JP4498689B2 - Apparatus for carrying out the method of coating the cutting edge of a strip carton - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention covers a cutting edge of a strip carton having a sealable protective layer on both surfaces with a covering strip that can be folded around the cutting edge and bonded to the surface of the strip carton by heating and pressing. As regards the method, the method is such that the coated strip is guided as a sealable strip at the coalesced location, with its flat surface being brought into contact with the cutting edge of the continuously fed strip carton, and then It is guided parallel to the cutting edge to be protected, in which case it is folded and then pressed.
[0002]
The invention further relates to an apparatus for carrying out the method.
[0003]
[Prior art]
In a prefabricated cardboard box or box-like container, which is preferably filled with a liquid filling material, the problem arises that the surface of the cutting edge, in particular the inner cutting edge, is not protected. The filler material penetrates into the carton through the open cutting edge. For this reason, in the known method and the known device of the kind mentioned at the beginning (German Publication 2102001), an edge protection is attached at least for the cutting edge which becomes the inside later. In that case, strips made of a non-transparent, opaque material are used as edge protection, and the strips are folded around the cut edge to be protected, so that both strips of the strip carton with the cut edge are protected. Closely coupled with the surface. In this known method, strips are pulled out of the stock roller and guided parallel to the cutting edge to be protected of the strip carton, where they are folded. In that case, the strip carton and strip are heated together after being folded and then pressed together. A disadvantage of this known method and known device is that the strip is folded loosely to some extent around the open cutting edge before it is heated and pressed.
[0004]
[Problems to be solved by the invention]
The object of the present invention is to make the coated strip firmly abut to the cutting edge to be protected so that it no longer shifts.
[0005]
[Means for Solving the Problems]
The problem is that both surfaces of the strip carton in the region of the cutting edge to be coated are heated to the sealing temperature before reaching the coalescing point, and when the strips reach the coalescing point, before they are still folded, It is solved by sticking to the cutting edge.
[0006]
The sequence according to the invention of the processing steps ensures that the strip is already secured to the cut edge to be protected before folding. The strip is therefore reliably attached to the cutting edge already before folding and always thereafter.
[0007]
It is effective if the strip is pressed against the cutting edge at the coalescing location in the processing step described above. This can be done, for example, by a ring groove of a direction changing roller that changes the direction of the strip at the merged location, and the cutting edge “enters” into the ring groove with a predetermined pressure. At the same time, it is possible to direct the strips to the cutting edge at the combined location. Thereby, the coated strip is always guided against the cutting edge in the desired manner, for example in the middle.
[0008]
In the embodiment of the present invention, after the strip is pasted, it is first folded into a V-shape and then into a U-shape, and then pressed against the surface of the strip-like carton. This type of multi-stage folding makes the process uniform.
[0009]
Other advantages and features of the invention emerge from the dependent claims, in particular from the device claims and from the following description of the embodiments shown schematically.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a top view of an apparatus according to the present invention for performing a method according to the present invention, and FIG. 1A is enlarged along section IA-IA of FIG. It is a fragmentary sectional view shown.
FIG. 2 shows a device according to the invention in the direction of arrow II in FIG.
FIG. 3 is a partial cross-sectional view that is significantly enlarged along the cut surface III-III in FIG. 2.
FIG. 4 is a partial cross-sectional view that is also significantly enlarged along the cutting plane IV-IV in FIG.
FIG. 5 is a partial cross-sectional view showing the enlarged portion along the cutting plane V-V in FIG.
FIG. 6 is a partial cross-sectional view showing a protected belt-like carton along the cutting plane VI-VI in FIG.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
1 and 2, the continuously supplied strip carton 1 is transferred in the transfer direction A by the feed roller pair 2.
[0011]
As is clear from the enlarged cross-sectional view shown in FIG. 1A, the cut strip carton 1 is provided with two surfaces 3 and 4 extending parallel to each other, each of which is a sealable protection. It has layers 5-6. These protective layers 5 and 6 can be layers made of polyester. However, since the side cut edge 7 is not provided with the protective layers 5 and 6 after the strip carton 1 is cut, the cut edge 7 is not protected after forming some type of container. Thus, in some cases, the filling material can penetrate into the container material through this cutting edge 7.
[0012]
For this reason, it is common for the unprotected cutting edge 7 to be covered and protected by the covering strip 8—see also FIG. 6 below. This type of coated strip 8 is pulled out from the stock roller 10 in the pulling direction B as a strip 9 as shown in FIGS. 1 and 2 and as is known from the prior art already described at the beginning. Then, the sheet is folded by a method described later around the cut edge 7 to be protected. The strip 9 is a very flexible and extremely thin material that does not allow liquid to pass through, and the material does not significantly change the thickness of the strip carton 1 after the cutting edge 7 is protected. Despite being thin, the covering strip 8 can consist of a number of material layers, for example two polyester layers, between which a polyester insert is provided for handling the strip 9. Used. Of course, however, a strip 9 made of one material is also possible.
[0013]
The strip 9 is guided so that the flat surface 12 is in contact with the cut edge 7 of the strip carton 1 at the united portion 11. This is performed by a guide roller 13 that rotates in the driving direction C, which will be described in detail later. The strip 9 that is guided in parallel with the cutting edge 7 from the combined portion 11 is then folded around the cutting edge 7 by the folding device 14. In order to be able to firmly bond the covering strip 8 with the protective layers 5 and 6 of the strip carton 1, a heating device 15 is further provided in front of the coalescing point 11, in which case a hot air nozzle 16 is provided. Are directed to both surfaces 3 and 4 of the strip carton 1 in the region of the cutting edge 7. Thereby, the sealable protective layers 5 and 6 of the strip carton 1 are already brought to the sealing temperature in front of the coalescing point 11. The strips 9 are already folded at the coalescing point 11 on the basis of the selected order of the functional members 11 by means of a pressing device 17 which is folded by a folding device 14 and thereafter has two pressure rollers 18. The flat surface 12 is affixed centrally to the cutting edge 7 before being pressed against. Thereby, the strip 9 is no longer displaced during the folding process, and the covering strip 8 is firmly attached to the cutting edge 7 to be protected.
[0014]
As is apparent from FIG. 1, the guide roller 13 is formed as a direction changing roller for changing the direction of the strip 9. As a result, the strip 9 is brought into contact with the cutting edge 7 and simultaneously directed to the cutting edge 7. For this purpose, the guide roller 13 has ring collars 19 and 20 on the side, and the strip 9 is guided between the ring collars. The cutting edge 7 of the belt-like carton 1 is guided in the circumferential groove 21 of the guide roller 13. Accordingly, the belt-like carton 1 enters the circumferential groove 21 with a predetermined pressure, and in that case, the belt-like strip 9 is fixed to the cutting edge 7.
[0015]
The folding device 14 folds the strip 9 around the cutting edge 7 in two steps, in which case the strip 9 is first formed into a V-shape in a fixedly arranged molded sheet 22 and The sheet is folded in a U shape in a subsequent forming roller 23 that is rotationally driven. This will be described in detail later with reference to FIGS.
[0016]
Next, the individual functional members will be described in detail with reference to FIGS.
[0017]
As shown in FIG. 3, the strip 9 provided for the covering strip 8 is pressed against the cutting edge 7 of the strip carton 1 by the guide roller 13 and pasted. This is because the protective layers 5 and 6 of the surfaces 3 and 4 of the belt-like carton 1 are set to the sealing temperature in the heating device 15 in advance. FIG. 3 shows the ring collars 19 and 20 on the side of the guide roller 13, whereby the strip 9 is guided sideways and is thus directed towards the cutting edge 7. Furthermore, it is shown how the cutting edge 7 of the strip carton 1 enters the circumferential groove 21 of the guide roller 13 and thereby presses the strip 9 against the cutting edge 7.
[0018]
FIG. 4 shows the substantially V-shaped folding surfaces 24 and 25 of the fixed shaped sheet 22, in which case only the bottom of the slit is adapted to an ideal V-shape in order to fit the cutting edge 7. It is off. The covering strip 8 is therefore pre-folded in a V shape and thereby close to the surfaces 3 and 4.
[0019]
Small tongues 26 and 27 are provided in front of the folding surfaces 24 and 25, and these tongues are used to form isosceles.
[0020]
The rotating forming roller 23 shown in FIG. 5 has walls 28 and 29 that start on suitable entry ramps and then extend parallel to each other in a narrow folding slit 30. . As a result, the covering strip 8 or the strip-shaped strip 9 is folded in a U shape around the cut edge 7 to be protected. The result is shown in FIG. The heating of the protective layers 5 and 6 of the strip carton 1 affects the pressing roller 18, so that the free sides of the covering strip 8 can be firmly pressed against the surfaces 3 and 4 of the strip carton 1.
[Brief description of the drawings]
FIG. 1 is a top view of an apparatus according to the present invention for performing a method according to the present invention, and FIG. 1A is shown enlarged along section IA-IA in FIG. It is a fragmentary sectional view.
2 shows a device according to the invention in the direction of arrow II in FIG.
FIG. 3 is a partial cross-sectional view showing a significantly enlarged view along the cutting plane III-III in FIG. 2;
FIG. 4 is a partial cross-sectional view that is also significantly enlarged along the cutting plane IV-IV in FIG. 2;
FIG. 5 is a partial cross-sectional view that is similarly significantly enlarged along the cut surface VV of FIG. 2;
6 is a partial cross-sectional view showing a protected strip carton along the cutting plane VI-VI in FIG. 2; FIG.
[Explanation of symbols]
1. Strip carton3. Both surfaces4. Both surfaces7. Cutting edge 11. Combined location 13. Guide roller 14. Folding device 15. Heating device 16. Hot air nozzle 19. Ring collar 20. Ring collar 21. Circumferential groove 22. Molded thin plate 23. Forming roller 24. Folding surface 25. Folding surface 28. Parallel walls 29. Parallel walls 30. Folding slit

Claims (5)

A method of coating a cut edge of a strip carton having a sealable protective layer on both surfaces with a covering strip that can be folded around the cut edge and bonded to the surface of the strip carton by heating and pressing. The strip is guided as a sealable strip in a manner that its flat surface is in contact with the cutting edge of the strip carton that is continuously supplied at the joining point, and then the cutting strip to be protected. Guided parallel to each other, in which case it is folded and then pressed together, and the strip carton is heated to the sealing temperature before reaching the coalescing point in the region of the cutting edge to be coated, In the apparatus for carrying out the method of covering the cut edge, the strip is affixed to the cut edge before being folded when the union is reached.
A pair of feed rollers for continuously transporting the strip carton;
Stock rollers for coated strips to be supplied as sealable strips;
A guide roller for guiding the flat surface of the strip in contact with the cutting edge at the union place;
A heating device for heating the strip carton to the sealing temperature;
A folding device for folding the strips around the cutting edge;
A pressing device for press-contacting the folded strips to the surface of the strip carton;
I have a,
The heating device (15) is provided in front of the coalescence location (11) in the transfer direction (A) of the strip carton (1) , and the guide roller (13) is provided at the coalescence location (11). , Being formed as a direction changing roller for changing the direction of the strips (9), and the guide roller (13) on the side ring collars (19, 20) for the strips (9), equipment characterized in that the circumferential groove (21) is provided for the cutting edge of the strip carton (1) (7). Strip carton (1), for both the surface area of the cutting edge (7) (3,4) Apparatus according to claim 1, characterized in that the hot air nozzle (16) is provided. 3. A device according to claim 1, wherein the folding device (14) comprises a fixedly arranged forming sheet (22) and a rotatable forming roller (23). 4. Device according to claim 3 , characterized in that the shaped thin plate (22) is provided with a substantially V-shaped folding surface (24, 25). 5. A device according to claim 3 or 4 , characterized in that the forming roller (23) is provided with a narrow folding slit (30) having parallel walls (28, 29).

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