Single-Transfer Pad Placement With Pitch and Angle Adjustment
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Solution Overview
Problem
Existing methods for manufacturing disposable absorbent articles, such as diapers and sanitary pads, require a separate step for cutting and transferring absorbent pads, leading to excessive wear on devices due to momentum changes and mismatched cut and placement pitches.
Innovation Solution
A system that receives a continuous web, cuts sections to form pads, spins them to a predetermined angle, and adjusts spacing for proper placement on a receiving surface, using a transfer mechanism with cam followers and vacuum manifolds to manage puck movement and spacing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a separate transfer step is used between cutting and placing pads, then the cutting and transfer processes can be performed independently, but the device complexity increases and manufacturing efficiency decreases
Solution Approach 1:
The patent combines the cutting mechanism and transfer mechanism into a single integrated system. The cutter assembly is positioned to cut pads from the web while the pads remain on the transfer mechanism, eliminating the need for separate transfer steps between cutting and placement operations.
Solution Approach 2:
The transfer mechanism serves multiple functions simultaneously: it transports the continuous web, supports the cutting operation, and positions the cut pads for placement on the receiving surface. This multi-functionality reduces the need for dedicated separate mechanisms for each operation.
2Productivity
If the web is cut at a different pitch than the receiving pitch, then the cut pitch can be optimized for cutting efficiency, but additional re-pitching mechanisms are required causing excessive device wear
Solution Approach 1:
The transfer mechanism incorporates variable speed control and adjustable spacing between transfer elements (such as rollers or belts). This allows the system to dynamically adjust the pitch of pads during transfer, converting pads cut at one pitch to the required receiving pitch without excessive mechanical stress or wear.
Solution Approach 2:
The system changes the spacing parameter of transfer elements to achieve pitch conversion. By adjusting the distance between transfer points or the speed of transfer elements at different positions, the pad pitch is modified from the cut pitch to the receiving pitch.
3Manufacturing precision
If pads are spun to a predetermined angle during transfer, then the orientation is optimized for placement, but the transfer mechanism complexity increases
Solution Approach 1:
The transfer mechanism uses a rotating drum or cylindrical surface that naturally imparts rotational motion to pads during transfer. The curved surface of the drum allows pads to be spun to the desired angle through the geometry of the rotation, eliminating the need for separate spinning mechanisms.
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 eliminates the need for a separate transfer step, reduces device wear, and ensures accurate spacing and orientation of pads during the manufacturing process.
Implementation Method 1
Each puck has a leading edge and a trailing edge and is coupled to a puck support... A velocity profile is provided to the pucks... wherein the velocity profile holds the web on the pucks with the vacuum
Data Source
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AI summary
An apparatus and method is provided for single transfer insert placement. The apparatus receives continuous web material and cuts a discrete section or pad from the web. The pad is then supported on a single transfer surface. The single transfer surface then may spin the supported pad to a desired angle and provide the pad to a receiving surface at a desired interval.