US 2109583 A
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March 1, 1938. BENNETT 2,109,583
GUMMED TAPE Filed Feb. 8, 1936 IN VEN TOR. ARTHUR BENNETT BY W .4,
Patented Mar. 1, 1938 UNITED STATES PATENT. OFFICE GUMMED TAPE Arthur Bennett, San Francisco, Calif.
Application February 8, 1936, Serial No. 62,977
1 Claim. (Cl. 154-43) The invention relates to adhesive or gummed tape in general, and particularly to the so-called pressure sensitive adhesive tape, or ever-tacky gummed tape, which merely requires pressing firmly against a surface to make it adhere thereto, and still more particularly to the type of ever-tacky gummed tape as shown in my copending patent application filed on March 26, 1935, under Serial No. 13,037.
The principal object of the present invention is to provide a combinationof two gummed tapes to facilitate transfer of an ever-tacky layer of gum from a carrier strip to an object having a frail or soft surface to which it is desired to apply the ever-tacky layer. Other objects and advantages of the invention will appear in the following description and accompanying drawing.
In the drawing Fig. 1 shows in perspective a strip of paper tape gummed on one side over its entire area.
Fig. 2 is a similar view to that of Fig. 1 but showing a strip of paper, cloth or other tape,
gummed on one side with a narrower strip oftion gummed tape constituting the invention.
Fig. 4 is a side elevation showing the compound gummed tape of Fig. 3 turned upside down and with its wide gummed face stuck to an object and the cloth or other backing of the ever-tacky gum layer being stripped off.
Before describing the present invention in detail, reference is directed to my copending case referred to and which describes a gummed tape having a layer of ever-tacky gum on one side of the tape of narrower width than the tape, and of relatively feeble attraction for the surface of the tape as compared with its attraction or power to stick to the surface of an ordinary object such as paper, cardboard, metal, glass, dry paint, etc., so that after firmly pressing the ever-tacky face of the tape upon such an ordinary object, the tape proper could be easily peeled away from the ever-tacky layer and leave said layer in evertacky condition bodily transferred to said object.
Such transferring ever-tacky gummed tape as above described would not work very well on some special surfaces, such as very soft, frail or highly absorbent surfaces like soft paper or blotting paper, loosely made soft cardboard in which the material was so weak that it would tend to split or come apart when attempting to pull off or strip the cover tape.
The present invention overcomes the difficulty above outlined, by providing a compound tape provided with a relatively wide strip gummed on 5 one side as with a dried mucilage or glue coating from edge to edge, and which strip is moistened on its gummed surface and stuck to the object desired, and a relatively narrow strip of evertacky gum is left on the outer surface or back 10 of the wide gummed tape by peeling away from it an outer covering tape, thus leaving permanently attached to the object a wide gummed tape stuck to the object by common gum on its under side and the back of which wide tape 15 carries a narrower band of ever-tacky gum.
In Fig. 1a fiexiblestrip or tape I is shown covered on one side with an adhesive or gum layer 2. The tape I may be tough paper or of any other strong flexible material such as Cello- 2 phane, and the gum layer is a dry layer of any adhesive such as used in gumming postage stamps, envelopes, etc., which must be moistened to make it sticky so that it may be stuck to any desired object. 25
In Fig. 2.is shown a flexible strip or tape 3 on one side only of which is deposited a narrower layer of gum 4. This tape may be of tough paper or Cellophane, but preferably is of a sized cloth known to the trade as Holland cloth, and the 30 gum layer 4 is of a character which will not dry, or will dry so very slowly that'it will remain in a tacky condition for a long time, or several years, so that it may be said to be in ever-tacky condition and will stick to any ordinary surface by 35 pressure alone, without requiring any moistening.
Such ever-tacky gum is well known and not concerned with the present invention as it is treated of fully in my copending application, as is also the relation of the tape surfaces or nature 40 thereof relative to the ever-tacky gum to permit the tape 3 to be peeled from the ever-tacky layer 4 when the dry gum layer 2 is stuck to an ordinary surface. However, for convenience the formula of the ever-tacky gum of the copending 45 case, while not specifically concerned with in the present case, is here repeated as follows:
Pale crepe crude rubber, first pref- I erably milled to effect better solu- Place in a suitable closed mixer and agitate until dissolved into a smooth thin paste.
Such a gum forms an ever-tacky layer when coated on paper which will permit a covering strip of Holland cloth, Cellophane, or hard glazed paper to be peeled from it, especially if the covering strip were given a surface treatment with talc or parafllne.
The present invention comprises-the combination of the two tapes of Figs. 1 and 2 into a sandwich as shown in Fig. 3 wherein the parts as described bear the same numerals, and from a consideration of which figure it will be seen that tape I and its dry gummed layer 2 are coextensive, tape 3 is narrower than tape I, and that the ever-tacky gum layer 4 is narrower than tape 3.
Such a combination tape, having a hard and dry gummed outer surface 2, may be freely rolled up upon itself without sticking together. When unrolled its gummed surface 2 may be moistened to make it adhesive and it may then be applied to any ordinary surface or object 5, permitted to set, and the tape 3 peeled away from its layer of ever-tacky gum by pulling with the fingers as shown in Fig. 4 so as to leave the wide tape firmly cemented to the object 5 and with the narrower strip or layer of ever-tacky gum 4 exposed in ever-tacky condition on the outer surface of the wide tape I so that the object I (which may be an advertising sign) may be itself applied to another surface or object for adherence thereto through means of the ever-tacky layer 4.
In forming the compound tape of Fig. 3 I prefer to first coat the tapes I and 3 and bring them together as described, but it is possible to form it otherwise, such for instance as by applying the ever-tacky layer directly to the opposite side of tape I after its gum layer 2 is dry, and thereafter applying tape 3 as a covering strip to the ever-tacky layer.
2,1oatas The object of having the tape I narrower than tape I is to permit it to be picked up at either edge with the fingernail, when desiring to strip it from the ever-tackygum, for if both tapes were the same width this would be very diflloult, especially if some of the moistened gum layer 2 squeezed out along the edges to stick both tapes together when applying the compound tape to the object. This object is further facilitated by having the ever-tacky layer 4 still narrower than tape 3.
The object of having the ever-tacky layer 4 much narrower than gummed layer 2 is to provide a wider area of attachment of tape l to the object so that it the latter is of soft weak material it will not split or tear, through the upward pull exerted in peeling the tape 3 from the applied combination as a unit stress to which the soft, weak material is subjected may be but a third or less than that effective on the cover strip or tape 3 due to the great difference in their overlying adhesive areas.
Having thus described my invention, what I claim is:
A compound gummed tape comprising a strip of paper coated on one side with a moistureactivatable glue the same width as the tape and coated on the other side with a layer of pressuresensltive glue of substantially narrower width than the width of said moisture-activatable glue and centrally located on the strip leaving uncoated margins on both longitudinal edges, and. a strip of Holland cloth covering said pressuresensitive glue, said covering of Holland cloth being of greater width than the layer of pressuresensitive glue but of lesser width than the width of the paper tape.
' ARTHUR BENNETT.