Spraying Apparatus for Paper Machine Canvas Anti-Soiling
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Solution Overview
Problem
Existing methods for preventing the adhesion of paper powder and pitch to canvas in paper machines are inefficient, as the canvas travels at the same speed as the wet paper, making it difficult to apply anti-soiling agents effectively.
Innovation Solution
A method involving guiding the canvas to an inside and outside roll, positioning a spraying apparatus between these rolls, and spraying a chemical solution toward the outside roll along the canvas's travel direction, with a soil removal apparatus upstream to enhance the application and effectiveness of the solution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the canvas travels at the same speed as the wet paper, then the canvas can effectively press and dry the wet paper, but the anti-soiling agent cannot be efficiently applied to the canvas
Solution Approach 1:
The patent introduces a speed difference between the canvas and wet paper by using a speed adjustment mechanism. The canvas is driven at a different speed than the wet paper through a speed adjustment roller, creating relative motion that enables efficient anti-soiling agent application while maintaining the canvas's drying function.
Solution Approach 2:
The patent uses a speed adjustment roller as an intermediary element between the wet paper and canvas drive system. This intermediary allows independent speed control of the canvas, enabling it to travel at a different speed than the wet paper for improved agent application efficiency.
2Reliability
If a spraying apparatus is used to apply anti-soiling agent, then the agent can be applied to the canvas, but the application is not efficient due to canvas travel speed
Solution Approach 1:
The patent creates dynamic conditions for agent application by introducing a speed difference between canvas and wet paper. This relative motion allows the spraying apparatus to efficiently apply the anti-soiling agent to the canvas surface as it passes through the treatment zone.
Solution Approach 2:
The patent changes the speed parameter of the canvas relative to the wet paper. By adjusting the canvas speed through the speed adjustment roller, the system optimizes the relative velocity between canvas and spray apparatus for efficient agent application.
3Productivity
If the canvas speed is increased to improve agent application, then spraying efficiency improves, but the drying function is compromised
Solution Approach 1:
The patent segments the speed control into two independent systems: one for wet paper and one for canvas. This allows the canvas speed to be independently adjusted for optimal agent application without affecting the wet paper processing speed or drying performance.
Solution Approach 2:
The speed adjustment roller serves as an intermediary that decouples the canvas drive from the wet paper drive. This allows independent speed control of the canvas to optimize agent application while maintaining the original drying process parameters.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration allows for efficient application of the chemical solution to the canvas, significantly reducing the adhesion of paper powder and pitch, ensuring a uniform film and preventing soiling, while minimizing nozzle clogging and uneven spraying.
Implementation Method 1
spraying a chemical solution continuously on a canvas used in a dry part of a paper machine by a spraying apparatus while making the canvas travel
Implementation Method 2
the chemical solution is sprayed toward the outside roll along the travel direction of the canvas
Data Source
AI summary
[TASK] Provided is a method of spraying a chemical solution, the method being capable of efficiently applying a chemical solution to a traveling canvas and sufficiently preventing the adhesion of paper powder and pitch to the canvas.[MEANS OF SOLVING THE PROBLEM] The present invention provides a method of spraying a chemical solution Y, the method comprising spraying the chemical solution Y continuously on a canvas K used in a dry part D of a paper machine by a spraying apparatus 10 while making the canvas K travel, wherein the canvas K is guided to an inside roll IR and an outside roll OR, and wherein the spraying apparatus 10 is disposed upstream from the outside roll OR and between the inside roll IR and the outside roll OR, and the chemical solution Y is sprayed toward the outside roll OR along a travel direction Y2 of the canvas K.