Non-round Plastic Pressurized Dispenser Thermal Stability
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Solution Overview
Problem
Existing plastic pressurized containers face limitations in thermal stability, impact resistance, and chemical resistance, particularly due to their thermal softening points and susceptibility to solvents, which affects their ability to safely contain personal care products and maintain optical clarity.
Innovation Solution
A plastic pressurized package is formed by combining a first material, such as amorphous polyethylene terephthalate (PET) with a second material like polycarbonate (PC), at a ratio greater than 70%, to enhance thermal and chemical resistance, while maintaining high impact resistance and optical clarity, using manufacturing techniques like injection stretch blow molding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If PET is used as the plastic material, then the container is economical and has good optical clarity, but the thermal softening point is low (60-66°C)
Solution Approach 1:
The patent applies composite materials by combining PET with a nucleating agent (such as talc, silica, or calcium carbonate) to create a blended plastic composition. This composite approach allows the container to maintain the economic and optical clarity benefits of PET while achieving improved thermal stability through the nucleating agent's influence on crystallization and glass transition temperature.
2Temperature
If PEN or PAR is used to increase thermal softening point above 90°C, then thermal stability improves, but the material becomes expensive and has yellow hue with poor optical clarity
Solution Approach 1:
The patent applies parameter changes by modifying the thermal properties of PET through the addition of nucleating agents. Instead of switching to entirely different materials like PEN or PAR, the invention changes the parameters of PET by controlling its crystallization and glass transition temperature through chemical additives, thereby achieving improved thermal stability while maintaining optical clarity and cost-effectiveness.
3Ease of manufacture
If existing plastic pressurized containers are used, then they can be manufactured economically, but they cannot survive drop impacts of greater than about 1.83 m (6 feet)
Solution Approach 1:
The patent applies composite materials by incorporating a nucleating agent into the PET matrix to create a blended composition with enhanced mechanical properties. This composite structure improves impact resistance and structural strength while maintaining the economic manufacturing advantages of PET, allowing the container to withstand greater drop impacts than conventional PET containers.
4Ease of manufacture
If PET is used as the plastic material, then the container is economical, but it is susceptible to degradation by common solvents
Solution Approach 1:
The patent applies composite materials by blending PET with nucleating agents that form a more resistant crystalline structure. This composite approach enhances chemical resistance and solvent durability while maintaining the cost-effectiveness of PET, protecting the container from degradation by common solvents found in personal care products.
Data Source
AI summary
A plastic pressurized package comprising a hollow, plastic, substantially non-round cross-section body, comprising a polymer selected from the group consisting of polyamides, polyesters, polyester copolymers, polycarbonates, polyacrylates, polycarbonate copolymers, and mixtures thereof wherein said plastic pressurized package is able to contain and dispense a pressurized fluid of at least about 15 psi greater than atmospheric pressure at 25°C.