Iti poti imagina sa innoptezi in cort ori sub cerul liber fara sac de dormit cu puf?
Tocmai am mentionat unul din cele mai necesare echipamente de calatorie pentru spiritele aventuroase. Vorbim despre un accesoriu care ar trebui sa fie mereu prezent in rucsac in timpul camparilor, expeditiilor, escaladelor, excursiilor de mai multe zile si nu numai.
Ce functie indeplineste sacul de dormit?
Cine a petrecut macar o noapte in mijlocul naturii, intelege exact cat de mult conteaza sa detina un sac de dormit de calitate. Probabil multi cred ca acest accesoriu este destinat unui public destul de limitat ca numar.
Insa nu trebuie sa fii un impatimit de excursii montane si de camping pentru a avea unul. Gandeste-te ca urmeaza sa-ti petreci noaptea intr-un ambient putin incalzit si umed ori ca nu dispui de o lenjerie pentru pat.
In orice imprejurare similara, sacul de dormit te poate scuti de experimentarea unor conditii mai putin placute. Practic, te va proteja de frig. Si este impropriu spus ca te incalzeste, deoarece nu produce caldura, ci impiedica pierderea caldurii generate de corp.
Pe de alta parte, ridica nivelul de confort si din punct de vedere igienic. Spre exemplu, daca poposesti intr-unul dintre refugiile montane sau intr-un hostel, unde conditiile nu sunt dintre cele mai primitoare, un astfel de accesoriu este intotdeauna binevenit.
Dar la fel ca in cazul altor echipamente de munte, nu toate modelele sunt caracterizate de aceleasi proprietati. Elementele care fac diferenta se refera in primul rand la materialele folosite de producatori pentru umplutura (sintetica sau cu puf).
Sac de dormit cu puf de gasca/rata sau cu umplutura sintetica?
Exista mai multe criterii de clasificare a sacilor de dormit: forma, dimensiuni, umplutura, etc. Dar azi ne vom concentra pe factorul umplutura. Tinand cont de acest element, magazinele cu echipament de munte propun in principal 2 categorii:
- Cu puf natural, de gasca sau rata;
- Cu fibre sintetice.
Chiar daca ambele variante se prezinta foarte bine in conditii de umiditate si de temperaturi scazute, intre ele exista deosebiri majore, ce nu se refera doar la pret. In mod categoric, variantele cu puf natural au preturi mai mari.
Sac de dormit cu puf natural – Pro si contro
Cu greu poate spune cineva ca sacul cu puf de gasca/rata este cel mai bun. Depinde de imprejurari si la fel ca orice alt produs, are avantaje si dezavantaje:
- Are greutate redusa cu o excelenta putere de izolatie;
- Este foarte moale si in raport cu greutatea, garanteaza cel mai bun confort termic;
- Confera in scurt timp senzatia de caldura (se creeaza un microclimat);
- Prin cantitatea de aer retinuta in umplutura, ofera o temperatura omogena;
- Ocupa mai putin spatiu, fiind versiunea cea mai compacta;
- Intretinut corespunzator, are o durata de viata de 15-20 de ani;
- Umplutura permite o foarte buna respirabilitate in timpul somnului;
- Puful reprezinta un inamic natural al acarienilor (recomandat in caz de alergii);
- Modelele de ultima generatie sunt tratate sa reziste si la umezeala.
- Are un pret mai ridicat comparativ cu cealalta categorie;
- Puful se impregneaza daca se expune la lichide si umezeala;
- Odata ce se uda complet, isi pierde in mare parte puterea izolanta;
- Daca se rupe, puful tinde sa iasa din captuseala.
- Devine cea mai inteligenta alegere pentru cine urmareste sa obtina cea mai buna putere termoizolanta;
- Optiunea este indicata pentru utilizarile de iarna, la altitudini inalte, in conditii de temperaturi rigide;
- Se recomanda si celor care doresc sa investeasca intr-un produs superior calitativ, garantat sa dureze.
Sac de dormit cu umplutura sintetica – Pro si contro
Daca este bun sa nu, ramane sa decizi dupa ce vei descoperi cateva dintre punctele forte, respectiv slabe:
- Are o tinuta excelenta in conditii climatice vitrege (umezeala, precipitatii);
- Daca se uda, isi pastreaza in mare parte capacitatea sa izoleze termic;
- Se usuca usor (fibrele sintetice se impregneaza de umezeala mai putin);
- Devine o optima solutie in cazul alergiilor la puful natural;
- Se intretine destul de usor, umplutura fiind mai putin sensibila la murdarie;
- Daca se taie sau se rupe, fibrele sintetice nu ies din sacul de dormit;
- Este mai voluminos, ocupand mai mult spatiu in bagaj;
- Ofera un confort termic mai redus, sesizabil in special la temperaturi scazute, comparabil cu aceeasi temperatura de confort la sacii cu puf natural;
- Pentru a crea un microclimat confortabil, este nevoie de mai mult timp;
- Avand o compozitie sintetica, are o greutate mai mare;
- Are o durata de viata inferioara (fibrele sintetice se deterioreaza mai usor).
- Fibrele sintetice sunt recomandate la sacii potriviti pentru sezonul cald, pentru utilizarile mai putin frecvente si in conditii climatice mai putin rigide;
- Reprezinta o solutie pentru cine nu cauta neaparat caracteristici de top, dispun de un buget mai restrans sau doresc utilizarea fara griji atat timp cat sacul performeaza dupa care il schimba.
Cum se evalueaza calitatea umpluturii cu puf?
In general, asa cum bine ai inteles, puful este sinonim cu performanta si cu utilizarile intr-un cadru climatic destul de auster. Insa nu inseamna ca orice sac de dormit cu puf este inzestrat cu aceleasi capacitati izolante. Totul depinde de calitatea umpluturii, data de:
- Tipul de puf;
Dar sa le luam pe rand:
Tipul de puf
Producatorii folosesc atat puful de rata, cat si de gasca. Acesta din urma este mai costisitor, insa are o calitate superioara. Practic, reuseste sa pastreze mai bine caldura, pe o durata mai lunga, echivalentul unui confort termic sporit.
Un alt factor decisiv se refera la originea materiei prime. In mod evident, puful pasarilor originare din regiunile cu un climat polar (Europa de Nord, Siberia, Groenlanda, Canada) este mai apreciat (mai moale, mai gros, mai calduros).
Acest factor descrie puritatea umpluturii si indica gradul de repartizare al pufului comparativ cu penele (90 / 10, 80 / 20, etc.). Puful este mai calduros si totodata mai apreciat decat penele. Cu cat valoarea numerica a primului termen este mai mare, cu atat umplutura are o calitate mai buna. Totusi, penele sunt absolut necesare pentru a crea ochiurile de aer in umplutura, ochiuri care inmagaziceaza caldura si o pastreaza pentru a-ti oferi confortul promis.
Cum se masoara calitatea pufului?
Pe scurt, calitatea umpluturii si totodata a sacului este data de capacitatea acestuia de a inmagazina aerul cald si de a se umfla. Acest parametru, cunoscut si cu denumirea de filling power se masoara in CUIN (cubic inch per ounce).
Este vorba despre un indicator care exprima raportul dintre volum si greutate. Cu cat raportul are o valoare mai ridicata, cu atat calitatea va fi si ea mai mare.
Practic, cu cat puful este mai voluminos, cu atat cantitatea necesara pentru umplerea sacului va fi mai scazuta (volum mare, greutate mica).
- Spre exemplu, un sac de dormit de o calitate superioara inseamna minim 550 CUIN. Iar continutul de puf va avea un raport de 90 / 10 (aproximativ 90 % puf si 10 % alte fibre);
- Puful cu valoarea de 700 CUIN va fi intotdeauna mai calduros, mai comprimabil si va cantari mai putin decat cel de 500 CUIN;
- Pentru un produs de utilizat in 3 sezoane, indiferent de calitatea umpluturii, greutatea nu trebuie sa fie mai mica de 500-600 de grame;
- Daca nu vei face expeditii in zonele arctice sau pe cele mai inalte varfuri din lume, nu trebuie sa exagerezi. O valoare in jurul a 600 CUIN este mai mult decat rezonabila.
Tinand cont de mai multe opinii, balanta tinde sa se incline spre modelele de sac de dormit cu puf natural. Insa acest lucru nu trebuie generalizat. Alegerile sunt conditionate de situatiile in care urmeaza sa fie intrebuintat (mediu uscat / umed) si de temperaturile ce caracterizeaza ambientul respectiv.
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