Fenomen mehanosorpcijskog puzanja ambalaže od valovitog kartona

Denis Jurečić, Tigran Jokić, Petar Miljković, Martina Friščić, Olivera Međugorac

Sažetak

Tlačno puzanje, osobito ono koje je uzrokovano kružnim izmjenama relativne vlažnosti u zraku smatra se glavnim uzrokom lomova (urušavanja) kutija. Sadržaj vlage kartona koji je u ravnoteži sa okolnim zrakom ovisi o relativnoj vlažnosti tog zraka, sastavu kartona te načinu na koji je postignuto ravnotežno stanje (primanjem ili otpuštanjem vlage). Zbog higroskopnosti celuloznih vlaknaca, pojačava se reološko ponašanje valovitog kartona, odnosno dolazi do porasta deformacija u jedinici vremena pri konstantnom tlačnom opterećenju što ima za posljedicu značajno smanjenje vijeka trajanja ambalaže. Tlačna čvrstoća je jedno od najvažnijih svojstava kutija od valovitog kartona. Kutije moraju izdržati različite manipulacije i opterećenja u skladištima te prilikom transporta i pretovara. ECT je ključni test jer direktno povezuje tlačnu čvrstoću kutije od valovitog kartona i njezine sastavnice. Cilj istraživanja je pronaći graničnu (maksimalnu) vrijednost vlage u kartonu, koja neće uzrokovati urušavanje kutija naslaganih na paleti te pronaći optimalne uvjete u sustavu uskaldištenja kutije s agrokulturom.

Ključne riječi: puzanje, tlačna čvrstoća, ambalaža, mehanosorpcija
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