Foamed Paper Container Sheet Lamination for Uniform Insulation
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Solution Overview
Problem
Existing methods for producing heat-insulating foamed paper containers face challenges in achieving uniform foamed layers during high-speed lamination, leading to unevenness and reduced insulation properties.
Innovation Solution
The method involves laminating a polyethylene resin on a paper substrate with specific conditions, including an air gap of 150 mm or larger and a drawing speed of 70 m/min or higher, to ensure uniform foaming without neck-in and maintain productivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If lamination is performed at high speed to maintain productivity, then production efficiency is improved, but unevenness is generated in the foamed layer resulting in lowered heat-insulating properties
Solution Approach 1:
The invention changes the lamination parameters specifically setting the air gap to 50mm or more and drawing speed to 60m/min or more, which resolves the contradiction by finding optimal parameter values that enable both high-speed production and uniform foamed layer formation
Solution Approach 2:
The invention introduces dynamic control of lamination conditions, adjusting air gap and drawing speed within specific ranges to adapt to high-speed production requirements while maintaining foam layer uniformity, transforming the static lamination process into a dynamically optimized process
2Manufacturing precision
If air gap is increased to 150 mm or larger and drawing speed is increased to 70 m/min or higher to prevent neck-in and ensure uniform foaming, then manufacturing precision is improved, but production time increases reducing productivity
Solution Approach 1:
The invention optimizes the parameter combination by setting air gap to 150mm or more and drawing speed to 70m/min or higher, which resolves the contradiction by finding the optimal balance point where both uniformity and productivity requirements are satisfied
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 approach enables the production of a suitable foamed layer with uniform foam cells, enhancing heat-insulating properties and maintaining high production efficiency.
Implementation Method 1
a polyethylene resin with low melting point is laminated on the outer wall surface of a paper container and foamed by heating with utilizing the vapor pressure of moisture contained in paper which is the substrate
Data Source
AI summary
[Problem] The problem that unevenness occurs in the foam layer and the insulating property deteriorates when lamination is carried out at high speed was clarified in a process for producing a sheet for a foam insulating paper container. Specifically, the problem addressed by the present invention is to provide a sheet for a foam insulating paper container that can be foamed without unevenness even when laminated at high speed.[Solution] The present inventors discovered that the problem addressed by the present invention can be solved by a method for producing a sheet for a foam insulating paper container in which a polyethylene resin is laminated on at least one side of a paper substrate, wherein the method for producing a sheet for a foam insulating paper container is characterized in that the lamination conditions are an air gap of 150 mm or greater and a take-off speed of 70 m/min or higher.