Brookfield LFRA Texture Analyzer Manuel d'utilisateur télécharger pdf (Page 25)

Brookfield Engineering Labs., Inc. Page 25 Manual No. M/05-370-A1205

LFRA SETTINGS: MODE: Measure force in compression

PLOT: Final

SPEED: 0.1mm/s

-1

DISTANCE: 2; 4; 6mm

OPTION: Normal

TRIGGER: Auto 4g pre-set

PROBE REF: Stainless steel needle probe 10° Taper (Ref: TA9)

Confectionery holding rig

METHOD: Samples were removed from wrappers and broken into individual chunks.

The individual chocolate piece was then held within jaws of confectionery

holder clamped to adjustable bed of LFRA approximately 2mm below

surface probe.

READING:

CONSISTENCY

Total +ve Area

HARDNESS

Peak +ve Force

ADHESION

Total -ve Area

ADHESION FORCE

Peak -ve Force

Note: Graph shows continuation of penetration at 2mm, 4mm

and 6mm parameter values recorded at set points for

each penetration depth.

DISCUSSION: Force:deformation curves generated indicate a linear relationship between

forces generated and depth of penetration. It is therefore recommended

that the 4mm mid penetration value is utilized to permit evaluation of a

range of chocolate types thus enabling comparison of a range of results.

PARAMETER All parameters are automatically calculated within the a test report once

COLLECTION they are selected on the test results tab. Thus calculate parameters for

each curve individually and record results.

PARAMETERS: HARDNESS Force necessary to attain a given deformation

CONSISTENCY Internal strength of bonds within a product

ADHESION Work necessary to overcome attractive forces

between surface of the food and materials with

which it comes into contact.

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Brookfield LFRA Texture Analyzer Manuel d'utilisateur Page 25