K2013 Warpage v2 jr - Clariant · Warpage and Shrinkage Unexpected shrinkage and warpage may be caused by organic pigments. ... Microsoft PowerPoint - K2013 Warpage_v2_jr.pptx Author:

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Business Unit Pigments

Clariant PigmentsWARPAGE

Warpage and Shrinkage

Unexpected shrinkage and warpage may be caused by organic pigments.

The right pigment selection can prevent those effects and customer complaints.

SHRINKAGE = geometric reduction in the size of a part.

The part becomes smaller.

WARPAGE (DISTORTION) = results when “shrinkage” is not uniform.

The part becomes deformed.

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Shrinkage

Geometric reduction

in the size of a part

The part becomes

smaller.

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6060

2,5

l

b

vertical

horizontal

Shrinkage

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Examples for rotational symmetric applications

Rotational moulded casesPipes

Caps/ Closures

Warpage

During injection molding process of HDPE, organic pigments have an influence on crystallization behavior of the polymer.

A number of studies have shown that pigments can affect both: the size of the crystallites and the rate of crystallization

by acting as nucleating agents.

In result organic pigments induce crystallization at higher temperatures than expected.

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Warpage

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Warpage test method

– In the first step 10 HDPE injection molding plates with a size of 60 x 60 mm are produced.In the second step 10 HDPE plates the same size colored with 0.1% organic pigment are made up.

– Processing temperature depending on the pigment stability is 220 °C and 280 °C.

– With a special device the vertical and horizontal length of each plate is measured.

Result is given as:

Difference of the vertical and horizontal change between test plates in natural HDPE and those ones colored with 0.1% pigment is calculated and a warpage category is assigned.

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Hostalen GC 726010 Test plates

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PV Fast® Red HGR10 Test plates

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Special device for measurement

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Warpage category assessment

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% FV = x 100( % Svertical - % Shorizontal )

% Shorizontal

FV = Shrinkage % Slength = Vertical shrinkage in %

vs. natural material% Swidth = Horizontal shrinkage in % vs. natural material

Warpage class 1: FV = 0 - 10 % excellentWarpage class 2: FV = 10 - 20 % suitable, pretests are necessary Warpage class 3: FV = > 20 % unsuitable

Warpage

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60

60

2,5

l

b

vertical

horizontal

If the vertical shrinkage is

higher than the horizontal

shrinkage, the warpage

result has a positive sign.

Warpage Horizontal (%) Vertical (%) Total (%)

PV Fast Red HGR 2,90 3,03 1,10

Warpage

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60

60

2,5

l

b

vertical

horizontal

If the horizontal shrinkage is

higher than the vertical

shrinkage, the warpage

result has a negative sign.

Warpage Horizontal (%) Vertical (%) Total (%)

PV Fast Yellow H9G 2,87 2,84 - 2,24

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Examples for critical applications

Warpage

• Bottle crates• Pallets• Containers• Boxes• Trays

Clariant’s low warping pigments range

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Pigment Color Index Warpage classPV Fast Yellow H9G P.Y.214 2

PV Fast Yellow H4G P.Y.151 2

PV Fast Yellow H2G P.Y.120 1

PV Fast Yellow HG/ HG 01 P.Y.180 1

PV Fast Yellow H2GR P.Y.191 1

PV Fast Yellow HGR P.Y.191 1

Graphtol Yellow H2R P.Y.139 2

PV Fast Yellow H3R P.Y.181 1

PV Fast Orange H4GL 01 P.O.72 1

PV Fast Orange H2GL P.O.64 2

PV Fast Orange 6RL P.O.68 1

Graphtol Red HFG P.O.38 2

PV Fast Red HGR P.R.285 1

Graphtol Red LG P.R.53:1 2

Clariant’s low warping pigments range

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Pigment Color Index Warpage classGraphtol Red F3RK 70 P.R.170 2

PV Fast Red HB P.R.247 1

Graphtol Fire Red 3RLP P.R.48:3 1

Graphtol Red F5RK P.R.170 2

Graphtol Red P2B P.R.48:2 1

PV Fast Red HF4B P.R.187 1

Graphtol Carmine HF4C P.R.185 1

PV Fast Red E4G P.V.19 1

Graphtol Carmine HF3C P.R.176 1

PV Fast Red E3B P.V.19 2

PV Fast Red E5B P.V.19 2

PV Fast Pink E P.R.122 1

PV Fast Pink E 01 P.R.122 1

PV Fast Violet ER P.V.19 2

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