Hot Fill Packaging

8/3/2019 Hot Fill Packaging

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South Asian Petrochem Ltd. Hot fill Packaging

Hot fill Packaging:8 Key Aspects

Y.SomasundaramSouth Asian Petrochem Ltd.


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Hot fill: Packaging Objectives

To pack fruit base drinkswithout or with minimumpreservatives.

Natural flavor preserved.

No sodium salts.

Transparent family sizepacking.

Easy and convenient means

to dispense content as perneed.

Unbreakable.

Recyclable.


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PET bottles - Hot fill & Aseptic (USA)

600

1200

2000

2700

3100

0

500

1000

1500

2000

2500

3000

3500

Bottles(m

illion)

Fruit juices

Fruit juices 600 1200 2000 2700 3100

2000 2001 2002 2003 2004


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Hot fill Indian Scenario

Launched by Maa fruits,Dharmapuri & Fruitnik atChennai in end 2003. 28 mm Thick neck bottles, with

higher Tg resins.

Neck crystallized bottles. 500 / 1000 ml bottles

Pepsi launched its hot fill with Slice in 2004. Neck crystallized bottles.

28 mm Alcoa neck.

500ml bottle. Coke followed with Maaza in the same year.

Neck crystallized bottles.

28 mm Alcoa neck.

500ml bottle.


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What is Hot, for a Hot fill

Hot fill temperature (82 deg C)

High acid fruit drinks (< 4.5 pH)

Hot fill temperature (92 deg C)

Low acid fruit drinks (> 4.5 pH > 6.0)

Ex. Tomato juice, low acid tea (green tea)


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1: Resin (PET)

Faster rate ofCrystallization.

Easy process ability.

PET Homo polymer.

Lower IV = 0.76 dl/g.


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2: Preform

High wall thickness to yieldthicker bottle.

Optimum design for strainhardening & crystallinity.

Too much stretching can lead toresidual stresses at final bottle,leading to higher shrinkage

Crystallized neck to withstandtemperature during filling.

Wide / thick neck to avoidcontact of hot liquid &deformation.


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3: Bottle design

Panels to absorb anddissipate vacuum created inbottle during cooling ofcontent.

Base ribs to withstandtemperature and liquid fillingforce.

Rigid circular ribs withstanddeforming forces.

Higher post mold shrinkageallowance in mold design.


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6: Blowing process

Higher preform temperature for blowing.

Hot blow mold surfaces to increase the bottle wall crystallinity through

thermal crystallization. Reduce the orientation stresses in the bottle wall.

Internal cooling of bottle by stretch rod, to harden inner wall beforeejection.

Quick opening of mold cavities to avoid softening of bottle wall aftercooling.


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4: Bottle Performance

Less than 1% thermal shrinkage onhot filling conditions.

Base clearance to be maintained.

No unequal deformation in baseleading to tilting / rocking ofbottles.

No warping at neck seal surface.

No leakage at seal surface.


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5: Closures

Closure material to takecare of contenttemperature at filling.

Single piece closure toavoid the effect ofwarping of wad.

Sealing surfaces to takecare of the expansion &shrinkage during fillingand cooling.


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7: Filling process

Fill close to brimful in crystallizedneck finish.

Fill up to NSR (Neck Support Ring)in non-crystallized neck finish.

Contact of high temperature fillinghead with the Non-crystallizedneck finish avoided.

Quick capping, to avoid productcontact with ambient air & cooling.

Caps to be sterilized beforecapping.


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8: Conditioning

Tilt bottle to wet & warm the closure immediatelyafter capping.

Water shower the bottle to lower temperature, beforeputting on shrink sleeve label.

Water quality in shower to be clean, in order to avoidmold growth between the bottle & shrink film / pilferproof ring.


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Advantages over TetraPak

Content is visible, gives customer the feel ofthe product.

User can see the quantity left out in thecontainer after use.

Environment friendly, easily recyclable.

Higher top load strength so more products can

be stacked and stored in smaller space & alsotransported without damage.


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New development

Panel-less Hot fill bottle

Documents

Hot Fill Packaging