US2041120A - Heat and sound insulating composition - Google Patents

Description

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ATlNG'OR PLASRC I Patented 'y 9, "11936 l [SOUND INSULATING '7 f v CLUOMPOSITION if o FFlcE v This invention relates to artificial sheet material fireproof in nature and adapted among other uses to employment as a-structura1 unit. ,In

various industries very large quantities of light sheet material are ;for use for insulating, as for e xample,in frame structures such as houses,refrigerators and the like. In addition to being light in weight such-material should possess a marked degree of :rot prooiness and termite and fungi resistant qualities, be sufilciently stifi to hold its proper shape, S ould be .eifectively fireproof :and to a certain degreesound absorptive. Due

to these severe requirements the production of such' material particularly in view of the fact that the great amount of material used necessiitates the reduction of cost to the lowest possible epoint to admit a profitable sale thereof. of course, reduction of cost maybe-obtained by use of cheap materials but such expedience ordi- ,nariiy results in sacrificing-in some degree- ,one or more of the characteristics article of this kind. j w The general purpose of the present vthe provision of a fire-proof, sound-proof, rot proof, and termite resisting vstructure ,which possesses the desired characteristics in adequate degree and yet may be produced at a relatively low cost. Another object is the provision for production of the article. h a Other and further objects of the invention and or a method the advantages of the same'will be pointed out hereinafter indicated in the appended claims, or be obvious to one skilled in the art upgan understanding the pr ent disclosure. i r V For the. se of this application there has been elected to set forthtwo particular .struc :tureg and onerpamcular t od oib producine h d as th inventionv h te its .fwmprhensive pe in theart.

lithe same, butit is to be .understood'ttiat they are'liere presented for illustrative purposes-only and arenot to be accorded any interpretation such as mightshave the effect of limiting'what is] l true vand The article will be termed wood wool with it is to be understood that ;this is note-to be v -;'construed as a limitation upon the articlepro- "-duced."

"Wood of a suitable slender pieces ot what may be termed fine exdesired in an invention is InsuliteComPany, Minn ap -i poration'ofMinnesota I g 1mm, i L'Application Mal-chi,

, v-;SerialNo.713,517

j I. Liquid parts 100 a Ammonium sulphate 'do 8 IAmmonium phosphate do 2 Suitable toxic agent... ..grams -60 V fHydrated wood pulp parts I '10 m Liquid -parts- 100 ammonium sulphate do 8 -Ammonium phosphate ;do 2 'Dinitrophenol s grams 30 pulp parts n 10 :15 Fm.-uquid; n ;s ans 50 ZSilicate Of S Oda d0 50 Whiting. do- 20 "IV; j.. ...parts 'Zjnc chloride dn 5O -Toxic agent -do 20 'suitable-pul do 20-30 ;ilffliqiuid 1;;;L;;;i:;. ;parts 100 i j' lern iteand fungi resisting material :,i.. grams 60 round wood (or suitable pulp) parts 8-15 Mater resisting material ..do 10-30 36 -I"The wood wool should remain in the solution a suficient length of time for the fireprofing solution and/or the water proofing material to penetrate the slenderflbers. The time required for depends upon a number of conditions, one be- -,,ing the temperature of the solution and another and vfineness of the wood wool. Very satis- -=Iactory results have been obtained by permitting jwood fool to, e the solution from 5 to 30 minutes.' i i; 4 40 4A certainz' rtion of the pulp used will adhere nor cling to the woodwool and serves as a cement-.

material ito bondthe wood wool loosely together. thexwood woo {has remainded in the solution fora suflicient length of time for the material to penetrate the slender fibers the wood wool is removed vand the'free solution permitted to drainofl. 'f The wood wool is then formed into fwhat would betel-med aibat. V, r

r '7 suitable .i batting equipment may be rin-.. 7 "in utilized. For example a batting equipment may be used including a long screenapron having a. vacuum box on the lower side thereof.

The wood wool is permitted to fall from a relatively great distance above the screen and the air passing through the screen distributes the wood wool uniformly over the surface of the screen and in a substantially heterogeneous arrangement.

Wood wool is deposited to a thickness depending upon the desired thickness of the finished product, for example, the wood wool may be deposited until it is approximately one foot in thickness and when thus deposited is very loosely arranged and highly porous.

The deposited material is then compressed to approximately 4 inches in thickness and is held under pressure while it is drying and the wood wool under these conditions has been found to have a very low conductivity and is suitable for many uses. When applying pressure heat may be applied to expedite the drying and bonding.

It may be used for insulating frame buildings by filling the space between the studdings and the outside and inside of the walls. This arrangement of the insulating material prevents convection and transfer of heat from the inner wall to the outer wall and vice versa. One suitable way in which the material can be satisfactorily used in insulating frame buildings is by forming the wood wool bat into bodies which are approximately 14 /2x22 inches and of the desired thickness. As the finished bat is sponge like and easily compressible it will readily adjust its thickness and over all dimensions to compensate for variations of space in the wall.

Of course it is to be understood that if the material is required to be water proof water proofing material of the proper kind is added to the solution in which the shredded material is saturated.

This material also may be utilized in various ways and one of the modified ways of so using it is by depositing a relatively thin layer of the saturated fibers on the batting equipment and securing by an adhesive, covering sheets. This will provide fiexible sheets of material that may be used for linings. The adhesive used for securing the liners is preferably a fire-proof adhesive although it is not intended that the invention is to be limited to such an adhesive. A preferable way of making a flexible sheet of the kind just described is to deposit the shredded material on a support until approximately one to two inches in thickness and move this layer of material between covering sheets which have applied thereto an adhesive then subjecting the composite sheet to pressure while drying, and for example is formed into sheets of approximately 10 feet in width and of any desired length. It may be applied by rolling the material against the studdings of the wall and then securing it to the studdings. Thexplaster receiving base may then be secured to the studdings over the sheet of fiexible material. This arrangement provides a wall of very low conductivity at a relatively low cost.

I claim:

1. A method of making fire resisting, sound absorptive, insulating material which comprises reducing woody material to long, slender, curly shavings, preparing a fire resisting solution which includes two parts of ammonium phosphate and eight parts of ammonium sulphate, adding a binder consisting of eight to fifteen parts of wood pulp, depositing the shavings in the solution for a time sufiicient for the strands to become saturated, forming a relatively thick product from the shavings, and subjecting the product to pressure while drying.

2. A method of making fire resistant, sound absorbent insulating material, which comprises reducing woody material to long, slender, curly shavings, depositing the shavings in a solution including ammonium phosphate and ammonium sulphate, commingling a binder consisting of 8 to 15 parts of woodpulp, with the shavings forming a relatively thick product from the shavings, and drying the product.

3. A light, spongy, fire resisting bat, comprising a net work of slender, curly shavings oi? woody material saturated with a fire proofing solution which includes 2 parts of ammonium phosphate and 8 parts of ammonium sulphate, and bound together by woodpulp, the pulp being present in an amount just sufficient to function as a binder.

4. A sound absorbing and fire-resisting bat, comprising a network of slender shavings of natural wood fire-proofed with materials which include ammonium phosphate and ammonium sulphate and bound together by wood pulp, the pulp being present in an amount just sufiicient to function as a binder.

GEORGE H. ELLIS.