Blow Molded PET Bottle Visual Effects via Pulsed Flow
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Solution Overview
Problem
Current methods for creating unique patterns on blow molded articles, such as hair and beauty product containers, are either costly and unsustainable in mass production or result in less durable products, particularly when using extrusion blow molding with polyethylene terephthalate (PET) which produces weaker and hazy articles.
Innovation Solution
The development of a monolayer or multilayer blow molded PET bottle with alternating regions of different compositions, achieved through pulsed flow during the manufacturing of preforms, creating visual effects like ribbons or waves without the need for additional coatings, and enhancing durability and sustainability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If paint or print is applied to create unique patterns, then visual appeal is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The pattern is created during the preform injection molding process itself by controlling the flow of molten resin, rather than applying paint or print afterward. The alternating fast and slow flow rates create the visual pattern as the preform is being formed, integrating the aesthetic function into the primary manufacturing process.
Solution Approach 2:
The molten resin flow itself creates the visual pattern through controlled variations in flow rate. The material's own flow characteristics, when modulated by the injection system, generate the desired visual effects without requiring external patterning operations.
2Shape
If paint or print is applied to create unique patterns, then visual appeal is improved, but durability decreases
Solution Approach 1:
The visual pattern and the structural body of the preform are merged into a single integrated component. The pattern is formed as an intrinsic part of the molded structure through flow control, eliminating the separate paint/print layer that would otherwise be prone to scratching and peeling.
Solution Approach 2:
The visual pattern is created during the preform formation process itself, before the bottling operation. By establishing the pattern as an inherent feature of the molded preform, it becomes integral to the structure and resistant to the mechanical stresses of filling, transit, and use.
3Productivity
If extrusion blow molding is used with PET, then production capability is improved, but article strength and clarity deteriorate
Solution Approach 1:
The injection molding process replaces the extrusion blow molding process for creating the preform. Injection molding provides better control over the molten resin flow and cooling, resulting in stronger, clearer PET articles while maintaining the ability to produce visual patterns through flow rate modulation.
Solution Approach 2:
The processing parameters are changed from extrusion blow molding to injection molding, including temperature control, pressure application, and cooling rates. These parameter changes optimize the PET material properties during forming, achieving both high strength/clarity and the desired visual patterns.
4Productivity
If extrusion blow molding is used with PET, then production capability is improved, but article clarity deteriorates
Solution Approach 1:
Injection molding replaces extrusion blow molding as the primary forming process. The injection process provides more precise control over resin flow and cavity filling, reducing defects and achieving superior optical clarity in the final PET article while maintaining production efficiency.
Solution Approach 2:
Processing parameters such as injection temperature, injection pressure, and cooling rate are optimized for PET material properties. These parameter changes ensure proper crystallization and molecular orientation, resulting in clear, transparent articles with the desired visual patterns.
Data Source
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AI summary
A blow molded monolayer article. The article has a hollow body (250, 25) defined by a wall (30, 31, 3). The wall (30, 31, 3) has one or more regions comprising a first composition and one or more regions formed by a second composition.