FR2466333A1 - PROCESS FOR THE DELIVERY OF A PLASTIFIED SYNTHETIC MATERIAL, IN PARTICULAR ALONG PARALLEL PLACES - Google Patents

Abstract

Routing of a plasticized synthetic material, in particular along paths arranged in parallel and in particular along channels 16 to 19 arranged in parallel with a distributor of a machine for blowing synthetic materials, in the case of parallel manufacture of several synthetic hollow bodies produced simultaneously and side by side by blowing. The synthetic material is maintained at least approximately the same temperature in the different runs. To this end, a fluid brought into temperature equilibrium, that is to say heated at 22 or cooled at 21, and in particular a liquid brought into temperature equilibrium, circulates at 5 at least over a part of the length of each course, along the wall 20 thereof. (CF DRAWING IN BOPI)

Description

The invention relates to a method for conveying

  plasticised plastic, in particular along

  courses arranged in parallel and in particular through the channels arranged in parallel with a distributor in the case of parallel manufacture of a few hollow bodies of synthetic material, products

  simultaneously and side by side by blowing on a blow machine.

  fler. In a blowing machine for the manufacture of blown hollow bodies, the plastic material being processed is plasticized in an extruder, a state in which it is present.

  a temperature that is specific to each kind of synthetic material

  tick and to which it can undergo subsequent molding operations. Thus, by means of a nozzle, the material is formed into a flexible pipe which is then converted into the desired hollow body in a blow mold. Along this route,

  the endurance of the material during forming must be maintained, which

  essentially for certain types of synthetic

  their instantaneous temperature. This is how it is

  It is necessary to warm up or cool down the material being processed. From this depends the fluidity of

  matter, the importance of which can not be underestimated for the

titude to the forming.

  Problems related to fluidity or fitness for

  forming of the material being processed arise in particular.

  especially when trying to manufacture several

  hollow body of synthetic material, at the same time and side by side.

  The stream of synthetic material leaving the extrusion

  is divided and routed along

  cation arranged in parallel. This is done by means of a distributor which is interposed between the extruder and

  nozzles and which has a system of channels, for example

  a two, three, four or more channel system.

  So far, results have not been achieved

  the formability or fluidity of the

  matter yes was flowing out of the channels was not homo-

gene.

  The object of the invention is to find, for the conveyance

  plasticized synthetic material, a process with which, at the output of each path arranged in parallel, a synthetic mass having the same

forming and the same fluidity.

  This object is achieved according to the invention by the fact that in each individual course, the synthetic material

  at least approximately at the same temperature

  erated by the fact that at least part of the time

  the course of the journey, a fluid in equilibrium

  ture, and in particular a liquid which has been equilibrated

  ture runs along the wall delimiting this course.

  We obtain in this way, in each course arranged

  in parallel, a synthetic material having the same

forming study or fluidity.

  The capital advantage of this process is that the material being processed can be as well

  reheated than cooled. According to an example of

  tion, the temperature is advantageously measured.

  of the fluid on arrival or departure, and the measured quantity is used as a control variable for

  temperature equilibrium, that is to say for the warming

  or cooling of the fluid to be circulated.

  lation. The process of the invention is hereinafter described

  more detailed and explained with the help of drawings which represent

  feel an intended device, for example, for

the execution of this process.

  Fig. 1 of the drawings represents this device under

  schematic shape, partly in longitudinal section.

  Fig. 2 shows in cross section a detail

of this device.

  A plastified synthetic material comes from an ex-

  trudeuse 1. The pudding of matter being processed

  is divided into parallel rolls. At the exit of the extru-

  deuse, it is first hunted along two channels 2 and 3 each of which opens into two successive channels, designated respectively by 12, 13 and 14, 15. These are

  extend into respective channels 16, 17, 18 and 19 which result in

  each weave a nozzle (not shown).

  It is thus formed four courses arranged in parallel

  leler, through which the synthetic material must be conveyed. In each of these paths, the material is maintained at approximately the same temperature, which translates into

  by the same fluidity of matter.

  This result is achieved by the fact that at least a part of the length of each path, a fluid in temperature equilibrium circulates along the wall defining this path. For this purpose, there are provided, all around the course, passages through which circulates

  the fluid, for example an oil equilibrated with tempera-

  ture. In the example shown, a part of the length of the channel is constituted by a sleeve inserted into a bored hole, as indicated by 4 or 20. On its outer surface, the sleeve is provided with a groove 5 which follows a path in propeller, which gives rise to a passage for the circulation of the fluid in temperature equilibrium, all around the course. The sleeve is made by ensuring that the temperature-equilibrated fluid circulates as close as possible to the material to be kept at the same temperature. This promotes a rapid heat transfer, which also

  a good heat conducting material for the sleeve.

  Each of the fluid circulation passages is connected to a circuit where the equilibrium of

fluid temperature.

  This circuit comprises a cooling device 21, a heating device 22, a pump 23 and corresponding connecting lines. The operation of

  circuit is set automatically.

  The temperature of the material that passes through the part of the length of the course is measured and compared

  with set values of this parameter. the cooling

  dehydration or heating of the fluid to be

  free of temperature is set accordingly. The temperature

  The circulating fluid is measured before or after it has delivered heat to the material or has taken heat therefrom. A measuring device

9 is provided for this purpose.

  For simplicity, the process is not described and is not

  shown on the drawings only in one run.

  But the same description applies to other routes

  arranged in parallel, through which the plastic material

is transported.

  Devices are available on the market for automation of the regulation of the temperature equilibrium fluid, regulation which can also

  understand the flow rate of the circulation pump 25.

  If the distributor is subdivided, it is for reasons of

  manufacturing sounds. Its first part, comprising the channels 2, 3 and the sleeves 4, is denoted by 6. A second part comprises the channels 12, 13, 14 and 15. A third part presents the channels 16, 17, 18 and 19 with

the sleeves 20.

  To avoid direct contact between the equilibration fluid of the temperature and the synthetic material, the sleeves inserted in the bored holes are provided with gaskets, which are designated for example

by 8 and 7.

  It would be conceivable to give the passages provided in the sleeves a shape different from that which has been described above. They could for example extend parallel to the axis of the sleeve, be arranged all around

  of it and be fed in parallel fluid.

  The actual heat exchange between the material

  synthetic material and the temperature equilibrium

  may be made, as appropriate, to concurrent or

against a current.

  In the exemplary embodiment, the heat exchange takes place concurrently at the level of the sleeves 4, as in FIG.

that of the sleeves 20.

  In fig. 2, the device mentioned, with steps

  sages 27 and 28 arranged around the parallel sleeve

  to the axis of the latter, is shown in cross-section

  dirty. The synthetic mass is conveyed along the path 25. The passages 27 and 28, that is to say all eight which have been indicated by way of example, can convey the equilibrium fluid of temperature, by the fact they

  connected to intake and exhaust manifolds

  are common. According to another possible embodiment, they may be grouped into groups of four, one of the groups comprising the passage 27, which may be provided for the circulation of heating fluid and the other with

  the passage 28, capable of conveying a cooling fluid,

is lying.

  Similarly, electric heating elements

  could be installed in a group of passages, the passages of the second group ensuring the circulation of a

  fluid put in temperature equilibrium for cooling

is lying.

  Similarly, in the case of a helical arrangement of passengers

  These could be done with a double step.

  One of the steps could then be provided for the installation of the electric heating elements and the second of the steps

  could be used to circulate a cooling fluid

ment.

Claims (1)

BACKGROUND OF THE INVENTION 1. A method for conveying a plasticised synthetic material, especially along paths arranged in parallel and in particular through the channels (16 to 19) arranged in parallel with one another. distributor in the case of parallel manufacture of several hollow bodies of synthetic material produced simultaneously and side-by-side by blowing on a blowing machine, characterized in that in each individual path the synthetic material being processed is maintained at less than the same temperature, in that at least a part of the length of the pathway, a fluid equilibrated with temperature, and in particular a temperature-equilibrated liquid, circulates (at 5) on along the wall (20) defining this path. Method according to Claim 1, characterized in that the temperature of the synthetic material flowing along the path is measured and the measured variable is used as a reference value in a closed loop for the regulation of the flow rate. (in 23) and / or temperature (in 21 and   22) of the fluid equilibrated with temperature.   3. Process according to claim 1, characterized in   the temperature of the incoming or outgoing fluid is measured   (9) and the measuring variable is used as setting variable for the equilibrium of temperature, that is for heating (at 22) or cooling (at 21) of the fluid circulated.   4. A process according to claim 1, characterized in that along the intended portion of the length of the path, the fluid temperature-equilibrium circulates along the wall (20) of this path, through a passage (5) which extends in a helix all around the course.   5.- Method according to claim 1, characterized in that along the portion (25) of the length of the course, the   fluid placed in temperature equilibrium circulates through   sages (27,28) which extend parallel to the course and which are   arranged in close proximity all around the course.