Compression Blow Formed HDPE Containers Crystallinity
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Solution Overview
Problem
High-density polyethylene (HDPE) resins used in containers have limitations in barrier properties, such as oxygen and moisture transmission, which restrict the shelf life of stored products, and the extrusion or blow forming processes often result in inconsistent container thickness and quality.
Innovation Solution
Compression blow forming of HDPE resin with specific characteristics, including a halftime of crystallization of less than 2 minutes at 124°C, a density of at least 0.955 g/cm³, and a die swell of less than 1.5, to enhance barrier properties and consistency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If extrusion or blow forming processes are used to make HDPE containers, then production efficiency is improved, but container thickness consistency and quality deteriorate
Solution Approach 1:
The patent specifies precise resin parameters (halftime of crystallization less than 2 minutes at 124°C, density of at least 0.955 g/cm³, die swell of less than 1.5) to optimize the compression blow forming process. These parameter changes enable the process to produce containers with both high productivity and improved thickness consistency, resolving the contradiction between production efficiency and manufacturing precision.
2Ease of manufacture
If standard HDPE resins are used in containers, then ease of manufacture is improved, but barrier properties against oxygen and moisture transmission deteriorate
Solution Approach 1:
The patent changes the chemical and physical parameters of the HDPE resin by specifying a halftime of crystallization of less than 2 minutes at 124°C, density of at least 0.955 g/cm³, and die swell of less than 1.5. These parameter changes enhance the barrier properties against oxygen and moisture transmission while maintaining ease of manufacture through compression blow forming.
Solution Approach 2:
The patent utilizes the crystallization phase transition of HDPE resin, specifying a halftime of crystallization of less than 2 minutes at 124°C. This controlled phase transition during cooling enhances the crystallinity and density of the container walls, thereby improving barrier properties against oxygen and moisture transmission while maintaining manufacturing ease.
3Duration of action of stationary object
If HDPE containers with improved barrier properties are produced, then shelf life of stored products is improved, but manufacturing complexity increases
Solution Approach 1:
The patent specifies precise resin parameters (halftime of crystallization less than 2 minutes at 124°C, density of at least 0.955 g/cm³, die swell of less than 1.5) that enable improved barrier properties and extended shelf life. These parameter changes are implemented through a relatively simple compression blow forming process, avoiding significant increases in manufacturing complexity while achieving enhanced product protection.
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 improves the barrier properties of HDPE containers by achieving a higher degree of crystallinity and reduced molecular weight distribution, leading to lower moisture vapor transmission rates and better consistency, meeting regulatory requirements like US FDA GMP and USP standards.
Implementation Method 1
compression blow forming an HDPE resin characterized by: a halftime of crystallization of less than 2 minutes when measured at 124° C.
Implementation Method 2
a halftime of crystallization of less than 2 minutes when measured at 124° C.
Data Source
AI summary
Compression blow formed articles having improved barrier properties and methods of making the same are provided herein.