Web Suction Duct Layout for Smooth Sheet Transfer
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Solution Overview
Problem
The web formed in existing sheet manufacturing apparatuses is prone to adsorption on transport belts due to suction forces, making it difficult to separate from the transport belt when delivered to the sheet forming section.
Innovation Solution
The apparatus incorporates a suction section with a first duct, a second duct downstream of the first duct, and a third duct further downstream, featuring varying densities of suction holes, with fewer holes in the second region to facilitate easier separation of the web from the transport belt.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If suction force is increased to hold the web on the transport belt, then the web can be reliably transported, but the web becomes difficult to separate from the transport belt when delivered to the sheet forming section
Solution Approach 1:
The suction section is divided into multiple ducts (first duct, second duct, third duct) with varying suction hole densities along the transport direction. The first duct has high suction hole density for reliable web holding, while the third duct has low suction hole density for easy web separation, creating different suction characteristics in different regions to resolve the contradiction between reliable transport and easy separation
Solution Approach 2:
Different regions of the suction section are given different local qualities through varying suction hole densities. The first region (first duct) has high suction hole density for strong adhesion, while the second and third regions (second and third ducts) have progressively lower densities, creating a gradient suction force that facilitates smooth web release at the discharge point
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 smooth separation of the web from the transport belt, ensuring efficient transfer to the sheet forming section, thereby improving the manufacturing process.
Implementation Method 1
a suction section that is provided above the transport belt to cause the web to be adsorbed to the transport belt by suction
Data Source
AI summary
A sheet manufacturing apparatus 1 includes an accumulation section 50 that forms a web W; a transport belt 621 that comes into contact with one surface of the web W to hold the web W and transports the web W; a suction section 200 that is provided above the transport belt 621 to cause the web W to be adsorbed to the transport belt 621; and a sheet forming section 70 that forms the sheet with the web W, in which the suction section 200 has a first duct 210, a second duct 220 provided downstream of the first duct 210 in the transport direction, and a third duct 230 provided downstream of the second duct 220 in the transport direction, and a plurality of third suction holes 239a and 239b are provided in a suction region 233 of the third duct 230, the suction region 233 includes a first region 233a and a second region 233b located downstream of the first region 233a in the transport direction, and the number of the third suction holes 239b provided in the second region 233b is smaller than the number of the third suction holes 239a provided in the first region 233a.