DE1965381A1 - Membrane for acoustic instruments and process for their manufacture - Google Patents

Description

SA-5426

B e & c fa r ei bu η Ku of the patent application

the plrma

ΗΪΡΡΟΝ GAKKI SEIZO KABUSHIKI KAISHA, 10 «-t, Nakaaav / a-cho, Hatoainatsu-shi ₉ Shizu <*> ka <-ken, Japan

concerning

Membrane for SühaXlin instruments and methods of making them

The present invention relates to a membrane for a sound instrument, the membrane being made of foamed synthetic resin is made.

Xm general IFLT bü essential since £ auo a membrane for Schallinstruroente a Matejcial iat prepared _5, the specific requirements, such as low specific Sawicht, high Koung's' modulus and a relatively high internal loss corresponds to Bind membranes Previously often ou "(treated") special paper prepared "but they do not meet all such requirements. Recently one has gone over to this, foamed synthetic resin, such as foamed * * polystyrene or foamed polyvinyl chloride «

00 9 829/10 8 9 $ A0 oniQf _NAL

use as a material for membranes au. Deraitiß «lumped Ayathotic resinous materialism fcis'vs ?! sin e very little specific? Weight and Onea Sölatlv raised internal loss, Eigeßseh * _t ifteü a membrane with good ir AbetrablwirkBamkait result, and wherein a high axtrea par tial resonance can be reduced. Hinau iroäf: nt _s that he sol membranes .laicht in any desired shape ago can "share, but hot daa geaehäumte ay material has a lower Xoung'a ^ module 30 that d 'i * worth quenaen ranging from high P ^^ It becomes clear, that is, it is about an “unwanted Sigetsao booklet.

Hun consists of a Verhalxaiq zv-'ischen your ioun. ^ ¹ ^ '-modu and the «peEifirjcheii Sev / iehtj, according to which the ¹ becomes austere -r ^ Y, if the letter' \ ^ r" i * ingt . is it Banach aröcisei unaögli: h, equilateral alia angegebiMiLV up to meet Arifoniei and infolgadeoaexi ea dfirfte hardly possible for a membrane & ln Schiillln "trument raifc ™ behavioral ago ^ uatellen?.

One has ready »üiiu * varbu ^ uerte membrane herge-ütsiifc, au · tin ·· XÖrper au · gt» * cblu »ten eynthefclechea hareertig ·» «· * · * 1β! In a film roa "yntheijiachtim Har" beöteht _v ^ n-lU "coating has been applied to the surface""holeί" now no fully satisfactory evgebiiiii-a could be evssiolt with this either.

009829 / 10ΙΘ BADORlGlNAi

A membrane made of foamed synthetic ciBchera hax'sa Another disadvantage of the material is a vexheltniauiüßig low mechanical strength and durability, and can be easily broken by vibration.

To get rid of the bad parts and a satisfactory one To achieve the behavior of a membrane for a sound instrument, the present invention provides the construction of a membrane for a Sohallinetruaent and a procedure for their Heratellation to. This improved ^ construction of a diaphragm contains an arrangement of foamed granules one thermoplastic resin and a binder layer bus " a thermosetting resinous filler, dae more or less fills the gaps between the foamed granulate and the grains together with formation a unified body in the form of the membrane " The method of making the downs is to first make foamed grains of thermoplastic heart, a heat-hardening one Level A Hare on the surface of this foamed Applies granules and then the granules in the form of a Brings Rembran to foam and finally hardens the resin that cures in the heat.

Fig. 1 shows an example of such an improved construction of a membrane in the transverse direction, where alt 1

009829/1089 BAD ORIGINAL

Foamed grains have a thermoplastic harsea, such as expanded polystyrene and with 2 a binder layer made of a thermosetting resin * such as PbenolhAr8 _s .

A eo3che improved construction thermoplastic foamed granules in the dee a> a resin have been linked into the binder of the heat-hardening resin in ;,, fJberrageside own sheep ton has d.hc that they 1η · · η höheircn ~ Young's modulus, internal Verlu ? jt _t taechanische Peetigkeit and durability ale in the conventional one made ouch foams% 'on eyn * · thetiachen resins "has. However, this verbeeosrie construction has the disadvantage that when the thickness of the membrane is reduced, ζ, Β «. below 2 mm of the thickness of the membrane, only one or two foamed grains are localized, the ratio of 1 ». d & r heat h & x-tend resin is reduced to the thermoplastic resin foams, so that the expected result cannot be obtained «

Let therefore be an object of the present invention! to specify a membrane for a sound intrusion that has outstanding properties, i.e. low specific weight,

009829/1019 BAD OB (GiNAL

raised Young ¹ e-Mo <3ul and high internal loss, has «

Bine further object of the present invention, ee _t a method for producing such a membrane ansugeben "

A particular object of the present invention is to provide a membrane for a sonic instrument and a method for producing this membrane, whereby the disadvantages of the membrane described above are eliminated ₉ which essentially consists of an arrangement of foamed granules made of thermoplastic resin and a binder layer) beatahen in the heat-hardening resin.

In accordance with the present invention, a membrane is provided for a Sehallinatrunönt, that is an arrangement of foamed granules made of thermoplastic resin, a binding agent of in the heat hardening Haicas, which surrounds the foamed granules and in Orenulatkiier with each other to form uniformly Body "in the form of the membrane connects and a fiber-molded" reinforcement material, such as glass fibers "contains" which are applied to at least one surface of the body and embedded in the binder to form a reinforcing layer.

further is in accordance with the present invention

009823 / lOtö ⁰

a gate drive to produce a membrane for a sound * Instrument provided 'that consists in that nan first produces a foamed granulate from thermoplastic resin, a bit-hardening binder of grade A hardness on the foamed granulate, these two components are flattened together, the mixed grains and the binding material are arranged on every layer, then a fiber-shaped reinforcing material is placed on at least one surface of the layer applies and finally the layer under BLLdupg the membrane heats and hardens.

Pig, Fig. 1 is a cross-section of a known membrane and Fig. 2 lab a cross section of a Heabran according to the invention

fig, 2 explains a preferred embodiment of the present invention, in which old (3) foamed Kttrner au thermoplastic Her *, such as expanded polystyrene. With (4) a faaerföraigee is reinforcing Hiterial, like glass cloth, coated, while (5) denotes the binding agent au «in the hits hardening bari, wel * chee the columns swieohen the chilled granules and • wipe the fibers of the glass cloth fills} (6) marked the reinforcing layer that is on the surfaces of the Glam cloth and the binder is formed.

BATH ORIGINAL 00982 9/1089

Such a Kenftvati can be produced in the following VToIhs will*

First, PolyetyKolperlen are foamed primer and the foamed pearls is one. Mesh size from 1.67 to 3i93 am (4 to 10 raesh) are selected. The preferred area de? EörnergrüEe is 2.35 - 3 »H Bim (6 - 8 xeoh) 12 g one Epoxy resin and curing agent vegetables are made up to 1000 ml (about 20 g) of the primary foamed beads are added and mixed together mixed in a kneader. Two glass » tueher are prepared. Bines of the cloths will be on the Formofcerflöche placed in a cavity of a lower form and then the mixture described above is poured into the cavity. Daa other glass cloth is poured onto this one Mixture and then an upper mold is placed on the un «· tere Poraa on net. The forms are in a hot Preeee pressed together, in which the * Kicicbuzig to about 90 ° C heated for about 15 minutes. Then the shapes chilled. In this way, a membrane "that closes" borrowed from the mold.

The invention is illustrated in more detail by means of the following examples.

B e . i_.B pie 1 1:

At room temperature, a binding agent that hardens in the heat is

009829/1089

means of the Α stage in the liquid state produced by Ban a hitaehärtendee Hare Epikote Hr. 828 (trade name of Shell Chemical Co. Japan for an epoxy resin from bisphenol A and diglycidyl ether of molecular weight about 380) and a hardening agent Thomide No. 2356 (trade name of Fuji cheese! Kogyo K.K. Japan for tetraethylene « pentamln with a molecular weight of 700 to 1,000), whereby the weight ratio of the thermosetting resin to the hardness ) tungealttel 1 ble 0.2 let and the mixture has a viscosity of 7,000 cp. 20 g foamed polystyrene parleii from Molecular weight 200,000 of a specific bulk density (bulk specific gravity) vovr. 0.02 and a particle size from 2.35 - 3 »14 buns (6 to 8 meeh ASTM) were put into one Kneading bowl and then 12 g of the above prepared mixture of the hot-hardening resin were added in small Portions added while the kneader was working.

Bin oil cloth, consisting of € 0 warp threads and 60 weft threads per 25.4 ram, whereby leather thread consisted of 100 monophiles of 5 w diameter, and with a weight of 25.8 g / m ² and a thickness of 0.035 mm was prepared . A layer of this oleum cloth was placed in the cavity of a lower fora, and the above-mentioned mixture was poured into the cavity. Another layer of the same oil towel was placed on top of the filled mixture and then an upper mold was placed on the lower mold. the

BATH ORIGINAL 009829/1089

^{ίο sis was heated to 95 °} C. for 30 minutes under a pressure of 3 kg / cm ² (4 atti). After the end of the period, the porifl was quenched with water for 6 minutes and then the deformed product was sprayed. Was allowed theseA Products stand at room temperature Ji hours, Pie resulting membrane had a specific gravity of 3tv * B 0, "", a Itmng ^e a ~ Kodul of about 30 to 60 kg / amr and a tensile strength of about 0 _t 5 up to I ₃ O kg / mm ² «

§ ^s ia, yi, B ₁₁ 1 ₁ j? i

l 1 was repeated using the same

ΒβιΊβη unä ios glsiehön VöTfahrts "fflit öer Ab" - iig that 1? g of a mixture of Ipikote Hr ₀ 823 and id 115 {Hanöelefoe drawing of the Groneral MiHa for a Vc2 "asi! nid" -? ett8äurepolyaBi: -dharz vam molecular weight 800 to 1,000) all binders were used »In the binding» Bilttelgenlocb v / ar öaa Yarhaltenii "from Epikota ssu Vereamid 1 J Cieoe mixture had a" viscosity of 8,000 cp.

The resulting membrane had identical physical properties properties as in example 1.

B e 1. β pl e, 1 $ t

Example ι was repeated using the same geechgumton pearls and the process described there

009829/1089

the deviation! that as a heat-hardening HarEgeinisch with dta HMartungmittel 12 g of a Miechung von Plyophen Ifi '"6000 (trade name of the fleichhold Chemical;], Xne" for s: üi Heaorein / Paraforfflaldehyd-Hars with a molecular weight 100 to 400) and Plyophene ^ -Katalyeator JSTr ", 6002 (nung der Beichholrl öheraieala, Ine ftir. Since "ChH / iohtsverhöltnAa vmi resin to hardening agentlfcteX v / ru- 1 ι U ₀ 2, with a viscosity of 3,000 op redultiarte · Bia deformation periodo \ mv about 15 minutes.

The resulting Meaibi ^ aw hattii similar physical SIg- ^ nv ^ ie the uva 3yri.jpi; jlj 1.

Example 3 v / urdö v / repeated using the same perlesi and doa glulrhen therein in the "chi: i" method with the proviso that the mixture consists of heat-hardening resin, and iorttmg. "Ijibb" l as 12 g a ^ a ileiaiBchea of Plyophan ifr. 5O? 3 CH commercial advice to the Reichholo Chemicals Inc. for a Phrmoi-ForiBaldehyd-IIari? of the R ^ aol type and with the MoJUikui.ai weight 140 to 280) and BeneoJ eulfonaäura existed. Bas & Oewlchttiverh ltnl "bu of heat" curing hard Hßrtungeiaittel was 1 ι j 0.1 Mo resulting mixture had ep "a viscosity of 3 000th

_BAD ORIGINAL 009829/1019

Example 5 t

Example 3 was repeated using the same foamed vacation and the same procedure as there described, with the deviation “6ass alo mixture of thermosetting resin and curing agent 12 g of a mixture 9.4 g Bpikote Kr. 828 (see Example 1) and 1.5 Tritex H300 (Trade name dor Taiho Kogyo E.Kc, Japan, for a aliphatiechee Bolyamin) eov / ie 1.1 g of methanol used became.

The membrane had similar physical properties like «Sie de» Examples 1.

Example 6 t

Example 3 was repeated using the same foamed beads and the same procedure described therein except that Nikanol (trade name of Nihon Gas Kagaku Kogyo KK for m-xylene / formaldehyde prepolymer of specific gravity 1.05 »molecular weight 300 before curing and a viscosity of 4,000 cp at the Α stage at 30 ⁰ C) as a thermosetting binder and 0.05 parts by weight Nikanol LL (Handelebeeeichnung the Vihon Oaa Kagaku Kogyo KK for Monoäthylendianin) per Qewichtsteil binder as a catalyst

009829/1089 ^ÖAÖ

was used.

The physical characteristics of the Meiobi-an were similar w5 e «ie bi? I Belnpiel 1 *

Same results o uijrdmi ei'Kieltj whom »rasn ge & chäiamte pearls hasty Stygol / PiRl'I ^ lffethalat-Kia'jßiiOl.yaierSi aug 80 ßew .-? £ S ^ trrol um? 20 ßew _o - ^ l *?. RlIylphthalst dti-r g-aechäuKteß PolystyroJ ^ terlen τβπί ^ καβΐβο But no more than "70-Sgv '" .- = · ^ B1 ^ r, «l rai.t gutt ώ results used will.

In the case of the invention. Membranes is that weight £ ^ ee hit ebilrtenden binders about 0.1 parts by weight per FCI 2 Gewichtateii genchäuaste I ^l er \ s. M & nn less ale O ₅ I part by weight of binder ang & w & iKlet v / irsj, the mechanical Feetlglceit of the resulting membrane is too low and with more than 2 wt .- ^ binder the weight αβτ membrane is generally too high «

In the case of the membrane according to the invention, the Young ^{1 a} module can essentially be increased "without the ina epessiflache weight of the membrane increasing because the thermosetting resin has a large Young ¹ a module and the gap or . Gaps between the

009829/1089 _BAD OBIGINAL

foamed grains of thermoplastic resin having a low Young's modulus and the rubber sheet or the like forms a reinforcing layer on the surface of the membrane. Thus, an excellent diaphragm for a ball instrument can be easily manufactured in which the radiation efficiency increases and the decrease in the conductivity value in the high frequency region is effectively prevented. Because a high Young * e "Moäul" is caused by the reinforcing layer on the surface of the If & rcbxan ", I read a Ηβη" bran with a low "B. less than 2 mm, produced, without being ¹ s-module is due to the reduction ratio se dee "of hitsehäu'fcendem resin decreases Young"

It is known that a membrane made of foamed beads has a "thermoplastic resin""atleast" the bead of three beads "because" the bonding strength of the membrane is greatly reduced. If the thickness of the membrane is less than 2 mm, the membrane consists of only 1 or 2 foamed beads across its thickness, so that a satisfactory flexural strength cannot be achieved. In contrast, according to the invention, a satisfactory flexural strength can be achieved even if the Dick® is reduced to a length of 2 mm . By varying the ifjohungöw ^ häifcnlasee of tharrao «Hare and hitssehfiirfeandem Harss and a & m

009829/1089

The degree of foamed grains can change the properties of the Membrane can be adjusted on a case-by-case basis "because the grooved grains of the thermoplastic resin are covered by the thermosetting bars" results in a high strength and weather resistance, so that the M *> mbr & n not »o is easily broken by vibrations and the like, but rather has good fatigue strength.

The Muabran according to the invention is suitable for loudspeakers » for etereophonic systems or for an electronic one Musical instrument, you can also use it as a Reaonana body for a Guitar or pitmo were applied.

009829/1089

Claims (3)

1st 6 _ni ni ^: a tjLiLj \ Membrane for a KlonginetruKtnt, removed eiae arrangement νου gcio <häumöiü granulate bup ths-ii liar '* ■ as well as k) n binding agent eue hi.tzeliSrfencism v / elnheo oils ßssoiiSuöitieti.KÖrnsr uBrs tn Po ^ ia exercises mob toan nifePiiiainöcvr Trsrtin ^ s'Sip ■ Olsduveb. gt? k © η η β eich ϊϊ ο Ii ν dai = ¹ eiE fefösrbaltigsi ^ üea MaTCi'iai on vjoaigatens siay OlViji-flg-he öes Kohi; «Ml la the BiiideKitiöl ntitöi BiMimg layer fixed 2. Membrane according to Anapruch 1 ₁ . thereby gt? k as η η ζ eich net, öafi eie about 0.1 biö ^ 8-s * / _e ? - © iI © hitKehä »· = · tendea BAnöemitii-- ;! per entity. göcchäuEte «thermo« plai3fciecaeü 3. Membrane according to claim ι or 2, esadiu'ch g eke nn draw tr deß «la« geachäusite sranulate from poly styrene or ** styrene / diallyl phthalate-MiechpOlyiner which precautionary measure 80 Gev / «<^ Styrene, Reat ~ 3) iallyl- · phthalate cuthUlt, beeteht. 009829/1089 _a 4 · A method for producing a membrane according to claim 1 oie 3 »thereby known ο h η · t, that it primarily produces foamed granules of a thermoplastic heart "then a binding agent a hit-hardening resin of grade A su the foamed granules are mixed together, this mixture is arranged in the form of a layer * then on at least one surface of this layer a fibrous ^ granular reinforcing material applies and then the entire assembly is heated and cured on a layer of memhran. 009829/1089 _BAD ORIGINAL