CA1059095A - Plastic core for paper rolls or the like - Google Patents
Plastic core for paper rolls or the likeInfo
- Publication number
- CA1059095A CA1059095A CA264,673A CA264673A CA1059095A CA 1059095 A CA1059095 A CA 1059095A CA 264673 A CA264673 A CA 264673A CA 1059095 A CA1059095 A CA 1059095A
- Authority
- CA
- Canada
- Prior art keywords
- thin
- ribs
- walled
- core
- cylindric
- 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
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H75/00—Storing webs, tapes, or filamentary material, e.g. on reels
- B65H75/02—Cores, formers, supports, or holders for coiled, wound, or folded material, e.g. reels, spindles, bobbins, cop tubes, cans, mandrels or chucks
- B65H75/04—Kinds or types
- B65H75/08—Kinds or types of circular or polygonal cross-section
- B65H75/10—Kinds or types of circular or polygonal cross-section without flanges, e.g. cop tubes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2701/00—Handled material; Storage means
- B65H2701/50—Storage means for webs, tapes, or filamentary material
- B65H2701/51—Cores or reels characterised by the material
- B65H2701/512—Cores or reels characterised by the material moulded
- B65H2701/5122—Plastics
Landscapes
- Storage Of Web-Like Or Filamentary Materials (AREA)
Abstract
ABSTRACT
A plastics core for use in a paper or plastic sheet roll, e.g. for a cash register or the like paper rolls, is produced by cutting an indeterminate length of an extrusion molded, unitary, tubular structure to a predetermined length. The tube or the core comprises two concentric, radially spaced, thin-walled cylindric members and a plurality of preferably radial, thin ribs maintaining the cylindric members at their radial spacing. The core is lighter than known cores, can easily be produced by slicing an extrusion molded product and has an increased dimensional stability.
A plastics core for use in a paper or plastic sheet roll, e.g. for a cash register or the like paper rolls, is produced by cutting an indeterminate length of an extrusion molded, unitary, tubular structure to a predetermined length. The tube or the core comprises two concentric, radially spaced, thin-walled cylindric members and a plurality of preferably radial, thin ribs maintaining the cylindric members at their radial spacing. The core is lighter than known cores, can easily be produced by slicing an extrusion molded product and has an increased dimensional stability.
Description
The present invention relates to an annular core for use in supporting rolls of flat strips of material such as paper, plastics, adhesive tape or the like rolls. The core is particularly suitable for but not limited to the use in paper rolls used in adding machines, cash registers or the like.
The cores for paper or the like flat strip rolls are mainly produced from paper by lamination. The paper cores suffer from drawback of a relatively low strength which makes the cores subject to mechanical damage both prior to and following the winding of paper or the like thereon, with the resulting inaccuracies of the inside diameter of such cores which often renders the wound roll useless due to a relatively close toler-ances between the inside diameter of the core and the outside diameter of the roll supporting pin or shaft used in the particular machine. A typdcal example of such cores is disclosed in Canadian patent 679,952 issued February 11, 1964 to Wicklund, or Canadian patent 463,345 issued February 21, 1950 to Blanchet. Paper cores of this type frequently require the use of special end caps to protect the ends of the core from mechanical damage, the end caps presenting additional manufact~ring costs. Another problem associated with the use of paper cores is caused by dimensional changes of same caused by variations in air humidity as the mass of the core tends to expand in a more humid environment thus often rendering the inside diameter of the core too small and no longer rotatable about its supporting shaft or pin in the cash resister or the like. In order to avoid the latter draw-back, it has been proposed to manufacture e.g. textile bobbins from a plastics material (Canadian patent 352,838 issued September 3, 1935 to Dreyfus~. However, the known plastics cores have pro-ven to be relatively expensive as they are mainly injection moulded products of a predetermined length suitable for only one width of the paper roll. Moreover, even though the prob~em due -1- q~k 1~59095 to the variations in air humidity are a~oided, the problems of relatively low overall strength and resistance to damage are still present in the ~nown plastic cores. The kno~n plastic cores are relatively massive and require a relatively high volume of thermoplastic material, which has nowadays become a relatively expensive commodity. Accordingly, virtually all of the known types of plastics cores have been abandoned and the ald known paper rolls re-introduced in the market.
It is an object of the present invention to overcome the above drawbacks by using a tubular core in the form of a plastics tube which would not only possess the above advantages of plastics cores but would also be relatively inexpensive to produce, would have a light weight and would be dimensionally stable both prior to and after the winding of a paper or the like strip forming the roll. Another object of the present invention is to produce a core which can be manufactured from a relatively long tube of indeterminate length by slicing the tube into a predetermined length to produce the core. The present invention is particularly concerned with the solving of the problem of produoing a tube which, on the one hand, is dimensionally stable - and, on the other hand, is relatively easy to slice into said individual cores, without distorting the shape of the tubular structure.
According to the invention, a tube is pr~vided for producing, by slicing, a plurality of annular cores for use in supporting rolls of flat strips of material such as paper, plastics, adhesive tape or the like. The tube is a unitary, extrusion moulded, thin-walled tubular structure comprising a radially outside, generally cylindric wall, a radially inside, generally cylindric wall concentric with and radially spaced from said outside wall, and a plurality of thin-walled spacing ribs unitary with both cylindric walls, said spacing ribs extending generally parallel with axial elongation of the core and being generally equidistantl~ spaced from each other about said annular space.
Thus, the present invention facilitates the production of an annular core for use in supportingrolls such as paper rolls or the like for use in adding machines, cash registers, etc., the structural features of the core being identical tothose of the above mentioned tube. The ribs are preferably of the same -thicXness as the walls and extend in a generally radial direction relative to the concentric tubular walls.
The tube according to the present invention ean easily be sliced or cut into a plurality of cores, mainly due to its relatively low cross-cectional mass which is achieved by a thin-walled overall structure, the term "thin-walled" in this context meaning that the thickness of walls of the tu~e, be it the outer or the inner cylindric wall or the ribs, as will be described hereinafter, is in the size as described. It has been found that the radial arrangement of the ribs is preferable as it not only su~fices from the standpoint of strength but also requires less plastics material and thus reduces the overall weight of the core or of the tube. Generally, the thickness of the core and walls of ribs may be well below 1 millimeter, with the out-side diameter of the core varying in dependence on the proposed use.
The invention will now be described by way of examples with reference to the accompanying drawings in which Figure 1 is a perspective view of a paper:roll wound on a core of the present invention;
Figure 2 is a side view partly in section, of a tube from which the cores of the present invention can be produced; and Figure 3 is an end Yiew of the tube of figure 2.
In the drawings, the corresponding parts of the tube in figures 2 and 3 are referred with the same reference numerals lOS9095 as the portions of the sliced core sho~n in figure l.
The embodiment shown in figure 1 is a unitary core 1 from nylon Ctrademark~ and produced by extrusion moulaing of a tube l' ~figures 2 and 3~ of an indeterminate length and by subsequent cutting of same to produce the required length of the core 1. The core l, as well a~ the tube l' r consists of a thin-walled inner tube or cylindric member 4 f~m whos-e outside surface protrudes a plurality of radial ribs 6 whose outside ends are coincident with the inside ~urface of an outer cylindric member 2. The core is shown in use with a roll 8 of a paper, figure l showing such roll ready for application in a cash reg-ister.
The shown embodiment of the core has a 25 mm outside diameter, 18 mm inside diameter, the thickness of the cylindric walls being about 0.5 mm and that of the ribs amounting to about 0.9 mm. It is to be appreciated, however, that the dimensions as outlined above refer to one embodiment only and may vary depending on the in~ended use of the core. Thus, another useful embodiment has the size of about 22 mm outside diameter, 12 mm inside diameter, with the thickness of both the cylindric walls and the ribs being about 0.3 mm. The above goneral proportions have been found as an optimum ~rom the stand_ point of a compromise dictated, on the one hand,by the req_ uirement of dimensional stability and,on the other hand, by the required volume of the plastics material necessary for producing the tube. There are 12 equidistantly spaced radial ribs in both embodiments, even though it is to be appreciated that the number of the ribs may vary. The radial arrangement of the ribs is preferred as it was found that it satisfies the requirement of strength of the overall structure even with an extremely thin rib, the thin ri~ in turn being of advantage from the stand-point of cost of production and from the standpoint of producing the cores by cutting or slicing the tube.
Those skilled in the art will readily conceive further embodiments of the present invention differing from the embodiments referred to above but still falling within the scope of the present invention as defined in the accompanying claims.
The cores for paper or the like flat strip rolls are mainly produced from paper by lamination. The paper cores suffer from drawback of a relatively low strength which makes the cores subject to mechanical damage both prior to and following the winding of paper or the like thereon, with the resulting inaccuracies of the inside diameter of such cores which often renders the wound roll useless due to a relatively close toler-ances between the inside diameter of the core and the outside diameter of the roll supporting pin or shaft used in the particular machine. A typdcal example of such cores is disclosed in Canadian patent 679,952 issued February 11, 1964 to Wicklund, or Canadian patent 463,345 issued February 21, 1950 to Blanchet. Paper cores of this type frequently require the use of special end caps to protect the ends of the core from mechanical damage, the end caps presenting additional manufact~ring costs. Another problem associated with the use of paper cores is caused by dimensional changes of same caused by variations in air humidity as the mass of the core tends to expand in a more humid environment thus often rendering the inside diameter of the core too small and no longer rotatable about its supporting shaft or pin in the cash resister or the like. In order to avoid the latter draw-back, it has been proposed to manufacture e.g. textile bobbins from a plastics material (Canadian patent 352,838 issued September 3, 1935 to Dreyfus~. However, the known plastics cores have pro-ven to be relatively expensive as they are mainly injection moulded products of a predetermined length suitable for only one width of the paper roll. Moreover, even though the prob~em due -1- q~k 1~59095 to the variations in air humidity are a~oided, the problems of relatively low overall strength and resistance to damage are still present in the ~nown plastic cores. The kno~n plastic cores are relatively massive and require a relatively high volume of thermoplastic material, which has nowadays become a relatively expensive commodity. Accordingly, virtually all of the known types of plastics cores have been abandoned and the ald known paper rolls re-introduced in the market.
It is an object of the present invention to overcome the above drawbacks by using a tubular core in the form of a plastics tube which would not only possess the above advantages of plastics cores but would also be relatively inexpensive to produce, would have a light weight and would be dimensionally stable both prior to and after the winding of a paper or the like strip forming the roll. Another object of the present invention is to produce a core which can be manufactured from a relatively long tube of indeterminate length by slicing the tube into a predetermined length to produce the core. The present invention is particularly concerned with the solving of the problem of produoing a tube which, on the one hand, is dimensionally stable - and, on the other hand, is relatively easy to slice into said individual cores, without distorting the shape of the tubular structure.
According to the invention, a tube is pr~vided for producing, by slicing, a plurality of annular cores for use in supporting rolls of flat strips of material such as paper, plastics, adhesive tape or the like. The tube is a unitary, extrusion moulded, thin-walled tubular structure comprising a radially outside, generally cylindric wall, a radially inside, generally cylindric wall concentric with and radially spaced from said outside wall, and a plurality of thin-walled spacing ribs unitary with both cylindric walls, said spacing ribs extending generally parallel with axial elongation of the core and being generally equidistantl~ spaced from each other about said annular space.
Thus, the present invention facilitates the production of an annular core for use in supportingrolls such as paper rolls or the like for use in adding machines, cash registers, etc., the structural features of the core being identical tothose of the above mentioned tube. The ribs are preferably of the same -thicXness as the walls and extend in a generally radial direction relative to the concentric tubular walls.
The tube according to the present invention ean easily be sliced or cut into a plurality of cores, mainly due to its relatively low cross-cectional mass which is achieved by a thin-walled overall structure, the term "thin-walled" in this context meaning that the thickness of walls of the tu~e, be it the outer or the inner cylindric wall or the ribs, as will be described hereinafter, is in the size as described. It has been found that the radial arrangement of the ribs is preferable as it not only su~fices from the standpoint of strength but also requires less plastics material and thus reduces the overall weight of the core or of the tube. Generally, the thickness of the core and walls of ribs may be well below 1 millimeter, with the out-side diameter of the core varying in dependence on the proposed use.
The invention will now be described by way of examples with reference to the accompanying drawings in which Figure 1 is a perspective view of a paper:roll wound on a core of the present invention;
Figure 2 is a side view partly in section, of a tube from which the cores of the present invention can be produced; and Figure 3 is an end Yiew of the tube of figure 2.
In the drawings, the corresponding parts of the tube in figures 2 and 3 are referred with the same reference numerals lOS9095 as the portions of the sliced core sho~n in figure l.
The embodiment shown in figure 1 is a unitary core 1 from nylon Ctrademark~ and produced by extrusion moulaing of a tube l' ~figures 2 and 3~ of an indeterminate length and by subsequent cutting of same to produce the required length of the core 1. The core l, as well a~ the tube l' r consists of a thin-walled inner tube or cylindric member 4 f~m whos-e outside surface protrudes a plurality of radial ribs 6 whose outside ends are coincident with the inside ~urface of an outer cylindric member 2. The core is shown in use with a roll 8 of a paper, figure l showing such roll ready for application in a cash reg-ister.
The shown embodiment of the core has a 25 mm outside diameter, 18 mm inside diameter, the thickness of the cylindric walls being about 0.5 mm and that of the ribs amounting to about 0.9 mm. It is to be appreciated, however, that the dimensions as outlined above refer to one embodiment only and may vary depending on the in~ended use of the core. Thus, another useful embodiment has the size of about 22 mm outside diameter, 12 mm inside diameter, with the thickness of both the cylindric walls and the ribs being about 0.3 mm. The above goneral proportions have been found as an optimum ~rom the stand_ point of a compromise dictated, on the one hand,by the req_ uirement of dimensional stability and,on the other hand, by the required volume of the plastics material necessary for producing the tube. There are 12 equidistantly spaced radial ribs in both embodiments, even though it is to be appreciated that the number of the ribs may vary. The radial arrangement of the ribs is preferred as it was found that it satisfies the requirement of strength of the overall structure even with an extremely thin rib, the thin ri~ in turn being of advantage from the stand-point of cost of production and from the standpoint of producing the cores by cutting or slicing the tube.
Those skilled in the art will readily conceive further embodiments of the present invention differing from the embodiments referred to above but still falling within the scope of the present invention as defined in the accompanying claims.
Claims (2)
1. A core for use in rolls of flat strips of material such as paper, adhesive tape or the like, said core being of the type of an integral plastics product, whose outside diameter is about 20 mm to about 25 mm, said core being composed solely of:
(a) a thin-walled inside cylindric section whose thickness is about 0.3 to about 0.9 mm and whose outer surface is coincident with inside root sections of a plurality of radially outwardly protruding, thin-walled ribs, the ribs being each of a thickness generally corresponding to the said thickness of the inside cylindric section;
(b) the radially outside root sections of the respective thin-walled ribs being coincident with radially inside surface of a thin-walled outside cylindric section whose thickness is generally the same as that of said inside cylindric section;
(c) said inside tubular section and said outside tubular section being solid and concentric with each other and having an identical axial length, such that the respective axial ends thereof are each coincident with an end plane disposed radially with respect to the cylindric sections;
(d) each of said thin-walled ribs being a solid, rectangular, generally planar rib including two straight, axially opposite end edges each extending the entire axial length of the respective rib and being coincident with the respective end plane and with the respective axial ends of both of said tubular sections;
(e) the surfaces of any of said cylindric wall sections and of said ribs being perpendicular to said end surfaces at any point of said sections;
whereby radial cross-sections of the core are identical throughout the length of the core.
(a) a thin-walled inside cylindric section whose thickness is about 0.3 to about 0.9 mm and whose outer surface is coincident with inside root sections of a plurality of radially outwardly protruding, thin-walled ribs, the ribs being each of a thickness generally corresponding to the said thickness of the inside cylindric section;
(b) the radially outside root sections of the respective thin-walled ribs being coincident with radially inside surface of a thin-walled outside cylindric section whose thickness is generally the same as that of said inside cylindric section;
(c) said inside tubular section and said outside tubular section being solid and concentric with each other and having an identical axial length, such that the respective axial ends thereof are each coincident with an end plane disposed radially with respect to the cylindric sections;
(d) each of said thin-walled ribs being a solid, rectangular, generally planar rib including two straight, axially opposite end edges each extending the entire axial length of the respective rib and being coincident with the respective end plane and with the respective axial ends of both of said tubular sections;
(e) the surfaces of any of said cylindric wall sections and of said ribs being perpendicular to said end surfaces at any point of said sections;
whereby radial cross-sections of the core are identical throughout the length of the core.
2. A plastics tube for producing a plurality of cores for use in rolls of flat strips of material such as paper, adhesive tape or the like, said cores being each of the type of an integral, one-piece molded plastics product, said tube having an outside diameter of about 20 mm to about 25 mm and being composed solely of:
(a) a thin-walled inside cylindric section whose thickness is about 0.3 to about 0.9 mm and whose outer surface is coincident with inside root sections of a plurality of generally radially outwardly protruding, thin-walled ribs, the ribs being each of a thickness generally corresponding to the said thickness of the inside cylindric section;
(b) the radially outside root sections of the respective thin-walled ribs being coincident with radially inside surface of a thin-walled outside cylindric section;
(c) said inside tubular section and said outside tubular section being solid and concentric with each other and having a generally identical axial length;
(d) each of said thin-walled ribs being a solid, generally rectangular and planar rib extending the entire axial length of the tube;
(e) the surfaces of any of said cylindric wall sections and of said ribs being perpendicular to any plane disposed radially relative to the elongation of said tube, whereby a radial cross-section of the tube at any point thereof is generally identical with any other point thereof, such that a plurality of identical cores can be produced by radially cutting said tube into a plurality of lengths, each of the cores having an identical cross-section at any point thereof, regardless of the selected length of said cores.
(a) a thin-walled inside cylindric section whose thickness is about 0.3 to about 0.9 mm and whose outer surface is coincident with inside root sections of a plurality of generally radially outwardly protruding, thin-walled ribs, the ribs being each of a thickness generally corresponding to the said thickness of the inside cylindric section;
(b) the radially outside root sections of the respective thin-walled ribs being coincident with radially inside surface of a thin-walled outside cylindric section;
(c) said inside tubular section and said outside tubular section being solid and concentric with each other and having a generally identical axial length;
(d) each of said thin-walled ribs being a solid, generally rectangular and planar rib extending the entire axial length of the tube;
(e) the surfaces of any of said cylindric wall sections and of said ribs being perpendicular to any plane disposed radially relative to the elongation of said tube, whereby a radial cross-section of the tube at any point thereof is generally identical with any other point thereof, such that a plurality of identical cores can be produced by radially cutting said tube into a plurality of lengths, each of the cores having an identical cross-section at any point thereof, regardless of the selected length of said cores.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA264,673A CA1059095A (en) | 1976-11-02 | 1976-11-02 | Plastic core for paper rolls or the like |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA264,673A CA1059095A (en) | 1976-11-02 | 1976-11-02 | Plastic core for paper rolls or the like |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1059095A true CA1059095A (en) | 1979-07-24 |
Family
ID=4107182
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA264,673A Expired CA1059095A (en) | 1976-11-02 | 1976-11-02 | Plastic core for paper rolls or the like |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1059095A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0599789A1 (en) * | 1992-11-24 | 1994-06-01 | SYROM 90 S.p.A. | Roll of self-adhesive tape made from plastic or equivalent film, wound on a tubular core of reduced diameter |
| US5364307A (en) * | 1983-05-23 | 1994-11-15 | Vinylex Corporation | Coaxial drive cable centering apparatus |
| US5669578A (en) * | 1995-09-22 | 1997-09-23 | Ncr Corporation | Crush-proof extrusion core |
| GB2400093A (en) * | 2003-02-14 | 2004-10-06 | Peter George Milton | A core for a roll of printing paper |
| EP2940091A1 (en) * | 2014-05-02 | 2015-11-04 | Magis S.P.A. | Roll of adhesive tape for packaging |
| US9346652B2 (en) | 2011-03-11 | 2016-05-24 | Nitto Denko Corporation | Film winding core, and wound film body using same |
-
1976
- 1976-11-02 CA CA264,673A patent/CA1059095A/en not_active Expired
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5364307A (en) * | 1983-05-23 | 1994-11-15 | Vinylex Corporation | Coaxial drive cable centering apparatus |
| EP0599789A1 (en) * | 1992-11-24 | 1994-06-01 | SYROM 90 S.p.A. | Roll of self-adhesive tape made from plastic or equivalent film, wound on a tubular core of reduced diameter |
| US5669578A (en) * | 1995-09-22 | 1997-09-23 | Ncr Corporation | Crush-proof extrusion core |
| GB2400093A (en) * | 2003-02-14 | 2004-10-06 | Peter George Milton | A core for a roll of printing paper |
| GB2400093B (en) * | 2003-02-14 | 2005-10-26 | Peter George Milton | A core for a roll of printing paper |
| US9346652B2 (en) | 2011-03-11 | 2016-05-24 | Nitto Denko Corporation | Film winding core, and wound film body using same |
| EP2940091A1 (en) * | 2014-05-02 | 2015-11-04 | Magis S.P.A. | Roll of adhesive tape for packaging |
| EP3098278A1 (en) * | 2014-05-02 | 2016-11-30 | Magis S.P.A. | Roll of adhesive tape for packaging |
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