Stretch Film Side Panel for Absorbent Articles

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Solution Overview

Problem

Current methods for applying stretchable poly web in diaper manufacturing result in material waste and distortion due to the elasticity of the poly web, leading to unacceptable patch lengths and increased costs, as the poly web is applied continuously along the entire product length rather than only where necessary.

Innovation Solution

An apparatus and method involving a base non-woven layer with character strips, intermittently bonded stretch film, and a cover non-woven layer, using heated knives and vacuum commutation to cut the stretchable film while stretched, reducing material layers and preventing snap-back distortion.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If poly web is applied continuously along the entire product length, then the poly web provides continuous coverage, but material waste increases and costs increase

Engineering Contradiction:

Improvecontinuous coverageVSAvoidmaterial waste

Core Design Contradiction:

ReliabilityVSLoss of substance

Solution Approach 1:

The poly web application is divided into discrete segments corresponding to individual insert cores rather than continuous application. The chassis web is processed continuously, but poly web is applied only at specific locations where insert cores are positioned, creating segmented coverage that eliminates waste from continuous application.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Poly web coverage is localized to specific regions where insert cores are present rather than applying uniformly across the entire chassis web. This local quality approach ensures poly web is applied only where functional coverage is needed, reducing material waste while maintaining reliability at critical locations.

Inventive Principle:

Principle #3Local quality

2Loss of substance

If poly web is stretched and cut, then discrete patches can be applied only where needed, but the elasticity of poly web causes distortion and snap-back leading to unacceptable patch lengths

Engineering Contradiction:

Improvematerial waste reductionVSAvoidpatch length uniformity

Core Design Contradiction:

Loss of substanceVSManufacturing precision

Solution Approach 1:

The poly web is pre-stretched to the desired final dimensions before cutting into discrete patches. By performing the stretching action beforehand, the material is held in its expanded state during cutting, ensuring precise patch lengths without snap-back distortion. This preliminary action eliminates the precision problems that would occur if cutting were attempted without pre-stretching.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The stretching process is designed to accommodate the elastic recovery characteristics of the poly web material. By controlling the stretch ratio and holding conditions before cutting, the system compensates for potential snap-back effects, ensuring that the final patch dimensions meet specifications despite the material's elasticity.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

3Strength

If multiple layers of material are used in the side seam bond sandwich, then structural integrity is maintained, but ultrasonic bonding becomes difficult and product uniformity decreases

Engineering Contradiction:

Improvestructural integrityVSAvoidultrasonic bonding difficulty

Core Design Contradiction:

StrengthVSEase of manufacture

Solution Approach 1:

The side seam bonding structure is segmented into discrete bonding zones rather than requiring continuous bonding through multiple layers. By positioning insert cores at specific intervals and applying poly web only at these locations, the number of layers requiring simultaneous bonding is reduced, making ultrasonic bonding more effective and easier to manufacture.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Excess material layers are removed from the side seam region by not applying poly web continuously along the entire chassis web length. This extraction of unnecessary layers simplifies the bonding sandwich structure, improving ultrasonic bonding effectiveness while maintaining structural integrity where poly web coverage is actually needed.

Inventive Principle:

Principle #2Taking out (Extraction)

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 reduces material waste, facilitates ultrasonic bonding, and produces a more uniform product with fewer layers, allowing for efficient application of poly web only where needed, thereby minimizing costs and improving product quality.

Implementation Method 1

Heated knives sever the stretched film

Methodology Applied

Scientific EffectHeating: Heating

Implementation Method 2

vacuum communication held the stretched film to the rotating body

Methodology Applied

Scientific EffectVacuum: Vacuum

Data Source

PatentEP2345395B1Apparatus and method for producing absorbent article with stretch film side panel and application of intermittent discrete components of an absorbent article

Publication Date: 2014.09.24 JOA CURT G INC

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AI summary

Apparatus and methods are provided to allow for creation of a configured laminate of a non-woven material, to which a character strip is applied, the character strip exposed by either heat severing and removal of overlying materials, or intermittent application of overlying materials to leave the desired portions of the character strip exposed. A simultaneously formed core insert is applied to a preformed chassis web.