Hollow-Chamber Plastic Base for Smoked Fish Packaging
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Solution Overview
Problem
Conventional food packaging for fish lacks a balance between low weight, high stability, durability, and food compatibility, often compromising on either weight or durability, and does not inherently resist liquids without special treatments.
Innovation Solution
A hollow-chamber multi-wall sheet made of plastic with a total thickness of less than 2 mm is used as a semi-rigid base, featuring micro-perforation for air permeability and breathability, and a polypropylene material for enhanced durability and liquid resistance, combined with a film-like cover.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If cardboard is used as the base material for food packaging, then the packaging is lightweight, but the mechanical strength and resistance to liquid damage are insufficient
Solution Approach 1:
The patent uses a multi-wall sheet made of plastic (specifically polypropylene) as the base material, replacing traditional cardboard. This composite structure with multiple walls provides enhanced mechanical strength, durability, and inherent liquid resistance while maintaining lightweight properties, thus resolving the contradiction between weight and strength.
Solution Approach 2:
The patent employs a thin plastic base (less than 2 mm thick) with a multi-wall structure that provides flexibility and strength. The plastic material forms a flexible yet durable shell that resists mechanical damage and liquid penetration without requiring special surface treatments, addressing both weight and strength requirements.
2Weight of moving object
If the base thickness is reduced to achieve low weight, then the packaging becomes lightweight, but the deformation resistance and mechanical durability decrease
Solution Approach 1:
The base is designed as a multi-wall sheet with multiple internal walls or chambers, segmenting the internal structure. This segmentation provides structural reinforcement and deformation resistance while keeping the overall thickness and weight low, as the distributed wall structure efficiently resists mechanical stresses.
Solution Approach 2:
The patent transitions from a single-layer thin base to a multi-dimensional multi-wall structure. By adding internal walls and chambers, the structure gains three-dimensional strength and deformation resistance while maintaining a thin overall profile, thus achieving high mechanical performance at low weight.
3Strength
If conventional plastic packaging is used, then durability is improved, but food compatibility and breathability are compromised
Solution Approach 1:
The patent incorporates micro-perforations in the plastic base, creating a porous structure that allows breathability and air permeability. This enables the packaging to maintain durability while being compatible with food storage, as the micro-pores allow controlled gas exchange without compromising the structural integrity or liquid resistance.
4Reliability
If special surface treatments are applied to achieve liquid resistance, then liquid protection is improved, but the manufacturing complexity and cost increase
Solution Approach 1:
The patent uses polypropylene as the base material, which inherently possesses liquid-resistant properties without requiring additional surface treatments. The homogeneous plastic material provides natural protection against liquid penetration, simplifying the manufacturing process and reducing complexity while maintaining reliable liquid resistance.
Data Source
Figure 1~2
AI summary
Food packaging, in particular for smoked fish (12), comprising a plate-shaped, semi-rigid base (14) for the food, and a cover (16) held on the base and covering the food, characterized in that the base (14) is a hollow-chambered sheet made of plastic.