PET extrusion coating - taking extrusion coating to a new level Mr. - - PowerPoint PPT Presentation

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PET extrusion coating - taking extrusion coating to a new level Mr. - - PowerPoint PPT Presentation

Apr 23, 2023 196 likes •444 views

PET extrusion coating - taking extrusion coating to a new level Mr. Mikko Peltovuori 10, 7630 PET Extrusion coating Polymer comparison PE vs. PET Equipment Processing Applications 7030 10,1 Mikko Peltovuori 2 Polymer

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SLIDE 1

PET extrusion coating - taking extrusion coating to a new level

  • Mr. Mikko Peltovuori

10, 7630

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SLIDE 2

7030 10,1 Mikko Peltovuori 2

PET Extrusion coating

  • Polymer comparison PE vs. PET
  • Equipment
  • Processing
  • Applications
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SLIDE 3

Polymer comparison PE vs. PET

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SLIDE 4

7030 10,1 Mikko Peltovuori 4

Chemical properties PE vs. PET

PET Synthesis

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SLIDE 5

7030 10,1 Mikko Peltovuori 5

Chemical properties PE vs. PET

PET

  • some natural polarity
  • not branched
  • narrow MWD

Polyethylene

  • non-polar
  • branched
  • broad MWD
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SLIDE 6

7030 10,1 Mikko Peltovuori 6

Physical properties PE vs. PET

PET

  • density about 1.37
  • melting point 245 °C
  • tough/hard

Polyethylene

  • density about 0.91
  • melting point 110 °C
  • soft
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SLIDE 7

Equipment

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SLIDE 8

7030 10,1 Mikko Peltovuori 8

Equipment

  • Drying
  • Motors and extruders
  • Laminator and nip
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SLIDE 9

7030 10,1 Mikko Peltovuori 9

Drying

  • PET has to be dry before processing

– water reverses esterification reaction

  • Water level from 5 000 ppm to 50 ppm
  • Drying

– Temperature 140 °C – Dry air, dew point below -30 °C – Time min 6 hours

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SLIDE 10

7030 10,1 Mikko Peltovuori 10

Drying

  • Transfer dryer to extruder with dry air
  • Transfer piping temperature resistance
  • Hopper design

– Short residence time – Sealed from ambient air

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SLIDE 11

7030 10,1 Mikko Peltovuori 11

Motors and extruders

  • Motors

– PET properties → More torque needed → High motor loads

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SLIDE 12

7030 10,1 Mikko Peltovuori 12

Motors and extruders

  • Extruders

– Low friction screw design – Gentle and quick conveying after melting

  • Screw design PET vs. PE

– Problems? – Solution: multiple extruders

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SLIDE 13

7030 10,1 Mikko Peltovuori 13

Laminator and nip

  • Aim of the design minimal air gap

– Why? Adhesion

  • Melted PET polymer pressed into paperboard fiber

matrix – Mechanical locking

  • High nip pressure
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SLIDE 14

Processing

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SLIDE 15

7030 10,1 Mikko Peltovuori 15

Processing

  • Temperature
  • Adhesion
  • Neck-in
  • Other
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7030 10,1 Mikko Peltovuori 16

Temperature

  • Very narrow temperature window

KEEP YOUR PROCESS IN CONTROL!!

  • Ensure drying
  • Screw design
  • Rpm
  • Temperature setting

– Extremely dependant on equipment

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SLIDE 17

7030 10,1 Mikko Peltovuori 17

Adhesion

  • Laminator and nip design important

– MINIMIZE YOUR AIR GAP!!

  • Flame pretreatment
  • Melt temperature control
  • Extra equipment for low coat weight
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SLIDE 18

7030 10,1 Mikko Peltovuori 18

Neck-in

  • High Neck-in & strong edge waving
  • Minimize your air gap

– short unsupported area

  • Air pins
  • Edge encapsulation
  • Coextrusion
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SLIDE 19

7030 10,1 Mikko Peltovuori 19

Colors

  • Research and testing

– Covering? – Dispersion? – Processing? – Additives?

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SLIDE 20

Applications

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SLIDE 21

7030 10,1 Mikko Peltovuori 21

Applications

  • Temperature
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SLIDE 22

7030 10,1 Mikko Peltovuori 22

Applications

  • Strength