FR2558769A1 - PROCESS FOR CYCLIC TREATMENT OF A FLOWING FLOOR AND INSTALLATION THEREFOR - Google Patents

Abstract

THE INVENTION RELATES TO A PROCESS FOR THE CYCLIC TREATMENT OF A RUNNING TABLECLOTH AND AN INSTALLATION FOR IMPLEMENTING THE SAID PROCESS. THE INVENTION WILL FIND ITS APPLICATION IN PARTICULAR FOR PRINTING, CUTTING OR PREFORMING BOX EDGES OR OTHER SHAPES FROM A CONTINUOUS STRIP OF CARDBOARD. THE CYCLIC TREATMENT OF TABLE 2 IS ENSURED BY PUNCTUAL CONTACT OF TOOLS 3 GROUPED ON A MATRIX 1. ACCORDING TO THE INVENTION, THE TOOLS 3 ARE ANIMATED WITH A SPEED SYNCHRONIZED WITH THAT OF THE SCREENING TABLE 2, THE POTENTIAL ARE APPLIED PUNCTUALLY. TOOLS 3 ON THE TABLE, WE RELEASE TOOLS 3 BY ENSURING THE CONTINUITY OF THEIR MOVEMENTS ALONG A CLOSED TRAJECTORY BUT A DESYNCHRONISM IS ENSURED AS REGARDS THEIR SPEED IN RELATION TO THAT OF THE TABLE 2. WE THEN APPLY A NEW SCREENING BOTTOM 2 TREATMENT CYCLE. THE INVENTION WILL FOUND ESPECIALLY ITS APPLICATION IN THE PAPER AND BOARD INDUSTRY.

Description

The invention relates to a method of cyclic treatment of a tablecloth

  in runtime and an installation for implementing said method. The invention will find its application particularly in the industry where the materials are treated in continuous strips such as in the paper and cardboard industry and in the

print.

  Currently, some industries use as raw materials a material which is in the form of webs or continuous webs. To simplify handling, we usually treat

  strip along its entire length and then cut into pieces according to a

  matte determined for obtaining the final product.

  This implementation is found particularly in the cardboard industry where the cardboard is produced continuously in large series and then during a recovery operation is cut and printed to form by

example of packaging boxes.

  Depending on the size of the final box to be obtained, we prepare the edges and make cuts and impressions according to a rhythm

cyclic determined.

  These cyclic treatment operations may be carried out according to various methods, the first of which consists in stopping the zone of the cardboard to be treated under a tooling die, in operating the die and, once the treatment is completed, advancing the cardboard strip. a step to renew the operation. This method of work has the disadvantage of requiring discontinuous scrolling of the web which prohibits, for example, placing the series processing machine with the cardboard production machine which it delivers in

continuously the product.

  A second method of treatment which can this time be carried out continuously consists in using a tool-holder die

  disposed on the periphery of a drum. The drum is animated by a

  constant rotation speed synchronized with the scrolling speed

  of the tablecloth of a periodic treatment of the tablecloth in a not de-

  finished which corresponds to the diameter of the tool drum.

  This second method is the most widespread currently. However, it is usually done in recovery operations and installation

  cyclic treatment is not arranged downstream of the machine of pro-

cardboard production, for example.

  Moreover, the geometric characteristics of the drum - 2 -

  make it possible to perform a specific type of treatment and all variations

  dimensional dimensions in the format of the final product to be obtained

  necessarily a modification of the dimensions of the drum. This inconvenience

  was not met with the previous procedure in which the

  One step of the web was independent of the movement of the toolholder.

  One of the aims of the present invention is to present a

  cyclic treatment of a scrolling sheet that allows

  while said sheet is driven by a scroll movement for example

  uniformly ple as it is made at the output of the cardboard production machine, to treat according to an adjustable pitch portions of the tablecloth

scrolling.

  In this way, the tooling becomes universal whatever the

  not adopted, which makes it possible to expand a range of production without

  increase of manufacturing cost.

  Furthermore, the facility for cyclic treatment of a moving sheet according to the present invention may be arranged

  at the output of the cardboard production machine, for example where

  a fully integrated production line that does not require

  no interim recovery operation.

  Another object of the present invention is to present a

  cyclic treatment of a moving sheet in which

  several tool holders are placed in series and work independently.

  with each other according to an adjustable step of o obtaining a

  final product that can be fully adapted as needed.

  Other objects and advantages of the present invention appear

  during the following description, which is not, however,

  given as an indication and which is not intended to limit it.

  The method of cyclic treatment of a moving web, in particular to ensure the printing, cutting or pre-forming of

  box edges or other shapes from a continuous band of car-

  which, by means of one-off contact of tools grouped together on a matrix

  tool is characterized in that: - the tools are animated with a speed synchronized to that of the moving web, - the tools are applied punctually to the web, - the tools are released by ensuring a continuity of their movement along the web. a closed trajectory and desynchronizes their speed relative to that of the web,

  - a treatment cycle is again applied.

  The facility for cyclic treatment of a tablecloth

  particularly to ensure the printing, cutting or pre-forming of the edges of boxes or other forms from a continuous strip of

  carton which comprises at least one transversally arranged

  It is characterized by the fact that the tools are grouped together on an operational circular portion of the drum and that the latter is animated with a circular movement synchronized with the scrolling movement. of the web when the operational circular portion is in contact with the web and in an asynchronous circular motion

  during the remaining portion of the rotation.

  The invention will be better understood on reading the description

  next accompanied by appended drawings among which: - Figures la and b show schematically the cyclic treatment of a moving web, - Figure 2 illustrates an embodiment of a tool holder, - Figure 3 illustrates an installation. cyclic treatment more particularly adapted to pre-forming edges and cutting, - Figure 4 illustrates a cyclic treatment plant equipped with several tool drums arranged in series,

  FIG. 5 illustrates an example of application of the installation

  cyclic treatment for obtaining printed

variable formats.

  The cyclic treatment process of the present invention is more particularly adapted to the treatment of continuous webs by

  scrolling, however, as is apparent from the following description,

  the method of the present invention may also be adapted to discontinuous plies formed of a succession of panels for example

  placed next to one another.

  The method of the present invention will apply to webs regardless of the material used for their manufacture. However, for ease of understanding, it has been chosen to apply the method to the cartonboard industry in which the treatments to be provided are generally the printing, cutting or pre-forming of the cutting edges.

  boots or other forms from a continuous strip of cardboard.

  According to the process of the present invention, the tablecloth is

  It is possible to incorporate the production on a single production line without the need for any intermediate reworking operations. . The scrolling web is processed by spot contact with tools. It could be

  cutting tools, pre-forming tools, or printing relief.

  for example, either individually or in combination. The different

  tools are grouped on a toolholder.

  According to the present invention, the tools are animated with a speed synchronized with that of the moving web. Then, the tools are applied punctually to the sheet in order to carry out the desired treatment operation and once this step has been completed, tools are released, ensuring a continuity of their movement along a closed trajectory. The continuity of the movement makes it possible to apply the same process

  to a matrix and large mass tooling since no accelerations

  brutal ration is not required. Moreover, the closed trajectory allows the treatment to be cyclical since, in its course, the tooling

  periodically comes into contact with the moving web.

  However, a desynchronism of the speed of the tools by

  port to that of the water table is made at the end of the treatment operation.

  when the tools have been released from the contact of the water table. This desynism

  Chronism is important because it makes it possible to vary the periodicity of the treatment of the treatment step on the moving web. By

  acceleration of the speed of the tools, the frequency of

  dye o approximation of the treated areas on the tablecloth. On the other hand, a deceleration of the tooling speed at the end of the treatment phase will slow the treatment frequency by an extension of the pitch separating the treated zones on the moving web. The process

  cyclic embodiment of the present invention is formed by the succession of

previously listed.

  It follows from the process of the present invention that with the same tool-holder matrix, it is possible to produce products of

  different formats without having to modify the geometry of the said matrix.

  This result makes it possible to obtain a whole gamnme of products with a single

tools.

  According to the treatment method of the present invention,

  tools are arranged on a form and the said form is applied

  gentially on the moving tablecloth. This design makes it possible

  -5 - successively and tangentially ply the different layers

  tools to apply a treatment to the tablecloth.

  The method of cyclic treatment of a sheet in scrolling

  can be realized on an installation as shown schematically

  gures la and lb. In this case, the toolholder matrix is

  the shape of a drum 1 tool-holder arranged transversely with respect to

  in the direction of travel of the web 2. The tool drum 1 is movable in rotation and ensures by contact tools 3 a treatment, schematized by a zone 4, hatched in Figures la and lb. According to the invention, the tools 3 are grouped on a portion

  operational circular drum tool holder 1.

  Figure la illustrates the cyclical treatment facility

  in the operational phase, that is to say when the tools 3 are in con-

  2. In this case, the circular movement of the drum 1 is synchronized with the speed of travel of the web 2. It is indeed essential that the tangential velocity of the drum 1 which

  corresponds to the speed of the tools 3 is identical to that of the

  scrolling speed of the web 2 so that the tools 3 can

  perform spot treatment of the water table 2.

  Figure lb illustrates the phase of desynchronization that is

  say when the tool holder operating zone 3 of the drum 1 is no longer in contact with the moving web 2. In this case, there is no longer any contact between the drum 1 and the web 2 and the drum can be animated by an asynchronous circular motion. According to the speed

  synchronous mode, it is possible to adjust the periodicity of the

  provided by the operational circular portion 3 of the drum 1.

  In this way, with the same tool-holder drum 1, it is possible

  ble to treat a scrolling tablecloth 2 according to different formats with

  a gradual adjustment of the latter.

  The treatment plant of the present invention can be improved for example by arranging on the periphery of the tool drum 1 several operational zones obtained by the addition

  to the different toolholder matrices independent of each other.

  The design of the tool-carrying drum illustrated in FIGS. 1a and 1b can also be envisaged without the tools necessarily being fixed on the periphery of the drum 1 as illustrated in FIG.

  In this case, the tools 3 are arranged on an endless belt 5 in circulation.

  between the drum 1 and a second return cylinder 6. The movement 6 - of the tool-holder strip 5 is identical to that previously envisaged

  that is, the speed of the web is synchronized with the

  when the operational zone 3 of tooling is in contact with the sheet 2, on the other hand, as soon as the operational phase is over, the speed of the strip 5 becomes asynchronous and is adjusted according to the periodicity treatment

  to be applied to the tablecloth 2. This conception is particularly

  when the step of the treatment to be applied to the water table

  2 is important. Indeed, in this case, the circular motion

  demanded asynchronous requires to significantly reduce the speed

  gage of the tool drum. In order not to require a deceleration

  ration and a very significant acceleration during this asynchronous phase.

  no, the non-operational circular sector which corresponds to the sector complementary to the sector 3 operating on the drum, must be sufficiently sized. As a result, it is necessary to have a very large tool-carrying drum diameter of a size which can be an inconvenience for the installation. Using the principle

  of the strip 5 disposed between a return roller 6 and a drum

  tool 1, it is possible to set up a non-operational area

  complementary to Operational Zone 3 of relatively large size

  aunt without having an exaggerated size of the installation.

  For the application of certain treatments such as cutting

  of a cardboard tape or the pre-forming of edges on a cardboard tape-

  In this case, it is desirable to have a support of the cardboard strip during the processing operation. An example of realization of such

support is given in Figure 3.

  In this figure 3, where an example of treatment is illustrated

  of a cardboard strip 2 by a tool cylinder 1 provided on its periphery with an operational zone 3, the support 7 is made by

  through a cylinder 7 animated by a circular circular movement

  timed to the scrolling of the cardboard strip 2 which thus ensures

  tangential tact without slip. According to a preferential mode of

  the cylinder 7, it is provided on its periphery with a filling

  8 elastic made of a material such as a polyurethane. The di-

  The dimensions of the cylinder 7 are small as long as it is driven by a peripheral speed substantially equal to that of the strip 2 in movement to provide a tangential support which allows the cutting blades 3 to penetrate into the carton 2. cylinder 7 may for example be driven in rotation by simple contact with the moving strip 2, in which case the synchronism of the movements is

natural 1 ement.

  FIG. 4 schematizes an improved cyclic processing facility of the present invention since it consists of a

  succession of operational posts, in the example chosen here, the name

  number of posts was limited to two. However, a larger number

  positions could be more easily considered. The drums

  9 and 10 are animated independently of one another in a circular motion that synchronize them to the speed of travel of the web 2 when respectively their operational zones 11 and 12

  come into contact with the layer 2 and an asynchronous movement with

  port at the scroll speed of the tablecloth 2 when the drums

  Toolholders 9 and 10 no longer have their circular operating

  11 and 12 in contact with the web 2.

  Each tool drum can apply a 13 and 14 cycle treatment. However, it is desirable to be able to obtain a precise angular setting between the toolholder drums 11 and 12 in order to

  relatively position the operational areas 13 and 14 respectively

  veminent applied by tool drums 9 and 10.

  This decomposition of the treatments applied by the

  9 and 10 allows to vary more fully the finished product. For example

  considering that one of the drums is cutting the web while the other is printing, it is possible to continuously change the format of the finished product by adjusting the cyclic rotational movement of the cutting drum and to position which whatever the format adopted printing for example at the center of the cuts by adjusting the

  rotates the printing drum.

  FIG. 5 illustrates a cyclic treatment facility according to the present invention suitable for obtaining printed cardboard panels 15. The treatment plant of the present invention is fed from a continuously moving strip of cardboard 2 and the tool drum 1 in the example chosen comprises two blades 16

  and 17 tangential which will cut the sides of cardboard 15.

  To facilitate cutting, a counter-cylinder 7 is used which is provided on its periphery with a lining of elastic material. In addition, between the cutting blades 16 and 17, the tool-carrying drum 1 is provided with a

  print buffer 18 which will allow to apply to the flanks of car-

8 -

your 15 a pattern 19 printed.

  In the example chosen, the format of the cut cardboard sides 15 can be varied continuously while still using the same tool-holder drum 1, this with a central positioning of the printing 19. In fact, by varying the angular velocity of the drum

  tool holder 1 during the movement of the cardboard strip 2 under the

  angular beam separating the blades 16 and 17 of the pads 18, the periodicity of the cut is varied by o the dimensions of the flanks 15 and adjusting the speed of rotation of the tool-holder drum 1 so that the times separating the passages from the blade 1 to the pad 18 and the pad 18 to the blade 17 are equal, we obtain a centering

of printing 19.

  Other implementations of the present invention, within the reach of those skilled in the art, could have been adopted without departing

of the frame of it.

9-

Claims (7)

  1. A method of cyclic treatment of a moving sheet, in particular to ensure the printing, cutting or pre-forming of   edges of boxes or other shapes from a continuous band of car-   by one-off contact of tools grouped together on a matrix (3),   characterized in that: - the tools (3) are driven at a synchronized speed to that of the moving web (2), - the tools (3) are applied to the web (2) occasionally, - the tools are released (3) by ensuring a continuity of their movements along a closed trajectory but by desynchronizing their speed with respect to that of the sheet (2),   - a new treatment cycle is applied.   2. Process for cyclic treatment of a moving web   according to claim 1, characterized in that the tools (3) are   bent tangentially to the sheet (2).   3. Installation for cyclic treatment of a tablecloth   for the implementation of the method according to claim 1, which comprises at least one drum (1) tool holder disposed transversely to the running direction of the web (2), movable in rotation and which provides contact treatment (4). ) to the web (2), characterized in that the tools are grouped together on an operational circular portion   (3) of the tool drum (1) and that the latter is driven by a movement   circularly synchronized with the scroll of the web (2) when the operational circular portion (3) is in contact with the web (2) and an asynchronous circular motion during the remaining part   the rotation of said tool-holder drum (1).   4. Installation for cyclic treatment of a tablecloth   according to claim 3, characterized in that the cylinder   toolholder (1) has on its periphery several circular portions operational resources (3).   5. Installation for cyclic treatment of a tablecloth   according to claim 3, characterized in that several   drums (9) and (10) are placed in series in the installation. tion   6. Installation for cyclic treatment of a tablecloth   according to claim 3, characterized by the fact that a counter   cylinder (7) is arranged symmetrically with respect to the web (2) - 10 -   vis-à-vis the tool drum (1), the periphery of which is coated   an elastic lining (8) such as a polyurethane.   7. Installation for cyclic treatment of a tablecloth   according to claim 3, characterized in that the tools (3) are arranged on an endless belt (5) in motion between a drum.   toolholder (1) and a return cylinder (6).