Questo è quello che la gente fraintende.
https://knifesteelnerds.com/2021/01/11/ ... s-to-dull/
In pratica, la cattiva reputazione è legata alla
cattiva manutenzione.
... omissis ...
Long term study
Prior to publication of reference 1 the author had been using a Mach 3 cartridge for 10 months, shaving every other day for roughly 140 shaves employing the drying technique presented above. This cartridge has been examined in the optical microscope as described above with the following results: Figure 4 shows the edge of a blade after 140 shaves located away from chips. It may be compared to the new blade shown in Fig. 1. It is apparent that in these images of the blade edges, taken at a 90 degree angle to the blade surface, that there is no indication of wear of the old blade along its edge at locations away from microchips after 140 shaves.
Table 2 presents the data on the chip length from this study. One sees that the number of chips has increased from 12 in the short-term study to 43. Table 3 is presented to illustrate the distribution of chip length in the two studies. It is seen that in both studies the majority of chips have lengths between 7 and 51 microns. Interestingly, the number of chips on the leading blade was found to be significantly less than the middle and trailing blades in each study.
Summary and Conclusions
To estimate the loss of smoothness after each study the author shaved half of his face with a new cartridge blade and the other half with the old one. In the short-term study, he detected no loss of smoothness and in the long-term study only a very slight loss. The purpose of these studies was to determine if the microchipping discovered in ref. [2] was the cause of the perception on the web that cartridge blades needed to be replaced after 6 to 12 shaves. With properly cleaned blades chip formation only dulls the blades on that fraction of the blade where they have formed.
This study has shown that the microchipping predicted by [2] does occur during shaving with cartridge blades. However, it also shows that the fraction of the total blade length in the cartridge does not produce a significant loss of smoothness in cartridges that have chip fractions as high as 0.056 after 140 shaves. The study supports the hypothesis that the reason many men discard their cartridge blade after 1 to 2 weeks is because the cartridges are not properly cleaned after each shave and not because of microchip formation.
... omissis ...
Per evitare, basta applicare il
metodo Kneipp:
• acqua calda, per eliminare i residui di sapone
• acqua fredda, per eliminare i residui di calcare
• asciugare perfettamente
Ovviamente, ad ogni utilizzo.
Personalmente utilizzo anche una strategia per allungare ulteriormente la vita della cartuccia, arrivando ben oltre il risultato dello studio:
•
bagno d'olio di girasole, per lo stoccaggio a riposo
• lavaggio caldo, prima della rasatura per eliminare la copertura protettiva dell'olio
• trattamento Kneipp, dopo ogni utilizzo
• manutenzione delle lame, con 20 passaggi su
coramella in cuoio
• messa a riposo
Con questo metodo i risultati di durata sono incredibili.
http://www.ilrasoio.com/viewtopic.php?t=3712