Deep Drawing Packaging Container with Heat Shrinkable Films
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Solution Overview
Problem
Conventional deep drawing packaging methods using non-oriented/non-shrinkable multilayer films result in wrinkles, poor fitting, and a large flange portion, making it difficult to achieve a packaging form similar to bag-type vacuum packaging, especially when packaging irregular shapes like meat.
Innovation Solution
A deep drawing packaging container formed by separately deep drawing a top film and a bottom film, each made of a heat shrinkable multilayer film, with specific drawing ratios and hot-water shrinkability ranges to ensure tight fit and central seal positioning, using films with a thermoplastic resin outer layer, polyamide-based intermediate layer, and sealant resin inner layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If non-oriented/non-shrinkable multilayer films are used for deep drawing packaging, then the packaging process is simple, but the packaged product develops wrinkles and the film lacks fitting property for irregular shapes
Solution Approach 1:
The patent changes the material parameters by using heat shrinkable multilayer films instead of non-oriented/non-shrinkable films. The heat shrinkable properties allow the film to conform to irregular shapes and eliminate wrinkles while maintaining packaging process simplicity through controlled shrinking during or after filling.
2Ease of manufacture
If non-oriented/non-shrinkable multilayer films are used for deep drawing packaging, then the manufacturing process is straightforward, but the flange portion becomes excessively large
Solution Approach 1:
The patent changes the film parameters to heat shrinkable multilayer films with specific shrinkage characteristics. This allows the flange portion to shrink to an appropriate size while maintaining manufacturing simplicity, eliminating the excessively large flange problem.
3Ease of manufacture
If conventional deep drawing packaging methods are used, then the process is simple, but the seal position is eccentrically located in the bottom film side
Solution Approach 1:
The patent changes the film parameters to heat shrinkable multilayer films that shrink uniformly in both longitudinal and transverse directions. This uniform shrinkage ensures the seal position is centrally located rather than eccentrically positioned, while maintaining process simplicity.
4Shape
If heat shrinkable multilayer films with specific drawing ratios are used, then the packaging form becomes similar to bag-type vacuum packaging, but the manufacturing process becomes more complex
Solution Approach 1:
The patent changes the film parameters to heat shrinkable multilayer films with specific drawing ratios (D1=1.1 to 4.0 for top film, D2=1.5 to 5.0 for bottom film). These parameter changes achieve bag-type vacuum packaging form similarity while the increased process complexity is managed through standardized shrinkage control procedures.
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
Prevents wrinkles, reduces flange portion size, and achieves a packaging form similar to bag-type vacuum packaging by centralizing the seal position, enhancing filling efficiency and cost-effectiveness.
Implementation Method 1
a hot-water shrinkability (SM1) in a longitudinal direction and a hot-water shrinkability (ST1) in a transverse direction of the first heat shrinkable multilayer film and a hot-water shrinkability (SM2) in a longitudinal direction and a hot-water shrinkability (ST2) in a transverse direction of the second heat shrinkable multilayer film satisfy the following conditions
Data Source
AI summary
A deep drawn container with a top film made of a first heat shrinkable multilayer film, and a bottom film made of a second heat shrinkable multilayer film. The deep drawn container having a drawing ratio (D1) of the top film and a drawing ratio (D2) of the bottom film satisfying conditions: D1=1.1 to 4.0; D2=1.5 to 5.0; and (D2/D1)=1.05 to 4.55. A hot-water shrinkability of the first heat shrinkable multilayer film in a longitudinal direction (SM1) and in a transverse direction (ST1), and a hot-water shrinkability of the second heat shrinkable multilayer film in a longitudinal direction (SM2) and in a transverse direction (ST2) satisfy conditions: SM1=5 to 40%; ST1=5 to 40%; SM2=2 to 25%; ST2=2 to 25%; (SM1/SM2)=1.2 to 12; and (ST1/ST2)=1.2 to 12.