The impact of a change in some of the operational methods used in the production of polyethylene yarn on her performance career

This research aims to study the effect of the change in some of the operational methods used in the production of polyethylene fibers on functional performance.

The importance of this research is to determine the best operating techniques to obtain fibers of high quality. This study clarified that the change in some technological parameters such as the speed of screw and the distance between the spinnter and cooling bath, beside the amount of   additives such as stabilizer against ultraviolet radiation and pigment additives, greatly affects on the characteristics of produced yarn ,and its functional performance. The research samples produced using a high-density polyethylene and using the following  technological variables :

• Speed ​​of screw: (30.40, 50) roll / minute.
• The distance between the spinnter and cooling bath (3.4, 5) cm.
• The percentage of  stabilizer additive, (0,8% ,1%, 1.2%).
• The percentage of the  masterbatch additive,  (0,4%, 0,6% , 0,8%).

This study contains three main parts

Part I: The previous studies

This part contains a compilation of previous research and studies on the subject of research.

Part II: practical experience and laboratory tests

• Specifications of the raw materials used.

• Specifications of  machine used.

•  Specifications of produced yarn.

• Laboratory tests.

Part III: Results and Discussion

This part included records the results of tests, and analysis of these results using statistical relationships, inter relationships between  the different variables of search and the properties of yarn. To determine the best operating technique for producing fibers with the highest  

The results of the tests are as follows:

First: the relationship between the properties and research variables

1. No of yarn Test :

• There is a direct relationship between the speed of screw and number of produced yarns .

• There is a direct relationship of the distance between the spinnter and cooling bath and number of yarns for samples with against UV, but there is an inverse relationship of the distance between the spinnter and cooling bath and number of dyed yarns.

• There is a direct relationship between the amount of additives and number of produced yarns.

2. Tensile Strength Test:

• There is a direct relationship between the speed of screw and  tensile strength of produced yarns .

• There is an inverse relationship of the distance between the spinnter and cooling bath and tensile strength of yarns.

• There is an inverse relationship between the amount of additives and tensile strength of produced yarns.

3. Percentage Elongation Test:

• There is a direct relationship between the speed of screw and  elongation of produced yarns .

• There is a direct relationship between the distance between the spinnter and cooling bath and elongation of yarns.

• There is an inverse relationship between the amount of additives and elongation of produced yarns.

4. Frictional Resistance Test:

• There is a direct relationship between the speed of screw and  frictional resistance of produced yarns .

• There is a direct relationship of the distance between the spinnter and cooling bath and frictional resistance of yarns.

• There is an inverse relationship between the amount of additives and Frictional resistance of produced yarns samples with additives against UV, but there is a direct relationship the amount of additives and Frictional resistance of produced yarns samples with masterbatch.

5.Color intensity:

• There is a direct relation between the speed of screw and  intensity of color of  produced yarns .

• There is a direct relationship of the distance between the spinnter and cooling bath and intensity of color of  produced yarns .

• There is a direct relationship between the amount of masterbatch and intensity of color of  produced yarns .

Second: the relative values and the quality factors:

 The relative values ​​and quality factors of samples with stabilizer against ultraviolet radiation with the following proportions (0.8%, 1%, 1.2%)are accounted to determine the best samples.

Comparing the samples with stabilizer against ultraviolet radiation with different proportions quality factors, it is clarified that :

1) High quality factors for the samples at the speed of (50 rev/minute).

2) High quality factors for the samples at the distance of (5 cm).

      3) High-quality factors for samples at proportion of stabilizer  (1%).

 The relative values ​​and quality factors of samples with Masterbatch with the following proportions (0.4%, 0,6%, 0,8%) are accounted to determine the best samples.

Comparing the quality factors of samples with Masterbatch with different proportions, it is clarified that :

1) High quality factors for the samples at the speed of (40 rev/minute).

2) High quality factors for the samples at the distance of (4cm).

      3) High-quality factors for samples at proportion of stabilizer  (0,4%).

v Quality factors to test of the color intensity of the samples with  masterbatch are accounted  to determine the best samples.

  By comparing the samples quality factors, it is clarified that high-quality samples factors at the percentage (0.6%) as well as the percentage (0.8%)