Absorbent Pad Forming Drum with Masking Layer for Channel Integrity
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Solution Overview
Problem
Existing apparatus for forming absorbent pads in sanitary articles face issues with adhesive spreading on channel zones, leading to absorbent material adherence and potential damage during the pressing process, requiring precise calibration to avoid defects.
Innovation Solution
An apparatus with a forming drum and suction system to inhibit absorbent material retention at channel zones, combined with ultrasonic welding for secure joins and a removal system to ensure cleanliness before welding, allowing for precise and reliable channel formation without absorbent material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If adhesive is spread on the sheets at the channel zones to join the layers, then the bonding strength is improved, but the absorbent material adheres to the sheets at the channels causing damage during pressing
Solution Approach 1:
The patent extracts the adhesive application from the channel zones by using a masking layer that covers the channels during adhesive spreading. This prevents adhesive from contacting the absorbent material at the channels, eliminating the adherence problem while maintaining bonding strength at non-channel areas where the masking layer is absent
Solution Approach 2:
The masking layer acts as an intermediary between the adhesive and the absorbent material at the channels. It temporarily prevents direct contact during the adhesive application process, allowing the adhesive to bond the sheets at non-channel zones without causing material adherence or damage
2Strength
If pressure device is used to optimize adhesion at the channels, then the bonding is improved, but the absorbent material can be damaged or perforated if deposited between the pressure device and mating part
Solution Approach 1:
The patent extracts the pressing action from the channel zones by using the masking layer to prevent absorbent material deposition in these areas. Without material between the pressure device and mating part, the pressing operation can proceed without risk of damage or perforation, while still achieving adequate adhesion at the non-channel zones
Solution Approach 2:
The masking layer is applied before the adhesive and absorbent material are introduced, preliminarily preventing material deposition at the channels. This preliminary protection ensures that when pressing occurs, no material is present in the channel zones to be damaged or perforated
3Reliability
If pressure is precisely calibrated to avoid material damage, then material integrity is maintained, but the complexity and time for calibration increases
Solution Approach 1:
By removing the absorbent material from the channel zones through the masking layer approach, the patent eliminates the need for precise pressure calibration in these areas. The pressing operation can use standard, less complex calibration settings since there is no material present to be damaged, simplifying the overall calibration process while maintaining material integrity
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 solution enables the production of absorbent pads with secure and reliable channels, preventing material adherence and damage, while ensuring precise and effective channel formation, resulting in higher quality and reliability of the pads.
Implementation Method 1
The forming drum comprises a suction system to create, for example on the first web advancing on the forming drum, a spread of absorbent material according to the absorbent material spreading pattern
Implementation Method 2
The welding system comprises a first welding element and a second welding element acting in conjunction with each other
Data Source
AI summary
A method for forming an absorbent pad including a first layer, a second layer and an absorbent material interposed between the first and the second layer and arranged according to a spreading pattern M1 having at least one channel which is free of absorbent material, includes a step of feeding a first web, intended to form the first layer of the pad; a step of feeding a second web, intended to form the second layer of the pad; a step of spreading the absorbent material on the first web according to the spreading pattern M1; a step of spreading an adhesive on the first web according to a gluing pattern; a step of welding the first web and the second web according to a welding pattern M3 including at least one welding zone at the channel on the pad.