Polyhydroxyalkanoate Resin Lamination via Superheated Steam
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Solution Overview
Problem
Existing methods for producing laminates with a poly(hydroxyalkanoate) resin layer suffer from non-uniformity and molecular weight loss during heating, leading to adhesion and resistance issues.
Innovation Solution
Applying an aqueous dispersion of poly(hydroxyalkanoate) resin to a substrate and heating the coating using superheated steam to a surface temperature 10 to 100° C. above the resin's melting point, ensuring uniform fusion of the resin.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the temperature during heating and drying is set high, then the drying efficiency is improved, but the poly(hydroxyalkanoate) resin suffers from significant loss in molecular weight
Solution Approach 1:
The invention changes the heating parameters by using superheated steam at a controlled temperature range (10 to 100°C above the melting point of the poly(hydroxyalkanoate) resin) instead of high-temperature conventional heating. This parameter optimization allows efficient drying and resin fusion while preventing excessive molecular weight loss that would occur at higher temperatures.
Solution Approach 2:
The invention utilizes the phase transition of water in the aqueous dispersion from liquid to vapor through controlled heating with superheated steam. This phase transition enables efficient moisture removal while the controlled temperature ensures the poly(hydroxyalkanoate) resin melts and fuses uniformly without decomposing or losing significant molecular weight.
2Device complexity
If conventional heating methods are used, then the heating process is simple, but the resin layer lacks uniformity and contains particulate portions or voids
Solution Approach 1:
The invention employs superheated steam heating that utilizes phase transition to achieve uniform heat distribution throughout the resin layer. The steam condenses and releases latent heat, ensuring thorough and uniform heating that melts the poly(hydroxyalkanoate) resin evenly, eliminating particulate portions and voids while maintaining manufacturing process simplicity.
3Speed
If high temperature heating is applied, then the resin fuses quickly, but the resin layer exhibits cracks and the laminate shows curling and loss of tearing resistance
Solution Approach 1:
The invention optimizes the heating temperature parameter by using superheated steam at a specific temperature range (10 to 100°C above the melting point of the resin). This controlled parameter change enables sufficiently fast resin fusion while preventing excessive temperature that would cause cracks, curling, and loss of tearing resistance in the final laminate product.
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 improves the uniformity of the resin layer, maintains molecular weight, and prevents heating-induced defects such as curling and loss of tearing resistance, while enhancing adhesion and resistance properties.
Implementation Method 1
the coating is heated using superheated steam to a surface temperature 10 to 100° C. above a melting point (Tm) of the poly(hydroxyalkanoate) resin
Implementation Method 2
forming the resin layer by fusing the poly(hydroxyalkanoate) resin through heating of the coating
Implementation Method 3
the coating is heated using superheated steam
Data Source
AI summary
A method of forming a laminated article that includes a substrate and a resin layer. The method includes forming a coating on a substrate by applying an aqueous dispersion of a poly(hydroxyalkanoate) resin to the substrate. Subsequently, the resin layer is formed by fusing the poly(hydroxyalkanoate) resin by heating the coating. The coating can be heated using superheated steam to a surface temperature 10 to 100° C. above a melting point (Tm) of the poly(hydroxyalkanoate) resin.