FR3055567A1 - CARDBOARD CUTTING TOOL EQUIPPED WITH COMPRESSIBLE EJECTION ELEMENT AND CUTTING MACHINE EQUIPPED WITH SUCH A TOOL - Google Patents

Abstract

The invention relates to a compressible ejection element (8) for a cutting tool (1) for a machine (3) for cutting flat or rotary presses. The tool (1) comprising at least one blade (6) and at least one compressible ejection element (8) arranged near the blade and configured to repel the carton after cutting by the blade. The compressible ejection element (8) comprises a multilayer structure comprising at least one compressible foam base (12) and a protective film (13) coming into contact with the carton during the cutting operation. The invention also relates to the machine (3) equipped with such a tool (1).

Description

Holder (s): FOGEPACK CONSUMABLES.

Extension request (s)

Agent (s): CABINET RIFFLART VANDENBOSSCHE.

FR 3 055 567 - A1 (64) CARTON CUTTING TOOL EQUIPPED WITH A COMPRESSIBLE EJECTION ELEMENT AND CUTTING MACHINE EQUIPPED WITH SUCH A TOOL

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

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

Technical area

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

State of the art

Cardboard cutting tools used on cardboard cutting machines are well known to those skilled in the art.

Traditionally, such a tool comprises at least one blade, also called a cutting net, which defines a shape corresponding to the shape of the cut to be made on the cardboard sheet. 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 even circular in the case of a rotary press.

During the cutting operation by a translational or rotational movement of the cutting tool, the blade enters the cardboard sheet and then comes out of it, revealing the cut. During the extraction of the cardboard blade, the cardboard can hang on the blade.

To overcome this attachment of the cardboard to the 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 into the cardboard, the foam block compresses then, during the release of the blade, said foam block relaxes and pushes the cardboard back to eject it from the blade.

One drawback of such foam blocks is their rapid delamination with use, requiring frequent replacement (approximately every three months) of the foam blocks on the cutting tools. This delamination can be slowed down by using more efficient, "high-end" foam, which however considerably increases the cost of the cutting tool. This delamination of the foam imposes a rigorous control and replacement of the foam blocks in certain areas, for example in the food sector, because it is essential to prevent pieces of foam from the delamination not being found on the chain. of production.

The cutting of the cardboard also generates a lot of cardboard dust which penetrates into the pores of the foam and the mouths, which greatly reduces the dynamism of the blocks of foam, these losing all their effectiveness. This makes it more difficult to clear the cardboard from the blade. In addition, storing 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 more easily visualize dust and perform dust removal of the foam. This accumulation of dust also imposes a rigorous control and cleaning of the cutting tools in certain areas, such as for example the field of food packaging where hygiene rules are very strict, the tools being cleaned very frequently, in advance , to guarantee the quality of the products.

Summary of the invention

The present invention aims to overcome the aforementioned drawbacks. To this end, the invention relates first of all 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 cardboard cutting tool equipped with one or such compressible ejection elements, as well as a cardboard cutting machine equipped with one or such cutting tools.

The tool according to the invention comprises at least one blade, also called a 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 includes at least one compressible ejection element which is arranged near the blade and configured to push back the cardboard after it has been cut by the blade.

Remarkably, the compressible ejection element according to the invention comprises a multilayer structure comprising at least one base of compressible foam and a protective film coming into contact with the cardboard during the cutting operation. The foam base provides the compressible ejection element with its dynamism allowing it to regain its shape properly after compression has ceased, that is to say during the release of the blade which has just cut the cardboard. The protective film coating the foam base avoids direct contact of this foam base with the cardboard during cutting where said foam base is compressed, which greatly reduces delamination of the latter. In addition, the protective film prevents the penetration of dust into the compressible foam base, which allows it to retain its initial dynamism for good ejection of the cardboard during the release of the tool. In addition, the presence of the protective film makes it possible to collect on its external face the dust from the cardboard generated during cutting, which considerably facilitates the removal of the dust, the external face of the protective film being able to be easily cleaned by means of a damp cloth.

In a preferred embodiment of the compressible ejection element that is the subject of the invention, the foam base is made of an elastomeric material of ethylene vinyl acetate (EVA), chloroprene (CR), styrene-butadiene (SBR) or ethylene type -propylenediene monomer (EPDM). The choice of foam will depend in particular on the price of the tool chosen, which will affect its performance and longevity, although it is optimized by the presence of the protective film, an SBR foam being less robust than a EPDM foam, itself less robust than EVA foam. The type of cardboard to be cut can also affect the choice of foam. Of course, we 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 good resistance to contact with the cardboard during cutting, allows to properly retain dust of cardboard to prevent its infiltration into the pores of the foam base, and allows easy cleaning of its external face with a damp cloth for dust removal, without risk of moisture infiltration in the foam base during cleaning. In addition, the choice of polyester makes it possible to produce a very thin protective film, which makes it possible to work with great precision. This also makes it possible to preserve a large thickness of foam base without modifying the height of the compressible ejection element, compared to that of traditional foam blocks, so that said compressible ejection element retains an adequate 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 already existing cutting tools, replacing the previous foam blocks during maintenance operations. One could obviously envisage 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 which is the subject of the invention, an adhesive coating is applied between an internal face of the protective film and an external face of the foam base, so as to allow the protective film to be bonded with the foam base. Preferably, the coating is deposited on the internal face of the protective film, then the protective film is bonded to the external 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 arranged on the foam base for the bonding of said compressible ejection element on the cutting tool. Preferably, the adhesive coating is deposited on the internal face of the foam base and then and provisionally coated with a sheet of paper before the bonding of the compressible ejection element on the base.

According to the cutting object of the invention, it includes a base also called "a wood". This base is provided with an external face from which extend at least one blade and at least one compressible ejection element. When the cutting tool is used on a flat press, the base is flat and at least one blade and at least one compressible ejection element extend perpendicular to said plane. When the cutting tool is used on a rotary press, the base is circular and at least one blade and 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 bonded 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 foam, as mentioned above. However, one could consider depositing the adhesive coating first on the external face of the base and then depositing 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 arranged respectively on each side of the at least one blade. This allows to properly release both the cut cardboard form and the cardboard scrap, obtained after cutting the cardboard sheet by the blade. The cardboard is ejected from the blade in a balanced manner, which avoids bursting at the edges of the cardboard cutout 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 more easily distinguish the presence of dust on this compressible ejection element, which makes it possible to perform frequent visual checks to clean the protective film when necessary.

According to the cutting tool which is the subject of the invention, it further comprises at least one creasing element which makes it possible to make a groove on the cardboard 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 which are objects of the invention. Preferably, two compressible ejection elements are arranged respectively on each side of the creasing element, in the vicinity thereof, which allows a uniform expulsion of the cardboard.

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

The invention also relates to a carton cutting machine comprising at least one cutting tool which has at least the above 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 die on which is arranged the cutting tool which has a base of planar shape.

This cutting machine can on the contrary be of the rotary press type. In this case, the die is a roller on which the cutting tool is arranged, which has a circular base.

Brief description of the figures

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

Figure 1 shows schematically a side view of a cutting tool implemented on a flat die flat press, showing in particular a blade and a compressible element;

Figure 2 shows schematically a side view of a cutting tool implemented on a circular die of rotary press;

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

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

Figure 5 shows schematically in side view a cutting tool implemented on a flat die of flat press, 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 following description, the cardboard cutting tool is called "the tool" and the cardboard cutting machine is called "the machine".

In FIG. 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 back-and-forth translation movement illustrated by the double-arrow 4. Such a machine 3 is well known to those skilled in the art, it is therefore not detailed. The tool 1 comprises a base 5 on which is mounted a blade 6 which defines an open or closed shape, depending on the cutting of the cardboard to be produced. We can consider several blades 6 defining in combination a shape or even several shapes on the base 5. For example, in Figure 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 allowing the cardboard to be pushed back on one side 9 of the blade 6 adjoining said compressible ejection element 8, so as to prevent the cardboard from gripping said side 9 during the ascent of the blade 6 just cut the cardboard (not shown). The external face 10 of the compressible ejection element 8 extends beyond the end 11 of the blade 6, in normal condition where said compressible ejection element 8 is not stressed, that is to say ie outside of a cardboard cutting phase.

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 roller (or cylinder), the base 5 is circular and the compressible dejection element 8 preferably has the shape of a circular portion.

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 an elastomeric material of styrene-butadiene type (SBR ) which will preferably be used in order to reduce the cost of manufacturing 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 even other compressible foam materials offering good dynamism to the foam base 12 to allow it to quickly return to its normal shape after compression. The protective film 13 is preferably made of a polyester material of white color or any other light color in order to easily visualize the deposits of cardboard dust generated during the cardboard cuts. The external face 14 of the protective film 13 constitutes the external face 10 of the compressible ejection element 8, coming into contact with the cardboard during the cutting and ejection operation. The internal face 15 of the protective film 13 receives an adhesive coating 16 allowing the bonding of said film on the external face 17 of the foam base 12. Similarly, the internal face 18 of the foam base 12 receives an adhesive coating 19 allowing the bonding of said base on the external face 20 of the base 5. The adhesive coating 19 is preferably protected by a strip of paper before the bonding of the compressible ejection element 8 on the base 5.

FIG. 4 shows schematically 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, this 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 translational movement illustrated by the double arrow 4 on the machine 3. Of course, the tool 1 of FIG. 5 will implement characteristics identical or similar to those described above for FIGS. 1 to 4, depending on whether it is a machine 3 of the flat press or rotary press type. As illustrated in FIG. 5, the tool 1 comprises a creasing element 21 which makes it possible to make a groove in the carton when the tool is actuated, this groove defining a fold line on the carton instead a cutout as in the case of the blade 6 previously described. This creasing element 21 is mounted on the base 5. It is possible to envisage several creasing elements 21 on the base, according to the fold lines desired on the cardboard. The tool 1 also comprises two compressible ejection elements 22, 22 ′ of rectangular shape making it possible to push the cardboard from the two sides 23, 23 ′ of the blade 6 adjoining said compressible ejection element 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 illustrated in FIG. L The reverse remains however also possible. One could also consider a single compressible ejection element 24 on one side of the creasing element 21, this solution will however not be preferred for a balancing issue during the expulsion of the cardboard.

The foregoing detailed description is in no way limiting. On the contrary, its aim is to remove any possible inaccuracy as to its scope. Thus, many variants can be envisaged in the context 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 8, 8 'and at their position on the base 5 and vis-à-vis the blade (s) 6. The number of creasing elements 21 and compressible ejection elements 22, 22' will be variable also.

We can also choose other materials than those mentioned in the previous description, for the implementation of the foam base 12 and the protective film 13, without departing from the scope of the invention.

Claims (13)

1. Compressible ejection element (8, 8 ') of a cardboard cutting tool (1) for a cardboard cutting machine (3), characterized in that it comprises a multilayer structure comprising at least one base in compressible foam (12) and a protective film (13) coming into contact with the cardboard during the cutting operation. 2. compressible ejection element (8, 8 ') according to claim 1, in which the foam base (12) is made of an elastomeric material of ethylene vinyl acetate (EVA), chloroprene (CR), styrene type. -butadiene (SBR) or ethylene-propylenediene monomer (EPDM). 3. Compressible ejection element (8, 8 ’) according to one of the preceding claims, in which the protective film (13) is made of a polyester material. 4. compressible ejection element (8, 8 ') according to one of the preceding claims, in which 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, in which an adhesive coating (19) is arranged on the foam base (12) for the bonding of said compressible ejection element on the tool (1 ). 6. Compressible ejection element (8, 8 ’) according to one of the preceding claims, in which 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 repel the cardboard after it has been cut by the blade, said compressible ejection element comprising the characteristics according to either of claims 1 to 6. 8. Cutting tool (1) according to claim 7, which comprises a base (5) provided with an external 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, in which the compressible ejection element (8, 8 ′) is glued 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). ίο 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 near said creasing element, said compressible ejection element comprising the characteristics according to either of claims 1 to 6. 5 12. Cardboard cutting machine (3) comprising at least one cutting tool (1) according to one of claims 7 to 11. 13. Cutting machine (3) according to claim 12, which is of the flat press or rotary press type. 1/2