US1319455A - Corrugated-paper tube - Google Patents

Description

G. H. BARTLETT.

CORRUGATED PAPER TUBE.

APPLICATION FILED FEB. 14. 191B.

Patented Oct. 21, 1919.

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Specification of Letters Patent.

TED STATES PATENT OFFTCE. ononen n. nanrnnrnor sAn rnmrcrsco, cumrom'a, nssrenon r zunrroimn or SAN FRANCISCO, cnmromvm, A CORPORATION or CORRUGATED-PAPER Patented @ct. 21,1919.

Application filed February M, 19-18. Serial No. 217,062.

' tion.

This inventionrelates to a paper tube and the process of making same.

It is the principal object of this invention v to provide a paper tube which may be rapidly manufactured and which is so formed as to possess considerable strength as well as to provide an interior lining which i will protect fragile objects inclosed therein.

The. present invention contemplates the use of flat cardboardsheets wrapped helically upon a paper tube forming machine of common construction and which are combined in the course of manufacture with layers of helically arranged sheets of corrugated cardboard.

Certain forms into which the tubes are made and an embodiment of a machine for producing such tubes are illustrated by way or example in the accompanying drawings, in which Figure 1 is a view disclosing a length of tube formed according to the spirit or the present -invention and with a portion of its outer wall broken away toindicate the joint I in the wall layer therebeneath.

Fig. 2 is a View in transverse'section, as seen on the line 22 of Fig. 1, illustrating the correlation of the outer solid-wall and the inner corrugated wall combined therewith.

- Fig. 3 is a'view in transverse section illustrating the tubing as. crushed to conserve space in'shipping.

Fig.4 is a fragmentary view illustrating the arrangement of the outer and inner thicknesses of the tube wall and themanner in which their jointsare disposed.

' V Fig. 5 is a view in diagram disclosing one form of tube wrapping machine upon which the tubes may be made.- i I Fig. 6 is a-view in transversesectiomdisclosing a second form o fjtube having-an inner and outer thickness of cardboard-and an interposed layer of corrugated material.

.' Referring morepartiou arly to the 'drawings,'10 indicatesthe cylindrical mandrel mandrel and are used to wrap strips of card-' board lt'and thereon with the side edges of the coil in abutting relation.

As illustrated in Fi 5, the cardboard it is smooth and flat while the cardboard I5 is corrugated. As arranged, the corrugated cardboard will be wrapped directly around the mandrel and the, smooth cardboard wrapped thereover;'1 the joints of the con- I volutions of each cardboard occurring intermediate the width of the other cardboard, as particularly shown in Fig. 4. While the belts are driven in the direction of arrows a, as shown in Fig. 5, the two-ply tube will be. formed and the two layers of cardboard will be helically arranged. The layers are arranged in overlapping relation, the side edges of the smooth layer being located at the median plane of the corrugated layer and the corrugated layer having its side edges located at the median planes of the smooth layer.

As the wrapping continues the tube will be forced along themandrelinthe direction of arrow 72, it being understood that a suitable adhesive material has been applied 7 to the adjacent faces of thetwo cardboard layers so that theywill adhere to form atube having the cross section indicamd in Fig. 2.

A tube or the character shown in'Fig. 2'

' will have a helically wrapped outer wallof smooth cardboard and a helically wrapped inner wall of corrugated cardboard. It Wlll be readily recognized that these two walls so arranged willuhave greater-strength than twosimilar walls of smooth cardboard, due to the corrugations of the board and their helical arrangement and that a desirable. cushion will be formed to protect fragile objects packedwithin the tube. In order to conserve space in shipping-the empty tubes a pair of crushing rollers 16 and 17 is spaced a jacent to the outer end of the mandrel l0 and equidistant from the longitndinal axis thereof. lln this manner they will provide a throat through which the tube will be forced. This will cause the rollers to crush the tube, as shown in Fi 3, after which it may be cut in lengths by t e revoluble cutting member 18.

It will be readily recognized that paper tubing designed for different uses may be made by this machine and its strength readily determined. Fig. 6 discloses one other form of the tube which is provided with an outer smooth cardboard layer 19, a smooth inner layer 20 and an intermediate layer of cardboard 21, all of which are helically wrapped and are treated with an adhesive material to form a unitary wall structure. This form of tube will thus have smooth inner and outer walls and an intermediate stifi'ening and buffer wall. It is evident that other modifications of the invention could be readily produced as occasion demands.

It will thus be seen that wheli'paper tubes are formed according to the spirit of the present invention their walls will be uniform in thickness and the smooth layers of the walls perfectly flat without creases and breaks as commonly occur when combining flat cardboard and corrugated paper to form circular containers. It will further be noted that due to the fact that the corrugations extend helically the strength of the tube will be materially increased without adding to its weight, and thus strong protective tubes may be made of paper in a rapid and inexpensive manner not possible when made as commonly constructed.

While I have shown the preferred form of my invention as now known to me, it will be understood that various changes inthe combination, construction and arrangement of parts may be made without departing from the spirit of the invent-ion as disclosed.

Having thus described my invention, what I claim and desire to secure by Letters Patent is- 1. A paper tube comprising alternate layers of smooth and corrugated paper helically wrapped in overlapped relation to each other, each layer having the side edges of its convolutions in abutting relation.

2 A paper tube comprising an outer layer of smooth cardboard wrapped helically, and an inner layer of corrugated cardboard wrapped helically in overlapped relation with respect to the outer layer and glued to the said outer layer to form a composite wall, the side edges of the convolutions of each layer being in abutting relation.

3. A cardboard tube comprising layers of flat cardboard and layers of corrugated cardboard arranged helically and glued in overlapped relation to each other with the side edges of one of the layers at substantially the median line of the other layer.

4. A method of forming a cardboard tube, consisting in simultaneously wrapping layers of smooth and corrugated cardboard in overlapped relation around a forming mandrel with the side edges of one layer atsubstantially the median line of the other layer.

and applying an adhesive material to their adjacent sides whereby a composite tube will be formed.

5. A method of forming corrugated cardboard tubes consisting in simultaneously wrapping layers of flat and corrugated cardboard upon a cylindrical mandrel and in superimposed overlapping relation to each other, afpplying an adhesive to the adjacent faces 0 the layers, and thereafter passing the tube through a pair of crushing rolls after which it is severed into lengths.

6. A paper tube comprising layers of flat and corrugated cardboard helically wrapped in overlapping relation with the side edges of the corrugated layer substantially at the median line of the smooth layer and with the cofiugations extending spirally around the tu In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

-GEORGE H- BARTLETT. Witnesses:

C. S. RUTHERFORD, W. S. Rms.

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