PHB Coating Layer for Wider Heat Sealing and Faster Bonding
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Solution Overview
Problem
Conventional laminated articles with a poly(3-hydroxybutyrate) resin layer have limited heat sealing temperature range and require a long time for satisfactory bond strength, leading to low production efficiency.
Innovation Solution
A laminated article design with a coating layer containing poly(3-hydroxybutyrate) resin, featuring specific crystalline melting curve peaks and temperature differences, allows for wide heat sealing temperature range and rapid bond strength development.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If heat sealing is performed at a high temperature to ensure bonding of the resin layer, then bond strength is improved, but a relatively long time needs to pass after heat sealing before satisfactory bond strength is exhibited, leading to low production efficiency
Solution Approach 1:
The invention changes the crystalline structure parameters of the poly(3-hydroxybutyrate) resin by controlling the ratio of crystalline forms (alpha and beta forms) to achieve optimal heat sealing properties. By adjusting the crystalline composition, the resin exhibits both high bond strength and rapid bond development at elevated temperatures, resolving the contradiction between strength and time
Solution Approach 2:
The invention utilizes phase transition characteristics of the poly(3-hydroxybutyrate) resin during heat sealing. The specific crystalline melting behavior and phase transition properties enable the resin to rapidly transition from solid to molten state and back, achieving quick bond strength development while maintaining high bonding strength
2Productivity
If the heat sealing temperature range is widened to improve production efficiency, then productivity is improved, but bond strength may be compromised
Solution Approach 1:
The invention optimizes the crystalline structure parameters of the resin to create a material that maintains stable bond strength across a wide temperature range. This allows the heat sealing process to be performed efficiently at various temperatures without compromising bonding quality, thereby improving productivity
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 design enables efficient heat sealing during molding with improved bond strength in a short time, enhancing production efficiency.
Implementation Method 1
in a crystalline melting curve obtained by differential scanning calorimetry of the coating layer, the coating layer has at least one peak top temperature (Tma) in a range of 100 to 150° C. and at least one peak top temperature (Tmb) in a range of 150 to 170° C.
Implementation Method 2
in a crystalline melting curve obtained by differential scanning calorimetry of the coating layer
Implementation Method 3
the heating temperature usable in bonding by heat sealing of the resin layer during a molding process is limited to a narrow range
Data Source
AI summary
A laminated article includes a base layer and a coating layer disposed over at least one side of the base layer. The coating layer contains a poly(3-hydroxybutyrate) resin. In a crystalline melting curve obtained by differential scanning calorimetry of the coating layer, the coating layer has at least one peak top temperature (Tma) in the range of 100 to 150° C. and at least one peak top temperature (Tmb) in the range of 150 to 170° C., and the difference between the temperatures Tma and Tmb is 10° C. or more.