Paper-based material for direct manufacturing of offset printing forms by means of laser printer

FIELD: printing industry.

SUBSTANCE: invention relates to printing consumable form materials and may be used to produce offset printing forms. Material represents a base paper, onto which at one side a hydrophilic layer (receiving layer) is applied, which receives laser printer toner well, at the other side - a hydrophobic layer (counterlayer). Counterlayer includes a hydrophobic film-forming polymer, in particular copolymer of vinyl acetate and vinyl chloride or its modified derivatives, or butyral resin, or cellulose acetobutyrate, or copolymer of butyl methacrylate, methyl methacrylate and methacrylic acid and trichloracetic acid.

EFFECT: invention makes it possible to minimise shrinkage of linear dimensions of printing form, which takes place in process of toner heat fixing in process of printing at laser printer and to increase mechanical strength of paper form in moist condition.

2 tbl, 10 ex

 

The invention relates to a consumable printing materials, in particular material on a flexible basis used for doprocessing get offset printing plates by printing on a laser printer.

The invention relates to contray obtained by applying the solution on the paper-based and their subsequent drying.

Known material on a flexible polyethylene terephthalate (PET) base, used for direct production of offset printing plates using a laser printer [1]. He was selected as a prototype. Manufactured from it printed forms show a significant decrease in linear dimensions (shrinkage) when printing on a laser printer that does not allow them to be used in full color printing.

The aim of the invention is the elimination of the shrinkage printed form when you print on a laser printer and increase the mechanical strength of paper printed form in the wet state. This goal is achieved using as the basis for cartographic base paper, which is applied to controI consisting of a hydrophobic film-forming polymer, in particular a copolymer of vinyl acetate with vinyl chloride (WAWH) or its modified derivatives or polyvinyl butyral (PVB), or acetobutyrate cellulose (ABC), or a copolymer of butyl methacrylate, methyl methacrylate and metacril the Oh of the acid (BMC-5) and trichloroacetic acid (THU) in the following ratio of components, wt.%: hydrophobic film-forming polymer - 33,33-83,33 THU 16,67-66,67.

A comparison of the proposed technical solutions to the prototype allowed us to establish compliance with a criterion of "novelty". The study of other known technical solutions in this area [2] the features distinguishing the claimed invention from the prototype, were not identified and thus provide the claimed technical solution according to the criterion of "significant differences".

Examples of specific performance.

Example 1 (prototype).

PET the basis of a thickness of 100 μm is applied the adhesive composition layer (sublayer) of the following composition, wt.%:

polyvinylpyrrolidone - 1,73

WASH - 4,03

THU - 5,76

acetone - 68,30

the ethyl cellosolve - 20,18.

After drying the obtained adhesive sublayer is applied composition receiving layer of the following composition, wt.%:

polyvinyl alcohol - 2,83

iron oxide pigment - 2,48

kaolin - 7,44

glutaric aldehyde - 0,23

water - 87,02.

The thickness of the receiving layer after drying the applied composition for 30 minutes at 100-110°C is 4-6 μm. Receiving the printing plate A4 spend on a laser printer Laser Jet. Measure the linear dimensions of the shape (longitudinal and transverse) before and after printing, hold a metal ruler with a multiplier of 1 mm Shrinkage linear dimensions are calculated according to the following formula

Shrinkage,%=[(lKon-lRef)/lRef]×100,

where lRef- longitudinal (transverse) size form to adventures through a laser printer, lKon- longitudinal (transverse) size shape after passing through the laser printer. The results of determination of the shrinkage of the form shown in table 1.

Example 2 (comparative).

On cartographic base paper weighing 120 g/m2(paper-based) cause the receiving layer of example 1. Receiving the printing form and the determination of its shrinkage spend the same way as in example 1. Measurement of mechanical strength (explosive force) wet printing plates in the longitudinal and transverse directions is performed on a tensile testing machine RMB 30 by the method according to GOST ISO 1924-1-96. Wet forms reach by keeping it in water at 20-25°C for one hour. The results of the disruptive force are shown in table 2.

Example 3.

On the base paper cause the receiving layer of example 1. On the reverse side of the applied composition contraa the following composition, wt.%:

WASH - 10,79

THU - 10,79

acetone - 61,34

butyl acetate - 17,08.

The applied composition is dried at 50°C, after drying controI has the following composition, wt.%:

WASH - 50,00

THU - 50,00.

Weight contraa is 15 g/m2. Obtain printing plates and measuring the shrinkage and mechanical firmly the ti spend the same way as in example 2.

Example 4.

On the base paper cause the receiving layer of example 1. On the reverse side of the applied composition contraa the following composition, wt.%:

WASH - 11,80

THU - 2,36

acetone - 67,14

butyl acetate - 18,70.

After drying controI has the following composition, wt.%:

WASH - 83,33

THU - 16,67.

Obtain printing plates and measuring the shrinkage and mechanical strength carried out as in example 2.

Example 5.

On the base paper cause the receiving layer of example 1. On the reverse side of the applied composition contraa the following composition, wt.%:

WASH - 9,74

THU - 19,48

acetone - 55,37

butyl acetate - 15,41.

After drying controI has the following composition, wt.%:

WASH - 33,33

THU - 66,67.

Obtain printing plates and measuring the shrinkage and mechanical strength carried out as in example 2.

Example 6.

On the base paper cause the receiving layer of example 1. On the reverse side of the applied composition contraa the following composition, wt.%:

carboxyl-modified WASH - 10,79

THU - 10,79.

acetone - 61,34

butyl acetate - 17,08

After drying controI has the following composition, wt.%:

carboxyl-modified WASH - 50

THU - 50.

Obtain printing plates and measuring the shrinkage and mechanical strength carried out as in example 2.

Example 7.

The paper is again put the receiving layer of example 1. On the reverse side of the applied composition contraa the following composition, wt.%:

hydroxyl-modified WASH - 10,79

THU - 10,79

acetone - 61,34

butyl acetate - 17,08.

After drying controI has the following composition, wt.%:

hydroxyl-modified WASH - 50

THU - 50.

Obtain printing plates and measuring the shrinkage and mechanical strength carried out as in example 2.

Example 8.

On the base paper cause the receiving layer of example 1. On the reverse side of the applied composition contraa the following composition, wt.%:

ABC - 10,79

THU - 10,79

acetone - 61,34

the ethyl cellosolve - 17,08.

After drying controI has the following composition, wt.%:

ABC - 50

THU - 50.

Obtain printing plates and measuring the shrinkage and mechanical strength carried out as in example 2.

Example 9.

On the base paper cause the receiving layer of example 1. On the reverse side of the applied composition contraa the following composition, wt.%:

PVB - 10,79

THU - 10,79

acetone - 61,34

the ethyl cellosolve - 17,08.

After drying controI has the following composition, wt.%:

PVB - 50

THU - 50

Obtain printing plates and measuring the shrinkage and mechanical strength carried out as in example 2.

Example 10.

On the base paper cause the receiving layer of example 1. On the reverse side put the song counter the Loya following composition, wt.%:

BMC-5 - 10,79

THU - 10,79

acetone - 61,34

butyl acetate - 17,08.

After drying controI has the following composition, wt.%:

BMC-5 - 50

THU - 50.

Obtain printing plates and measuring the shrinkage and mechanical strength carried out as in example 2.

Table 1
Reduction (shrinkage) of the linear dimensions of the sample printed forms after printing them to the test object laser printer
No. of sample (example)12345678910
Shrinkage, %Longitudinal0,340,10000000,0300
Cross0,24 0,2400000000

Table 2
Mechanical strength (breaking strength) of wet samples of printed forms
No. of sample (example)12345678910
Breaking strength, kgf/cmLongitudinal-1,23,37,02,33,53,12,82,73,0
Cross- 0,51,63,61,11,71,51,51,31,5

As can be seen from table 1, replacement PET Foundation at the base paper significantly reduces the shrinkage of the printing form after printing it to the test object laser printer (examples 1, 2). The almost complete elimination of shrinkage is achieved by introducing into the composition of the plate material contraa consisting of a hydrophobic film-forming polymer and trichloroacetic acid (example 3-10). The introduction of contraa, as follows from comparison of the data of example 2 with the data of examples 3-10 table 2, also allows to substantially increase the mechanical strength of the paper printed form in the wet state. Particularly this effect with the minimum content of THU (example 4) and use in contrae copolymer of vinyl acetate and vinyl chloride or its modified derivatives (examples 3, 6, 7). High strength paper form in the wet state is one of the necessary factors for the high length of the printing form.

Sources of information

1. Patent of the Russian Federation (prototype)application number 2008100408, IPC6G11 5/62, 2008.

2. THE 13-01-533-82. Paper hydrofilm the I for the manufacture of forming plates for offset printing with increased length. 1982.

The material for the direct production of offset printing plates using a laser printer, comprising a flexible substrate and a hydrophilic receiving layer, characterized in that, as a flexible framework use cartographic base paper with kontrolom comprising a hydrophobic film-forming polymer, in particular a copolymer of vinyl acetate with vinyl chloride or its modified derivative, or polyvinyl butyral, or acetobutyrate cellulose, or a copolymer of butyl methacrylate, methyl methacrylate and methacrylic acid and trichloroacetic acid in the following ratio, wt.%:

hydrophobic film-forming polymer33,33÷83,33
trichloroacetic acid16,67÷66,67



 

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