Ku boxa PP strap (polypropylene strap) kahle swina nkoka eka matirhelo ya ku paka xikan’we naku hunguta ntsengo. Nkongomiso lowu wu katsa ti parameter ta nkoka ta swihlawulekisi: ku anama (5–19mm), ku enta (0.35–0.80mm), matimba yo tshoveka (45–230kg), ku hetisa ehenhla, na swipimelo swa roll. Ku twisisa ndlela leyi parameter yin’wana na yin’wana yi khumbaka ku fambisana ka switirhisiwa, vuhlayiseki bya ndzhwalo, na ntsengo hinkwawo swi pfuna vatshila va ku xava ku boxa bandi leri faneleke eka ku tirhisiwa ka vona. Hi ku ya hi swipimelo swa indasitiri, ku hlamuseriwa lokunene ku hunguta nkarhi wo yima, ku antswisa ku tiya ka ndzhwalo, naswona ku antswisa ku durha ka swilo.
PP strapping (polypropylene strapping) yi tlanga xiave xa nkoka eka ku pakiwa ka vurimi, ku sirhelela ti hay bales, cotton, silage, na swibyariwa swa swibyariwa kuva swi hlayisiwa naku fambisiwa. Ku akiwa ka yona loku nga vekiki, ku cinca-cinca ka yona ni ku durha ka yona swi endla leswaku yi va leyinene eka ndhawu leyi lavaka swa vurimi. Yikumeka hiku anama kusuka eka 5mm kuya eka 19mm na matimba yo tshoveka kusuka eka 45kg kuya eka 230kg, PP strapping yi amukela hinkwaswo kusuka eka ti light crop bundles kuya eka ti heavy hay bales. Nkongomiso lowu wu lavisisa matirhiselo ya nkoka, mimbuyelo, na swipimelo swo hlawula swa PP strapping eka matirhelo yo paka ya vurimi.
Ku xava strap eka switirhisiwa swa cotton bale swilava ku twisisa swilaveko swa break force, swipimelo swa milawu, na vuswikoti bya vaphakeri. Kuya hi swipimelo swa JCIBPC, cotton bale strapping yifanele ku fikelela matimba yale hansi ya break ya 3,200–4,000 pounds kuya hi muxaka wa bale . Nkongomiso lowu wu katsa swibumabumelo swa nkoka swa ku xava ku katsa na swilaveko swa swihlawulekisi, swipimelo swa nkambisiso wa vaphakeri, na nxopaxopo wa ntsengo ku pfuna vaxavi ku teka swiboho leswi nga na vutivi eka matirhelo ya vona ya ku balela khotoni.
Ku kambela muendli wa PP strapping swi lava ku kamberiwa loku hlelekeke ka vuswikoti bya vumaki, tisisiteme ta ku tiyisisa khwalithi, na ku tshembheka ka mphakelo. Nkongomiso lowu wu katsa tindhawu ta nkoka ta nkombo ta nkambisiso: vuswikoti bya vuhumelerisi, vulawuri bya khwalithi, ku landzelerisa switifikheti, ku cinca-cinca ka ku cinca ka swilo hi ku landza swilaveko swa wena, nseketelo wa xithekiniki, ku tshembheka ka mphakelo, na ku tshamiseka ka swa timali. Ku twisisa swilo leswi swi pfuna vatshila va ku xava ku hlawula vaendli lava tisaka khwalithi leyi nga cincekiki na mphakelo lowu tshembekaka.