US2268459A - Card cloth foundation - Google Patents

Description

Dec. 30, 1941. H. c. MURRAY 2,268,459

CARD CLOTH FOUNDATION Filed Jan. 24, 1940 1N VENTOR. mmn a. MJ/zW/IX ATTORNEYS Patented Dec. 30, 1941 CARD CLOTH FOUNDATION Harold C. Murray, Providence, R. 1., assignor to United States Rubber Company, New York, N. Y., a corporation of New Jersey Application January 24, 1940, Serial No. 315,294

2 Claims.

This invention relates to card cloth foundation and more particularly to the type of such foundation employing stretch-resisting cords in its construction.

Heretofore card clothing in the strip form known as fillet has been provided with a Weftless layer of stretch-resisting cords embodied in the card cloth foundation to prevent the clothing from stretching when wound tightly about the carding machine cylinder. Such card cloth foundation as commonly made heretofore has been formed of several strips of woven fabric such as cotton duck adhesively secured together, and a layer of stretch-resisting linen cords adhesively secured to a strip of cotton duck to form a twoply strip, which is then adhesively secured to the several layers of Woven cotton fabric.

It is found in practice that in manufacturing the card cloth foundation just described it is extremely difficult to prevent slight kinks or Waves from occasionally being formed in the linen cords which are adhesively secured by a rubber adhesive to the strip of woven fabric.

The objectionable kinks or waves may be caused by-the moisture of the rubber adhesive producing a slight shrinkage of the woven fabric relative to the linen cords which causes a slight buckling at spaced points in such cords. It is also sometimes caused by the ply material being jarred in handling before the wet rubber adhesive which secures the cords to the woven fabric has been dried or set.

If a card cloth foundation such as above described happens to have a kink or wave in the stretch-resisting cords and the Wire staples forming the carding teeth are set therein, then when such card cloth foundation is subjected to high tension the kink or wave will be straightened out. This straightening out of the kink in the cords will force the teeth located at such kink out of their proper position of alignment.

The shifting of the teeth out of proper alignment is highly objectionable, and an important feature of the present invention resides in a novel construction for overcoming this defect.

The invention will be fully understood from the following description when read in connection with the accompanying drawing illustrating one good practical embodiment thereof.

In the drawing:

Fig. 1 is a longitudinal edge view of a piece of card clothing consisting of card cloth foundation constructed in accordance with the present invention and provided with the usual wire staples or teeth.

Fig. 2 is an enlarged sectional view taken on the line 22 of Fig. 1; and

Fig. 3 is a plan view of a strip of woven fabric having the stretch-resisting cords secured thereto, and showing the objectionable wave in these cords.

It is well known that most woven fabrics will stretch a slight amount under tension as the serpentine configuration of their warp or weft threads assumes a more nearly straight condition under tension. In order to reduce this stretch of the woven fabric of the foundation it has been proposed heretofore to provide the card cloth foundation with the stretch-resisting linen cords above referred to. The cords used heretofore for this purpose have been 4/21 linen cords laid side by side in the form of a weftless layer upon the woven cotton fabric, and have been adhesively secured to each other and to the woven fabric by a rubber adhesive, and they have been arranged in the order of 30 cords per inch.

In accordance with the present invention much smaller stretch-resisting cords are used, such for example as 2/21 linen cords which are arranged 40 or more to the inch as a Weftless layer upon the woven cotton fabric. While these 2/21 linen cords are obviously not as strong as the 4/21 linen cords, this loss in strength is made up in part by the use of 40 or more cords per inch in place of the 30 cords to the inch used heretofore.

Furthermore the present invention contemplates the use of at least two separate weftless layers of these relatively small stretch-resisting cords in place of the single layer of the coarse cords used heretofore, and in carrying out the present invention one layer of these cords is adhesive-ly secured to one strip of woven fabric and the other layer of such cords is adhesively secured to another strip of woven fabric. Each strip of woven fabric having the layer of stretchresisting cords adhesively secured thereto is subjected to a drying operation so as to dry or set the rubber adhesive and thereby form a two-ply construction in which the cords are firmly secured to the supporting fabric.

The two-ply sheets thus formed may then be embodied in a cord cloth foundation by adhesively securing them to the desired number of strips ofwoven fabric. In most cases it will be desirable to ,provide the stretch-resisting cords near the back side of the card cloth foundation adjacent the crowns or dents of the wire staples.

An extremely important feature of the construction just described resides in the fact that while the objectionable kinks or waves above mentioned may still be produced occasionally along the length of each of the two-ply sheets, it is extremely unlikely that the wave in one two-ply sheet will lie near a wave in the other two-ply sheet. Therefore, one two-ply sheet will serve to prevent a wave in the cords of the other two-ply sheet from being straightened out in the finished card clothing by the tension to which it is likely to be subjected while it is being applied to the carding cylinder or when in use. It is this construction of the present invention which prevents the teeth of the card clothing from being shifted out of their proper position of alignment even when they lie adjacent a kink or wave in the V stretch-resisting cords.

The use of two stretch-resisting sheets of relatively small cords in place of the single stretchresisting sheet of coarse cords used heretofore, overcome a serious difficulty with the prior con-' struction and secures a more nearly perfect alignment of the teeth in the stretched card cloth foundation. Furthermore; these smaller cords form a firmer and more compact foundation than heretofore and the two rows or sheets of linen cords provide a stronger foundation with less stretch than heretofore.

In the embodiment of the invention illustrated in the drawing the card cloth foundation is shown as formed of five strips of woven fabric in each of which may be formed of cotton duck as heretofore, and of two layers of' stretch-resisting cords ll. One strip of woven fabric I is provided between the back or crown side of the foundation and a layer of cords II, and a second sheet of fabric I0 is preferably provided between the two layers of cords H as shown. It is to be understood, however, that other arrangements of the sheets of fabric l0 and the layers of cords l1 may be employed provided each layer of co ds II is firmly secured to a carrying strip ID as hereinafter more fully pointed out. It will also be understood that all the layers I0 and II are firmly united by a rubber adhesive adapted to hold the layers firmly together to form the card cloth foundation l2. Such adhesive should, however, be sufficiently resilient to permit the teeth l3 a limited freedom of movement in the foundation to facilitate the carding operation.

In Fig. 3 there is shown one of the above mentioned ply sheets consisting of a strip of woven fabric H) which has one of the weftless layers of the stretch-resisting cords adhesively secured thereto. As above stated, the cords II are secured to each other and to the fabric sheet III by a rubber adhesive which due to the wet condition in which it is applied to the fabric and cords provides a somewhat slippery surface therebetween so that a slight shifting of the cords upon the fabric when this ply material is being constructed may occur. Also, the moisture in the rubber adhesive may, as above stated,

By providing the present foundation with two separate layers of ply material each consisting of a layer of cords ll secured to a carrying strip of Woven fabric I0 as herein contemplated so that when a wave I4 happens to be formed in one layer the other layer of cords will prevent the straightening out of this wave in the foundation, the objectionable shifting of the teeth I3 out oftheir position of alignment will be prevented. Furthermore, by providing two layers of the cords ll any tendency of the cords of one layer to shift the teeth l3 laterally will be that the two layers of ply material each consisting of the cords and carrying strip H), be

made up independently so that the accidental cause a shrinking of the fabric l0 relative to a formation of a wave M in one ply material will not also be produced in the other ply material at the same place.

In practice the card clothing is wound about the carding cylinder under a tension of from 300 to 1000 pounds so as to wrap it tight upon the cylinder, but it is contemplated that'the present construction will prevent the waves H from being straightened out even under this tension, with the result that a much better alignment of the teeth l3 upon the cylinder can be secured than heretofore, and the objectionable shifting of the teeth as the card clothing is tensioned will be prevented.

Having thus described my invention what I claim and desire to protect by Letters Patent is:

1. Card cloth foundation including in its construction at least two independently formed ply sheets, each of which consists of a layer of weftless stretch-resisting cords and a carrying strip of woven fabric to which the cords are firmly bonded by an adhesive before these ply sheets are embodied in the foundation, said completed ply sheets being assembled in the foundation with other strips so that the layers of weftless cords are separated from each other and are covered at the outer faces of the foundation, whereby to provide a laminated construction in which the weftless layers are so assembled in the foundation that any waviness occurring in one weftless layer will be prevented by another weftless layer from straightening out in the finished card clothing.

2. Card clothing consisting of a strip of card cloth foundation having teeth set therein, said foundation including in its construction at least two independently formed ply sheets, each of which consists of a layer of weftless stretchresisting cords and a carrying strip of woven fabric to which the cords are firmly bonded by an adhesive before these ply sheets are embodied in the foundation, said completed ply sheets being assembled in the foundation with other strips so that the layers of weftless cords are separated from each other and are covered at the outer faces of the foundation, whereby to provide a laminated construction in which the weftless layers are so assembled in the foundation that any waviness occurring in one weftless layer will be prevented by another weftless layer from straightening out in the finished card clothing.

HAROLD C. MURRAY.

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