Stone Paper Coextrusion for Heat Resistance and Printability
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Solution Overview
Problem
Conventional paper made from wood pulp contributes to deforestation, while synthetic plastic papers lack heat resistance and texture similarity to traditional papers, limiting their application in printing.
Innovation Solution
A stone paper is developed using ground natural stone powder as the main ingredient, combined with a nonmetal thermoconductive material and a small amount of plastic for binding, allowing for heat resistance and anti-static properties, and manufactured through a coextrusion process with a segmental stretching method.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional paper is made from wood pulp, then it can be printed by standard printers, but it contributes to deforestation and environmental damage
Solution Approach 1:
The patent changes the fundamental material composition parameter from wood pulp to ground stone powder mixed with plastic, transforming the paper from a forest-based product to a mineral-based alternative that maintains printability while eliminating deforestation
Solution Approach 2:
The invention creates a composite material combining ground stone powder (calcium carbonate, silica) with plastic binders (polyethylene, polypropylene), achieving both environmental sustainability and functional performance for printing applications
2Object-affected harmful factors
If synthetic plastic paper is used to replace pulp paper, then deforestation can be retarded, but it lacks heat resistance and cannot be used by business printers
Solution Approach 1:
The patent changes the thermal performance parameter by selecting specific plastic binders with high melting points and adding fillers that enhance heat stability, enabling the paper to withstand temperatures required for business printer operation
Solution Approach 2:
The invention creates a composite material combining ground stone powder (calcium carbonate, silica) with plastic binders (polyethylene, polypropylene), achieving both environmental sustainability and functional performance for printing applications
3Ease of manufacture
If plastic paper is used, then production costs may be reduced, but its texture is dissimilar to traditional paper and appearance is plastic-like
Solution Approach 1:
The patent applies local quality by using ground stone powder with specific particle size distributions (fine particles for smooth texture, coarse particles for body) to create different functional zones within the paper structure, achieving both cost-effectiveness and authentic paper-like texture
Solution Approach 2:
The invention changes the physical parameters of the material by controlling the particle size, shape, and distribution of ground stone powder, transforming the appearance from plastic-like to paper-like while maintaining cost advantages
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 stone paper avoids wood pulp usage, provides significant heat resistance and anti-static abilities, enabling its use in printers and printing apparatus, and maintains printability and ink absorption properties.
Implementation Method 1
the stone paper provided by the present invention is compounded with a nonmetal thermoconductive material in order to provide a significantly thermoconductive and anti-static performances
Implementation Method 2
coextruding the first soft material and the second soft material to form a coextruded sheet material
Implementation Method 3
stretching the coextruded sheet material, wherein the coextruded sheet material has a longitudinal direction and a short direction which are on a same plane and are perpendicular to each other
Data Source
AI summary
A stone paper includes a first material layer and a second material layer. The first material layer includes a first inorganic material, a first plastic material, and an additive, wherein the first inorganic material, the first plastic material, and the additive are mixed together. The second material layer is coextruded on at least one surface of the first material layer, and the second material layer includes a second inorganic material, a nonmetal thermoconductive material, and a second plastic material, wherein the second inorganic material, the nonmetal thermoconductive material, and the second plastic material are mixed together. A manufacturing method of a stone paper is also disclosed herein.