Pixelized Embossed Paper Joint for Tube Wraps
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Solution Overview
Problem
Existing methods for creating joints between paper surfaces, particularly in the tobacco industry, face challenges in achieving permanent and discontinuity-free seals, especially when dealing with varying geometries and high pressures that can lead to degradation and aesthetic issues like varnish blotching.
Innovation Solution
The use of pixelized embossing on thin foil surfaces, where one surface is embossed with elevated and recessed structures that intertwine with a corresponding second surface, either with or without an adhesive layer, to create a joint that is re-sealable and free of discontinuities, utilizing embossing rollers to achieve uniform pressure and prevent structural damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If high pressure is applied during embossing to achieve satisfactory aesthetic quality, then the embossing quality is improved, but the innerliner degrades with varnish blotching on the rear side
Solution Approach 1:
The embossing process is segmented into two independent stages: first embossing the male surface structure, then separately embossing the female surface structure. This segmentation allows each embossing operation to be optimized independently, reducing the need for excessively high pressures that would cause varnish blotching while still achieving satisfactory aesthetic quality.
Solution Approach 2:
The male embossing surface structure is created first as a preliminary step, then the female surface structure is embossed independently based on this pre-existing structure. This preliminary action allows the second embossing to be tailored specifically to achieve the desired aesthetic quality without requiring excessive pressure that would damage the innerliner.
2Strength
If conventional glue is used to create joints between paper surfaces, then the joint strength is improved, but the joint becomes permanent and loses re-sealability
Solution Approach 1:
The chemical bonding mechanism of conventional glue is replaced with a mechanical interlocking system. The pixelized embossed structures on opposing surfaces physically interlock through elevated and recessed features, creating strong joints without permanent adhesion, thereby maintaining re-sealability while achieving sufficient joint strength.
Solution Approach 2:
The bonding mechanism is changed from chemical (glue) to mechanical (interlocking embossed structures). This parameter change in the bonding mechanism allows the joint to be strong yet reversible, enabling re-sealability while maintaining adequate joint strength for the application.
3Manufacturing precision
If uniform pressure is applied during embossing, then the reflectivity is consistent across the surface, but local geometric deviations cause highly variable local embossing pressure
Solution Approach 1:
The embossing process is divided into two independent steps: first creating the male surface structure, then creating the female surface structure separately. This segmentation allows the second embossing to compensate for local geometric deviations by being tailored to the specific male structure, achieving uniform reflectivity without excessive local pressure variation.
Solution Approach 2:
The second embossing operation uses the first embossed surface as a reference template. The female embossing roll is designed to complement the specific geometric features of the male roll, providing feedback-based compensation for local deviations and achieving uniform pressure distribution and reflectivity across the surface.
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 method enables the creation of strong, re-sealable, and aesthetically pleasing joints without the need for conventional glues, ensuring hermetic properties and maintaining freshness in packaging by providing a uniform and adjustable connection that prevents varnish blotching and ensures consistent tightness.
Implementation Method 1
pixelized type embossings on the first portion of surface; and at least a second portion of surface shaped to correspond to the first portion of surface for making the joint between the first portion of surface and the second portion of surface through contact
Implementation Method 2
utilizing embossing rollers to achieve uniform pressure and prevent structural damage
Data Source
AI summary
A set of thin foil surfaces configured to achieve a joint among the foil surfaces, the joint being arranged to be without discontinuity, comprising at least a first portion of surface dedicated to achieve the joint; pixelized type embossings on the first portion of surface; and at least a second portion of surface dedicated to achieve the joint. The second portion of surface is shaped to correspond to the first portion of surface for making the joint between the first portion of surface and the second portion of surface through contact.