EP0474094B1 - Apparatus for winding a wrapping sheet around a roll - Google Patents
Apparatus for winding a wrapping sheet around a roll Download PDFInfo
- Publication number
- EP0474094B1 EP0474094B1 EP19910114348 EP91114348A EP0474094B1 EP 0474094 B1 EP0474094 B1 EP 0474094B1 EP 19910114348 EP19910114348 EP 19910114348 EP 91114348 A EP91114348 A EP 91114348A EP 0474094 B1 EP0474094 B1 EP 0474094B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- wrapping sheet
- roll
- web roll
- winding
- chucks
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- 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
- B65B25/00—Packaging other articles presenting special problems
- B65B25/14—Packaging paper or like sheets, envelopes, or newspapers, in flat, folded, or rolled form
- B65B25/146—Packaging paper or like sheets, envelopes, or newspapers, in flat, folded, or rolled form packaging rolled-up articles
- B65B25/148—Jumbo paper rolls
Definitions
- This invention relates to an apparatus for winding a wrapping sheet around the outer peripheral surface of a roll.
- a wrapping sheet is wound around the outer peripheral surface of a roll by causing a pair of chucks to abut against respective end faces of the roll and rotating them as disclosed, for instance, in Japanese Unexamined Patent Publication No. 49(1974)-27390, disclosing a wrapping sheet winding apparatus according to the preamble of claim 1. Further, generally, the wrapping sheet is positioned relative to the roll so that marginal portion of the wrapping sheet extends beyond the side of the roll and then wound around the article in the manner described above in order to wrap also the end faces of the article.
- the wrapping sheet is apt to be displaced relative to the roll during the winding operation, and irregular folds or creases are frequently produced in the marginal portions of the wrapping sheet.
- the primary object of the present invention is to provide a wrapping sheet winding apparatus in which the wrapping sheet can be prevented from being displaced relative to the roll during the winding operation and production of irregular folds and creases in the marginal portions of the wrapping sheet can be suppressed and
- the marginal portions of the wrapping sheet extending beyond the sides of the roll are pulled against the outer peripheral surfaces of the chucks under suction force applied to the suction holes during winding operation, and accordingly the wrapping sheet can be prevented from being displaced relative to the roll during the winding operation and production of irregular folds and creases in the marginal portions of the wrapping sheet can be suppressed.
- the slack can be removed by pulling outward the wrapping sheet by moving outward the suction head portions of the chucks away from the chuck head portions.
- the wrapping sheet can be prevented from being displaced relative to the roll during the winding operation and production of irregular folds and creases in the marginal portions of the wrapping sheet can be suppressed even if the lengths and/or diameters of the rolls fluctuate.
- Such arrangement is especially effective for wrapping sheets which are relatively flexible.
- a wrapping sheet winding apparatus 10 in accordance with the present invention winds a wrapping sheet 8 around a web roll 6 which comprises a tubular core 2 and a web 4 of a predetermined length wound around the core 2.
- the apparatus 10 comprises a wrapping sheet supply system 12 for supplying a wrapping sheet 8 of a predetermined size, a web roll supply system (not shown) for supplying the web roll 6 and a sheet winding system 14 for winding the wrapping sheet 8 around the web roll 6.
- the wrapping sheet supply system 12 includes a cutter section 16 which cuts the wrapping sheet 8' in continuous length into a wrapping sheet 8 of a predetermined length longer than the width of the web 4 by a predetermined length, and a conveyor section 18 which clamps the wrapping sheet 8 and conveys it to the position shown in Figure 1 where one leading edge portion 8a of the wrapping sheet 8 rests on a pair of support rollers 20 of the sheet winding system 14.
- Reference numeral 18a denotes a clamp member which clamps the leading end of the wrapping sheet 8.
- the web roll supply system places the web roll 6 on the leading edge portion 8a of the wrapping sheet 8 resting on the support rollers 20 go that the wrapping sheet 8 extends beyond each side face of the web roll 6.
- the sheet winding system 14 has a pair of cylindrical chucks 22 which are adapted to be engaged with the core 2 of the web roll 6 to rotate the web roll 6.
- Each chuck 22 has an outer diameter smaller than the outer diameter of the web roll 6 (e,g., 1/2 to 11/12 of the outer diameter of the web roll 6), and a plurality of suction holes 24 are formed on the outer peripheral surface of the chuck 22.
- the chucks 22 are supported by a threaded rod 26 spaced from each other with their rotational axes in alignment With each other.
- the web roll 6 is placed on the wrapping sheet 8 in a position where the central axis of the web roll 6 is in alignment with the rotational axes of the chucks 22 as shown in Figure 2a.
- Each chuck 22 has a tapered head portion 22a and is supported by way of an air cylinder 22b to be driven toward and away from the web roll 6 by the cylinder 22b.
- the chucks 22 are driven toward the web roll 6 and the tapered head portions 22a thereof are brought into engagement with the ends of the core 2 as shown in Figure 2b. At this time the outer peripheral surfaces of the chucks 22 are opposed to the wrapping sheet 8 at a small distance therefrom.
- the sheet winding system 14 further includes a blower 28 disposed near the support rollers 20 ( Figure 3), and the blower 28 blows air to the leading edge portion 8a of the wrapping sheet 8 from below so that the leading portion 8a is pressed against the outer peripheral surface of the web roll 6 as shown in Figure 3.
- suction force is fed to the suction holes 24 of the chucks 22 through suction pipes 30, whereby marginal portions 8b which extend beyond the sides of the web roll 6 are pulled against the outer peripheral surfaces of the chucks 22 under suction force.
- the chucks 22 are smaller than the web roll 6 in diameter, the marginal portions 8b are pulled outward by the suction force, tightly fixing the leading portion 8a to the wrapping sheet itself.
- the chucks 22 are driven by belts 32 as shown in Figure 2c, whereby the web roll 6 is rotated and the wrapping sheet 8 is wound around the web roll 6. Since the marginal portions 8b are held on the outer peripheral surface of the chucks 22 under the suction force, the wrapping sheet 8 cannot be displaced relative to the web roll 6 during the winding operation. Further, since the wrapping sheet 8 is kept under tension during the winding operation due to the suction force applied to the marginal portions 8b and leading portion 8a as described above, irregular folds or creases cannot be produced in the leading portion 8a or the marginal portions 8b.
- the chucks 22 are substantially equal to the web roll 6 in diameter in order to smoothly wind the wrapping sheet 8 around the web roll 6.
- the wrapping sheet winding apparatus 11 comprises a wrapping sheet supply system 13 for supplying the wrapping sheet 8, a web roll supply system 17 for supplying the web roll 6 and a sheet winding system 15 for winding the wrapping sheet 8 around the web roll 6.
- the wrapping sheet supply system 13 includes a cutter section (not shown) which cuts the wrapping sheet 8' in continuous length into a wrapping sheet 8 of a predetermined length longer than the width of the web 4 by a predetermined length, and a conveyor section 19 which conveys it to the position shown in Figure 4a.
- the conveyor section 19 comprises a pair of conveyor rollers 42 and a sheet drawing mechanism 40 which clamps the leading end of the wrapping sheet 8 conveyed by the conveyor rollers 42 and draws the wrapping sheet 8 to a winding position as shown in Figure 6a.
- the sheet winding system 15 comprises a pair of cylindrical chucks 21 and a winding roller 38 which is longer than the web roll 6 and is movable toward and away from the web roll 6 held by the chucks 21 as will be described later.
- Each chuck 21 comprises a chuck head portion 25 which is adapted to be engaged with the core 2 of the web roll 6 and a suction head portion 23 provided with suction holes 24 on the outer peripheral surface thereof.
- Each chuck 21 is supported on an up-and-down frame member 36 by way of a cylinder member so that the central axes of the chucks are in alignment with each other.
- the chucks 21 are driven by the cylinder member 21a toward and away from the each other.
- the suction head portion 23 of each chuck 21 is smaller in diameter than the web roll 6. Further the suction head portion 23 of each chuck 21 is movable toward and away from the chuck head portion 25 along the central axis of the chuck 21.
- the web roll supply system 17 comprises a bucket conveyor 32 which feeds the web rolls 6 one by one.
- the up-and-down frame member 36 moves downward to a position where the chucks 21 are aligned with the web roll 6, and the chucks 21 are driven toward the web roll 6 and brought into engagement with the core 2 of the web roll 6, thereby holding the web roll 6 therebetween. Thereafter, the up-and-down frame member 36 moves upward to bring the web roll 6 to the position shown in Figure 4a and Figure 6a, where the web roll 6 is positioned close to the wrapping sheet 8 hanging from the conveyor rollers 42.
- Figure 5a shows the chucks 21, web roll 6 and the winding roller 38 in this state.
- the chucks 21 are rotated in the direction reverse to the winding direction to bring the leading edge of the wrapping sheet 8 on the contact line of the roller 38 and the web roll 6 as shown in Figure 5b.
- the suction head portions 23 of the chucks 21 are opposed to marginal portions 8b of the leading edge portion 8a of the wrapping sheet 8 at a small distance therefrom.
- each chuck 21 When the outer diameter of each chuck 21 is substantially equal to the outer diameter of the web roll 6 having a minimum diameter, all the web rolls 6 including wide range of outer diameters can be wrapped with the wrapping sheet 8 with a better appearance by sliding the suction head portions 23 by an appropriate distance.
- the wrapping sheet winding apparatus in accordance with the present invention is advantageous in that the wrapping sheet 8 is firmly held on the chucks and less air is trapped in the wrapping sheet and accordingly the wrapping sheet can be tightly wound around the web roll.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Basic Packing Technique (AREA)
- Packaging Of Special Articles (AREA)
Description
- This invention relates to an apparatus for winding a wrapping sheet around the outer peripheral surface of a roll.
- In the majority of the conventional wrapping sheet winding apparatus, a wrapping sheet is wound around the outer peripheral surface of a roll by causing a pair of chucks to abut against respective end faces of the roll and rotating them as disclosed, for instance, in Japanese Unexamined Patent Publication No. 49(1974)-27390, disclosing a wrapping sheet winding apparatus according to the preamble of claim 1. Further, generally, the wrapping sheet is positioned relative to the roll so that marginal portion of the wrapping sheet extends beyond the side of the roll and then wound around the article in the manner described above in order to wrap also the end faces of the article.
- However, in such conventional apparatuses, the wrapping sheet is apt to be displaced relative to the roll during the winding operation, and irregular folds or creases are frequently produced in the marginal portions of the wrapping sheet.
- Especially when the diameter or the width of the roll change, production of such irregular folds or creases becomes more remarkable due to change in the winding condition.
- In view of the foregoing observations and description, the primary object of the present invention is to provide a wrapping sheet winding apparatus in which the wrapping sheet can be prevented from being displaced relative to the roll during the winding operation and production of irregular folds and creases in the marginal portions of the wrapping sheet can be suppressed and
- to provide a wrapping sheet winding apparatus in which the wrapping sheet can be prevented from being displaced relative to the roll during the winding operation and production of irregular folds and creases in the marginal portions of the wrapping sheet can be suppressed even if the lengths and/or diameters of the articles fluctuate.
- In accordance with the present invention, this object is achieved by the features of the characterising portion of claim 1.
- The marginal portions of the wrapping sheet extending beyond the sides of the roll are pulled against the outer peripheral surfaces of the chucks under suction force applied to the suction holes during winding operation, and accordingly the wrapping sheet can be prevented from being displaced relative to the roll during the winding operation and production of irregular folds and creases in the marginal portions of the wrapping sheet can be suppressed.
- If slack is produced in the wrapping sheet due to fluctuation in the lengths and/or diameters of the articles when the marginal portions of the wrapping sheet extending beyond the sides of the roll are pulled against the outer peripheral surfaces of the chucks under suction force applied to the suction holes, the slack can be removed by pulling outward the wrapping sheet by moving outward the suction head portions of the chucks away from the chuck head portions.
- Thus in accordance with the invention, the wrapping sheet can be prevented from being displaced relative to the roll during the winding operation and production of irregular folds and creases in the marginal portions of the wrapping sheet can be suppressed even if the lengths and/or diameters of the rolls fluctuate. Such arrangement is especially effective for wrapping sheets which are relatively flexible.
-
- Figure 1 is a schematic perspective view showing a wrapping sheet winding apparatus in accordance with the present invention,
- Figures 2a to 2c are views as viewed in the direction of arrow II in Figure 1 for showing in detail the sheet winding system and for illustrating the operation of the same,
- Figure 3 is a fragmentary front view as viewed in the direction of arrow III in Figure 1,
- Figure 4a is a schematic perspective view showing details of a wrapping sheet winding apparatus in accordance with the present invention,
- Figure 4b is a fragmentary view as viewed in the direction of arrow IV in Figure 4a,
- Figures 5a to 5e are views similar to Figure 4b but showing different stages of the operation of the sheet winding system, and
- Figures 6a to 6c are side views for illustrating the operation of the wrapping sheet supply system.
- In Figure 1, a wrapping
sheet winding apparatus 10 in accordance with the present invention winds awrapping sheet 8 around aweb roll 6 which comprises atubular core 2 and aweb 4 of a predetermined length wound around thecore 2. Theapparatus 10 comprises a wrappingsheet supply system 12 for supplying awrapping sheet 8 of a predetermined size, a web roll supply system (not shown) for supplying theweb roll 6 and asheet winding system 14 for winding thewrapping sheet 8 around theweb roll 6. - The wrapping
sheet supply system 12 includes acutter section 16 which cuts the wrapping sheet 8' in continuous length into awrapping sheet 8 of a predetermined length longer than the width of theweb 4 by a predetermined length, and aconveyor section 18 which clamps thewrapping sheet 8 and conveys it to the position shown in Figure 1 where one leadingedge portion 8a of thewrapping sheet 8 rests on a pair ofsupport rollers 20 of thesheet winding system 14. Reference numeral 18a denotes a clamp member which clamps the leading end of thewrapping sheet 8. - The web roll supply system places the
web roll 6 on the leadingedge portion 8a of thewrapping sheet 8 resting on thesupport rollers 20 go that thewrapping sheet 8 extends beyond each side face of theweb roll 6. - The
sheet winding system 14 has a pair ofcylindrical chucks 22 which are adapted to be engaged with thecore 2 of theweb roll 6 to rotate theweb roll 6. Eachchuck 22 has an outer diameter smaller than the outer diameter of the web roll 6 (e,g., 1/2 to 11/12 of the outer diameter of the web roll 6), and a plurality ofsuction holes 24 are formed on the outer peripheral surface of thechuck 22. - As shown in Figures 2a to 2c, the
chucks 22 are supported by a threadedrod 26 spaced from each other with their rotational axes in alignment With each other. Theweb roll 6 is placed on thewrapping sheet 8 in a position where the central axis of theweb roll 6 is in alignment with the rotational axes of thechucks 22 as shown in Figure 2a. Eachchuck 22 has a tapered head portion 22a and is supported by way of anair cylinder 22b to be driven toward and away from theweb roll 6 by thecylinder 22b. After theweb roll 6 is placed on thewrapping sheet 8 in the manner described above, thechucks 22 are driven toward theweb roll 6 and the tapered head portions 22a thereof are brought into engagement with the ends of thecore 2 as shown in Figure 2b. At this time the outer peripheral surfaces of thechucks 22 are opposed to thewrapping sheet 8 at a small distance therefrom. - The
sheet winding system 14 further includes ablower 28 disposed near the support rollers 20 (Figure 3), and theblower 28 blows air to the leadingedge portion 8a of thewrapping sheet 8 from below so that the leadingportion 8a is pressed against the outer peripheral surface of theweb roll 6 as shown in Figure 3. At the same time, suction force is fed to thesuction holes 24 of thechucks 22 throughsuction pipes 30, wherebymarginal portions 8b which extend beyond the sides of theweb roll 6 are pulled against the outer peripheral surfaces of thechucks 22 under suction force. At this time, since thechucks 22 are smaller than theweb roll 6 in diameter, themarginal portions 8b are pulled outward by the suction force, tightly fixing the leadingportion 8a to the wrapping sheet itself. - Then the
chucks 22 are driven bybelts 32 as shown in Figure 2c, whereby theweb roll 6 is rotated and thewrapping sheet 8 is wound around theweb roll 6. Since themarginal portions 8b are held on the outer peripheral surface of thechucks 22 under the suction force, thewrapping sheet 8 cannot be displaced relative to theweb roll 6 during the winding operation. Further, since thewrapping sheet 8 is kept under tension during the winding operation due to the suction force applied to themarginal portions 8b and leadingportion 8a as described above, irregular folds or creases cannot be produced in the leadingportion 8a or themarginal portions 8b. - In the case when the
wrapping sheet 8 is hard, it is preferred that thechucks 22 are substantially equal to theweb roll 6 in diameter in order to smoothly wind thewrapping sheet 8 around theweb roll 6. - The present invention will further be described with reference to Figures 4 to 6, hereinbelow.
- The wrapping sheet winding apparatus 11 comprises a wrapping
sheet supply system 13 for supplying thewrapping sheet 8, a webroll supply system 17 for supplying theweb roll 6 and asheet winding system 15 for winding thewrapping sheet 8 around theweb roll 6. - The wrapping
sheet supply system 13 includes a cutter section (not shown) which cuts the wrapping sheet 8' in continuous length into awrapping sheet 8 of a predetermined length longer than the width of theweb 4 by a predetermined length, and a conveyor section 19 which conveys it to the position shown in Figure 4a. - That is, the conveyor section 19 comprises a pair of
conveyor rollers 42 and asheet drawing mechanism 40 which clamps the leading end of thewrapping sheet 8 conveyed by theconveyor rollers 42 and draws thewrapping sheet 8 to a winding position as shown in Figure 6a. - The
sheet winding system 15 comprises a pair ofcylindrical chucks 21 and awinding roller 38 which is longer than theweb roll 6 and is movable toward and away from theweb roll 6 held by thechucks 21 as will be described later. Eachchuck 21 comprises achuck head portion 25 which is adapted to be engaged with thecore 2 of theweb roll 6 and asuction head portion 23 provided withsuction holes 24 on the outer peripheral surface thereof. Eachchuck 21 is supported on an up-and-downframe member 36 by way of a cylinder member so that the central axes of the chucks are in alignment with each other. Thechucks 21 are driven by thecylinder member 21a toward and away from the each other. Thesuction head portion 23 of eachchuck 21 is smaller in diameter than theweb roll 6. Further thesuction head portion 23 of eachchuck 21 is movable toward and away from thechuck head portion 25 along the central axis of thechuck 21. - The web
roll supply system 17 comprises abucket conveyor 32 which feeds theweb rolls 6 one by one. - When a
web roll 6 is fed by thebucket conveyor 32, the up-and-downframe member 36 moves downward to a position where thechucks 21 are aligned with theweb roll 6, and thechucks 21 are driven toward theweb roll 6 and brought into engagement with thecore 2 of theweb roll 6, thereby holding theweb roll 6 therebetween. Thereafter, the up-and-downframe member 36 moves upward to bring theweb roll 6 to the position shown in Figure 4a and Figure 6a, where theweb roll 6 is positioned close to thewrapping sheet 8 hanging from theconveyor rollers 42. - Then the
winding roller 38 moves toward theweb roll 6 and presses thewrapping sheet 8 against theweb roll 6 as shown in Figure 6b. Figure 5a shows thechucks 21,web roll 6 and thewinding roller 38 in this state. - In this state, the
chucks 21 are rotated in the direction reverse to the winding direction to bring the leading edge of thewrapping sheet 8 on the contact line of theroller 38 and theweb roll 6 as shown in Figure 5b. At this time, thesuction head portions 23 of thechucks 21 are opposed tomarginal portions 8b of the leadingedge portion 8a of thewrapping sheet 8 at a small distance therefrom. - Then suction force is applied to the
suction head portion 23 and themarginal portions 8b are pulled against the outer peripheral surfaces of thechucks 22 under suction force. Thereafter thechucks 21 are rotated to wind thewrapping sheet 8 around theweb roll 6 by 1/2 to 11/12 of the circumference as shown in Figure 6c and 5c. Depending on the length and/or the diameter of theweb roll 6, slack (indicated at 8A in Figure 5c) can be produced in thewrapping sheet 8 between the ends of theweb roll 6 as shown in Figure 5c. Whensuch slack 8A is produced, thesuction head portions 23 are moved outward relative to thechuck head portion 25 as shown in Figure 5d, whereby thewrapping sheet 8 are pulled in opposite directions and theslack 8A is removed. Thereafter thechucks 21 are further rotated to wind thewrapping sheet 8 completely around theweb roll 6 as shown in Figure 5e. - As can be understood from the description above, by sliding the
suction head portions 23 by an appropriate distance, production of slack in thewrapping sheet 8 can be prevented even if the length and/or the diameter of theweb roll 6 to be wrapped changes, thereby preventing production of irregular folds or creases. - When the outer diameter of each
chuck 21 is substantially equal to the outer diameter of theweb roll 6 having a minimum diameter, all the web rolls 6 including wide range of outer diameters can be wrapped with thewrapping sheet 8 with a better appearance by sliding thesuction head portions 23 by an appropriate distance. - Further, the wrapping sheet winding apparatus in accordance with the present invention is advantageous in that the
wrapping sheet 8 is firmly held on the chucks and less air is trapped in the wrapping sheet and accordingly the wrapping sheet can be tightly wound around the web roll.
Claims (4)
- A wrapping sheet winding apparatus (11) for winding a wrapping sheet (8) around a roll (6) comprising a pair of chuck members (21, 22) which are drivingly engaged with a core (2) of the roll (6) and rotate the roll (6) to wind therearound the wrapping sheet (8) which is disposed on the roll (6) so that marginal portions (8b) of the wrapping sheet (8) extend beyond the respective side faces of the roll (6), characterised in that each of said chuck members (21) comprises a chuck head portion (25) engaged with said core (2) and a suction head portion (23) provided with suction holes (24), said suction head portion (23) being movable toward and away from the chuck head portion (25) and the roll (6) along the rotational axis of the chuck members (21).
- A wrapping sheet winding apparatus (11) as claimed in claim 1, characterised in that said suction head portion (23) is smaller in diameter than said web roll (6).
- A wrapping sheet winding apparatus (11) as claimed in claim 1 or 2, characterised by an air cylinder (22b) for moving each of the chuck members (21) toward and away from the roll (6).
- A wrapping sheet winding apparatus (11) as claimed in at least one of claims 1 to 3, characterised by a winding roller (38) which is movable toward and away from the web roll (6).
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP22478890 | 1990-08-27 | ||
JP224788/90 | 1990-08-27 | ||
JP34180/91 | 1991-02-28 | ||
JP3034180A JP2640579B2 (en) | 1990-08-27 | 1991-02-28 | Packaging sheet wrapping device |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0474094A1 EP0474094A1 (en) | 1992-03-11 |
EP0474094B1 true EP0474094B1 (en) | 1995-08-23 |
Family
ID=26372969
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19910114348 Expired - Lifetime EP0474094B1 (en) | 1990-08-27 | 1991-08-27 | Apparatus for winding a wrapping sheet around a roll |
Country Status (1)
Country | Link |
---|---|
EP (1) | EP0474094B1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
IT1284528B1 (en) * | 1996-09-13 | 1998-05-21 | Bf Engineering S R L | COILS PACKAGING PLANT |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2893190A (en) * | 1955-07-06 | 1959-07-07 | Williams & Wilson Ltd | Roll wrapping |
US3075325A (en) * | 1959-12-08 | 1963-01-29 | Hauni Werke Koerber & Co Kg | Method and apparatus for feeding wrapping material into a wrapping machine |
US3875723A (en) * | 1973-05-21 | 1975-04-08 | Conwed Corp | Wrapping apparatus for cylindrical shapes |
-
1991
- 1991-08-27 EP EP19910114348 patent/EP0474094B1/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
EP0474094A1 (en) | 1992-03-11 |
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