US 1924472 A
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G. M. THOMSON METHOD 0F AND MEANS FOR 'MANUFACTURING SOUND ABsoRBING MATERIAL Aug. 29, 1933.
Filed Nov. 28, 1930 2 Sheets-Sheet 1 I I I l l l Il INVENTOQI GEORGE M. THOMSON ATTO RNEYS.
Patented Aug. 29, 1933 UNITED STATES PAT vENT ovl-"Fica IVIETHOD 0F AND' MEANS FOR RIANUFAC- TURING SOUND ABSORBTNG MATERIAL George Millerv Thomson, Caledonia, Ontario Canada Application November 2s, 193e serial No. 498,895
Claims; (Cl. 154-28) 10 having a multiplicity of narrow wedge-shaped sive to staggered spaced points on opposite sides.
cells, and the present invention provides an advantageous method of manufacturing such a product.
'According to the present invention the sound absorbing material is produced by applying adheof exiblematerial, such as asbestos paper, and then producing a stack of such strips and allowing the adhesive to dry. The resulting product 0 can be readily expanded to any desired degree to produce any predetermined width of cell vopening, by bending the material to a suitable curvature, applying adhesive to the concave face oi'l the curved material, then applying a backing to the curved face,'and then flattening the material.
A convenient method of continuously manufacturing the sound absorbing material will now be described.
, Referring now to-the accompanying drawings, whichA illustrate, by way of example, one convenient embodiment of the invention,
Figure 1 is a diagrammatic side elevation of part of the improved apparatus,
Figure 2 is a plan view on the line 2-2 of Figure 1,
Figure 3 is a side elevation of another part of the apparatus on a larger scale,
' Figures 4 and 5 are side elevations illustrating subsequent steps in the improved method of manufacturing sound absorbing material.
Figures 6 and 7 are plan views of the sound absorbing material produced by the method illustrated in the other figures, the material being shown contracted in Figure 6 and expanded in Figure 7, and l y Figure 8 is a diagrammatic perspective view ofthe adhesive-applying means shown in Figures 1 and 2.
According to the ilustrated form of the invention, a web of suitable flexible material 1, preferablvl asbestos paper, advances from a supply roll-1a and passes successively over a guide roll 2, an adhesive-applying roll 3, guide rolls 4, guide roll 5, an adhesive-applying roll 6, guide roll 7, drive rolls 8 and betweencrimping rolls 9.
The roll 3 is arranged to apply parallel lines or bands of adhesive 10 to the surface 11 of the web of paper 1, while roll 6 isarranged to apply parallel lines of adhesive 12 to the surface 13 of the paper 1, the adhesive lines l2 being dis' posed midway between the lines 10 as shown in Figure 2. This is preferably accomplished by providing distributing rolls 3a and 6a beneath the rolls 3 and 6 respectively. 'Ihe rolls 3a and 6a dip into adhesive containers 3b and 6b and 35 the pairs of rolls 3. 3a and 6,. 6a are rotated by a suitable means, not shown, in the direction of the arrows in Figure 1. The rolls 3 and 6 are provided with Scrapers 3c and 6c formed with notches 14 in their scraping edges, as indicated 70 in Figure 8, the spacing and width of the notches being determined according to the desired spac-J ing and width of the lines of adhesive 10 and 12. The liquid adhesive is carried up by rolls 3a and 6a and is transferred to the rolls 3 and 8, the thickness of the adhesive films transferred to the rolls 3 and 6 being adjustable by varying thev distance between the rolls. For example, the axles of the rolls 3 and-6 may be journalled in side frames, such as 17. The spacing of the rolls 3. and 3a, and 6 and 6a, may be adjusted to obtain the desired thickness of adhesive by means of screws 18.
block 15, supported upon springs 16 in slots in so The adhesive which passes through the slots 14 of. scrapers 3c and 6c is applied to the surfaces 1l and 13, respectively, of the paper web 1, and the guide rolls 5 and 7, the drive rolls 8 and crimping rolls 9 are formed with annular grooves 90- 19 so as to avoid disturbance of the adhesivelines 10 and 12.
The crimping rolls 9 fold or bend the web l into a zigzag formation, as indicated at A, and at this stage may be supported by any suitable means such as an endless belt 20.
The crimped paper A is then manipulated to close up the folds thereof into the form indi-1 cated at B, in which form the paper will be held as soon as the adhesive lines 10 and 12 dry. This operation may be performed by the means indicated in Figure 3. Arcuate ngers21 are caused to oscillate about pivots 22 by means of rotating .cams 23, against which the fingers are held in Figure 4.' The material B is fed between two suitably spaced grinding wheels 26, which grind off the upper and lower surfaces of the material B and thus produce a material indicated at C, which consists of a stack of rectangular strips of paper connected to one another at staggered points on opposite sides of each strip. A portion of the material C is shown in Figure 6 in which the lines of connection on one side of each strip are shown at 10 and on the opposite side of each Vstrip at12.
The material C is next expanded to form the material indicated at D in Figure '1, the degree of expansion being determined in accordance with the characteristics of' the sound waves to be absorbed, as referred to more particularly in applicants copending. application No. 498,896.
u The expansion is preferably effected by the method illustrated in Figure 5. The contracted material C is placed on a cylindrical member 2'1 with the paper strips extending parallel to the axis of the cylinder, so that the strips will tend to assume a radial position with respect to the axis of the cylinder. The outer face ofthe material C is thus caused to assume the expanded condition illustrated (to an exaggerated extent) in Figure 7. Adhesive is then applied to the outer edges forming the curved outer face of the material C and a backing of flexible but inextensible ma ferial 28, such as paper, is applied. The backing 28 need not extend entirely over the face of the material, but may consist of, say, three strips of paper, one along each edge of the material and another at the middle thereof. As soon as the adhesive has dried the material is removed from the cylinder 27 and flattened and the front face of the material then automatically assumes the same expanded condition as the back face. Thus, by selecting a suitable diameter of cylinder 27, in relationA to the thickness of the material C, any desired degree of expansion can be readily effected,and permanently xed by applyingthe backing 28.
Many modifications within the scope of the appended claims may be made without departing from the invention.
What I claim is: l
1. A method of making sound absorbing material which comprises applying adhesive atstaggered spaced points on opposite sides of flexible material, producing a stack of rectangular strips of the exible material with the adhesive thus applied thereto, allowing the adhesive to dry, then expanding the resulting material to a definite predetermined extent,.and securing said material in said definite expanded condition.
2. A method of making sound absorbing material which comprises applying adhesive at staggered spaced pointswon opposite sides of vflexible material, crimping said material transversely, closing the folds of said crimped material upon one another, removing the outer surfaces ofsaid closed, crimped material, allowing the adhesive to dry, then expanding the resulting material to a definite predetermined extent, and applying an inextensible backing to one side of the expanded material.
3. A method of making sound absorbing materiaLwhich comprises applying adhesive at staggered spaced points on opposite sides of flexible material, producing a stack of rectangular strips of the flexible material with the adhesive thus applied thereto, allowing the adhesive to dry, then expanding the resulting material by bending said resulting material over a cylindrical surface of predetermined radius, applying a backing of iiexible inextensible material to the outer face of the bent material, and then fiattening the backed material.
4. A method of making sound absorbing material which comprises continuously advancinga web of flexible sheet material, applying spaced, parallel lines of liquid adhesive to one surface of said web, applying similar spaced parallel lines of liquid adhesive to the other surface of said web in staggered relation to the first mentioned lines of adhesive, crimping the webv laterally into a zigzag formation, closing the folds of said allel lines of liquid adhesive to opposite sides of a web of flexible material, the adhesive lines on one side being staggered with respect to those on the other side, crimping the iiexible material, closing the folds of the crimped material, allowing the adhesive lines to dry, grinding off thev outer faces of the closed crimped material, ex panding the resulting product to a definite, predetermined extent, and securing said material in said definite expanded condition.
'6. A method as claimed in claim 5, wherein the closed, crimped material is then expanded to form a multiplicity of double-wedge-shaped cells by bending `the closed crimped material to a curvature of predetermined radius, applying a flexib1e.inextensible backing to the convex face of thematerial and then flattening the backed material to cause the previously concave face to be expanded to the same extent as the previously convex face.
'7. A method as claimed in claim 5, wherein the adhesive is applied b y supplying liquid adhesive to a roll engaged by the exible material, scraping from the roll all except spaced lines of adllesive, and rotating the roll to move said lines of adhesive' continuously into contact with said ilexible material.
. 8. A method as claimed in claim 5, wherein thev cept spaced lines of adhesive, and adjusting the thickness of then transferred film of adhesive by moving the distributing roll towards or 'away from the supply roll.
9. Apparatus for making sound absorbing material comprising means for applying staggered -spaced lines of adhesive to the opposite sides of flexible sheet material, means for then forming a stack of strips of the flexible material, means for expanding the resulting material to a definite, predetermined extent and means for securing said material in said definite expanded condition,
10. Apparatus for making sound absorbing matex-iai comprising means for continuously applying staggered spaced lines of adhesive to the opposite sides of a web of iiexible sheet material, means for continuously advancing said web, means for crimping said web laterally, means for closing the folds of said crimped material on to one another, means for maintaining the folds of condition.
GEORGE MILLER THOMSON.