chipping is present on the surface of the blade edge 2a. in order to scrape the in-key 7 and the like, it is possible to eliminate the occurrence scraping non-uniformity in the same location.
[0039]
Here, the portion where the surface roughness Ra is 0.2 μm or less is within the range of δ of the blade edge 2a shown in FIG. This range becomes a portion that slides directly on the plate cylinder 8, and becomes a portion that is ejected after ink or the like is scraped off indirectly.
[0040]
Here, the surface roughness of the cutting edge 2a and the following Ra of 0.2 m is Exceeding Ra of 0.2 m, a contact surface with the plate cylinder, or become the resistance prompts the occurrence of increased and chipping and chipping , the high speed printing corresponding time due to the generation of frictional heat of the sliding surface, causing the material phase transformation of zirconia ceramics constituting the cutting edge 2a, the end of the strength deterioration, because cracked.
[0041]
Next, when the scraper 1 is used, as shown in the schematic side view of FIG. 2, the tip of the scraper 1 contacts the plate cylinder 8 of the intaglio printing plate while rotating the shaft 3 of the scraper 1 in the direction of the arrow. is rotated in the direction of the arrow while, the plate cylinder 8 surface the tip of the scraper 1 scrapes excess printing in key 7 over plate cylinder 8 on the slide surface pressure by the rotation movement.
[0042]
In addition, the preferable rotation speed which actually rotates the scraper 1 of this invention is r. p. 15-80 is good in m (the number of rotations per minute). When the rotational speed is slow, the remaining ink etc. in the plate cylinder 8 tends to be thick and waste of ink tends to increase. On the other hand, even if the rotational speed is too fast, the agglomerated portion of ink and the like is efficiently removed at the time of scraping. can not, from the fact that eventually there is a tendency that the occurrence of spots or unevenness comes out, the rotation number r. p. m is preferably 15 to 80.
[0043]
Moreover, the preferable range of pitch angle ( theta ) between the grooves (plate-like body 2) between the groove parts 3b shown in FIG.1 (B) related to scraping efficiency is 45 degrees or less. In other words, this is also expressed by the number of the groove portions 3b of the scraper 1. 45 ° corresponds to eight, and preferably has eight or more groove portions 3b, and in particular, the manufacturing cost is preferably up to twelve. The groove portion 3b below 8, the same aggregation point of the ink such as can not be effectively removed, resulting in the occurrence of spots or unevenness coming appears is coming adverse out tend too early the rotational speed.
[0044]
Here, the ink supply layer 6 in pan for supplying the ink 7 in the plate cylinder 8, are devised to so that Re et accumulated a certain amount of liquid as the ink 7 is not insufficient. The impression cylinder 5 plays a role of pressing the printing medium 9 against the plate cylinder 8 with a constant pressure and transferring the ink 7 from the printing cylinder 8 to the printing medium 9.
[0045]
Next, the processing method of the plate-like body 2 and its blade edge 2a will be briefly described. Since the plate-like body 2 has a thickness of 0.03 to 0.2 mm, a width of 1.0 mm or more, a length of about 350 mm to 1000 mm, and an extremely long and narrow shape, a zirconia produced by an extrusion molding method and a tape molding method is required. obtained by grinding the the manufacturing ceramics those baked for 1 hour hanging baked at 1400 ° C. in a firing furnace batch atmospheric air at a surface grinder. Grinding is performed with a # 200 diamond tool in the length direction and finished to a thickness of 0.03 to 0.2 mm, and the width of the surface of the blade edge 2a is determined # 800 in the length direction. Surface roughness and size of Ra 0.2 μm or less can be formed by grinding with the above diamond tool. The extra length can be processed by slicing.
[0046]
【Example】
(Experimental example 1)
Table 1 compares several conditions of the structure in which a plate-like zirconia ceramic is pasted on a spiral groove formed on the outer peripheral side surface of a cylindrical body connected to the metal shaft of the present invention. It summarizes the scraping performance and life evaluation at what was pasted plate body of SKD material to zirconia ceramics and the invention structure of the conventional structure as an example.
[0047]
In order to unify the sliding conditions for any blade edge, the surface roughness is set to Ra0 . 01-0 . Processing was performed within the range of 03 μm.
[0048]
[Table 1]

[0049]
From this result, the preferred range of No1 of the present invention the thickness of the zirconia ceramics of the plate-like body is chipping or cracking occurs thinly 0.02 mm, streaks occurred as a result. In No. 3 and No. 8, the twist angles were 18 ° and 15 °, and the angles were tight, and when they were stuck, cracks and cracks were generated, resulting in streaks. In No. 6 and No. 9, the twist angles were 2 ° and 0 °, and the angles were insufficient, and the scraping efficiency could not catch up with high-speed rotation, resulting in unevenness. No13 and No14 becomes difficult pasted uniformly along the metallic spiral groove for the thickness T of zirconia ceramics of the plate is too thick at 0.23mm and 0.30 mm, gaps or cracks As a result, streaks occurred. Moreover, although No15 and No16 which are outside the scope of the present invention used SKD metal blades with a thickness T = 0.15 mm, it was found that both had a short life and required frequent replacement. Since it was 0 °, unevenness occurred. Therefore, outside the scope of this onset bright it can be seen that that can not be adapted to the time of high-speed printing poor scraping state.
[0050]
(Experimental example 2)
As for Table 2, in the structure in which the plate-like zirconia ceramics are pasted on the spiral groove formed on the outer peripheral side surface of the cylindrical body connected to the metal shaft of the present invention, the zirconia ceramics to be pasted The ceramic thickness T is 0 . 10 mm and under the condition that the twist angle is unified to 10 °, the amount of the blade edge of each plate-like body protruding from the outermost circumferential surface of the spiral groove formed on the outer circumferential side surface of the cylindrical body, This is a comparison of the body width and the surface roughness of the blade surface in combination with each other, and summarizes scraping performance and life evaluation.
[0051]
[Table 2]

[0052]
This result, No1 outside the scope of the present invention is the projection amount from the outermost surface of the spiral-shaped groove formed on the outer peripheral side surface of the cylindrical body without any zero, quite slight deflection when scraping the in-key not obtained, also can slight gap between the outermost surface of the plate-like body and spiral grooves of zirconia ceramics, backflow of consequently-in key is generated.
In order No4 and No8 outside preferable range of the present invention is shallow in width 0.8 mm and 0.7 mm made of zirconia ceramic of the plate-like body, when in key high-speed rotation accumulated in the plate-like body bottom As a result, non-uniformity occurred due to reverse flow caused by centrifugal force. No7 rough for scraping during sliding resistance increases at 0.25μm surface roughness Ra of the blade portion of the plate-like member made of zirconia ceramics, the chipping or cracking occurs, or high temperature caused by sliding heat Caused thermal degradation (phase transformation), cracks, and streaks.
[0053]
In No12 and No13, the amount of protrusion from the outermost peripheral surface of the spiral groove formed on the outer peripheral side surface of the cylindrical body is too large at 0.6 mm and 0.8 mm. Since it could not withstand the deflection, chipping and cracking occurred, resulting in streaks. Therefore, outside the scope of this onset bright it can be seen that that can not be adapted to the time of high-speed printing poor scraping state.
[0054]
【The invention's effect】
As described above, according to the present invention, comprises a spiral groove on the outer peripheral side surface of the cylindrical body, a scraper which is adapted to scrape the printing time of the in-key or the like with the cutting edge formed on an edge portion of the groove By forming at least the above-mentioned cutting edge with zirconia ceramics, it is possible to extend the life, and to scrape evenly and uniformly even under high-speed printing.
[Brief description of the drawings]
1A and 1B show a scraping scraper for printing according to the present invention, in which FIG. 1A is a schematic side view, FIG. 1B is a schematic cross-sectional view, FIG. 1C is a schematic enlarged partial cross-sectional view, and FIG. The side view which shows various forms of (E) is an enlarged view of a blade edge | tip.
2 is a schematic side view showing a state where the scraping-in key of the plate surface using the printing scraper of the present invention.
FIGS. 3A and 3B are side views showing a conventional scraping blade for printing. FIGS.
4 is a schematic side view showing a state in which scraping the printing-in key conventional scraping scraper plate surface using for printing.
[Explanation of symbols]
1: Scraper 2: Plate
2a, 11a: cutting edge
3: Shaft
3a: cylindrical bodies a, b, c, d: shape of the cutting edge 2a of the plate-like body T: thickness of the plate-like body 2 W: width of the plate-like body 2
P: protrusion amount α: twist angle of groove β: angle of cutting edge 2a of scraping portion δ: range of surface roughness Ra of 0.2 μm or less θ: pitch angle between grooves (plate-like body 2 ) 5, 15: impression cylinder 6,16: ink supply tank 7, 17: ink 8,18: the plate cylinder 9 and 19: the printing material 10: spiral groove formed on the outer peripheral side surface
11: Scraper blade 20: Holding mechanism

Claims (3)

Includes a spiral groove on the outer peripheral side surface of the cylinder, a printing scraper you scrape in-key or the like at the time of printing at the cutting edge formed on the groove, the upper Symbol cutting edge, the cylinder in the groove A scraper for printing, characterized in that it is formed by protruding from the outer peripheral side surface of the body and fixing a plate-like body made of zirconia ceramics. Printing scraper of claim 1, wherein the plate-like member made of zirconia ceramic thick 0.03~0.2mm in, characterized in that the formation of the blade edge. The width of the plate-like body is 1.0 mm or more, and the blade edge protrudes 0.1 to 0.5 mm from the outer peripheral side surface of the cylindrical body, and the surface roughness of the blade edge is Ra0 . 3. The printing scraper according to claim 2, wherein the printing scraper is 2 [mu] m or less.

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