EP3398189A1 - Procédé d'amélioration des propriétés acoustiques d'un bois d'épicéa à instruments - Google Patents

Procédé d'amélioration des propriétés acoustiques d'un bois d'épicéa à instruments

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Publication number
EP3398189A1
EP3398189A1 EP16829090.6A EP16829090A EP3398189A1 EP 3398189 A1 EP3398189 A1 EP 3398189A1 EP 16829090 A EP16829090 A EP 16829090A EP 3398189 A1 EP3398189 A1 EP 3398189A1
Authority
EP
European Patent Office
Prior art keywords
wood
sound
spruce
liquid medium
vitreus
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP16829090.6A
Other languages
German (de)
English (en)
Other versions
EP3398189B1 (fr
Inventor
Francis Schwarze
Markus HEEB
Marjan GILANI
Sébastien Josset
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Eidgenoessische Materialprufungs und Forschungsanstalt EMPA
Original Assignee
Eidgenoessische Materialprufungs und Forschungsanstalt EMPA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Priority claimed from EP16164755.7A external-priority patent/EP3232432A1/fr
Application filed by Eidgenoessische Materialprufungs und Forschungsanstalt EMPA filed Critical Eidgenoessische Materialprufungs und Forschungsanstalt EMPA
Publication of EP3398189A1 publication Critical patent/EP3398189A1/fr
Application granted granted Critical
Publication of EP3398189B1 publication Critical patent/EP3398189B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10D—STRINGED MUSICAL INSTRUMENTS; WIND MUSICAL INSTRUMENTS; ACCORDIONS OR CONCERTINAS; PERCUSSION MUSICAL INSTRUMENTS; AEOLIAN HARPS; SINGING-FLAME MUSICAL INSTRUMENTS; MUSICAL INSTRUMENTS NOT OTHERWISE PROVIDED FOR
    • G10D3/00—Details of, or accessories for, stringed musical instruments, e.g. slide-bars
    • G10D3/22—Material for manufacturing stringed musical instruments; Treatment of the material

Definitions

  • the invention relates to a method for improving the acoustic properties of spruce tonewood for musical instruments. Furthermore, the invention relates to an improved spruce-tonewood for musical instruments, and musical instruments, in particular stringed instruments whose resonance panels consist of such spruce-Klangholz.
  • Sound wood for musical instruments should be as light as possible, but at the same time have a high modulus of elasticity (modulus of elasticity or Young's modulus) and a high speed of sound. It should also be free of knots and have narrow, homogeneous tree rings and a low proportion of latewood ( ⁇ 20%). Only a few, carefully selected wood assortments meet these strict quality criteria.
  • the (acoustic) material quality of sound wood is generally defined by the quotient c / p, where c is the speed of sound and p is the density of the sound wood (Ono & Norimoto, 1983; 1984; Spycher, 2008; Spycher et al., 2008; Tab. 4).
  • the speed of sound is the square root of the ratio of modulus of elasticity (for bending longitudinally to the fiber) to density.
  • the modulus of elasticity is a material-independent material value; the product of modulus of elasticity and area moment of inertia gives the flexural rigidity of the workpiece (Ono & Norimoto, 1983; 1984; Spycher, 2008; Spycher et al., 2008).
  • the speed of sound eg of spruce wood
  • the speed of sound is 4800 to 6200 m / s, the average bulk density 320 to 420 kg / m 3 .
  • Both parameters are dependent on the moisture content of the wood, which increases the precision and infrastructure requirements for the experiments as well as the evaluation of the test results.
  • Of particular interest in all measures to improve material quality is the impact relative changes in modulus and bulk density have on the speed of sound.
  • the modulus of elasticity (in%) changes approximately in proportion to the change in the bulk density (in%), the speed of sound remains approximately the same (the material quality then increases approximately inversely proportional to a reduction in the apparent density); such a ratio of relative changes in modulus of elasticity and bulk density is said to be "narrow" (Ono & Norimoto, 1983; 1984; Spycher, 2008; Spycher et al., 2008). in%) much less than the bulk density (in%), the speed of sound is increased (the quality of the material then increases more than inversely proportional to a decrease in bulk density.)
  • Such a ratio of relative changes in Young's modulus and bulk density is considered “wide”. or "large” and is highly desirable for achieving a high material quality of tonewood (Schleske, 1998; Wegst, 2006), but sound wood with a broad modulus of bulk density is rare in nature and therefore expensive (Bond, 1976) ;
  • a disadvantage of the methods described so far is that a uniform settlement of the wood by the selected fungi can not be guaranteed.
  • An irregular settlement has the consequence that the acoustic material quality is improved only inconsistently or even not at all.
  • it entails the risk of undesirable strength losses, cracks and crevices in the wood.
  • Physisporinus vitreus has low levels of competition against other species of fungi and is therefore very susceptible to contamination by other species.
  • Wood Sei Technol 46,769-779 describes a method for the automatic visualization and quantification of microscopic cell wall elements of spruce wood, which is also able to show the changes caused by Physisporinus vitreus.
  • WO2012 / 056109 A2 describes the use of plant-derived nanofibrillated cellulose in the form of a hydrogel or a membrane as a carrier material for various types of cell cultures. Presentation of the invention
  • the object of the invention is to provide an improved method for producing spruce tonewood for musical instruments, which ensures in particular an improvement in the acoustic properties, a shorter process time and a more homogeneous product.
  • Other objects of the invention are to provide an improved sound wood for musical instruments, as well as musical instruments made thereof.
  • a wood sound ingot is subjected to Physisporin vitreus treatment under controlled, sterile conditions.
  • the previously sterilized soundwood blank is dipped in a liquid medium enriched with fungus mycelium and kept therein with exclusion of light during a contact time and finally sterilized.
  • the liquid medium contains nano-fibrillated cellulose (NFC) in a proportion of 200 to 300 g per liter.
  • NFC nano-fibrillated cellulose
  • Controlled, sterile conditions in the present context means an environment in which at least the temperature and the relative humidity are kept within a predefined range and contamination with foreign fungal species is prevented. According to the invention, a temperature of 18 to 26 Q C and a relative humidity of about 60 to about 80% is set.
  • the initial sterilization and subsequent treatment with Physisporinus vitreus under sterile conditions in a suitable incubation container ensures that the process is not affected by contamination. With the final sterilization the effect of Physisporinus vitreus is stopped in a controlled way.
  • the liquid medium contains nanofibrillated cellulose (NFC) in a proportion of 200 to 300 g per liter, a significantly improved efficiency of the process is achieved, which thus runs much faster and more homogeneous.
  • NFC nanofibrillated cellulose
  • a sound wood blank is generally a plate-shaped portion of a suitable sound wood to understand, which is intended in particular for the production of the ceiling or the bottom of a string or plucked instrument. In the present context, it is without exception spruce wood.
  • a closable medium-tight container made of sterilizable materials, for example, from an autoclavable plastic is generally suitable.
  • the container must be equipped so that inside a controlled atmosphere of predetermined humidity is adjustable. For the controlled supply of air at least one designed with a sterile microfilter valve is provided.
  • a liquid medium enriched with fungal mycelium is understood in a manner known per se to be a buffered aqueous solution with nutrients, which has been mixed with mycelium samples of a pure culture of Physisporinus vitreus and then grown for a suitable time.
  • the liquid medium contains from 200 to 300 g of nanofibrillated cellulose (NFC) per liter of liquid medium.
  • NFC nanofibrillated cellulose
  • the term "nanofibrillated cellulose”, also abbreviated “NFC” includes cellulose fibers having a diameter of about 3 nm to about 200 nm and a length of at least 500 nm and an aspect ratio (length: diameter) of at least 100 ⁇ m understand.
  • the NFC fibers have a diameter of 10 to 100 nm, on average 50 nm and a length of at least a few micrometers, and the aspect ratio may also be 1 ⁇ 00 or more.
  • NFC is generally obtained by a mechanical comminuting process of wood and other vegetable fibers; first descriptions go to Herrick et al. (Herrick, FW; Casebier, RL; Hamilton, JK; Sandberg, KR Microfibrillated cellulose: Morphology and accessibility J. Appl Polym., Appl. Polym., Symp., 1983, 37, 797-813) and Turback et al. (Turbak, AF; Snyder, FW; Sandberg, KR Microfibrillated cellulose, a new cellulose product: Properties, uses, and commercial potential. J. Appl. Polym. Be. Appl. Polym. Symp. 1983, 37, 815-827) in 1983.
  • MFC microfibrillated cellulose
  • CNF cellulose nanofibers
  • NFC nanofibrillated cellulose
  • cellulose nano- or microfibrils are commonly used.
  • cellulose nanofibers are long and flexible.
  • the NFC formed therefrom typically contains crystalline and amorphous domains and exhibits a network structure due to strong hydrogen bonds (see, eg, Lu, J .; Askeland, P., Drzal, LT.) Surface modification of microfibrillated cellulose for epoxy composite applications Zimmermann, T., Pöhler, E., Geiger, T. Cellulose fibrils for polymer reinforcement, Adv. Eng. Mat., 2004, 6, 754-761, Iwamoto, S .;
  • the method according to the invention can in principle be carried out with a single sound wood blank. As a rule, however, for the sake of efficiency alone, several chopped wood blanks are treated simultaneously.
  • the incubation container is expediently equipped with corresponding recesses and support elements.
  • the method can be carried out in particular with two sound wood blanks, which together form a cover for a violin.
  • a temperature of about 22 Q C in particular in the range of 21 Q C to 23 Q C, and a relative humidity of about 70%, in particular in the range of 65 to about 75% set (claim 3).
  • the exposure time is preferably selected such that the following strength values of the sound wood are fulfilled (claim 4):
  • Module for bending longitudinally to the fiber at least 7 GPa, preferably at least 10 GPa;
  • Compressive strength along the fiber at least 24 N / mm 2 , preferably at least 34 N / mm 2 ;
  • the measures according to the invention make it possible to produce tonewood having outstanding properties using a comparatively short exposure time of 4 to 6 months (claim 5).
  • the liquid medium used for the process according to the invention is preferably obtained by incubation of an NFC-containing nutrient medium inoculated with Physisporinus vitreus under controlled pH conditions (claim 6).
  • an aqueous nutrient medium with spruce wood extract and nanofibrillated cellulose is initially introduced and inoculated with a mushroom-containing liquid medium culture or with mushroom-covered sawdust particles.
  • the sterilization of the sound wood blank to be carried out after the exposure time of several months can in principle be carried out in a known manner.
  • ethylene oxide is used for this purpose (claim 7).
  • a color change of the wood is advantageously effected, which is characterized by a defined in the color space (L * , a * , b * ) color difference ⁇ * of at least 1 1 (claim 9).
  • the spruce tonewood for musical instruments produced by the method according to the invention is distinguished in that the sound radiation in the longitudinal direction is increased by at least 20%, preferably by at least 24%, compared to untreated sound wood and the attenuation in Longitudinal therapies by at least 25%, preferably increased by at least 29%.
  • the longitudinal direction corresponds to the direction of tree growth, while the radial and tangential directions refer to the approximately circular tree rings.
  • Yet another aspect of the invention relates to a musical instrument, in particular a stringed instrument, with at least one soundboard made of tonewood improved according to the invention.
  • musical instrument is to be understood in the widest sense; In particular, such resonant plates can also be used for wooden membranes in loudspeakers.
  • Fig. 1 gel electrophoretic separation of the RAPD fragments using primer 08/9328; samples are labeled with assays (Table 1); negative control (no template DNA) is designated N; the DNA molecular weight marker used was a 100 bp ladder (M); Fig. 2 Mass losses in wood samples after 12 months of incubation with Physi- vitus vitreus: bulk density p R (bars) and mass loss Am (line with squares) for three different types of wood; Fig. 3 (a) Example of the relaxation of stress (stress) ⁇ in the wood as a function of time; (b) taking a wood sample before and after the microbending load;
  • a clone-specific primer was designed and synthesized. This can be done in a real-time
  • strain-specific primers were constructed for the clear detection of the fungus P. vitreus.
  • Table 1 lists the types of fungi used in these studies. DNA extraction for the molecular biological studies was carried out using the Extract-N-Amp TM Plant PCR Kit from Sigma Aldrich according to the manufacturer's instructions. Table 1: Fungus species used
  • RAPD Randomly Amplified Polymorphic DNA
  • ITS 1 / ITS 4 primer combination of White et al. (1990) amplified the ITS1 -5,8S-ITS2 region of the fungal species used with a thermocycler of the company Biometra.
  • Target region of the primers used was the ribosomal DNA (rDNA). It consists, inter alia, of coding gene segments 18S, 5.8S and 28S rRNA (in fungi and other eukaryotes) that are conservative (Schmidt and Moreth, 2006). These three coding gene segments are separated by highly variable introns, the Internal Transcribed Spasers (ITS1 and ITS2).
  • the resulting PCR products were then commercially purified and sequenced (Synergene, Zurich).
  • the sequence of the ITS region of P. vitreus 642 has been deposited in the international database EMBL (Accession No. FM202494). Due to the species specificity of the ITS domain, the sequence of P. vitreus 642 was used to evaluate, using the Clustal X program and the Basic Local Alignment Search Tool (Primer BLAST) of the National Center for Biotechnology Information (NCBI).
  • Physisporinus vitreus (EMPA strain No. 642 or 643) was pre-cultured on a suitable, sterile malt agar medium in Petri dishes (0 9 cm). As soon as the culture medium was completely overgrown by the fungus mycelium of P. vitreus (after approx. 12-16 days), approx. 2g of sterile spruce sawdust (particle size ⁇ 2mm) was placed in the middle of the medium in each Petri dish under sterile conditions. After a further 4 to 6 weeks, the sawdust substrate, completely mixed by P. vitreus, was used to inoculate the liquid medium. 1. 1 nutrient composition
  • a nanofibrillated cellulosic nutrient medium has proved to be a particularly suitable liquid medium for the cultivation of P. vitreus on the basis of preliminary experiments.
  • the nanofibrillated cellulose-containing liquid medium was incubated under sterile conditions with P. vitreus in a bioreactor under controlled pH conditions (pH adjusted to 6.8 - 7.2 or optionally under controlled oxygen supply). The speed of the agitator was set low.
  • the culture medium can also be used as a standing or shaking culture in suitable Erlenmeyer flasks with cotton stoppers on a horizontal shaker (50 rpm) for 4 to 8 weeks in a climatic chamber in the dark at 22 ° C. and 70 ⁇ 5% rel. Humidity can be produced. 3. Mushroom treatment of spruce wood
  • the introduction of the mushroom-containing liquid medium and the actual exposure time or fungus treatment of the spruce was carried out under sterile conditions in a specially prepared incubator.
  • the incubator consists of a heat-resistant plastic container (PPC) with internal dimensions of 554 mm x 354 mm x 141 mm (source: WEZ Kunststoffwerk AG, CH-5036 Oberentfelden, item no. 6413.007) and a matching, modified lid with sight glass.
  • PPC heat-resistant plastic container
  • In this incubator were two in their dimensions and shape of the treated sound wood blanks (violet corners) adapted stainless steel treatment tanks and fitting recessed holders (Avemlagervorraumen), each with a corresponding filler pipe with 3 to 4 outlet openings, which within the incubator with a hose system ( made of heat-resistant material) and an inlet valve are connected.
  • the mushroom-containing liquid medium can be filled into the incubator under sterile conditions.
  • the two tonewood blanks to be treated (for a violin corner) are placed in the appropriate support devices in stainless steel treatment tanks.
  • the total amount of the mushroom-containing liquid medium required later for filling can be reduced by optionally filling a few glass beads as placeholders (volume displacer) in the lower area of the treatment tank.
  • the filling hoses were connected to the filling valves within the incubator container.
  • the incubator was tightly closed with the lids (with sight glass) and the entire container, including the sound wood blanks placed therein, under low heat, e.g. Sterilized with ionizing radiation.
  • a 10% negative pressure approximately 100 mbar
  • the supply line was stopped and the supply hoses emptied.
  • the incubator was then vented to normal pressure with a sterile microfiltered valve and incubated as a whole for the intended fungal treatment (exposure time) in a suitable air conditioning cabin.
  • the incubator with the wood samples surrounded therein by the fungus-containing, nanofibrillated cellulose-containing liquid medium was incubated for the required contact time (fungus treatment) in a suitable air conditioning cabin at 22 ° C. (and 70 ⁇ 5% relative humidity). F.) for 12 months.
  • fresh, oxygen-rich air was supplied under sterile conditions through the valve with the sterile microfilter.
  • the wood samples were cleaned and then sterilized with ethylene oxide. From each sample variant, a minimum of 5 replicates were tested in a micromechanical instrument to determine stress relaxation. Subsequently, the samples were analyzed by Fourier Transform Infrared Spectrometer (FT-IR) and Dynamic Water Vapor Sorption (DVS). 4. Removal and aftertreatment of the modified wood
  • the incubator is opened.
  • the fungus-treated wood samples lying in the treatment container were removed from the nanofibrillated cellulosic liquid medium completely grown by the fungus mycelium and carefully (with a metal spatula) carefully cleaned of superficially adherent mycelium.
  • the freshly picked, mushroom-modified wood chippings have a relatively high water content of z.T. more than 150 to 250% and must then be gently dried to avoid cracking (ring peeling).
  • the spruce boards store only in a climatic chamber (20 ' ⁇ ) and 80% rel. Moisture (possibly before in a container with a xylolonnen atmosphere to prevent mold fungus growth) and then over a period of several weeks successively in a climatic chamber at 65% and later at 50% rel. Damp dried down.
  • the apparent density p R of the various wood samples before and after the fungus treatment is shown in FIG. 2.
  • the average weight loss on the fungal treated wood samples was 3.3% ⁇ 0.9%. From Fig. 2 it can be seen that with decreasing bulk density of the wood lower mass losses were recorded. In the high-quality sound wood (low bulk density) the highest, in the inferior wood (high bulk density), the lowest mass losses were recorded.
  • ⁇ 0 is the initial voltage and o t is the voltage after 120 seconds of relaxation.
  • the most important acoustic properties that are used for the selection of sound wood for musical instruments are the damping (tanö) and the sound radiation (R).
  • High-quality sound wood has a high sound radiation (R).
  • R describes how strongly the vibrations of a body are damped due to the sound radiation.
  • the attenuation of sound refers to any kind of reduction of the sound intensity that does not necessarily have to do with a reduction of the sound energy, for example by divergence, ie by distributing the sound energy over a larger area.
  • Both properties were examined on untreated controls and on fungal treated wood. The vibration characteristics of wood samples were measured before and after fungal treatment (as described under 5.4) at a relative moisture content of 65%. The results show that both the sound radiation and the attenuation in the fungus-treated wood increase significantly (FIGS. 5-6).
  • the color measurements were made on wood samples with a tristimulus colorimeter (Konica Minolta) at wavelengths between 360-740 nm.
  • the device allows the non-contact measurement of brightness and color at a measuring angle of 1 °.
  • the color coordinates were determined for fungus-treated and freshly beaten wood and the color index was calculated as follows:
  • E * V (L * ) 2 + (a * ) 2 + (b * ) 2
  • L * defines the brightness from 0 (black) to 100 (white) while a * defines the ratio of red (+60) to green (-60) and b * the ratio of yellow (+60) to blue (-60) specify.
  • E * which by definition is the length of a vector in the color space spanned by L * , a * and b * Change vector ⁇ * , which connects the color point (L 0 * , a 0 * , b 0 * ) before color change with the color point (L, aA bi * ) after color change:
  • the size ⁇ * is also called the color difference.
  • FIG. 8 shows the time profile of the color difference ⁇ * of sound wood (open circles) and lumber (filled circles) after a different duration (4-12 months) of the fungus treatment compared to the untreated state.
  • the dashed line is the color difference an old wood sample (Rougemont) compared to a freshly cut sample of the same wood species shown.
  • C Ring vibration
  • the different composition of freshly cut wood has an influence on the interaction with moisture, eg sorption dynamics, moisture capacity and dimensional stability of the material.
  • moisture eg sorption dynamics, moisture capacity and dimensional stability of the material.
  • These changes will also have an impact on the wood anatomy and supermolecular structure of the cell walls, which in turn have a significant impact on the vibro-mechanical properties of the wood.
  • water molecules As water molecules enter the woody cell wall, they are taken up by the surfaces of the cellulosic microfibrils and the matrix consisting of lignin and hemicellulose.
  • the method of fungal wood modification described here leads to a temporal reduction of the stress relaxation of the material under various mechanical (eg tuning) and physical (eg air humidity fluctuations) boundary conditions, which is of crucial importance for the stability and sound quality of musical instruments made of wood.
  • the striking similarities between naturally aged and fungus treated wood show that the fungus treatment is a valuable wood modification process for the accelerated aging of tonewood.
  • the following a fungus-treated violin in a blind test at the Osnabrück Baumrius in 2009 is very likely due to the similarity of the mechanical and hygroscopic stability of mushroom-treated and old wood.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Chemical And Physical Treatments For Wood And The Like (AREA)
  • Stringed Musical Instruments (AREA)

Abstract

L'invention concerne un procédé d'amélioration des propriétés acoustiques d'un bois d'épicéa à instruments pour des instruments de musique. Selon le procédé, au moins une ébauche en bois à instruments est soumise à un traitement par Physisporinus vitreus dans des conditions stériles contrôlées. L'ébauche en bois à instruments préalablement stérilisée est immergée dans un milieu liquide enrichi en mycélium et y est maintenue dans le noir pendant un temps d'action et finalement stérilisée, une température de 18 à 26 °C et une humidité relative de l'air d'environ 60 à environ 80 % étant réglées pendant le temps d'action. Une amélioration, reproductible, uniforme et exempte de défauts locaux, des propriétés acoustiques du bois à instruments est garantie par le fait que le milieu liquide contient de la cellulose nanofibrillée (NFC) dans une proportion de 200 à 300 g par litre.
EP16829090.6A 2015-12-30 2016-12-28 Procédé destiné à l'amélioration des propriétés acoustiques du bois de résonance d'épicea Not-in-force EP3398189B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP15203220 2015-12-30
EP16164755.7A EP3232432A1 (fr) 2016-04-11 2016-04-11 Procédé destiné a l'amélioration des propriétés acoustiques du bois de résonance d'épicea
PCT/EP2016/082761 WO2017114856A1 (fr) 2015-12-30 2016-12-28 Procédé d'amélioration des propriétés acoustiques d'un bois d'épicéa à instruments

Publications (2)

Publication Number Publication Date
EP3398189A1 true EP3398189A1 (fr) 2018-11-07
EP3398189B1 EP3398189B1 (fr) 2019-10-30

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EP16829090.6A Not-in-force EP3398189B1 (fr) 2015-12-30 2016-12-28 Procédé destiné à l'amélioration des propriétés acoustiques du bois de résonance d'épicea

Country Status (5)

Country Link
US (1) US10388260B2 (fr)
EP (1) EP3398189B1 (fr)
JP (1) JP2019502165A (fr)
CN (1) CN108604441A (fr)
WO (1) WO2017114856A1 (fr)

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* Cited by examiner, † Cited by third party
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CN109732731B (zh) * 2018-12-18 2021-09-03 德丰桐声(北京)科技有限公司 发音板的制作方法
CN112345382A (zh) * 2020-11-03 2021-02-09 西北农林科技大学 一种热处理木材力学强度的检测方法

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6657113B2 (en) * 2002-01-30 2003-12-02 Alexander Béla Herman Molded fretboard and guitar
FR2863539B1 (fr) * 2003-12-10 2006-09-15 Henri Selmer Paris Procede de traitement de bois a porosite ouverte par polycondensation in situ de resines epoxy-amine
DE102005002366A1 (de) * 2005-01-18 2006-07-27 EMPA Eidgenössische Materialprüfungs-und Forschungsanstalt Verfahren und Mittel zur Verbesserung der Tränkmittelaufnahme und -verteilung in Hölzern
DE102005027424A1 (de) * 2005-06-14 2006-12-28 Martin Schleske Verfahren zur Verbesserung der akustischen Eigenschaften von Klangholz für Musikinstrumente
US7598444B2 (en) * 2007-07-10 2009-10-06 Farnell Jr Alfred D Molded stringed instrument body with wooden core
US20120070609A1 (en) * 2010-09-20 2012-03-22 Clayton Poppe Composite panel having bonded nonwoven and biodegradable resinous-fiber layers and method of construction thereof
FI123988B (fi) * 2010-10-27 2014-01-31 Upm Kymmene Corp Soluviljelymateriaali
CN203055418U (zh) * 2012-02-17 2013-07-10 赵振伟 一种有琴弦的乐器的音板
CN104261511B (zh) * 2014-10-13 2016-05-18 南京航空航天大学 夹心式物理杀菌装置

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Publication number Publication date
US10388260B2 (en) 2019-08-20
WO2017114856A1 (fr) 2017-07-06
JP2019502165A (ja) 2019-01-24
US20190088235A1 (en) 2019-03-21
CN108604441A (zh) 2018-09-28
EP3398189B1 (fr) 2019-10-30

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