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Τα καλύτερα... / Προστασία κιθάρας από υγρασία-θερμοκρασία
« στις: 30/12/03, 18:48 »
Μεταφέρω από το αντίστοιχο site της Larrivee. Δυστυχώς στα αγγλικά, αλλά πολύ χρήσιμα....
Humidity
Protecting Your Guitar from High Relative Humidity
It is extremely important to keep your guitar stored only in environments with measurable humidity of 60% or less, consistent with the conditions in which they are built. When relative humidity exceeds 60%, the wood may begin to expand. The most common symptoms of this phenomenon are as follows:
Top swells: With high humidity, the top will begin to swell, which appears as a distortion or "rippling" in the finish, visible on the top and/or back of the instrument. This is especially noticeable on cutaway models. A rise in the string action usually follows, which can adversely affect playability.
Top bellying: Excess humidity can cause the top of the guitar to "belly", consequently pushing the bridge and strings upwards relative to the neck. As the back expands the neck is pushed upwards. This problem may be further intensified by expansion of the ebony fretboard, which can cause frets to loosen. Frets are tight when fitted, which serves the function of keeping the neck flat. If they become loose, gaps in the slots allow the neck to bow upwards from the middle, causing the string height to increase to an even greater degree.
Glued joints: Excess humidity can cause all glued joints to become much more visible. In addition, pearl is impervious to changes in humidity, but the wood in which the pearl is inlaid is not and will swell with the introduction of high relative humidity. As the wood continues to swell a line (or gap) surrounding the inlay may appear.
Distortions in finish: Finish will not stop moisture from entering the wood (although it may slow it down). With longer exposure to higher relative humidity, the finish may become distorted. Small ridges may appear on the top, and the back and sides will appear "porous". As the wood expands these pores enlarge allowing the finish to sink deeper into the wood.
Sound quality: Tone quality tends to diminish as the instrument undergoes structural distortion from excess humidity, coupled with a decrease in string life and a general loss of appeal for the guitar.
Most problems associated with limited exposure to high relative humidity should correct themselves when the instrument returns to a normal range of humidity: 40% to 50% relative to 24°C.
The above problems can be avoided by taking a few simple precautions:
Recognize the symptoms described above, and if encountered, ensure that the guitar is moved to a safer storage environment.
Never keep your guitar in a dark cool basement during periods of high humidity. Excessive moisture will accumulate inside the case.
Keep your guitar on a stand as it allows air to circulate around it. If possible, it is a good idea to keep your guitar on the second or third level of your house when weather is warm.
Humidity
Protecting Your Guitar from High Relative Humidity
It is extremely important to keep your guitar stored only in environments with measurable humidity of 60% or less, consistent with the conditions in which they are built. When relative humidity exceeds 60%, the wood may begin to expand. The most common symptoms of this phenomenon are as follows:
Top swells: With high humidity, the top will begin to swell, which appears as a distortion or "rippling" in the finish, visible on the top and/or back of the instrument. This is especially noticeable on cutaway models. A rise in the string action usually follows, which can adversely affect playability.
Top bellying: Excess humidity can cause the top of the guitar to "belly", consequently pushing the bridge and strings upwards relative to the neck. As the back expands the neck is pushed upwards. This problem may be further intensified by expansion of the ebony fretboard, which can cause frets to loosen. Frets are tight when fitted, which serves the function of keeping the neck flat. If they become loose, gaps in the slots allow the neck to bow upwards from the middle, causing the string height to increase to an even greater degree.
Glued joints: Excess humidity can cause all glued joints to become much more visible. In addition, pearl is impervious to changes in humidity, but the wood in which the pearl is inlaid is not and will swell with the introduction of high relative humidity. As the wood continues to swell a line (or gap) surrounding the inlay may appear.
Distortions in finish: Finish will not stop moisture from entering the wood (although it may slow it down). With longer exposure to higher relative humidity, the finish may become distorted. Small ridges may appear on the top, and the back and sides will appear "porous". As the wood expands these pores enlarge allowing the finish to sink deeper into the wood.
Sound quality: Tone quality tends to diminish as the instrument undergoes structural distortion from excess humidity, coupled with a decrease in string life and a general loss of appeal for the guitar.
Most problems associated with limited exposure to high relative humidity should correct themselves when the instrument returns to a normal range of humidity: 40% to 50% relative to 24°C.
The above problems can be avoided by taking a few simple precautions:
Recognize the symptoms described above, and if encountered, ensure that the guitar is moved to a safer storage environment.
Never keep your guitar in a dark cool basement during periods of high humidity. Excessive moisture will accumulate inside the case.
Keep your guitar on a stand as it allows air to circulate around it. If possible, it is a good idea to keep your guitar on the second or third level of your house when weather is warm.
