PET Tableware Thermal-Transfer Printing with Post-Crystallization
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Solution Overview
Problem
Current tableware materials, such as ceramic and melamine, face issues of fragility, high energy consumption in production, and health risks due to toxic substance release, while PET tableware lacks aesthetic appeal and effective pattern printing capabilities.
Innovation Solution
A method for manufacturing PET tableware with a thermal-transfer printed pattern by incorporating 3-15% inorganic fillers, granulating, molding, and post-crystallizing the PET resin composition, followed by forming a thermal transfer pattern under controlled temperature and vacuum conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If melamine is used for tableware, then cost is reduced and shatterproof property is improved, but health safety deteriorates due to melamine release at 30-40°C
Solution Approach 1:
The patent replaces melamine tableware with PET tableware that can be safely disposed of or recycled, eliminating the health risk of long-term melamine accumulation while maintaining the shatterproof advantage
Solution Approach 2:
The patent changes the material parameter from melamine to PET resin, fundamentally altering the chemical composition to eliminate toxic release while preserving the desired mechanical properties of shatter resistance
2Object-affected harmful factors
If PET is used for tableware, then food safety is improved and recyclability is enhanced, but surface gloss and pattern printing quality deteriorate
Solution Approach 1:
The patent changes the thermal processing parameters by introducing post-crystallization treatment at specific temperatures, which fundamentally alters the surface properties of PET to achieve ceramic-like gloss and enable high-quality pattern printing
Solution Approach 2:
The patent creates a composite structure within the PET material through post-crystallization, combining the base PET polymer with a highly ordered crystalline surface layer that provides enhanced gloss and printability while maintaining the safe, recyclable nature of PET
3Device complexity
If PET tableware is manufactured without post-crystallization, then production process is simpler, but surface smoothness and temperature resistance deteriorate
Solution Approach 1:
The patent optimizes the thermal processing parameters by implementing post-crystallization at controlled temperatures and durations, which significantly improves temperature resistance and surface smoothness while adding only one additional processing step
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 method enhances the surface smoothness and temperature resistance of PET tableware, enabling high-quality, clear, and intact thermal transfer patterns, improving aesthetics and safety, thus replacing melamine tableware.
Implementation Method 1
the PET resin composition is added to a twin-screw extruder and melted at a temperature between 250° C. and 280° C. for granulation
Implementation Method 2
the step of post-crystallizing the tableware article includes heat-treating the tableware article at a temperature between 150° C. and 200° C.
Implementation Method 3
molding the plastic granules into the tableware article and post-crystallizing the tableware article
Implementation Method 4
the step of post-crystallizing the tableware article irradiating the tableware article with infrared rays
Implementation Method 5
the tableware article is subjected to thermal transfer under a vacuum environment with a pressure between 150 torr and 760 torr
Implementation Method 6
forming the thermal transfer printed pattern on a surface of the post-crystallized tableware article
Data Source
AI summary
A method for manufacturing a tableware article having a thermal-transfer printed pattern includes the following steps. Firstly, a PET resin composition including 3 to 15% by weight of an inorganic filler is provided. Next, the PET resin composition is granulated to obtain plastic granules. Then, the plastic granules are molded into the tableware article and the tableware article is post-crystallized. Finally, a thermal transfer printed pattern is printed on a surface of the post-crystallized tableware article.