Peelable Package Sealant Layers for Pressure Integrity
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Solution Overview
Problem
Existing peelable packages fail to maintain seal integrity when exposed to pressure differentials, including the presence or absence of package contents on the sealant layer.
Innovation Solution
A peelable package design featuring a first sealant layer composed of low density polyethylene with a contaminant, such as propylene/ethylene copolymer, and a second sealant layer made of polyethylene polymer with a contaminant like propylene/ethylene copolymer, which are sealed together to form a peelable seal with enhanced burst strength and reduced initial opening force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a sealant layer is designed to bond tightly to substrates, then seal strength is improved, but the package becomes difficult to open
Solution Approach 1:
The sealant layer incorporates a tie layer adhesive with specific adhesive properties that create localized bonding zones. This allows the seal to have strong adhesion to substrates in certain areas while maintaining controlled peelability in other areas, resolving the contradiction between strong sealing and easy opening.
Solution Approach 2:
The sealant layer is formulated as a composite material containing multiple polymer components including polypropylene, polyethylene, and elastomers in specific ratios. This composite structure provides both strong bonding capability and controlled peelability, allowing the seal to adhere tightly during sealing while enabling easy opening afterward.
2Ease of operation
If a peelable seal is designed with easy opening characteristics, then ease of operation is improved, but seal integrity under pressure differentials deteriorates
Solution Approach 1:
The sealant layer uses polymers with specific melt flow rates and molecular weight distributions. The polyethylene component has a melt flow rate of 0.3-2.0 g/10min and the polypropylene has a melt flow rate of 0.5-3.0 g/10min. These parameter specifications ensure the seal maintains integrity under pressure while remaining peelable.
Solution Approach 2:
The seal is designed with pre-established failure zones through the tie layer adhesive configuration. These zones are prepared in advance to allow controlled peeling while the rest of the seal maintains integrity under pressure differentials, enabling easy opening without compromising overall seal reliability.
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 package maintains seal integrity under pressure differentials and allows for easy opening with a significant reduction in initial opening force, ensuring the seal remains intact until manually opened.
Implementation Method 1
a first sealant layer and a second sealant layer which are sealed together to form a peelable seal
Data Source
AI summary
A peelable package is described. The package comprises a first sealant layer comprising low density polyethylene and a first contaminant and a second sealant layer comprising polyethylene polymer, such as high-density polyethylene, low density polyethylene, ethylene alpha-olefin copolymer or blends of such, and a second contaminant. The first contaminant and the second contaminant are selected from the group consisting propylene/ethylene copolymer with ethylene content from about 0.1 mol % to about 5 mol %, polypropylene homopolymer, butene/ethylene copolymer and polybutene homopolymer. The first contaminant of the first sealant layer may be the same as or different than the second contaminant of the second sealant layer. Also described are various embodiments of the first sealant layer, the second sealant layer and the peelable seal that is formed between the first sealant layer and the second sealant layer.