Disposable Wearable Article Production Pressing Unit
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Solution Overview
Problem
The existing device for producing disposable wearable articles experiences sealing failures due to the elastic force of absorbers causing the doubled sheet to open, leading to adhesion failures in the joining/cutting process.
Innovation Solution
A device and method that include a pressing unit upstream of the joining/cutting unit to press the doubled sheet with the absorber in the thickness direction, preventing the sheet from opening against the absorber's elastic force, and a doubling unit with a friction reducing mechanism to facilitate smooth sheet conveyance and doubling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If the sheet is doubled together with the absorber using the doubling unit, then the opposite side edges of the sheet are proximate to or overlapped with each other, but the elastic force of the absorber causes the doubled sheet to open leading to sealing failure
Solution Approach 1:
The pressing unit applies pressing force to the doubled sheet in advance before the joining/cutting process, counteracting the elastic force of the absorber that would otherwise cause the sheet to open. This preliminary anti-action ensures the sheet remains properly adhered during subsequent joining operations, preventing sealing failures.
Solution Approach 2:
The pressing unit performs the pressing action on the doubled sheet before the joining/cutting unit processes it. By establishing proper adhesion and configuration in advance, the sheet is prepared in an optimal state for the subsequent joining operation, ensuring reliable sealing.
2Ease of manufacture
If the absorbing unit presses the crotch part against the bottom edge of the doubling member, then the sheet is doubled, but the sheet on one side and the sheet on the other side are not held in adhesion state in the joined parts
Solution Approach 1:
The pressing unit applies counteracting force to the elastic absorption force, maintaining the sheet in a pressed, adhered state during the joining process. This prevents the sheet edges from separating in the joined parts, ensuring manufacturing precision.
3Productivity
If the sheet is conveyed at high speed to subsequent processes, then productivity is enhanced, but the sheet may distort during conveyance
Solution Approach 1:
The pressing unit establishes proper sheet configuration and adhesion before high-speed conveyance begins. By preparing the sheet in an optimal, stable state in advance, the sheet maintains its shape during rapid movement through subsequent processes, enabling both high productivity and shape stability.
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 solution effectively suppresses sealing failures by maintaining the adhesion of sheet parts at the absorber's sides during joining/cutting and allows for high-speed conveyance of the sheet to subsequent processes without distorting the sheet shape, enhancing productivity.
Implementation Method 1
the elastic force of the absorber, the sheet on one side, which will become a front belly part, and the sheet on the other side, which will become a back part, are not held in a state of adhesion
Implementation Method 2
a doubling unit with a friction reducing mechanism to facilitate smooth sheet conveyance and doubling
Data Source
AI summary
Provided are a device for producing a disposable wearable article and a method for producing a disposable wearable article capable of suppressing the occurrence of a sealing failure by making it difficult for a doubled sheet to open against an elastic force of an absorber. A device for producing a disposable wearable article includes a jointing/cutting unit (60) provided in a line (L1) for continuously conveying a sheet (W) and configured to join parts of the doubled sheet (W) at opposite sides of an absorber (C) and then cut the joined parts and a pressing unit (70) arranged upstream of the jointing/cutting unit (60) in a conveying direction (a). The pressing unit (70) includes a pressing mechanism (71, 72) configured to press the sheet (W) together with the absorber (C) in a thickness direction.