Disposable Diaper Cutting Mechanism for Accurate Side Piece Positioning
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Solution Overview
Problem
Existing disposable diaper production methods fail to accurately manage the cutting positions of side pieces due to their free movement during cutting, leading to inconsistent cuts.
Innovation Solution
A method and device that fold the main body portion to form overlapping side pieces, use driving and facing blades to cut the side pieces uniformly, and convey them in a way that holds the side pieces in place during cutting, with the cutting blades rotating faster than the conveyance rate to ensure accurate cutting positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the webs are placed only on the guide plate during cutting, then the device structure is simple, but the cutting positions cannot be accurately managed due to free movement of the webs
Solution Approach 1:
The guide plate is divided into a fixed portion and a movable portion that can be independently controlled. The movable portion includes multiple guide sections that can be adjusted to different positions, allowing the web to be precisely positioned during cutting while keeping the overall device structure relatively simple.
Solution Approach 2:
A movable guide portion is introduced as an intermediary element between the fixed guide plate and the web. This movable portion can be adjusted to precisely control the web position during cutting, improving cutting accuracy without requiring complete redesign of the entire guide system.
2Manufacturing precision
If the driving blades rotate faster than the conveying rate, then the cutting positions are accurately managed, but the speed differential requires precise control
Solution Approach 1:
The control system monitors the positions of the driving blades and conveying mechanism, and automatically adjusts their speeds to maintain the optimal speed differential. This feedback control ensures accurate cutting positions while managing the complexity of coordinating multiple moving parts.
Solution Approach 2:
The system dynamically adjusts the rotational speed of the driving blades relative to the conveying rate. By changing these operational parameters in real-time based on the cutting requirements, the system achieves precise cutting positions while adapting to different production conditions.
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 approach allows for precise and consistent cutting of side pieces, ensuring accurate management of cutting positions and reliable cutting, preventing movement during the cutting process.
Implementation Method 1
rotating and driving a driving shaft to rotate a pair of driving blades about an axial line of the driving shaft and compressing each set of the two side pieces joined to each other between the respective driving blades and a pair of facing blades facing the respective driving blades to cut off end portions of the two side pieces uniformly
Implementation Method 2
conveying the constituents in the longitudinal direction in a state in which both side portions in the width direction of a cutting position of the respective side pieces are held for each set of the two side pieces
Data Source
AI summary
Provided are a disposable diaper production method and a disposable diaper production device by which cutting positions of respective side pieces can be accurately managed. A partly-finished product is conveyed in a longitudinal direction in a state in which both side portions in the width direction of the cutting position of respective side panel pieces are held for each set of the two side panel pieces when the respective side panel pieces are cut off by a cutting unit. A controller controls driving rates of a cutting motor and a conveying motor to rotate driving blades at a rate faster than the conveying rate of the partly-finished product.