Packaging covers for coiled sheet material

April 21, 1959 a. a. abramson 2,883,045

PACKAGING COVERS FOR COILED SHEET MATERIAL

Filed March 8, 1957

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United States Patent Office _P . » 2383,045

Patented Apr. 21, 1959

2,883,045

PACKAGING COVERS FOR COILED SHEET MATERIAL

Alvin A. Abramson, St. Louis, Mo., assignor to Central States Paper &amp; Bag Co., St. Louis, Mo., a corporation or Missouri

Application March 8, 1957, Serial No. 644,845

Claims. (CI. 206—59)

This invention relates in general to packaging and, more particularly, to a packaging cover for coiled sheet material.

Sheet metal as it comes off of a rolling mill is usually wound into hollow cylindrical coils so that the sheet metal can be conveniently handled, shipped, and unrolled when the metal is ultimately used. However, the coil of metal is subject to exposure to dirt, water, and other corrosive elements, and, furthermore, the exposed side edges of the sheet forming the coil 'are frequently sharp and are, therefore, likely to injure persons or objects which might contact them. Consequently, it is desirable to package the coil in such a manner that it is completely enclosed within the packaging cover. In addition, the packaging cover should fit snugly over the coil and must be applied in such a manner that it will not accidentally open or tear when the coil is handled. It is also desirable that the packaging cover be relatively inexpensive and capable of quick application to the coil.

It is, therefore, one of the primary objects of the present invention to provide a packaging cover for coiled sheet metal and the like which snugly and completely encases the coil.

It is also a primary object of the present invention to provide a unique and highly efficient method packaging coiled sheet metal and similar materials.

It is also an object of the present invention to provide a packaging cover of the type stated which will not become accidentally opened or tom.

It is an additional object of the present invention to provide a packaging cover of the type stated which is formed of a plurality of pre-cut pieces which can be quickly and easily applied to the coil.

With the above and other objects in view, my invention resides in the novel features of form, construction, arrangement, and combination of parts presently described and pointed out in the claims.

In the accompanying drawing—

Fig. 1 is a perspective view of a coil of sheet material enclosed in a packaging cover constructed in accordance with and embodying the present invention;

Fig. 2 is a fragmentary sectional view taken along line 2—2 of Fig. 1;

Fig. 3 is a bottom plan view of a side cover sheet forming a part of the present invention;

Fig. 4 is a perspective view of the core tube forming part of the present invention;

Fig. 5 is a perspective view, partly broken away and in section, of the core tube of Fig. 4, and showing the core tube opened out;

Fig. 6 is a top plan view of the outer cover sheet forming part of the present invention; and

Fig. 7 is a fragmentary bottom plan view of the outer cover sheet shown in Fig. 6.

Referring now in more detail and by reference characters to the drawing, which illustrates a preferred embodiment of the present invention, A designates a packaging cover formed of plain, reinforced or treated heavy kraft paper or suitable plastic sheet, which encloses a hollow coil of sheet metal B and comprises a rectangularly shaped outer cover sheet 1 having opposite faces a, b. The face a is provided along its longitudinal margins and ^one transverse margin with connecting bands of pressure5 sensitive adhesive 2, 3, 4, and the face b is provided along the remaining transverse margin with a similar band of pressure-sensitive adhesive 5. It has been found in connection with the present invention that one suitable type of adhesive for the bands 2, 3, 4, 5, is an aqueous disper10 sion of latex of which the following is a preferred example:

Percent by weight

Rubber_________________________________________

Sodium poly acrylate 0.3

Sequestering agent 0.5

Antioxidant 2.0

Ammonia χθ

Water54’0

This adhesive has the unique and interesting property of being relatively non-tacky when thoroughly dry so that it will not adhere to any other external surface, but will bond almost instantaneously to any surface which is also 25 coated with a dry film of the same adhesive.

Provided for insertion within the core of the coil B is a coreliner 6 which, for convenience in storage prior to use, is made from a rectangular sheet of kraft paper or plastic material folded lengthwise and overlapped in the 30 provision of a seam 7 to form a flattened tube as shown in Fig. 4. When desired, the latter can be opened out to the cylindrical form shown in Fig. 5. Since the diameter of the winding mandrel is standard in any steel mill, the core-liners can be made up to a predetermined size and ³⁵ will fit inside all rolls of steel wound thereon. However, the outside diametral size of the rolls may vary considerably depending upon the gauge of steel being wound and the number of turns applied to the roll. Consequently, the outer cover sheet 1 must be of such length as to cover 40 such variations within reasonable limits, which is the reason for the two transverse bands of adhesive 3, 5. On its inner surface and adjacent its outer edges the core-liner 6 is provided with annular bands of adhesive 8, 9, preferably of the same composition as the adhesive previously 45 described. Provided for covering the edges of the coil

B is a pair of flat circular side cover sheets 10, 11. As seen by reference to Fig. 3, the side cover sheet 10 is provided with a central aperture 12 surrounded by an adjacent circular band of adhesive 13 having a plurality of _eo circumferentially spaced slits 14 which extend radially outwardly from the aperture 12 to the edge of the band 13 At its outer edge and on both sides thereof, the side cover sheet 10 is provided with circular bands of adhesive 15, 15', which are also provided with a plurality of circum55 f^-r’cntially spaced slits 16 which extend radially outwardly from the inner edges of the bands 15, 15' to the outer periphery of the sheet 10. It is, of course, understood that the annular bands of adhesive 13, 15, 15', are preferably each formed of the composition previously described. If 60 desired, the several bands of adhesive on the outer cover sheet 1, core-liner 6, and side cover sheets 10, 11, may be protectively covered with conventional release paper which can be readily stripped therefrom.

In use, the outer cover sheet 1 is wrapped around the 65 outer surface of the coil B with the bands of adhesive 2, 3, 4, presented outwardly, and the adhesive band 5 is pressed against the band 3 to form a bonded lap-seam 17, as shown in Fig. 1. The core-liner 6 is then inserted while more or less flat within the core of the coil B and then opened out so as to conform to its inner contour. The side cover sheet 10 is then placed against the side

2,803,045 sive on the cover sheet and will also overlap and adhere to each other, thereby completely enclosing the coil.

3. A packaging cover for coiled sheet material, said cover comprising a core tube adapted for placement within the core of the coil, said core tube having a band of adhesive on its inner surface adjacent each end thereof, an outer cover sheet having one surface provided with a pair of spaced marginal bands of adhesive, means for forming said cover sheet into a tube conforming to the outer contour of the coil so that said one surface forms the outer surface of the tube with the bands of adhesive adjacent each side thereof, and a pair of side cover sheets adapted to cover the edges of the coil, said side cover sheets each being provided with an aperture surrounded by an adjacent annular band of adhesive, said band being provided with a plurality of slits extending radially thereacross, said side cover sheet furthermore being provided with an outer marginal band of adhesive having a plurality of slits extending thereacross, all of said aforementioned bands of adhesive being of the same composition and substantially non-tacky and adherent only to a film of like adhesive, whereby the slits permit the side covers to be folded so that the bands of adhesive adjacent the aperture will be presesd against and form a secure bond with the bands of adhesive on the core tube and the outer marginal bands of adhesive will be pressed against and form a secure bond with the bands of adhesive on the cover sheet and completely enclose the coil.

4. A packaging cover for coiled sheet material, said cover comprising a core tube adapted for placement within the core of the coil, said core tube having a band of adhesive on its inner surface adjacent each end thereof, an outer cover sheet having one surface provided with a pair of spaced marginal bands of adhesive, means for forming said cover sheet into a tube conforming to the outer contour of the coil so that said one surface forms the outer surface of the tube with the bands of adhesive adjacent each side thereof, and a pair of side cover sheets adapted to cover the edges of the coil, said side cover sheets each being provided with an aperture surrounded by an adjacent annular band of adhesive, said band being provided with a plurality of slits extending radially thereacross, said side cover sheet furthermore being provided with outer marginal bands of adhesive on the opposite surfaces thereof, said last mentioned bands of adhesive having a plurality of slits extending thereacross, all of said aforementioned bands of adhesive being substantially non-tacky and adherent only to a film of like adhesive, whereby the slits permit the side covers to be folded and form a plurality of segments so that the adhesive coated segments adjacent the aperture will be pressed against and form a secure bond with the bands of adhesive on the core tube and the adhesive coated segments at the outer margins will be pressed against and form a secure bond with the bands of adhesive on the cover sheet and will also overlap and adhere to each other, thereby completely enclosing the coil.

5. In a packaging cover for coiled sheet material, a circular side cover sheet having annular bands of adhesive on opposite surfaces thereof and adjacent its outer periphery, a plurality of radial slits extending across said bands of adhesive, said sheet having a central aperture surrounded by an annular band of adhesive, and a plurality of radial slits extending across said last mentioned band of adhesive.

6. In a packaging cover for coiled sheet material, an annular side cover sheet provided on its outer periphery with a plurality of outwardly extending segments, said segments having a coating of adhesive on both faces thereof, said cover sheet also being provided on its inner periphery with a plurality of inwardly projecting segments coated with adhesive on one face thereof.

7. In a packaging cover for coiled sheet material, an of the coil B and the slit band of adhesive 15 is folded and pressed against the band .4 on the outer cover sheet 1 to form a bond therewith, and similarly the slit band of adhesive 13 is folded and pressed against the band 9 on the corediner 6 to form a bond therewith. Since the 5 side cover sheet 11 is similar to the side cover sheet 10, it will be apparent that the side cover sheet 11 is applied in the same manner as the side cover sheet 10. The slits 14, 16, permit the bands of adhesive 13, 15, 15', to be readily folded without wrinkling or tearing so as to insure 10 an adequate bond between the side cover 10 and the outer cover sheet 1 and corediner 6, because the slits 14, 16, permit the bands 13, 15, 15', upon folding, to separate into a plurality of segments 18, 19, so that in the completed package the segments 18 are spaced from each 15 other while the segments 19 overlap each other. In this connection it should be noted that the adjacent overlapping portions of the segments 19 will adhere to each other due to the fact that the outer edge of the side cover 10 is formed with adhesive layers 15, 15', on each side 20 thereof. Similarly, the side cover sheet 11 forms spaced segments 20 and overlapping segments 21.

It should be understood that changes and modifications in the form, construction, arrangement, and combination of the several parts of the packaging covers for coiled ²⁵sheet material may be made and substituted for those herein shown and described without departing from the nature and principle of my invention.