Integrated Transfer Unit for Elastic Tape Cutting and Application
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Solution Overview
Problem
Existing machines for producing absorbent sanitary articles face issues with positioning errors and malfunctions due to separate cutting and transfer units for elastically stretched tape segments, and the inability to apply glue before cutting, which complicates the process and reduces precision.
Innovation Solution
An integrated apparatus that combines cutting, stretching, and application operations on the same transfer element, allowing for precise application of elastically stretched tape segments directly to a composite web while applying glue before cutting, eliminating the need for separate units and reducing transfer errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate cutting and transfer units are used for elastic segments, then the stretching function is achieved, but positioning errors and malfunctions occur due to transfer between units
Solution Approach 1:
The patent merges the cutting unit and transfer unit into a single integrated unit. The transfer element performs both cutting and stretching functions sequentially, eliminating the need to transfer segments between separate units and thereby preventing positioning errors and malfunctions.
Solution Approach 2:
The transfer element is designed with multi-functionality, serving as both a cutting tool (with cutting edge) and a stretching mechanism (through movement between first and second positions). This universal element replaces multiple specialized components.
2Ease of manufacture
If glue is applied after cutting, then the cutting process is simplified, but the glue application becomes more difficult and less precise
Solution Approach 1:
The patent applies glue to the elastic segment at the first position before the cutting action occurs. This preliminary gluing ensures that the adhesive is properly positioned on the segment, and the segment is already prepared for bonding when it is transferred to the second position, improving both ease of manufacture and precision.
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
The integrated apparatus ensures precise application of elastically stretched tape segments with reduced malfunctions, enhancing the production efficiency and accuracy of absorbent sanitary articles by integrating cutting, stretching, and gluing operations in a single unit.
Implementation Method 1
elastically stretching tape segments in the transverse direction
Data Source
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AI summary
An apparatus for cutting and applying elastically stretched tape segments, comprising: - a transfer unit (22) comprising a plurality of transfer elements (24), each of which comprises two gripping elements (28) movable between a close position and a distant position, - a plurality of anvil elements (30) carried by the transfer unit (22) and moving together with the transfer elements (24), and - a rotary knife (32) cooperating with the anvil elements (30) to transversely cut successive end portions of a continuous elastic tape (14) held by the transfer elements (24).