LU86993A1 - PROCESS FOR PRODUCING SHEETS COMPRISING MULTICOLORED STRIPS OF THERMOPLASTIC MATERIALS - Google Patents

Description

ί - · · t I 'GRAND-DUCHÉ DE LUXEMBOURG 52 691 I * I r ’T Prax-at Kîü -. *

Dear Minister, * of September 10, 198V of the Economy and the Middle Classes · Department of Intellectual Property * Title issued ----------------------- ---------------- LUXEMBOURG-

Patent Application _______________________________________________________________; -; - (1) I. Request

The soc ± été_.d.ite.:. ϋΟΕΧΡΑΝ,: ~ 5-.Α ”-, - c / - Sierra-de ~ Guadarraiaar 44 (, 2) - 28830 SAN FERNANDO-DE HENARES ..... MADRID (Spain) —represented—. ..- byMr- Jacques ~ de ~ Muyseragissant-en ~ qualité-de --- s .......... agent _________________________ (- 3) deposits (s) this _d ± x September -1900-guatre-twenty - sept-- · - (4) to 15 _. hours, at the Ministry of the Economy and the Middle Classes, in Luxembourg: 1. this request for obtaining a patent of invention concerning: - "Process-of-manufacturing-of-fedil-les — eomportant— des- (5) - .. tanâes-.multdLcolores-de-matters -thermoplastiques - "" - 2. the description in French language -———---- of the invention in triplicate; 3 .................. // ______________________ ______ drawing boards, in triplicate; 4. the receipt of the fees paid to the Luxembourg Registration Office, 9 -sepfeeittbre -l-987- î 5. the delegation of power, dated ---------- le-; declare (s) assuming responsibility for this declaration, that the inventor (s) is (are): (6) ... see designation — separate ------------- ----------------— claim (s) for the above patent application the priority of one (or more) application (s) of (7) ______________. Patent ---- ----------------------- filed (s) in (8) —Spain-- on (9) 29. .Apr ± l _... 1987 ______________________________________— ................

under N ° (10) J8.7.Q126.9 .________________________________________ in the name of (11) .JLa -déposante _______________________________________________________...--- elect (elect) domicile for him (her) and, if designated, for his representative , in Luxembourg___ ___________________________________ 35 ^ ... „boulevard„ Royal ______________________ (12) sollpatpat) the grant of a patent for the subject described and represented in the abovementioned appendices, with postponement of this grant to ------ -------- μ -------------.- _! _ month. (13)

Lp <lepos) mt / agent: ______________________________ (14) f B. Submission report

The aforementioned patent application has been filed with the Ministry of the Economy and the Middle Classes, Service-already Property InteJléS ^ SÏëiàjôixmbourg, dated: September 1987! S ’\ è \ Pr. The Minister of Economy and the Middle Classes, at .M ---- hours I | / ¾ V '^ || p.d.

\ î \ -jf / The head of the intellectual property department, iUc ^ A 68007 _.__ EXPLANATIONS RELATING TO THE DH DEPOSIT FORM.

(I) if applicable "Application for certificate of addition to the main patent, to the main patent application No ------- of ..........." - (2 ) enter the surname, first name, profession.

address of the applicant, when the applicant is a private individual or company name, legal form, address of the head office, when the applicant is a legal person - (3) enter the name. name. address of the authorized representative. industrial oronriélé council, provided with a special new, if it takes place: "leoréseoté car ............ acting as Agent"

L

; '52.691

CLAIM OF PRIORITY

of the patent application / ’In Spain 1 ·

From April 29, 1987 (No. 8701269): l ·: ·, / Brief Description filed in support of a request for

PATENT

at

Luxembourg ^ on behalf of: COEXPAN, S.A.

28830 SAN FERNANDO DE HENARES MADRID (Spain) for: "process for the production of sheets comprising multicolored strips of thermoplastic materials." ? -> -. · '..

i * r j i * * i · î] i 1 · i. ·. / j j i Process for manufacturing sheets comprising multicolored strips of thermoplastic materials.

]! The present invention relates to a method for manufacturing sheets comprising strips | multicolored thermoplastic materials, this! process presenting, in itself, a series of advances; 5 very important stages in the most modern techniques currently adopted and developed in this industrial field.

Currently, there is a method or; a process of the type described in French patent application no. 85 15621 in which a particular method for obtaining decorated sheets is described, this method or this method posing certain problems during its practical implementation following the creep of certain layers of plastic material with others, thus giving rise to the migration of bands over certain others when bands of distinct colors are used.

Consequently, the subject of the present invention is the manufacture of sheets formed thermally to form with great safety and high quality, the conditions for extrusion or shaping by thermal means being in no way critical as is the case. case in other adopted procedures.

• 25 The final product obtained consists of a support consisting of a layer of plas-! ι. i \ 2 j tick, over which are applied longitudinal strips of different widths, on the 4.

| which, s is deposited an upper layer of one,; transparent and shiny plastic material.

5 The phases of the process which are the subject of the invention are as follows:

First, there is the melting and extrusion of the thermoplastic material in as many extruders as there are colors and 10 different types of plastics, i.e. there is a support layer, six layers 9 colored intermediate layers and an upper layer made of a transparent plastic, it is necessary to provide 8 extraction machines, 15 trusion, that is to say one for each type of plastic used. The plastic. the most commonly used because of its high qualities and characteristics will be polystyrene which, as a raw material, has the fundamental characteristics for its shaping and coloring.

This plastic material becomes flexible at a temperature between 90 and 100 ° C, temperature at which it begins to deform at a higher temperature until reaching, in this process, a constant value of about 210 ° C, temperature which is varied between 190 and 300 ° C in the first batch of the above sheets.

All these molten plastics leave the extruders, then they reach a first plate which distributes them through separate horizontal channels each conveying one of the plastics. In addition to this plate, 35 is provided another distributor which, depending on i 3 I '\ \ Ί * ·· * i -. . · \.

! ‘· I of the conditions required for a band updated to i; shape of one or the other color, distribute] this strip at this level through a conduit, /! centering the desired color to finally reach a central position of desired colors which can be extracted by means of their corresponding conduits. For the shaping of the bands, these conduits conveying the distinct colors are brought to reach an element 10 in the form of a comb in the triangular parts; areas from which the plastic material flows from the top to the outlet, where the different currents meet simultaneously with the other side bands. At the same time, the carrier material and the upper layer of transparent plastic material are distributed respectively by the lower and upper channels, the first being sent through the lower region of the head and the second, through 20 higher until they reach the single point of union with the intermediate colored bands, all these materials being united in the same zone thanks to which / despite different fluidities, physical properties or pressures, these characteristics are balanced without any deviation or any migration of the material from one strip to another, no more than from one layer to the other following the combination of all these materials at the same point of the head.

The thickness of the strips is adjusted when the stream of plastic material reaches the head, by means of which a weak flow necessarily involves the formation of a thin strip, while a higher flow also gives 4 V.

'\ t »-> necessarily result in the formation of a thicker band. .

These variations in thicknesses of the intermediate colored bands is due to the fact that, when shaping the currents emanating from the aforementioned plate, if a thin strip is used in an intense color, one will feel a impression of weakness due to the content of the inner part, since both the support layer is white and it would become transparent due to this thin thickness of the colored strip, so much so that in the intense colors , the thickness of the intermediate colored band is usually slightly greater than in the weak colored bands.

The width of the bands is adjusted by the intervention of the element in the form of a triangular comb in which the dimensions of the sheet are made: in more or less wide bands depending on the width or the extreme output of this element.

On leaving the thermally formed sheet, its total thickness is; 25 adjusted as a result of the deformation of the exit lip of the die or of the shaping die, since a reduction in thickness may take place at the exit, so that the strip thus formed will have a total width 30 delimited by the die used, at a fixed value for each die, while the total thickness of the sheet may vary between 0.6 and 2.4 mm, the shaping elements being distributed in the following thickness percentages: 35 - 3.5 to 6% in the upper layer! '>.

"> ·% \. 5 5; ; transparent and shiny; <- 40 to 60% thickness in the colored bands, and, i - 56.5 to 34% in the thickness of the support material.

Preferably, the speed of formation of the abovementioned sheets is from 7 to 11 m / minute, these values ensuring, for these sheets, a stable and correct shaping, the abovementioned exit speed being obtained by adapting the extruders which will print this impulse to the plastic during its shaping.

At the exit of the head or of the shaping die, the sheet passes through cooling rollers maintained at a constant temperature by internal cooling with water, to then go towards the end of the device where it is collected by being wound into cylindrical windings.

The final operation of this method consists in performing the longitudinal slitting by means of a device having the particularity of detecting the color separation by means of photoelectric cells controlling this slitting device in the long run.

Furthermore, the width of the strips that the sheets comprise, can vary between 3 and 600 mm, this variation resulting from the configuration of the element in the form of an intermediate comb.

Claims (10)

1. Method of manufacturing bands; formed, thermally / formed, / of a layer of support material on which '5 are deposited longitudinal colored bands of identical or different width and thickness over which is deposited a layer of transparent plastic material and bright, characterized in that the basic plastic is first melted and extruded by as many extruders as there are different types of material used as regards their colors and their characteristics, this molten plastic material being transported, following extrusion, to the die for shaping the final strip. 2. Method according to claim 1, characterized in that, because the shaping die determines, at the entry position 20 of the molten plastic, the arrangement of each strip in horizontal channels, each of In their case, the plastic or the desired color is extracted at the desired level for shaping the final strip with the desired color. 3. Method according to claim 1 or 2, characterized in that, as a result of the configuration of the longitudinal layer, the different color is reduced to an intermediate part of the shaping die in the form of a comb which, at its end, joins side bands to each other. 4. Method according to any one of claims 1 to 3, characterized in that, y -v * \:. 7 i - * in the same line, the colored central layers! are joined to the lower support layer and, to the transparent upper layer to exit / in the form of a unitary body whose total thickness is adjusted by deformation, to the exit lip of the matrix. 5. Method according to any one of claims 1 to 4, characterized in that the thickness of the colored longitudinal central layers 10 is regulated by the fact that the feed rate of plastic material can pass through a constriction in the delivery channel to shape for different layers. 6. Method according to any one of claims 1 to 5, characterized in that, at its exit, the shaped strip passes through cooling rollers maintained at constant temperature by circulation of water. 7. Method according to any one of claims 1 to 6, characterized in that the total thickness of strips obtained can vary between 0.6 and 2.4 mm. 8. Method according to any one of claims 1 to 7, characterized in that the strip thickness obtained can vary in the following percentages: 3.5 to 6% in the glossy upper layer; 40 to 60% in the 30 colored central layers, and 56.5 to 34% in the lower layer. 9. Method according to any one of claims 1 to 8, characterized in that the width of the strips can vary between 3 and 35 600 mm. t 'L r *. , \ * '1 i. , ':. . 8 10. Method according to any one of claims 1 to '9, characterized in! that it is carried out at a temperature understood, / i! between a lower limit of 190 ° C and an upper limit of 300 ° C in the shaping die. ! 1 C ! :} i i i i