Tearable Joint Line for Tamper-Evident Plastic Food Container
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Solution Overview
Problem
Consumers are concerned about the integrity of food in transparent plastic containers, as there is a risk that another customer may have opened and sampled the contents, leaving germs behind, and existing containers do not provide a secure way to ensure the container has not been opened.
Innovation Solution
A plastic container with a base and lid formed from a single sheet of plastic, where the first sides are joined by a tearable line that can be easily opened by a customer, but initially closed by a clerk, ensuring the container is secure until the customer forces the separation along this line.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the container is made transparent and easily openable, then visibility and ease of access are improved, but security against secret sampling deteriorates
Solution Approach 1:
The container is divided into a base and a lid that can be separated. The join line creates a segmented structure where the lid and base are connected but can be torn apart, providing both ease of opening and evidence of opening.
Solution Approach 2:
The join line is pre-weakened through creasing and bending during manufacturing, creating a predetermined tear path. This preliminary action allows the container to be easily opened by the intended user while maintaining security against unauthorized opening.
2Reliability
If the container requires secure closing to prevent tampering, then reliability is improved, but ease of initial closing by clerks deteriorates
Solution Approach 1:
The container is designed with pre-formed creases and bends at the join line during manufacturing, creating a built-in tear mechanism. This preliminary action allows clerks to easily close containers by simply pressing the lid onto the base without requiring complex sealing operations.
Solution Approach 2:
The container structure itself provides the tamper-evident function through its geometric design of creases and bends. The container is self-sufficient in providing both easy closing and tamper evidence without requiring additional complex mechanisms or materials.
3Reliability
If the container is designed to require tearing to open, then tamper evidence is improved, but manufacturing complexity increases
Solution Approach 1:
The container is made from a flexible plastic sheet that can be easily creased and bent to create the tear mechanism. This flexible material allows for simple manufacturing processes involving folding and creasing rather than complex molding or assembly operations.
Solution Approach 2:
The plastic sheet is segmented into regions that will form the base, lid, and join line through simple folding and creasing operations. This segmentation approach allows the tamper-evident structure to be created through basic forming processes rather than complex multi-step manufacturing.
Data Source
AI summary
A food container formed from plastic, can be loaded with food and then closed by a clerk, and thereafter cannot be opened without tearing apart first sides (24, 26) of the base (12) and lid (16). The container is formed by a single sheet of plastic that forms a base and lid with second sides (20, 22) that are latched together and with adjacent first sides that are joined by a joint line (30) in the plastic that is creased and that has slits (40). At the joint line, the lid has a projecting lid tab (32) and the base has a projecting base tab (36). A person grasps both tabs, and lifts only the lid tab to tear apart the first sides of the base and lid along the joint line (30). Thereafter, the lid can be easily closed and reopened on the base.