Ubukhulu obuyisisekelo buphakathi kokucaciswa okunganakwa kakhulu lapho abathengi bekhetha ibhande le-PET (ibhande le-polyester) ukuze basebenze ngokuzenzakalelayo. Ibhande elihlangabezana nazo zonke izidingo zomshini—ububanzi obulungile, ukujiya, namandla okuphuka—lisazobangela izinkinga zokuphakela uma usayizi walo oyinhloko ungafani nesikhiphi sekhanda esibophayo. Idayamitha emaphakathi engaphakathi, ububanzi beroli, kanye nobubanzi be-roll yangaphandle kufanele konke kuhambisane ne-spindle yomshini kanye nendlela yokuqaqa. Lo mhlahlandlela uchaza ubukhulu be-PET strap core, ukuthi buthinta kanjani ukusebenza kwekhanda lokubopha okuzenzakalelayo, kanye nendlela yokuqinisekisa ukuhambisana ngaphambi kokuthenga.
Ukukhetha phakathi kwebhande le-PET (ibhande le-polyester) kanye nebhande lensimbi kungenye yezinqumo ezibaluleke kakhulu ekufakweni kwezimboni. Ibhande le-PET linikeza ukonga izindleko ezingafika ku-50% ngonyawo ngalunye, liqeda izingozi zokulimala emiphethweni ebukhali kanye ne-snap-back, futhi linikeza ukugcinwa kwengcindezi ephakeme njengoba imithwalo ithula ngesikhathi sokuthutha. Izintambo zensimbi ziletha ukuqina okukhulu kwemithwalo enzima kakhulu kodwa ithwala izindleko ezifihliwe ezihlanganisa nezidingo eziphezulu zabasebenzi, ubungozi bokugqwala, kanye nokugqokwa kwemishini. Ngokwemininingwane yemboni, ibhande le-PET lihlinzeka ngokuphindwe kane komugqa ngethani ngalinye uma liqhathaniswa nensimbi, lishintsha ngokuyisisekelo isibalo sezindleko.
I-PET strap (i-polyester strap) izindinganiso zokulawula ikhwalithi ziqinisekisa ukusebenza okungaguquki nokuphepha komthwalo. Ngokusho kokucaciswa kwe-ASTM D3950, ukuhlolwa kwekhwalithi kufanele kuqinisekise amandla aqinile, ubude, ukunemba kobukhulu, namandla ophawu lokushisa. Lo mhlahlandlela uchaza izindinganiso ezibalulekile zokulawula ikhwalithi, izimiso zokuhlola, nokuthi yini abathengi okufanele bayibheke lapho beqinisekisa ikhwalithi yebhande le-PET.
Ibhande le-PET (ibhande le-polyester) seliphenduke into ethandwayo yokubopha ezisetshenziswa embonini esindayo, esikhundleni sensimbi ekuhlanganisweni kwekhoyili yensimbi, ukuhlanganisa izitini, ukupakishwa kwebale kakotini, kanye nokuvikela izingodo. Ngamandla aqinile afika ku-600 N/mm², ukugcinwa kwengcindezi okuhle kakhulu, nokusebenza okungagqwali, ibhande le-PET liletha amandla afana nensimbi ngaphandle kokushiyeka kwensimbi. Ngokusho kokuhlaziywa kwemboni, ibhande le-PET lingakwazi ukufaka esikhundleni sensimbi emisebenzini eminingi enzima, yehlise izindleko eziphelele ngo-30-50% kuyilapho ithuthukisa ukuphepha kwabasebenzi futhi iqeda ukugqwala.