EP0013515A1 - Process for manufacturing articles with a suede-like finish - Google Patents

Process for manufacturing articles with a suede-like finish Download PDF

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Publication number
EP0013515A1
EP0013515A1 EP79400946A EP79400946A EP0013515A1 EP 0013515 A1 EP0013515 A1 EP 0013515A1 EP 79400946 A EP79400946 A EP 79400946A EP 79400946 A EP79400946 A EP 79400946A EP 0013515 A1 EP0013515 A1 EP 0013515A1
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EP
European Patent Office
Prior art keywords
layer
plastisol
polyvinyl chloride
expansion
blowing agent
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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EP79400946A
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German (de)
French (fr)
Inventor
Laurent X. Brand
Joseph Hinderer
Georges Ludwig
Jean Stemmelin
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Cordoual Sa
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Cordoual Sa
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Publication of EP0013515A1 publication Critical patent/EP0013515A1/en
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    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
    • D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
    • D06N3/04—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof with macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D06N3/06—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof with macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds with polyvinylchloride or its copolymerisation products
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
    • D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
    • D06N3/007—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by mechanical or physical treatments
    • D06N3/0072—Slicing; Manufacturing two webs at one time

Definitions

  • the present invention relates to a method of manufacturing an article in sheet form comprising a layer of polyvinyl chloride having a suede appearance.
  • the most widely used process consists in incorporating into the plastisol a pore-forming agent which decomposes at a temperature below that necessary for the gelling or hardening of the plastisol by forming pores. The surface of the porous layer is then removed by sanding.
  • the present invention aims to improve this process by making it possible to obtain easier and more regular splitting leading to a better appearance of the final material.
  • the subject of the present invention is a process for manufacturing an article in the form of a sheet comprising a layer of polyvinyl chloride having a sueded appearance, of the type consisting in splitting a laminated material by breaking the cells on the surface.
  • a porous layer of polyvinyl chloride this process being characterized in that one performs the splitting of a material comprising a layer of polyvinyl chloride, which contains a blowing agent and is devoid of expansion promoter, and an adjacent layer containing an expansion promoter.
  • pore-forming agent any substance capable of decomposing when hot, forming gases and therefore pores in a hot plastisol.
  • blowing agents those conventionally used are used to form polyvinyl chloride foams.
  • azodicarbonamide has been found to be the preferred blowing agent.
  • blowing agents are conventionally used in admixture with expansion promoters also called kickers which are substances which lower the decomposition temperature of blowing agents.
  • expansion promoters also called kickers which are substances which lower the decomposition temperature of blowing agents.
  • This type of substance is sometimes referred to as a stabilizer for polyvinyl chloride, due to a stabilizing effect which is added to their effect on the breakdown of blowing agents.
  • expansion promoters which are widely known, are generally salts or metal complexes of organic acids, for example cadmium, zinc or lead octonoate, which are sold in the form of a solution in suitable solvents.
  • blowing agent and the expansion promoter are not mixed , the blowing agent being in a layer and the expansion promoter being in an adjacent layer.
  • This adjacent layer may be a layer of a polyvinyl chloride plastisol containing the expansion promoter and devoid of blowing agent or a layer consisting essentially of the expansion promoter.
  • the polyvinyl chloride used in this first layer advantageously has a K value of 65 to 80.
  • the proportions of polyvinyl chloride and of the plasticizer (s) can vary in particular in a ratio of 55/45 to 70/30.
  • the amount of expansion promoter can represent from 0.3 to 15% and in particular from 1 to 10% of the weight of the plastisol.
  • the thickness of the layer is not decisive. It is, for example, deposited at a rate of 100 to 2,000 g / m2.
  • a pre-gelation of the plastisol is carried out at a temperature of 90 to 170 ° C., preferably from ⁇ 110 to 150 ° C., then a layer of a second polyvinyl chloride plastisol containing a blowing agent is deposited on the pre-gelified layer, but not containing an expansion promoter.
  • the polyvinyl chloride used in this second layer advantageously has a K value of 65 to 70.
  • the proportions of polyvinyl chloride and of the plasticizer (s) can vary in particular in a ratio of 45/55 to 70/30.
  • the amount of the blowing agent can represent from 0.1 to 10% and in particular from 0.5 to 5% of the weight of the plastisol.
  • This layer can in particular be deposited at a rate of 150 to 2000 g / m2.
  • This application of the expansion promoter can be carried out in particular at a rate of 0.1 to 5 g / m2, using a varnishing cylinder or by spraying.
  • a second support can then be applied to the layer of plastisol containing the blowing agent, which may in particular be a warp and weft fabric, a jersey, a nonwoven or a compact layer of plastic, for example another layer of plastisol. not containing blowing agent. It is also possible not to apply any other support.
  • a heat treatment is then carried out at a temperature of 160 to 250 ° C and, preferably, from 185 to 225 ° C, so as to cause the decomposition of the blowing agent causing the formation of pores and gelling or hardening plastisols.
  • the laminate material obtained after the heat treatment can also be cooled and rolled up.
  • the splitting can then be carried out separately, for example on a heating drum where, after heating the material to a temperature of 80 to 200 ° C and, preferably, from 110 to 170 ° C, it is possible to separate into two articles the laminate material.
  • the two articles thus obtained can then undergo the known finishing treatments for similar articles: printing, varnishing, graining, in order to adapt the touch and the aesthetic appearance to the desired use (leather goods, clothing, shoes, furniture, sheathing, wall covering).
  • the installation shown in fig. 1 includes a first coating station 1 on a wall paper support 2 coming from a roll 3. After depositing in the coating station 1 a layer 4 of plastisol containing an expansion promoter and not containing of pore-forming agent, the support coated with the plastisol layer passes through an oven 5 where the plastisol layer is heated to a temperature ensuring its pregelification.
  • a fabric 8 from a roll 9 is then applied to the second layer of plastisol and the assembly passes through an oven 10 in which the blowing agent decomposes, forming pores in the plastisol, while this plastisol hardens.
  • the laminated material thus obtained 11 is split into a first ply 12 and a second ply 13 by means of cylinders 14 and 15, and the plies 12 and 13 are air-cooled before be wound on rollers 16 and 17.
  • the material 18 from a roller 19 is applied via a cylinder 20 to a heated cylinder 21 which heats and softens the material 18.
  • This material is separated into two layers 23 and 24 by means of cylinders 2 2 and 25 and the sheets are then cooled, then wound on rollers 26 and 27.
  • FIG. 3 the laminated material before entering the furnace 10 of FIG. 1. It successively comprises a support layer 2, a layer 4 of polyvinyl chloride containing an expansion promoter, a layer 6 of plastisol containing a pore-forming agent and a layer of fabric 8.
  • FIG. 4 There is shown in FIG. 4 the material at the outlet of the oven 10 after the expansion, during the splitting into two layers 12 and 13.
  • Layer 6 of the material after expansion comprises in the vicinity of layer 4 an area 6a in which the pores are significantly larger than in the rest of layer 6 (area 6b).
  • area 6a is torn leaving on the layer-4 a thin film of torn and stretched cells, while the layer 6 also has on the surface torn and stretched cells.
  • Two plies 12 and 13 are thus obtained which each have a surface having a suede appearance.
  • a 100 g / m2 wall paper is used as the first support and a layer of flame retardant plastisol is applied to this support, at a rate of 300 g / m2.
  • Plastisol has the following composition:
  • a 250 g / m2 cotton canvas is applied to this layer.
  • the whole is passed through an oven at a temperature of 200 ° C for a period of 100 seconds. then we split the two layers.
  • a tablecloth on wall paper which has a suede appearance and which can be used as wall covering and, on the other hand, a tablecloth on canvas which can be used in leather goods, possibly after conventional treatments, such as varnishing or embossing.
  • Example 2 The procedure is as in Example 1, but a layer not containing an expansion promoter is used as the first layer of plastisol.
  • the expansion promoter is deposited on this layer at a rate of 2. g / m2 using a varnishing cylinder.
  • composition B the layer of plastisol containing azodicar- b benzenesulfonamide
  • Example 2 The procedure is as in Example 2, but without depositing a first layer of plastisol. After duplication, an article on canvas with a suede appearance is obtained, which can be used in leather goods, and an article on paper with a vinyl chloride deposit of about 50 g / m2 and having a suede appearance.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Synthetic Leather, Interior Materials Or Flexible Sheet Materials (AREA)
  • Laminated Bodies (AREA)

Abstract

Process for manufacturing an article in the form of a sheet with a suede-finish, of the type consisting in splitting a laminar material by rupturing the cells at the surface with a porous layer of polyvinyl chloride, comprising a layer of polyvinyl chloride containing a blowing agent and devoid of any expansion promoter and an adjacent layer containing an expansion promoter. <IMAGE>

Description

La présente invention concerne un procédé de fabrication d'un article sous forme de feuille comportant une couche de chlorure de polyvinyle ayant un aspect suédé.The present invention relates to a method of manufacturing an article in sheet form comprising a layer of polyvinyl chloride having a suede appearance.

On connaît, déjà un certain nombre de procédés permettant d'obtenir un aspect suédé sur des articles enduits d'une couche de chlorure de polyvinyle.A number of methods are already known for obtaining a suede appearance on articles coated with a layer of polyvinyl chloride.

C'est ainsi que l'on a déjà utilisé des procédés consistant, soit à conférer un grainage approprié à l'aide d'un cylindre correspondant au négatif de l'aspect recherché, soit à incorporer dans le plastisol utilisé pour former la couche de chlorure de polyvinyle un produit qui se dissout dans un solvant ou s'évapore à chaud.Thus, methods have already been used which consist either in imparting an appropriate graining with the aid of a cylinder corresponding to the negative of the desired appearance, or in incorporating into the plastisol used to form the layer of polyvinyl chloride a product which dissolves in a solvent or evaporates hot.

Le procédé le plus utilisé consiste à incorporer dans le plastisol un agent porogène qui se décompose à une température inférieure à celle nécessaire à la gélification ou durcissement du plastisol en formant des pores. La surface de la couche poreuse est ensuite éliminée par ponçage.The most widely used process consists in incorporating into the plastisol a pore-forming agent which decomposes at a temperature below that necessary for the gelling or hardening of the plastisol by forming pores. The surface of the porous layer is then removed by sanding.

Toutefois, l'aspect suédé obtenu selon ces divers procédés n'est pastotalement satisfaisant.However, the suede appearance obtained according to these various methods is not totally satisfactory.

Plus récemment, dans le brevet FR 1 '578 424, on a proposé d'obtenir des articles présentant un aspect suédé amélioré par dédoublement d'un matériau stratifié par rupture des cellules à la surface d'une couche poreuse de chlorure de polyvinyle.More recently, in patent FR 1 578 424, it has been proposed to obtain articles having an improved suede appearance by splitting of a laminated material by rupture of the cells on the surface of a porous layer of polyvinyl chloride.

Selon un mode de réalisation préféré de ce procédé, on applique l'une sur l'autre deux couches de chlorure de polyvinyle contenant chacune un agent porogène décomposable à la chaleur, on décompose l'agent porogène et on dédouble le matériau stratifié comportant deux couches poreuses par rupture des cellules à l'in- terface des deux couches.According to a preferred embodiment of this process, one applies to the other two layers of polyvinyl chloride each containing a blowing agent decomposable to heat, the blowing agent is decomposed and the laminated material comprising two layers is split porous by cell disruption to the in- ter f ace of the two layers.

La présente invention vise à améliorer ce procédé en permettant d'obtenir un dédoublement plus facile et plus régulier conduisant à un meilleur aspect du matériau final.The present invention aims to improve this process by making it possible to obtain easier and more regular splitting leading to a better appearance of the final material.

A cet effet, la présente invention a pour.objet un procédé de fabrication d'un article sous forme de feuille comportant une couche de chlorure de polyvinyle ayant un aspect suédé, du type consistant à dédoubler un matériau stratifié par rupture des cellules à la surface d.'une couche poreuse de chlorure de polyvinyle, ce procédé étant caractérisé en ce que l'on effectue le dédoublement d'un matériau comportant une couche de chlorure de polyvinyle, qui contient un agent porogène et est dépourvue de promoteur d'expansion, et une couche adjacente contenant un promoteur d'expansion.To this end, the subject of the present invention is a process for manufacturing an article in the form of a sheet comprising a layer of polyvinyl chloride having a sueded appearance, of the type consisting in splitting a laminated material by breaking the cells on the surface. d. a porous layer of polyvinyl chloride, this process being characterized in that one performs the splitting of a material comprising a layer of polyvinyl chloride, which contains a blowing agent and is devoid of expansion promoter, and an adjacent layer containing an expansion promoter.

Dans la présente invention, par agent porogène on désigne toute substance susceptible de se décomposer à chaud en formant des gaz et donc des pores dans un plastisol chaud. Comme agents porogènes, on utilise ceux qui sont classiquement utilisés pour former des mousses de chlorure de polyvinyle. A cet effet, l'azodicarbo- namide s'est révélé être l'agent porogène préféré.In the present invention, by pore-forming agent is meant any substance capable of decomposing when hot, forming gases and therefore pores in a hot plastisol. As blowing agents, those conventionally used are used to form polyvinyl chloride foams. To this end, azodicarbonamide has been found to be the preferred blowing agent.

Ces agents porogènes sont classiquement utilisés en mélange avec des promoteurs d'expansion également appelés kickers qui sont des substances qui abaissent la température de décomposition des agents porogènes. Ce type de substance est parfois désigné sous le nom de stabilisant pour chlorure de polyvinyle, en raison d'un effet de stabilisation qui vient s'ajouter à leur effet sur la décomposition des agents porogènes. Ces promoteurs d'expansion, largement connus, sont généralement des sels ou des complexes métalliques d'acides organiques, par exemple l'octonoate de cadmium, de zinc ou de plomb, qui sont vendus sous forme de solution dans des solvants appropriés.These blowing agents are conventionally used in admixture with expansion promoters also called kickers which are substances which lower the decomposition temperature of blowing agents. This type of substance is sometimes referred to as a stabilizer for polyvinyl chloride, due to a stabilizing effect which is added to their effect on the breakdown of blowing agents. These expansion promoters, which are widely known, are generally salts or metal complexes of organic acids, for example cadmium, zinc or lead octonoate, which are sold in the form of a solution in suitable solvents.

Ainsi, alors que, dans la technique antérieure, on utilisait des couches de chlorure de polyvinyle contenant à la fois un agent porogène et un promoteur d'expansion, selon la présente invention l'agent porogène et le promoteur d'expansion ne sont pas mélangés, l'agent porogène étant dans une couche et le promoteur d'expansion étant dans une couche adjacente.Thus, while in the prior art, polyvinyl chloride layers containing both a blowing agent and an expansion promoter were used, according to the present invention the blowing agent and the expansion promoter are not mixed , the blowing agent being in a layer and the expansion promoter being in an adjacent layer.

Cette couche adjacente peut être une couche d'un plastisol de chlorure de polyvinyle contenant le promoteur d'expansion et dépourvu d'agent porogène ou une couche constituée essentiellement du promoteur d'expansion.This adjacent layer may be a layer of a polyvinyl chloride plastisol containing the expansion promoter and devoid of blowing agent or a layer consisting essentially of the expansion promoter.

Grâce à cette répartition séparée des deux agents actifs, on obtient lors du chauffage une expansion de la couche contenant l'agent porogène qui est plus importante au voisinage de l'interface des deux couches et qui favorise le dédoublement ultérieur.Thanks to this separate distribution of the two active agents, an expansion of the layer containing the pore-forming agent is obtained during heating, which is greater in the vicinity of the interface of the two layers and which promotes subsequent splitting.

La formation du matériau stratifié utilisé dans la présente invention peut être effectuée de la façon suivante :

  • Sur un support présentant une résistance thermique suffisante et susceptible de retenir un plastisol sans être traversé par lui, par exemple une feuille de papier, un tissu chaîne et trame ou un non tissé, on dépose une couche d'un plastisol de chlorure de polyvinyle contenant un promoteur d'expansion mais ne contenant pas d'agent porogène.
The formation of the laminated material used in the present invention can be carried out as follows:
  • On a support having sufficient thermal resistance and capable of retaining a plastisol without being crossed by it, for example a sheet of paper, a warp and weft fabric or a nonwoven, a layer of a plastisol of polyvinyl chloride containing an expansion promoter but not containing a blowing agent is deposited.

Le chlorure de polyvinyle utilisé dans cette première couche a avantageusement une valeur K de 65 à 80. Les proportions de chlorure de polyvinyle et du ou des plastifiants peut varier notamment dans un rapport de 55/45 à 70/30.The polyvinyl chloride used in this first layer advantageously has a K value of 65 to 80. The proportions of polyvinyl chloride and of the plasticizer (s) can vary in particular in a ratio of 55/45 to 70/30.

La quantité de promoteur d'expansion peut représenter de 0,3 à 15 % et notamment de 1 à 10 % du poids du plastisol.The amount of expansion promoter can represent from 0.3 to 15% and in particular from 1 to 10% of the weight of the plastisol.

L'épaisseur de la couche n'est pas déterminante. Elle est par exemple déposée à raison de 100 à 2 000 g/m2.The thickness of the layer is not decisive. It is, for example, deposited at a rate of 100 to 2,000 g / m2.

On effectue une prégélification du plastisol à une température de 90 à 170°C, de préférence de-110 à 150°C, puis on dépose sur la couche prégélifiée une couche d'un second plastisol de chlorure de polyvinyle contenant un agent porogène, mais ne contenant pas de promoteur d'expansion.A pre-gelation of the plastisol is carried out at a temperature of 90 to 170 ° C., preferably from −110 to 150 ° C., then a layer of a second polyvinyl chloride plastisol containing a blowing agent is deposited on the pre-gelified layer, but not containing an expansion promoter.

Le chlorure de polyvinyle utilisé dans cette seconde couche a avantageusement une valeur K de 65 à 70. Les proportions du chlorure de polyvinyle et du ou des plastifiants peut varier notamment dans un rapport de 45/55 à 70/30. La quantité de l'agent porogène peut représenter de 0,1 à 10 % et notamment de 0,5 à 5 % du poids du plastisol.The polyvinyl chloride used in this second layer advantageously has a K value of 65 to 70. The proportions of polyvinyl chloride and of the plasticizer (s) can vary in particular in a ratio of 45/55 to 70/30. The amount of the blowing agent can represent from 0.1 to 10% and in particular from 0.5 to 5% of the weight of the plastisol.

Cette couche peut être notamment déposée à raison de 150 à 2000 g/m2.This layer can in particular be deposited at a rate of 150 to 2000 g / m2.

En variante, au lieu de déposer sur le support successivement une couche de plastisol contenant un promoteur d'expansion, puis une couche de plastisol contenant un agent porogène, il est possible de déposer d'abord une couche de plastisol ne contenant ni promoteur d'expansion, ni agent porogène, puis d'appliquer le promoteur d'expansion et après prégélification une couche de plastisol contenant un agent porogène.As a variant, instead of depositing successively on a support a layer of plastisol containing an expansion promoter, then a layer of plastisol containing a pore-forming agent, it is possible to first deposit a layer of plastisol containing neither promoter of expansion, no blowing agent, then apply the expansion promoter and after pregelling a layer of plastisol containing a pore-forming agent.

Il est également possible de supprimer la première couche de plastisol et de déposer directement sur un support de type papier une couche de promoteur d'expansion, puis la couche de plastisol contenant l'agent porogène.It is also possible to remove the first layer of plastisol and to deposit directly on a paper-type support a layer of expansion promoter, then the layer of plastisol containing the blowing agent.

Cette application du promoteur d'expansion peut être effectuée à raison notamment de 0,1 à 5 g/m2, à l'aide d'un cylindre vernisseur ou par pulvérisation. On peut alors appliquer sur la couche de plastisol contenant l'agent porogène un deuxième support qui peut être notamment un tissu chaîne et trame, un jersey, un non tissé ou une couche compacte d'une matière plastique, par exemple une autre couche de plastisol ne contenant pas d'agent porogène. On peut également ne pas appliquer d'autre support.This application of the expansion promoter can be carried out in particular at a rate of 0.1 to 5 g / m2, using a varnishing cylinder or by spraying. A second support can then be applied to the layer of plastisol containing the blowing agent, which may in particular be a warp and weft fabric, a jersey, a nonwoven or a compact layer of plastic, for example another layer of plastisol. not containing blowing agent. It is also possible not to apply any other support.

On effectue alors un traitement thermique à une température de 160 à 250°C et, de préférence, ,de 185 à 225°C, de façon à provoquer la décomposition de l'agent porogène entraînant la formation de pores et la gélification ou le durcissement des plastisols.A heat treatment is then carried out at a temperature of 160 to 250 ° C and, preferably, from 185 to 225 ° C, so as to cause the decomposition of the blowing agent causing the formation of pores and gelling or hardening plastisols.

Immédiatement après ce traitement, thermique, alors que le matériau stratifié est encore chaud,- on dédouble le matériau et on obtient ainsi deux articles comportant chacun une surface présentant un aspect suédé.Immediately after this heat treatment, while the laminated material is still hot, - the material is split and two articles are thus obtained, each comprising a surface having a suede appearance.

En variante, on peut également refroidir le matériau stratifié obtenu après le traitementthermique et l'enrouler. Le dédoublement peut alors être effectué séparément, par exemple sur un tambour chauffant où, après réchauffement du matériau à une température de 80 à 200°C et, de préférence, de 110 à 170°C, il est possible de séparer en deux articles le matériau stratifié.Alternatively, the laminate material obtained after the heat treatment can also be cooled and rolled up. The splitting can then be carried out separately, for example on a heating drum where, after heating the material to a temperature of 80 to 200 ° C and, preferably, from 110 to 170 ° C, it is possible to separate into two articles the laminate material.

Les deux articles ainsi obtenus peuvent ensuite subir les traitements de finition connus pour des articles analogues : impression, vernissage, grainage, afin d'en adapter le toucher et l'aspect esthétique à l'usage recherché (maroquinerie, vêtements, chaussures, ameublement, gainerie, revêtement mural).The two articles thus obtained can then undergo the known finishing treatments for similar articles: printing, varnishing, graining, in order to adapt the touch and the aesthetic appearance to the desired use (leather goods, clothing, shoes, furniture, sheathing, wall covering).

D'autres éléments, buts et avantages de la présente invention apparaîtront à la lecture de la description qui va suivre, faite en regard des dessins annexés.Other elements, objects and advantages of the present invention will appear on reading the description which follows, made with reference to the accompanying drawings.

Sur ces dessins :

  • la'fig. 1 représente une installation pour la mise en oeuvre de l'invention;
  • la fig. 2 représente une installation pour le dédoublement d'un matériau stratifié obtenu selon l'invention;
  • la fig. 3 représente le-matériau stratifié avant l'expansion; et
  • la fig. 4 représente le matériau stratifié après l'expansion et en cours de dédoublement.
In these drawings:
  • la'fig. 1 shows an installation for implementing the invention;
  • fig. 2 shows an installation for the splitting of a laminated material obtained according to the invention;
  • fig. 3 shows the material laminated before expansion; and
  • fig. 4 shows the laminated material after expansion and being split.

L'installation représentée sur la fig. 1 comprend un premier poste d'enduction 1 sur un support de papier tenture 2 provenant d'un rouleau 3. Après le dépôt dans le poste d'enduction 1 d'une couche 4 de plastisol contenant un promoteur d'expansion et ne contenant pas d'agent porogène, le support revêtu de la couche de plastisol passe dans un four 5 où la couche de plastisol est chauffée à une température assurant sa prégélification.The installation shown in fig. 1 includes a first coating station 1 on a wall paper support 2 coming from a roll 3. After depositing in the coating station 1 a layer 4 of plastisol containing an expansion promoter and not containing of pore-forming agent, the support coated with the plastisol layer passes through an oven 5 where the plastisol layer is heated to a temperature ensuring its pregelification.

Après la sortie du four, une couche de plastisol 6 contenant un agent porogène, mais ne contenant pas de promoteur d'expansion est déposée dans un second poste d'enduction 7 sur la couche prégélifiée.After removal from the oven, a plastisol layer 6 containing a pore-forming agent, but not containing an expansion promoter, is deposited in a second coating station 7 on the pregelified layer.

Une étoffe8provenant d'un rouléau 9 est alors appliqué sur la deuxième couche de plastisol et l'ensemble passe dans un four 10 dans lequel l'agent porogène se décompose en formant des pores dans le plastisol, tandis que ce plastisol se durcit.A fabric 8 from a roll 9 is then applied to the second layer of plastisol and the assembly passes through an oven 10 in which the blowing agent decomposes, forming pores in the plastisol, while this plastisol hardens.

A la sortie du four 10, le matériau stratifié ainsi obtenu 11 est dédoublé en une première nappe 12 et une seconde nappe 13 à l'aide de cylindres 14 et 15, et les nappes 12 et 13 sont refroidies à l'air avant d'être enroulées sur des rouleaux 16 et 17.On leaving the oven 10, the laminated material thus obtained 11 is split into a first ply 12 and a second ply 13 by means of cylinders 14 and 15, and the plies 12 and 13 are air-cooled before be wound on rollers 16 and 17.

On a représente sur la fig. 2 une installation pour le dédoublement d'un matériau stratifié refroidi qui peut être obtenu à la sortie du four 10 représenté sur la fig. 1 lorsqu'on n'effectue pas le dédoublement.We have shown in fig. 2 an installation for the splitting of a cooled laminated material which can be obtained at the outlet of the oven 10 shown in FIG. 1 when there is no duplication.

Le matériau 18 provenant d'un rouleau 19 est appliqué par l'intermédiaire d'un cylindre 20 sur un cylindre 21 chauffé qui réchauffe et ramollit le matériau 18. Ce matériau est séparé en deux nappes 23 et 24 grâce à des cylindres 22 et 25 et les nappes sont ensuite refroidies, puis enroulées sur des rouleaux 26 et 27.The material 18 from a roller 19 is applied via a cylinder 20 to a heated cylinder 21 which heats and softens the material 18. This material is separated into two layers 23 and 24 by means of cylinders 2 2 and 25 and the sheets are then cooled, then wound on rollers 26 and 27.

On a représenté sur la fig. 3 le matériau stratifié avant son entrée dans le four 10 de la fig. 1. Il comprend successivement une couche de support 2, une couche 4 de chlorure de polyvinyle contenant-un promoteur d'expansion, une couche 6 de plastisol contenant un agent porogène et une couche de l'étoffe 8.There is shown in FIG. 3 the laminated material before entering the furnace 10 of FIG. 1. It successively comprises a support layer 2, a layer 4 of polyvinyl chloride containing an expansion promoter, a layer 6 of plastisol containing a pore-forming agent and a layer of fabric 8.

On a représenté sur la fig. 4 le matériau à la sortie du four 10 après l'expansion, lors du dédoublement en deux couches 12 et 13.There is shown in FIG. 4 the material at the outlet of the oven 10 after the expansion, during the splitting into two layers 12 and 13.

La couche 6 du matériau après expansion comporte au voisinage de la couche 4 une zone 6a dans laquelle les pores sont nettement plus gros que dans le reste de la couche 6 (zone 6b). Lors du dédoublement, la .zone 6a est déchirée en laissant sur la couche-4 une fine pellicule de cellules déchirées et étirées, tandis que la couche 6 présente également en surface des cellules déchirées et étirées. On obtient ainsi deux nappes 12 et 13 qui présentent chacune une surface ayant un aspect suédé.Layer 6 of the material after expansion comprises in the vicinity of layer 4 an area 6a in which the pores are significantly larger than in the rest of layer 6 (area 6b). During the splitting, the zone 6a is torn leaving on the layer-4 a thin film of torn and stretched cells, while the layer 6 also has on the surface torn and stretched cells. Two plies 12 and 13 are thus obtained which each have a surface having a suede appearance.

On donnera ci-après des exemples concrets réalisation de l'invention.Concrete examples of the invention will be given below.

EXEMPLE 1EXAMPLE 1

On utilise comme premier support un-papier tenture de 100 g/m2 et on applique sur ce support, à raison de 300 g/m2 une couche d'un plastisol ignifugé.A 100 g / m2 wall paper is used as the first support and a layer of flame retardant plastisol is applied to this support, at a rate of 300 g / m2.

Le plastisol a la composition suivante :

Figure imgb0001
Plastisol has the following composition:
Figure imgb0001

Après prégélification à 130°C; on applique sur cette couche, à raison de 500 g/m2, une deuxième couche ayant la composition suivante :

Figure imgb0002
After pregelification at 130 ° C; a second layer having the following composition is applied to this layer, at a rate of 500 g / m2:
Figure imgb0002

On applique sur cette couche une toile- coton de 250 g/m2. On fait passer l'ensemble dans un four à une température de 200°C pendant une durée de 100 seconde. puis on dédouble les deux nappes.A 250 g / m2 cotton canvas is applied to this layer. The whole is passed through an oven at a temperature of 200 ° C for a period of 100 seconds. then we split the two layers.

On obtient d'une part une nappe sur papier tenture qui présente un aspect suédé et qui peut être utilisée comme revêtement mural et, d'autre part, une nappe sur toile qui peut être utilisée en maroquinerie, éventuellement après les traitements classiques, tels que vernissage ou grainage.One obtains on the one hand a tablecloth on wall paper which has a suede appearance and which can be used as wall covering and, on the other hand, a tablecloth on canvas which can be used in leather goods, possibly after conventional treatments, such as varnishing or embossing.

EXEMPLE 2EXAMPLE 2

On opère comme à l'exemple 1, mais on utilise comme première couche de plastisol une couche ne contenant pas de promoteur d'expansion. On dépose sur cette couche le promoteur d'expansion à raison de 2. g/m2 à l'aide d'un cylindre vernisseur. Après prégélification, on dépose la couche de plastisol contenant l'azodicar- bonamide (composition B) et on poursuit les opérations comme à l'exemple 1.The procedure is as in Example 1, but a layer not containing an expansion promoter is used as the first layer of plastisol. The expansion promoter is deposited on this layer at a rate of 2. g / m2 using a varnishing cylinder. Following pre-gelling is deposited the layer of plastisol containing azodicar- b benzenesulfonamide (composition B) and the operation is continued as in Example 1.

On obtient des résultats très semblqbles à ceux obtenus à l'exemple 1.Very similar results are obtained to those obtained in Example 1.

EXEMPLE 3EXAMPLE 3

On opère comme à l'exemple 2, mais-sans déposer une première couche de plastisol. On obtient après dédoublement un article sur toile présentant un aspect suédé, qui peut être utilisé en maroquinerie, et un article sur papier présentant un dépôt de chlorure de vinyle d'environ 50 g/m2 et ayant un aspect suédé.The procedure is as in Example 2, but without depositing a first layer of plastisol. After duplication, an article on canvas with a suede appearance is obtained, which can be used in leather goods, and an article on paper with a vinyl chloride deposit of about 50 g / m2 and having a suede appearance.

Claims (10)

1. Procédé de fabrication d'un article sous forme de feuille comportant une couche de chlorure de polyvinyle ayant un aspect suédé, du type consistant à dédoubler un matériau stratifié par rupture des cellules à la surface d'une couche poreuse de chlorure de polyvinyle, ce procédé étant caractérisé en ce que l'on effectue le dédoublement d'un matériau comportant une couche de chlorure de polyvinyle, qui contient un agent porogène et est dépourvue de promoteur d'expansion et une couche adjacente contenant un promoteur d'expansion.1. Method for manufacturing an article in the form of a sheet comprising a layer of polyvinyl chloride having a sueded appearance, of the type consisting in splitting a laminated material by rupture of the cells on the surface of a porous layer of polyvinyl chloride, this process being characterized in that one performs the splitting of a material comprising a layer of polyvinyl chloride, which contains a pore-forming agent and is devoid of expansion promoter and an adjacent layer containing an expansion promoter. 2. Procédé selon la revendication 1, caractérisé en ce qu'on dépose sur un support un plastisol de chlorure de polyvinyle contenant un promoteur d'expansion mais ne contenant pas d'agent porogène, on effectue une prégélification du plastisol, on dépose sur la couche prégélifiée une couche d'un second plastisol de chlorure de polyvinyle contenant un agent porogène mais ne contenant pas de promoteur d'expansion, on effectue un-traitement thermique à une température de 160 à 250°C de façon à provoquer la décomposition de l'agent porogène et le durcissement des plastisols, puis on dédouble le matériau stratifié ainsi obtenu en deùx nappes comportant chacune une surface présentant un aspect suédé.2. Method according to claim 1, characterized in that a plastisol of polyvinyl chloride containing an expansion promoter but not containing a pore-forming agent is deposited on a support, a pre-gelification of the plastisol is carried out, it is deposited on the pre-gelified layer a layer of a second plastisol of polyvinyl chloride containing a pore-forming agent but not containing an expansion promoter, a heat treatment is carried out at a temperature of 160 to 250 ° C. so as to cause the decomposition of the the blowing agent and the hardening of the plastisols, then the laminated material thus obtained is split into two plies each having a surface having a suede appearance. 3. Procédé selon la revendication 2, caractérisé en ce qu'on applique avant le traitement thermique un deuxième support.3. Method according to claim 2, characterized in that a second support is applied before the heat treatment. 4. Procédé selon l'une-quelconque des revendications 1 à 3, caractérisé en ce que le chlorure de polyvinyle dans la couche contenant le promoteur d'expansion a une valeur K de 65 à 80.4. Method according to any one of claims 1 to 3, characterized in that the polyvinyl chloride in the layer containing the expansion promoter has a K value of 65 to 80. 5. Procédé selon l'une quelconque des reven- dications 1 à 4, caractérisé en ce que le promoteur d'expansion est présent dans l'une des couches, à raison de 0,3 à 15 % du poids de plastisol.5. A method according to any one of reven- ications of 1 to 4, characterized in that the expansion promoter is present in one of the layers in an amount of 0.3 to 15% by weight of the plastisol. 6. Procédé selon l'une quelconque des revendications 1 à 5, caractérisé en ce que le chlorure de polyvinyle dans la couche contenant l'agent porogène a une valeur K de 65 à 70.6. Method according to any one of claims 1 to 5, characterized in that the polyvinyl chloride in the layer containing the blowing agent has a K value of 65 to 70. 7. Procédé selon l'une quelconque des revendications 1 à 6, caractérisé en ce que l'agent porogène est présent dans l'une des couches à raison de 0,1 à 10 % du poids du plastisol.7. Method according to any one of claims 1 to 6, characterized in that the blowing agent is present in one of the layers in an amount of 0.1 to 10% of the weight of the plastisol. 8. Procédé selon la revendication-1, caractérisé en ce qu'on dépose sur un support une couche de plastisol ne contenant ni agent porogène, ni promoteur d'expansion, on applique ensuite le promoteur d'expansion et, après prégélification, une couche de plastisol contenant un agent porogène, on effectue un traitement thermique à une température de 160 à 250°C, de façon à provoquer la décomposition de l'agent porogène et le durcissement des plastisols, puis on dédouble le matériau stratifié ainsi obtenu en deux nappes comportant chacune une surface présentant un aspect suédé.8. Method according to claim-1, characterized in that a plastisol layer containing no blowing agent or expansion promoter is deposited on a support, the expansion promoter is then applied and, after pregelling, a layer of plastisol containing a blowing agent, a heat treatment is carried out at a temperature of 160 to 250 ° C., so as to cause the decomposition of the blowing agent and the hardening of the plastisols, then the laminated material thus obtained is split into two layers each having a surface having a suede appearance. 9. Procédé selon la revendication 1, caractérisé en ce qu'on dépose sur un support de type papier une couche de promoteur d'expansion, puis une couche de plastisol contenant un agent porogène, on effectue un traitement thermique à une température de 160. à 250°C, de façon à provoquer la décomposition de l'agent porogène et le durcissement du plastisol, puis on dédouble le matériau stratifié ainsi obtenu en deux nappes comportant chacune une surface présentant un aspect suédé.9. Method according to claim 1, characterized in that a layer of expansion promoter is deposited on a paper-type support, then a layer of plastisol containing a pore-forming agent, heat treatment is carried out at a temperature of 160. at 250 ° C, so as to cause the decomposition of the blowing agent and the hardening of the plastisol, then the laminated material thus obtained is split into two layers each having a surface having a suede appearance. 10. Procédé selon la revendication 8 ou la revendication 9, caractérisé en ce qu'on applique de 0,1 à 5 g/m2 de promoteur d'expansion.10. Method according to claim 8 or claim 9, characterized in that 0.1 to 5 g / m2 of expansion promoter is applied.
EP79400946A 1979-01-11 1979-12-03 Process for manufacturing articles with a suede-like finish Withdrawn EP0013515A1 (en)

Applications Claiming Priority (2)

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FR7900658 1979-01-11
FR7900658A FR2446181A1 (en) 1979-01-11 1979-01-11 PROCESS FOR THE MANUFACTURE OF ARTICLES HAVING A SWEDISH LOOK

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1531941A (en) * 1966-07-26 1968-07-05 Huels Chemische Werke Ag Process for the preparation of synthetic leather based on polyvinyl chloride, in the form of a foam product which is practically waterproof and suitable for breathing
FR1578424A (en) * 1967-08-17 1969-08-14
FR2115673A5 (en) * 1970-11-27 1972-07-07 Omnium De Prospective Ind Sa
FR2235796A1 (en) * 1973-07-06 1975-01-31 Marley Tile Ag

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1531941A (en) * 1966-07-26 1968-07-05 Huels Chemische Werke Ag Process for the preparation of synthetic leather based on polyvinyl chloride, in the form of a foam product which is practically waterproof and suitable for breathing
FR1578424A (en) * 1967-08-17 1969-08-14
FR2115673A5 (en) * 1970-11-27 1972-07-07 Omnium De Prospective Ind Sa
FR2235796A1 (en) * 1973-07-06 1975-01-31 Marley Tile Ag

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