Paper Container Expanded Insulating Layer Local Quality
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Solution Overview
Problem
Existing paper-made containers with insulating properties face issues such as increased cost, breakability, and reduced transporting efficiency due to the need for thicker thermoplastic resin layers and increased moisture content, which can lead to excessive expansion and poor appearance.
Innovation Solution
A paper-made container with an expanded insulating layer formed by heating a thermoplastic resin layer, where the expansion inhibiting ink-coated portion contains a resin with a glass transition point of 30° C. or higher, reducing the expansion ratio to 25% or less, and incorporating a vinyl chloride-vinyl acetate copolymer or vinyl chloride-vinyl acetate-maleic acid copolymer with limited vinyl acetate content, to maintain insulating properties without increasing thickness or cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the thickness of the thermoplastic resin layer is increased to enhance insulating effect, then the insulating property is improved, but the cost is significantly increased and the container protrudes outside significantly
Solution Approach 1:
The patent applies local quality by creating an expanded insulating layer only at specific portions of the container where insulation is most needed, rather than uniformly increasing the thermoplastic resin layer thickness across the entire container. This selective expansion provides enhanced insulation at the hands-holding areas while avoiding the cost and protrusion issues of a complete thickening of the resin layer.
2Temperature
If the thickness of the thermoplastic resin layer is increased to enhance insulating effect, then the insulating property is improved, but the container protrudes outside significantly making separation difficult during transportation
Solution Approach 1:
The expanded insulating layer is formed only at specific portions of the container rather than uniformly across the entire container. This localized approach provides sufficient insulation where needed while preventing excessive protrusion that would interfere with the separation and stacking of containers during transportation.
3Temperature
If the moisture content of the paper substrate is increased to enhance insulating effect, then the insulating property is improved, but excessive expansion occurs leading to poor appearance
Solution Approach 1:
The patent applies preliminary action by pre-forming the expanded insulating layer structure before the container is put into service. The thermoplastic resin layer is expanded at specific portions during the manufacturing process to create a controlled insulating structure, preventing uncontrolled excessive expansion that would occur if moisture content alone were increased.
Solution Approach 2:
The patent changes the physical state and structure of the thermoplastic resin layer by expanding it at specific portions, transforming it from a dense uniform layer to a controlled expanded structure. This parameter change provides enhanced insulation without the uncontrolled expansion and appearance deterioration that results from simply increasing moisture content in the paper substrate.
4Temperature
If the depth of the rib is increased to increase the distance between paper container main body and paper-made tubular body, then the insulating effect is improved, but the paper substrate becomes easily breakable
Solution Approach 1:
Instead of increasing the depth of ribs across the entire container, the patent creates localized expanded portions of the thermoplastic resin layer at specific areas where insulation is needed. This provides the insulating effect of deep ribs without the structural weakness and breakability that deep ribs would cause across the entire paper substrate.
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 prevents heat sensation and excessive expansion, maintains insulating properties, and enhances transporting efficiency by reducing the area of contact and frictionally charged voltage, while preventing poor appearance and separation issues during transportation.
Implementation Method 1
an expanded insulating layer formed by expanding a thermoplastic resin layer
Implementation Method 2
the expansion inhibiting ink-coated portion contains a resin with a glass transition point of 30° C. or higher
Data Source
AI summary
A paper-made container, in which it is unlikely to feel the heat at the time of holding the container with a hand and generation of poor appearance due to excessive expansion is prevented, without increasing the thickness of an expanded insulating layer and not resulting in a corresponding deterioration of transporting efficiency, and a method for preparing the paper-made container are provided. The paper-made container of the present invention comprises a container main body consisting of a barrel portion and a bottom plate portion, and an expanded insulating layer consisting of an expanded portion and an expansion-inhibited portion, provided on the side of the outer surface of the barrel portion, in which the expanded insulating layer is formed by heating a thermoplastic resin layer having an expansion inhibiting ink-coated portion, and the ratio of the thickness of the expansion-inhibited portion to the thickness of the expanded portion is 25% or less.