Plastic Bag Making Apparatus Protrusion Formation
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Solution Overview
Problem
Existing apparatus for making plastic bags that include an end surface with a protrusion are either complex and costly due to the need for a special web of bottom gusset material, or they lack features like an inlet port and spout, making them simple but functionally limited.
Innovation Solution
An apparatus that superposes first and second webs of panel material, guides them to form folded portions, and uses side gusset material to create side surfaces and an additional end surface with a spout, eliminating the need for a special bottom gusset and allowing for an inlet port and spout integration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a web of bottom gusset material is supplied specially and interposed between the first and second webs of panel material, then the plastic bag can include an end surface with a protrusion, but the apparatus becomes complicated in structure and high in cost
Solution Approach 1:
The invention extracts and eliminates the web of bottom gusset material from the system. Instead of using a separate bottom gusset web, the apparatus forms the protrusion directly from the panel material itself by controlling the folding process, thereby simplifying the apparatus structure and reducing costs while maintaining the capability to produce bags with protrusions
Solution Approach 2:
The panel material is made to serve multiple functions: it forms both the main body of the bag and the protrusion structure. By making the panel material undergo differential folding, it simultaneously creates the flat end surface and the protruding portion, eliminating the need for specialized bottom gusset material and simplifying the overall material requirement
2Device complexity
If the end surface is formed by the first folded portion without a web of bottom gusset material, then the apparatus is simple in structure and low in cost, but the plastic bag cannot include the end surface provided with the protrusion
Solution Approach 1:
The invention applies dynamic control to the folding process. The first folded line is positioned at a specific distance from the side edge, creating a variable geometry in the folded portion. This dynamic folding approach allows the same simple apparatus structure to produce both flat end surfaces and protruding portions by adjusting the folding line position, thereby achieving protrusion formation without complicating the apparatus
3Device complexity
If the first folded line is positioned close to the side edge, then the apparatus structure is simple, but the protrusion cannot be formed with sufficient distance from the side edge
Solution Approach 1:
The invention changes the positional parameter of the first folded line relative to the side edge. By setting the distance between the first folded line and the side edge to be greater than twice the distance between the second folded line and the corresponding side edge, the folding process creates a geometric configuration where the folded portion naturally forms a protrusion with adequate distance from the side edge, achieving both structural simplicity and proper protrusion geometry
Data Source
AI summary
An apparatus successively makes plastic bags each of which includes an end surface provided with a protrusion, without specially supplying a web of bottom gusset material. A first web of panel material is folded along a first folded line at a position adjacent to a side edge of the first web, while a second web of panel material is folded along a second folded line at a position adjacent to a corresponding side edge of the second web. A first folded portion is formed in the first web. There exists a distance between the side edge and the first folded line, which is larger than twice a distance between the corresponding side edge and the second folded line by a predetermined distance, after being folded. The end surface is formed by the first folded portion, the protrusion being formed by the predetermined distance.