Folder-Gluer Movable Bending Plates Prevent Fishtail Defects
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Solution Overview
Problem
Conventional folder-gluer systems often result in a 'fishtail' defect during the folding of corrugated paperboard sheets due to inclined fold lines, which is difficult to correct without causing deformation or scratching of the panels.
Innovation Solution
A folder-gluer system with movable bending members that expand the downstream region of the panels during the bending process, ensuring the fold lines are inclination-free, and utilizing a wheel member to prevent uplift and maintain accurate folding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the distal end of the bending plate is located just at the position of the crease line, then the bending precision is improved, but the corrugated paperboard sheet bulges and the distal end is pinched, causing conveyance failure
Solution Approach 1:
The bending plate is designed with a rounded distal end that gradually approaches the crease line position, preventing sudden pinching and bulging of the paperboard sheet during the bending process, thereby ensuring smooth conveyance while achieving accurate folding
2Reliability
If the distal end of the bending plate is located slightly inwardly from the crease line position, then conveyance reliability is improved, but the fold line shifts inwardly causing fishtail defect
Solution Approach 1:
The bending plate is designed to be movable in the width direction, allowing its position to be dynamically adjusted. This enables the distal end to be positioned at the optimal location for each specific paperboard sheet, preventing both pinching and fishtail defects by adapting to variations in material properties and dimensions
3Manufacturing precision
If pressing members are used to correct fishtail, then the fishtail defect is corrected, but the connection regions undergo deformation, scratching or other damage
Solution Approach 1:
The bending plate position is adjusted in advance during the bending process to prevent fold line shift, eliminating the need for subsequent fishtail correction. This preliminary prevention approach avoids all harmful effects associated with post-bending correction methods
4Volume of moving object
If the box depth dimension is increased, then the box capacity is improved, but the fishtail problem becomes more likely to occur
Solution Approach 1:
The movable bending plate allows for dynamic position adjustment that can accommodate different box depth dimensions. For larger box depths, the bending plate position can be optimized to maintain proper fold line alignment throughout the entire bending process, preventing fishtail defects regardless of the final box size
Data Source
AI summary
Disclosed is a folder-gluer comprises: a conveyance device configured to convey a corrugated paperboard sheet; a pair of bending bars configured to bend a first panel and a fourth panel of the corrugated paperboard sheet from 0 degree to about 90 degrees; a pair of bending plates provided in a zone where the first and fourth panels are bent from 0 degree to about 90 degrees, and configured such that distal ends thereof come into contact, respectively, with crease lines of the first and fourth panels or vicinities of the crease lines, wherein each of the bending plates is configured to be pushed and moved outwardly in a width direction, by a push-out device; a detector configured to detect a position of the corrugated paperboard sheet; and a control device configured to control the push-out device.