Thaum twg cov hnab ntim khoom ntim tau tsim?
Thaum twg cov hnab ntim khoom ntim tau tsim?

Video: Thaum twg cov hnab ntim khoom ntim tau tsim?

Video: Thaum twg cov hnab ntim khoom ntim tau tsim?
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Los ntawm Xyoo 1960s ntawm, lub tuam txhab tau ua raws li txoj cai nruj ntawm polyethylene ntim patents thiab los ntawm 1977 tau tsim nws lub hnab. Cov hnab yas khoom noj khoom haus tau qhia hauv Asmeskas xyoo 1979; Kroger thiab Safeway tau khaws lawv hauv xyoo 1982. Tab sis qee lub khw muag khoom tau siv lawv.

Tsis tas li lo lus nug yog, thaum twg cov hnab yas ntshiab tau tsim?

Polyethylene (hom feem ntau ntawm yas siv rau pov tseg hnab ) yog thawj zaug tsim nyob rau hauv 1898 tab sis nws tsis yog mus txog rau thaum nruab nrab xyoo 1950s uas muaj polyethylene high-density. invented.

Ib tug kuj nug, thaum twg peb pib siv yas? Thawj yas Raws li ib tug hluavtaws polymer yog tsim los ntawm phenol thiab formaldehyde, nrog thawj txoj kev siv tau yooj yim thiab pheej yig tau tsim nyob rau xyoo 1907, los ntawm Leo HendrikBaekeland, tus neeg Belgian-yug Asmeskas nyob hauv New Yorkstate.

Ib tug kuj nug, thaum twg yog lub hnab yas siv thawj zaug?

Qhov feem ntau yas hauv tam sim no siv ispolyethylene los yog polythene, ua los ntawm petrochemicalethylene. Txawm tias ua ntej tsim los ntawm kev sib tsoo hauv xyoo 1898 los ntawm German chemist Hans von Pechmann, nws tsis yog txog rau xyoo 1950 uas peb lees paub niaj hnub no. yas tau tsim txaus rau kev lag luam thiab pheej yig ntau lawm.

Lawv siv dab tsi ua ntej lub hnab khib nyiab?

Tsev neeg khib nyiab tau khaws cia rau hauv lub nroog-tsim metalcans, sau txhua lub lim tiam los ntawm cov neeg ua haujlwm huv. Ntau tus neeg pov khib nyiab ncaj qha rau hauv lub kaus poom; lwm tus siv ntawv hnab los yog daim ntawv liners, uas sai sai tau ntub thiab sloppy. In 1950, Canadian inventors Harry Wasylyk thiab Larry Hansen invented the hnab khib nyiab.

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