Register Mark Cutting in Bagmaking Film Splice Control
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Solution Overview
Problem
Existing bagmaking and packaging systems face challenges in maintaining productivity and cost efficiency when forming connection portions between films without adjusting the position of the connection, leading to irregular pitch deviations and increased production costs due to defective products.
Innovation Solution
A bagmaking and packaging apparatus that includes a register mark detection unit to identify register marks on films, a connection unit to form connection portions without adjusting their position, and a control unit to cut films based on specific register marks, allowing for accurate cutting and packaging without changing transport speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the pitch between register marks is shortened due to connection portion, then control is performed to temporarily slow down transport speed, but productivity decreases and product cost increases
Solution Approach 1:
The invention converts the harmful effect of irregular pitch (which would normally require slowing down transport speed) into a beneficial outcome by using the irregular pitch information to intelligently select register marks for cutting. Instead of reducing speed to maintain pitch accuracy, the system detects the actual pitch variation and adapts its cutting strategy, thereby maintaining high productivity while ensuring packaging quality.
Solution Approach 2:
The invention changes the parameter selection strategy by dynamically choosing which register mark to use for cutting based on the detected pitch between register marks. When pitch is short, it selects the register mark after the connection portion; when pitch is long, it selects the register mark before the connection portion. This parameter adaptation allows the system to maintain consistent cutting quality without adjusting transport speed.
2Manufacturing precision
If the pitch between register marks is lengthened by skipping register marks near connection portion, then manufacturing precision is maintained, but amount of packaging material used for defective products increases causing cost increase
Solution Approach 1:
The invention dynamically changes the parameter of which register mark to use for cutting based on the detected pitch between register marks. By adapting the register mark selection parameter according to actual pitch conditions, the system maintains manufacturing precision without unnecessarily increasing material waste, thus resolving the contradiction between precision and material efficiency.
3Device complexity
If automatic paper splicing is performed without adjusting connection portion position, then device complexity and cost are reduced, but irregular pitch occurs requiring speed control
Solution Approach 1:
The invention converts the irregular pitch caused by simple automatic splicing into useful information for intelligent register mark selection. Instead of adding complex position adjustment mechanisms, the system uses the pitch variation itself as a signal to adaptively choose cutting parameters, thereby maintaining device simplicity while ensuring packaging quality.
Solution Approach 2:
The system performs self-adjustment by automatically detecting pitch between register marks and autonomously selecting the appropriate register mark for cutting. This self-service mechanism eliminates the need for external position adjustment devices or complex control configurations, maintaining device simplicity while adapting to pitch variations.
Data Source
AI summary
A bagmaking and packaging apparatus includes a transport unit configured to transport a first film or a second film in a film transport direction, a register mark detection unit configured to detect a register mark for position alignment, a bagmaking and packaging unit configured to make an individual packaging bag by cutting the first film or the second film by using a position of the register mark as a reference, and a connection unit configured to form a connection portion. In the first film, in a case where a pitch between a first register mark and a second register mark is shorter than a register mark pitch set in advance, the bagmaking and packaging unit cuts the second film based on a position of a third register mark.