Valve Bag Fitting Device Using Inverted Air Cushion Alignment
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Solution Overview
Problem
Existing attachment devices for valve bags on rotating packaging machines struggle to achieve high attachment rates with flexible bags lacking sufficient protruding tabs, as they rely on air blasts targeting tabs for alignment, which is inefficient at low speeds and not economically viable.
Innovation Solution
A plug-on attachment device with a gripper holder and blowing device that aligns valve bags using air nozzles acting from the side opposite the grippers, forming an air cushion to reduce friction and enable vertical alignment, even without tabs, utilizing a contact device with an upper stop for defined positioning and additional nozzles for enhanced alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If air blast is used to align valve bags by attacking a tab from below, then alignment is achieved, but attachment rate decreases when tab is insufficient or non-existent
Solution Approach 1:
Instead of blowing from below against the tab as in prior art, the invention blows from the side opposite the tab (the back side of the bag). This inverted approach allows alignment to occur through the air cushion effect on the bag's rear surface, making the alignment process independent of tab presence or size, thereby maintaining high attachment rates even when tabs are insufficient or absent
Solution Approach 2:
The invention utilizes pneumatic principles by creating an air cushion between the air nozzle and the valve bag. The air flow generated by the nozzle forms a cushion that pushes the bag into alignment without direct contact, enabling reliable positioning at high speeds regardless of tab characteristics. This pneumatic mechanism replaces the tab-dependent mechanical approach with a contactless field-based solution
2Productivity
If high attachment rate is achieved with flexible valve bags, then productivity increases, but positioning quality deteriorates without sufficient tabs
Solution Approach 1:
The invention changes the dimensional approach to alignment by acting on the back side of the bag rather than the front tab area. The air nozzle is positioned to blow against the rear surface of the valve bag, creating alignment forces from a different spatial dimension. This allows the flexible bag to be positioned accurately through air cushion pressure distribution across its rear surface, achieving both high speed and high precision simultaneously
3Reliability
If air blast attacks tab from below, then tab alignment works, but friction prevents high-speed operation
Solution Approach 1:
The invention employs pneumatic cushioning to eliminate friction-based contact. By blowing air from the side opposite the tab, an air cushion forms between the nozzle and the bag surface, allowing the bag to be pushed into alignment without mechanical contact. This contactless approach removes friction constraints, enabling high-speed operation while maintaining reliable positioning of flexible valve bags
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
Enables reliable and high-speed attachment of flexible valve bags, achieving attachment rates of over 2500 bags per hour with improved positioning quality, even with bags having no or short flaps, and prevents wrinkles and folding issues.
Implementation Method 1
aligns valve bags using air nozzles acting from the side opposite the grippers, forming an air cushion to reduce friction and enable vertical alignment
Data Source
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Figure 5~6
AI summary
Fitting device (1) for fitting woven and/or stitched valve bags (10) onto a filling spout (101) of a packaging machine (100), having a gripper holder (4) which can be moved between a receiving position (2) and an orientation position (3), and has a gripper (5), in order to grip a valve bag (10) in the receiving position (2), and having a blowing device (6) with an air nozzle (7), in order to orient the valve bag (10) in a defined manner in the orientation position (3). In the orientation position (3), an accommodating space (20) for a portion (10) of the valve bag (2) is formed between the gripper holder (4) and the blowing device (6). The gripper (5) is aligned with the accommodating space (20) from a first side (21), and the nozzle (7) is aligned with the accommodating space (20) from an opposite, second side (22), in order to act on opposite side walls (11, 12) of a valve bag (10) accommodated in the accommodating space (20).