Scraping unit, printing apparatus and coating apparatus

Abstract

To provide a scraping unit, printing apparatus, and coating apparatus that can suppress chipping of the doctor blade on the scraping unit side without making any structural changes to the gravure roll side. [Solution] The scraping unit 10 has a blade 1, an auxiliary member 2 attached to the blade 1, and a holder 3 for the blade 1. The auxiliary member 2 is configured to reduce the pressing force applied to a part of the blade 1, and by bringing the blade 1 into contact with the roll member 101, it removes the material adhering to the roll member 101.

Claims

1. In a printing apparatus that presses a doctor blade against a gravure roll to scrape off a portion of the printing ink transferred from the gravure roll to the substrate, the apparatus is equipped with a blade holder that holds and secures the doctor blade, and a backing plate is provided between one or both sides of the doctor blade and the blade holder so that the doctor blade is pressed uniformly against the gravure roll, A printing apparatus characterized in that the backing plate is positioned such that the pressure of the doctor blade at the width end of the gravure roll is weaker than the pressure of the doctor blade at other points in the gravure roll.

2. The printing apparatus according to claim 1, characterized in that a notch is provided in the backing plate at a width position corresponding to the width end of the gravure roll, so that the pressure of the doctor blade at the width end of the gravure roll is weaker than the pressure of the doctor blade at other points.

3. The printing apparatus according to claim 1, characterized in that the backing plate on the outer side from the width end of the gravure roll is shortened in the direction from the blade holder toward the gravure roll, so that the pressure of the doctor blade at the width end of the gravure roll is weaker than the pressure of the doctor blade elsewhere.

4. The printing apparatus according to claim 1, characterized in that the backing plate, which is narrower than the gravure roll, is positioned inside the entire width of the gravure roll, so that the pressure of the doctor blade at the width end of the gravure roll is weaker than the pressure of the doctor blade at other points on the gravure roll.

5. The printing apparatus according to claim 1, characterized in that the backing plate is positioned at a width position corresponding to the outer edge of the gravure roll from the width end of the gravure roll, with the backing plate being made of a material whose modulus of elasticity is lower than that of the central part, so that the pressure of the doctor blade at the width end of the gravure roll is weaker than the pressure of the doctor blade at other points.

6. A coating apparatus that presses a doctor blade onto a gravure roll to scrape off a portion of the coating liquid transferred from the gravure roll to the substrate, and which includes a blade holder that holds and secures the doctor blade, wherein a backing plate is provided between one or both sides of the doctor blade and the blade holder so that the doctor blade is pressed uniformly against the gravure roll, A coating apparatus characterized in that the backing plate is positioned such that the pressure of the doctor blade at the width end of the gravure roll is weaker than the pressure of the doctor blade at other points in the gravure roll.

7. The coating apparatus according to claim 6, characterized in that a notch is provided in the backing plate at a width position corresponding to the width end of the gravure roll, so that the pressure of the doctor blade at the width end of the gravure roll is weaker than the pressure of the doctor blade at other points.

8. The coating apparatus according to claim 6, characterized in that the backing plate on the outside of the width end of the gravure roll is shortened in the direction from the blade holder toward the gravure roll, so that the pressure of the doctor blade at the width end of the gravure roll is weaker than the pressure of the doctor blade elsewhere.

9. The coating apparatus according to claim 6, characterized in that the backing plate, which is narrower than the gravure roll, is positioned inside the entire width of the gravure roll, so that the pressure of the doctor blade at the width end of the gravure roll is weaker than the pressure of the doctor blade at other points on the gravure roll.

10. The coating apparatus according to claim 6, characterized in that the backing plate is positioned at a width position corresponding to the outside of the gravure roll from the width end of the gravure roll, with the backing plate being made of a material whose elastic modulus is lower than that of the central part, so that the pressure of the doctor blade at the width end of the gravure roll is weaker than the pressure of the doctor blade at other parts of the gravure roll.

11. The blade and An auxiliary member attached to the blade, Having the blade holder, A scraping unit that removes deposits from a roll member by bringing the blade into contact with it, The auxiliary member is configured to reduce the pressing force applied to a part of the blade. A scraping unit characterized by the following.

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