Flat Envelope Pocket Structure for Uniform USPS Thickness
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing envelopes do not meet United States Postal Service (USPS) regulations for flexibility, uniform thickness, and size requirements for letter-size and flat-sized pieces, particularly in accommodating goods without causing uneven thickness or rigidity issues.
Innovation Solution
A one-piece blank for making envelopes with expandable pockets, featuring score lines and foldable extensions, allows for the formation of envelopes that conform to USPS regulations by providing secure compartments for goods, ensuring uniform thickness and flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If goods are placed inside the envelope, then the envelope can carry items, but the thickness becomes uneven and exceeds USPS limits
Solution Approach 1:
The envelope is divided into multiple compartments or sections that can independently accommodate goods. This segmentation allows the envelope to distribute the volume of contents across multiple smaller spaces, preventing any single area from creating excessive thickness or unevenness that would violate USPS uniform thickness requirements.
Solution Approach 2:
The envelope utilizes a three-dimensional expandable structure with score lines that allow controlled expansion in specific directions. By designing expansion along multiple dimensions rather than uniform thickness increase, the envelope can accommodate goods volume while maintaining the flat profile required by USPS regulations through strategic folding and compartmentalization.
2Strength
If the envelope is made rigid to protect goods, then protection is improved, but flexibility decreases and it cannot meet USPS requirements
Solution Approach 1:
The envelope employs different structural qualities in different locations: rigid reinforcement elements are placed only where needed for protection (such as at corners or specific compartments), while other areas remain flexible to meet USPS bending requirements. This localized reinforcement maintains overall flexibility while providing targeted protection for goods.
Solution Approach 2:
The envelope combines materials or structural elements with different mechanical properties - integrating flexible base material with localized rigid support structures or reinforcement layers. This composite approach allows the envelope to exhibit both flexibility for USPS compliance and localized strength for goods protection.
3Reliability
If extensions are added to form pockets, then goods can be secured, but device complexity increases
Solution Approach 1:
The pocket extensions and securing elements are pre-formed and integrated into the envelope blank during manufacturing. The score lines, fold lines, and adhesive application areas are predetermined, allowing the pockets to be formed simply by folding and sealing during the envelope assembly process, rather than requiring complex post-manufacturing assembly steps.
Solution Approach 2:
The pocket-forming extensions are integrated directly into the envelope structure as continuous elements rather than separate components. The extensions are formed from the same material sheet as the envelope body, eliminating the need for separate pocket components and reducing overall device complexity while still providing securement functionality.
Data Source
AI summary
In one embodiment, the flat one-piece blank is provided with two extensions that extend from the side flaps to fold over the front panel to form a two pocket center seam construction that qualifies as a flat envelope under USPS regulations. In a second embodiment, the blank is provided with an extension on each side flap that has an end to be folded under and secured to the front panel to form a pair of spaced apart pockets with a third pocket therebetween. In a third embodiment, the blank is provided with an extension on only one side flap to form a pocket