DE1273778B - Sound absorbing plate - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. Cl .:

E04b

German class: 37 a - 1/86

Number:
File number:
Registration date:
Display day:

P 12 73 778.9-25 (O 7348)

April 12, 1960

July 25, 1968

The invention relates to a sound absorbing panel consisting of a base layer made of mineral fiber material loose structure, a firm, thin, perforated cover layer and one with expressions provided sound-permeable intermediate layer made of mineral fiber material of a more solid structure.

In general, such panels are first placed in place; H. at the place of their use, assembled, since so far there have always been difficulties in bonding the individual layers to one another without Have shown impairment of the sound-absorbing properties.

In known plates, the cover layer is usually perforated in order to prevent sound waves in any case simply be reflected, and to ensure that a significant part of the sound waves penetrates through these holes into the actual sound-absorbing main body.

In such sound absorbing panels, the intermediate layer is usually provided with characteristics that ao Although it does not affect the sound permeability of the intermediate layer itself, it does have a reinforcing effect or resilient storage for the fairly thin and fairly rigid cover layer. Previously restricted one can rely on letting the intermediate layer only take on a single function, namely that of trickle protection, causing loose material from the main body to fall through the holes the cover layer should be prevented. On the hole side of the cover layer facing away from the room a thin, light felt was glued, through which the sound absorption rate was somewhat impaired. These In modern constructions, the function of the felt is taken over by the intermediate layer.

In a known construction of the type mentioned at the outset with a base layer made of mineral fibers the cover layer consists of metal. It was not intended to go through the three layers Glue or the like to unite.

Cushions made from sound-absorbing mineral wool have also been used in metal shells. These Bowls were firmly mounted and were provided with holes so that the sound waves could enter and that shielded sound-absorbing fiber cushions can reach.

Such metal trays and additional hanging devices are additional elements that reduce the total cost increase significantly. They are also disadvantageous in that they are dented and out of place forever Can be brought into shape.

According to the invention, the intermediate layer in sound-absorbing panels of the type mentioned at the outset should now be as follows Sound absorbing plate

Applicant:

Owens-Corning Fiberglas Corporation,

Toledo, Ohio (V. St. A.)

Representative:

Dipl.-Ing. R. H. Bahr

and Dipl.-Phys. E. Betzier, patent attorneys,

4690 Herne, Freiligrathstr. 19th

Named as inventor:

Frank O. Brisley,

Ulysses T. Gambill, Newark, Ohio (V. St. A.)

Claimed priority:

V. St. v. America April 24, 1959 (808 647)

be designed that without impairing the acoustic effect a secure bonding of the three layers to one plate is made possible.

This is achieved with a sound absorbing plate, consisting of a base layer made of mineral fiber material loose structure, a firm, thin, perforated cover layer and one with expressions provided sound-permeable intermediate layer made of mineral fiber material of a stronger structure in that the three layers are glued together and those are adjacent to the base layer and the cover layer Surface parts of the intermediate layer are compacted.

The cover layer is made of a plastic-bonded glass fiber fabric with particular advantage manufactured.

The plate according to the invention not only has extremely good sound-absorbing and heat-insulating properties Properties on, but also a stable, resiliently supported surface, which shocks and Is able to absorb and absorb blows without the risk of breakage. A special protective layer od. The like. Can be omitted, even where the requirements for such plates are very high, as in Ships of the war and merchant navy.

The plate according to the invention can also be easily washed without losing its properties,

809 587/87

3 4

If the cover layer has the appropriate properties, the synthetic resin also strengthens the glass base has, and repeatedly delete. body. Such a glass cloth is largely un-

The board according to the invention, which is preferably made of combustible, since the inert glass fibers are approximately 80% Fiberglass is made, will make up the appropriate of the material and the low proportion of Material selection due to fire, moisture and heat 5 vinyl laminate impregnation agent extremely good not adversely affected and has a low level of flame retardancy. Although the top layer is firm weight on. and strong, it is a bit flexible and gives under

The main advantage of the plate is its pressure, which reduces the risk of breakage in the event of blows similarly low manufacturing and installation is largely reduced. By the elastic cost, ίο city of the underlying intermediate layer and the The intermediate layer takes over with this plate the back base layer becomes the top layer after a reinforcement. Due to the compression the release of the pressure back into the correct position Grained with cover and base layer for gluing.

after sealing by the impregnating agent,

Truncated impressions from both sides, _i5_which — the_Abdeckschicht are generally as reliable bonding partners surfaces sound waves are impermeable, it is formed for those with an adhesion that is obviously significantly greater than that of a loose layer. The abrasive material is perforated in the main part of the plate. The top layer is a plastic-bonded glass fiber cover layer 11 comprises rows of circular fabric, the intermediate layer is formed on the self-static as holes 12, for example with a Durchmesbilen carrier. ser of about 5 mm, being the center of each

In the following, the invention is to have a distance of about 12 mm from one another based on the holes. Drawing will be explained in more detail. This shows in these dimensions, the holes 12 take approximately

1 is a perspective view of a portion 15% of the area of the layer 11. The hole portion a sound absorbing plate according to a preferred 25 can be between 6 and 20% of the area. Embodiment of the invention, Although its resilience, its denting

Fig. 2 is a vertical partial section through the strength, its flame retardancy, the low cost Plate according to Fig. 1 along the line 2-2, or their light weight is not so excellent,

Fig. 3 shows a similar section along the line 3-3 can be seen in the manufacture of the sound absorbing plate the F i g. 1, 30 according to the invention also other covering materials

F i g. 4 is a partial perspective view of a sound use. A practical example of this is a swallow plate with another intermediate layer, woven mat made of glass fibers. The usage

Fig. 5 is a perspective view of a hot mat, however, brings a reduction press to form an intermediate layer for that of tensile strength with it, which may not Plate according to FIGS. 1 to 3, 35 is desired. Since there is also more organic binding

F i g. 6 an enlarged section through the molding means in the mat is required, takes the flame part the press according to "Fig. 5 with an inserted resistance. Other possible substitutes are Me glass fiber blank and metal or plastic grids or nets, woven fabrics

F i g. 7 a corresponding section according to the organic fibers or other fibrous materials, such as ming of the blank. 40 asbestos, paper and cardboard. The disadvantages or weaknesses

The plate 10 according to the invention in FIG. 1 has a number of such exchange materials result from For example, the usual size 60 X 90 cm and even has its own legs, if one has its known properties Cover layer 11 made of interwoven, with synthetic resin seeks.

impregnated fiberglass yarns, preferably with The adhesive 13 is flame retardant and was on

weighing between 575 and 685 g / m ² and 45, layer 11 in amounts of 102 to 138 g / m ^{2 to} a thickness of approximately 0.4 to 0.5 mm. brought. It serves as a solidifying agent for connecting

This glass cloth is a common product. When the cover layer is formed with the intermediate layer 14. The glass fibers used are con This has a total thickness of approximately 6 mm. continuous filaments with a common diameter. It has a waffle-like shape with regular of 0.009 mm. One to two hundred such threads 50 spaced staggered from one another are collected into strands, which on below frustoconical expressions 16 and 18 on The mandrels located in the extraction furnace are wound up on both sides. The "manifestations 16 are exactly the. These strands are then plied and under the holes 12 in the cover layer 11 and to a yarn of the desired weight and which run from an outside diameter of 9.5 mm to desired tensile strength twisted. The yarn tapers to 55 to a base diameter of 6.1 mm. The intermediate layer 14 preferably consists of

Woven fabric. For a sound absorbing plate, a compressed, bound pad is recommended A satin fabric is advisable, as it is after all Rieh glass fibers. With regard to the low weight, the has the required tensile strength and a sound-absorbing effect and the thermal insulation is inherently uniform and beautiful finish delivers. 60 especially glass fibers with a diameter

For the production of the cover layer of a Schaller in the range from 0.003 to 0.006 mm. Fibers with swallowing plate according to the invention, for example, even smaller diameter will improve certain of this basic cloth with a flame retardant in the properties of the product, while fibers with larger-heat-curing vinyl laminate resin in quantities of larger diameter up to 0, -18 mm to similar heights from 34 to 54 g / m ² impregnated-This synthetic resin lead 65 results and for economic reasons fills the gaps in the cloth, which are more useful.

The surface is sealed and smoothed and the size of the fibers is determined by the type and control

weave becomes dirt-repellent and easier to wash. tion of the fiber puller determined. Without

5 6

Consideration for the special fiber production process- mh ° C. If an even stronger thermal insulation

If, for example, the fibers are desired for the manufacture, then the base layer 28 can also

development of the intermediate layer according to the invention to have a thickness of 10 to 15 cm,

collected in a blank, in which an uncommon- Though the one reproduced in the drawing tete binder component is dispersed. The 5 waffle pattern of the intermediate layer is particularly suitable for

Binding agent must be a permanent firm bond between plates according to the invention, can even-

between the fibers at the contact and crossover understandably also other forms for use

points and a fire must not start without the end product being significantly

to chat. These claims are best borrowed from suffers.

by a component made of melamine phenol form- io The plate shown in FIG. 4 has a aldehyde in proportions of about 1: 2. The amount of intermediate layer 38, in which a flat middle of the binding agent can be between 9 and 26 parts by weight 43 round, wart-like percentages on both sides the finished intermediate layer, depending on embossings 40 and 41 are pressed out. Through this Spherical cavities 44 are formed of the desired strength ratio. The pages- and flame retardancy in the final product. 20% use expressions 40 and 41 and the bedet you when there is a great risk of fire. rich of the middle part 43 in between form the paths

The intermediate layer 14 is shaped so that the for the sound waves. The upper part of the manifestations

both sides 20 and 22 circular surface parts 23 acts as a point of contact and attachment for connecting

and 24, diametrically between the impressions 16, adhesive bonding of the intermediate layer to the cover layer

and 18 respectively. These surface parts are, for example, 11 or with the base layer 28.

point to a thickness of 1.2 mm and a density that is shown in FIGS. 5, 6 and 7 press shown is used

compressed between 0.25 and 0.52 g / cm ^3. The preparation of the preferred embodiment of the

Parts 25 of the intermediate layer, the partition walls, intermediate layer 14. According to FIG. 5 instructs the press

Form between the expressions 16 and 18, have a foundation 56 on which the lower mold 58

a much lower density, preferably of 25 is mounted. Over the main surface of the lower mold

half of those of the compressed surfaces 58 have the ends of pins 59 protruding, which the

chenteile 23, 24, so for example between 0.12 expressions 18 in one side of the intermediate

and 0.26 g / cm ³ . make layer 14.

The surface parts 23 form a solid base for the upper stand 61 of the press

adhesive connection of the intermediate layer 14 with the 30 form 62 mounted. Same as pins 59, however

Cover layer 11, while the porous partition walls offset pins 64 protrude from the upper surface

fertilize 25 for the sound waves passing through the holes of the shape 62 down. The plunger 66 is

12 penetrate, are easy to penetrate and Bah- guided through a cylinder 68 and moves the

nen to the base layer 28 of the sound absorbing panel upper frame stand 61 and the upper mold 62

form. 35 on guide rods 69 down.

The surface parts 24 on the other side of the intermediate The upper and lower mold parts are on one Selenium layers form solid surfaces for bonding, heated to the temperature of approximately 200 ° C of intermediate layer 14 and base layer 28, select to activate binders in the fiberglass mass. to rend the expressions 18 a free passage- this purpose one can use steam, however Space for the 40 penetrating through the walls 25 are electrical heating elements for safety reasons Form sound waves. The base layer 28 is preferred at; the installation of these elements is at the a preferred embodiment by an embodiment according to FIG. 5 by electrical porosity Mass formed from bonded glass fibers, conclusions 70 indicated. The enlarged section after the fiber lengths being 25 mm and more. F i g. 6 shows the shape as it approaches its

In a similar way to the production of the 45 end position. The pins 59 and 64 have tapered fiber bodies for the intermediate layer 14, the frustum-shaped ends 72 are used for the production of the Ausprä fibers for the base layer 28 in a thick path lines 16 and 18 in the blank 74 of the intermediate layer brought together under a molded hood. The with on. This blank 74 is based on the dimensions Binder-impregnated mass is then applied to the mold from a mass impregnated with binders desired thickness compressed while the 50 fiberglass web of the desired type cut out-binder is cured in the heat. ten. According to FIG. 7 have the molded parts 58 and 62

The binder component should be flame-retardant to the blank 74 in the desired waffle pattern.

be as possible. For this reason they are used compressed. The pressure applied can be

expediently the same melamine-phenol-formaldehyde and an intermediate layer of about 90 cm in length

hyd resin as used in the manufacture of the intermediate 55 60 cjn width on the order of about 151

Layer 14. It is particularly useful to use a bandage. The binder component generally requires

Medium proportion between 9 and 26 percent by weight of my 3 to 5 minutes to harden with a

combined fiberglass-synthetic resin mass to a temperature of about 200 ° C. If in this way

turn around. the blank is formed and the resin cured

In place of the melamine-phenol-formaldehyde as is 60, the fibers of the molded blank 76 remain in

Binder in the glass fiber board according to the invention their position, without them having the tendency to

You can of course also manage other groups together.

use settings. These include epoxy, a preferred method of association

Urea and polyester resins. the cover layer 11, the intermediate layer 14 and

The base layer 28 should have a thickness of at least 65 the base layer 28 of the plate 10 consists of the first

at least 37 to 55 mm and a density of only 0.03 to step in, the intermediate layer 14 with the base

0.05 g / cm ³ . The layer then has a layer 28 to connect. This is done in that

Thermal conductivity of approximately 0.0136 kcal / man of a solvent-based gum base adhesive

26 applies to the relevant side of the intermediate layer. You have to make sure that this Adhesive does not penetrate into the expressions 18 and this closes, as this prevents the passage of the Sound waves to the base layer 18 would interfere. The intermediate layer is then under pressure, however pressed onto the base layer 28 without the application of heat until enough solvent has evaporated that the glue holds.

The combination of base layer 28 and intermediate layer 14 is then bonded to the cover layer 11 under heat and pressure. The heat the adhesive 13 previously applied to the layer 11 melts, so that the side 20 of the intermediate layer is covered. With this adhesive, the cover layer 11 must be carefully placed, so that the holes 12 are centered over the frustoconical Variations 16 come to rest. The edge of the finished panel 10 is then closed. The filled edge of the intermediate layer 14 can be seen from FIGS. 2 and 3.

At a size of about 60 X 90 cm with a base layer 28 of 5 cm and an intermediate layer 6 mm thick, the total plate has a thickness of approximately 58 mm and a weight of approximately 2200 g.

The low weight and the strength of the plate allow it to be installed without difficulty to handle. On bulkheads or other steel partition walls or frame parts in ships to fix the panels with pins and brackets.

If there are no steel wall elements or if you do not want to use pins for other reasons, then the plates are preferably glued on with an adhesive, expediently based on rubber.

If necessary, the plates can be removed with the help easily cut with a knife to the desired dimensions.

Claims (2)

Patent claims: 1. Sound absorbing plate, consisting of a base layer of mineral fiber material looser Structure, a solid, thin, perforated cover layer and one with embossing sound-permeable intermediate layer made of mineral fiber material of a more solid structure, characterized in that that the three layers (28, 14, 11) are glued together and those on the base layer (28) and the cover layer (11) adjacent surface parts (24, 23) of the intermediate layer (14) are compressed. 2. Sound absorbing plate according to claim 1, characterized in that the cover sheet (11) consists of a plastic-bonded glass fiber fabric. Considered publications:
German utility model No. 1695 077;
French patents No. 739 334,
1066781.1103 319;
Belgian patent specification No. 506 602;
U.S. Patent No. 2,667,925. 1 sheet of drawings 809 587/87 7.68 © Bundesdruckerei Berlin