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Automatic Valve

Nilsson, Tove (2016) MMK820 20161
Product Development
Abstract
This report describes a part of the product development process for a mechanical adjustment of the head pressure in an extruder at Tetra Pak. The pressure is adjusted by a valve that increases or decreases the pressure by moving a valve stem. In the current solution the valve stem is moved by hand, which will no longer be effective when Tetra Pak streamlines the extruder. The project also includes the search for a new sealing solution to seal around the valve stem. Today's seal leaks causing hot molten polymer leaking out.
The goal of the report was to develop a solution, including a new seal, for adjusting the pressure by mechanically moving the valve stem. A complete solution that was suitable for automation was wanted. Factors that... (More)
This report describes a part of the product development process for a mechanical adjustment of the head pressure in an extruder at Tetra Pak. The pressure is adjusted by a valve that increases or decreases the pressure by moving a valve stem. In the current solution the valve stem is moved by hand, which will no longer be effective when Tetra Pak streamlines the extruder. The project also includes the search for a new sealing solution to seal around the valve stem. Today's seal leaks causing hot molten polymer leaking out.
The goal of the report was to develop a solution, including a new seal, for adjusting the pressure by mechanically moving the valve stem. A complete solution that was suitable for automation was wanted. Factors that made this difficult were the high temperature of 330°C and pressure of 250 bar in the extruder.
Information was gathered throughout the process. The most effective way to gather information was to first search the internet and then ask people who had knowledge in the area.
Concept generation and concept scoring were performed before a concept was chosen. Once a concept had been chosen, it was developed and CAD models of the involving components were made. Structural and heat simulations were made on some of the components.
The new solution consists of a screw jack that will mechanically move the valve stem. Extra components have been developed to provide a complete solution. Among these extra components is a bracket for mounting, a coupling for adjusting the mounting error, eyebolts and suggestions on screws and washers. Two new seals have also been suggested. One of the proposals is designed to fit the existing dimensions while the other is designed for best possible sealing result. (Less)
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author
Nilsson, Tove
supervisor
organization
alternative title
Mechanical movement to adjust the head pressure in the extruder
course
MMK820 20161
year
type
H2 - Master's Degree (Two Years)
subject
keywords
Product development, design, CAD, simulation
language
English
id
8881181
date added to LUP
2016-06-14 14:01:38
date last changed
2016-06-14 14:01:38
@misc{8881181,
  abstract     = {This report describes a part of the product development process for a mechanical adjustment of the head pressure in an extruder at Tetra Pak. The pressure is adjusted by a valve that increases or decreases the pressure by moving a valve stem. In the current solution the valve stem is moved by hand, which will no longer be effective when Tetra Pak streamlines the extruder. The project also includes the search for a new sealing solution to seal around the valve stem. Today's seal leaks causing hot molten polymer leaking out.
The goal of the report was to develop a solution, including a new seal, for adjusting the pressure by mechanically moving the valve stem. A complete solution that was suitable for automation was wanted. Factors that made this difficult were the high temperature of 330°C and pressure of 250 bar in the extruder.
Information was gathered throughout the process. The most effective way to gather information was to first search the internet and then ask people who had knowledge in the area.
Concept generation and concept scoring were performed before a concept was chosen. Once a concept had been chosen, it was developed and CAD models of the involving components were made. Structural and heat simulations were made on some of the components.
The new solution consists of a screw jack that will mechanically move the valve stem. Extra components have been developed to provide a complete solution. Among these extra components is a bracket for mounting, a coupling for adjusting the mounting error, eyebolts and suggestions on screws and washers. Two new seals have also been suggested. One of the proposals is designed to fit the existing dimensions while the other is designed for best possible sealing result.},
  author       = {Nilsson, Tove},
  keyword      = {Product development,design,CAD,simulation},
  language     = {eng},
  note         = {Student Paper},
  title        = {Automatic Valve},
  year         = {2016},
}