Oscillating Arm Elastic Strip Joining for Absorbent Articles
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Solution Overview
Problem
Existing methods for attaching elastic strip members to absorbent articles, such as disposable diapers, face challenges in maintaining the strip members in a flat state and ensuring surface-contact attachment, especially when the strips intersect or are close to each other, leading to interference and attachment issues.
Innovation Solution
A manufacturing method and apparatus that utilize oscillating arms with spindle portion side rollers and oscillating end rollers to guide and reverse the elastic strip members, ensuring they are maintained in a flat shape and surface-contacted onto the sheet in a predetermined meander pattern, with distinct placing positions for each arm to avoid interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a rolling roller is used to transfer the elastic strip member, then the strip member can be maintained in a flat state and surface-contact the sheet, but the rolling rollers will collide against each other when reciprocating in the CD direction, preventing attachment in intersecting arrangement patterns
Solution Approach 1:
The patent divides the single rolling roller into multiple separate oscillating arms, each capable of independent oscillation. This segmentation allows each arm to independently place elastic strip members without collision, enabling versatile arrangement patterns including intersecting patterns while maintaining surface-contact attachment precision.
Solution Approach 2:
The patent employs oscillating arms that dynamically adjust their positions and oscillation phases. By controlling the oscillation of each arm independently, the system can adapt to different arrangement patterns (parallel, intersecting, overlapping) while maintaining the elastic strip members in a flat state during attachment.
2Ease of manufacture
If an oscillating arm with through hole is used to attach the elastic strip member, then the attachment process is simplified, but the strip member is folded when passing the through hole, preventing surface-contact attachment
Solution Approach 1:
The patent introduces a guide member as an intermediary component between the oscillating arm and the elastic strip member. The guide member ensures the strip member is properly guided and maintained in a flat state as it passes through the oscillating arm, preventing folding while maintaining the simplicity of the oscillating arm attachment mechanism.
3Quantity of substance
If multiple elastic strip members are attached in intersecting arrangement pattern, then the coverage and functionality are improved, but the rolling rollers collide when reciprocating, making such arrangement impossible
Solution Approach 1:
By dividing the attachment system into multiple independent oscillating arms, each arm can independently handle one elastic strip member without interfering with others. This enables the attachment of multiple strip members in intersecting, overlapping, or parallel patterns, improving coverage while maintaining operational simplicity.
Solution Approach 2:
The patent controls the oscillation parameters (amplitude, frequency, phase) of each oscillating arm independently. By adjusting these parameters, the system can achieve various arrangement patterns (intersecting, overlapping, parallel) with optimal coverage, while preventing collision between arms through coordinated parameter control.
Data Source
Figure 1A~1B
Figure 2A~2B
Figure 3
AI summary
A manufacturing method of a composite sheet of an absorbent article in which a continuous body of an elastic strip member is joined in a predetermined meander pattern in respect to a continuous body of a sheet that is continuously transported in a transporting direction, the method includes: a first joining of joining a first elastic strip member to a sheet by feeding and surface-contacting the continuous body of the first elastic strip member to the continuous body of the sheet, via a first oscillating arm that oscillates in a direction intersecting the transporting direction with a first spindle portion as a swivel center; a second joining of joining a second elastic strip member to the sheet by feeding and surface-contacting the continuous body of the second elastic strip member to the continuous body of the sheet, via a second oscillating arm that oscillates in a direction intersecting the transporting direction with a second spindle portion as a swivel center, wherein in the first joining, the first elastic strip member supplied toward the first spindle portion side roller of a first oscillating arm is subsequently put around an outer circumferential face of the first spindle portion side roller and an outer circumferential face of the first oscillating end side roller of the first oscillating arm, and, after being reversed in a travel direction with the first oscillating end side roller, is placed on the continuous body of the sheet and joined thereon, wherein in the second joining, the second elastic strip member supplied toward the second spindle portion side roller of a second oscillating arm is subsequently put around an outer circumferential face of the second spindle portion side roller and an outer circumferential face of the second oscillating end side roller of the second oscillating arm, and, after being reversed in the travel direction with the second oscillating end side roller, is placed on the continuous body of the sheet and joined thereon, wherein a first placing position where the continuous body of the first elastic strip member is to be placed on the continuous body of the sheet with the first oscillating arm and a second placing position where the continuous body of the second elastic strip member is to be placed on the continuous body of the sheet with the second oscillating arm are different from each other in the transporting direction.