Double-Walled Cup Outer Sleeve Curl Fix for Smooth Assembly
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Solution Overview
Problem
The outer sleeve for double-walled cups with an inwardly rolled curled part often catches on the inner cup when slid onto it due to unrolling at the overlap area, leading to an insufficient inner diameter and impaired sliding performance.
Innovation Solution
The curled part is glued or sealed onto the inside of the outer sleeve at the overlap area, preventing unrolling and ensuring a consistent inner diameter, which can be achieved using hot-melt adhesive or heating a synthetic coating, and incorporating a recess design to minimize thickness and facilitate gluing without additional steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an inwardly rolled curled part is applied to the outer sleeve to ensure a sufficiently large gap between inner and outer sleeves, then the insulating properties are improved, but the curled part tends to unroll due to paper material stiffness, reducing the inner diameter and causing the outer sleeve to catch on the inner cup
Solution Approach 1:
The curled part is pre-glued or pre-sealed to the inner side of the outer sleeve in the area of the overlap before assembly. This preliminary action prevents the curled part from unrolling during the assembly process, maintaining the required inner diameter and preventing catching on the inner cup while preserving the insulating gap.
Solution Approach 2:
An adhesive or sealing mechanism is introduced as an intermediary between the curled part and the outer sleeve. This intermediary holds the curled part in its intended position, preventing unrolling and ensuring smooth assembly while maintaining the insulating properties of the double-walled cup.
2Ease of manufacture
If the curled part is not secured, then the manufacturing process is simpler, but the curled part unrolls and reduces the inner diameter causing catching during assembly
Solution Approach 1:
The curled part is pre-secured with adhesive or sealing in the overlap area during the outer sleeve manufacturing process. This preliminary action ensures consistent inner diameter throughout assembly while the curled part remains in its intended position, preventing catching issues.
Solution Approach 2:
The physical state of the interface between the curled part and outer sleeve is changed from unsecured to secured through adhesive bonding or thermal sealing. This parameter change maintains the curled part's position and inner diameter consistency without significantly complicating the manufacturing process.
3Strength
If the outer sleeve thickness is increased in the overlap area for strength, then the structural integrity is improved, but the inner diameter is reduced causing the outer sleeve to catch on the inner cup
Solution Approach 1:
The curled part is secured only in the specific area of the overlap where structural strength is needed, rather than along the entire circumference. This local application maintains structural integrity in the critical overlap region while preserving sufficient inner diameter in other areas to prevent catching during assembly.
Solution Approach 2:
The curled part is pre-secured in the overlap area to prevent unrolling that would reduce the inner diameter. This preliminary action ensures that the thickness increase in the overlap area does not result in catching during assembly, as the curled part remains constrained in its intended position.
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 solution effectively prevents the outer sleeve from catching on the inner cup during sliding, enhancing manufacturing efficiency and maintaining the insulating properties of the double-walled cup, suitable for various cup shapes and materials.
Implementation Method 1
Suitable are for example cold glue, hot glue or in particular a hot-melt adhesive ('Hot-Melt').
Implementation Method 2
The curled part can be sealed on the inside of the outer sleeve by means of heating the synthetic coating.
Data Source
AI summary
An outer sleeve for a double-walled cup and a process for manufacturing the outer sleeve are described, in which a flat-lying blank made from a paper material is joined in a tube shape by means of the overlapping of two longitudinal edges of the blank, and in which the outer sleeve in this form is provided with an inwardly rolled curled part. The curled-in part is glued or sealed onto the inside of outer sleeve in the area of the overlap.