A new technology to manufacture polypropylene foam sheet and biaxially oriented foam film

Dissertation

Jaakko Raukola

Research output: ThesisDissertationMonograph

1 Citation (Scopus)

Abstract

Foamed polymers are future materials with their wide application spheres. They can be used to enhance appearance as insulating structures or to save material costs. This study addresses all of these and concerns a new technology to produce foamed tubes and films. An entire blown film extrusion line was built up to fulfil the final target, biaxially oriented foam film with closed cell, microcellular foam structure. Extrusion conditions, which in general means temperature, pressure and flow control of viscoelastic material, is discussed and examined experimentally to define the dominating characteristics. Screw and die design together with foam stabilisation is taken under stringent examination, resulting a three layer blown film die focused for foamed extrudates. The effects of chemical foam nucleating agents and physical and chemical foaming are examined during the study concluding in formation of cell embryos by chemical foaming agents and expanding them into low density foam with physically compressed nitrogen gas. The effect of processing parameters in foam structure is examined and adapted according to the polypropylene. The main characteristics of polypropylene were defined by rheological measurements to promote foaming studies in extrusion. Sharp melting point and linear structure of polypropylene caused troubles in keeping the foam structure closed during expansion, but was also partly resolved with new bimodal type polypropylene owing to high melt strength properties. Some applications, leading to new commercialised innovations in foam films, will also be discussed in greater detail.
Original languageEnglish
QualificationDoctor Degree
Awarding Institution
  • Tampere University of Technology (TUT)
Supervisors/Advisors
  • Savolainen, Antti, Supervisor, External person
Award date18 Sep 1998
Place of PublicationEspoo
Publisher
Print ISBNs951-38-5257-1
Publication statusPublished - 1998
MoE publication typeG4 Doctoral dissertation (monograph)

Fingerprint

polypropylenes
foams
films (materials)
manufacturing
foaming
extrusion
foam cells
melting point
screws
strength (mechanics)
polymers
gases
nitrogen
temperature

Keywords

  • cellular materials
  • foamed polymers
  • foam sheets
  • foam films
  • manufacturing
  • polypropylene

Cite this

Raukola, J. (1998). A new technology to manufacture polypropylene foam sheet and biaxially oriented foam film: Dissertation. Espoo: VTT Technical Research Centre of Finland.
Raukola, Jaakko. / A new technology to manufacture polypropylene foam sheet and biaxially oriented foam film : Dissertation. Espoo : VTT Technical Research Centre of Finland, 1998. 101 p.
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abstract = "Foamed polymers are future materials with their wide application spheres. They can be used to enhance appearance as insulating structures or to save material costs. This study addresses all of these and concerns a new technology to produce foamed tubes and films. An entire blown film extrusion line was built up to fulfil the final target, biaxially oriented foam film with closed cell, microcellular foam structure. Extrusion conditions, which in general means temperature, pressure and flow control of viscoelastic material, is discussed and examined experimentally to define the dominating characteristics. Screw and die design together with foam stabilisation is taken under stringent examination, resulting a three layer blown film die focused for foamed extrudates. The effects of chemical foam nucleating agents and physical and chemical foaming are examined during the study concluding in formation of cell embryos by chemical foaming agents and expanding them into low density foam with physically compressed nitrogen gas. The effect of processing parameters in foam structure is examined and adapted according to the polypropylene. The main characteristics of polypropylene were defined by rheological measurements to promote foaming studies in extrusion. Sharp melting point and linear structure of polypropylene caused troubles in keeping the foam structure closed during expansion, but was also partly resolved with new bimodal type polypropylene owing to high melt strength properties. Some applications, leading to new commercialised innovations in foam films, will also be discussed in greater detail.",
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Raukola, J 1998, 'A new technology to manufacture polypropylene foam sheet and biaxially oriented foam film: Dissertation', Doctor Degree, Tampere University of Technology (TUT), Espoo.

A new technology to manufacture polypropylene foam sheet and biaxially oriented foam film : Dissertation. / Raukola, Jaakko.

Espoo : VTT Technical Research Centre of Finland, 1998. 101 p.

Research output: ThesisDissertationMonograph

TY - THES

T1 - A new technology to manufacture polypropylene foam sheet and biaxially oriented foam film

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N2 - Foamed polymers are future materials with their wide application spheres. They can be used to enhance appearance as insulating structures or to save material costs. This study addresses all of these and concerns a new technology to produce foamed tubes and films. An entire blown film extrusion line was built up to fulfil the final target, biaxially oriented foam film with closed cell, microcellular foam structure. Extrusion conditions, which in general means temperature, pressure and flow control of viscoelastic material, is discussed and examined experimentally to define the dominating characteristics. Screw and die design together with foam stabilisation is taken under stringent examination, resulting a three layer blown film die focused for foamed extrudates. The effects of chemical foam nucleating agents and physical and chemical foaming are examined during the study concluding in formation of cell embryos by chemical foaming agents and expanding them into low density foam with physically compressed nitrogen gas. The effect of processing parameters in foam structure is examined and adapted according to the polypropylene. The main characteristics of polypropylene were defined by rheological measurements to promote foaming studies in extrusion. Sharp melting point and linear structure of polypropylene caused troubles in keeping the foam structure closed during expansion, but was also partly resolved with new bimodal type polypropylene owing to high melt strength properties. Some applications, leading to new commercialised innovations in foam films, will also be discussed in greater detail.

AB - Foamed polymers are future materials with their wide application spheres. They can be used to enhance appearance as insulating structures or to save material costs. This study addresses all of these and concerns a new technology to produce foamed tubes and films. An entire blown film extrusion line was built up to fulfil the final target, biaxially oriented foam film with closed cell, microcellular foam structure. Extrusion conditions, which in general means temperature, pressure and flow control of viscoelastic material, is discussed and examined experimentally to define the dominating characteristics. Screw and die design together with foam stabilisation is taken under stringent examination, resulting a three layer blown film die focused for foamed extrudates. The effects of chemical foam nucleating agents and physical and chemical foaming are examined during the study concluding in formation of cell embryos by chemical foaming agents and expanding them into low density foam with physically compressed nitrogen gas. The effect of processing parameters in foam structure is examined and adapted according to the polypropylene. The main characteristics of polypropylene were defined by rheological measurements to promote foaming studies in extrusion. Sharp melting point and linear structure of polypropylene caused troubles in keeping the foam structure closed during expansion, but was also partly resolved with new bimodal type polypropylene owing to high melt strength properties. Some applications, leading to new commercialised innovations in foam films, will also be discussed in greater detail.

KW - cellular materials

KW - foamed polymers

KW - foam sheets

KW - foam films

KW - manufacturing

KW - polypropylene

M3 - Dissertation

SN - 951-38-5257-1

T3 - VTT Publications

PB - VTT Technical Research Centre of Finland

CY - Espoo

ER -

Raukola J. A new technology to manufacture polypropylene foam sheet and biaxially oriented foam film: Dissertation. Espoo: VTT Technical Research Centre of Finland, 1998. 101 p.