Hairdressers are exposed to numerous skin-damaging factors, such as wet work, skin irritants, and thermal changes. Skin protection is a very important factor for the prevention of occupational skin disorders. Therefor...Hairdressers are exposed to numerous skin-damaging factors, such as wet work, skin irritants, and thermal changes. Skin protection is a very important factor for the prevention of occupational skin disorders. Therefore, we evaluated a hand cream that was specially formulated for highly stressed skin with regard to its capability to reduce dry, rough, and scaly skin. The objective of this study was to conduct a controlled use test of a barrier repair cream containing pseudo-ceramide and demonstrate its efficacy for hairdressers with dry, sensitive hands and/or occupational skin disorders. A total of 30 hairdressers (29 females and 1 male, aged 20 - 67) participated in the study. All subjects suffered from dry hands. Subjects applied the test cream on their hands for 28 days (four weeks). For each subject, the skin surface topography of the hands was measured by the Surface Evaluation of Living Skin (SELS) system at day 14 (week 2) and day 28 (week 4). Dryness, scaling, cracking, redness, and itchiness were evaluated and graded by experts at week 2 and week 4, and then compared to baselines. All 30 subjects completed the study. A comparison of the changes from baseline to endpoint revealed a statistically significant reduction in skin roughness, scaling, and volume measured according to SELS. These data were confirmed by photographic documentation. The results were further supported by the expert evaluation. For the symptoms dryness and scaling, improvement could be observed in almost all regions of the hands. In addition, according to subjective assessments of overall hand skin condition and the hand cream, subjects reported clear improvement over time (p value below 0.001) and good efficacy of the product. In this study, the test hand cream showed excellent skin compatibility. Therefore, the hand cream may be effective for hairdressers with dry, sensitive hands and/or occupational skin disorders.展开更多
为了提升对护手霜等黏稠物料的灌装速度,设计了新型双头垂直柱塞式灌装机构,并研究护手霜的流变特性,以及以不同灌装速度对其灌装推力产生的影响。选取市面上有较大占有率的某品牌护手霜为研究对象,利用旋转流变仪对其进行流变试验,并...为了提升对护手霜等黏稠物料的灌装速度,设计了新型双头垂直柱塞式灌装机构,并研究护手霜的流变特性,以及以不同灌装速度对其灌装推力产生的影响。选取市面上有较大占有率的某品牌护手霜为研究对象,利用旋转流变仪对其进行流变试验,并结合流变试验数据对其进行流变方程的拟合以及垂直柱塞式灌装机构设计,最后根据拟合得到的流变方程的参数对护手霜进行灌装流变仿真分析。通过对护手霜进行流变试验以及流变方程拟合发现,护手霜具有非牛顿流体的剪切稀化特性,在采用非牛顿流体幂律黏度模型(Non-Newtonian Power Law model)的流变方程有很好的拟合相关性,且拟合相关性达到了0.98以上。在对护手霜进行灌装仿真模拟,且以最大的灌装速度0.337 m/s对其进行灌装时,需要的最大的灌装推力为2251.145 N。能够为类似护手霜等非牛顿流体的灌装输送生产以及垂直柱塞式灌装机构的设计提供借鉴与理论的指导。展开更多
文摘Hairdressers are exposed to numerous skin-damaging factors, such as wet work, skin irritants, and thermal changes. Skin protection is a very important factor for the prevention of occupational skin disorders. Therefore, we evaluated a hand cream that was specially formulated for highly stressed skin with regard to its capability to reduce dry, rough, and scaly skin. The objective of this study was to conduct a controlled use test of a barrier repair cream containing pseudo-ceramide and demonstrate its efficacy for hairdressers with dry, sensitive hands and/or occupational skin disorders. A total of 30 hairdressers (29 females and 1 male, aged 20 - 67) participated in the study. All subjects suffered from dry hands. Subjects applied the test cream on their hands for 28 days (four weeks). For each subject, the skin surface topography of the hands was measured by the Surface Evaluation of Living Skin (SELS) system at day 14 (week 2) and day 28 (week 4). Dryness, scaling, cracking, redness, and itchiness were evaluated and graded by experts at week 2 and week 4, and then compared to baselines. All 30 subjects completed the study. A comparison of the changes from baseline to endpoint revealed a statistically significant reduction in skin roughness, scaling, and volume measured according to SELS. These data were confirmed by photographic documentation. The results were further supported by the expert evaluation. For the symptoms dryness and scaling, improvement could be observed in almost all regions of the hands. In addition, according to subjective assessments of overall hand skin condition and the hand cream, subjects reported clear improvement over time (p value below 0.001) and good efficacy of the product. In this study, the test hand cream showed excellent skin compatibility. Therefore, the hand cream may be effective for hairdressers with dry, sensitive hands and/or occupational skin disorders.
文摘为了提升对护手霜等黏稠物料的灌装速度,设计了新型双头垂直柱塞式灌装机构,并研究护手霜的流变特性,以及以不同灌装速度对其灌装推力产生的影响。选取市面上有较大占有率的某品牌护手霜为研究对象,利用旋转流变仪对其进行流变试验,并结合流变试验数据对其进行流变方程的拟合以及垂直柱塞式灌装机构设计,最后根据拟合得到的流变方程的参数对护手霜进行灌装流变仿真分析。通过对护手霜进行流变试验以及流变方程拟合发现,护手霜具有非牛顿流体的剪切稀化特性,在采用非牛顿流体幂律黏度模型(Non-Newtonian Power Law model)的流变方程有很好的拟合相关性,且拟合相关性达到了0.98以上。在对护手霜进行灌装仿真模拟,且以最大的灌装速度0.337 m/s对其进行灌装时,需要的最大的灌装推力为2251.145 N。能够为类似护手霜等非牛顿流体的灌装输送生产以及垂直柱塞式灌装机构的设计提供借鉴与理论的指导。
