Vim li cas thiaj siv kraft ntawv ua lub hnab ntim khoom noj?

Kraft daim ntawv ntim tau ib txwm nyiam los ntawm txhua qhov chaw ntawm lub neej, thiab kev lag luam catering tsis muaj qhov tshwj xeeb. Ntau tus tub lag luam hauv kev lag luam catering siv kraft ntawv ua ntim khoom noj. Dab tsi yog cov txiaj ntsig ntawm kev siv kraft ntawv ua cov khoom siv raw rau cov ntawv ntim khoom noj?

Ua ntej tshaj plaws, vim tias cov hnab ntawv kraft tsis muaj tshuaj lom, tsis muaj kuab lom thiab tsis muaj kuab lom, lawv tau ua raws li lub tswv yim tiv thaiv ib puag ncig uas tau tawm suab los ntawm lub tebchaws. Lawv kuj yog ib qho ntawm cov khoom ntim nrov tshaj plaws nyob hauv lub ntiaj teb txij li lawv lub zog siab thiab kev tiv thaiv ib puag ncig. Kraft daim ntawv hnab ua los ntawm cov ntawv kraft raws li cov ntaub ntawv nyoos tau rub rau hauv kev xav ntau dua thiab tuaj yeem pom thoob plaws hauv khw muag khoom, khw muag khoom, khw muag khaub ncaws thiab lwm qhov chaw yuav khoom. Hauv qhov no, kev lag luam catering tau ntes nrog cov nthwv dej ntawm kev zoo siab thiab tau yooj yim dua los ntawm cov neeg siv khoom. Thiab kraft ntawv hnab yog tsim nyog rau cov qauv luam ntawv, uas yog tshiab.

Tsis tas li ntawd, kraft ntawv yog ua los ntawm cov ntawv ntoo tag nrho, thiab cov xim tau muab faib ua cov ntawv dawb kraft thiab daj kraft ntawv. Ib txheej ntawm cov khoom PP tuaj yeem siv rau ntawm daim ntawv los tiv thaiv cov roj thiab dej. Lub zog ntawm lub hnab tuaj yeem ua rau ib mus rau rau txheej raws li cov neeg siv khoom xav tau, thiab kev luam ntawv thiab lub hnab ntim khoom yog kev sib xyaw ua ke. Raws li peb txhua tus paub, daim ntawv yog cov khoom siv rov ua dua tshiab. Cov ntaub ntawv raw rau papermaking feem ntau yog cog strands. Ntxiv rau peb lub ntsiab lus tseem ceeb ntawm cellulose, hemicellulose thiab lignin, muaj lwm yam khoom siv nrog cov ntsiab lus qis, xws li cob thiab tshauv. Tsis tas li ntawd, muaj cov khoom pabcuam xws li sodium sulfate. Cov hnab yas uas peb siv ua ntej tau txais kev txhawb nqa los ntawm polyethylene, thiab cov khoom siv raw ntawm polyethylene yog roj av, uas yog cov khoom siv tsis tau txuas ntxiv dua tshiab. Hauv kev sib piv, cov hnab ntim khoom noj ua los ntawm cov ntawv kraft yog nrov dua nrog cov tub lag luam vim lawv cov yam ntxwv degradable thiab recyclable.

Hais txog thawj lub hnab ntawv kraft rau kev yuav khoom, nws tau yug los hauv St. Paul, Minnesota, Tebchaws Asmeskas hauv xyoo 1908. Txhawm rau txhawb kev muag khoom loj hlob, Walter Duvina, tus tswv khw muag khoom noj hauv zos tau pib nrhiav txoj hauv kev tso cai rau cov neeg siv khoom yuav khoom. ntau yam ntawm ib zaug. Duvina ntseeg hais tias nws yuav tsum yog lub hnab prefabricated uas yog tus nqi qis thiab siv tau yooj yim, thiab tuaj yeem tiv taus qhov hnyav li ntawm 75 phaus. Tom qab rov ua qhov kev sim, nws tau kaw qhov kev ntxhib los mos ntawm lub hnab no rau ntawm daim ntawv kraft, vim tias nws siv cov ntoo coniferous nrog ntev ntoo fibers los ua pulp, thiab kho nrog caustic soda thiab alkali sulfide tshuaj nrog cov tshuaj me me thaum lub sij hawm ua noj, yog li ntawd. thawj lub zog ntawm cov ntoo fibers yog tsawg puas. Yog li ntawd, daim ntawv tsim nyob rau hauv qhov kawg muaj kev sib txuas nruj ntawm fibers, thiab daim ntawv yog tawv thiab muaj peev xwm tiv taus ntau dua nro thiab siab tsis tawg. Plaub xyoos tom qab, thawj lub hnab ntawv kraft rau kev yuav khoom tau yug los. Nws muaj cov duab plaub hauv qab thiab lub ntim loj dua li cov hnab ntawv V-hauv qab. Ib txoj hlua khiav los ntawm nws hauv qab thiab ob sab kom nws lub peev xwm thauj khoom, thiab ob lub nplhaib rub yog tsim rau saum lub hnab ntawv rau tib neeg nqa. Duvina npe lub hnab khw no tom qab nws tus kheej thiab tau thov rau daim ntawv pov thawj rau nws xyoo 1915. Lub sijhawm no, kev muag khoom txhua xyoo ntawm lub hnab khw no tau tshaj 100 lab.

Nrog rau thoob ntiaj teb kev nthuav dav ntawm "kev tiv thaiv yas", cov neeg nyob ib puag ncig tau pib tig lawv lub ntsej muag rau lub hnab ntawv kraft thaum ub. McDonald's Tuam Tshoj tau maj mam txhawb kev siv cov khoom siv hluav taws xob hluav taws xob hluav taws xob kraft los tuav cov khoom noj hauv txhua lub khw txij li xyoo 2006, hloov cov hnab ntim khoom noj. Qhov kev txav no kuj tau txais cov lus teb zoo los ntawm lwm cov lag luam, xws li Nike, Adidas thiab lwm cov neeg siv hnab yas loj, uas tau pib siv cov hnab ntawv zoo kraft los hloov cov hnab yas. Hauv cov ntsiab lus, cov hnab ntim khoom noj muaj roj pov thawj thiab tsis muaj dej, yog cov khoom siv txuas ntxiv dua tshiab, thiab yog cov qauv tag nrho niaj hnub no.