Centre-Fed Roll Dispenser Opening for Tear Control and Roll Retention
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Solution Overview
Problem
Existing dispensers for centre-fed rolls of tissue or nonwoven materials face issues with breaking the paper web during withdrawal and risk of the roll falling out when the remaining material is small, especially when the web material is thin.
Innovation Solution
The dispenser features an elongated opening with one side having tearing means and the opposite side smooth, ensuring the paper can be withdrawn without breaking and preventing the roll from falling out, along with a flexible casing for easy refilling and storage, and a reclosable opening for multiple use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the dispenser opening is made large to facilitate easy withdrawal of paper web, then the ease of operation is improved, but the roll may fall out when remaining material is small
Solution Approach 1:
The dispenser opening has different characteristics on different sides: one side has a smooth edge while the opposite side has tearing means. This local differentiation allows the opening to simultaneously facilitate easy withdrawal on the smooth side while preventing roll ejection through the asymmetric geometry created by the tearing means on the opposite side
2Ease of operation
If tearing means are provided on both sides of the dispenser opening, then the tearing function is improved, but the paper web may break during withdrawal
Solution Approach 1:
Tearing means are localized to only one side of the dispenser opening while the opposite side maintains a smooth edge. This local quality differentiation ensures that tearing functionality is provided where needed while the smooth side prevents damage to the paper web during the withdrawal process
3Reliability
If the dispenser opening width is reduced to prevent roll ejection, then the roll retention is improved, but the ease of withdrawal deteriorates
Solution Approach 1:
The dispenser opening is designed with asymmetric characteristics where one side has a smooth edge and the opposite side has tearing means. This asymmetric geometry allows the opening to have dimensions that retain the roll effectively while still permitting easy withdrawal of the paper web through the smooth side
Data Source
AI summary
A dispenser for a centre-fed roll (11 ) of web material (12) in the form of tissue paper or nonwoven material. The dispenser has a dispenser opening (16) which in one aspect of the invention has an elongated shape wherein one side edge (18) is provided with tearing means (17) and the opposite side edge (19) is smooth and free from tearing means, and wherein the length (L) of the dispenser opening (16) is between 40 and 90% of the roll diameter and the width (W) of the dispenser opening is at least 10 times the thickness of the web material and at least 5 mm, but no more than 40 mm. In a further aspect of the invention the dispenser is portable, wherein at least a substantial part of the dispenser is made of a moisture and tear resistant flexible material adapted for multiple use and the dispenser further comprises a reclosable opening (21) through which the roll of web material may be inserted into the dispenser.