CA2289289A1 - Molded plastic binder - Google Patents

Abstract

An improved binder formed of two cover portions made of rigid material joined together with a living hinge is disclosed. A closure flap with a second living hinge joins the free ends of the cover opposite the binder spine. An improved method of attaching a pocket to the binder is also disclosed. The use of such a technique on rigid polypropylene material allows roll feeding of materials, eliminates the need for a chipboard, allows existing printing and sealing machinery to be employed in the manufacture of the binder, and provides improved durability and aesthetics at a low cost. The cover portions may be provided with a number of design features to properly align one cover portion relative to the other cover portion. A pocket formal of rigid material may also be coupled to one of the cover portions.

Description

MOLDED PLASTIC BINDER
BACKGROUND OF THE INVENTION
1. FSeld of Invention The present invention relates generally to mufti-ring binders for the educational market.

2. Description of Related Art Three-ring binders made of a flexible outer jacket having a spine with a metal three ring clip are known in the art. The edges of such mufti-ring binders are sometimes held together with Velcro or other such hook-and-loop fasteners Many schools have banned such hook-and-loop fastener binders because school children make excessive noise opening and closing these binders.
In addition, when mass-producing binders unit costs must be kept as low as possible, while maintaining a high quality look and feel to the binder. One area of cost involves the need to cut and size plastic stock used to make binders on conventional RF
welding binder machinery.
Further, it has been found that users prefer the texture, thermal conductivity, resiliency and look and feel of certain materials. Consumers are willing to pay a premium for products that are aesthetically pleasing to the touch. Further, consumers are also willing to pay a premium for products that are more durable, and have a sleek look to them, such as for products made from injection molded polypropylene.
At the same time, consumers want binders that are easy to use and durable.
That is, the injection molded binder should open and close easily and be well constructed to withstand the stress of repeated use by a user. In particular, some injoction molded binders have a pocket made of extruded filin designed to hold sheets of paper.
However, after some use, the pocket made of extrudod film is too weak to hold sheets of paper. In other words, the extruded film pocket is not rigid enough to hold sheets of paper.
Furthermore, after some use, the extruded film pocket tends to rip..
Thus, there still is a need for a binder made of injection molded plastic that is easy to use, reliable, and which has a pocket capable of holding sheets of paper for an extended period of time.
SUMMARY OF THE INVENT ION
Accordingly, the object of the present invention is to provide an improved three-ring binder that solves the above mentioned problems using both improved materials and improved mechanical design.
The present invention discloses a plastic binder that is made from plastic material, preferably injection molded polypropylene, in a novel configuration, that is both easier to manufacture in a single pass operation using existing machinery, which holds down unit costs, as well as being aesthetically pleasing.
The present design of an embodiment of the present invention, involving a pocket and living hinge latch and fastener, has numerous features and advantages, including but not limited to:
-- a non-Velcro type fastener, which makes less noise when opening;
- a living hinge fastener or binder closure that is manufactured on the first pass of a production process;
-- the incorporation of a pocket manufactured on a roll process, rather than cut from one or more sheets, to incorporate the pocket into the binder on the first pass of a production process;
-- the use of a perforated mechanism for attachment of a pocket allows a press operator to easily attach the pocket by snapping it to the binder cover during the press operator's down time, avoiding the need for an additional assembly line process; .

- a contemporary, aesthetically pleasing design is made without excessive weld lines, bumps or creases;
- the use of a strong, rigid material, such as injection molded polypropylene, combines an impression of durability and aesthetics;
' - the use of a rigid polypropylene shell as one of the binder covers in a unitary, one-piece manner eliminates the need for an underlying inner chipboard for strength;
--the' use of dual soft and hard textures on the cover, which aid to aesthetics and have utilitarian functions;
--cover portions may be provided with a number of design features to properly align one cover portion to the other cover portion;
~a pocket formed of injection molded plastic may be ultrasonically welded to one of the covers.
The sum total of all of the above .advantageous, as well as the numerous other advantages disclosed and inherent from the invention described herein increases consumer satisfaction and helps expand the market for binders throughout, especially from the kindergarten to high school level.
The above described and many other features and attendant advantages of the present invention will become apparent from a consideration of the following detailed ' description when considered in conjunction with the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
Detailed description of preferred embodiments of the invention will be made with reference to the accompanying drawings.
FIG. 1 is a perspective plan view of the, present invention, a binder.
FIG. 2 is top view of the binder shown in FIG. 1;
FIG. 3 is a bottom view of the binder shown in FIG. 1;
FIG. 4 is a right side view of the binder shown in FIG. 1;
FIG. 5 is a left side view of the binder shown in FIG. 1;
FIG. 6 is a top erid view of the binder shown in FIG. 1;
FIG. 7 is a bottom end view of the binder shown in FIG. 1;

FIG. 8 is a front view of the binder of FIG. 1 opened;
FIG. 9 is a view along the section lines 9-9 in FIG. 8;
FIG. 10 is a broken view of a pocket inlay for the binder, FIG. 11 is a cross sectional view along the binder closure mechanism;
FIG. 12 is an another embodiment of a binder in an open position;
FIG. 13 is a cross sectional view along the section line 13-13 of the binder in FIG.
12;
FIG. 14 is an enlarged perspective view of the bottom end of the binder in FIG. 12;
FIG. 15 is an enlarged perspective view of the right side of the binder in FIG. 12;
FIG. 16 is a right side view of the binder in FIG. 11 in a slightly open position; and FIG. 17 is a cross sectional view along the section line 17-17 of the binder in FIG.
16.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
Disclosed herein is a detailed description of the best presently known mode of carrying out the invention. This description is not to be taken in a limiting sense, but is made merely for the purpose of illustrating the general principles of the invention. The section titles and overall organization of the present detailed description are for the purpose of convenience only and are not intended to limit the present invention.
FIGS. 1-11 disclose the binder of the present invention. The binder 10 has a cover 12, with front or top portion 14, which has an outside side (as shown in FIG.
1 ) and an inside side (as shown in FIG. 8), and a similar back or bottom portion 16, with similar outside and inside sides. The cover has a spine 18 in between the two covers, and free open end edges 20, 22, which may be curved into mating end portions 21, 23. A three-ring metal latch or clip 24, for holding paper, is attached to the back cover 16 to allow the rings to face upwards, as shown, ~or, alternatively, to the spine. One such metal latch is described in US
Pat. No. 5,354,142, incorporated herein. Other designs, such as a clasp or clamp, can be used to hold paper.
Crease lines 28, 29.form'a living hinge between the front and back covers and the spine of the binder. The living hinge lines 28, 29 may be formed of the same material as the cover, e.g., in a preferred embodiment injection molded polypmpylea~e material, or; may be formed of a different material fastened to the material forming the cover, such as plastic At the shaded portions shown in FIG. 1, such as shown by dotted shading 25, a soft, 5 thin layer of vinyl, rubber or thermoplastic material (such as TPR) may be adhesively secured to the underlying polypropylene, to provide ~a non-skid surface and for aesthetic reasons. Similarly, for aesthetic reasons and to convey information the polypr~opyltne may be imprinted with printed matter or colors. When employing polypropylene as a material, the inks used may be of the same kind used by machinery for imprinting vinyl.
The binder has open edges 20, 22 held closed by a closure fastener flap mechanism 31. The open ends 20, 22 have flap portions 21, 23, which may be rigid extensions of the covers 14, 16 respectively (i.e., the flaps may be the covers 14, 16 curved at the open ends to meet together) engaged by the closure flap mechanism 32 to better seal the contends of the binder and prevent documents from falling out.
Regarding the closure fastener or binder closure, a lower clasp or semicircular lower flap 32, which may be formed of the same material as the cover, has a single latch protrusion 36 which extends from the lower flap 32 at right angles. The flap 32 is attached to the lower cover 16 through a living hinge. The living hinge may be formed from the same material constituting the lower cover 16 and lower flap 32, or, may be formed of a different, more flexible material to join together the more rigid lower cover and flap materials, which in a prefen~ed embodiment are made of injection molded polypropylene material.
Protrusion 36 is received by a latch aperture or depression 42 found in the mating semicircular recessed depression 40. The depression 40 contains a thumb well 30 for allowing a user to engage.the tip of one's finger in the thumb well 30 and disengage the binder closure lower flap 32. The semicircular recessed depression 40 is molded into the upper portion of the binder closure, forming the mating upper fastener portion 38, and receives the lower latch 32. Upper fastener 38 is part of the upper cover portion 14 in the upper flap 21. When protrusion 36 is received within aperture 42, the binder is snapped shut along the open edges 20, 22. The closure flap 32 foams an aesthetic oval shape when viewed from the top and end, as shown in FIGS. 2 and 4. A thumb cocas 30 about the aperture 42 allows easy opening of the flap with one's fingernail. The lower flap 32 allows the open ends of the binder to close and gives an aesthetically pleasing look to the binder, as well as protecting the binder more completely.
Tanning attention to FIG. 11, there is shown the end flaps 21, 23, which meet at a ledge 110, forming a stepped recess. The latch mechanism 31 is shown in the closed position, with lower flap 32 received by the upper fastener portion, and rubber or vinyl surface layer 25 (which has shading as indicated because some of the surface layer 25 is in relief) forming a non-skid and aesthetic surface.
The binder 10 is preferably formed of injection molded polypropylene material, a substantially rigid or semi-rigid material. An optional pocket inlay may be attached to the upper cover through a hook and aperh~re arrangement as described herein, such as shown by section lines 9-9 in FIG. 9. Pocket 44 has raised finger hold 46 and a pen hold recess 48 molded in it.
In FIGS. 9-10 show how the binder pocket 44 is attached to the upper half portion 14 of the cover 10 during manufacture, by a tooth and aperture arrangement 50, to help form a mechanical interlock. Both pocket 44 and the cover 10 are made of substantially hard material, injection molded polypropylene, which also forms the bottom cover 16. A
plurality of hooks or teeth 52 in the cover 14 mate with apertures or recesses 54 in the pocket 44. The hooks are formed with outward hook portions 56 that have a flat surface engaging the flat portion 58 of the pocket 44.
Tanning attention now to FIG. 9, there is shown a cmss-section 9-9 ~ of a portion of the upper cover 14 of binder 10, which incorporates the hook and aperh>re seam 50 for holding the pocket 44 to the upper cover 14. The pocket may be on either the outside of the upper cover (not shown) or, as illustrated, on the inside of the upper cover.
The inside pocket 4<! is generally formed of the same material as the cover, preferably injection molded polypropylene, but optionally may be made of a different material.
Furthermore, the pocket 44 may, be attached to the binder cover by a press operator during the press operator's down time, in an easy snap fit manner, by taking advantage of the mechanical interlock between the pocket inlay and the cover.

Other pocket designs are contemplated by the present invention, such as, in lieu, of a pocket inlay sheet 44 that mechanically interlocks with the cover portion, having a pocket flap that is formed from the same stock roll forming the cover, and attached at the bottom side of the cover (e.g., where section line 9-9 is shown in FIG. 8) by a living hinge, so that the pocket folds about this living hinge attached at the bottom side of the cover. The pocket flap would be prevented from flapping about by being attached at the top of the pocket to the cover (e.g., at the top where finger hold 46 is) by mating studs and holes. This design eliminates the requirement of a separate pocket inlay, at the ,~.ost of having to provide a wider stock of material for the cover during assembly (as the pocket inlay would be.
attached, at its living hinge portion, to the bottom side of the cover at section line 9-9).
The stock forming the binder 10 itself can be cut to size during manufacture using the RF sealing die. The binder, L'lce the pocket, can also be cut to size and shape by the RF
sealing die, as both materials are roll fed together in contiguous layers, avoiding the prior techniques of heat sealing of sheets that are fed together by sheet feeding.
Thus, the method of manufacture for the two material binders of the present invention comprises feeding into an RF sealing die a first continuous stock or roll of PVC
material, such as injection molded polypropylene. The injection molded polypropylene may come in injection molded form. The injection molded polypropylene forms the cover 10 comprising two cover portions of the binder, covers 14, 16, and spine 18.
Suitable living hinges, such as at fold lines 28, 29, connect the covers and spine. The living hinge may simply comprise crease or score lines 28, 29 of the same material as the covers 14, 16 and spine (which may be formed of a continuous sheet of material), or, the living hinge may be made of a separate, more flexible material, such as a polypropylene living hinge, which tapes together the three portions of cover 14, cover 16 and spine 10. A second roll of injection molded polypropylene is then used to form the pocket, such as pocket 44 in FIG.

8. As described above, the edges where the two materials forming the cover 14 and pocket 44 meet are joined with mating structures, such as teeth 52 in FIGS. 9-10 mating with apertures 54. The use of such a perforated mechanism for attachment of a pocket allows a press operator to easily attach the pocket by snapping it to the binder cover during the press operator's down time, avoiding the need for an additional assembly line process. The two materials, once aligned so that hook and aperture mate, they can, if desired, be radio frequency (RF) welded, heat sealed, ultrasonically welded, mechanically fastened,' interlocked or otherwise further secured together. The cover can be printed on, and PVC is easily imprinted on with existing vinyl binder industry inks and machinery.
For final assembly, the metal latch is attached to the cover with nuts and bolts or rivets, or other known technologies.
Another embodiment of the present invention is illustrated by way of example in FIGS. 12 thmugh 17. Here, a binder 100 has a number of features designed to make the binder more durable and easier to use. As shown in FIGS. 12 and 14, a pair of guides 102 are coupled to the interior side of the spine 18' (hereinafter primed reference numerals are used to indicate similar elements as described in FIGS. 1 through 11 in the previous embodiment). As best shown in FIG. 14, the pair of guides are positioned to mate with the top and bottom rings of the three ring metal latch mechanism 24' as the top cover 14' is closed relative to the bottom cover 16'. The guides ensure that the top cover is properly aligned with the bottom cover. In other words, the guides prevent the top cover from over-extending relative to the bottom cover because of the proper spacing between the spine and the three ring metal latch. Preferably, the guides have a predetermined length "L" to provide the proper spacing between the spine and the three ring metal latch, as shown in FIG. 14. The length "L" of course may be varied depending on the configuration of the spine and the three ring latch mechanism for a particular binder.
As further shown in FIG. 14, each of the guides preferably has a notch 104 to accommodate its respective metal ring to ensure that the guides will sxurely mate with the metal ring. Incidentally, at rest, that is when the binder is not being handled, the guides may or may not be in direct contact with the respective metal rings. However, when the binder is being carried such that the pressure is being applied to the spine or the covers, the guides will engage with its respective metal rings. Once the notch of the guide engages with the metal ring, the spine is prevented from moving side to side relative to the three ring mechanism. That is, the guides not only align the top cover relative to the bottom cover, but they also prevent side to side movement between the top and bottom covers to minimize the stress applied to the fold lines 28', 29'. This of course prolongs the life of the fold lines 28', 29'.
Although this embodiment discloses two guide members, an embodiment with single or more than two guide members is within the scope of the present invention.
. To further assist in aligning the top cover relative to the bottom cover, FIG. 15 shows a top tooth 108 on the mating end portion 21' of the top cover, and a pair of teeth 106 at the interior side of the bottom cover and near the end of the mating end portion 23'. The tooth 108 is positioned to associate in between the pair of teeth 106. As the top cover closes, the pair of teeth 106 guides the top tooth 108 into proper position so that the mating end portions 21', 23' are properly alignod. Note that the width of the top tooth 108 is substantially similar to the distance between the two teeth 106.
Furthermore, once the top tooth 108 is in position between the pair of teeth 106, the top tooth is prevented from moving side to side. In other words, like the guides 102, the top tooth prevents the top cover from moving side to side relative to the bottom cover. Thus, the combination of tooth and the pair of teeth minimizes the stress that may be applied to the score lines 28', 29' as the binder is applied with external forces from handling. Also, once the top tooth is engaged between the pair of teeth, the pair of teeth prevents the end portion 21' from moving laterally toward the three ring mechanism.
To lock the top and bottom covers together, FIG. 15 shows a pair of latching protrusions 110 positioned to associate with an opening 112 at the mating end portion 21'.
That is, the closure flap mechanism 32' is flipped over to engage the pair of latching protrusions 110 into the opening 112. Having a pair of latching protrusions independent of one another provides a more positive latching mechanism and strength to resist the covers from being pulled off unintentionally. As shown in FIGS. 16 and 17, all the features discussed above in this embodiment ensures that the front cover self adjusts relative to the back cover for proper alignment. That is, as shown in FIG. 16, as the front cover is closed relative to the back cover, the guides 102 ensure that the front cover does not over-extend beyond the back cover. ~ Furthermore, the guides also allow the spine to rest against the three ring metal latch to provide additional support for the front cover when the binder is compressed, handled or carried. As the front cover moves closer to the back cover, the pair of teeth 106 in conjunction with the upper tooth 108 help to further assist in aligning the front cover to the back cover, to tasure that there is no lateral misalignment between the two covers. Once the front and the back covers are in the closod position, the closer flap 5 mechanism 32 is flipped over to lock the front and back covers together via the pair of latching protrusions 110 engaging with the opening 112 as shown in FIG. 17.
Thus, the guides, the upper tooth, the pair of teeth, all work together to properly align the front and back covers together.
As shown in FIG. 14, the spine 18' is curved like the upper left quadrant of a quarter 10 circle. As such, the transition between the spine and the top cover is much smoother than the transition between the bottom cover and the spine. Accordingly, as the top cover is opened and closed relative to the bottom cover, the hinged line 29' has a greater play than the hinged line 28'. In other words, the binder 100 with the curved spine 18' pivots mostly along hinged line 29'. One of the advantages of having a top cover that pivots substantially about the hinged line 29', rather than both hinged lines 28', 29', is that the top cover is more surely constrained to align with the bottom cover as they are closed. For example, a box with a single hinged top will always close in the same position; but if there were two equally active hinged lines, there is greater chance of misalignment. Thus, where there is a single hinge where most of the pivoting occurs, there is more accuracy in aligning the top cover relative to the bottom cover.
Of course, a spine with a plainer surface is within the scope of this invention.
Preferably, in this instance, one hinge has greater play over the other hinge line, so that the two covers will align more accurately.
With regard to the pocket 44', as discussed above, the pocket 44' is preferably ultrasonically welded to the front cover 14, along the contact areas 114 as shown in FIG. 13.
That is, the pocket 44' is ultrasonically welded to the cover 14 along the contact areas rather than being snapped on as disclosed in one of the previous embodiments.
Preferably, a continuous ultrasonic weld is used; however, periodic spot welds are within the scope of this invention. One advantage to the ultrasonic weld is that it provides a strong coupling effect between the pocket and the cover. Strong coupling provides rigidity to the pocket itself so that it is better able to hold sheets of paper within the pocket, so that even if the binder is held upside down, the paper will not fall out. Preferably, outer edges of the pocket 44' is coupled to the cover along the bottom and the left-hand sides 116, 118, respectively, as shown in FIG. 12. This allows a user to easily rosert and remove papers from the pocket, and allows the pocket to expand to hold more papers. Alternatively, a combination of mechanical interlocks, as shown in FIGS. 9-10, and ultrasonic weld may also be used to couple the pocket to the cover.
With regard to the material and welding process, any combination of material and.
the welding process may be used that is known to one of ordinary skill in the art. For example, materials may include (but are aot limited to): rigid or semi-flexible polyvinyl chloride (PVC), ethylene vinyl acetate (EVA), polyurethane and nylon. With regard to the welding process, the pocket may be welded to the binder via a radio frequency welding or ultrasonic welding, for example. Additional coupling means such as heat sealing and adhesive may also be used. Also, the pocket need not be made of the same material as the binder.
Although the present invention has been described in terms of the preferred embodiments above, numerous modifications and/or additions to the above-described preferred embodiments would be readily apparent to one skilled in the art.
Thus, by way of example but not of limitation, the mechanical interlock for holding the pocket in place could be an enlarged stud or mushroom shaped stem mating with a slightly smaller opening in the pocket. Also, a binder without the latching mechanism is within the scope of the present invention. Furthermore, where the three ring latching mechanism is coupled to the spine, the guides may protrude from one of the top or bottom covers to associate with the ring mechanism., With respect to.the claims, it is applicant's intention that the claims not be interpreted in accordance with the sixth paragraph of 35 U.S.C. ~ 112 unless the term "means" is used followed by a functional statement.

Claims (29)

1. A binder comprising a cover comprised of two portions, a top cover portion and a bottom cover portion;
a spine therebetween said top and bottom cover portions and pivotally coupled to said respective cover portions;
said top and bottom cover portions having outwardly extending integral free edges; and said integral free edges being directly overlapping and directly mating with one another preventing relative movement of each of the edges toward or away from said spine of the binder;
a pivoting closure fastener attached to one of said two edges and pivoting to interlock with said other edge.

2. A binder as defined in Claim 1 comprising:
a first living hinge coupling said spine to said top cover portions; and a second living hinge coupling said spine to said bottom cover portions.

3. A binder as defined in Claim 1 wherein:
said closure fastener is comprised of a third living hinge attached to said cover and formed of the same material forming said cover portion.

4. A binder as defined in Claim 2 wherein:
one of said living hinges has greater play than the other living hinge.

5. A binder as defined in Claim 1 further comprising:
a closure fastener for said cover, said closure fastener having a latch portion formed from the same material as one of said first and second cover portions;
and said closure fastener portion forming a living hinge.

6. A binder as defined in Claim 5, wherein:
said closure fastener forming a recessed depression as the other of said first and second cover portions receiving said latch portion from said closure fastener.

7. A binder as defined in Claim 1, further comprising:
a pocket formed on one of said first and second cover portions, said pocket having along its edge a mechanical interlock.

8. A binder as defined in Claim 7, wherein:
said mechanical interlock comprises a plurality of teeth in one of said first and second cover portions engaging a corresponding plurality of recesses in said pocket.

9. A binder according to Claim 7, wherein:
said cover is made of rigid material comprising injection molded polypropylene.

10. A method of manufacturing a binder comprising the steps of:
feeding a first material from a continuous stock of said first material to form a binder;
forming a first cover portion and a second cover portion with curved edges of said binder from said first material;
cutting said first material from said continuous stock; and forming a living hinge between said first and second cover portions of said binder.

11. A method of manufacture according to Claim 10, further comprising the steps of:
forming a sheet, of the same material as the first material, into a pocket inlay to form a pocket in one of said cover of the binder;

affixing said pocket inlay to one of said first and second cover portions, on the inside side of said cover portions, to form a pocket, said step of affixing said pocket inlay to said cover portions is through a mechanical interlock at the edges of said pocket inlay and cover portions; and attaching a binder clip to said binder.

12. The method of Claim 11 further comprising the steps of:
forming said continuous stock of said first material from a roll of rigid material; and forming said mechanical interlock by a mating tooth and aperture arrangement.

13. A binder comprising:
a cover formed of two portions, a first portion, and a second portion;
a hinge in between said first and second portions of said cover;
a pocket coupled to one of said first and second cover portions of said cover;
said hinge being a living hinge; and said first and second portions forming said cover and said pocket are formed of molded plastic.

14. A binder as defined in Claim 13 further comprising:
a spine in between said first and second portions, said living hinge joining said spine to at least one of said first and second portions.

15. A binder as defined in Claim 14 further comprising:
a latch having a plurality of rings coupled to the second cover portion of said cover.

16. A binder as defined in Claim 15 further comprising:

a guide protruding from said spine, wherein said guide is positioned to associate with one of the plurality of rings of said latch, wherein the guide positions the spine in a predetermined position to align the first portion relative to the second portion.

17. A binder as defined in Claim 14 further comprising:
said first and second portions having free edges opposite said spine; and a closure fastener coupled to the free edge of said second portion, and said closure fastener adapted to releasably couple to the first portion.

18. A binder as defined in Claim 17 further comprising:
a pair of latching members protruding from said closure fastener; and said first portion having an opening position to receive said pair of latching members protruding from said closure fastener.

19. A binder as defined in Claim 13 wherein:
said first portion has an alignment tooth;
said second portion has a pair of guiding teeth adapted to receive said alignment tooth, whereby the alignment tooth of said first portion and the pair of guiding teeth of said second portion align the first portion relative to the second portion.

20. A binder as defined in Claim 13 wherein:
said pocket is defined by at least three outer edges, wherein at least one of said outer edges of said pocket is welded to one of said first and second portions of said cover.

21. A binder as defined in Claim 20 wherein:
at least one of the outer edges of said pocket is continuously welded to one of said first and second portions of said cover.

22. A binder as defined in Claim 20 wherein:

at least one of the outer edges of said pocket us ultrasonically welded to one of said first and second portions of said cover.

23. A binder as defined in Claim 20 wherein:
two adjacent outer edges of said pocket is welded to one of said first and second portions of said cover.

24. A binder as defined in Claim 13 wherein:
said first and second portions forming said cover and said pocket are formed of polypropylene plastic.

25. A binder as defined in Claim 13 wherein:
said first and second portions forming said cover and said pocket are formed of injection molded plastic.

26. A binder as defined in Claim 13 wherein:
said second portion is a bottom cover of said binder.

27. A binder as defined in Claim 14 further comprising:
a latch having a plurality of rings coupled to the spine.

28. A binder as defined in Claim 27 further comprising:
a guide protruding from one of said first and second cover portions, wherein said guide is positioned to associate with one of the plurality of rings of said latch, wherein the guide positions the spine in a predetermined position to align the first portion relative to the second portion.

29. A binder as defined in Claim 14 wherein the spine is substantially curved.