Selective Spray Coating for Fiber Microwavable Bowls
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Solution Overview
Problem
Existing fiber-based packaging technologies are not well suited for use with meat, poultry, prepared food, produce, or microwavable food containers due to challenges in integrating effective oil, water, vapor, and oxygen barriers, which are cumbersome, time-consuming, and expensive.
Innovation Solution
The use of selective combinations of slurry chemistries and surface coatings, including spray coating techniques, to apply moisture, oil, and vapor barriers to vacuum-formed fiber containers, enhancing their performance and cost-effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional plastic containers are used, then barrier performance and structural integrity are achieved, but environmental pollution and non-biodegradability occur
Solution Approach 1:
The patent changes the material parameter from plastic to fiber-based materials (paper, cardboard, wood pulp) while maintaining barrier performance through selective spray coating applications. This substitution eliminates plastic pollution while achieving comparable protective functions for food containers.
Solution Approach 2:
The patent creates composite structures by combining fiber-based materials with spray-applied barrier coatings (acrylic, polyurethane, epoxy). This composite approach provides both the environmental benefits of biodegradable fibers and the protective barrier properties traditionally achieved only through plastics.
2Reliability
If multiple barrier layers are integrated into fiber containers, then oil, water, vapor, and oxygen barriers are achieved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent applies barrier coatings to the interior surfaces of fiber containers through spray coating techniques during or after the forming process. This preliminary action ensures barrier layers are in place before food packaging, eliminating the need for complex multi-layer integration during manufacturing.
Solution Approach 2:
The patent applies different barrier coating types to different regions of the container based on specific protection needs. For example, oil barriers are applied to interior surfaces contacting fatty foods, while vapor barriers are applied to regions requiring moisture protection. This localized approach reduces overall manufacturing complexity compared to applying all barrier types uniformly throughout.
3Reliability
If spray coating is applied to fiber containers, then barrier performance is improved, but manufacturing time and cost increase
Solution Approach 1:
The patent integrates spray coating into the existing fiber container manufacturing workflow, applying barriers continuously during or immediately after the forming process. This continuous action eliminates separate barrier application steps and maintains manufacturing throughput while ensuring proper barrier performance.
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 solution enables fiber-based packaging to replace plastic containers in various applications by providing effective barriers, improving shelf life and structural rigidity, while being environmentally friendly and cost-competitive.
Implementation Method 1
spray coating techniques, including spray coating techniques, to apply moisture, oil, and vapor barriers to vacuum-formed fiber containers
Implementation Method 2
applying a coating to the interior surface of the container
Implementation Method 3
A vacuum is drawn across the screen to build up fiber particles into the shape of the finished product
Implementation Method 4
The vacuum pulls the slurry onto the mold to form the shape of the package
Implementation Method 5
selective combinations of slurry chemistries and surface coatings to yield desired oil, water, vapor, and/or oxygen barriers
Data Source
AI summary
Methods and apparatus for vacuum forming and subsequently applying topical coatings fiber-based food containers. The slurry includes one or more of an embedded moisture barrier, vapor barrier, and oil barrier, and the topical coating comprises one or more of a vapor barrier, a moisture barrier, an oil barrier, and an oxygen barrier. For food containers having deep sidewalls, a spray coating system includes a first nozzle for applying a full cone spray pattern to the bottom surface of the container, and a second nozzle for applying a hollow cone spray pattern to the inside surfaces of the side walls.