Molded Pulp Bottle With Expanded Polymer Lining
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Solution Overview
Problem
Conventional plastic drink bottles are inefficient in terms of material usage, contribute to plastic pollution, and require complex fabrication methods, while biodegradable paper and pulp containers lack structural strength for packaging and transportation.
Innovation Solution
A molded pulp container with an integral lining formed using a blow molding process, where an expandable polymer or bioplastic blank is heated and expanded to contact the entire interior of the pulp shell, providing structural support and reducing plastic content.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If thick plastic components are used in conventional drink bottles, then mechanical strength is improved, but material waste and cost increase
Solution Approach 1:
The invention uses a composite structure combining molded pulp (biodegradable material) for the bottle body with a thin plastic lining for barrier properties. This composite approach allows the pulp to provide structural strength while the thin lining provides liquid barrier functionality, reducing overall plastic usage compared to conventional thick plastic bottles.
2Object-generated harmful factors
If paper and pulp containers are used as plastic alternatives, then biodegradability is improved, but structural strength deteriorates
Solution Approach 1:
The molded pulp container is combined with a plastic lining to create a composite structure where the pulp provides biodegradability and the lining provides the necessary structural strength and liquid barrier properties, resolving the contradiction between environmental friendliness and mechanical performance.
Solution Approach 2:
Different materials are applied to different regions of the container - molded pulp for the main body where biodegradability is prioritized, and plastic lining in specific areas where liquid barrier and structural properties are critical, optimizing both environmental and mechanical characteristics.
3Ease of manufacture
If conventional multi-piece fabrication methods are used with separate linings, then manufacturing flexibility is improved, but device complexity and weight increase
Solution Approach 1:
The invention integrates the pulp container body and plastic lining into a single unified structure through co-forming or post-forming processes, eliminating the need for separate assembly steps, adhesives, and multiple components. This merging reduces fabrication complexity and overall weight while maintaining manufacturing flexibility.
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 reduces plastic usage, enhances structural strength, and simplifies the fabrication process, making the container more efficient and environmentally friendly while maintaining aesthetic appeal.
Implementation Method 1
extending the expandable portion of the blank comprises heating at least the expandable portion of the blank
Implementation Method 2
extending the expandable portion of the blank comprises vacuum drawing at least the expandable portion of the blank
Data Source
Figure 1
Figure 2A~2B
Figure 3
AI summary
A container with a shell and lining within its interior is provided. The shell and/or lining can be fabricated from a biodegradable, recyclable, and/or compostable material. The lining can be configured as a parison, a preform, and/or other mass that is capable of being expanded. The lining can be inserted within a cavity of the shell and caused to expand to form an expanded state. The lining, in the expanded state, may be used as a barrier, preventing beverage that is inserted into the container from making contact with the shell. The lining, in the expanded state, may be configured to maintain contact with an inner surface of the shell so as to provide adequate shock absorption. The lining can be a thin film, providing an overall thinner construction and/or an overall lighter construction can be used to fabricate the container.