DE2037989A1 - - Google Patents

Description

"Matern material for the production of duplicate clichés ¹¹

Priority: July 31, 1969, V.St.A., no.846 341

The invention relates to a mat material which can be used in the printing industry. In particular, the invention relates to a for Production of duplicate klisehees (stereos) for high-speed presses usable matern material.

The production of duplicate klisehees (stereos) is special for printing newspapers, magazines, brochures and the like, important that are printed on a high-pressure rotary press. The production of duplicate clichés is also of great importance

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for those print jobs for which the same due to scheduling reasons Work has to be printed on several machines at the same time.

Advantages; Their printing properties are at least as good, if not better, than the printing properties of the original. Duplicate clichés can be easily exchanged. They protect the original printing block from wear and tear in the printing machine. Also, duplicate clichés can be created without difficulty bent and so well adapted to the requirements in rotary machines. * ·

A known method for the production of duplicate clichés according to the so-called "Stereotypie-Verfehren ™" is carried out in der Hegel as follows: First the original ^{printing block is clamped into a steel frame called a "closing frame 11} " or "BOrmrahmen". A sheet-shaped Hohmater, made from a cellulose mass, coated with wax and optionally treated with a release agent, is then placed on the closing or Pormrahmen and pressed onto the original printing block. A lifelike replica of the original printing block, a so-called mater, is embossed from the raw material. The mater is then poured out with molten lead. After cooling and hardening, the lead, taken from the material, gives the so-called stereo or duplicate claw. This method can be modified by using plates made of rubber or a suitable plastic or any plastic compound instead of lead. To form the duplicate r

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clichés these rubber or plastic sheets against the Pressed Mater or molded plastic compounds poured into the Mater.

The offer of new starting materials for the production of duplicate clichés that are maximally adapted to the new high-speed rotary presses in terms of their reproduction accuracy and service life as well as the fineness of their screen dots and their printability are coordinated, has created a need for a mat material that accepts the new starting materials for the production of duplicate clichés in a V / eise forms and in'Form of printing plates that this releases the highest . Requirements in the named properties meet.

As polymeric starting materials for the production of Unsaturated polyester casting resins have proven to be suitable for duplicate clichés. The known matern materials, for example the mats made from cellulose materials impregnated with phenolic resins are not suitable for production high quality, curved duplicate clichés when used as a material for polyester resins. Here difficulties occurred with the faithful reproduction of line etchings, fonts, combined templates or Original artwork and patterns applied to wood or metal. There was excessive shrinkage and deformation, to an uneven formation of the deeper lying and the raised areas and to a letter deformation. These There were already disadvantages with the respective mater himself noticeable and, on the other hand, led to the duplicate clichés

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to poor printing results.

In order to be able to be used in the production of duplicate clichés based on polyester, the Maternmaterial not only of such a nature that it is among those used in the manufacture of the material from the original printing block or the Original plate applied! Temperature and pressure conditions can be pressed without difficulty, but it must also be a ) have sufficiently high heat resistance so as not to be deformed during the production of the duplicate cliché »It must be furthermore characterized by an easy detachability, so that the duplicate clichés made of a polyester resin can be copied their shaping without sticking or sticking firmly and preferably without the need to use release agents from which materia can be detached.

It is therefore the object of the invention to create a mat material which, on the one hand, has a minimum of shrinkage and changes in shape can be formed, is uniform both at its lower-lying and at its raised points and finally has a composition soft enough to avoid damaging or deteriorating the original printing block, and on the other hand polyester resins and other base materials suitable for making printing plates assumes, forms and releases in such a way that practically undeformed duplicate clichés of high reproduction accuracy can be produced. This object is achieved by the invention.

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Tjer invention was based on the knowledge that the asked Task can be solved with a matern material, in which a fibrous base covered with a plastic film a resin layer is bonded.

The subject matter of the invention is thus a mat material consisting of

a) a sheet-shaped base with a thermosetting Resin impregnated fiber material,

b) one applied to a rope of the sheet-like base Layer of a thermosetting resin and

c) one on the coated side of the impregnated Fibers formed sheet-like base by means of a

• ■ ■ ■

Adhesive attached, sheet-like cover layer made of an olefin polymer.

The invention is described below with reference to the drawings illustrated, preferred embodiment of a Maternmaterials according to the invention explained in more detail. That in the Drawing shown in side view mat material according to the invention shows a layer structure. The ratio of However, the thickness of the individual layers is shown arbitrarily. The material shown in the drawing is it is a board-like or panel-like laminate made of a sheet-like, made of ceilulosic material impregnated with a phenolic resin existing base 1, which is coated with a layer 2 of a phenolic resin, which in turn with a Adhesive layer 3 is coated on which a polypropylene:

0 0 9887/1552

slide 4 is attached.

The base used in the manufacture of the matern material of the invention consists of a type of sheet or sheet of fiber material and can be made of cellulose fiber or other natural or synthetic fibers, for example cotton, hemp, wool, rayon, polyamide or polyester fibers be. As a rule, the base is preferably made of cellulose material which contains both short and long fibers originating from a fiber pulp. The base is impregnated with a thermosetting resin, for example a phenol-formaldehyde resin, a urea-formaldehyde resin, a melamine-formaldehyde resin, an aniline-formaldehyde resin or an alkyd resin. In most cases, the base is preferably impregnated with a phenol-formaldehyde type resin. In place of some of the thermosetting resin, natural resins, such as rosin and copal, and novolaks can optionally be used. The substrate is expediently about 35 to 65 %, preferably 45 to 55%, saturated with the thermosetting resin. The thickness of the impregnated base is expediently 1.27 to 7 »62 mm and preferably 1.78 to 2.54 mm.

The impregnated pad is covered with a thermosetting resin coated. This can be made from the same resin as it was used to impregnate the base, or from another thermosetting resin Resin consist. It is preferably the resin used to coat the impregnated substrate

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around an all-purpose, two-stage, with minerals and wood flour filled low-pressure phenol-formaldehyde molding resin with short Curing time and long flow. The thickness of the resin layer can be 0.05 to 1.02 mm. It is preferably between 0.13 and 0, i? 1 mm

On the coated side of the impregnated base is a prefabricated film made of an olefin polymer attached. The olefin polymer must be in the form of a preformed film and not by spraying the top of the coated substrate can be applied with a solution of the olefin polymer, since in a spray-on operation no satisfactorily deformation-free Maternmaterial can be obtained. As already mentioned, in the manufacture of matern materials in accordance with of the invention is made from a thermoplastic olefin polymer existing film or a also a thermoplastic olefin polymer existing film on a coated with a thermosetting resin base, which in turn with a thermosetting Resin is soaked, to be attached. Those on the coated, - consisting of impregnated fiber material The film to be attached to the base can be made of a polymer consisting of Ot-olefin units with 2 to 3 carbon atoms, for example made of polyethylene, polypropylene or polybutylene, exist. Suitable olefin polymers have flow rates of 12 to 24, measured according to the ASTM test standard D - 1238 - 65 T. The preferred olefin polymer is a Polypropylene with a flow rate of about 16. To ensure a good bond, one side of the film

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primed before joining with the adhesive or after known methods flamed, exposed to a treatment with electrical discharges or with ozone or another oxidizing agent treated. This treatment significantly improves the bond strength of adhesives.

In the case of the one used to connect the film to the coated base made of impregnated fiber material

k Adhesive is usually a solution of a organic polymers and fillers in an organic solvent. The preferred adhesives are the thermoplastic Polymers such as polyvinyl acetate, polyvinyl formal, polyvinyl butyral, polyvinyl alcohol, polyvinyl alkyl ethers, polystyrene, Styrene-butadiene copolymers, homopolymers and copolymers of acrylic or methacrylic acid, polymers of lower Alkyl acrylates or methacrylates, alkyl 2-cyanoacrylates, Acrylonitrile, methacrylamide, methacrylonitrile or acrylamide. The thickness of the adhesive solution applied to the film

The same layer is usually between 0.0127 and 0.0254 mm.

The examples illustrate the invention. Example 1 ,

A mat material was made as follows:

1. On a primed side of a 0.076 mm thick polypropylene sheet a thin layer of adhesive was applied.

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The polypropylene film had the following properties: tensile strength in kg / cm ² · LR ⁺ 464

Ln% Running direction QR ⁺⁺ 415 850 g / mm (40 g / mil) Strain : Transverse direction LR 900 g / mm (90 g / mil) in kg / cm QR 84J6 Tensile module LR 8436 Tensile strength QR 1575 LR 3543 + LR ■ - QR ++ QR - ■

In the case of the adhesive applied to the polypropylene film it was an acrylonitrile-butadiene mixed polymer in methyl isobutyl ketone. This adhesive had the following properties:

Viscosity measured in one

Brookfield viscometer

Model LVF at 30 rpm

Spindle No. 2 to 22.2 ⁰ O 180 - 250 cps

Solids content 20-24%

Specific weight 0.89-0.91

The adhesive was applied in a deep ■ Coating device equipped with a printing cylinder. To the Layered sticks were used to smooth the adhesive layer. With

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, Adhesive coated polypropylene film was used for removal of the solvent from the adhesive passed through a 2-zone drying chamber and then on a Quench roll cooled down.

2. A sheet made from a cellulosic pulp with short and long fibers was applied with a general purpose, two-stage, phenol mold filled with mineral and wood flour

* soaked in aldehyde resin. About 50 % of the cellulose sheet was soaked with the resin, ie the degree of saturation of the cellulose sheet on the resin was about 50%. The sheet soaked with the phenolic resin was then coated with a 20 percent solution of the same phenol-formaldehyde resin in ethanol. An automatic spray device was used to apply a uniform, 0.254 to 0 ^ 305 mm thick layer of phenolic resin to the impregnated cellulose substrate. The coated base was in

H . was adjusted clamped a frame, whereupon the latter 45 minutes to remove the ethanol in an oven, in rich air at a temperature of 88 ^Q C was circulated. Thereafter, the frame was for 2 minutes at a 146 ⁰ G hot heating plate down and partially cured phenolic resin, that is transformed into the ¹¹ B "state.

3. The adhesive coated polypropylene sheet was on placed the coated side of the impregnated cellulose substrate and for the production of a matern material according to Invention heated. This layer-like structure continued

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composed of the following successive layers:

a) felt pad

b) sponge rubber cloth

c) felt pad

d) made of polyamide "stretchable modeling cloth"

e) polypropylene film

f) adhesive layer adhering to the polypropylene film

g) on the impregnated cellulose Phenolic resin layer on the base

h) impregnated, cellulose base i) release paper
J) sheet steel

This layer-like structure was under for 2 minutes

1 »^ kg / cm ²

a pressure of a weight of about / preheated to a temperature of ⁰ C 14-6. Such a pressure was then exerted on the layer-like structure in a cold press that the layers were bonded together. After cooling, the laminate was removed from the assembly.

The matern material obtained had a thickness of about 2.16 mm with a covering thickness of 0.889 mm. The received Maternaterial showed no shrinkage when pressed. Furthermore, its covering was more even than the previously known maters.

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Example 2

Usability of the matern material in the manufacture of Duplicate clichés based on polyester.

An original printing block without a cover to facilitate removal was combined with a mat material produced according to Example 1. The pressure floor and the Mater material were placed in a hydraulic press and heated, however, 1 minute without pressure at closed pressure plates 14-3 ⁰ C. Then the printing block and the matern

material exposed to a pressure of 14.0 to 35 »0 kg / cm for 9 minutes. The printing block and the material were then removed from the press. After cooling down, the mater was dated Original printing block separated.

Thereafter, the mater was placed on the lower platen of a hydraulic two-plate press, in which both plates were maintained at a temperature of 82 ⁰ C. A sealant dam was built around the mater. Furthermore, a fitting ring of sufficient thickness was arranged around the material in order that a polyester plate of the desired thickness could be obtained. In the area delimited by the dam, an unsaturated film resin containing curing catalyst was then poured into it. Thereafter, the upper printing plate was placed on the dam in circulation and less than 15 "':riu1' n long at a temperature of 82 ⁰ C in yet held Kontatt with the blank printing plate was cooled and?.

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then separated from the Mater. The obtained polyester printing plate had, in terms of its reproduction accuracy, The fineness of their screen dots and their printability have excellent printing properties.

Claims: Q09887 / 1S52

Claims (1)

Claims che Matern material for the production of duplicate clichés, consisting of a) a sheet-shaped base made of fiber material impregnated with a thermosetting resin, b) a layer of a thermosetting resin applied to one side of the sheet-like base and c) one on the coated side of the sheet-like base formed from impregnated fibers by means of a Adhesive attached, sheet-like cover layer made of an olefin polymer. 2. Hatern material according to claim 1, characterized in that the fiber material of the sheet-like base consists of cellulose fibers . 3 · Mater material according to, one or both of the preceding claims, dadiixch in that the fiber material of the sheet-shaped support is impregnated with a phenol-formaldehyde resin. A-. Htt * HaaÄtel? Tal according to one or more of the preceding approaches, characterized in that the beatebitde sheet-like base made of impregnated fibers is coated with a phenolic hydharp . 009887/1552 BAD ORfQINAL 5. Maternmaterial according to one or more of the preceding Claims, characterized in that the sheet-like cover layer consists of a polypropylene film ^ 6. A method for producing a matern material according to one or more of the preceding claims, characterized in that that he a) impregnating a fiber material in sheet form with a thermosetting resin, b) one side of the impregnated sheet-like fiber material coated with a thermosetting resin, , c) on one side of a film made of an olefin polymer applies an adhesive, d) the coated with the thermosetting resin side of the impregnated, sheet-shaped fiber material with that with the Brings the adhesive-coated side of the film into contact, and finally e) the sheet-like composite body obtained under pressure laminated. 7. The method according to claim 6, characterized in that in step a) the fiber material in sheet form with a pnenol-formaldehyde resin soaks. - 8. The method according to one or both of the preceding claims, characterized in that in step b) the impregnated, sheet-like fiber material ax a phenol-formialdehyde resin coated. 009887/1552 Dr. PEOPLE * vos -us DR JORGLN SC.; ... JEv / AHN ρöo ^ m ^ ^J ^ i -ι- T ^ - Tenneco Chemicals, Inc. 203 ^ 989 ifjvi. 9 ancestors according to one or more of claims 6 to 8, characterized in that one in process stage c) a Polypropylene film used. 10. The method according to one or more of the preceding claims, characterized in that one side of the film is coated with a primer before the adhesive is applied provides or subjected to an activating treatment to improve the bond strength of adhesives. 009 8 8 7/1552