EP3507067A1

EP3507067A1 - Cardboard-cutting tool equipped with a compressible ejection element, and cutting machine equipped with such a tool

Info

Publication number: EP3507067A1
Application number: EP17768839.7A
Authority: EP
Inventors: Antoine BELNOU
Original assignee: Fogepack Consommables
Current assignee: Fogepack Consommables
Priority date: 2016-09-05
Filing date: 2017-09-01
Publication date: 2019-07-10
Also published as: FR3055567B1; MA46097A; WO2018042134A1; FR3055567A1

Abstract

The invention relates to a compressible ejection element (8) for a cutting tool (1) for a cardboard-cutting machine (3) of the flat or rotary press type. The tool (1) comprises at least one blade (6) and at least one compressible ejection element (8) positioned near the blade and configured to push the cardboard away after it has been cut by the blade. The compressible ejection element (8) comprises a multilayer structure comprising at least one base (12) made of compressible foam and a protective film (13) that comes into contact with the cardboard during the cutting operation. The invention also relates to the machine (3) equipped with such a tool (1).

Description

CARDBOARD CUTTING TOOL EQUIPPED WITH COMPRESSIBLE EJECTION ELEMENT AND CUTTING MACHINE EQUIPPED WITH SUCH A TOOL

TECHNICAL FIELD The present invention relates to the field of flat or rotary press type cardboard cutting machines and more specifically to the field of cardboard cutting tools for such machines, such tools comprising means for ejecting the cardboard. The invention relates particularly to these cardboard ejection means present on the tool. State of the art

Carton cutting tools implemented on carton cutting machines are well known to those skilled in the art.

Traditionally, such a tool comprises at least one blade, also called cutter, which defines a shape corresponding to the shape of the cut to be made on the sheet of cardboard. This at least one blade is mounted on a base, also called a "wood". This base can be flat in the case of a flat press, or circular in the case of a rotary press.

During the cutting operation by a translational movement or rotation of the cutting tool, the blade enters the cardboard sheet and then leaves the latter, showing the cut. During the extraction of the cardboard blade, it can hang on the blade.

To overcome this attachment of the cardboard blade during its extraction, it is known to have on the cutting tool a compressible ejection element consisting of a block of foam glued to the base near the blade. During the penetration of the blade in the carton, the foam block is compressed and during the release of the blade, said foam block relaxes and pushes the cardboard to eject the blade.

A disadvantage of such foam blocks is their rapid delamination with use, requiring frequent replacement (about every three months) of the foam blocks on the cutting tools. This delamination can be slowed down by using more efficient foam, "high-end", which however considerably increases the cost of the cutting tool. This delamination of the foam imposes a rigor of control and replacement of foam blocks in certain areas, for example in the food industry, because it is essential to prevent delaminated foam pieces from being found on the chain. of production. The cutting of the cardboard also generates a lot of cardboard dust which penetrates the pores of the foam and the mouths, which greatly reduces the dynamism of the foam blocks, they losing all their effectiveness. This makes it more difficult to clear the board from the blade. In addition, the storage of dust in the pores of the foam requires regular cleaning of the cutting tools by blowing the foam blocks. It is also common to paint machines in light colors to visualize more easily the dust and perform a dedusting of the foam. This accumulation of dust also imposes a rigorous control and cleaning of cutting tools in certain areas, such as the food packaging field where hygiene rules are very stringent, the tools are cleaned very frequently, early , to guarantee the quality of the products.

Summary of the invention

The present invention aims to overcome the aforementioned drawbacks. For this purpose, the invention firstly relates to a compressible element for ejecting a cutting tool for a carton cutting machine of the flat press or rotary press type. The invention also relates to a carton cutting tool equipped with one or such compressible ejection elements, and a cardboard cutting machine equipped with one or such cutting tools.

The tool according to the invention comprises at least one blade, also called cutting net, which defines a shape of the cardboard to be cut. However, it is possible to envisage several blades defining several shapes, or even several blades defining in combination a single shape. In addition, the tool comprises at least one compressible ejection element which is arranged near the blade and configured to push the carton after cutting by the blade.

Remarkably, the compressible ejection element according to the invention comprises a multilayer structure comprising at least one compressible foam base and a protective film coming into contact with the carton during the cutting operation. The foam base provides the compressible ejection element with its dynamism allowing it to properly resume its shape after cessation of compression, that is to say during the clearance of the blade that has just cut the cardboard. The protective film covering the foam base prevents direct contact of this foam base with the cardboard during cutting where said foam base is compressed, which greatly reduces the delamination of the latter. In addition, the protective film prevents the penetration of dust into the compressible foam base, which allows the latter to maintain its initial dynamism for a good ejection of the cardboard during the release of the tool. In addition, the presence of the protective film makes it possible to collect the dust from the cardboard generated during the cutting on its external face, which considerably facilitates the removal of the dust, the outer face of the protective film being easily cleaned by means of a damp cloth. In a preferred embodiment of the compressible ejection element which is the subject of the invention, the foam base is made of an elastomer material of the ethylene-vinyl acetate (EVA), chloroprene (CR), styrene-butadiene (SBR) type. or ethylene-propylene-diene monomer (EPDM). The choice of the foam will depend in particular on the price of the tooling retained, which will have an impact on its performances and its longevity, although it is optimized by the presence of the protective film, an SBR foam being less robust than EPDM foam, itself less robust than an EVA foam. The type of cardboard to be cut may also affect the choice of foam. Of course, one can consider other foams for the realization of the base, without departing from the scope of the invention.

In a preferred embodiment of the compressible ejection element object of the invention, the protective film is made of a polyester material, which ensures a good resistance to contact with the cardboard during cutting, allows to properly retain the dust of cardboard to prevent its infiltration into the pores of the foam base, and allows easy cleaning of its outer face with a damp cloth for the removal of dust, without risk of moisture infiltration into the foam base during cleaning. In addition, the choice of polyester makes it possible to produce a protective film of very small thickness, which makes it possible to work with great precision. This also makes it possible to preserve a substantial foam base thickness without modifying the height of the compressible ejection element, compared to that of the traditional foam blocks, so that said compressible ejection element retains a suitable dynamism and that the dimensions standard cutting tools are preserved. By preserving standard dimensions, it is thus possible to adapt the compressible ejection element according to the invention to the already existing cutting tools, replacing the previous foam blocks during maintenance operations. We could obviously consider other materials offering the same technical effects and advantages as those mentioned above for the implementation of the protective film, without departing from the scope of the invention.

According to the compressible ejection element object of the invention, an adhesive coating is implemented between an inner face of the protective film and an outer face of the foam base, so as to allow the bonding of the protective film with the foam base. Preferably, the coating is deposited on the inner face of the protective film, then the protective film is adhered to the outer face of the foam base during the design of the compressible ejection element.

According to the compressible ejection element object of the invention, an adhesive coating is placed on the foam base for bonding said compressible ejection element on the cutting tool. Preferably, the adhesive coating is deposited on the inner face of the foam base and then provisionally coated with a sheet of paper before bonding the compressible ejection element on the base.

According to the cutting tool object of the invention, it comprises a base also called "a wood". This base is provided with an outer face of which extend the at least one blade and the at least one compressible ejection element. When the cutting tool is implemented on a flat press, the base is flat and the at least one blade and the at least one compressible ejection element extend perpendicularly to said plane. When the cutting tool is implemented on a rotary press, the base is circular and the at least one blade and the at least one compressible ejection element extend radially to said base.

According to the cutting tool that is the subject of the invention, the compressible ejection element is adhered to the external face of the base by means of an adhesive coating, in particular the adhesive coating implemented between the internal face of the base in question. foam, as mentioned above. However, it would be possible to first deposit the adhesive coating on the outer face of the base and then to deposit the compressible ejection element on said adhesive coating for its bonding with the base.

In one embodiment of the cutting tool object of the invention, it comprises at least two compressible ejection elements respectively arranged on each side of the at least one blade. This allows to clear appropriately the cut cardboard shape as the cardboard rebus, obtained after cutting the cardboard sheet by the blade. The expulsion of the board from the blade is done in a balanced manner, which avoids bursting on the edges of the cardboard cut during its expulsion from the blade. According to the compressible ejection element object of the invention, the protective film is implemented in a light color so as to distinguish more easily the presence of dust on this compressible ejection element, which allows to perform frequent visual checks to clean the protective film when necessary. According to the cutting tool object of the invention, it further comprises at least one creasing element that allows for a groove on the carton defining a fold line. In addition, the tool comprises at least one compressible ejection element arranged close to said creasing element, said compressible ejection element comprising the aforementioned characteristics of the invention. Preferably, two compressible ejection elements are arranged respectively on each side of the creasing element, in the vicinity thereof, which allows an expulsion of the cardboard homogeneously.

The characteristics described above may be implemented independently or in combination on the compressible ejection element and on the cutting tool, without excluding the possibility of implementing other variants within the scope of the invention, even additional features.

The invention also relates to a carton cutting machine comprising at least one cutting tool that has at least the aforementioned essential characteristics on the compressible ejection element or elements, implementing the invention.

This cutting machine can be of the flat press type. In this case, the machine comprises a planar matrix on which is arranged the cutting tool which has a base of flat shape.

This cutting machine can instead be of the rotary press type. In this case the die is a roll on which is arranged the cutting tool which has a circular base. Brief description of the figures

The features and advantages of the invention will appear on reading the following description based on figures, among which:

Figure 1 shows schematically in side view a cutting tool implemented on a plane flat press die, showing in particular a blade and a compressible element; FIG. 2 schematizes in side view a cutting tool implemented on a rotating rotary die;

Figure 3 shows schematically in enlarged view a compressible ejection element;

Figure 4 shows schematically in front view a cutting tool, according to an alternative embodiment;

FIG. 5 is a diagrammatic view in side view of a cutting tool implemented on a plane flat press die, showing in particular a creasing element and two compressible ejection elements.

Detailed description The following description uses the same references to define the same characteristics according to the various variants illustrated, unless otherwise indicated in the text.

In the rest of the description, the carton cutting tool is named "the tool" and the carton cutting machine is called "the machine". In Figure 1 is illustrated a tool which is mounted on a flat die 2 arranged on a machine 3 of the flat press type, the tool 1 moving in a translational movement back and forth illustrated by the double-arrow 4. Such a machine 3 is well known to those skilled in the art, so it is not detailed. The tool 1 comprises a base 5 on which is mounted a blade 6 which defines an open or closed shape, according to the cutting of the cardboard to be produced. It is possible to envisage several blades 6 defining in combination a shape or several shapes on the base 5. By way of example, in FIG. 4, the blade 6 defines a shape 7 which is closed on the base 5. The tool 1 comprises also a compressible ejection element 8 of rectangular shape for pushing the cardboard on a side 9 of the blade 6 adjacent to said compressible ejection element 8, so as to prevent the cardboard remains gripping said side 9 during the ascent of the blade 6 from cutting the carton (not shown). The external face 10 of the compressible ejection element 8 extends beyond the end 11 of the blade 6, under normal conditions where said compressible ejection element 8 is not stressed, that is, that is to say outside a cutting phase of the cardboard.

In Figure 2, we find exactly the same characteristics as those mentioned above, with the same references used, the difference being that the machine 3 is of the rotary press type. The matrix 2 consists of a roll (or cylinder), the base 5 is circular and the excremental compressible element 8 preferably has a circular portion shape. As illustrated in FIGS. 1 to 3, the compressible ejection element 8 comprises a foam base 12 and a protective film 13. The foam base 12 is made of a styrene-butadiene elastomer material (SBR ) which will preferably be retained in order to reduce the manufacturing cost of the tool 1. However, it is also possible to envisage an elastomeric material of the chloroprene (CR), ethylene-propylene-diene monomer (EPDM) or ethylene-vinyl acetate (EVA) type. ) or other compressible foam materials with a good dynamism at the foam base 12 to allow it to quickly resume its normal shape after compression. The protective film 13 is preferably made of a white-colored polyester material or any other light color in order to easily display the cardboard dust deposits generated during the cutting of the cardboard. The outer face 14 of the protective film 13 constitutes the outer face 10 of the compressible ejection element 8, coming into contact with the carton during the cutting and ejecting operation. The inner face 15 of the protective film 13 receives an adhesive coating 16 for bonding said film to the outer face 17 of the foam base 12. Similarly, the inner face 18 of the foam base 12 receives an adhesive coating 19 allowing bonding said base to the outer face 20 of the base 5. The adhesive coating 19 will preferably be protected by a strip of paper before bonding the compressible ejection element 8 on the base 5.

FIG. 4 is a schematic representation of a variant of the tool 1 showing in particular the possibility of positioning compressible ejection elements 8, 8 'on each side of the blade 6, for each portion of said blade 6 defining the shape 7. The lengths of the compressible ejection elements 8, 8 'will depend in particular on the lengths of the portions of the blade 6.

FIG. 5 shows a tool 1 corresponding for example to that of FIG. 1, the tool 1 moving in a reciprocating movement illustrated by the double-arrow 4 on the machine 3. Of course, the Tool 1 of Figure 5 will implement the same or similar characteristics to those described above for Figures 1 to 4, according to whether it is a machine 3 type flat press or rotary press. As illustrated in FIG. 5, the tool 1 comprises a creasing element 21 which makes it possible to make a groove in the carton during the actuation of the tool, this groove defining a fold line on the carton instead of a cut as in the case of the blade 6 previously described. This creasing element 21 is mounted on the base 5. One can consider several creasing elements 21 on the base, according to the desired fold lines on the cardboard. The tool 1 also comprises two compressible ejection elements 22, 22 'of rectangular shape for pushing the cardboard on both sides 23, 23' of the blade 6 adjacent to said element compressible ejection 22, 22 ', so as to homogeneously expel the cardboard during the ascent of the creasing element 21. The design of these two compressible ejection elements 22, 22' is identical to that described above for the compressible ejection elements 8, 8 '. Preferably, the end 24 of the creasing element 21 extends slightly beyond the external faces 25, 25 'of the compressible ejection elements 22, 22', as shown in FIG. remains possible, however. One could also consider a single compressible ejection element 24 on one side of the creasing element 21, but this solution will not be preferred for a balancing issue during the expulsion of the carton.

The foregoing detailed description is in no way limiting. On the contrary, it aims to remove any imprecision as to its scope. Thus, many variants may be envisaged within the scope of the invention, in particular as to the number of shapes 7 on the base 5 of the tool, as to the number of blades 6 on the base 5 and as to the number of compressible elements ejection 8, 8 'and their position on the base 5 and vis-à-vis the blade or blades 6. The number of creasing elements 21 and compressible ejection elements 22, 22' will vary also.

It will also be possible to choose other materials than those mentioned in the foregoing description, for the implementation of the foam base 12 and the protective film 13, without departing from the scope of the invention.

Claims

1. compressible ejection element (8, 8 ') of a tool (1) for cutting the cardboard for a machine (3) for cutting the cardboard, characterized in that it comprises a multilayer structure comprising at least one base a compressible foam (12) and a protective film (13) which comes into contact with the carton during the cutting operation.

The compressible ejection element (8, 8 ') according to claim 1, wherein the foam base (12) is made of an ethylene-vinyl acetate (EVA) elastomeric material, chloroprene (CR), styrene -butadiene (SBR) or ethylene-propylene-diene monomer (EPDM).

3. compressible ejection element (8, 8 ') according to one of the preceding claims, wherein the protective film (13) is made of a polyester material.

4. compressible ejection element (8, 8 ') according to one of the preceding claims, wherein an adhesive coating (16) is disposed between the protective film (13) and the foam base (12) for bonding between said elements.

5. compressible ejection element according to one of claims 1 to 4, wherein an adhesive coating (19) is disposed on the foam base (12) for bonding said compressible ejection element on the tool (1). ).

6. compressible ejection element (8, 8 ') according to one of the preceding claims, wherein the protective film (13) is in a light color.

7. Cutting tool (1) comprising at least one blade (6) and at least one compressible ejection element (8, 8 ') arranged near the blade and configured to push the cardboard after its cutting by the blade, said compressible ejection element comprising the features of any one of claims 1 to 6.

8. cutting tool (1) according to claim 7, which comprises a base (5) provided with an outer face (20) of which extend the at least one blade (6) and the at least one element compressible ejection (8).

9. Cutting tool (1) according to claim 8, wherein the compressible ejection element (8, 8 ') is adhered to the external face (20) of the base (5) by means of an adhesive coating ( 19).

10. Cutting tool (1) according to one of claims 7 to 9, which comprises at least two compressible ejection elements (8, 8 ') respectively arranged on each side of the at least one blade (6).

11. Cutting tool (1) according to one of claims 7 to 10, which comprises at least one creasing element and at least one compressible ejection element arranged in the vicinity of said creasing element, said compressible ejection element comprising the features according to any one of claims 1 to 6.

12. Machine (3) for cutting the carton comprising at least one cutting tool (1) according to one of claims 7 to 11.

13. Machine (3) cutting according to claim 12, which is of the type flat press or rotary press.