pā pā PS

ʻO ka manaʻo o ka pā PS he pā i hoʻohana mua ʻia i ka paʻi offset. I ka paʻi offset, hele mai ke kiʻi e paʻi ʻia mai kahi pepa alumini i uhi ʻia, i hoʻonoho ʻia a puni ka pahu paʻi. Hoʻomaʻamaʻa ʻia ka alumini i mea hydrophilic kona ʻili (e huki i ka wai), ʻoiai ʻo ka pā pā pā PS i kūkulu ʻia he hydrophobic.
ʻElua ʻano o ka pā PS: pāpaʻi PS maikaʻi a me pā pā PS ʻino. Ma waena o lākou, ʻo ka pā pala PS maikaʻi no ka māhele nui, i hoʻohana ʻia i ka hapa nui o nā hana paʻi ma waena a nui i kēia lā. Ua oo no hoi kona hana enehana.
Hana ʻia ka pā PS me ka substrate a me ka uhi pā pā PS, ʻo ia hoʻi, ka papa photosensitive. ʻO ka substrate ka hapa nui o ka papa kumu alumini. ʻO ka papa kiʻi paʻi kiʻi he papa i hana ʻia e ka uhi ʻana i ka wai photosensitive ma luna o ka pā kumu.
ʻO kāna mau mea nui he photosensitizer, mea hana kiʻiʻoniʻoni a me ka mea kōkua. ʻO ka photosensitizer maʻamau i hoʻohana ʻia i loko o nā pā PS maikaʻi ʻo ia ka diazonaphthoquinone type photosensitive resin aʻo kēlā me ka pā ʻole PS ʻaʻole hiki ke hoʻoheheʻe ʻia nā resins photosensitive ma muli o azide.
Loaʻa i ka pā positve PS nā mea maikaʻi o ke kaumaha māmā, ka hana paʻa, nā kiʻi akaka, nā papa waiwai, a me ka maikaʻi o ka paʻi kiʻekiʻe. ʻO kāna mea hana a me ka hoʻohana ʻana he hoʻololi nui i ka ʻoihana paʻi. I kēia manawa, ua hoʻohālikelike ʻia ka pā PS me ka hoʻonohonoho ʻano uila, ka hoʻokaʻawale kala uila, a me ka paʻi offset multicolor, i lilo i ʻōnaehana platemaking mainstream i kēia mau lā.