Stack of folded web material for hygiene products
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Solution Overview
Problem
In dispensers for hygiene products, stacks of interfolded webs with offset weakening lines face challenges in maintaining synchronization during dispensing, especially when fed from the top, leading to asynchronous feeding and difficulties in threading, particularly with large or interconnected stacks.
Innovation Solution
A stack of folded web material with two interfolded webs, where the lines of weakness are offset and joined by individual sheet interconnections with a separation strength less than the weakening lines, distributed along the stack to maintain web synchronization and prevent simultaneous dispensing of multiple sheets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If two separate webs are used in an interfolded stack with offset weakening lines, then automatic feeding in manual dispensers is achieved, but threading becomes extra difficult and web breakage risks increase
Solution Approach 1:
The patent merges the two separate webs into a single compound web structure where they are bonded together along their entire length. This combination maintains the automatic feeding function through offset weakening lines while eliminating threading difficulties by presenting a single unified web to the dispenser mechanism.
Solution Approach 2:
The two webs are preliminarily bonded together along their entire length before being fed into the dispenser. This preliminary bonding action ensures that the webs remain synchronized and together throughout the threading process, preventing the need to thread them separately and reducing the risk of misalignment or breakage.
2Extent of automation
If two separate webs are used in an interfolded stack, then automatic feeding is achieved, but the risk of unintentional web breakage increases and re-threading becomes necessary
Solution Approach 1:
By bonding the two webs together into a single compound web structure, the patent reduces the risk of unintentional breakage. The bonded structure ensures that both webs move together as one unit, preventing separation and misalignment that could lead to breakage during dispensing operations.
3Quantity of substance
If the storage space and web path are arranged to feed from the top of the stack, then large amounts of web material can be stored, but asynchronisation between webs increases during continued dispensing
Solution Approach 1:
The patent merges the two webs into a single bonded compound web that maintains synchronisation throughout the dispensing process. The bonding along the entire length ensures that both webs move together as one unit, preventing asynchronisation even when feeding from the top of a large stack in vertical dispensers.
Solution Approach 2:
The webs are preliminarily bonded together before being loaded into the dispenser. This preliminary bonding action ensures that the webs remain synchronized during the entire dispensing process, including when large quantities are stored and dispensed from the top of the stack, as the bonded structure prevents separation and misalignment.
4Extent of automation
If two separate webs are used with offset weakening lines, then automatic feeding is achieved, but maintaining the offset relationship during threading becomes difficult
Solution Approach 1:
The patent merges the two webs into a single bonded compound web structure. The bonding along the entire length of the webs ensures that the offset relationship between weakening lines is maintained consistently throughout the stack, as the bonded structure prevents relative movement and misalignment during threading and dispensing.
Data Source
AI summary
A stack of folded web material for hygiene products, such as paper or nonwoven products, said stack including: at least two webs, the webs including: a first web divided into individual sheets by means of lines of weakness; and a second web divided into individual sheets by means of lines of weakness; said first and second webs being interfolded with one another so as to form said stack; and wherein the first web and the second web are arranged in said stack such that the lines of weakness of the first web and the lines of weakness of the second web are offset with respect to one another along the webs; each line of weakness having a separation strength, being the force required to separate an individual sheet from the web along said line of weakness.