Formed Fibrous Absorbent Core Pin Calendering Without Carrier Layers
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Solution Overview
Problem
Pin calendering processes for forming fibrous articles require a carrier layer, increasing manufacturing complexity and product cost, and potentially affecting fluid handling characteristics.
Innovation Solution
A method and apparatus for pin-calendering formed fibrous articles without the use of a carrier layer, utilizing a pin calendering station with a vacuum roll and calender roll to compress and densify the fibrous article, maintaining a uniform basis weight while achieving a three-dimensional profile.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pin calendering is performed using a carrier layer, then the fibrous article can be supported during compression, but the manufacturing complexity and product cost increase
Solution Approach 1:
The patent removes the carrier layer from the pin calendering process, allowing the fibrous article to be compressed directly between the calender rolls. This extraction of the carrier layer eliminates the additional material and handling steps, reducing manufacturing complexity while maintaining compression effectiveness through direct contact between the article and rolls.
Solution Approach 2:
The fibrous article itself serves as its own support structure during the pin calendering process, without requiring an external carrier layer. The article's inherent structural integrity allows it to withstand the compression forces directly, making the process self-sufficient and eliminating dependency on additional supporting materials.
2Reliability
If a carrier layer is used during pin calendering, then the fibrous article is supported, but the fluid handling characteristics may be adversely affected
Solution Approach 1:
By removing the carrier layer from the process, the patent eliminates the potential negative impact on fluid handling characteristics. The fibrous article's native structure, without an additional carrier layer, maintains its optimal fluid absorption and distribution properties, as the carrier layer could potentially block or alter fluid flow paths.
3Reliability
If a carrier layer is incorporated into the final product, then support is provided, but the product cost increases
Solution Approach 1:
The patent extracts the carrier layer from the final product composition, using it only temporarily during formation if needed, but eliminating it from the finished article. This reduces material costs and simplifies the bill of materials, as the fibrous article stands alone without requiring an additional supporting layer in the final configuration.
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 eliminates the need for a carrier layer, simplifying the manufacturing process, reducing costs, and enhancing fluid handling properties of the fibrous articles used as absorbent core structures in disposable sanitary products.
Implementation Method 1
The air-entrained defiberized material may be formed into a formed fibrous article through the use of a porous mold structure subjected to a vacuum to draw the defiberized material into the mold
Implementation Method 2
pin-calendering the fibrous article in a pin calendering station between a first roll and a second roll, wherein the fibrous article is conveyed through a nip defined between the first roll and the second roll
Data Source
AI summary
The present invention generally relates to a method and apparatus for a making a formed fibrous article and more specifically to method and apparatus for making a formed fibrous article useful as an absorbent core structure in a disposable sanitary article such as a sanitary napkin, panty liner, diaper or the like. The present invention also relates to a disposable sanitary article including a formed fibrous article according to the present invention as a core structure thereof.