US2345376A - Method of making flocked floor coverings - Google Patents

Description

March 28, 1944. V

V. H. BODLE ET AL METHOD OF MAKING FLOCKED FLOOR COVERING Filed Dec. 20, 1939 2 Sheets-Sheet 1 March 28, 1944. v BODLE ET AL 2,345,376

METHOD OF MAKING FLOCKED FLOOR COVERING Filed Dec. 20, 1959 2 Sheets-Sheet 2 Patented Mar. 28, 1944 UNITED STATES PATENT OFFICE I METHOD or r ocxnn FLOOR 7 Virgil H.

Ind., assignors Bodle and George W. Blair, Mishawaka,

to Mishawaka Rubber and Wool- Mishawaka, 1116.,

Application December 20, 1939, Serial No. 310,112

Claims. (Cl. 117-16) Our invention relates to floor coverings or the like wherein a cushiony base is surfaced with a wear resisting or decorative layer or coating and has reference more particularly to a composite material of this character having a sponge rubber base and a surfacing of flock or short fibres.

In many cases it is desirable to provide a relatively inexpensive material for floor covering and similar purposes which not only has the appearance and feel of fabric carpeting of substantial depth but also has wearing properties which will withstand prolonged hard usage. This is accomplished in accordance with the present invention by employing a sponge rubber like backing, Preferably with ribs or projections on the under side freely expanded to an especially soft cushiony texture and provided with a top covering of flock, preferably composed of or including fibres of sufficient length arranged to simulate a napped or pile fabric, a reinforcing of fabric or the like being preferably interposed between the flocking and the top surface of the sponge rubber backing.

The principal objects of our invention are to provide an improved sponge rubber backed flock surfaced material suitable for use as carpeting or the like; to utilize a cushion backing which not only imparts to the composite material the feel of fabric carpeting of substantial depth but also minimizes wear on the tread surface, serves as effective heat insulation and is advantageous from a sanitary standpoint; to provide a flocked surface which imparts a fabric like appearance; to apply flock composed of fibres of appreciable length endwise to the surface so that they project outwardly therefrom; and in general to provide an improved sponge rubber backed flock surfaced material which is comparatively inexpensive and durable and an acceptable substitute for fabric carpeting, as well as improved ways of making same, these and other objects being accomplished as pointed out hereinafter and as shown in the accompanying drawings in which,

Fig. 1 is an inverted perspective view of a small section of carpeting material made in accordance with our invention;

Fig. 2 is a sectional view of the material of Fig. 1;

Figs. 3 and 4 are sectional views showing modified forms of the material;

Fig. 5 is a view somewhat diagrammatic and partly broken away showing a device which may be employed for flocking or applying fibres to the surface of the material;

through which the fibres are supplied to the surface of the material;

Fig. 'l is a transverse sectional view of a liner which may be employed to wind the flocked material in separated convolutions on a drum;

Fig. 8 is a view, somewhat diagrammatic showing calendering and vulcanizing equipment for making the material;

Figs. 9 and 10 are fragmentary detail views of two of the calendaring rolls;

Fig. 11 is a fragmentary view of the roll for applying the flocked sheet to the calendered rubber;

Fig. 12 is a view, somewhat diagrammatic showing another form of device which may be employed to apply the flocking to the surface of the material;

Fig. 13 is a fragmentary detail view of a portion of the discharge plate of the device of Fig. 12;

a Fig. 14 is a view somewhat diagrammatic showing calendering, flocking and vulcanizing facilities with flocking instrumentalities all arranged to apply the flocking after the rubber and. fabric layers are combined;

Fig. 15 is a detail view showing a series arrangement of flocking units which may be employed to supply flock throughout the width of the sheet;

Fig. 16 is a fragmentary detail view of a portion of the spinner used in the flocking devices of Figs. 14 and 15; and

Fig. 17 is a perspective view of another form of spinner which may be employed in the devices of Figs. 14 and 15.

Referring first to Figs. 1 and 2 of the drawings which show our preferred material, the reference numeral 20 indicates the sponge rubber backin which is preferably ribbed on the under side as shown at 2|. A reinforcing fabric 22 which may be of any desired kind and weight, but preferably a coarse open mesh burlap, is attached to the top surface of the sponge rubber backing 20 and this fabric 22 has an outer surfacing 23 of flock, preferably composed of short fibres of appreciable length, attached endwise to the outer surface of the fabric 22 by a suitable bonding medium 24 so that the short fibres project outwardly therefrom.

It is to be noted that the sponge rubber backing or base 20 constitutes the major portion of the thickness of the composite material, a substantial thickness of sponge rubber being desirable not only to give a satisfactory depth of cushioning to impart to the composite material the desirable feel of a high grade thick carpeting but also to Fig. 6 is a fragmentary detail view of the screen safeguard the tread surface against excessive wear which would otherwise occur if the tread surface were inadequately cushioned against the impact and pressure of shoes thereon. This thickness of The sponge rubber backing 20 may be made in any desired manner and have the'fabric 22 cemented thereto either before or after the top surface thereof is flocked, but it is preferred, to utilize a sponge rubber backing made as described in our application,.Ser. No. 158,465 filed August 11, 1937 and to calender the sponge rubber in the unblown and unvulcanized condition onto the fabric.

In making the sponge rubber backing 23 according to our above mentioned application, the milled rubber containing appropriate compounding ingredients and a blowing agent is calendered between rolls, one of which is provided with grooves or other recesses which produce on the calendered sheet incipient ribs, projections or other formations which in a subsequent blowing operation are expanded in the open without any confinement which would interfere with the freedom of expansion thereof, thus providing a self assumed or self determined external shape and surfacing of the ribs or projections without any mold restriction, thereby aflording a finished vulcanized product of an exceedingly soft spongy character which is especially desirable for our present p se.

In utilizing this procedure in making our present material we calender the unblown sponge rubber onto the fabric 22 either before or after the flocking 23 has been applied to the fabric.

The flocking material may be of any desired kind and applied in any conventional manner as for example by rotary brushes which discharge the flock onto the surface of the fabric 22 which has been previously cement coated or provided with an adhesive surfacing to which the particles of flock or fibres will adhere. We prefer however, to use a flocking material consisting of or including fibres of sufficient length to afford a napped or pile like surface and to apply these fibres forcibly and in an endwise manner to the adhesive surface so that they adhere firmly and extend outwardly from the surface to a sufficient extent to give a nap or pile like effect.

To accomplish this endwise application of the fibres to the coated surface a device such as shown somewhat diagrammatically in Fig. may be employed comprising rotary brushes 25 to which a regulated quantity of flock is supplied in any conventional manner from the hopper 26 and from which said brushes 25 the flock is discharged through a vibrating screen 21 onto the previously adhesive coated surface of the fabric 22.

In this illustrated device of Fig. 5 the fabric 22 is fed from a roll 23 over the rollers 29 and 33 and the distant roller 3| in advance of which last mentioned roller 3| the flocking occurs, and the flocked fabric 22, which may first pass through a drying zone, is preferably wound on a reeling device similar to that shown in Hunt Patent No. 1,908,425 having two reels 32 and 33, the former of which carries a liner 34 with raised margins 35 between convolutions of which the flocked fabric 22 is wound on the reel 33 with the flocked surface facing outwardly and devoid of pressure thereon due to the spacing of the liner convolutions by the raised margins 35 thereof.

A doctor blade 36 extends across the surface of th fabric 22 and in close proximity thereto as shown in Fig. 5 to spread a coating of a heavy cement on the top surface of the fabric 22, the cement being poured or otherwise supplied on fabric as indicated at 31 immediately ahead of the doctor blade 33 which distributes the cement uniformly throughout the width of the fabric. Beyond the doctor blade 38, the fabric passes over a series of rapidly rotated heaters 33 which vibrate the stretch of fabric vertically as it travels thereover and located approximately over ,the first beater 33 is the fiock feeding device com-. prising a series of opposed pairs of brushes 25 all rapidly rotated in the directions indicated by the arrows, to which said bilishes flock is supplied as aforesaid from the hopper 26. Located near the end of the beater area is a suction funnel 39 under which the fabric passes, this funnel being connected with a suction blower (not shown) which serves to remove excess unattached flock from the traveling flocked fabric 22.

The'wire screen 21 which is preferably of a mesh to have relatively long narrow openings 4| as shown in Fig. 6 which extend lengthwise in the direction of travel of the fabric 22, is disposed beiow the brushes 25 rather closely above the traveling cement surfaced fabric 22 and extends entirely thereacross. This screen is secured along its rear edge to a fixed cross bar 4| of the machine and has its forward edge sprung upwardly and provided on the under side with a reinforcing impact strip 42 which rests on a rapidly rotated square shaft typ of vibrator 43 by which the screen 21 is rapidly vibrated in a direction substantially perpendicular to the coated surface of the fabric 22 thereunder.

This screen 21 and the rapid vibration thereof serves to up-end the fibres discharged therethrough by the brushes and by reason thereof the fibres are applied and attached to the coated surface largely in an pwardly projecting position.

Because of the coarse open texture of the fabric 22, cement may penetrate therethrough and collect on the rollers 29, 30, 3I' and other parts of the machine and to avoid this we employ a sheet 44 of any suitable material such as paper or close woven fabric, or the like, as a liner under the fabric 22 and traveling synchronously therewith. This sheet 44, which is of a width corresponding to the width of the fabric 22, may be endless with return length leading back to the roller 29, but we have found it convenient to feed the liner from a roll 45 at the front end of the machine and wind it from the machine on a roll 46 which is interchangeable with the roll 45.

The flocked sheet 22' may, if desired, be cemented onto the sponge base 20 after the latter is blown and cured but we prefer to calender the unblown rubber compound onto the back side 01' the flocked sheet and thereafter expand and cure the rubber compound attached to the flocked sheet and vulcanize the blocked adhesive 24 at the same time.

This flocked sheet 22 which has been wound on the roll 33 of a portable reel as indicated in Fig. 5 may be fed from the reel 33 to the calender which is shown somewhat diagrammatically in Fig. 8, or if preferred the reel may be omitted and the flocked sheet fed directly from the flocking device to the calender, which of course would be suitably synchronized with the flocking device.

For attaching the calendered rubber to the flocked fabric 22*, it is desirable to previously coat with a light cement the surface of the fabric to which the calendered rubber is to be applied. This may be done by looping the fabric 22, before the flock is applied,-through a bath of the cement which is dried before the fabric is supplied to the flocking machine, or the cement may be applied by running the fabric between rolls such as shown at I3 and 15 in Fig. 14 one of which has the cement applied on the surface thereof, likewise as shown in connection with the roll 13 of Fig. 14, the latter method being preferred as it is only necessary to cement coat one side of the fabric and both sides become coated in the bath method above mentioned.

The calender is of common form comprising superposed rolls, for example the rolls 41, 45, 55 and 55, by which the unblown rubber compound indicated at 5| is formed in a sheet 52 and applied to the flocked sheet 22, the roll 45 being engraved with suitable recesses or grooves, as for example at 53 to provide one face of the rubber sheet 52 with incipient ribs or other projections which subsequently are blown and expanded to form cushioning elements, and this ribbed sheet is applied on the cemented back of the flocked sheet 22 as the latter and the rubber sheet 52 pass between the rolls 4!! and 55.

In the subsequent blowing of the rubber compound of the sheet 52 it is desirable to permit escapement of any ,gas which may be emitted from the rubber between the rubber sheet and the fabric sheet 22", in order to avoid blistering which might otherwise occur, and accordingly it is preferred that the cement coating for attachment of the calendered rubber be applied so that it does not prevent such gas escapement. If the fabric is cement coated by the bath method hereinbefore mentioned it accordingly is preferable to pass the fabric, after looping in the cement bath, between pressure rolls so as to compress the fab'ric and squeeze out excess cement. In addition we prefer to provide the rubber sheet 52 with a knurled surface for attachment to the fabric and for this purpose the roll 55 is engaved with a knurled surface 54 to imprint a knurled surfacing to the rubber sheet before the latter is applied on the fabric. This knurled surface of the rubber not only facilitates the attachment of the rubber to the fabric but also provides channels through which gas may permeate and escape to and through the fabric 22 in the subsequent blowing.

After the rubber sheet 52 is attached to the flocked fabric 22* the composite material, indicated at 55, is subjected to vulcanization, preferably by passing through a long heated compartment 55 in which appropriate different temperatures are provided throughout the length of the compartment as explained in our above mentioned application Serial No. 158,465 to properly eflect complete blowing or expansion of the rubber compound and curing thereof as the material passes through the heated compartment 55, the cement being cured at the same time. Preferably, in its passage through the compartment 55 the material is supported on a belt 51 of wire mesh or the like with the flocked surface facing upwardly or downwardly as preferred, it being shown in the latter position in Fig. 8. 4

The roll 55 of the calender may be a plain the flocked surface an appearance simulating tuft rows which are more or less visible in tufted carpeting.

Other facilities may be employed for flocking the fabric, as for example. as shown in Fig. 12 in which the fabric 22 is fed from a roll onto a traveling apron or belt 55, which is trained above the rolls 5|, 52 and 55, and after flocking is wound in a roll 54 preferably with a raised edge liner like that shown in Fig. 'I.

A doctor blade 55 is provided above the fabric 22 near the top of the inclination between the rolls 5| and 52 to spread the flocking cement 55 on the fabric 22 in the same manner as in the structure of Fig. 6 after which the cement coated fabric passes around the roll 55 where the flocking is applied.

For flocking a cylindrical brush 51 of a length to extend across the width of the moving sheet 22 may be employed and rapidly operable in the indicated direction over a plate 55 which extends horizontally to a point close to the curved coated surface of the sheet 22 on the roll 53, and this plate 55 has narrow channels or grooves 59 in the upper surface extending from the brush to the discharge edge of the plate 55. Flock is supplied to the surface of the plate 55 immediately behind the brush 51, as for example by a rotary screen feed 15 and apron II, and the brush 51 which operates at high speed in the direction indicated by the arrow, and which engages slightly in the grooves or channels 59, impels the flock fibres outwardly along the channels 59 in an endwise manner and discharges them endwise against the coated surface of the sheet 22. An endwise tapping or vibratory effect may be imparted to the plate 55 if desired in any well known mariner to facilitate the laying of the flbres longitudinally in the grooves or channels 55.

The plate 55, it will be observed, extends radially from the roll 55 about which the coated fabric 22 is curvedly shaped so that the-flock roll, but it is advantageous to provide same with o is applied to a curved surface, which is advantageous as it permits fuller application of flock with a resultant more compact flocking when the fabric is straightened out.

Another method of flocking is shown in Fig. 14 in which the flock is applied to the fabric 22 after the calendered rubber is attached thereto. In this method the fabric 22 is first led from the roll 12 between the rolls I3 and I4, the former of which has a hopper like cement holder I5 at one side with an open side next to the roll 13 and a bottom serving as a doctor blade permitting application on the roll I3 of a thin coating of cement which is transferred to one side of the fabric 22 as the latter passes between the rolls I5 and I4, this cement coating being on the side of the fabric to which the calendered rubber is thereafter applied.

After this cement coating the fabric 22 is passed between the rolls I5 and II of a calender sheet 22 as the latter passes between the rolls l1 and 78, the latter of which may be a plain roll.

The combined fabric and calendered rubber sheet, indicated at 82, is then directed upwardly to the receiving end of a conveyor 83 which like the conveyor 81 of Fig. 8 -operates in a vulcanizer 88 in which temperatures are provided to sponge and cure the calendered rubber and to cure the cement. I

At the outer fabric side of the upwardly'traveling length of the calendered rubber fabric 82 a this spinner 8|. a substantia1 width of discharge is afi'orded depending upon the vertical width of the blades 88 and accordingly the flocking is accomplished more rapidly on account of the area over which the flock is applied. A single spinner 88 or 85 may be employed and mounted to reciprocate back and forth across the cementhopper 85 is provided closed at one side by the material 82 so as to subject the fabric side of the material to the heavy cement 88 in the hopper, a doctor blade 81 beingprovided above the hopper close to the fabric surface to regulate the amount of cement coating provided surface of the material 82' but it is Preferred to employ abattery of spinners in overlapping verti'cally staggered relation as shown in Fig.

so as to simultaneously fiock the entire width of the material 82;v material 22 may be employed, or instead-of the fabric 22 asheet 88 of solid rubber may be employed as shown in-Fig. 3 and the latterprovided with a flocked outer surface 23 .or the flocking on thefabric and to spread the cement uniformJy.

Above the doctor blade 81, flock is applied to, the thus cement coated surface oi the fabric 22- of the upwardly traveling material =82. ".The

flock may be applied in any convenient man-# ner, as for example with a-flocking device like. that shown in Fig. 12 or as shown in Fig. 14 by one or more rotary spinners 88. The spinners 88 are arranged horizontally as shown with the periphery spaced from but close to the cemented surface of the material 82.

Flock is fed onto the top surface of each spinner from the spout 88 of'a screw feed 88 or other suitable feeding device which leads from a supply hopper 8| and each spinner 88 is operated in any convenient manner, as for example by a motor 82 direct connected therewith, at

- high speed so that the flock deposited thereon -is discharged bycentrifugal force against the serve asjguides in and by which the short pieces of fibres are causedto'assume an endwise'position as they are impelled outwardly, thu insur-' ing endwise discharge and endwise application a ainst the surface of thematerial 82.

As "an alternative the. spinner may .be conmay be'applied'directly to the top surface of the sponge rubber .base 28 ifi-desired as shown in F -r1 .While we have shown and described our invention in a preferred'form, we are aware that various cha'nges and modifications may be made thereinwithout' departing from the principles of our'invention; the scope ofwhich is to be deter- 25 mined by the appended claims.

We claim as our invention 1. The method of making a fibrous surfaced material which comprises mechanically propelling relatively straight fibres of appreciable length forcibly against an adhesive coated sur- I face of the material, and physically guiding the propelled fibres along a series of laterally ad- J'acent channels in an endwise direction toward the material.

' 2. The method of producing a fibrous surfaced material which said method comprises centrifugallyimpelling fibres of appreciable length endwise through a series of laterally adjoining channels agalnstthe adhesive surface of a base. I

3. The method of making fibrous surfaced floor covering or the like, which said method-comprises centrifugally 'impelling and physically uiding relatively straight fibres of appreciable length endwise along .a series of laterally ad- .joinin'g .channels against an adhesive surfaced base.

4. The. method of producing fibrous surfaced material which comprises centrifugally impelling fibresof appreciable length against an adhesively surfaced base and guiding the fibres in a series of laterally adjoining channels between the zone of centrifugal irnpelling and the base.

structed as shown at" in Fig. 17 with a central radially sloping or conical surface 86 onto which the fiock is discharged'from the spout 88 and this cone 86 has blades 81 extending radially-out- -ward therefrom and each provided with a P1111 ralityf of'small'radial channels, like the channels 69 of P18. 13 or V-shaped if desired, in which .the flock fibres are caused to assume a radial position as they are impelled outwardly anddischarge endwiseagainst the material 82. With 5. The method of producing a fibrous surfacedmaterial which said method comprises forcing relatively straight individual pre-cut fibres of appreciable length endwise against the. adhesive surface of a base, and includes sliding the fibres endwise along'a series of narrow laterally adjoining channels toward the base.

VIRGIL H. BODLE. GEORGE w. BLAIR.

Any desirable reinforcing I

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