The Response of Textured Yarn Properties to Process Variables in Relation to Barré

1977 ◽  
Vol 47 (7) ◽  
pp. 477-484 ◽  
Author(s):  
R. Mcgregor ◽  
J. A. Adeimy
Keyword(s):  
Quality Control ◽  
Process Variables ◽  
Yarn Properties ◽  
Control Procedures ◽  
False Twist

The dyeing behavior of conventional false-twist pin-textured polyester yarns has been studied as a function of the texturing variables. Three different dyes and three different dyeing procedures were employed. The data obtained are discussed in relation to existing quality-control procedures for textured yarns and the role of feed-yarn non-uniformity in barré problems.

The Response of Textured Yarn Properties to Process Variables in Relation to Barré

1977 ◽  
Vol 47 (9) ◽  
pp. 598-603 ◽  
Author(s):  
R. McGregor ◽  
P. L. Grady ◽  
T. Montgomery ◽  
J. Adeimy
Keyword(s):  
Quality Control ◽  
Thermomechanical Analysis ◽  
Process Variables ◽  
Yarn Properties ◽  
Analysis Technique ◽  
Wide Range ◽  
False Twist

A thermomechanical analysis technique has been used to characterize a set of false-twist pin-textured polyester yarns. These yams were generated under a wide range of texturing conditions from two distinct lots of fully-drawn feed yarn which differed in orientation. The analysis yielded a variety of thermomechanical yarn parameters. One set of parameters had some of the properties of an “effective yarn-texturing temperature.” A different set of parameters correlated with the tensile, shrinkage, or crimp parameters of the yarns and were sensitive to the effects of feed-yarn orientation differences. Other parameters correlated with textured yarn dyeability. Measurements of this type should prove valuable in the quality control of textured yarns and in the diagnosis of yarn faults.

The Role of Microscopy in Quality Control, Litigation and Forensic Studies of Hides, Skins and Leather

2001 ◽  
Vol 7 (S2) ◽  
pp. 470-471
Author(s):  
Robin H Cross
Keyword(s):  
Quality Control ◽  
Mechanical Damage ◽  
Source Material ◽  
Growth Stages ◽  
Leather Industry ◽  
Chemical Damage ◽  
Control Procedures ◽  
Finishing Processes

The economic importance of animal hides and skins as the source material for the natural leather industry is significant world-wide, and in some countries of the developing world the livelihood of a large proportion of the population depends upon it. Consequently, it is understandable that anything affecting the quality of the source material and the finished product has major economic, industrial and sociological significance. It is also inevitable that a product that is so widely-used in many ways by most of the population will become an important source of evidence in forensic investigations.Quality control procedures in the leather industry involve monitoring the progress of the hides and skins from the growth stages of the animal, through the slaughter, storage, transportation, curing, tanning and finishing processes, to the sale and distribution of the finished product. There are many factors during these stages that can affect quality of finished leather, amongst the most important of which are mechanical and parasite damage during growth, biodeterioration and mechanical damage between slaughter and curing, mechanical, heat and chemical damage during curing, tanning and finishing.

Quality Control in the Printing Process of PT XYZ Printing Packaging Products

2020 ◽  
Vol 7 (11) ◽  
pp. 6308-6313
Author(s):  
Anafil Windriya
Keyword(s):  
Quality Control ◽  
Qualitative Method ◽  
Raw Materials ◽  
Quality Standards ◽  
Literature Study ◽  
Printing Process ◽  
Printing Quality ◽  
Control Procedures ◽  
Collection Methods

This study aimed to determine the role of quality control in the printing process of packaging products printed by PT XYZ. The reason why quality should be emphasized was because a good quality will encourage the business progress and decrease the defect or damage. This study used descriptive qualitative method. The data collection methods were collected through interview, literature study and direct observation by the writer. PT XYZ had set specifications and quality control procedures, but the results of printing packaging product were still unmatched with the specifications. There were 3 stages of XYZ quality control starting from quality control of incoming raw materials, quality control in the production process, and quality control of finishing. The inspections carried out during the printing process aimed to ensure that the printing results met the standards and specifications set by the company as a proof from the customer. Thus, it could reduce the risk of products that did not meet the printing quality standards which later continued to the next process and sent to the customer.

A Statistical Study of Process Variables to Optimize a High Speed Curtain Coater: Part I

TAPPI Journal ◽  
2009 ◽  
Vol 8 (1) ◽  
pp. 20-26 ◽  
Author(s):  
PEEYUSH TRIPATHI ◽  
MARGARET JOYCE ◽  
PAUL D. FLEMING ◽  
MASAHIRO SUGIHARA
Keyword(s):  
Boundary Layer ◽  
Experimental Design ◽  
High Speed ◽  
Statistical Study ◽  
Process Variables ◽  
High Speeds ◽  
The Stability ◽  
Air Removal ◽  
Removal System

Using an experimental design approach, researchers altered process parameters and material prop-erties to stabilize the curtain of a pilot curtain coater at high speeds. Part I of this paper identifies the four significant variables that influence curtain stability. The boundary layer air removal system was critical to the stability of the curtain and base sheet roughness was found to be very important. A shear thinning coating rheology and higher curtain heights improved the curtain stability at high speeds. The sizing of the base sheet affected coverage and cur-tain stability because of its effect on base sheet wettability. The role of surfactant was inconclusive. Part II of this paper will report on further optimization of curtain stability with these four variables using a D-optimal partial-facto-rial design.

Studies and Application of Auger Monitoring System for Quality Control and Assurance of Al Bondpads

2016 ◽  
Author(s):  
Hua Younan
Keyword(s):  
Quality Control ◽  
Sample Preparation ◽  
Monitoring System ◽  
Failure Mechanisms ◽  
Wafer Fabrication ◽  
Contamination Level ◽  
Auger Analysis ◽  
Low Level ◽  
Monitoring Frequency ◽  
Control Procedures

Abstract In wafer fabrication (Fab), Fluorine (F) based gases are used for Al bondpad opening process. Thus, even on a regular Al bondpad, there exists a low level of F contamination. However, the F level has to be controlled at a lower level. If the F level is higher than the control/spec limits, it could cause F-induced corrosion and Al-F defects, resulting in pad discoloration and NSOP problems. In our previous studies [1-5], the theories, characteristics, chemical and physical failure mechanisms and the root causes of the F-induced corrosion and Al-F defects on Al bondpads have been studied. In this paper, we further study F-induced corrosion and propose to establish an Auger monitoring system so as to monitor the F contamination level on Al bondpads in wafer fabrication. Auger monitoring frequency, sample preparation, wafer life, Auger analysis points, control/spec limits and OOC/OOS quality control procedures are also discussed.

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