Sheet manufacturing apparatus
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Solution Overview
Problem
In sheet manufacturing apparatuses, the air flow from humidification sections can lead to unstable moisture distribution across the web, resulting in non-uniform moisture content and varying strength across the sheet surface, affecting its quality.
Innovation Solution
A sheet manufacturing apparatus with a web transport section using a transport belt that contacts one surface of the web and a humidification section applying moisture from the opposite surface, along with a suction section positioned between the transport belt and humidification section, featuring multiple suction ports and a discharge port, where the first suction port and discharge port are aligned to stabilize air flow and ensure uniform moisture application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the web is transported downstream while being humidified by the humidification section, then the web can be moistened, but the air flow becomes unstable and moisture distribution becomes non-uniform
Solution Approach 1:
A suction section is introduced as an intermediary component between the humidification section and the web transport section. This suction section includes a suction port that faces the discharge port of the humidification section, creating a controlled air flow path that stabilizes the humidified air delivery to the web surface, thereby ensuring uniform moisture distribution
Solution Approach 2:
The invention utilizes pneumatic principles by employing a suction section with suction ports to create negative pressure that guides and stabilizes the air flow from the humidification section. This pneumatic control mechanism ensures consistent delivery of humidified air to the web, resolving the instability issue
2Quantity of substance
If humidified air is discharged to moisten the web, then the web gains moisture, but the air flow instability causes varying strength across the sheet surface
Solution Approach 1:
The suction section acts as a mediator that stabilizes the air flow path between the humidification section and the web. By controlling the air flow through the suction port positioned opposite to the discharge port, the system ensures uniform moisture penetration throughout the web, which in turn ensures uniform strength across the sheet surface
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 stabilizes the air flow and ensures uniform moisture distribution across the web, enhancing the mechanical strength and quality of the sheet by maintaining consistent moisture levels in the in-plane direction.
Implementation Method 1
a suction section provided to face the humidification section with the transport belt interposed therebetween, in which the suction section has a plurality of suction ports for suctioning air
Implementation Method 2
a humidification section provided to face the one surface of the transport belt and applying moisture from the other surface side of the web
Data Source
AI summary
There is provided a sheet manufacturing apparatus that manufactures a sheet from a material containing fibers, including: an accumulation section that forms a web by accumulating the material containing fibers by an air flow; a web transport section including a transport belt that comes into contact with one surface of the web and holds the web; a humidification section provided to face the one surface of the transport belt and applying moisture from the other surface side of the web; and a suction section provided to face the humidification section with the transport belt interposed therebetween, in which the suction section has a plurality of suction ports for suctioning air, the humidification section has a discharge port for discharging humidified air, and among the plurality of suction ports, a first suction port and the discharge port are disposed to face each other.