Impapuro zometseho za kraft zifite impande umunani, hepfo, zipfunyitse neza, zibora, zikoreshwa mu gusset y'ikawa, hasi, zishobora kongera gukoreshwa.

Gupfunyika ibishyimbo bya kawa bikaranze (ifu) ni bwo buryo butandukanye bwo gupfunyika ikawa. Kubera ko ibishyimbo bya kawa bikunze gukora gaze karuboni nyuma yo gupfunyika, gupfunyika bitaziguye bishobora kwangiza ipfunyika byoroshye, kandi kumara igihe kirekire ugiye mu kirere bitera kubura impumuro nziza kandi bigatera amavuta n'impumuro nziza muri kawa. Gupfunyika ibishyimbo bya kawa (ifu) bituma ubuziranenge bwangirika. Kubwibyo, gupfunyika ibishyimbo bya kawa (ifu) ni ingenzi cyane.

Ikoreshwa cyane ku isoko ni ugupfunyika ibintu bivanze, ari byo bikoresho bibiri cyangwa byinshi bihuzwa binyuze mu buryo bumwe cyangwa bwinshi bwumye bwo gupfunyika kugira ngo bikore gupfunyika bifite imikorere runaka. Muri rusange, bishobora kugabanywamo urwego rw'ibanze, urwego rw'imikorere n'urwego rwo kuziba ubushyuhe. Urwego rw'ibanze rugira uruhare runini mu bwiza, gucapa no kurwanya ubushuhe. Nka BOPP, BOPET, BOPA, MT, KOP, KPET, nibindi; urwego rw'imikorere rugira uruhare runini mu kurinda imbogamizi no kurinda urumuri.

Niba wigeze ureba imifuka ya kawa muri supermarket cyangwa muri cafe, uzabona ko imifuka myinshi ifite umwobo muto cyangwa plastike hafi y'inyuma. Iyi valve igira uruhare runini mu gutuma ikawa ikomeza kuba nziza kandi iryoshye.

Iyi valve ni umuhanda umwe utuma ibishyimbo bya kawa n'ubutaka bwa kawa bisohora gaze karubone (CO2) buhoro buhoro n'indi myuka ihinduka mu gafuka bitanyuze mu mwuka wo hanze, izwi kandi nka valve ikomeza kubika, valve y'impumuro nziza cyangwa valve ya kawa.

Impungenge nyinshi za shimi zibaho iyo kawa ikaranze, kandi imyuka ihindagurika nka dioxyde de carbone iba mu bishyimbo. Iyi myuka yongera uburyohe muri kawa, ariko ikomeza kurekura igihe gito. Nyuma yo guteka, dioxyde de carbone itangira gusohoka, ariko bifata ibyumweru byinshi kugira ngo ishire burundu. Iyi valve yemerera dioxyde de carbone kurekurwa kandi ikabuza ogisijeni kwinjira. Iyi gahunda ibuza oxidation kandi yongera igihe cyo kuyikoresha. Iyo dioxyde de carbone irekuwe, itera igitutu imbere mu gipfunyika, bigatuma gasket ya rubber yoroshye ihinduka ikarekura iyo gaze. Nyuma y'uko irekurwa irangiye, igitutu cy'imbere n'inyuma birangana, gasket ya rubber isubira mu buryo bwayo bwa mbere, kandi agapfunyika kongera gufungwa.

Iyi valve igufasha kandi guhitamo ikawa yawe. Kubera ko uko igihe kigenda gihita impumuro ya kawa izasohoka binyuze muri valve nk'umwuka wa karuboni, impumuro izagabanuka uko ikawa igenda ishaza. Niba ushaka kugenzura ko ibishyimbo ari bishya mbere yo kugura, ushobora gukanda gato agafuka kugira ngo urekure umwuka unyuze muri valve. Impumuro ikomeye ya kawa ni ikimenyetso cyiza cy'uko ibishyimbo ari bishya, niba udahumura cyane nyuma yo kuyikanda gato, bivuze ko ikawa atari nshya cyane.