HAIR CARE 45
100.00 95.00 90.00 85.00 80.00 75.00 70.00 65.00
Highest Force (gram-force;gF)
Virgin -
undamaged 93.81
Bleached control (cycle 1)
91.77
Bleached with GRPB (cycle 1)
89.73
Bleached control (cycle 2)
77.50 Treatment cycles
Bleached with GRPB (cycle 2)
85.65
Bleached control (cycle 3)
71.38
Bleached with GRPB (cycle 3)
79.54
Figure 5: Evidence of the strengthening properties of Granrepair Powerbond on bleached hair compared to untreated hair by tensile test after multiple decolouring cycles.
tress treated with the functionalised dimethicone had an improvement of textural conditioning properties relative to the control despite the ‘extreme conditions’.
Anti-Breakage after grooming10 l Method Hair tresses were prepared as previously discussed for 3 cycles and allowed to dry. All experiments were performed after overnight equilibration of the hair at 60% relative humidity at ambient conditions. l Results Tensile experiments provide a measure of
a
hair’s true underlying mechanical properties. However, it is unlikely that consumers make hair quality assessments in the same way. Instead, consumers’ perception of ‘strength’ arises from noticing broken fibres in their brush or comb after grooming, or possibly in the base of the shower after bathing.11
Any treatment that reduces A repeated grooming
experiment simulates this grooming process. Hair tresses were continuously brushed for 2000 strokes with periodic counting of broken fibres.10
snags, entanglements and abrasion can help in substantially lowering the number of broken fibres.
a
In Figure 4, the number of broken fibres collected after 2000 strokes were recorded. Cell 1 was virgin black unbleached hair and lost an average of 34±8 hair fibres. Cell 2 was the control. The hair tress was bleached for 3 cycles without any additive and a mean of 62±8 hair fibres were collected. Cell 3 was bleached for 3 cycles with the functionalised dimethicone and lost 36±11 hair fibres. Hair treated with the additive (Cell 3) shows a 42% reduction in breakage when compared to the hair treated without any additive. The quantity of hair breakage was similar to the virgin hair without the post-treatment of any conditioners. Therefore, the functionalised dimethicone was able to preserve and protect hair fibre integrity, as well as, restore surface lubrication that is lost through multiple cycles of bleaching resulting in reduced breakage.
b b
Figure 6a (top) and 6b (bottom): Granrepair Powerbond treated hair bleached for 3 cycles. (Figure 6a) Surface cuticles are preserved showing no signs of cortex exposure.
September 2018
Figure 7a (top) and 7b (bottom): Control (no additive) – Hair bleached for 3 cycles. Hair fibre tip (Figure 7a) displays cortex exposure and surface cuticle has been stripped.
Improved tensile strength of hair with functionalised dimethicone during the bleaching process l Method Hair tresses were prepared as previously discussed for 3 bleaching cycles. All experiments were performed after overnight equilibration of the hair at 60% relative humidity at ambient conditions. Based on ISO 5079:1995(E), Textile Fibres – Determination of Breaking Force and Elongation at Break of Individual Fibres, hair fibres were obtained after each bleaching cycle and adapted for force measurement testing. Force measurement equipment used was the Imada Digital Force Gauge DS2 attached to the Imada Motorized Test Stand MX2-110. The hair fibres used were 2 inches in length and pulled at a rate of 25 mm/min. l Results The results of the tensile analysis are
PERSONAL CARE EUROPE
Highest Force (gram-force;gF)
Page 1 |
Page 2 |
Page 3 |
Page 4 |
Page 5 |
Page 6 |
Page 7 |
Page 8 |
Page 9 |
Page 10 |
Page 11 |
Page 12 |
Page 13 |
Page 14 |
Page 15 |
Page 16 |
Page 17 |
Page 18 |
Page 19 |
Page 20 |
Page 21 |
Page 22 |
Page 23 |
Page 24 |
Page 25 |
Page 26 |
Page 27 |
Page 28 |
Page 29 |
Page 30 |
Page 31 |
Page 32 |
Page 33 |
Page 34 |
Page 35 |
Page 36 |
Page 37 |
Page 38 |
Page 39 |
Page 40 |
Page 41 |
Page 42 |
Page 43 |
Page 44 |
Page 45 |
Page 46 |
Page 47 |
Page 48 |
Page 49 |
Page 50 |
Page 51 |
Page 52 |
Page 53 |
Page 54 |
Page 55 |
Page 56 |
Page 57 |
Page 58 |
Page 59 |
Page 60 |
Page 61 |
Page 62 |
Page 63 |
Page 64 |
Page 65 |
Page 66 |
Page 67 |
Page 68 |
Page 69 |
Page 70 |
Page 71 |
Page 72 |
Page 73 |
Page 74 |
Page 75 |
Page 76 |
Page 77 |
Page 78 |
Page 79 |
Page 80 |
Page 81 |
Page 82 |
Page 83 |
Page 84 |
Page 85 |
Page 86 |
Page 87 |
Page 88 |
Page 89 |
Page 90 |
Page 91 |
Page 92 |
Page 93 |
Page 94 |
Page 95 |
Page 96 |
Page 97 |
Page 98 |
Page 99 |
Page 100 |
Page 101 |
Page 102 |
Page 103 |
Page 104 |
Page 105 |
Page 106 |
Page 107 |
Page 108 |
Page 109 |
Page 110 |
Page 111 |
Page 112