Bag Continuous Band Tubular Structure for Automatic Bag Opening
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Solution Overview
Problem
Existing bag supply devices and continuous bands face difficulties in easily opening the opening portion of bags due to static electricity causing facing surfaces to be in a close contact state, making it hard to separate individual bags without complicated operations.
Innovation Solution
A bag supply device and continuous band design featuring separable tubular portions and guide rods that automatically open and tear the bag opening, allowing easy separation of individual bags without manual pinching, with tubular portions separably connected and tearable along the longitudinal direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If facing surfaces of the opening portion are in a close contact state due to static electricity, then the bag maintains structural integrity during storage and transport, but it becomes difficult to open the opening portion
Solution Approach 1:
The guide rod is inserted into the tubular portion in advance to maintain the close contact state during storage and transport. When opening is needed, the guide rod is pulled out, which automatically separates the facing surfaces and opens the opening portion without requiring manual pinching or complex operations
Solution Approach 2:
The guide rod acts as an intermediary tool that facilitates the opening operation. By inserting and removing the guide rod, the user can easily separate the statically adhered facing surfaces without directly manipulating the bag material, thus solving the difficulty of opening while maintaining structural integrity
2Ease of operation
If pinching pieces protrude from the housing portions to enable opening, then the opening portion can be opened, but the operation becomes complicated
Solution Approach 1:
The opening function is extracted from the bag structure itself and transferred to a separate guide rod tool. The guide rod is inserted into the tubular portion and its removal automatically performs the opening action, eliminating the need for complex pinching pieces protruding from the housing portions
Solution Approach 2:
The guide rod structure enables self-service opening: when the guide rod is pulled out, it automatically separates the facing surfaces of the opening portion through its interaction with the tubular portion, without requiring additional pinching mechanisms or complex user manipulation
3Ease of manufacture
If the bag continuous band uses a simple polyethylene film structure with welded portions and perforations, then manufacturing is simple and cost-effective, but the opening portion cannot be easily opened
Solution Approach 1:
The solution adds a dimensional element by introducing the guide rod as a separate insertable component. The guide rod interacts with the tubular portion in a third dimension (insertion/removal direction), enabling easy opening without changing the basic two-dimensional polyethylene film structure with welded portions and perforations
Solution Approach 2:
The bag continuous band is segmented into distinct functional components: the polyethylene film with welded portions and perforations for structural integrity, the tubular portion for guide rod insertion, and the guide rod itself for facilitating opening. This segmentation allows each component to be optimized for its specific function while maintaining overall manufacturing simplicity
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
The design enables effortless opening and separation of bags, reducing operational complexity and facilitating smooth bag usage.
Implementation Method 1
the distal end portion and the main body portion of each of the guide rods are supported only on a side opposite to the distal end portion
Data Source
AI summary
A bag continuous band includes a support portion in a continuous direction and housing portions adjacent to one side of the support portion. The support portion includes a front tubular portion and a back tubular portion that are continuous along an edge of each housing portion on the support portion side. In addition, front and back surface portions include connection portions in the middle in the continuous direction and connected to tubular portions, and a pair of separation portions over both sides of the connection portions. A pair of guide rods of a bag supply device is inserted into openings of the tubular portions at a start end of the bag continuous band, the tubular portions are supported by the pair of guide rods and separated from the front surface portion and the back surface portion, and an opening portion of a leading bag automatically opened.