Dry end surface treatment using ultrasonic transducers

• US 20040058075A1
• Filed: 09/11/2003
• Published: 03/25/2004
• Est. Priority Date: 12/11/2001
• Status: Active Grant

• Current Assignee: Ultra Technology Europe AB
• Original Assignee: Ultra Technology Europe AB
• Inventors: Dahlberg, Hakan
• Granted Patent: US 6,942,904 B2
• Time in Patent Office: Days
• US Class Current: 427/355
• CPC Class Codes: B01J 19/008 Processes for carrying out reactions under cavitation conditions
• CPC Class Codes: B01J 19/10 employing sonic or ultrasonic vibrations
• CPC Class Codes: B01J 2219/0877 Liquid
• CPC Class Codes: B01J 2219/089 Liquid-solid
• CPC Class Codes: B05C 1/14 using a travelling band
• CPC Class Codes: B05C 11/04 with blades
• CPC Class Codes: B05C 3/18 only one side of the work coming into contact with the liquid or other fluent material B05C3/02 takes precedence
• CPC Class Codes: C02F 1/36 ultrasonic vibrations
• CPC Class Codes: C02F 1/52 by flocculation or precipitation of suspended impurities C02F1/463 takes precedence
• CPC Class Codes: C02F 11/04 Anaerobic treatment; Production of methane by such processes
• CPC Class Codes: C02F 2103/28 from the paper or cellulose industry
• CPC Class Codes: D21H 25/10 with blades

Abstract

The method is for applying a coating on a paper substance. A paper moves over a set of rollers. A coating is applied with a coating applicator that has ultrasonic transducers to vibrate the coating to reduce the viscosity of the coating. A downstream blade has an ultrasonic transducer in operative engagement with the blade. The vibrating blade is applied to the paper for scraping off excessive coating from the paper.

Claims

1. A method of applying a coating on a paper substance comprising:

moving a paper over a roller;

applying a coating color to the paper with a coating color applicator;

vibrating a blade with an ultrasonic transducer in operative engagement with the blade; and

applying the vibrating blade to the paper to scrape off excessive coating color from the paper.

2. The method according to claim 1 wherein the method further comprises bending the blade with a pressure applicator that bears against the blade while the paper moves passed the blade.

3. The method according to claim 1 wherein the method further comprises providing the coating color applicator with an ultrasonic transducer and subjecting the coating color with an ultrasonic energy from the ultrasonic transducer to lower a the viscosity of the coating color.

4. The method according to claim 1 wherein the method further comprises transferring ultrasonic vibration from the ultrasonic transducer to a blade tip of the blade.

5. The method according to claim 1 wherein the method further comprises holding the blade with a holder and providing the holder with grooves to prevent transmission of ultrasonic energy along a width of the holder.

6. The method according to claim 1 wherein the method further comprises adhering the ultrasonic transducer directly on the blade.

7. The method according to claim 5 wherein the method further comprises firmly holding the blade in the holder to prevent loss of ultrasonic energy transferred from the ultrasonic transducer through the holder to the blade and circulating water through pins.

8. The method according to claim 1 wherein the method further comprises applying the coating color through an endless wire.

9. The method according to claim 8 wherein the method further comprises applying the coating color while subjecting the coating color to ultrasonic energy.

10. The method according to claim 2 wherein the method further comprises providing the pressure applicator with an ultrasonic transducer that vibrates the pressure applicator.