Access profile

Given the multidisciplinary nature of the scientific field of the programme, there are a wide range of degrees that qualify applicants for admission. The most suitable prior learning to enter the doctoral programme in Textile and Paper Engineering will correspond, in the near future, to graduates with scientific and technological backgrounds who have taken the master’s degree in Textile Design and Technology, the master’s degree in Paper and Graphics Technology, the master’s degree in Textile, Paper and Graphics Engineering, the master’s degree in Fibrous Material Technology Engineering (specialisations in Textile Engineering or Paper and Graphics Engineering) or a related master’s degree in the scientific area of the programme.

In addition to this academic background, certain personal characteristics will be considered important, such as interest in the research projects that are developed in the programme, critical and analytical capacity, taking initiative, perseverance and persistence in work, and the capacity to work in a team and communicate well in spoken and written form.

Output profile

Doctoral candidates who complete a doctoral degree will have acquired the following competencies, which are needed to carry out quality research (Royal Decree 99/2011, of 28 January, which regulates official doctoral studies):

a) A systematic understanding of the field of study and a mastery of the research skills and methods related to the field.
b) An ability to conceive, design or create, put into practice and adopt a substantial process of research or creation.
c) An ability to contribute to pushing back the frontiers of knowledge through original research.
d) A capacity for critical analysis and an ability to assess and summarise new and complex ideas.
e) An ability to communicate with the academic and scientific community and with society in general as regards their fields of knowledge in the manner and languages that are typical of the international scientific community to which they belong.
f) An ability to foster scientific, technological, social, artistic and cultural progress in academic and professional contexts within a knowledge-based society.

The award of a doctoral degree must equip the graduate for work in a variety of settings, especially those requiring creativity and innovation. Doctoral graduates must have at least acquired the personal skills needed to:

a) Develop in contexts in which there is little specific information.
b) Find the key questions that must be answered to solve a complex problem.
c) Design, create, develop and undertake original, innovative projects in their field.
d) Work as part of a team and independently in an international or multidisciplinary context.
e) Integrate knowledge, deal with complexity and make judgements with limited information.
f) Offer criticism on and intellectually defend solutions.

Finally, with respect to competencies, doctoral students must:
a) have acquired advanced knowledge at the frontier of their discipline and demonstrated, in the context of internationally recognised scientific research, a deep, detailed and well-grounded understanding of theoretical and practical issues and scientific methodology in one or more research fields;
b) have made an original and significant contribution to scientific research in their field of expertise that has been recognised as such by the international scientific community;
c) have demonstrated that they are capable of designing a research project that serves as a framework for carrying out a critical analysis and assessment of imprecise situations, in which they are able to apply their contributions, expertise and working method to synthesise new and complex ideas that yield a deeper knowledge of the research context in which they work;
d) have developed sufficient autonomy to set up, manage and lead innovative research teams and projects and scientific collaborations (both national and international) within their subject area, in multidisciplinary contexts and, where appropriate, with a substantial element of knowledge transfer;
e) have demonstrated that they are able to carry out their research activity in a socially responsible manner and with scientific integrity;
f) have demonstrated, within their specific scientific context, that they are able to make cultural, social or technological advances and promote innovation in all areas within a knowledge-based society;
g) have demonstrated that they are able to participate in scientific discussions at the international level in their field of expertise and disseminate the results of their research activity to audiences of all kinds.

Number of places

5

Duration of studies and dedication regime

Duration
The maximum period of study for full-time doctoral studies is three years, counted from the date of admission to the programme to the date of submission of the doctoral thesis. The academic committee of the doctoral programme may authorise a doctoral candidate to pursue doctoral studies on a part-time basis. In this case, the maximum period of study is five years, counting from the date of admission to the programme to the date of submission of the doctoral thesis. For calculating these periods, the date of admission is considered to be the date of the first enrolment for tutorials, and the date of submission the moment in which the Doctoral School officially deposits the doctoral thesis.

For full-time doctoral candidates, the minimum period of study is two years, counted from the date of an applicant's admission to the programme until the date on which the doctoral thesis is deposited; for part-time doctoral candidates it is four years. When there are justified grounds for doing so, and the thesis supervisor and academic tutor have given their authorisation, doctoral candidates may request that the academic committee of their doctoral programme exempt them from the minimum period of study requirement.

The calculation of periods of study will not include periods of absence due to illness, pregnancy or any other reason provided for in the regulations in force. Students who find themselves in any of these circumstances must notify the academic committee of the doctoral programme, which, where appropriate, must inform the Doctoral School. Doctoral candidates may also temporarily withdraw from the programme for up to one year, and this period may be extended for an additional year. Doctoral candidates who wish to interrupt their studies must submit a justified request to the academic committee of the doctoral programme, which will decide whether or not to approve the request. Each programme will establish conditions for readmission to doctoral studies.

Extension
If full-time doctoral candidates have not applied to deposit their thesis by the end of the three-year period of study, the academic committee of the programme may authorise an extension of up to one year. In exceptional circumstances, a further one-year extension may be granted, subject to the conditions established by the corresponding doctoral programme. In the case of part-time doctoral candidates, an extension of two years may be authorised. In both cases, in exceptional circumstances a further one-year extension may be granted by the Doctoral School's Standing Committee, upon the submission of a reasoned application by the academic committee of the doctoral programme.

Dismissal from the doctoral programme
A doctoral candidate may be dismissed from a doctoral programme for the following reasons:

• The doctoral candidate submitting a justified application to withdraw from the programme.
• The maximum period of study and of extensions thereof ending.
• The doctoral candidate not having enrolled every academic year (unless he or she has been authorised to temporarily withdraw).
• The doctoral candidate failing two consecutive assessments.
• The doctoral candidate having disciplinary proceedings filed against him or her that rule that he or she must be dismissed from the UPC.

Dismissal from the programme implies that doctoral candidates cannot continue studying at the UPC and the closing of their academic record. This notwithstanding, they may apply to the academic committee of the programme for readmission and the committee must reevaluate them in accordance with the criteria established in the regulations.

Organization

• Cayuela Marin, Diana

• Ardanuy Raso, Monica
• Cayuela Marin, Diana
• Lopez Grimau, Victor
• Roncero Vivero, Blanca
• Vidal Llucia, Teresa

• Terrassa Institute of Textile Research and Industrial Cooperation (PROMOTORA)
• Department of Graphic and Design Engineering
• Department of Materials Science and Metallurgy
• Terrassa Institute of Textile Research and Industrial Cooperation

Agreements with other institutions

Collaborations are undertaken with national and international universities and research centres. The types of collaboration are: exchanges of doctoral students, participation in joint projects (Spanish and European), use of equipment, examination committees, thesis assessment. Below are some of the collaborating researchers.

F. IJ Pastor, University of Barcelona, Department of Microbiology.

José Carlos del Río, IRNAS-CSIC, Seville
Ana Gutiérrez, IRNAS-CSIC, Seville

José Ariza, University of Huelva, Department of Chemical Engineering and Inorganic Chemistry

Gumersido Feijó, University of Santiago de Compostela, Department of Chemical Engineering

Ángeles Sanromán, University of Vigo, Department of Chemical Engineering

Jean Claude Sigoillot, UMR INRA-BCF, 163, Avenue de Luminy, 13288 Marseille (France)

Graziano Elegi, Stazione Sperimentale Carta, Cartoni e Paste per Carta

the Italian Pulp and Paper Research Institute, Piazza Leonardo da Vinci, 16 - 20133 Milan (Italy)

Carlos Pascoal Neto, University of Aveiro, Department of Chemistry
Campus Universitário de Santiago - 3810-193 Aveiro (Portugal)

Jiebing Li, Royal Institute of Technology, Kungliga Tekniska Högskolan (KTH)
Teknikningen, 56-58 - 10044 Stockholm (Sweden)

Albert Manich, Institute for Advanced Chemistry of Catalonia (CSIC)
C/ Jordi Girona 18-26 - 08034 Barcelona

Orlando Rojas, Faculty of Chemistry and Materials Sciences, Department of Forest Products
Vuorimiehentie 1. Espoo - FI-00076 Aalto (Finland)

M. Soledad Peresin, University of Aurbun

Edith Marleny Cadena, National University of Colombia, Medellín

You-Lo Hsieh, University of California Davis, Materials Science and Engineering
Davis (USA)

Miguel Ángel Rodríguez-Pérez, University of Valladolid, Department of Condensed Matter Physics

Romildo Dias Toledo Filho, Federal University of Rio de Janeiro (COPPE/UFRJ), Civil Engineering Department, Rio de Janeiro (Brazil)

Holmer Savastano Junior, University of São Paulo, Department of Biosystems Engineering
São Paulo (Brazil)

. Qian Hongfei, PhD, Shaoxing University, School of Textile and Apparel
Shaoxing (China)

Access profile

Given the multidisciplinary nature of the scientific field of the programme, there are a wide range of degrees that qualify applicants for admission. The most suitable prior learning to enter the doctoral programme in Textile and Paper Engineering will correspond, in the near future, to graduates with scientific and technological backgrounds who have taken the master’s degree in Textile Design and Technology, the master’s degree in Paper and Graphics Technology, the master’s degree in Textile, Paper and Graphics Engineering, the master’s degree in Fibrous Material Technology Engineering (specialisations in Textile Engineering or Paper and Graphics Engineering) or a related master’s degree in the scientific area of the programme.

In addition to this academic background, certain personal characteristics will be considered important, such as interest in the research projects that are developed in the programme, critical and analytical capacity, taking initiative, perseverance and persistence in work, and the capacity to work in a team and communicate well in spoken and written form.

Access requirements

Applicants must hold a Spanish bachelor’s degree or equivalent and a Spanish master’s degree or equivalent, provided they have completed a minimum of 300 ECTS credits on the two degrees (Royal Decree 43/2015, of 2 February)

In addition, the following may apply:

• Holders of an official degree awarded by a university in Spain or any other country in the European Higher Education Area, pursuant to the provisions of Article 16 of Royal Decree 1393/2007, of 29 October, which establishes official university course regulations, who have completed a minimum of 300 ECTS credits on official university degrees, of which at least 60 must be at the master's degree level.
• Holders of an official Spanish bachelor’s degree comprising at least 300 credits, as provided for by EU regulations. Holder of degrees of this kind must complete bridging courses unless the curriculum of the bachelor’s degree in question included research training credits equivalent in value to those which would be earned on a master's degree.
• Holders of an official university qualification who, having passed the entrance examination for specialised medical training, have completed at least two years of a training course leading to an official degree in a health-sciences specialisation.
• Holders of a degree issued under a foreign education system. In these cases, homologation is not required, but the UPC must verify that the degree certifies a level of training equivalent to an official Spanish master's degree and qualifies the holder for admission to doctoral studies in the country where it was issued. Admission on this basis does not imply homologation of the foreign degree or its recognition for any purpose other than admission to doctoral studies.
• Holders of a Spanish doctoral qualification issued under previous university regulations.

Note 1: Doctoral studies entrance regulations for holders of an undergraduate degree awarded before the introduction of the EHEA (CG 47/02 2014)

Note 2: Governing Council Decision 64/2014, which approves the procedure and criteria for assessing the fulfilment of academic admission requirements for doctoral studies by holders of non-homologated foreign degrees (CG 25/03 2014)

Admission criteria and merits assessment

The academic committee of the doctoral programme will assess applications taking into account the following aspects:

• Academic record (weighting: 40%).
• Personal contact through questionnaires, exercises, interviews (personal, telephone, Skype, etc.), personal interview (face-to-face, telephone, Skype, etc.) (weighting: 20%). The interview will be held before two doctoral degree holders from the programme, one from each research line. They will assess: the academic and professional career (when applicable), whether the applicant has had previous contact with subject areas in one of the research lines, a previous research visit in research groups or centres, placements in companies relating to the research lines.
• Motivation (weighting: 10%). They will assess: interest in research lines on the doctoral programme; availability for mobility; availability to collaborate with other groups; teamwork; collaboration in research projects.
• Knowledge of languages: level of English above the minimum that is required, German and French, among others (weighting: 20%).
• Research experience (weighting: 10%).

Training complements

The academic committee for the programme may require that doctoral students pass specific bridging courses. In this case, it will monitor the bridging courses that are taken and establish suitable criteria to limit their duration.

The bridging courses will be on research training, but doctoral students will never be asked to enrol for a number equal to or above 60 ECTS. The academic regulations of doctoral studies state that bridging courses may also be cross-disciplinary. However, this point is likely to be amended so that bridging courses are only associated with research credits, particularly when an applicant enters the doctoral programme with a bachelor’s degree worth 300 ECTS.

Considering the doctoral student activity report (DAD), the academic committee of the programme could propose additional measure to those established in the regulations that lead to the withdrawal of doctoral students who do not meet the established criteria.

Students who have taken the master’s degree in Textiles Design and Technology, the master’s degree in Paper and Graphics Technology, the master’s degree in Textile, Paper and Graphics Engineering or the master's degree in Fibrous Material Technology Engineering (specialisations: Textile Engineering or Paper and Graphics Engineering) should not carry out bridging courses.

Students from master’s degrees in the area of engineering (industrial, chemical, forestry, materials or equivalent), master’s degrees in the area of sciences (chemistry, biology, biotechnology, biochemistry, the environment or equivalent ) and other qualifications that will be considered by the doctoral programme committee will have to take bridging courses. The committee will determine which bridging courses are required, according to the academic background of the doctoral students and the research line that they are interested in. Bridging courses will be taken during the first year of the doctoral studies.

Due to the range of academic backgrounds and the two research lines (textile engineering and paper engineering), it is difficult to specify in advance the subjects from the master’s degree in Textiles Design and Technology and the master’s degree in Paper and Graphics Technology that will need to be taken by each student. These will be defined as mentioned in the previous paragraph depending on the original qualification, the CV and the chosen research line.

Depending on their academic background, CV and selected research line, students should take between 5-30 ECTS as bridging courses. The bridging courses will be selected by the academic committee of the programme from among those indicated above.

Enrolment period for new doctoral students

Students enrolling in the doctoral programme for the first time must do so by the deadline specified in the admission decision.

More information at the registration section for new doctoral students

Enrolment period

In the first half of October.

More information at the general registration section

Procedure for the preparation and defense of the research plan

Doctoral candidates must submit a research plan, which will be included in their doctoral student activity report, before the end of the first year. The plan may be improved over the course of the doctoral degree. It must be endorsed by the tutor and the supervisor, and it must include the method that is to be followed and the aims of the research.

At least one of these annual assessments will include a public presentation and defence of the research plan and work done before a committee composed of three doctoral degree holders, which will be conducted in the manner determined by each academic committee. The examination committee awards a Pass or Fail mark. A Pass mark is a prerequisite for continuing on the doctoral programme. Doctoral candidates awarded a Fail mark must submit a new research plan for assessment by the academic committee of the doctoral programme within six months.

The committee assesses the research plan every year, in addition to all of the other activities in the doctoral student activity report. Doctoral candidates who are awarded two consecutive Fail marks for the research plan will be obliged to definitely withdraw from the programme.

If they change the subject of their thesis, they must submit a new research plan.

Formation activities

Activity: Tutorial.
- Hours: 288.
- Type: compulsory.

Activity: Publications.
- Hours: 900.
- Type: compulsory.

Activity: Mobility.
- Hours: 480.
- Type: optional.

Activity: Assessment based on doctoral student activity report (DAD) and research plan.
- Hours: 4.
- Type: compulsory.

Activity: Training in information skills.
- Hours: 1.5.
- Type: optional.

Activity: Research methodology.
- Hours: 12.
- Type: optional.

Activity: Innovation and creativity.
- Hours: 8.
- Type: optional.

Activity: Language and communication skills.
- Hours: 18.
- Type: optional.

Activity: Courses and seminars.
- Hours: 8.
- Type: optional.

Activity: Workshops.
- Hours: 8.
- Type: optional.

Procedure for assignment of tutor and thesis director

The academic committee of the doctoral programme assigns a thesis supervisor to each doctoral candidate when they are admitted or enrol for the first time, taking account of the thesis supervision commitment referred to in the admission decision.

The thesis supervisor will ensure that training activities carried out by the doctoral candidate are coherent and suitable, and that the topic of the candidate’s doctoral thesis will have an impact and make a novel contribution to knowledge in the relevant field. The thesis supervisor will also guide the doctoral candidate in planning the thesis and, if necessary, tailoring it to any other projects or activities undertaken. The thesis supervisor will generally be a UPC professor or researcher who holds a doctoral degree and has documented research experience. This includes PhD-holding staff at associated schools (as determined by the Governing Council) and UPC-affiliated research institutes (in accordance with corresponding collaboration and affiliation agreements). When thesis supervisors are UPC staff members, they also act as the doctoral candidate’s tutor.

PhD holders who do not meet these criteria (as a result of their contractual relationship or the nature of the institution to which they are attached) must be approved by the UPC Doctoral School's Standing Committee in order to participate in a doctoral programme as researchers with documented research experience.

The academic committee of the doctoral programme may approve the appointment of a PhD-holding expert who is not a UPC staff member as a candidate’s thesis supervisor. In such cases, the prior authorisation of the UPC Doctoral School's Standing Committee is required. A UPC staff member who holds a doctoral degree and has documented research experience must also be proposed to act as a co-supervisor, or as the doctoral candidate’s tutor if one has not been assigned.

A thesis supervisor may step down from this role if there are justified reasons (recognised as valid by the committee) for doing so. If this occurs, the academic committee of the doctoral programme will assign the doctoral candidate a new thesis supervisor.

Provided there are justified reasons for doing so, and after hearing any relevant input from the doctoral candidate, the academic committee of the doctoral programme may assign a new thesis supervisor at any time during the period of doctoral study.

If there are academic reasons for doing so (an interdisciplinary topic, joint or international programmes, etc.) and the academic committee of the programme gives its approval, an additional thesis supervisor may be assigned. Supervisors and co-supervisors have the same responsibilities and academic recognition.

The maximum number of supervisors of a doctoral thesis is two: a supervisor and a co-supervisor.

For theses carried out under a cotutelle agreement or as part of an Industrial Doctorate, if necessary and if the agreement foresees it this maximum number of supervisors may not apply. This notwithstanding, the maximum number of supervisors belonging to the UPC is two.

More information at the PhD theses section

Permanence

The academic committee of the programme may authorise an extension of up to one year for full-time doctoral candidates who have not applied to deposit their thesis by the end of the three-year period of study, in the terms outlined in the Academic Regulations for Doctoral Studies of the Universitat Politècnica de Catalunya. In the case of part-time candidates, an extension of two years may be authorised. In both cases, in exceptional circumstances a further one-year extension may be granted by the Doctoral School's Standing Committee, upon the submission of a reasoned application by the academic committee of the doctoral programme.

A doctoral candidate may be dismissed from a doctoral programme for the following reasons:

• The doctoral candidate submitting a justified application to withdraw from the programme.
• The maximum period of study and of extensions thereof ending.
• The doctoral candidate not having enrolled every academic year (unless he or she has been authorised to temporarily withdraw).
• The doctoral candidate failing two consecutive assessments.
• The doctoral candidate having disciplinary proceedings filed against him or her that rule that he or she must be dismissed from the UPC.

Dismissal from the programme implies that doctoral candidates cannot continue studying at the UPC and the closing of their academic record. This notwithstanding, they may apply to the academic committee of the programme for readmission and the committee must reevaluate them in accordance with the criteria established in the regulations.

International Mention

The doctoral degree certificate may include International Doctorate mention. In this case, the doctoral candidate must meet the following requirements:

a) During the period of study leading to the award of the doctoral degree, the doctoral candidate must have spent at least three months at a respected higher education institution or research centre outside Spain to complete courses or do research work. The stays and activities carried out must be endorsed by the thesis supervisor and authorised by the academic committee of the programme. The candidate must provide a certifying document issued by the person responsible for the research group of the body or bodies where the stay or activity was completed. This information will be added to the doctoral student’s activity report.
b) Part of the thesis (at least the summary and conclusions) must be written and presented in one of the languages commonly used for science communication in the relevant field of knowledge, which must not be an official language of Spain. This rule does not apply to stays and reports in Spanish or to experts from Spanish-speaking countries.
c) At least two PhD-holding experts belonging to a higher education institution or research centre outside Spain must have issued officially certified reports on the thesis.
d) The thesis examination committee must have included at least one PhD-holding expert from a higher education or research institution outside Spain who was not responsible for the candidate’s stay abroad (point a) above).
e) The thesis defence must have taken place on UPC premises or, in the case of joint programmes, at the location specified in the collaboration agreement.

List of authorized thesis for defense

• MIJAS VÉLEZ, GABRIELA DAYANA: Obtaining and ennobling of cottonised hemp fibres for textile substrates
  
  Author: MIJAS VÉLEZ, GABRIELA DAYANA
  Thesis file: (contact the Doctoral School to confirm you have a valid doctoral degree and to get the link to the thesis)
  Programme: DOCTORAL DEGREE IN TEXTILE AND PAPER ENGINEERING
  Department: Department of Textile and Paper Engineering (ETP)
  Mode: Temporary seizure
  Deposit date: 12/09/2022
  Reading date: 10/10/2022
  Reading time: 12:00
  Reading place: ETSEIAT_ Sala d'actes de l'INTEXTER (Carrer Colom 15, 08222 Terrassa)
  Thesis director: RIBA MOLINER, MARTA
  Committee:
       PRESIDENT: BONET ARACIL, MARÍA ÁNGELES
       SECRETARI: ARDANUY RASO, MONICA
       VOCAL: MAESTÁ BEZERRA, FABRICIO
  Thesis abstract: The main objective of this work has been to obtain fibres and subsequently yarns and fabrics that are suitable for textile applications, through the cottonisation of an agricultural by-product of hemp (Cannabis Sativa L.). The raw material used has come from a non-textile industrial hemp which, so far, is used in the production of oils and sedes and its by-product is also used in the paper industry and in the production of composite materials, but not materials with textile properties. The main problem with hemp, as well as other similar bast fibres, is the high lignin content, which makes it difficult to dry spin using conventional cotton and short fibre spinning techniques. By means of the cottonisation process developed in this study, which has consisted of the application of mechanical, alkaline and oxidising or enzymatic processes, a reduction in the content of non-cellulosic materials has been achieved, including lignin, which has been reduced by 79%. The substrate obtained after the aforementioned processes was blended with cotton in different proportions. Finally, yarns with a count of 40 tex have been obtained through Open-End rotor spinning and then, they were used to produce knitted fabrics. In addition, the substrates resulting have been dyed with natural and sulphurous dyes from natural raw materials to evaluate their behaviour by testing their fastness to different agents. On the other hand, the delignified fibres have been physically and chemically characterised to determine the influence of the alkaline treatment on their final properties. The delignification kinetics of the hemp fibres have also been studied to optimise the process and carry out an industrial scale-up of the process. The results showed that forced convection should be promoted by moving the chemical bath or the material to be treated and that there were no significant differences in the lignin content of the samples treated with NaOH = 0.5M. In this way, it was possible to reduce the amount of alkali initially used by 75%. Based on the results of the kinetics, the alkaline process has been scaled up and for this purpose, a reactor with bath recirculation has been designed and manufactured. This design has allowed the processing of up to 5 kg of hemp, at 80 °C, a temperature lightly lower than those at which these alkaline treatments are usually carried out. The hemp fibres were then treated in two different ways: with an oxidising treatment or with an enzymatic treatment. On the one hand, the fibres that have been treated with an oxidising process have been blended at a 25/75 hemp/cotton ratio to obtain drafter slivers. On the other hand, fibres that have been treated with enzymes have been subsequently blended at a 50/50 hemp/cotton ratio to obtain slivers at laboratory scale. In both cases, it has been possible to spin yarns through Open-End rotor spinning with a 40-tex count and with adequate strength to make knitted fabrics. Finally, the softness of the 50/50 and 25/75 hemp/cotton fabrics has been evaluated, considering a 100% cotton fabric of similar characteristics as a reference. With this, it has been possible to conclude that, in the case of the fabrics with a greater quantity of hemp, an acceptable softness has been obtained despite the high hemp content, and in the second case, the softness has been very similar to that of 100% cotton. This study has determined that, by means of the developed cottonisation process, an agricultural hemp by-product with no initial textile use is susceptible to being spun and knitted, enabling substrates with properties similar to those of cotton to be obtained.
  

Last update: 06/10/2022 04:45:23.

List of lodged theses

• GÜNTHER, KAROLINE: Analysis of the influence of false twist integrated into a high speed drafting system of an air jet spinning machine
  
  Author: GÜNTHER, KAROLINE
  Thesis file: (contact the Doctoral School to confirm you have a valid doctoral degree and to get the link to the thesis)
  Programme: DOCTORAL DEGREE IN TEXTILE AND PAPER ENGINEERING
  Department: Department of Textile and Paper Engineering (ETP)
  Mode: Normal
  Deposit date: 27/09/2022
  Reading date: pending
  Reading time: pending
  Reading place: pending
  Thesis director: TORNERO GARCÍA, JOSÉ ANTONIO | WEIDE, THOMAS
  Committee:
       PRESIDENT: DIAZ GARCIA, PABLO
       SECRETARI: CANO CASAS, FRANCESC
       VOCAL: TZVETKOVA, MILENA DIMTCHOVA
  Thesis abstract: Air jet spinning is an emerging technology, already well established in the textile market. The commercial success increased over the last decades and intensified the research and innovation approach in the field of air jet spinning machines. The requirements for establishing air spun yarn in the textile market include high yarn quality, high production speeds and high material yield during the process.The concept and the quality of the integrated drafting system of an air jet spinning machine is one of the responsible parts to influence the named requirements. Moreover, the drafting system directly influences the regularity of fibre motion during the transportation to the spinning nozzle. In this case, the fibres need to deal with challenges like highly increasing velocities of the roller pairs and resulting air turbulences which cause misaligned fibres at the main draft zone.False twist is a welt-known principle in the textile process technology. False twist is used to stabilize the spinning stability, to create special effects on yarn structure or to impact the spinning process in general.Based on the principles of false twist, the aim of this work is to use the characteristics of false twist in the drafting system of an air jet spinning machine to improve the fibre motion during drafting. The PhD thesis presents the use of the principles of false twist implementation into the drafting system to influence the fibre control during high speed drafting for air jet spinning machines.Therefore, two prototypes were developed, tested, and evaluated by their impact for the fibre motion through the drafting system. A dynamic false twist device which can insert false twist individually set by torque and velocity into the drafted fibre bundle is used. Moreover, a video analysis tool was developed to measure the fibre motion. In the theoretical part, a control analysis of false twist integration into a fibre assembly was developed, which simplified the prediction of fibre movements. The theoretical analyses led to a better knowledge of the fibre movement within a high speed drafting system with high velocities.
  

Last update: 06/10/2022 04:30:28.

List of defended theses by year

No hi ha registres per mostrar.

Last update: 06/10/2022 05:01:04.

Research groups

• CELBIOTECH-Research Group: Paper Engineering
• ENMA-Environmental Engineering
• POLQUITEX-Polymeric Materials and Textile Chemistry
• TECTEX-Textile Technology Research Group

Teachers

• Ardanuy Raso, Monica
• Canal Arias, Josep M.
• Carrera Gallissa, Enric
• Carrillo Navarrete, Fernando
• Cayuela Marin, Diana
• Gutierrez Bouzan, Maria Carmen
• Lis Arias, Manuel Jose
• Lopez Grimau, Victor
• Riba Moliner, Marta
• Roncero Vivero, Blanca
• Tornero Garcia, Jose Antonio
• Valls Vidal, Cristina
• Ventura Casellas, Heura
• Vidal Llucia, Teresa