{"id":4723,"date":"2026-03-12T10:31:36","date_gmt":"2026-03-12T02:31:36","guid":{"rendered":"https:\/\/mostebglass.com\/?p=4723"},"modified":"2026-03-12T10:31:45","modified_gmt":"2026-03-12T02:31:45","slug":"annealing-glass-vases-best-practices-to-prevent-cracking-in-production","status":"publish","type":"post","link":"https:\/\/mostebglass.com\/cs\/annealing-glass-vases-best-practices-to-prevent-cracking-in-production\/","title":{"rendered":"\u017d\u00edh\u00e1n\u00ed sklen\u011bn\u00fdch v\u00e1z: Nejlep\u0161\u00ed postupy pro prevenci prask\u00e1n\u00ed ve v\u00fdrob\u011b"},"content":{"rendered":"
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Proces \u017e\u00edh\u00e1n\u00ed sklen\u011bn\u00fdch v\u00e1z je bodem ve v\u00fdrob\u011b skla, kde se bu\u010f vyh\u00fdb\u00e1me skryt\u00fdm chyb\u00e1m, nebo je vytv\u00e1\u0159\u00edme ti\u0161e. Sklo se m\u016f\u017ee zd\u00e1t jednoduch\u00e9 a t\u00e9m\u011b\u0159 pr\u00e1zdn\u00e9, ale p\u0159i v\u00fdrob\u011b se chov\u00e1 jako hou\u017eevnat\u00fd materi\u00e1l, kter\u00fd si pamatuje v\u0161echny tepeln\u00e9 chyby, ke kter\u00fdm do\u0161lo b\u011bhem v\u00fdrobn\u00edho procesu. Byl jsem ve velk\u00fdch tov\u00e1rn\u00e1ch na obalov\u00e9 sklo na americk\u00e9m st\u0159edoz\u00e1pad\u011b a v men\u0161\u00edch d\u00edln\u00e1ch na dekorativn\u00ed sklo v Evrop\u011b a stejn\u00fd trend se opakuje znovu a znovu, a to: v\u011bt\u0161ina rozbit\u00fdch v\u00e1z nen\u00ed rozbita vadn\u00fdmi formami, k\u0159emi\u010dit\u00fdm p\u00edskem n\u00edzk\u00e9 kvality nebo \u0161patn\u00fdm n\u00e1vrhem. Skute\u010dn\u00fd probl\u00e9m obvykle za\u010d\u00edn\u00e1, kdy\u017e se krok \u017e\u00edh\u00e1n\u00ed neprovede spr\u00e1vn\u011b nebo ve sp\u011bchu. Jakmile roztaven\u00e1 sklen\u011bn\u00e1 v\u00e1za opou\u0161t\u00ed formu, vn\u011bj\u0161\u00ed povrch se okam\u017eit\u011b za\u010dne ochlazovat a vnit\u0159ek je extr\u00e9mn\u011b hork\u00fd. Tento teplotn\u00ed rozd\u00edl zp\u016fsobuje vnit\u0159n\u00ed nap\u011bt\u00ed ve sklen\u011bn\u00e9 s\u00edti a pokud se toto nap\u011bt\u00ed \u010dasem neodstran\u00ed \u0159\u00edzen\u00fdm oh\u0159evem a ochlazov\u00e1n\u00edm, m\u00e1 hotov\u00fd v\u00fdrobek neviditelnou struktur\u00e1ln\u00ed slabinu. Na n\u00e1dob\u00ed<\/a> M\u016f\u017ee se po opu\u0161t\u011bn\u00ed tov\u00e1rny jevit jako bezchybn\u00e1, ale nap\u011bt\u00ed, kter\u00e9 je skryt\u00e9 v materi\u00e1lu, p\u0159etrv\u00e1v\u00e1, dokud se v\u00e1za nerozbije vlivem vibrac\u00ed, zm\u011bny teploty nebo dokonce dotyku.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t

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1. Pochopen\u00ed procesu \u017e\u00edh\u00e1n\u00ed sklen\u011bn\u00fdch v\u00e1z ve v\u00fdrob\u011b<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
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V\u011bt\u0161ina procesu \u017e\u00edh\u00e1n\u00ed sklen\u011bn\u00fdch v\u00e1z je v podstat\u011b \u0159\u00edzen\u00fd proces tepeln\u00e9ho zpracov\u00e1n\u00ed, kter\u00fd stabilizuje nov\u011b vyvinut\u00e9 sklo uvoln\u011bn\u00edm vnit\u0159n\u00edho nap\u011bt\u00ed produktu p\u0159edt\u00edm, ne\u017e dos\u00e1hne pokojov\u00e9 teploty. Pro pr\u016fmyslovou v\u00fdrobu se nov\u011b vytvo\u0159en\u00e9 sklo v\u00e1zy<\/a> se p\u0159epravuj\u00ed p\u0159\u00edmo do dlouh\u00e9 pece s \u0159\u00edzenou teplotou zvan\u00e9 lehr. V t\u00e9to peci se sklo nech\u00e1 z\u016fstat bl\u00edzko sv\u00e9 \u017e\u00edhac\u00ed teploty dostate\u010dn\u011b dlouho, aby se uvolnilo nap\u011bt\u00ed uvnit\u0159 materi\u00e1lu. V p\u0159\u00edpad\u011b b\u011b\u017en\u00e9ho sodnov\u00e1penat\u00e9ho skla (obvykle obsahuj\u00edc\u00edho 70\u201374 % oxidu k\u0159emi\u010dit\u00e9ho (SiO2), 12\u201315 % oxidu sodn\u00e9ho (Na2O) a 8\u201310 % oxidu v\u00e1penat\u00e9ho (CaO)) je \u017e\u00edhac\u00ed teplota obvykle mezi 515 \u00b0C a 565 \u00b0C. Sklo je v tomto bod\u011b dostate\u010dn\u011b tvrd\u00e9, aby si udr\u017eelo sv\u016fj tvar, ale z\u00e1rove\u0148 dostate\u010dn\u011b m\u011bkk\u00e9, aby umo\u017enilo postupnou reorganizaci atomov\u00e9 struktury a uvoln\u011bn\u00ed nap\u011bt\u00ed.<\/p>

Po uvoln\u011bn\u00ed vnit\u0159n\u00edho nap\u011bt\u00ed se sklo pomalu prov\u00e1d\u00ed p\u0159es bod nap\u011bt\u00ed, kter\u00fd je obvykle p\u0159i 480 \u00b0C, kde se struktura st\u00e1v\u00e1 trvale tuhou. Rychlej\u0161\u00ed zmrazen\u00ed, ne\u017e materi\u00e1l proch\u00e1z\u00ed touto f\u00e1z\u00ed, je ekvivalentem zmrazen\u00ed vnit\u0159n\u00edho nap\u011bt\u00ed ve skle. Na prvn\u00ed pohled to nemus\u00ed b\u00fdt z\u0159ejm\u00e9, ale slabina struktury tam je. Studie americk\u00e9ho N\u00e1rodn\u00edho institutu pro standardy a technologie poukazuj\u00ed na to, \u017ee hlavn\u00edm d\u016fvodem, pro\u010d vyroben\u00e9 sklen\u011bn\u00e9 v\u00fdrobky st\u00e1le vykazuj\u00ed zbytkov\u00e9 nap\u011bt\u00ed a dlouhodob\u00e9 lomy, je nespr\u00e1vn\u00e1 rychlost ochlazov\u00e1n\u00ed (v\u00fdzkum materi\u00e1l\u016f NIST). To znamen\u00e1, \u017ee \u017e\u00edh\u00e1n\u00ed nen\u00ed jen kone\u010dn\u00e1 \u00faprava, ale okam\u017eik, kdy se zjist\u00ed, zda je struktura skla stabiln\u00ed.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t

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2. Pro\u010d sklen\u011bn\u00e9 v\u00e1zy praskaj\u00ed b\u011bhem \u017e\u00edh\u00e1n\u00ed<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
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Trhliny vznikl\u00e9 b\u011bhem \u017e\u00edh\u00e1n\u00ed jsou obvykle zp\u016fsobeny nerovnom\u011brn\u00fdm ochlazov\u00e1n\u00edm nebo nedostate\u010dnou dobou p\u0159i teplot\u011b \u017e\u00edh\u00e1n\u00ed. Sklen\u011bn\u00e9 v\u00e1zy<\/a> P\u0159edm\u011bty pou\u017e\u00edvan\u00e9 v dekorac\u00edch jsou velmi n\u00e1ro\u010dn\u00e9, proto\u017ee kv\u016fli sv\u00fdm tvar\u016fm z\u0159\u00eddka dosahuj\u00ed rovnom\u011brn\u00e9ho rozlo\u017een\u00ed tepla. \u0160irok\u00e9 okraje, \u00fazk\u00e1 hrdla a siln\u00e1 dna maj\u00ed r\u016fzn\u00e9 rychlosti ochlazov\u00e1n\u00ed, \u010d\u00edm\u017e v cel\u00e9m p\u0159edm\u011btu vytv\u00e1\u0159ej\u00ed teplotn\u00ed gradienty. Vnit\u0159n\u00ed tahov\u00e9 nap\u011bt\u00ed se ve struktu\u0159e vyv\u00edj\u00ed, kdy\u017e se \u010d\u00e1st skla smr\u0161\u0165uje pomaleji ne\u017e druh\u00e1 \u010d\u00e1st. Pokud je tento tlak v\u011bt\u0161\u00ed ne\u017e p\u0159irozen\u00e1 pevnost skla, trhliny se tvo\u0159\u00ed okam\u017eit\u011b nebo i pozd\u011bji, kdy\u017e je v\u00fdrobek mimo tov\u00e1rnu.<\/p>

Statistiky pr\u016fmyslov\u00e9 v\u00fdroby dokazuj\u00ed, jak drah\u00fd takov\u00fd probl\u00e9m m\u016f\u017ee b\u00fdt. Zbytkov\u00e9 pnut\u00ed a vady \u017e\u00edh\u00e1n\u00ed pat\u0159\u00ed k nej\u010dast\u011bj\u0161\u00edm probl\u00e9m\u016fm s kvalitou ve skl\u00e1\u0159sk\u00fdch v\u00fdrobn\u00edch procesech a k hlavn\u00edm p\u0159\u00ed\u010din\u00e1m odm\u00edtnut\u00ed v\u00fdrobk\u016f na velkoobjemov\u00fdch v\u00fdrobn\u00edch link\u00e1ch, jak publikoval Institut pro obaly skla (pr\u016fmyslov\u00e1 data). Plant\u00e1\u017ee, kter\u00e9 denn\u011b vyr\u00e1b\u011bj\u00ed des\u00edtky tis\u00edc sklen\u011bn\u00fdch v\u00fdrobk\u016f, si mohou dovolit ztratit n\u011bkolik procent produkce jen proto, \u017ee podm\u00ednky \u017e\u00edh\u00e1n\u00ed nebyly spr\u00e1vn\u011b nastaveny. V p\u0159\u00edpad\u011b v\u00fdrobc\u016f dekorac\u00ed skla se to v dlouhodob\u00e9m horizontu scvrk\u00e1v\u00e1 na tis\u00edce vadn\u00fdch v\u00fdrobk\u016f a tis\u00edce dolar\u016f ztracen\u00fdch.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t

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2.1. Teplotn\u00ed gradienty v peci b\u011bhem \u017e\u00edh\u00e1n\u00ed sklen\u011bn\u00fdch v\u00e1z<\/h3>\t\t\t\t<\/div>\n\t\t\t\t
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Teplota \u017e\u00edhac\u00ed pece v\u00fdznamn\u011b p\u0159isp\u00edv\u00e1 k \u0159\u00edzen\u00e9mu chlazen\u00ed sklen\u011bn\u00fdch v\u00e1z. \u017d\u00edhac\u00ed pece jsou obvykle rozd\u011bleny do n\u011bkolika oblast\u00ed s r\u016fzn\u00fdmi teplotami a oblasti s ni\u017e\u0161\u00edmi teplotami jsou um\u00edst\u011bny v postupn\u011b ni\u017e\u0161\u00edch poloh\u00e1ch vzhledem k produkt\u016fm p\u0159epravovan\u00fdm pec\u00ed. Nicm\u00e9n\u011b se od t\u011bchto oblast\u00ed o\u010dek\u00e1v\u00e1, \u017ee budou velmi stabiln\u00ed. I mal\u00e9 rozd\u00edly mohou vytv\u00e1\u0159et nerovnom\u011brn\u00e9 chladic\u00ed podm\u00ednky, co\u017e vede ke vzniku nam\u00e1h\u00e1n\u00ed skla. Nap\u0159\u00edklad kdy\u017e je jedna z\u00f3na v peci o 15\u201320 \u00b0C chladn\u011bj\u0161\u00ed ne\u017e zbytek z\u00f3ny, \u010d\u00e1st v\u00e1zy, kter\u00e1 je vystavena takov\u00e9mu proud\u011bn\u00ed vzduchu, se m\u016f\u017ee ochladit mnohem rychleji ne\u017e zbytek konstrukce.<\/p>

Takov\u00fd probl\u00e9m je obvykle neviditeln\u00fd, proto\u017ee sklo m\u016f\u017ee vypadat perfektn\u011b i po opu\u0161t\u011bn\u00ed v\u00fdrobn\u00ed linky. Vnit\u0159n\u00ed pnut\u00ed je pozorov\u00e1no pouze p\u0159i zkoum\u00e1n\u00ed pomoc\u00ed polariza\u010dn\u00edho sv\u011btla, kter\u00e9 odhal\u00ed vzorce nap\u011bt\u00ed v materi\u00e1lu. \u0158ada v\u00fdrobc\u016f, kte\u0159\u00ed se po kr\u00e1tk\u00e9 dob\u011b setkaj\u00ed s neo\u010dek\u00e1van\u00fdm prask\u00e1n\u00edm, zjist\u00ed, \u017ee probl\u00e9m spo\u010d\u00edv\u00e1 v nespr\u00e1vn\u00e9m proud\u011bn\u00ed vzduchu nebo vadn\u00fdch teplotn\u00edch senzorech uvnit\u0159 pece Lehr.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t

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2.2. Geometrie v\u00fdrobku a tlou\u0161\u0165ka st\u011bny<\/h3>\t\t\t\t<\/div>\n\t\t\t\t
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Dal\u0161\u00edm prvkem, kter\u00fd zt\u011b\u017euje spr\u00e1vn\u00e9 \u017e\u00edh\u00e1n\u00ed sklen\u011bn\u00fdch v\u00e1z, je rozd\u00edln\u00e1 tlou\u0161\u0165ka st\u011bn v dekorativn\u00edch vzorech. Siln\u00e9 sklen\u011bn\u00e9 dno udr\u017euje teplo mnohem d\u00e9le ve srovn\u00e1n\u00ed s tenkou st\u011bnou kolem okraje nebo hrdla. Pokud chladic\u00ed k\u0159ivka tento rozd\u00edl nezohledn\u00ed, vn\u011bj\u0161\u00ed st\u011bna m\u016f\u017ee ztuhnout a vnit\u0159n\u00ed st\u011bny dna se z\u016fstanou smr\u0161\u0165ovat. Tato nesrovnalost vytv\u00e1\u0159\u00ed vnit\u0159n\u00ed linie nap\u011bt\u00ed, kter\u00e9 podkop\u00e1vaj\u00ed kostru v\u00e1zy.<\/p>

Proto mohou b\u00fdt v\u00fdrobci nuceni upravit \u017e\u00edhac\u00ed cykly v p\u0159\u00edpad\u011b zm\u011bny designu v\u00e1zy. Vy\u0161\u0161\u00ed v\u00e1zy s v\u00fdrazn\u011bj\u0161\u00edmi z\u00e1kladnami se obvykle \u017e\u00edhaj\u00ed d\u00e9le ve srovn\u00e1n\u00ed s tenk\u00fdmi ozdobn\u00fdmi lahvemi nebo \u0161t\u00edhl\u00fdmi n\u00e1dobami. V\u00fdrobn\u00ed z\u00e1vody, kter\u00e9 tyto rozd\u00edly nezohled\u0148uj\u00ed, m\u00edvaj\u00ed vy\u0161\u0161\u00ed m\u00edru prask\u00e1n\u00ed, proto\u017ee k\u0159ivka ochlazov\u00e1n\u00ed byla optimalizov\u00e1na pro jeden produkt a pou\u017eita pro jin\u00fd.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t

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3. Doporu\u010den\u00e1 teplota \u017e\u00edh\u00e1n\u00ed a k\u0159ivka ochlazov\u00e1n\u00ed<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
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Aby se zajistilo, \u017ee b\u011bhem v\u00fdroby skla nedojde k prask\u00e1n\u00ed, nejjist\u011bj\u0161\u00ed metodou je zajistit, aby byla chladic\u00ed k\u0159ivka v peci Lehr dob\u0159e \u0159\u00edzena. P\u0159esto\u017ee p\u0159esn\u00e9 hodnoty z\u00e1vis\u00ed na slo\u017een\u00ed skla a tlou\u0161\u0165ce v\u00fdrobku, v\u011bt\u0161ina v\u00fdroby dekorativn\u00edch v\u00e1z prob\u00edh\u00e1 podobn\u00fdm zp\u016fsobem, jak\u00fd je uveden n\u00ed\u017ee.<\/p>
F\u00e1ze v\u00fdroby<\/td>Teplotn\u00ed rozsah<\/td>\u00da\u010del<\/td>Riziko p\u0159i \u0161patn\u00e9m \u0159\u00edzen\u00ed<\/td><\/tr>
Vstup do Lehru<\/td>540\u2013560 \u00b0C<\/td>Stabilizuje nov\u011b vytvo\u0159en\u00e9 sklo v bl\u00edzkosti bodu \u017e\u00edh\u00e1n\u00ed<\/td>N\u00e1hl\u00e9 ochlazen\u00ed zachycuje vnit\u0159n\u00ed nap\u011bt\u00ed<\/td><\/tr>
\u017d\u00edhac\u00ed z\u00f3na<\/td>520\u2013500 \u00b0C<\/td>Umo\u017e\u0148uje relaxaci molekul\u00e1rn\u00edho nap\u011bt\u00ed<\/td>Nerovnom\u011brn\u00e9 zah\u0159\u00edv\u00e1n\u00ed vytv\u00e1\u0159\u00ed gradienty nap\u011bt\u00ed<\/td><\/tr>
\u0158\u00edzen\u00e9 chlazen\u00ed<\/td>480\u2013350 \u00b0C<\/td>Sklo bezpe\u010dn\u011b proch\u00e1z\u00ed bodem nap\u011bt\u00ed<\/td>Rychl\u00e9 ochlazen\u00ed zp\u016fsobuje struktur\u00e1ln\u00ed slabost<\/td><\/tr>
Kone\u010dn\u00e9 ochlazen\u00ed<\/td>350\u201350 \u00b0C<\/td>Sklo se p\u0159ed balen\u00edm stabilizuje<\/td>Tepeln\u00fd \u0161ok m\u016f\u017ee zp\u016fsobit prask\u00e1n\u00ed<\/td><\/tr><\/tbody><\/table>

Konstantn\u00ed teplota umo\u017e\u0148uje rovnom\u011brn\u00e9 ochlazov\u00e1n\u00ed cel\u00e9ho sklen\u011bn\u00e9ho p\u0159edm\u011btu. To plat\u00ed zejm\u00e9na v p\u0159\u00edpad\u011b dekorativn\u00edch v\u00e1z, kter\u00e9 maj\u00ed slo\u017eit\u00e9 tvary nebo siln\u011bj\u0161\u00ed st\u011bny a jejich\u017e doba setrv\u00e1n\u00ed v peci trv\u00e1 d\u00e9le, aby se dos\u00e1hlo pot\u0159ebn\u00e9ho uvoln\u011bn\u00ed pnut\u00ed.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t

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4. Nejlep\u0161\u00ed postupy \u017e\u00edh\u00e1n\u00ed ve v\u00fdrob\u011b skla<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
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Mezi osv\u011bd\u010den\u00e9 postupy \u017e\u00edh\u00e1n\u00ed, kter\u00e9 jsou mezi v\u00fdrobci ve skl\u00e1\u0159sk\u00e9m pr\u016fmyslu v\u0161udyp\u0159\u00edtomn\u00e9, pat\u0159\u00ed v\u00fdrobci, kte\u0159\u00ed trvale dosahuj\u00ed n\u00edzk\u00e9 m\u00edry vad. Za prv\u00e9, udr\u017euj\u00ed stabiln\u00ed teploty v \u017e\u00edhac\u00ed peci pomoc\u00ed m\u011b\u0159ic\u00edch senzor\u016f a automatick\u00fdch \u0159\u00eddic\u00edch syst\u00e9m\u016f. Zm\u011bna teploty (i mal\u00e1 odchylka) m\u016f\u017ee b\u00fdt d\u016fle\u017eit\u00fdm faktorem, kter\u00fd je t\u0159eba zv\u00e1\u017eit, pokud jde o chov\u00e1n\u00ed p\u0159i chlazen\u00ed, a proto je nutn\u00e9 specifick\u00e9 monitorov\u00e1n\u00ed. Za druh\u00e9, optimalizuj\u00ed k\u0159ivky chlazen\u00ed na z\u00e1klad\u011b geometrie v\u00fdrobku, na rozd\u00edl od pou\u017eit\u00ed jednoho univerz\u00e1ln\u00edho \u017e\u00edhac\u00edho pl\u00e1nu pro ka\u017ed\u00fd n\u00e1vrh. Tato flexibilita poskytuje dostatek \u010dasu k relaxaci pnut\u00ed u siln\u011bj\u0161\u00edch nebo slo\u017eit\u011bj\u0161\u00edch tvar\u016f.<\/p>

Dal\u0161\u00ed st\u00e1le roz\u0161\u00ed\u0159en\u011bj\u0161\u00ed prax\u00ed je pou\u017e\u00edv\u00e1n\u00ed polaroskopick\u00fdch inspek\u010dn\u00edch syst\u00e9m\u016f, pomoc\u00ed kter\u00fdch jsou in\u017een\u00fd\u0159i schopni pozorovat vnit\u0159n\u00ed pnut\u00ed v dan\u00e9m hotov\u00e9m sklen\u011bn\u00e9m v\u00fdrobku. Polarizovan\u00e9 sv\u011btlo pozorovan\u00e9 na v\u00e1z\u00e1ch umo\u017e\u0148uje v\u00fdrobc\u016fm ur\u010dit oblasti se zbytkov\u00fdm nap\u011bt\u00edm a upravit parametry \u017e\u00edh\u00e1n\u00ed. Tuto proaktivn\u00ed strategii lze vyu\u017e\u00edt k zabr\u00e1n\u011bn\u00ed dod\u00e1n\u00ed vadn\u00e9ho zbo\u017e\u00ed spot\u0159ebiteli, a to krom\u011b zlep\u0161en\u00ed kontroly proces\u016f v dlouhodob\u00e9m horizontu.<\/p>

V\u00fdzkum v oblasti materi\u00e1lov\u00fdch v\u011bd tak\u00e9 ukazuje, \u017ee \u017e\u00edh\u00e1n\u00ed je kl\u00ed\u010dov\u00e9 pro prevenci opo\u017ed\u011bn\u00fdch lom\u016f. P\u0159\u00edtomnost inkluz\u00ed sulfidu nikelnat\u00e9ho je jedn\u00edm z dob\u0159e zdokumentovan\u00fdch d\u016fvod\u016f spont\u00e1nn\u00edho prask\u00e1n\u00ed, stejn\u011b jako drobn\u00e9 \u010d\u00e1stice, kter\u00e9 mohou v pr\u016fb\u011bhu \u010dasu ve struktu\u0159e skla r\u016fst. V\u00fdzkum na kated\u0159e materi\u00e1lov\u00fdch v\u011bd Cornellsk\u00e9 univerzity poskytuje vysv\u011btlen\u00ed, jak tyto inkluze mohou vyvolat opo\u017ed\u011bn\u00e9 lomy, kdy\u017e je ve sklen\u011bn\u00e9 matrici ji\u017e p\u0159\u00edtomno vnit\u0159n\u00ed nap\u011bt\u00ed (v\u00fdzkum v oblasti materi\u00e1lov\u00fdch v\u011bd Cornellsk\u00e9 univerzity). Toto riziko je v\u00fdznamn\u011b minimalizov\u00e1no spr\u00e1vn\u00fdm \u017e\u00edh\u00e1n\u00edm, kter\u00e9 minimalizuje podm\u00ednky nap\u011bt\u00ed, za kter\u00fdch se tyto vady budou \u0161\u00ed\u0159it.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t

\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\"\u017e\u00edh\u00e1n\u00ed\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t
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5. \u010casto kladen\u00e9 ot\u00e1zky<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
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5.1. Co je \u017e\u00edh\u00e1n\u00ed sklen\u011bn\u00fdch v\u00e1z?<\/h3>\t\t\t\t<\/div>\n\t\t\t\t
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\u017d\u00edh\u00e1n\u00ed sklen\u011bn\u00fdch v\u00e1z je proces oh\u0159evu a chlazen\u00ed skla, kter\u00fd zahrnuje regulaci oh\u0159evu a chlazen\u00ed sklen\u011bn\u00fdch p\u0159edm\u011bt\u016f, kter\u00e9 byly vytvo\u0159eny, aby se eliminovalo vnit\u0159n\u00ed pnut\u00ed ve sklen\u011bn\u00fdch v\u00fdrobc\u00edch. B\u011bhem tohoto procesu se v\u00e1zy udr\u017euj\u00ed na \u017e\u00edhac\u00ed teplot\u011b, obvykle mezi 515 \u00b0C a 565 \u00b0C, a pot\u00e9 se nechaj\u00ed postupn\u011b vychladnout, aby se zajistila stabilita vnit\u0159n\u00ed struktury a aby se v v\u00e1z\u00e1ch nevyvinuly lomy zp\u016fsoben\u00e9 nap\u011bt\u00edm.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t

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5.2 Jak\u00e1 teplota se pou\u017e\u00edv\u00e1 pro proces \u017e\u00edh\u00e1n\u00ed sklen\u011bn\u00fdch v\u00e1z?<\/h3>\t\t\t\t<\/div>\n\t\t\t\t
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\u017d\u00edh\u00e1n\u00ed sklen\u011bn\u00fdch v\u00e1z se obvykle pohybuje mezi 515 \u00b0C a 565 \u00b0C v z\u00e1vislosti na chemick\u00e9m slo\u017een\u00ed a tlou\u0161\u0165ce skla. V tomto teplotn\u00edm rozmez\u00ed bude sklo schopno uvolnit vnit\u0159n\u00ed nap\u011bt\u00ed molekul, ale zachov\u00e1 si sv\u016fj tvar, ne\u017e postupn\u011b ochlazuje na bod deformace p\u0159ibli\u017en\u011b 480 \u00b0C.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t

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5.3. Pro\u010d sklen\u011bn\u00e9 v\u00e1zy praskaj\u00ed b\u011bhem \u017e\u00edh\u00e1n\u00ed?<\/h3>\t\t\t\t<\/div>\n\t\t\t\t
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B\u011bhem procesu \u017e\u00edh\u00e1n\u00ed sklen\u011bn\u00e9 v\u00e1zy praskaj\u00ed v p\u0159\u00edpad\u011b p\u0159\u00edli\u0161 rychl\u00e9ho nebo nerovnom\u011brn\u00e9ho ochlazov\u00e1n\u00ed, co\u017e vytv\u00e1\u0159\u00ed vnit\u0159n\u00ed tahov\u00e9 nap\u011bt\u00ed ve struktu\u0159e skla. Pokud toto nap\u011bt\u00ed p\u0159ekro\u010d\u00ed pevnost materi\u00e1lu, m\u016f\u017ee se v\u00e1za rozb\u00edt bu\u010f b\u011bhem v\u00fdrobn\u00ed f\u00e1ze, nebo nakonec, kdy\u017e je p\u0159edm\u011bt vystaven vibrac\u00edm, teplotn\u00edm v\u00fdkyv\u016fm nebo lidsk\u00e9 manipulaci.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t

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5.4 Jak mohou v\u00fdrobci zabr\u00e1nit prask\u00e1n\u00ed sklen\u011bn\u00fdch v\u00e1z b\u011bhem \u017e\u00edh\u00e1n\u00ed?<\/h3>\t\t\t\t<\/div>\n\t\t\t\t
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Aby se zabr\u00e1nilo prask\u00e1n\u00ed b\u011bhem \u017e\u00edh\u00e1n\u00ed, v\u00fdrobci udr\u017euj\u00ed v peci konstantn\u00ed teplotu, upravuj\u00ed chladic\u00ed k\u0159ivky v z\u00e1vislosti na geometrii a tlou\u0161\u0165ce st\u011bny v\u00fdrobku, omezuj\u00ed proud\u011bn\u00ed vzduchu, aby se zabr\u00e1nilo nerovnom\u011brn\u00e9mu chlazen\u00ed, a prov\u00e1d\u011bj\u00ed kontroly nap\u011bt\u00ed pomoc\u00ed polaroskopick\u00fdch test\u016f.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t

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5.5 Co znamen\u00e1 \u0159\u00edzen\u00e9 chlazen\u00ed ve v\u00fdrob\u011b skla?<\/h3>\t\t\t\t<\/div>\n\t\t\t\t
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Proces, p\u0159i kter\u00e9m se teplota postupn\u011b sni\u017euje po \u017e\u00edh\u00e1n\u00ed, se naz\u00fdv\u00e1 \u0159\u00edzen\u00e9 chlazen\u00ed, p\u0159i kter\u00e9m sklen\u011bn\u00e9 v\u00fdrobky pomalu proch\u00e1zej\u00ed bodem deformace. T\u00edmto procesem se odstra\u0148uj\u00ed vnit\u0159n\u00ed gradienty nap\u011bt\u00ed a v\u00fdrazn\u011b se sni\u017euje pravd\u011bpodobnost spont\u00e1nn\u00edho prask\u00e1n\u00ed nebo struktur\u00e1ln\u00edho oslaben\u00ed.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t

\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\"\u017e\u00edh\u00e1n\u00ed\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t
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6. Z\u00e1v\u011bre\u010dn\u00e9 my\u0161lenky<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
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Um\u011bn\u00ed v\u00fdroby skla je sp\u00ed\u0161e \u010dek\u00e1n\u00ed ne\u017e sp\u011bch. F\u00e1ze tvarov\u00e1n\u00ed je zaj\u00edmav\u00e1, proto\u017ee d\u00e1v\u00e1 v\u00fdrobku tvar, ale tich\u00e1 \u017e\u00edhac\u00ed pec rozhoduje o tom, zda se dekorativn\u00ed v\u00e1za dostane z tov\u00e1rny k z\u00e1kazn\u00edkovi. Spole\u010dnosti, kter\u00e9 investuj\u00ed do stabiln\u00ed teploty pece, spr\u00e1vn\u00e9 k\u0159ivky ochlazov\u00e1n\u00ed a konzistence kontroly nap\u011bt\u00ed, pravd\u011bpodobn\u011b vyr\u00e1b\u011bj\u00ed sklo, kter\u00e9 vydr\u017e\u00ed roky. Sp\u011b\u0161n\u00ed z\u00e1kazn\u00edci obvykle zji\u0161\u0165uj\u00ed, \u017ee i ty nejkr\u00e1sn\u011bj\u0161\u00ed designy v\u00e1z nedok\u00e1\u017eou odolat nam\u00e1h\u00e1n\u00ed, kter\u00e9 je uvnit\u0159 \u0161patn\u011b \u017e\u00edhan\u00e9ho skla neviditeln\u00e9.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>","protected":false},"excerpt":{"rendered":"

Odborn\u00fd pr\u016fvodce \u017e\u00edh\u00e1n\u00edm sklen\u011bn\u00fdch v\u00e1z, vysv\u011btluj\u00edc\u00ed teploty, chladic\u00ed k\u0159ivky a v\u00fdrobn\u00ed postupy, kter\u00e9 zabra\u0148uj\u00ed prask\u00e1n\u00ed b\u011bhem v\u00fdroby skla.<\/p>","protected":false},"author":3,"featured_media":4730,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[1,58],"tags":[],"class_list":["post-4723","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","category-blogs"],"jetpack_featured_media_url":"https:\/\/mostebglass.com\/wp-content\/uploads\/2026\/03\/annealing-glass-vases-01.webp","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/mostebglass.com\/cs\/wp-json\/wp\/v2\/posts\/4723","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/mostebglass.com\/cs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/mostebglass.com\/cs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/mostebglass.com\/cs\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/mostebglass.com\/cs\/wp-json\/wp\/v2\/comments?post=4723"}],"version-history":[{"count":5,"href":"https:\/\/mostebglass.com\/cs\/wp-json\/wp\/v2\/posts\/4723\/revisions"}],"predecessor-version":[{"id":4733,"href":"https:\/\/mostebglass.com\/cs\/wp-json\/wp\/v2\/posts\/4723\/revisions\/4733"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/mostebglass.com\/cs\/wp-json\/wp\/v2\/media\/4730"}],"wp:attachment":[{"href":"https:\/\/mostebglass.com\/cs\/wp-json\/wp\/v2\/media?parent=4723"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/mostebglass.com\/cs\/wp-json\/wp\/v2\/categories?post=4723"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/mostebglass.com\/cs\/wp-json\/wp\/v2\/tags?post=4723"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}