DE3813102C1 - Document file - Google Patents

Abstract

The document file consists of a bottom cover (7), a spine (8), a front cover (9) which, like the bottom cover, can be pivoted in a hinged manner relative to the spine along a narrow connecting zone (10), and, preferably, a mechanism, secured to the inside of the bottom cover (7) or of the spine (8), for storing perforated papers or the like. In an embodiment which is particulary aesthetically attractive, light and inexpensive to produce, the two covers (7, 9) and the spine (8) are designed as a one-piece unit separated out from a thermoplastic web sheet blank (5), preferably of extruded polypropylene, in the course of a narrow welded connection of the two plates of the web plate, which are connected to each other via webs, and closed along the separation edge by welding, in which the hinge-like connection between the spine (8) and the two covers (7, 9) is formed by mutual welding of the plates of the web plate to each other along the narrow connecting zone (10). <IMAGE>

Description

File folder consisting of a bottom cover, a Back, a front cover, which, like the lower cover, comes in with respect to the back along a narrow connecting zone is pivotable like a hinge, and preferably one on the Inside of the lower lid or the back fixed me Mechanism for storing perforated papers or the like the lid and the back from a multi-wall sheet blank thermoplastic material, preferably made of extruded bottom lypropylene exist.

In conventional folders of the most common type, they are Lid and back formed from a cardboard core, and at least at least in the area of the back is one of the reinforcements on the outside glue-on linen or plastic strips, the front edge strips are folded inwards. The outside of the lid is analogous with a patterned exterior  The paper layer is pasted over, the edges of which are tight and inward are laid. At a certain distance from the lid and The inside of the covers and are running along the back edges the back with another layer of paper stuck on it over the inwardly folded edge zones of the outer lei NEN or plastic strips of the back and the outer Pa stretches and covers them neatly. Such folders are also mei in the areas particularly at risk of impact Mostly with a metallic edge cover.

Because of the great need, such are trained Folder in spite of high manufacturing costs for decades manufactured in large numbers. You have in practice proven wherever it is used in a relatively clean environment Environment takes place. On damp or through Lubricants or the like. Dirty places, such as. B. in La rooms or workshops, however, such folders quickly become un handsome, and there is even a risk that the Linen, plastic or paper glued on the outside peel off layers. Folders for such a harsh environment have therefore been used for years instead of Paper coating with a slightly more complex outer and inner plastic film cover, which is practical is impermeable to moisture and in case of pollution easy cleaning with oil or grease. Since the Plastic cover available in any color stands, these more expensive versions have everywhere enforced where the user primarily relies on the friendlier coloring of such folders is important.

Aside from the high manufacturing cost, too the relatively high weight of such folders as disadvantageous displayed. To lower this, it is already known (DE- GM 86 13 224), one in each of the cardboard folder covers Switch on layer of corrugated cardboard.  

Finally, it was proposed (DE-OS 24 00 617) assume a panel cut that is made of one layer made of foamed polypropylene. Fold lines can be press in here using an embossing tool.

Attempts have also been made to appeal aesthetically de folder by creating the size of a folder back and a front cover or a lower cover agreed colored multi-wall sheet cuts instead of reinforcement Cardboard inserts inserted between transparent foils be welded, the weld seam of the foils being tight except runs half of the multi-wall sheet blanks. Although the edge open Structure of the be between the webs of the multi-wall sheet blanks sensitive chambers can be seen in this way Create folders with a very attractive exterior because the color of the folder by that of the multi-wall sheet blanks is determined. The production of such folders is however only in a large number of production steps and therefore with considerable effort and time possible.

At this point it should be mentioned that it is known Multi-wall sheet panels with cold-stamped folded edges to be verse hen to a relative pivoting of parts of the Zu cuts in relation to each other, for example to form To enable folding boxes or the like. You have on this Way also made primitive folders that like the fragli Chen folding boxes the main disadvantage of the open edge Form the cut so that relatively sharp edges have to be accepted, which would affect the handling term. Dust and dirt can also enter the open chambers penetrate between the webs; such formed fold boxes, folders or the like will therefore become over time unsightly.

The invention has for its object a folder to create the genus mentioned, which despite ge low manufacturing costs with low weight due to high stability  quality and a particularly appealing appearance and against effects from moisture, oil and fat to a large extent insensitive or easy to clean if necessary.

The folder according to the invention, in which this task ge is essentially characterized in that the Lid and back as from the web plate cut in the train a narrow welded joint between the two over webs at the  connected plates of the web plate, along the separating edge, closed by welding dete one-piece unit are formed, in which the hinge-like connection between the back and the two Cover by mutually welding the plates of the web plate formed together along the narrow connecting zone is.

Such a folder is characterized by be ne low production costs, as the starting material serving multi-skin sheets are inexpensive commercially available. Furthermore, the low risk of impairment in rough, namely to emphasize in damp surroundings or in places who easily run the risk of pollution; et Soiling can be done quickly and easily, and mostly without leaving any traces, from the outer surfaces remove the lid or back. Since multi-skin sheets are available in practically all colors Possibility of folders in a corresponding variety of colors ben. It doesn't even need one Laminating with a color of the desired color towards the foil.

As aesthetically pleasing and very appealing moreover for the rigidity of the lid and back unit It turned out to be beneficial if the hinge-like connections between the back and everyone of the two lids and, accordingly, the parallel ones Outer edges of the lower cover and front cover each along the egg a line that is an acute angle with the course the webs of the multi-wall sheet blank includes. At a such course that form the hinge-like connection In the narrow connecting zone, this becomes temporary melted material of the locally deformed webs for Solidification and stiffening of the folder lid or the Folder back used in a very advantageous manner.  

The Erfin in the following description using a illustrated in the drawing embodiment illustrated. It shows

Fig. 1 is a perspective view of a section of a web plate,

Fig. 2 is a plan view of a multi-wall sheet blank and

Fig. 3 is a perspective view of a folder formed from the multi-wall sheet blank, on a larger scale.

As can be seen from Fig. 1, a web plate 1 comprises two spaced and parallel plates 2, 3 , which are connected to each other across them and in turn par allel mutually extending webs 4 and thus a very light, yet particularly rigid Form unit. These multi-wall sheets 1 consist of thermoplastic material; they are formed in particular by extrusion of polypropylene.

Commercially available multi-wall sheets 1 generally have a thickness a) of approx. 3.5 mm, have approx. 26 webs at regular intervals distributed over 10 cm and a web thickness of 0.2-0.3 mm and a slightly larger sheet thickness. Of course, if necessary, to increase the rigidity, multi-wall sheets of this type can also be produced with a larger board or web thickness; it can of course also be expedient, depending on the particular application, to use web plates with a greater or lesser thickness than the thickness a) = 3.5 mm.

Fig. 2 shows a multi-wall sheet blank 5 , the outer dimensions of which exceed those of the folder 6 to be manufactured according to FIG. 3. The latter comprises a lower cover 7 , a back 8 and a front cover 9 which, like the lower cover 7, can be pivoted like a hinge in relation to the back 8 along a narrow connecting zone 10 .

On the inside of the bottom cover is not closer to illustrated but common way, e.g. B. by riveting a mechanism, preferably a lever mechanism for storing the from the folder to be recorded papers, documents or the like sets. For folders of smaller dimensions, e.g. B. in the form of so-called called ring binders can also the mechanics instead of on the lower cover be mounted on the inside of the back.

In order to win the unit from the lower cover 7 , back 8 and front cover 9 from the multi-wall sheet blank 5 , the plates 2 and 3 of the multi-wall sheet 1 are locally heated and pressed together to form a narrow welded joint along the peripheral contours of this unit; the web plate material is brought together at this point and fused together. In the same way, expediently at the same time, the narrow Verbindungszo ne 10 is formed by approaching and welding the plates 2 and 3 . Immediately next to the weld seam along the outer contours of the unit, the plate material is cut through to release the unit from the blank. This leaves only a narrow waste grid 11 , which in practice can be kept comparatively smaller than indicated in FIG. 2.

It has been shown that for the purpose of connecting the two plates 2, 3 of the multi-wall sheet 1 to one another without disturbing interference by the webs 4, welding devices which have been known for a long time can be used, which have hitherto been used for welding thermoplastic films lying directly on top of one another at the welding zone were. The like devices, as described in DE-PS 27 57 628 be, include a welding tool and a counter tool, of which mainly the first of the necessary for softening and melting heat supply to the welding point serves through a thermally conductive conveyor belt, while the counter tool , which has the profiling required for the formation of the weld seam, is kept at a temperature below the welding temperature in order to avoid sticking to the weld metal. In the area of the profiling for forming the weld seam, the counter tool can advantageously be provided with a decor which gives the weld seam area an attractive appearance. This counter tool includes in addition to the area, namely outside the same, which serves to connect the plates 2 and 3 , a cutting edge through which the separating seam can be produced in the cut, along which a welded and shaped embossed web plate cut can be removed from the edge area. Of course, the additional cutting edge is missing in the counter tool for the formation of the hinge-like connecting zone 10 .

In the same way as the cover-back unit is formed from the multi-wall sheet blank 5 with simultaneous formation of an all-round closed edge, can be created in the same operation by creating the narrow welded joint along the circumferential contours of this unit and the narrow connec tion zone 10 , which grips the Folder enabling usual union opening 12 by a combined welding and cutting process.

Of course, can be set on the back 8 of the folder a serving for the formation of a pocket transparent film strip 13 . This is preferably done by welding the strip 13 in its edge region simultaneously with the formation of the all-round closed separating edge of the folder and the hinge-side connection zone 10 .

Of course, additional pockets can also be welded to other areas of the folder, for example on the inside of the front cover 9 and / or lower cover 7 .

While so far in the production of folders from one laminated cardboard cut for reinforcement apart from rounding off the folder edges, results themselves in the manufacture of the multi-wall sheet folder according to the invention the possibility of training only through appropriate training Tools in the area of the free corners of the lid are generous To provide roundings.

Such a rounding 15 is indicated in FIGS . 2 and 3 each because in dashed lines.

Claims (4)

1. file folder consisting of a lower cover ( 7 ), a back ( 8 ), a front cover ( 9 ) which, like the lower cover ( 7 ) with respect to the back ( 8 ), can be pivoted like a hinge along a narrow connecting zone ( 10 ), and preferably one on the inside of the lower cover ( 7 ) or the back ( 8 ) fixed mechanism for storing ge perforated papers or the like., The two covers ( 7, 9 ) and the back ( 8 ) from a multi-wall sheet blank ( 5 ) Thermoplastic material, preferably made of extruded polypropylene, characterized in that the lid ( 7, 9 ) and the back ( 8 ) as from the web plate blank ( 6 ) in the course of a narrow welded connection of the two plates connected to one another via webs ( 4 ) ( 2, 3 ) of the web plate ( 1 ) separated, along the separating edge by welding ge formed integrally formed unit are formed, in which the hinge-like connection between the back ( 8 ) and the two lids ( 7, 9 ) by mutual Ver welding the plates ( 2, 3 ) of the multi-wall sheet together with one another along the narrow connecting zone ( 10 ) is formed. 2. File folder according to claim 1, characterized in that the hinge-like connections between the back ( 8 ) and each of the two lids ( 7, 9 ) and accordingly the parallel outer edges of the lower lid ( 7 ) and front lid ( 9 ) each lengthways run a line that includes an acute angle with the course of the webs ( 4 ) of the web plate blank ( 5 ). 3. File folder according to claim 1 or 2, characterized ge indicates that the free folder edges became known per se ter way are provided with a rounding. 4. File folder according to one of claims 1 to 3, there characterized in that a along the folder edges Weld seam with a decorative profile is provided.