Sensory Evaluation of Freeze-Dried Facial Mask and Analysis of User Profile

To thoroughly understand market opportunity of freeze-dried facial mask and deeply get insight of consumers’usage behavior and needs,evaluate sensory feelings of 10 screened commercial freeze-dried facial mask products,group test products according to the differences of sensory attributions via Principal Component Analysis(PCA)and Agglomerative Hierarchical Clustering(AHC),pick up the representative products.Freeze-dried facial mask users evaluate satisfaction degree of picked up products and participate survey of usage behavior/cognition.Analyze consumer data by AHC to get consumer segmentations and their profile.The test results show that,sensory data and consumer data,which is from consumers test of screened representative products by performing PCA and AHC on sensory data,can be verified mutually.It is helpful to understand the needs of consumer segmentations and reason to buy by combining sensory data and consumer test.

Comparative Study of Polypropylene Non-Woven Surgical Mask and Locally Manufactured Woven and Knitted Fabrics Facial Masks

The outbreak of coronavirus has led to an increase in the demand for facemasks globally. Unavailability of appropriate polypropylene non-woven fabrics face masks as a result of inadequate supply to satisfy the growing population has brought about the manufacturing of locally fabrics masks to augment or substitute standard medical class facemasks. The study aims at analyzing airflow of these locally manufactured fabrics to determine possible means of transmitting the virus as well as establish comfort of the user of these masks. Standard polypropylene non-woven, woven and knitted fabrics were considered for the study. Air permeability test was conducted on these fabrics using Frazier Air permeability tester. Depending on the property significant variation in the textile fabrics, polypropylene non-woven is widely accepted for facial masks. Nevertheless, this study illustrates that woven and knitted fabrics have more open structures, which allow a high rate of air penetration and so may require two or three layers to prevent antimicrobial or antiviral potential.

Analysis of Vibration Frequencies of Piezoelectric Ceramic Rings as Ultrasonic Transducers in Welding of Facial Mask Production

The explosive demands for facial masks as vital personal protection equipment(PPE)in the wake of Covid-19 have challenged many industries and enterprises in technology and capacity,and the piezoelectric ceramic(PZT)transducers for the production of facial masks in the welding process are in heavy demand.In the earlier days of the epidemic,the supply of ceramic transducers cannot meet its increasing demands,and efforts in materials,development,and production are mobilized to provide the transducers to mask producers for quick production.The simplest solution is presented with the employment of Rayleigh-Ritz method for the vibration analysis,then different materials can be selected to achieve the required frequency and energy standards.The fully tailored method and results can be utilized by the engineers for quick development of the PZT transducers to perform precise function in welding.

Sensory Evaluation of Hydroxy Ethyl Cellulose (HEC) in Facial Mask

An equipment test and sensory evaluation were conducted to identify the compatibility and sensory characteristics of HEC in facial masks. These results were then compared to xanthan gum usage. The equipment test results showed that HEC promoted proper tensile capacity in masks which are made from strong structured fabrics such as medium thick, thick and cross woven & homogenous thin mask fabrics. HEC was found to be more compatible with mask fabrics than xanthan gum. HEC improved mask softness and dampness and had an improved water binding and water retention ability compared to xanthan gum. The split face sensory evaluation results demonstrated that sheet masks containing HEC had improved adhesion and lubricity, provided more moisture to the skin, better elasticity and gloss after use and took longer to dry out. Overall, the panel preferred facial masks which contain HEC.

Research and Application of Nanofiber Technology in Mask Products

In view of the fact that wet-cloth facial masks are complicated in components and low in utilization efficiency of active ingredients,an all-solid-state nanofiber facial mask was innovatively developed.In the paper,brief introductions were given to the formation mechanism,microstructure and structural features of the nanofiber facial mask.High-molecular polymer and active ingredients were directly turned into nano cellosilk and a piece of nanofiber membrane of micrometer thick was span onto the receiving base cloth.Compared with common wet-cloth facial mask,nanofiber facial mask has less additive ingredients but works more effectively.For example,it is easy to apply,good at water retention,excellent in loading capacity and biocompatibility.The paper ended with existing problems with materials of all-solid-state nanofiber facial mask,its development orientation and application prospect.

Beijing Opera Facial Masks As Wall Hangings

In Beijing opera. and many other traditional operas, the jing roles. or warriors, usually have their faces painted in colorful designs to represent various elements of their character. Each color has its own meaning. Red stands for loyalty and bravery: black for courage and honesty. and white is the color of deceitfulness.