Front Roller Research Articles

Tuning drafting zone parameters for polyester yarn within a ring spinning system: modeling and optimization

Yarn is a fundamental element in most textile products. Among various yarn manufacturing methods, the ring spinning system is particularly important due to its benefits, such as high yarn quality, evenness, low hairiness, and ease of handling. The parameters of the drafting zone in this system greatly impact yarn quality. Typically, adjusting these parameters in the drafting zone is time-consuming and costly using trial-and-error method. This study introduces an algorithmic approach using response surface methodology (RSM), experimental modeling, and multi-objective optimization to decrease unevenness percentage (U%) and imperfection index (IPI). Input parameters optimized include cots hardness of front and back top rollers, spacer size, and break draft. Results showed that the artificial neural network (ANN) predicts response parameters superiorly with determination coefficient close to 1, compared to RSM, which has a determination coefficient of about 0.72. Therefore, ANN was chosen for optimization. Additionally, combining the genetic algorithm (GA) with two ANN-based models reduced IPI from 39 to 33.67 and a decreased from 9.73% to 9.67% occurred in terms of U%. The final Input settings were the cots hardness of the front roller of 70 shores and the cots hardness of the back roller of 76 shores, spacer size 2.8 mm, and break draft of 1.26. This method efficiently optimizes the drafting zone parameter, thus enhancing yarn quality.

Upaya Meningkatkan Kemampuan Senam Lantai Guling Depan Dengan Menggunakan Metode Pendekatan Jigsaw Pada Siswa Kelas IX C SMP Negeri 22 Semarang Tahun Pelajaran 2023/2024

This research was conducted to overcome the unmet criteria for completeness in learning front-rolling gymnastics in class IX C SMP N 22 Semarang. This research aimed to improve the learning of front rolling through the Jigsaw approach in class IX C SMP N 22 Semarang. This research is a classroom action research consisting of two cycles, each consisting of two meetings. The research subjects were 33 students of class IX C SMP N 22 Semarang (14 boys and 19 girls). The data collection instruments used include observation, questionnaire, and front roll learning outcomes test. Data analysis techniques were carried out qualitatively and quantitatively. The results showed that the Jigsaw approach can improve front-roll learning in class IX C SMP N 22 Semarang students. Based on the analysis conducted by collaborators and researchers, the value in Cycle I was 54% and in Cycle II reached 100%, so it can be concluded that learning floor exercises through the Jigsaw approach has increased in class IX C SMP N 22 Semarang.

The influence of the friction field on accelerating position distribution

In accordance with the tenets of displacement deviation theory, the distribution of accelerating positions was the main reason for the uneven output sliver. To elucidate this phenomenon, a dynamic drafting model with controllable fiber proportion was developed in this paper to simulate the accelerating process of the floating fiber. The model was employed to investigate the impact of the friction field on the distribution of accelerating positions, achieved through the manipulation of friction field distribution and fiber proportion in the drafting zone. The simulation results indicated that, with various drafting conditions, the friction field at the position with a higher slow fiber proportion always made the accelerating position distribution closer to the front roller. In addition, the duration of the friction field influence on the fiber floating process was found to be directly proportional to its effect on the accelerating position distribution. Furthermore, there was a critical slow fiber proportion, which increased in tandem with the augmentation of slow fiber proportions in the drafting zone. The friction field at the position where the proportion of slow fibers was higher than the critical slow fiber proportion made the accelerating position distribution closer to the front roller; otherwise, the friction field made the accelerating position distribution closer to the back roller. This study can offer a valuable reference for designing more effective friction field distribution to improve the output sliver quality.

Analysis of Front Roll Movement In Gymnastics: An Inquiry Approach Among Physical Education Students

This study describes the analysis of front roll movement skills in students using an inquiry approach, emphasizing active exploration and investigation by students. The research method utilized was quantitative descriptive. The research sample consisted of 63 physical education students from IKIP PGRI Pontianak. The research results indicate that students' activity in performing front roll movements in gymnastics with the inquiry method showed improvement. Initial data showed that for Morning Class A, 19 students, or 63.3% out of 30 students, obtained a Poor Category; for Afternoon Class, 24 students, or 80% out of 30 students, obtained a Poor Category. After implementing the inquiry method, there was an improvement in Morning Class students, with 24 students, or 80% out of 30 students achieving a Medium Category, and in Afternoon Class A, 28 students, or 93.3% out of 30 students achieving a Medium Category. This study concludes that using the inquiry method can enhance the skills of physical education students in performing front roll movements in gymnastics

Application of Dominant Movement Patterns in Front Roll Learning

Application of Dominant Movement Patterns in Front Roll Learning

Application of the PBL (Problem-Based Learning) Learning Model in Improving Front Roll Floor Gymnastics Ability at Class VII of SMPN 3 Gerung for the 2023-2024 academic year

The PBL Learning Model is a learning approach that is student-centered and focuses on problem solving. In the context of floor exercise abilities, especially the front roll sub-material. The approach used to improve front roll ability is Problem Based Learning (PBL). By using this approach, students are expected to be able to learn independently to find out good techniques through collaboration between their respective groups. So, from the overall process in this research, the total knowledge results were 2,060, the average knowledge was 79.2, the number of students who completed the study was 26, the percentage of students who completed was 100%, and the percentage of incomplete students was 0%. So, from the recapitulation data, the overall problem-based learning model for floor exercise on roll material has improved with the approach applied by teachers to students at SMPN 3 Gerung for the 2023-2024 academic year.

Improving Learning Outcomes Of Front Roll On Floor Gymnastics Through A Game Model In Class IV Students Of Primary School Negeri 70 Lubuklinggau

This study aims to determine the role of the game model in improving the learning outcomes of fourth grade students of SD Negeri 70 Lubuklinggau by analyzing data on learning outcomes obtained from learning in cycle I and cycle II. This research is a classroom action research conducted collaboratively and participatively with peers. The research subjects were fourth grade students of SD Negeri 70 Lubuklinggau in the odd semester of the 2023/2024 academic year, totaling 27 students. The results showed that the teaching and learning process of forward rolling improved from cycle I and cycle II, as evidenced from cycle I the average student activity reached 48.75% with sufficient criteria, cycle II reached 72.5% with good criteria. Cycle I teacher skills reached 57.5% with sufficient criteria, cycle II 73.75% with good criteria. Based on data analysis, it can be concluded that learning front roll floor exercises through a game model can improve student learning outcomes. Initial data obtained from cycle I class average of 66.66% or a total of 18 students who meet the KKM standard of 70, while 9 students or 33.33% have not met the KKM. The average score at the end of cycle II increased to 24 or 88.88% who met the KKM and 3 students or 11.11% below the KKM.

Pengaruh Media Video Pembelajaran untuk Meningkatkan Penerapan Prosedur Pada Materi Sub Tema Pola Gerak Dominan Senam di Kelas 5 SD

The purpose of this study was to determine the increase in the application of student procedures after the use of learning video media on the sub-theme of the dominant movement pattern of grade 5 elementary school gymnastics. This study used a quantitative approach. The data used is taken from the value of the results of the front roll practice. The number of samples in this study was 25 grade 5 elementary school students. Data analysis technique using paired sample test. The results showed that there was a significant influence on the application of procedures after the use of learning video media.

Prediction of the Impact of Ring Spinning Machine Front Roller Rubber Cot Shore Hardness on Spun Yarn Quality Parameters

The yarn quality is mostly determined by the spinning settings, process control methods, and raw material. The most crucial and fundamental process in ring spinning is drafting, which has a significant impact on the quality of the yarn. Yarn quality is greatly impacted by drafting elements such as shore hardness. This study aimed to predict the effect of different degrees of shore hardness in the ring machine front roller rubber cot on 100% cotton and 32s Ne ring spun yarn quality parameters. The backline shore hardness was constant. Cotton yarn properties, including mass uniformity, imperfection level, unevenness, hairiness, tensile strength, and elongation, were measured and analyzed in accordance with ASTM D1425-96 and ASTM D2256, 2015 test standards, respectively. Linear regression equations were developed for prediction. A linear regression analysis showed that there is a positive correlation between shore hardness and yarn quality parameters with higher R2 values. Therefore, almost in all cases, the value of R2 was above 0.834, which signifies one can make a definite prediction about the yarn properties with different shore hardness. From the result of this study, it can be concluded that the quality of the produced yarn is superior to about 63-65° shore hardness values.

Development of augmented reality to facilitate floor exercise movement skills for junior high school students

Augmented reality is part of technological developments to help make interactions and learning activities more enjoyable. This research aims to develop augment reality technology to facilitate floor exercises for junior high school students. The final product in this research is an augment reality application that can be installed on a smartphone. This research and development method is adopted from Borg and Gall which is divided into 7 stages, namely the research and data collection stage, planning stage, initial product development stage, initial field trial stage, test results revision stage, field trial stage and product refinement stage , while for data collection using non-test methods (interviews, observation and documentation), and test methods. The subjects in this research involved media experts, gymnastics learning experts, and students of junior high school 1 Karangploso. The results of research on test subjects show that augmented reality floor exercise media can be implemented well with media material validation results getting an average result with a score of 88.75%, media validation getting an average result with a score of 89.75%, expert test users getting the average result was 90%, and the trial results obtained an average of 90.2%. So it can be concluded that AR (Augment Reality) technology media is suitable for use as a floor exercise lesson for Junior High School 1 Karangploso.Keyword: augment reality, floor exercise, front roll, back roll

PENGARUH PENGGUNAAN MATRAS BIDANG MIRING TERHADAP PENINGKATAN KEMAMPUAN GULING DEPAN PADA MATA PELAJARAN PJOK DI SDN 2 NGLURUP PONOROGO

This study aims to evaluate the improvement of the ability and learning outcomes of the front roll through the application of a modification of the inclined plane mattress tool to students of SDN 2 Nglurup, Sampung District, Ponorogo District. The research was conducted using the Classroom Action Research (PTK) method and involved students in learning floor gymnastics. The results showed that the application of tool modifications for two cycles succeeded in improving students' abilities and learning outcomes in front roll movements. In cycle I, the level of the learning completeness only reached 37.5%, but after the tool modification approach in cycle II, the level of learning completeness increased to 87.5%. Thus, it can be concluded that the application of the modification of the inclined plane mattress tool in PJOK learning can improve the ability and learning outcomes of front roll in students of SDN 2 Nglurup, Sampung District, Ponorogo District.

A novel model for predicting tenacity and unevenness of ring-spun yarn: a special case in textile engineering

This study aimed to model the unevenness and tenacity of ring-spun yarn in a special case in textile engineering using response surface methodology. Yarn number and front roll speed were input variables, while yarn tenacity and unevenness were response/output variables. This study showed that the response surface methodology (RSM) could predict the yarn’s tenacity and unevenness with the yarn coefficient of determination (R2) values of 0.99 and 0.98 and with the error sum of square (SS residual) values 0.00187 and 0.003215, respectively. We also found that an artificial neural network (ANN) could predict the yarn's tenacity and unevenness with the yarn coefficient of determination (R2) values of 0.51 and 0.63 and with the error sum of square (SS residual) values 1.48 and 0.856, respectively. It was concluded that the response surface methodology (RSM) and artificial neural network (ANN) could predict the yarn's tenacity and unevenness. Response surface methodology (RSM) predicts yarn characteristics better than ANN with MIMO (multiple inputs, multiple outputs) modeling. The novelty of this study is that we used RSM and ANN for the first time to obtain the tenacity and unevenness of ring-spun yarn accurately. A simpler approach was employed in this study for predicting tenacity and unevenness using RSM and ANN; however, future research holds the potential for incorporating advanced mathematical models to enhance the prediction. This research suggests that RSM and ANN can be applied to predicting the tenacity and unevenness of ring-spun yarn. The scientific application of this research is that the investigation will benefit practitioners in the textile industry to optimize yarn parameters by ring spinning machines.

Anxiety Factors in Doing Floor Gymnastics (Front Roll) for Class V Students Muhammadiyah 18 Palembang Elementary School

This study aims to determine the anxiety factor in doing floor exercise (front roll) for fifth grade students at SD Muhammadiyah 18 Palembang. The focus of this study was to evaluate the student’s anxiety factor in doing the front roll floor gymnastics who still experience a lot of doubts, or excessive anxiety in doing the front roll movement. This study uses the CIPP model which includes three indicators as follows: context, input, process, product. The interviews included fifth grade students at Muhammadiyah Elementary School and two sports teachers. Direct observation of the school and the infrastructure used by these students. This research was the cause of failure due to students’ anxiety in doing the floor gymnastics practice and there were also those who did not want to participate at all. So that it results in a student learning system that is not as expected. The results of context research are 59% input 40% process 40% product 48%.

Persepsi Siswa Kelas XI IPA 3 Dan XI IPS 2 terhadap Pembelajaran Senam Lantai Materi Roll Depan di SMANegeri 9 Samarinda Tahun Pembelajaran 2017/2018

The purpose of this study was to find out how big the perception of class XI IPA 3 and XI IPS 2 SMA Negeri 9 Samarinda students towards the front roll material floor gymnastics learning. The subjects in this study were students of class XI IPA 3 and XI IPS 2 with 70 students of which 40 were male and 30 female. The method used in this research is descriptive quantitative using a questionnaire instrument. Data analysis was carried out using the percentage formula. The data obtained is data in the form of numbers calculated, then processed by adding up, compared with the number of respondents and the percentage obtained. The results showed that the description of the perceptions of students in class XI IPA 3 and XI IPS 2 towards learning floor exercise on the front roll material, the perception of factors / experiences in the very good category, as many as 67 respondents (95.71%) and as many as 3 respondents (4.29%) in the category good. Perceptions of student needs in the very good category as many as 57 respondents (81.43%) of which 11 respondents (15.71%) were in the good category, 1 respondent (1.43%) was in the fairly good category and 1 respondent ( 1.43%) is in the less category. Perceptions of fun/hobby factors in very good category 27 respondents (38.57%) 23 respondents (32.86%) were in good category, 16 respondents (22.85%) were in, 3 respondents (4.29%) ) is in the poor category and 1 respondent (1.43%) is in the very poor category. Perceptions of habits / patterns of daily living are in very good category as many as 38 respondents (54.28%) 23 respondents (32.86%) are in good category and 9 respondents (12.86%) are in quite good category .

Research on a novel sheath core-wrap staple yarn based on the ring spinning frame with special-shaped roller

This work explored a novel method for producing sheath core-wrap staple yarn on a modified ring spinning machine. The sheath core-wrap staple yarn is a new composite yarn whose core layer and sheath layer are both composed of staple fibers. In this paper, the conventional front roller on the ring spinning machine was replaced by a special-shaped roller, named a coaxial front roller of different diameters. In the spinning process, two colored cotton rovings were fed into the back roller. Then they are conveyed to the coaxial front roller of different diameters and output at different speeds. Finally, they were spun in a sheath core-wrap staple yarn under the twist effect. The covering effect and properties of sheath core-wrap staple yarn are the critical concerns in this article. Mathematical equations have been derived to calculate the ideal twist multiplier. It is most favorable for the core fiber to be covered at the ideal twist multiplier 408. The effects of the twist multiplier and core proportion on core exposure ratio and yarn properties (tensile properties, abrasion resistance, evenness, and hairiness) were investigated. The results showed that the core exposure ratio of all sheath core-wrap staple yarns were less than 2%, and the minimum core exposure ratio was obtained at the twist multiplier 400. The results also demonstrated that the tensile property, abrasion resistance, evenness, and hairiness improved with the increase of the twist multiplier and the core proportion. The proposed method provides new insight for researchers to fully understand the production process of sheath core-warp staple yarn and improve the yarn quality.

A dynamic drafting model with the frictional force between fibers

Roller drafting is one of the most critical processes in spinning. This study established a dynamic drafting model and simulated the drafting process affected by the frictional force between fibers. In the simulation, the dynamic drafting process of fibers was simulated by calculating the movement time of fibers in the drafting zone. Moreover, the dynamic accelerating process of fibers was simulated by calculating the frictional force between fibers during the dynamic drafting process. Therefore, this model could simulate the dynamic drafting process affected by the frictional force between fibers. The proposed model was validated by the comparison with the experimental data of accelerated point distribution and output sliver irregularity. In addition, the distribution of accelerated points and fibers with various drafting ratios was simulated. The simulated results indicated that the greater the draft ratio, the more the slow fibers and the fewer the fast fibers in the drafting zone. Furthermore, the accelerated point distribution was more concentrated and closer to the front roller nip line. Thus, this model can offer a valuable reference to investigate the principle of influence of drafting conditions on the drafting process.

Effect of Front Roll Hoop Chassis Length of FSAE Car on Stress Analysis and Deflection

Effect of Front Roll Hoop Chassis Length of FSAE Car on Stress Analysis and Deflection

The Effect of Using Learning Methods on Learning Outcomes Front Roll Viewed from the Flexibility Factor in Class X Students of SMK Negeri Kademangan, 2021

The background of this research is the lack of teacher methods in giving instructions or lessons on floor gymnastics, especially the front roll. Many students experience difficulties and injuries when doing the front roll practice. Therefore we need a type of method that can be used to anticipate these problems. One method that can be used is to use video in the learning process of floor gymnastics. In addition, the level of flexibility of students also has an influence on success in doing the front roll. This study will discuss the effect of using the video method in learning floor gymnastics. The problems of this research are (1) Can learning methods and flexibility factors affect the results of the front roll of floor exercise in class X SMKN 1 Kademangan? (2) How big is the influence of learning methods and flexibility factors on the front roll of floor gymnastics in class X SMKN 1 Kademangan? (3) Which is the better learning outcome through the demonstration method or the video method in learning the front roll of floor exercise? The type of research used is experimental research. The subjects used were students of class X TKJ SMKN Kademangan. The research subjects will be divided into two class groups, namely groups that use video media and groups that use demonstration methods. Both groups will be given a pretest to determine the initial ability. Furthermore, all subjects will be measured the level of flexibility. Flexibility will be divided into two, namely high flexibility and low flexibility. Determination of the level of flexibility of students based on the flexibility test. The analytical technique used for data analysis is one-way ANOVA, independent sample t test and linear regression. The test results for the two groups found that there was an influence given by the learning method and the flexibility factor on the students' front roll results. The results of calculations using ANOVA found a significance value of 0.008. This value is smaller than 0.05 so it can be concluded that there is a significant effect of the use of learning methods and the level of student flexibility. Furthermore, based on regression analysis, it was found that the method used and the level of flexibility had an effect of 13.4% on the students' front roll results. Subsequent testing using the Independent sample t test found that the video method was better than the demonstration method. The video method can significantly increase by 3.8 of students' front roll results. The conclusion in this study is that the use of the video method is better if it is used to improve students' front roll results. Keywords: learning method, flexibility, front roll, floor exercise.

The Effectiveness of Jigsaw Type Cooperative Learning on the Ability of Front Roll Floor Gymnastics for Grade VIII Students of Hesti Wira Cakti Junior High School

This study aims to produce effective classroom learning through gymnastics learning skills. This research is a Classroom Action Research (CAR). Classroom action research is research that has the aim of carrying out a certain action in order to improve or improve the practice of learning activities in the classroom so that it becomes a professional learning activity. CAR is one of the efforts that teachers can do to improve the quality of teacher roles and responsibilities, especially in learning management. Through CAR, teachers can improve their performance continuously, by self-reflection. the results of research that has been carried out by researchers with physical education subject teachers for class VIII SMP Hesti Wira Cakti Pandaan obtained from interviews, observations, non-tests, and is supported by existing data.

Development of front and back rolling mobile learning media for class x students of SMAN 1 Pamekasan

Many students do not understand the gymnastic movements being taught and become bored with the movement, as well as the learning method. This study aims to produce a learning media device in physical education, sports and health in the form of mobile learning floor exercise with front roll and back roll material for student’s class X of SMAN 1 Pamekasan so that it can be a teaching material. In this study, the Research and Development (R&D) from Lee and Owens was. So that only 5 steps are in accordance with the conditions in the field. (1) needs analysis, (2) product design, (3) development related to the material to be developed (4) application/implementation, (5) product evaluation by experts and product trials. Results of product development data obtained the first result (91.3%) with 32 students and the second group (87.4%) with 115 students. From the results of these data, it can be concluded that the criteria for learning media products for floor exercise materials based on mobile learning have very valid criteria and are suitable for use in learning activities in schools.