Analyzes and Improvements of Creasing Carriage
(2007) MMK820Innovation
- Abstract
- The task consisted in helping Tetra Pak with the problem that they today have with unexplained deformation of their creasing carriages. Tetra Pak uses different carriages depending on which kind of packaging that is to be manufactured. The carriages are hauled in and pulled in to the production line when another type of packaging is to be manufactured. Basically the carriages look the same, the thing that alters is their length and the number of modules placed on the carriage. Depending on how advanced the package is, for example if there is a hole for a straw, perforation and how complex the package is, there can be one to four modules placed on top of each other.
There are two moments that affects the unit to twist. The most interesting... (More) - The task consisted in helping Tetra Pak with the problem that they today have with unexplained deformation of their creasing carriages. Tetra Pak uses different carriages depending on which kind of packaging that is to be manufactured. The carriages are hauled in and pulled in to the production line when another type of packaging is to be manufactured. Basically the carriages look the same, the thing that alters is their length and the number of modules placed on the carriage. Depending on how advanced the package is, for example if there is a hole for a straw, perforation and how complex the package is, there can be one to four modules placed on top of each other.
There are two moments that affects the unit to twist. The most interesting one is generated when the carriage is hauled in and hits a stoppage that is located a short distance from the haul in cylinder and therefore wants to twist the carriage. The other one is due to a belt-drive that is connected to the creasing unit and operates the rotation of the creasing rollers. These two moments causes a twisting of the carriage that results in that the creasing rollers no longer are lying perfectly opposite each other. The result of this is that the creasing pattern is incorrect and can lead to damages on the paper and on the creasing tools. More factors that affects the twisting are temperature, asymmetric design etc, however this report mainly focuses on the two moments.
Measures on creasing unit and computer analyzes with the FEM-programme ANSYS Workbench has be done to design a computerised model that behaves in the same way as the real carriage. When this was achieved different changes could be done on the model such as reinforcements and applying different loads to see how the carriage reacted. Using the best results from different analyzes it was determined that adding a framework under the design the deformation could be reduced to about 50% of its original value. There are solutions for example adding an extra stoppage and lowering the haul in force that can reduce the deformation with even greater values but these analyzes doesn’t have the same reliability (Less)
Please use this url to cite or link to this publication:
http://lup.lub.lu.se/student-papers/record/1502703
- author
- Andersson, Måns and Bengtsson, Christian
- supervisor
- organization
- course
- MMK820
- year
- 2007
- type
- H2 - Master's Degree (Two Years)
- subject
- keywords
- Carriage, Measurements, Creasing, Reinforcements, Displacement, Rollers, FEM-analyzes, Twisting
- language
- English
- id
- 1502703
- date added to LUP
- 2009-11-24 15:35:02
- date last changed
- 2010-02-01 14:40:04
@misc{1502703,
abstract = {{The task consisted in helping Tetra Pak with the problem that they today have with unexplained deformation of their creasing carriages. Tetra Pak uses different carriages depending on which kind of packaging that is to be manufactured. The carriages are hauled in and pulled in to the production line when another type of packaging is to be manufactured. Basically the carriages look the same, the thing that alters is their length and the number of modules placed on the carriage. Depending on how advanced the package is, for example if there is a hole for a straw, perforation and how complex the package is, there can be one to four modules placed on top of each other.
There are two moments that affects the unit to twist. The most interesting one is generated when the carriage is hauled in and hits a stoppage that is located a short distance from the haul in cylinder and therefore wants to twist the carriage. The other one is due to a belt-drive that is connected to the creasing unit and operates the rotation of the creasing rollers. These two moments causes a twisting of the carriage that results in that the creasing rollers no longer are lying perfectly opposite each other. The result of this is that the creasing pattern is incorrect and can lead to damages on the paper and on the creasing tools. More factors that affects the twisting are temperature, asymmetric design etc, however this report mainly focuses on the two moments.
Measures on creasing unit and computer analyzes with the FEM-programme ANSYS Workbench has be done to design a computerised model that behaves in the same way as the real carriage. When this was achieved different changes could be done on the model such as reinforcements and applying different loads to see how the carriage reacted. Using the best results from different analyzes it was determined that adding a framework under the design the deformation could be reduced to about 50% of its original value. There are solutions for example adding an extra stoppage and lowering the haul in force that can reduce the deformation with even greater values but these analyzes doesn’t have the same reliability}},
author = {{Andersson, Måns and Bengtsson, Christian}},
language = {{eng}},
note = {{Student Paper}},
title = {{Analyzes and Improvements of Creasing Carriage}},
year = {{2007}},
}