Rotary Die Retainers for Corrugated Board Trim Strippers
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Solution Overview
Problem
Conventional rotary cutting dies for corrugated board suffer from trim strippers bowing and creating gaps between the trim strippers and cutting blades, leading to jamming of cut trim pieces and potential damage to the die board due to excessive forces.
Innovation Solution
The implementation of retainers on the die board to confine trim strippers closely adjacent to the trim cutting blades, combined with preloading devices that gradually load the die cylinder, preventing gaps and abrupt loading.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If trim strippers are made compressible and resilient to engage cut trim pieces, then they can effectively hold and separate trim pieces from the product board, but they tend to bow and create gaps between the trim strippers and trim cutting blades over time
Solution Approach 1:
A retainer is mounted on the die board to preliminarily position and confine the trim stripper between the retainer and the trim cutting blade. This preliminary confinement prevents the trim stripper from bowing away and creating gaps during operation, maintaining consistent contact between the trim stripper and cutting blade throughout the trimming process
2Reliability
If trim strippers are confined between retainers and cutting blades to prevent gap formation, then cut trim pieces will not become jammed, but the device complexity increases due to additional retainers
Solution Approach 1:
The retainer is constructed from a resilient material such as urethane with a durometer of 70-90 Shore 00, allowing it to be compressible and resilient. This flexibility enables the retainer to maintain confinement of the trim stripper while accommodating operational movements, reducing the need for complex rigid retention mechanisms
3Productivity
If the die cylinder is loaded abruptly when trim cutting blades engage corrugated board, then cutting operation begins immediately, but upstream printing operations are disrupted and ink smudging occurs
Solution Approach 1:
A preloading device is mounted on the die board ahead of the leading trim cutting blade that engages the anvil and gradually preloads the die cylinder before the cutting blade engages the corrugated board. This preliminary gradual loading prevents abrupt force transmission to upstream printing operations, eliminating ink smudging while maintaining cutting productivity
4Object-generated harmful factors
If preloading device is used to gradually load the die cylinder, then ink smudging is avoided and printing efficiency is enhanced, but the device complexity increases
Solution Approach 1:
The preloading device serves multiple functions: it gradually loads the die cylinder to prevent ink smudging, maintains consistent pressure during the trimming operation, and works in conjunction with the retainer system to stabilize the overall die board assembly. This multi-functionality reduces the need for separate dedicated components for each function
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
This configuration maintains trim strippers in close proximity to cutting blades, preventing trim pieces from becoming jammed and reduces the risk of die board damage, while also enhancing upstream printing efficiency by avoiding ink smudging.
Implementation Method 1
The trim strippers are compressible and resilient. During the trim cutting process, the trim strippers engage the cut pieces of trim as they pass through the nip and hold the cut pieces of trim against the anvil
Implementation Method 2
A retainer is mounted on the die board closely adjacent the trim strippers such that the trim strippers are confined and disposed between the retainer and the trim cutting blades
Implementation Method 3
The preloading device engages the anvil during the process of trimming and cutting corrugated board and preloads the rotary die cylinder that the die board is mounted on prior to the leading trim cutting blade loading the die cylinder
Data Source
AI summary
A rotary cutting die assembly is provided that includes a die cylinder, an anvil, and a die board mounted to the die cylinder. The die board includes a series of trim cutting blades. Disposed on the outside of each trim cutting blade is a trim stripper. Secured to the die board adjacent the outside of the trim strippers is a series of retainers that generally retain the trim strippers between trip cutting blades and the retainers. This generally prevents cut pieces of trim from being packed and wedged into a gap between the trim cutting blades and the trim strippers.