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Mechanical behaviour of tear opening in injection moulded plastic tops

Isaksson, Johan (2004) VSM820
Structural Mechanics
Abstract (Swedish)
The tear opening study is conducted with an example from the Tetra Pak package industry, the Tetra Top package. The top of the package is constructed by a injection molded low density thermoplastic. The package is opened with a tear opening located on the top part.

In order to make tear opening more versatile, studies how opening forces reacts upon material modifications and alternative geometry has been made.

The vertical displacement of the ’drawstring’ (i.e. pull-bridge) concentrate the stress around the tear opening and the shallow pit (e.g. notch) located were the fracture is supposed to initiate.

The fracture initiates and the package opens when sufficient force is applied to the pull-bridge.

The object of this study is how... (More)
The tear opening study is conducted with an example from the Tetra Pak package industry, the Tetra Top package. The top of the package is constructed by a injection molded low density thermoplastic. The package is opened with a tear opening located on the top part.

In order to make tear opening more versatile, studies how opening forces reacts upon material modifications and alternative geometry has been made.

The vertical displacement of the ’drawstring’ (i.e. pull-bridge) concentrate the stress around the tear opening and the shallow pit (e.g. notch) located were the fracture is supposed to initiate.

The fracture initiates and the package opens when sufficient force is applied to the pull-bridge.

The object of this study is how new materials affects the opening force. An alternate tougher material will in all cases increase the opening force. Modified geometry is hence, necessary to decrease the opening force.

Computational studies has shown that a alternate geometry can decrease the opening force with 56%. (Less)
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author
Isaksson, Johan
supervisor
organization
course
VSM820
year
type
H3 - Professional qualifications (4 Years - )
subject
keywords
Tear opening, thermoplastics, fracture mechanics, deformation soften- ing, ABAQUS
report number
TVSM-5127
ISSN
0281-6679
language
English
id
3566743
date added to LUP
2013-08-05 15:07:24
date last changed
2013-10-07 11:37:56
@misc{3566743,
  abstract     = {The tear opening study is conducted with an example from the Tetra Pak package industry, the Tetra Top package. The top of the package is constructed by a injection molded low density thermoplastic. The package is opened with a tear opening located on the top part.

In order to make tear opening more versatile, studies how opening forces reacts upon material modifications and alternative geometry has been made.

The vertical displacement of the ’drawstring’ (i.e. pull-bridge) concentrate the stress around the tear opening and the shallow pit (e.g. notch) located were the fracture is supposed to initiate.

The fracture initiates and the package opens when sufficient force is applied to the pull-bridge.

The object of this study is how new materials affects the opening force. An alternate tougher material will in all cases increase the opening force. Modified geometry is hence, necessary to decrease the opening force.

Computational studies has shown that a alternate geometry can decrease the opening force with 56%.},
  author       = {Isaksson, Johan},
  issn         = {0281-6679},
  keyword      = {Tear opening,thermoplastics,fracture mechanics,deformation soften- ing,ABAQUS},
  language     = {eng},
  note         = {Student Paper},
  title        = {Mechanical behaviour of tear opening in injection moulded plastic tops},
  year         = {2004},
}