Influence of Cross-Sectional Shape on the Tensile Properties of Fiber, Yarn, and Fabric

Subject Areas : Spinning, Weaving and Knitting

Mohammad reza Ahmadzadeh ¹ , Ali Asghar Asgharian Jeddi ² , SAEED SHAIKHZADEH NAJAR ³

1 - Islamic azad university Yazd branch
2 - 1 Department of Graduate Studies, Science and Research Branch, Islamic Azad University, Tehran, IRAN.
3 - Department of Textile Engineering

Received: 2023-02-12 Accepted : 2023-08-15 Published : 2025-06-30

Keywords: Fiber, Cross-Sectional, Polyester, Polypropylene, Tensile,

Abstract :

The cross-sectional shape is one of the effective parameters influencing the characteristics of fiber, yarn, and fabric. Today, fibers are produced with different cross-sections to create specific characteristics in fiber, yarn, and fabric. In this study, two fibers were produced: the first is a polyester fiber with two different cross-sections, named trilobal and round; while the second is polypropylene fibers with three different cross-sections, named trilobal hollow, trilobal, and octalobal. The same condition was applied to produce all the fibers. Then, the produced fibers were used to produce yarn and fabric. Fabrics with three weave designs, named plain, satin, and twill, were woven from the produced yarn by completely applying the same conditions. The tensile properties of the fibers, yarns, and fabrics produced were investigated according to available standards in light of elongation and modulus. The statistical analyses of the results showed a significant difference in the characteristics of the fibers, yarns, and fabrics. to create hollow conditions fibers, yarns, and fabrics that were produced were investigated according to available standards in the light of elongation and modulus. The statistical analyses of the results showed the existence of a significant difference in the characteristics of the fibers, yarns, and fabrics as a result of their different cross-sections.

References:


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[9] M. Matsudaira, Y. Kondo, “The Effect of a grooved hollow in a fibre on fabric moisture- and heat-transport properties”, J. Text. Inst.., vol. 87, pp. 409- 16, 1996.
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[11] W. Takarada, H. Ito, T. Kikutani, N. Okui, “Studies on high-speed melt spinning of noncircular cross-section fibers. I. Structural analysis of as-spun fibers, “J. Appl. Polym. Sci., vol. 80, pp. 1575-81, 2001.
[12] T. Nakajima, K. Kajiwara, P. JE McIntyre, Advanced fiber spinning technology: Woodhead Pub Limited; 1994.
[13] TH. Oh, MS. Lee, SY. Kim, HJ. Shim, “Studies on melt-spinning process of hollow fibers”, J. Appl. Polym. Sci., vol. 68, pp. 1209-1217, 1998.
[14] De Rovere, BP. Grady, RL. Shambaugh, “The influence of processing parameters on the properties of melt-spun polypropylene hollow fibers”, J. Appl. Polym. Sci., vol. 83, pp.1759-1772, 2002.
[15] M. Matsudaira, Y. Tan, Y. Kondo, “The effect of fibre cross-sectional shape on fabric mechanical properties and handle”, J. Text. Inst.., vol. 84, pp. 376-86, 1993.
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Full-Text:



Available online at https://sanad.iau.ir/journal/ijtnbm The Iranian Journal of Textile Nano-bio Modification IJTNBM  3 (2023) 31–43

 

 

Influence of Cross-Sectional Shape on the Tensile Properties of

Fiber, Yarn, and Fabric

Mohammad Reza Ahmadzadeha*, Ali Asghar Asgharian Jeddib, Saeed Shaikhzadeh Najarc

 

a,b,cDepartment of Graduate Studies, Islamic Azad University, Science and Research Branch, Islamic Azad University, Tehran, IRAN.

* Corresponding author. E-mail address: [e-mail]

 

 

Received 12 February 2023; revised 13 May 2023; accepted 15 August 2023

Abstract

The cross-sectional shape is one of the effective parameters influencing the characteristics of fiber, yarn, and fabric. Today, fibers are produced with different cross-sections to create specific characteristics in fiber, yarn, and fabric. In this study, two fibers were produced: the first is a polyester fiber with two different cross-sections, named trilobal and round; while the second is polypropylene fibers with three different cross-sections, named trilobal hollow, trilobal, and octalobal. The same condition was applied to produce all the fibers. Then, the produced fibers were used to produce yarn and fabric. Fabrics with three weave designs, named plain, satin, and twill, were woven from the produced yarn by completely applying the same conditions. The tensile properties of the fibers, yarns, and fabrics produced were investigated according to available standards in light of elongation and modulus. The statistical analyses of the results showed a significant difference in the characteristics of the fibers, yarns, and fabrics. to create hollow conditions fibers, yarns, and fabrics that were produced were investigated according to available standards in the light of elongation and modulus. The statistical analyses of the results showed the existence of a significant difference in the characteristics of the fibers, yarns, and fabrics as a result of their different cross-sections.

Keywords: Fiber, Cross-Sectional, Polyester, Polypropylene, Tensile

 

 

 

 

 

1.       Introduction

Synthetic fibers with a round cross-section are the most commonly produced industrially [1]. However, fibers with other cross-sectional shapes are also manufactured for various reasons such as performance, comfort, pilling propensity, bulkiness, tactility, and processing [1-3]. The cross-sectional shape of the fiber significantly influences the physical properties of yarns and fabrics [4, 5]. It can be concluded that fibers with a round cross-sectional shape have the highest tenacity-breaking elongation value and the most even structures, Fiber cross-sectional shapes play a critical role in deciding the surface geometry of fabrics [6]. Characteristics such as bulkiness, crease recovery, flexural rigidity, abrasion resistance, luster, handle, pilling, and dyeing are considered by consumers when making decisions on garment selection [1, 4, 7, 8]. One significant advantage of using fibers with modified cross-sections is their improved flexural stiffness. Fiber cross-section significantly impacts the degrees of fabric softness, drape, crispness, and stiffness [8-10]. In the 1960s, the development of melt-spun fibers began with noncircular cross-sections [2, 11]. in deciding Characteristics that the initial study was on the gloss of expensive silk fiber, a function of altering the cross-section into a trilobal shape, which provided functionality and aesthetics to synthetic fiber by developing different types of non-circular fibers. Fibers with a trilobal cross-section are widely used to produce silk-like fabrics [2, 11, 12]. The cross-section's shape varies by changing the shape of the spinneret hole during the melt-spinning synthetic process. [11, 12]. The properties of fibers with a non-circular cross-section differ from those with a circular cross-section. These properties include bending stiffness, coefficient of friction, softness, luster, comfort, pilling, bulkiness, handle, and performance [1, 9, 13, and 14]. Matsudaria, et al. (1993) evaluated the effect of fiber cross-section on the physical properties of fabric. The impact of eight different cross-sections on the mechanical properties of fabrics (such as tensile strength and shearing strength) was tested. The results revealed that cross-section shape and fiber fineness significantly impact the mechanical properties of fabrics [15].

Alston et al. (2002) studied the effect of polyester fibers with non-circular cross-sections on the rotor spinning of polyester and polyester/cotton yarns [7]. Fibers with hollow, trilobal, oval, ribbon, peanut, and scalloped oval cross-sections were selected. Polyester fibers (i.e., oval, ribbon, peanut, and scalloped oval shapes) with aspect ratios greater than 1 had fewer yarn breaks than the stiffer polyester fibers (i.e., round, hollow, and trilobal shapes) with an aspect ratio of 1. Peanut and scalloped oval fibers, which combined a multi lobular character with an aspect ratio greater than 1, recorded the fewest yarn breaks. The superior rotor spinning of these non-circular fibers was due to the enhanced twist propagation because of the reduced torsional rigidity and lower fiber-to-surface contact. Cross-sections, Karaca and Ozcelik (2006), investigated the effects of fiber cross-sectional shape on the structure and properties of polyester fibers [2]. The result showed that the difference in cross-sectional shapes of fibers influenced modulus, maximum strain, yield stress, and shrinkage in boiling water. They also showed a difference between the strain-stress curves of full and hollow fibers. However, the strain-stress curves of round and trilobal fibers were the same, but the only difference was in the yield stress. Compared to full fibers, hollow fibers recorded a higher yield stress. Dhamija et al. (2011) investigated the effects of polyester fiber fineness and cross-sectional shape on the physical characteristics of yarns. It was observed that all the non-circular fibers had yarn variations higher than the corresponding circular ones. The trend on the yarn packing fraction decreased with the linear density of the constituent fiber. Compared to the circular fibers, the degree of yarn packing in the non-circular fibers was lower [4]. More recently, Babaarsian and Haciogullari reported that round, tetra, and octagonal cross-sectional shapes have resulted in the production of polyester partially oriented yarn (POY) with high tenacity and breaking elongation. However, trilobal and hexes cross-sectional shapes led to yarn production with low tenacity [3]. In addition, due to its deep-channeled structure, the Hexa cross-sectional shape led to a POY structure with a high unevenness rate. It was also shown that an increase in the rate of linear density decreased the tenacity and breaking elongation rates of yarn and reduced POY unevenness. Considering the earlier reviewed literature, it could be concluded that there is no organized and systematic research relating the mechanical properties of fiber with different cross-sectional shapes and yarns to the mechanical properties of fabrics. Therefore, in this study, the researchers systematically investigated the effect of fiber cross-sectional shape on the tensile properties of fibers, yarns, and fabrics. At first, polyester and polypropylene fibers with five different cross-sectional shapes were produced. Then, yarns and fabrics were produced from the obtained fibers using the same condition. The tensile properties (tenacity, elongation, initial modulus) of the fibers, yarns, and fabrics were characterized and studied using statistical analyses. Singh et al., (2021) investigated the effect of fiber cross-sectional shapes on the bending behavior of continuous multifilament polyethylene terephthalate (PET) yarns and corresponding fabrics [16]. Fibers with circular, trilobal, rectangular, plus, double flange dumbly shape, octagonal, hexagonal, square, and trilobal plus or Y-shape cross-sections were selected for the study. The yarn bending behavior was compared with fabric bending behavior to study the effect of cross-sectional shapes on bending behavior.

2.       Experimental apparatus

2.1. Materials and Method

Polypropylene chips (PP 512P, SABIC Co.) a controlled rheology grade with medium molecular weight distribution for fiber extrusion had a melt flow rate of 25 g/10 min (230°C, 2.16 kg) and a density of 0.905 g/cm³ (23°C). Semi-dull polyethylene terephthalate chips (PET-TG641, Tondgooyan Petrochemical Co., Iran) had an intrinsic viscosity of 0.64 dl/g and a titanium dioxide content of 0.3 ± 0.05 wt. %. Square, trilobal plus, and Y-shape cross-sections were selected to compare yarn and fabric bending behavior, examining the effect of cross-sectional shapes on bending.

2.2. Fiber production

The melt-spinning process of NEUMAG is used to produce PP fibers. Three different spinnerets were applied to produce fibers with trilobal, trilobal hallow, and octagonal cross-sectional shapes. To investigate only the effect of the fiber's cross-sectional shape on fiber properties, various processing parameters such as viscosity, mass throughput rate, spinning temperature, take-up speed, and quenching conditions that affect the final properties of melt-spun fibers were kept constant. This approach meant that the polymer's throughput and take-up speed were constant for each sample. The spinning speed was set at 3000 m/min. The melt spinning of the Pacific was used to produce the PET fiber. All the included parameters were kept constant, except for the cross-sectional factor of the fiber. Two different spinnerets were applied to produce fibers with round and trilobal cross-sectional shapes. Here, as in the case of the PP fibers, all the spinning parameters were kept constant, except for the cross-sectional shapes of the spinnerets. The spinning speed was set at 2200 m/min. The fiber area and perimeter were measured using an image processing technique. These quantities were measured for five different filaments in the bundle and the average was obtained. These values were used to calculate the "non-roundness" factor k defined as follows (Table 1.):

                                          (1)

where k is the non-roundness factor (dimensionless); Cf is the fiber circumference (m); and S is the fiber cross- sectional area (m²) [1].

2.3. Yarn production

The produced PP yarns consisted of a full-drawn yarn (FDY) of 136 filaments with a linear density of 1690 dtex. PET yarns consisted of 384 filaments with a linear density of 1800 dtex.

Table 1. Shape Factor of Fibres

Fibre	Cross Section	K
Polyester	T	1.174
	R	1.0628
PP	Oc	1.36
	TH	1.38
	T	1.326

T: Trilobal, TH: Trilobal Hallow, Oc: Octalobal, R: Round

2.4. Fabric production

Five different fabrics were woven in three different weaving patterns (plain, 2/1 Z twill, and satin) using the Sulzer G6300 weaving loom under the same conditions. Warp yarns of polyester and five types of weft yarns were applied to produce the fabrics. Table II shows the characteristics of the fabrics obtained under ASTM D3776 and ASTM D1777 standards.

Table 2. Characteristics of The Fabrics

			Ends/cm	Picks/cm	Thickness mm	Weight gr/cm2
Polyester	Plain	T	14.4	9.2	0.746	0.0291
		R	14.4	9.2	0.708	0.0322
	Twill	T	14.4	9.2	0.658	0.0286
		R	14.4	9.2	0.622	0.0312
	Satin	T	14.4	8.8	0.830	0.0266
		R	14.4	8.8	0.790	0.0318
PP	Plain	Oc	15.5	9	0.788	0.0222
		TH	15.5	9	0.862	0.0193
		T	15.5	9	0.784	0.0221
	Twill	Oc	16	9.3	1.014	0.0227
		TH	16	9.3	1.1	0.0238
		T	16	9.3	1.04	0.0258
	Satin	Oc	16	9.5	0.654	0.0213
		TH	16	9.5	0.744	0.0217
		T	16	9.5	0.760	0.0237

2.5. Characterization

Optical microscopy (Lelica Metallovert) was used to determine the area diameter of the filaments. To perform these tests, the filaments were embedded in epoxy resin matrix, followed by curing at ambient temperature. The specimens were polished perpendicularly to the fiber axis.

After being cleaned in water and dried, the polished samples were analyzed using an optical microscope.

The single fiber tenacity measurement was conducted for at least 30 single fibers using a force transducer instrument, Sdl Atlas, equipped with a 100 cN force cell. With ASTM D 3822, the cross-head velocity was 1010 mm/min while the gauge length was 20 mm. The linear density of the yarns was measured according to ASTM D 1907. For mean and standard deviation determination, five measurements were made.

Yarn tensile tests were carried out according to ASTM D 2256 using a Mesdan Lab tensile tester with an accuracy of about 0.01 N. Samples with 250 mm yarn length were used. The testing speed was set at 200 mm/min. The tensile force versus deformation was recorded, and 30 measurements were made to get the force average value for each type of yam. Breaking force is a measure of the steady force that is necessary for the breaking of a fiber and is experimentally given by the maximum load developed in a tensile test.

With the standard test method of ASTM D 5034, the tensile strength and elongation of the fabrics were evaluated using a Mesdan Lab instrument. A constant cross-head speed of 50 mm/min was used throughout the experiments. The measurements were performed in the warp and weft directions of the fabrics (20 × 5 cm), and the average values were determined from the measurements of five samples. Thereafter, the experimental results were statistically analyzed by the SPSS software using ANOVA, T-test, and Duncan methods.

 

3. Results and Discussion

3.1. Fabric Characterization

Figures 1 and 2 show the respective microscopy photographs of the obtained PP and PET filaments. The PP and PET filaments with different cross-sectional shapes were successfully produced and used for the making of yarns and fabrics.

 

 

 

 

 

 

 

 

 

 

Figure 1. Microscopy photographs of the produced PP filaments: (a) Octalobal, (b) Trilobal and (c) Trilobal hollow

 

 

Figure 2. Microscopy photographs of the produced PET filaments: (a) round and (b) trilobal.

 

Table 3. Statistical Results of Tensile Properties of the Fibers

Sig	T	Std.D	Mean	N
0.00	-5.894	1.304	27.827	30	Trilobal	Tenacity (cN/Tex)	polyester
		1.732	31.39	30	Round
0.00	-6.632	5.053	41.325	30	Trilobal	Elongation (%)
		7.336	55.136	30	Round
0.088	2.004	0.627	41.325	30	Trilobal	Modulus (N/Tex)
		0.201	55.136	30	Round
Sig	F
0.038	3.373	2.156	37.050 a	30	Octalobal	Tenacity (cN/Tex)	PP
		1.898	39.627b	30	Trilobal Hallow
		3.125	38.553b	30	Trilobal
0.925	0.079	15.542	48.853	30	Octalobal	Elongation (%)
		16.963	48.041	30	Trilobal Hallow
		15.552	47.302	30	Trilobal
0.122	2.155	0.113	1.828	30	Octalobal	Modulus (N/Tex)
		0.127	1.918	30	Trilobal Hallow
		0.142	1.828	30	Trilobal

a, b, c means differences between the values and indicate meaningful variations in this case.

 

Table 3. presents the average tensile properties of the fibers. Polyester fibers exhibited a significant variation in tenacity and elongation, with round cross-sections displaying superior tenacity and elongation. Among PP fibers, tenacity varied significantly, with trilobal hollow fibers demonstrating the highest tenacity. Notably, tenacity did not differ significantly between trilobal hollow and trilobal PP fibers. Elongation showed no statistically significant difference across all PP fibers. Initial modulus was calculated from the slope of the linear portion of the stress-strain curve.

3.2. Properties of yarns

Table 4 shows the statistical results of the tensile properties of PP and PET yarns. In the case of PET yarns, the results showed a meaningful difference between the tenacity and elongation of yarns. Yarns with a round cross-sectional shape had the highest tenacity values. In the case of PP yarns, the results showed that there was a significant difference between tenacity and elongation values. Yarns with an Octalobal cross-sectional shape had the highest tenacity; however, there was no significant difference between the tenacity values of trilobal and trilobal hollow cross-sectional shapes. For all the PP fibers, the elongation values had no statistically significant difference. The initial modulus was determined by the slope of the initial part of the stress-strain curve, which means the tangent of the linear part of the curve, as shown in Figure 3.

 

Table 4. Statistical Result of Tensile Properties of the Yarns

Sig	T	Std. D	Mean	N
0.00	-14.192	1.07	25.887	30	Trilobal	Tenacity (cN/Tex)		polyester
		0.968	29.635	30	Round
0.00	8.736	3.144	42.989	30	Trilobal	Elongation (%)
		2.762	36.294	30	Round
0.088	1.80	1.720	1.159	30	Trilobal		Modoulus (N/Tex)
		2.370	.874	30	Round
Sig	F
0.00	14.084	0.379	26.503b	30	Octalobal	Tenacity (cN/Tex)		PP
		0.525	25.708a	30	Trilobal Hallow
		0.821	25.417a	30	Trilobal
0.00	9.555	3.782	39.927b	30	Octalobal	Elongation (%)
		2.395	36.428a	30	Trilobal Hallow
		2.675	40.491c	30	Trilobal
0.122	2.155	0.916	1.219	30	Octalobal	Modoulus (N/Tex)
		0.930	1.279	30	Trilobal Hallow
		0.860	1.219	30	Trilobal

a, b, c means differences between the values and indicates meaningful variations in this case.

 

 

 

 

 

 

 

 

 

 

 

                                Figure 3. Stress-strain curve

3.3. Properties of PET fabrics

The results of the strength, elongation, tenacity, and initial modulus of the PET fabrics in both the warp and weft directions, and also for three weaving patterns, were statistically investigated and are shown in Tables 5 and 6. The results showed that in warp and weft directions, the different cross-sectional shapes influenced all parameters of the fabrics. In all the weavings, except twill, strength variations are meaningful in the direction of warp, but elongation variations are meaningful in all the weavings. In the direction of weft, elongation is meaningful only in satin weaving. The variation in initial modulus in both warp and weft directions is meaningful, but in the weft direction, it is only meaningful for satin.

 

3.4. Properties of PP fabrics

Tables 7 and 8 show the results of the tensile properties of PP fabrics in both the warp and weft directions, and also for the three weaving patterns. In all the weavings except twill, strength variations are meaningful in the direction of warp, but elongation variations are meaningful in all the weavings in warp direction. In the weft direction, elongation is meaningful in satin weaving. Variations in the initial modulus in both the warp and weft directions are meaningful. Cross-sectional shape does not have a meaningful impact on the fibers and yarns, but has a meaningful effect on the fabrics. Hence, it could be concluded that the weaving structure has a more important effect on the initial modulus.

 

Table 5. Statistical Results of Tensile Properties of Pet Fabric in the Warp Direction

 

		Cross section	N	Mean	Std.D	T	Sig
Plain	Strength (N)	T	5	596.705	7.223	11.227	<0.001
		R	5	517.429	14.039
	Elongation (%)	T	5	27.200	0.844	-3.22	0.012
		R	5	28.785	0.704
	Initial modulus (N/Tex)	T	5	2.960	0.406	6.894	<0.001
		R	5	1.799	2.058
Twill	Strength (N)	T	5	524.992	31.593	-1.763	0.116
		R	5	555.406	22.121
	Elongation (%)	T	5	22.600	0.224	12.016	<0.001
		R	5	18.600	0.709
	Initial modulus (N/Tex)	T	5	2.524	-2.174	1.742	0.061
		R	5	3.272	0.612
Satin	Strength (N)	T	5	643.810	31.046	5.775	<0.001
		R	5	529.668	31.450
	Elongation (%)	T	5	20.900	1.714	-5.43	0.001
		R	5	25.432	0.737
	Initial modulus (N/Tex)	T	5	5.702	3.063	1.991	0.082
		R	5	2.963	0.290

 

Table 6. Statistical Results of Tensile Properties of Pet Fabric in the Weft Direction

Sig	T		Std.D				Mean		N	Cross section
0.000	-8.431		40.360547				1620.93260		5	Trilobal			Strength (N)			plain
			19.779474				1790.40380		5	Round
0.001	12.14		1.950955				43.66850		5	Trilobal			Elongation (%)
			1.380142				30.69290		5	Round
0.000	-7.344		4.6532970				31.226400		5	Trilobal			Initial modulus (N/Tex)
			4.4131048				52.290200		5	Round
0.002	-4.400		55.841774				1548.10640		5	Trilobal			Strength (N)			Twill
			28.538201				1671.50740		5	Round
0.001	5.335		2.187716				37.36760		5	Trilobal			Elongation (%)
			2.467091				29.50020		5	Round
0.349	0955		4.2787869				48.031600		5	Trilobal			Initial modulus (N/Tex)
			3.7156758				45.510600		5	Round
0.000		13.421		41.834080				1824.33320			5		Trilobal		Strength (N)	Satin
				33.412410				1502.98100			5		Round
0.859		0.184		3.470270				29.32860			5		Trilobal		Elongation (%)
				4.161712				29.77370			5		Round
0.000		43.61		2.5444453				65.845300			5		Trilobal		Initial modulus (N/Tex)
				.8365828				19.985200			5		Round

a,b,c means differences between the values and indicates meaningful variations in this case.

 

Table 7. Statistical Results of Tensile Properties of Polypropylene Fabric in the Warp Direction

‌Sig	F	Std. D.	Mean	N	Cross section
.007	7.809	21.355	5.427 b	5	Octalobal	Strength (N)	Plain
		18.149	5 a	5	Trilobal Hallow
		8.214	5.18 a,b	5	Trilobal
.000	40.50	0.833	36.67 c	5	Octalobal	Elongation (%)
		1.981	28.38 a	5	Trilobal Hallow
		1.335	33.01 b	5	Trilobal
00	48.74	0.137	1.11 a	5	Octalobal	Initial modulus (N/Tex)
		0.512	3.18 b	5	Trilobal Hallow
		0.222	1.72 a	5	Trilobal
.053	3.78	64.631	5	5	Octalobal	Strength (N)	twill
		34.899	5	5	Trilobal Hallow
		18.209	5.6	5	Trilobal
.004	8.94	3.189	21.39 a	5	Octalobal	Elongation (%)
		1.473	26.71 b	5	Trilobal Hallow
		1.119	25.81 b	5	Trilobal
.013	6.398	0.906	4.05 b	5	Octalobal	Initial modulus (N/Tex)
		0.172	3.18 a,b	5	Trilobal Hallow
		0.296	2.81 a	5	Trilobal
.002	10.61	19.562	5.7 b	5	Octalobal	Strength (N)	satin
		31.450	5.3 a	5	Trilobal Hallow
		18.633	5.9 b	5	Trilobal
.011	6.777	1.140	22.903 a	5	Octalobal	Elongation (%)
		0.737	25.432 b	5	Trilobal Hallow
		1.737	22.828 a	5	Trilobal
.000	44.96	0.830	6.303 b	5	Octalobal	Initial modulus (N/Tex)
		0.290	2.963 a	5	Trilobal Hallow
		0.724	2.813 a	5	Trilobal

 

Table 8. Statistical Results of Tensile Properties of Polypropylene Fabric in The Weft Direction

‌Sig		F		Std.D		Mean		N							pp * weft
.000		556.349		19.603		43 c		5		Octalobal		Strength (N)			Plain
				40.966		27 a		5		Trilobal Hallow
				18.814		32 b		5		Trilobal
.080		3.149		1.785		28.871		5		Octalobal		Elongation (%)
				1.416		26.669		5		Trilobal Hallow
				1.712		28.987		5		Trilobal
.000		124.419		1.725		25.614 b		5		Octalobal		Initial modulus (N/Tex)
				1.427		19.674 a		5		Trilobal Hallow
				0.523		32.899 c		5		Trilobal
.000		71.583		38.000		43 c		5		Octalobal		Strength (N)			twill
				62.948		39 b		5		Trilobal Hallow
				65.527		31a		5		Trilobal
.000		19.337		2.238		31.447 c		5		Octalobal		Elongation (%)
				1.914		28.291 b		5		Trilobal Hallow
				0.989		24.403 a		5		Trilobal
.000		17.913		3.543		24.230 b		5		Octalobal		Initial modulus (N/Tex)
				1.617		23.746 b		5		Trilobal Hallow
				1.053		16.362 a		5		Trilobal
.000		34.209		77.477		36 b		5		Octalobal		Strength (N)			satin
				41.237		40 c		5		Trilobal Hallow
				46.439		31 a		5		Trilobal
.098		2.844		3.071		27.338		5		Octalobal		Elongation (%)
				4.161		29.773		5		Trilobal Hallow
				1.268		25.137		5		Trilobal
.000		145.572		1.122		11.283 a		5		Octalobal		Initial modulus (N/Tex)
				0.836		19.985 c		5		Trilobal Hallow
				0.414		13.074 b		5		Trilobal

a,b,c means differences between the values and indicates meaningful variations in this case.

 

The results of the present study are in full agreement with the results of other works [1,5] that investigated the effects of different cross-sectional shapes (i.e., round, trilobal, tetra, hexsa, and octalobal) on the tensile properties of the polyester fibers and showed that the tensile strength of fibers with round cross-sectional shape was higher than those with other cross-sectional shapes, regardless of the fiber density.

 

4. Conclusions

The cross-sectional shapes of the filaments were shown to have a substantial influence on the properties of fibers, yarns, and fabrics. For both PP and PET, and by varying the cross-sectional shapes of the filaments, significant differences were observed among the values of tenacity, elongation, and modulus of the products.

There were significant differences in the tenacity and elongation of polyester fibers, but there was no difference in their initial modulus. The tenacity and elongation in fibers with a round cross section were higher than those of trilobal fibers. However, there was only a significant difference in the tenacity of polypropylene fibers, while fibers with a trilobal hollow cross-section had the highest level of tenacity.

There were significant differences in the tenacity and elongation of PET and PP yarns, while the initial modulus did not change. PET yarns containing fibers with round cross-section had the highest tenacity, and yarns containing fibers with trilobal cross-section had the highest elongation. PP yarns containing fibers with Octalobal cross section had the highest tenacity, while yarns with trilobal cross section had the highest elongation.

In all the weavings of PET fabrics, except for twill, strength variations were significant in the warp direction, whereas elongation variations were significant in all weavings. In the weft direction, elongation was only significant in satin weaving. Both the warp and weft directions showed meaningful variation in the initial modulus, but in the weft direction, it was only significant for satin.

In all the weavings in PP fabrics, except twill, strength variations were meaningful in the warp direction, but elongation variations were meaningful in all the weavings in the warp direction. In the weft direction, elongation was meaningful in satin weaving. In both warp and weft directions, variation in initial modulus was meaningful. Cross-sectional shape did not have a meaningful effect on the fibers and yarns, but there was a meaningful effect on the fabrics. Hence, it could be concluded that the weaving structure had a more important effect on the initial modulus.

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*Corresponding author. Department of Graduate Studies, Islamic Azad University, Science and Research Branch, Islamic Azad University, Tehran, IRAN

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