Elastic Band Welding Pattern for Glue-Free Absorbent Product Assembly

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Solution Overview

Problem

Existing methods for manufacturing absorbent sanitary products face issues with glue usage, including uncontrollable glue dispensing, contamination risks, and quality decline due to intermittent welding vibrations, especially when producing alternating elastic and non-elastic portions.

Innovation Solution

Anchoring elastic threads to non-elastic webs using a welding pattern of anchoring and containing welds, eliminating the need for glue, and ensuring consistent bonding through ultrasonic welding with alternating weld types.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If glue is used to bond elastic elements to webs, then bonding is achieved, but glue dispensing control is poor and contamination risks increase

Engineering Contradiction:

Improvebonding reliabilityVSAvoidcontamination risk

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent replaces the chemical bonding system (glue) with a mechanical bonding system (welds). The welding device creates mechanical bonds between elastic elements and webs through ultrasonic vibration, eliminating the need for glue dispensing systems and thereby removing contamination risks associated with glue while maintaining reliable bonding.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent introduces an intermediary welding device that acts as a mediator between the elastic elements and the webs. This welding device creates bonding zones through ultrasonic vibration, serving as an intermediate mechanism that achieves reliable bonding without direct contact between glue and the bonding surfaces, thus eliminating contamination.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Manufacturing precision

If intermittent welding is used to create anchoring areas, then elastic elements are bonded at specific intervals, but vibrations cause quality decline

Engineering Contradiction:

Improveanchoring area positioningVSAvoidbonding quality

Core Design Contradiction:

Manufacturing precisionVSReliability

Solution Approach 1:

The patent employs periodic action through the welding device that creates alternating bonding zones and non-bonding zones along the elastic elements. The welding device is activated periodically to create anchoring areas at specific intervals, allowing the elastic elements to be bonded at discrete locations while maintaining overall product quality through controlled periodic welding action.

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The patent applies local quality by creating bonding zones with different characteristics at different locations. Anchoring areas have intensive bonding to secure elastic elements, while intermediate areas have reduced or no bonding to allow elastic movement. This localized variation in bonding quality optimizes both positioning precision and overall bonding reliability.

Inventive Principle:

Principle #3Local quality

3Ease of manufacture

If solenoid valves are used for intermittent glue dispensing, then anchoring areas are formed at intervals, but time delay and minimum spacing issues occur

Engineering Contradiction:

Improveanchoring area formationVSAvoiddispensing delay

Core Design Contradiction:

Ease of manufactureVSLoss of time

Solution Approach 1:

The patent replaces the solenoid valve-controlled glue dispensing system with a welding-based anchoring system. The welding device can be activated instantly without mechanical delay, eliminating the time lag associated with solenoid valve response and glue flow control. This enables precise timing and spacing of anchoring areas without the minimum spacing constraints of glue dispensing systems.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent maintains continuous production flow by using a welding device that can be activated continuously or intermittently without stopping the production line. The welding process occurs instantly when activated, eliminating the time delays and continuous glue flow requirements of solenoid valve systems, thereby maintaining continuous useful action throughout the manufacturing process.

Inventive Principle:

Principle #20Continuity of useful action

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

Provides consistent and high-quality bonding without glue, reducing contamination risks and improving product resistance in elastic and non-elastic areas.

Implementation Method 1

bonding means comprising a welding device configured to bond the elastic threads to the non-elastic webs

Methodology Applied

Scientific EffectUltrasonic welding: Ultrasonic Vibration

Data Source

PatentUS12575978B2Method for manufacturing absorbent sanitary products

Publication Date: 2026.03.17 FAMECCANICA DATA SPA

AI summary

A method for manufacturing absorbent sanitary products, comprising the steps of: forming a first and a second continuous elastic band, which are movable parallel to each other in a machine direction, fixing a plurality of absorbent panels between said first and second continuous elastic bands, arranged in a direction transverse to the machine direction, and spaced apart in said machine direction, wherein each of said elastic bands is formed by means of a method comprising the steps of: continuously feeding a plurality of tensioned elastic threads (30) in said machine direction, continuously feeding a pair of non-elastic webs arranged on opposite sides of said plurality of elastic threads, welding said pair of non-elastic webs to each other by means of a welding pattern comprising anchoring welds and/or containing and guiding welds.