Polyamide-Aluminum Cold Forming Packaging
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The tenter method struggles to achieve a satisfactory balance between longitudinal and transverse physical properties during cold forming of laminated sheets with polyamide resin films, leading to breakage of aluminum foils and poor cold formability.
Innovation Solution
A packaging material with a polyamide resin film biaxially stretched using the tenter method, where the stretching magnification factors and distortion caused by tension corresponding to aluminum foil break tension are optimized between 20% and 45% in both directions, integrated with an aluminum foil and an adhesive layer, to prevent breakage and enhance formability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a polyamide resin film is biaxially stretched by the tenter method to improve productivity, then productivity is improved, but the balance between longitudinal and transverse physical properties deteriorates leading to aluminum foil breakage
Solution Approach 1:
The patent applies parameter changes by precisely controlling the stretching magnification factors (TD: 2.0-3.0, MD: 2.0-3.0) and the distortion of the polyamide resin film (20-45% in both directions). By adjusting these parameters within specific ranges, the patent achieves both high productivity through tenter method stretching and maintains excellent cold formability without aluminum foil breakage, resolving the contradiction between productivity and reliability.
2Strength
If the distortion of polyamide resin film is excessively small, then the film is hard to elongate, but the aluminum foil breaks during cold forming
Solution Approach 1:
The patent resolves this contradiction by changing the distortion parameter of the polyamide resin film to a specific range of 20-45% in both longitudinal and transverse directions. This parameter optimization ensures the film has sufficient elongation capability during cold forming while maintaining adequate strength to prevent aluminum foil breakage.
3Ease of operation
If the distortion of polyamide resin film is excessively large, then the film elongates excessively, but the aluminum foil breaks
Solution Approach 1:
The patent addresses this contradiction by precisely controlling the distortion parameter within the range of 20-45%. This controlled parameter change ensures sufficient formability for easy operation while preventing excessive elongation that would lead to aluminum foil breakage, thus maintaining reliability.
4Reliability
If aluminum foil is used for the container to enhance preservability, then gas barrier property and moisture proofness are improved, but formability deteriorates and the foil tends to break
Solution Approach 1:
The patent applies composite materials by creating a laminated structure consisting of a polyamide resin film layer and an aluminum foil layer. The polyamide resin film provides the necessary formability and protects the aluminum foil from breakage during cold forming, while the aluminum foil layer maintains excellent gas barrier and moisture proof properties, thus resolving the contradiction between preservability and ease of manufacture.
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
This approach significantly improves cold formability by preventing aluminum foil breakage and ensuring a reliable press-through pack, with distortion within the specified range allowing for balanced elongation and adhesion, thus facilitating the formation of containers with multiple cavities.
Implementation Method 1
a polyamide resin film biaxially stretched based on a tenter method
Implementation Method 2
the distortion of the polyamide resin film caused by applying thereto a tension corresponding to the tensile break tension of the aluminum foil is 20% or more and 45% or less
Implementation Method 3
an adhesive layer formed between the polyamide resin film and the aluminum foil
Implementation Method 4
aluminum foil has been used as the material for the container 3 in order to enhance the preservability of medicaments by imparting gas barrier property or moisture proofness
Data Source
Figure 1
AI summary
The packaging material for cold forming of the present invention includes a polyamide resin film biaxially stretched by a tenter method and an aluminum foil provided on one surface of the polyamide resin film and integrated with the polyamide resin film. The distortion of the polyamide resin film caused by applying thereto a tension corresponding to the tensile break tension of the aluminum foil is 20% or more and 45% or less. Herewith, it is possible to provide a packaging material for cold forming excellent in cold formability, capable of suppressing the breakage of the aluminum foil during the cold forming in the case where the polyamide resin film biaxially stretched by the tenter method is used.