How To Measure Plastic Preforms

Preform color measurements can be used to verify lot-to-lot consistency, predict final blown bottle color from the preform color and get into target range when switching over a line to a new color.

Spectral measurements in the 360 - 390nm range on an UltraScan PRO and UltraScan VIS can be used to verify the presence of a UV absorber for food grade bottle cut-outs (can also be done on preforms with caution).

Haze measurements of bottle cut-outs are used to verify that internal scattering is minimal from lot-to-lot.

Color measurements of bottle cut-outs are used to verify lot-to-lot consistency and conformance to specification.

Adjustable Preform Holders for ColorQuest and UltraScan
The purpose of a preform holder is to allow consistent placement of the highly curved preform at the measurement port so that a repeatable measurement can be achieved.