How to Improve Barrier Performance of PET Bottle Preform?

Nowadays, PET bottle has found its widethrough rotation, and would easily lead to peel of
applications in beverage, dairy, pharmaceuticalslayers. This problem has been resolved by some
and chemistry, etc. This mainly relies on thecompanies: when changing molding chamber,
development of its barrier performanceseveral lines of mold cores moves in the parallel
development. In order to achieve better barrierway which replaces the rotation and avoids layer
performance, the research and control of PETpeeling.
bottle preform barrier property is a must. AtThe above-mentioned progress and applications
present, the following four techniques areon PET bottle preform barrier performances and
commonly applied so as to improve the barriertechnologies have paved the way for carrying out
property of PET bottle preform barrier property.of various barrier performance solutions. High
1. PET Bottle Preform Barrier Property Solution:barrier performance is closely linked to barrier
Multi-layerperformance testing. When testing the barrier
Multi-layer method is also defined as complexperformances of PET packages and PET bottle
injection method. Inject PET backings, and then,preforms, Oxygen Permeability Rate Tester is a
inject barrier material through hot mold core touseful tool. Labthink introduces Labthink PERME
form central barrier layer. This method requiresOX2/230 Oxygen Transmission Rate Test
high skills of the operator and strict qualitySystem for PET bottle and PET bottle preform
control. barrier property testing.
2. PET Bottle Preform Barrier Property Solution:Oxygen transmission rate (OTR) is the most
Raw Material Blendingcommon testing for barrier property testing of
Input barrier material directly into the PET rawPET bottle and PET bottle preform. ASTM F1307,
materials, which is favorable for standard bottleGB/T 19789 and other equal pressure testing
preform process systematically with the preparedmethods are applicable. Isolate the transmission
materials. This method requires no otherchamber with the pre-conditioned specimen to
processing measures, and requires little of theform two separated gas flow system: the testing
operator. However, the blended barrier materialgas flows outside the PET bottle or the bottle
would reduce the transparency of the PET bottlespreform (testing gas can be pure oxygen, or the
and result in turbidity.gas mixture with oxygen); high pure carrying gas
3. PET Bottle Preform Barrier Property Solution:flows inside the bottle or bottle preform. Though
Coatingthe two sides are of the same pressure, the
Coating is to plasma coat on the inner and outeroxygen partial pressures are different. Due to the
sides of the molded bottle preform, thisoxygen concentration differences, oxygen
processing is usually quite complicated.transmits through the package, and is carried to
4. PET Bottle Preform Barrier Property Solution:the sensor which would bring forward accurate
Multi-moldingoxygen quantity in the carrier gas flow so as to
This method starts from the interior molding, andcalculate oxygen transmission rate.
makes multi-layer molding during equal processing Labthink PERME OX2/230 Oxygen Transmission
period. Multi-molding method is quite complicatedRate Test System can provide thorough oxygen
since it requires every layer to be very thin;testing means for barrier property of PET bottle
however, in actual application, mold core may beand PET bottle preform. Besides, this instrument is
deviated by the pressure differences and failed toof master-satellite mode, a master preform can
realize even thickness. Besides, when the firstsupport nine satellite modules; thus, 30 specimens
molding period finishes, the bottle preform has tocan be tested at the same time. Its testing
be transmitted to another molding chamber foraccuracy and technology have both achieved
further molding. This process is accomplishedworld advanced standard.