Paper Valve Sack Inner Bar with Tear-Open Aid
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Solution Overview
Problem
Paper valve sacks suffer from dusting and moisture sensitivity issues, leading to material loss and contamination during transport and use, especially with fine-grained or powdery filling materials, due to their design and existing sealing methods.
Innovation Solution
Incorporating an inner bar with an opening aid having a higher modulus of elasticity and tensile strength than the inner bar itself, allowing for tool-free opening and enhanced sealing to prevent dusting, and using a tear-off strip or thread for improved handling and transport.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If an inner bar is added to seal the bottom flaps, then dusting and material loss are reduced, but device complexity increases
Solution Approach 1:
The inner bar is divided into a body portion and a separate opening aid portion. The opening aid is attached to the inner bar body and can be pulled to automatically open the sealed bottom flaps, eliminating the need for tools while maintaining the sealing function.
Solution Approach 2:
The opening aid acts as an intermediary element that transfers the pulling force from the user to the inner bar, which in turn opens the bottom flaps. This mediator enables tool-free operation while preserving the sealed structure during transport.
2Reliability
If the valve is sealed with weldable layers and hot air or ultrasonic welding, then sealing effectiveness is improved, but manufacturing complexity and energy consumption increase
Solution Approach 1:
The patent uses a simple glued inner bar instead of complex welding systems. The glue provides sufficient sealing for the intended use, and the inner bar with its opening aid creates a simple mechanical opening system that is easier and cheaper to manufacture than welded valves.
Solution Approach 2:
The patent replaces hot air or ultrasonic welding systems with a simpler mechanical glue-based sealing system. The inner bar provides the sealing function through its physical presence and the opening aid provides the opening function through simple mechanical action, eliminating the need for complex thermal or ultrasonic equipment.
3Loss of substance
If the bottom flaps are folded and glued to seal the valve area, then dusting is reduced, but ease of opening deteriorates
Solution Approach 1:
The opening aid is pre-attached to the inner bar in a specific orientation and position. When the user pulls the opening aid, it automatically triggers the unfolding of the bottom flaps and the opening of the valve, performing the opening action in advance of any manual intervention required.
Solution Approach 2:
The inner bar with the opening aid creates a self-opening mechanism. The pulled opening aid automatically opens the bottom flaps and valve without requiring external tools or complex manual manipulation, making the opening process self-service and user-friendly.
Data Source
Figure 1
AI summary
The invention relates to a paper valve sack having an inner catch (1) which is positioned at the paper sack end (3) lying opposite the paper sack end which has a valve (2). The inner catch (1) comprises an opening auxiliary (4) on the side of the inner catch (1) which faces the interior of the sack, the opening auxiliary (4) having a higher elasticity module than the inner catch. The opening auxiliary, which can be a tear-open strip or a tear-open thread, projects beyond at least one surface end (5) of the inner catch (1). Such a paper valve sack would be used for fine-grained, powdery, and/or free-flowing materials such as, in particular, dry mortar.