US3261901A - Method of molding a shoulder on a vertical mandrel - Google Patents

Method of molding a shoulder on a vertical mandrel Download PDF

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Publication number
US3261901A
US3261901A US269676A US26967663A US3261901A US 3261901 A US3261901 A US 3261901A US 269676 A US269676 A US 269676A US 26967663 A US26967663 A US 26967663A US 3261901 A US3261901 A US 3261901A
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United States
Prior art keywords
foil
mandrel
forming
shoulder
bend
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Expired - Lifetime
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US269676A
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English (en)
Inventor
Kopp Georg
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Schweizerische Industrie Gesellschaft
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Schweizerische Industrie Gesellschaft
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31C—MAKING WOUND ARTICLES, e.g. WOUND TUBES, OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31C3/00—Making tubes or pipes by feeding obliquely to the winding mandrel centre line
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B9/00—Enclosing successive articles, or quantities of material, e.g. liquids or semiliquids, in flat, folded, or tubular webs of flexible sheet material; Subdividing filled flexible tubes to form packages
    • B65B9/10—Enclosing successive articles, or quantities of material, in preformed tubular webs, or in webs formed into tubes around filling nozzles, e.g. extruded tubular webs
    • B65B9/20—Enclosing successive articles, or quantities of material, in preformed tubular webs, or in webs formed into tubes around filling nozzles, e.g. extruded tubular webs the webs being formed into tubes in situ around the filling nozzles
    • B65B9/22—Forming shoulders; Tube formers

Definitions

  • the present invention relates to formers for use in making tubes from strip material, such as cardboard, supplied from a roll.
  • Packaging machinery is often constructed wherein a packing tube is formed from a strip of material running off a roll, and this tube is then filled and processed into individual packages.
  • the strip of material is folded round a mandrel, a former or socalled forming shoulder guiding the strip through an angle greater than 270 onto the mandrel.
  • a forming shoulder has an interior concave cylindrical surface extending through it from one end to an opposite end, such cylindrical surface being of slightly larger diameter than the mandrel.
  • One edge of the cylindrical surface forms a folding edge curving smoothly from each side of a central portion thereof at the rear of the forming shoulder to the front of the shoulder and towards the opposite edge of the cylindrical surface.
  • a flat exterior rear surface of the shoulder is inclined at an acute angle to the axis of the cylindrical surface and extends to said central rear portion of the folding edge whilst convex exterior curvilinear side surfaces blend with the flat rear surface and extend therefrom forwardly to the remaining portions of the folding edge.
  • the strip material is fed along the fiat surface and over the curvilinear surfaces to the folding edge.
  • the material is bent through a sharp angle (over 270) and passes as a tube through the annular clearance space between the internal cylindrical surface and the mandrel which extends through the bore formed by this cylindrical surface.
  • the invention concerns a forming shoulder for the above stated purpose and a process by means of which these forming shoulders may be produced more quickly, more cheaply and above all more accurately than has hitherto been possible.
  • a method of making a forming shoulder includes the steps of arranging a cylindrical mandrel with its axis generally vertical; folding a foil in strip form about the cylindrical mandrel so that one end part of said foil is in tubular form about said mandrel, the other end portion of the foil is flat and inclined downwardly to the axis of the mandrel at the same angle as the strip material to be formed into a tube will be fed and the foil takes the general shape which will be assumed by the strip material being folded, a mould cavity thereby being formed about the foil portion in the form of a tube; casting a settable composition into said mould cavity to form a cast body; and removing said foil from said cast body to provide a forming shoulder.
  • the mandrel is enclosed by a sleeve which is covered with adhesive on the outside and the adhesive sleeve is covered by the tubular portion of the foil.
  • Said composition cast into the mould cavity is preferably one which solidifies practically without shrinkage.
  • a forming shoulder for forming strip material into a tube about a cylindrical mandrel has an interior concave cylindrical 3,261,901 Patented July 19, 1966 surface in a hole extending through said shoulder, one edge of said cylindrical surface being radiused to provide a folding edge which curves smoothly upwardly from each side of a central portion thereof at the rear of said shoulder to the front of said shoulder, a flat exterior rear surface inclined at an acute angle to the axis of said cylindrical surface and extending towards said central rear portion of said folding edge, convex exterior curvilinear side surfaces blending with said flat rear surface and extending therefrom towards said folding edge and an exterior border surface adjoining said radiused folding edge, said border surface blending with said curvilinear side surfaces and with said flat rear surface, and being slightly curved concave to said folding edge.
  • FIG. 1 is a side view of a folding mandrel around which is arranged a flexible foil which is folded to the form of a strip of material which is to be folded into a tube as it is being guided over the forming shoulder.
  • FIG. 2 is a front perspective view of the mandrel and the foil, the cavity in the foil having been filled with a settable composition
  • FIG. 3 is a plan view corresponding to FIG. 2.
  • FIG. 4 is a front perspective view of the forming shoulder which has been cast in the cavity.
  • FIG. 5 is a rear perspective view of the shoulder
  • FIG. 6 is section to a larger scale through the folding edge of the forming shoulder on the line VIVI in FIG. 4;
  • FIG. 7 is a plan view similar to FIG. 2, but of another embodiment before the cavity is filled;
  • FIG. 8 shows an aluminum foil provided with transverse ridges
  • FIG. 9 is a rear perspective view of a shoulder cast in a cavity formed by the ribbed foil of FIG. 8;
  • a mandrel 1 which is either the mandrel used in a packaging machine itself or a mandrel of the same diameter, is enclosed by a cardboard sleeve 2 which is covered with adhesive on the outside. If the packaging tube which is to be produced by means of the forming shoulder to be made is to have an overlapping longitudinal seam, then the longitudinal edges 10, 11 of the cardboard sleeve will also be made to overlap, as shown in FIGS. 2 and 3.
  • the foil 3 is preferably cut to the same width as the cardboard of the sleeve 2 so that when its end portion 15 is wound round the sleeve, its longitudinal edges 16, 17 will be flush with the overlapping longitudinal edges 10, 11 of the sleeve 2.
  • the lower end of the tubular or cylindrical portion 15 terminates a told 19 which extends smoothly upwardly from a central rear portion 19a to the lateral edges 16 and 17.
  • the other end portion 18 of the foil 3 forms a flat rear portion at angle a to the axis of the mandrel 1, when the foil 3 is curved round the mandrel and extends downwardly inwardly towards the central rear fold portion 19a.
  • Curvilinear side portions 20 and 21 of the foil 3 blends with the fiat rear portion 18 and extends forwardly and downwardly towards the bend 19.
  • a cavity 4 is formed around the mandrel 1 and the sleeve 2 and since the foil 3 takes the shape of thestripof packaging material running into the packaging machine when it is being folded into a tube, this cavity 4 formed by the foil 3 can be used as a mould cavity, for casting a forming shoulder.
  • a border file portion 22 adjoining the blend 19 blends with the curvilinear portions 20 and 21 and with the lowermost part 180 of the fiat foil portion 18.
  • the border portion is curved slightly concave downwardly towards the bend 19 with a radius R
  • the bend 19 itself is not absolutely sharp but has a radius R
  • the radii R and R depend on the thickness of the aluminum foil, which may be about 0.08 to 0.10 mm. These radii of curvature vary over the whole length of the bend 19 and are determined by the balancing of the internal stresses in the foil 3, so that a practical ideal casting cavity is obtained.
  • the cavity 4 is now filled with a settable composition which solidifies without any marked shrinkage.
  • Synthetic materials are preferably used for this purpose; for example acrylates, nylon and epoxy resins have been found satisfactory.
  • the casting process may be carried out either by simply filling the cavity 4 up to its edge with liquid synthetic resin 5, as shown in FIGS. 2 and 3, in which case it may be advantageous to add filler to the synthetic resin, or the synthetic resin may be applied in layers or sprayed in or applied by some other suitable process.
  • FIGS. 4 and 5 show a forming shoulder 25 produced as described above.
  • This shoulder has an internal concave cylindrical surface 26, a fiat rear surface 27 inclined to the axis of the cylindrical surface 26 at the angle on and curvilinear side surfaces 28 and 29 produced by the corresponding portions 15, 18, 20 and 21 of the foil 3.
  • the curvilinear side surfaces 20 and 21 blend with the rear surface 18 and extend forwardly and downwardly towards a folding edge 30 forming the lower edge of the cylindrical surface 26.
  • the fiat rear surface 27 extends downwardly inwardly towards the folding edge 30.
  • this shoulder has a border surface 31 adjoining the folding edge and blending with the curvilinear side portions 28 and 29 and with the lowermost part 27a of the flat portion 27.
  • This border surface 31 is slightly concave downwardly towards the edge 30 with the radius R of the corresponding border portion 22 of the foil.
  • the edge 30 itself has the radius R of the corresponding bend 19 of the foil.
  • the folding edge 30 considerably improves the guiding of the oncoming strip of packaging material compared with that achieved with the prior art forming shoulders, so that even packaging materials of extremely low stretchability, e.g. backed aluminum foils, can be worked by the forming shoulder perfectly satisfactorily and without any subsequent work on the forming shoulder.
  • the forming shoulder may either be fixed directly to the folding mandrel of the packaging machine or it may be used as a pattern for producing moulds from which any number of forming shoulders may be produced.
  • the foil 3 may be suitably treated, e.g. it may be reinforced from outside by means of synthetic resins or metals, so that it may itself be used as a master mould for the production of any number of forming shoulders.
  • the thickness of the cardboard used for the sleeve 2 may be selected according to the thickness of the strip of packaging material to be folded. If necessary, the mandrel 1 used for the production of the forming shoulder may have a slightly greater diameter than the mandrel used in the packing machine. Furthermore, the angle 0: may be adjusted to the thickness and type of packaging material. It is usually about 30 to In cases wherein the packaging tube produced by the shoulder is to have a longitudinal seam which projects radially from the tube the longitudinal edges 12, 13 of A the cardboard sleeve 14 are arranged to project radially from the mandrel 1 as shown in FIG. 7. In this case also the longitudinal edges 32, 33 of the tubular portion 34 of the foil 35 are in register with the cardboard edges 12, 13.
  • the foil shape of FIG. 7 is otherwise the same as that of FIGS. 1. to 3.
  • a foil 36 provided with ridges 37 as shown in FIG. 8 is folded about the mandrel, the forming shoulder 38 produced by casting in the cavity formed by folding the foil about a mandrel as in FIGS. 1 to 3 will have corresponding ribs 39 which may, for example, run transversely to the direction in which the strip of packaging material is to move forward as shown in FIG. 9.
  • Only the portion 40 of the foil 36 which is to be made tubular is free from ridges 39. Both that portion 41 which will remain flat and those portions 42 and 43 which are to become curvilinear are ridged.
  • these ribs 39 considerably reduce the surface of contact and hence the frictional resistance of the strip and on the other hand, for example in the case of polyethylene, it reduces the electrostatic charge.
  • the necessary mounting or securing members may advantageously be cast directly into the shoulder.
  • a method of shaping and molding a forming shoulder for forming strip material into a tube about a cylindrical mandrel the steps of applying a cylindrical adhesive sleeve to said mandrel to form a support with its axis generally vertical; folding a flexible foil in strip form about the sleeve, bending said foil upwardly from its lower edge into the shape which will be assumed by the strip material being folded to form a mold wall offset from said mandrel axis, such shape including a tubular mold wall portion about said mandrel formed with a bend at the lower end of said tubular portion and formed by bending the foil upwardly, and a fiat rear portion inclined upwardly from said bend at an acute angle to the mandrel axis towards said bend, said molds forming a mould cavity between said folded foil and said tubular foil portion; casting a settable composition into said mould cavity to form a cast body; permitting setting of said composition and removing said foil from said cast body to provide a forming shoulder.
  • a method of shaping and molding a forming shoulder for forming strip material into a tube about a cylindrical mandrel the steps of applying a cylindrical sleeve with its axis generally vertical; folding a flexible foil in strip form about said sleeve, bending said foil upwardly to form inner and outer mold walls and into the shape which will be assumed by the strip material being folded, such shape including a tubular portion about said mandrel forming said inner wall, the upwardly bending of the lower portion of said foil forming a bend at the lower end of said tubular portion, with a flat rear wall portion inclined upwardly from said bend at an acute angle to the mandrel axis away from said bend, said walls forming a mould cavity between said upwardly folded foil and said tubular foil portion; casting a settable composition into said mould cavity to form a cast body, said composition having the property that it is substantially non-shrinking upon solidification; and removing said foil from said cast body to provide a forming shoulder.
  • a method of shaping and molding a forming shoulder for forming strip material into a tube about a cylindrical mandrel the steps of positioning a cylindrical mandrel with its axis generally vertical; applying a sleeve to said mandrel; adhesively securing a strip of foil material to a portion of said sleeve, folding said foil in strip form about said sleeve, bending said foil upwardly from its lower end to form mold walls and of a shape after the strip material is folded, such shape including a tubular portion, a bend at the lower end of said tubular portion and a flat rear portion inclined upwardly from said bend at an acute angle to the mandrel axis, the bending of said foil forming a mould cavity in said folded foil about said tubular foil portion; casting a settable composition into said mould cavity to form a cast body; permitting said composition to set, and removing said foil from said cast body to provide a forming shoulder.
  • a method of shaping and molding a forming shoulder for forming strip material into a tube about a cylindrical mandrel the steps of arranging a cylindrical mandrel with its axis generally vertical; wrapping a foil in strip form about the cylindrical mandrel, folding the lower portion of said foil upwardly to form a cylindrical portion wrapped around said mandrel and an offset wall portion spaced therefrom, said cylindrical portion having a front longitudinal seam formed by juxtaposed lateral edge portions of the foil, bending the lower end of said cylindrical portion upwardly to form a mould cavity, said bend curving smoothly forwardly upwardly from each side of a central rear portion thereof to the lower end of said seam, a flat rear portion inclined at an acute angle to the mandrel axis downwardly towards said central rear portion of said bend and convex curvilinear portions blending with said fiat rear portion and extending therefrom forwardly and downwardly to said bend, a mould cavity thereby being formed exteriorly of said cylindrical foil portion but interiorly of said fiat rear and curvilinear side
  • a method of shaping and molding a forming shoulder for forming strip material into a tube about a cylindrical mandrel the steps of arranging a cylindrical mandrel with its axis generally vertical; wrapping a foil in strip form about the cylindrical mandrel, folding the lower portion of said foil upwardly to form a cylindrical portion wrapped around said mandrel and an eccentric curved portion, said cylindrical portion having a front longitudinal seam formed by juxtaposed lateral edge portions of the foil, said folding step forming a radiused bend at the lower end of said cylindrical portion with said bend curving smoothly forwardly upwardly from each side of a central rear portion thereof to the lower end of said seam, said bending and folding step also forming a Hat rear portion inclined at an acute angle to the mandrel axis downwardly towards said central rear portion of said bend with convex curvilinear portions blending with said flat rear portion and extending therefrom forwardly and downwardly towards said bend and a border portion adjoining said bend, said foil being bent so that the same will form a border
  • a method of shaping and molding a forming shoulder for forming strip material into a tube about a cylindrical mandrel the steps of positioning a cylindrical mandrel with its axis generally vertical; applying a foil in strip form about the cylindrical mandrel, folding and bending said foil upwardly from its lower edge to form a cylindrical mold wall portion wrapped around said mandrel and an eccentric mold wall portion, said cylindrical portion having a front longitudinal seam formed by juxtaposed lateral edge portions of the foil, said folding step forming a bend at the lower end of said cylindrical portion curving smoothly forwardly upwardly from each side of a central rear portion thereof to the lower end of said seam with a flat rear portion inclined upwardly at an acute angle to the mandrel axis and downwardly towards said central rear portion of said bend with a convex curvilinear surface blending with said flat rear portion and extending therefrom forwardly and downwardly towards said bend and a border portion said bend and blending with said curvilinear side portions, said bend being radiused and said border portion

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Making Paper Articles (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)
US269676A 1962-04-03 1963-04-01 Method of molding a shoulder on a vertical mandrel Expired - Lifetime US3261901A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH403962A CH399286A (de) 1962-04-03 1962-04-03 Formschulter zum Formen von streifenförmigem Material zu einem einen Dorn umschliessenden Verpackungsschlauch und Verfahren zu deren Herstellung

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US3261901A true US3261901A (en) 1966-07-19

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US269676A Expired - Lifetime US3261901A (en) 1962-04-03 1963-04-01 Method of molding a shoulder on a vertical mandrel

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CH (1) CH399286A (de)
GB (1) GB965876A (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3370517A (en) * 1965-06-21 1968-02-27 Dow Chemical Co Apparatus for forming tubular film
US4478774A (en) * 1982-09-30 1984-10-23 Yee Tin B Method for repairing heels of shoes

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITMI20120388A1 (it) * 2011-03-17 2012-09-18 Tna Australia Pty Ltd Dispositivo di formatura per confezionatrice

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2662248A (en) * 1951-02-10 1953-12-15 Goodyear Aircraft Corp Method of forming molds for casting thermosetting transparent enclosures
US2708773A (en) * 1951-08-06 1955-05-24 Herman W Richter Method for making molds
US2810935A (en) * 1956-07-09 1957-10-29 Oleg E Gaydebouroff Shoe lift and method of making same
US3122072A (en) * 1963-03-15 1964-02-25 Sperry Rand Corp Tube former insert
US3125008A (en) * 1964-03-17 Apparatus for converting a web into tubular form

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3125008A (en) * 1964-03-17 Apparatus for converting a web into tubular form
US2662248A (en) * 1951-02-10 1953-12-15 Goodyear Aircraft Corp Method of forming molds for casting thermosetting transparent enclosures
US2708773A (en) * 1951-08-06 1955-05-24 Herman W Richter Method for making molds
US2810935A (en) * 1956-07-09 1957-10-29 Oleg E Gaydebouroff Shoe lift and method of making same
US3122072A (en) * 1963-03-15 1964-02-25 Sperry Rand Corp Tube former insert

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3370517A (en) * 1965-06-21 1968-02-27 Dow Chemical Co Apparatus for forming tubular film
US4478774A (en) * 1982-09-30 1984-10-23 Yee Tin B Method for repairing heels of shoes

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Publication number Publication date
GB965876A (en) 1964-08-06
CH399286A (de) 1966-03-31

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