\n\n\t\t

Measurement analysis Bottle C

\t\t\n\t\t\t

Shoulder

\t\t\n\t\t\t\t\t\t\t\t\t\t
\n\t\t\t\t\t\t\t\t\t\t\"\"\t\t\t\t\t\t\t\t\t\t\t
BOTTLE C – SHOULDER
\nH1: S: 74.56%
\nV3: S: 93.70%
\n\t\t\t\t\t\t\t\t\t\t
\n\t\t

B-Shoulder – best quality

\t\t\n\t\t\t\n\n\n\n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n
Sample and PartSharpness AnisotropySharpnessSharpness HorizontalSharpness VerticalVisible TransmissionHazeHaze HorizontalHaze Vertical
C - SHOULDER6.0%87.384.589.986.53.33.82.8
\n\n\n\t\t\t

Features of the Rhopoint ID

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Rhopoint ID Application Notes – PET Bottles

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Overview

Injection blow moulding, a high speed, large quantity production process, is used for the manufacture of plastic packaging bottles. In this process a polymer (typically PET) is injected into a blow mould to be inflated and cooled.

To ensure consistent quality of the finished product, the accurate control of operating parameters must be ensured. Should problems occur it is essential they are identified quickly to prevent wastage.

Typical problems can include:

  • Orange peel and texturing on external wall surfaces
  • Mould lines or marks
  • Contamination
  • Haze caused by surface roughness and bulk scatter

Using the Rhopoint ID it is possible to identify these problems in order to correct in process
failures.

Process

Example – PET Water Bottles

STEP 1: Three different customer supplied PET bottle samples were tested. Visually, they were all considered to be low haze with a “water white” appearance. Each bottle (A,B and C) was cut into 4 sections, labelled: Neck | Shoulder | Body | Base for measurement on the Rhopoint ID-L.

On closer inspection, the parts from bottle C were visually grainy, generally lower in sharpness and contained visible lines in the material that suggested anisotropy.
STEP 2: As the Rhopoint ID is vertically oriented, sample mounting was very easy, no adaptor or sample holding device was required. The cut samples were simply positioned onto the graticule and a measurement made.
Rhopoint ID

Results

Example – PET Water Bottles

The images and data that follow was taken directly from the Rhopoint ID. Being a camera-based system it has the unique ability to provide detailed images of the measured sample that are very useful to verify problems in the quality of the material.

BOTTLE B – SHOULDER
H1: S: 97.56%
V3: S: 98.22%
BOTTLE C – SHOULDER
H1: S: 74.56%
V3: S: 93.70%

Measurement analysis Bottle B

Shoulder

BOTTLE B – SHOULDER
H1: S: 97.56%
V3: S: 98.22%

B-Shoulder – best quality

  • Low Haze – bottle is perceived as having a “water white”
    appearance.
  • High Sharpness – objects viewed through the material
    appear sharp and clear
  • Low Sharpness Anisotropy – there is no directional
    micro-texture visible in the material
Sample and Part Sharpness Anisotropy Sharpness Sharpness Horizontal Sharpness Vertical Visible Transmission Haze Haze Horizontal Haze Vertical
B - SHOULDER 2.2% 94.9 93.5 95.6 87.0 3.1 3.6 2.7

Measurement analysis Bottle C

Shoulder

BOTTLE C – SHOULDER
H1: S: 74.56%
V3: S: 93.70%

B-Shoulder – best quality

  • Low Haze – bottle is perceived as having a “water white”
    appearance.
  • Lower Sharpness – compared to other samples – on closer inspection a micro-texture was visible in the material.
  • Sharpness Anisotropy – higher than the other samples, a slight direction.
Sample and Part Sharpness Anisotropy Sharpness Sharpness Horizontal Sharpness Vertical Visible Transmission Haze Haze Horizontal Haze Vertical
C - SHOULDER 6.0% 87.3 84.5 89.9 86.5 3.3 3.8 2.8

Features of the Rhopoint ID

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Rhopoint ID Application Notes – PET Bottles

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