CN101537745A - Process for producing PET laser transfer membrane - Google Patents
Process for producing PET laser transfer membrane Download PDFInfo
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- CN101537745A CN101537745A CN200910050145A CN200910050145A CN101537745A CN 101537745 A CN101537745 A CN 101537745A CN 200910050145 A CN200910050145 A CN 200910050145A CN 200910050145 A CN200910050145 A CN 200910050145A CN 101537745 A CN101537745 A CN 101537745A
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Abstract
The invention relates to a process for producing a PET laser transfer membrane. A PET membrane is used as a basement transfer membrane, and laser transfer pigment is coated and spread on the PET membrane. The method includes the following steps: a laser transfer pigment is coated and spread on the PET basement transfer membrane by an anilox roll at one step to form a coating layer, and a precoating membrane can be formed after the operation of drying is carried out; the precoating membrane is processed by the operation of laser mould pressing, and interference figures on a laser slab are printed on the coating layer of the precoating membrane by heat pressing so as to form a mould pressing membrane; and aluminum is coated on the mould pressing membrane, an aluminum layer is formed on an information layer, and the PET laser transfer membrane can be prepared, wherein the pigment includes thermoplastic acroid resin and cellulose acetate. The process has the advantages that the special singly coated laser transfer pigment and the unique manufacture process control are selected, and the entire process is simple, novel, stable and reliable. As the laser mould pressing transfer coating layer has the properties of easy mould pressing, favorable stripping, and the like, the operation of coating just needs to be carried out for one time, and therefore the production efficiency can be greatly improved. After being transferred and stripped, the aluminum coated membrane can be recycled to be repeatedly used for many times, and therefore cost can be greatly reduced; and the PET laser transfer membrane is the environmentally friendly anti-counterfeit laser material for packaging and printing.
Description
Technical field
The present invention relates to technical field of packaging and printing, specifically a kind of packages printing manufacturing process of PET laser transfer membrane.
Background technology
General packages printing is mainly the PET laser transfer membrane of radium-shine composite membrane of BOPP or secondary coating etc. with radium-shine film.Because of the manufacturing process of the radium-shine composite membrane of BOPP, exist basement membrane yielding, the side cut loss is big, and mold pressing speed is slow, and production efficiency is low, and basement membrane can't reclaim behind the composite print, problems such as not enough environmental protection; The manufacturing process of the PET laser transfer membrane of secondary coating needs twice coating, promptly is coated with one deck release layer earlier, is coated with one deck Information Level again, just can reach the function of peeling off and be molded into picture, so also exist production efficiency low, and problem such as basement membrane is yielding.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of manufacturing process of PET laser transfer membrane, adopt the mode that once is coated with laser transfer coatings, technology is easy, efficient is high, and made holographic false proof product---PET laser transfer membrane has high environmental protection, high-quality characteristics.
The present invention solves the problems of the technologies described above the technical scheme of being taked: a kind of manufacturing process of PET laser transfer membrane is a transfer basement membrane with the PET film, is coated with laser transfer coatings on it, after mold pressing, aluminize and make, comprises the steps:
The first step: once be coated with laser transfer coatings with anilox roll and form coating on the PET transfer basement membrane, pre-coating film (wherein, preferred 8～42 dyne of surperficial dyne value of the PET transfer basement membrane of coating usefulness, the dyne value is high more, and to peel off effect poor more) is made in oven dry;
Second step: pre-coating film is carried out laser molding, the interference fringe hot pressing on the radium-shine laser version is printed on the coating of pre-coating film and form Information Level, make moulding film;
The 3rd step: moulding film is aluminized, on Information Level, form aluminium lamination,, improve laser brightness, make the PET laser transfer membrane to increase the reflecting effect of mold pressing Information Level.
Wherein, wherein, describedly once be coated with the mixture that transfer coatings is thermoplastic acrylic resin and cellulose acetate, mixing quality is than thermoplastic propene acid resin: cellulose acetate=7.5～8.5: 2.5～1.5, and it has function moldable and that easily peel off simultaneously.
Thermoplastic acrylic resin is specifically as follows 7.5: 2.5 with the mixing quality ratio of cellulose acetate, and 7.8: 2.2,8: 2,8.2: 1.8 or 8.5: 1.5.
Laser transfer coatings of the present invention except that select for use have moldable, easily peel off the function of function, it is good also to have had pliability, anti-solvent, temperature tolerance are good, printing adaptability is good, characteristics such as suitable production in enormous quantities.
On the basis of such scheme, in the whole art production process, environmental requirement to coating, mold pressing is tighter, need carry out indoor air purification and keep certain temperature, humidity, the fabrication process condition of concrete PET laser transfer membrane is: the indoor air purification grade is 8～100,000 grades, temperature is 20～25 ℃, and humidity is 40～60%.
In the process of making the PET laser transfer membrane, check, packing to moulding film and aluminizer are finished by a minute cutting process, cut the check and the rewinding packing work that mainly perform moulding film and aluminizer, according to test stone to the laser brightness of transfer membrane, spot, version apart from, peel off effect, pliability etc. and test.
On the basis of such scheme, described laser transfer coatings is by the low sticking low suitable last machine viscosity that is formulated to admittedly, and it is 7～9S that coating viscosity is surveyed with 4# Cai grace cup, adopts big coating weight, reaches best coating levelling effect.
On the basis of such scheme, in the coating process of the first step, in coating, add diluent several times, control dry-coated amount and be: the offset printing product is 1.0～1.2g/m
2, the gravure product is 1.2～1.4g/m
2
What of dry-coated amount mainly are to control by the viscosity of control coating, when adding diluent accent viscosity, accomplish to add less, spare no effort to, to guarantee the uniformity of dope viscosity in the whole process of production as far as possible, it is constant to be that the solid content of coating remains, and coating uniformity is good.The gain in weight of the available whole volume basement membrane of the calculating of the dry-coated amount of coated film calculates divided by area.
On the basis of such scheme, described diluent is mainly the mixed solvent of ketone and ester class, is specifically as follows the mixed solvent of butanone and n-propyl, and wherein, the mass ratio of butanone and n-propyl is 3.5～4.5: 1, is preferably 4: 1.
Butanone is fast dried solvent, and it is very fast to fall dope viscosity, be convenient to coating, and n-propyl is the slow curing solvent, can adjust the rate of volatilization of solvent, improves levelability, prevents too fast doing and makes coating produce whiting.
According to the levelling and the oven dry situation of coating, select suitable coating speed and oven temperature for use, be specially:
In the coating process of the first step, described anilox roll is 35～60 line/inches for the line number, the anilox roll in rhombus band thorough cut groove cave, and the coating speed of anilox roll is 80～130m/min.
The too low inconvenience coating of speed levelling, the too high bad and few problem of coating weight of levelling that also can occur.
In the drying course of the first step, first section temperature of oven is 85～100 ℃, and several sections temperature of oven in back are 100～140 ℃.
Oven temperature that general two previous section temperature is set is low so that solvent volatilizees in a large number, because if front-end temperature is too high, the coating surface drying is too fast, forms sealing, the solvent gas of the inside just is not easy to evaporate; And the back need have a joint to be made as maximum temperature, and this temperature need be higher than the boiling point of all solvents in the coating, so that solvent is fully volatilized.
Oven temperature is low or exhaust air rate is not enough, and coating is not dried, and then mold pressing may produce edition variable color or sticking version problem, and the VOCs of aluminizer product may not reach requirement, and heat-resistant and solvent-resistant can reduce; And oven temperature is when too high, can occur crisp partially after the coated and dried or splits the coating phenomenon, and molding temperature also higher phenomenon can occur.
On the basis of such scheme, in the mold process in second step,, adjust to best molding temperature and pressure according to laser brightness, molding temperature is 150～180 ℃, molding pressure is 20～30kg/cm
2, mold pressing speed is 45～65m/min, and adjusts each section tension force according to version apart from situation, controls an edition distance well.
The groove of vegetarian noodles version surface fringe is more shallow, is difficult for mold pressing, and mold pressing speed is slow slightly; The groove of light beam version and flower version surface fringe is darker, easily mold pressing, and mold pressing speed can be fast slightly.
On the basis of such scheme, in the mold process in second step, the radium-shine laser version that makes to be turned in electroforming be attached on the moulding press version roller, described radium-shine laser version is a laser nickel plate, its thickness is 40～50 μ m.
On the basis of such scheme, to aluminize need to adjust and control the thickness of coating and the uniformity well, also available home roll temperature is suitably adjusted an edition distance.In the process of aluminizing in the 3rd step, the home roll temperature is 3 ℃～20 ℃.Version is not apart from shrinking substantially in the time of 3 ℃ for the home roll temperature, and the version distance has contraction in various degree during greater than 3 ℃, and the high more version of temperature is big more apart from shrinking between 3 ℃～20 ℃.
Indoor temperature is too low can to influence dope viscosity, oven temperature and forging printing plate roller temperature, is unfavorable for coating and mold pressing.The too high then paint solvent volatilization of temperature is very fast, and operating environment is poor, has unsafe factor.Easily produce static in the too low then production process of indoor humidity on the basement membrane, the absorption dust, thus influence product quality.Humidity is too high can be absorbed moisture on the coating when then being coated with and produce blushing, and the brightness of mold pressing laser obviously weakens.
The invention has the beneficial effects as follows:
The present invention compares with prior art, and key is to select for use in special-purpose once coating laser transfer coatings and the unique manufacturing process control, and whole technology is succinct, novel, stable, reliable.Have easy mold pressing and function such as peel off because laser molding is transfer coated, therefore need once be coated with, can enhance productivity greatly.Basement membrane was also recyclable after aluminizer shifted and peels off uses repeatedly repeatedly, can reduce cost greatly, and be a kind of environmental protection type packing print laser anti-fake material.Be applicable to the manufacturing processing of the laser anti-counterfeiting package printing material of tobacco bale, Jiu Bao, cartridge bag etc.
Description of drawings
Fig. 1 is a process chart of the present invention.
Fig. 2 is the structural representation of laser transfer membrane of the present invention.
The specific embodiment
Seeing also Fig. 1 is that process chart of the present invention and Fig. 2 are shown in the structural representation of laser transfer membrane of the present invention, a kind of manufacturing process of PET laser transfer membrane, with the PET film is transfer basement membrane, be coated with laser transfer coatings on it, several operations such as mainly comprise coating, mold pressing, aluminize, cut comprise the steps:
The first step: upward once be coated with laser transfer coatings at PET transfer basement membrane (surperficial dyne value is at 38～42 dyne) and form coating with anilox roll, it is 7～9S that the coating viscosity of described laser transfer coatings is surveyed with 4# Cai grace cup, in coating, add diluent several times, diluent is a butanone: n-propyl (mass ratio) is 4: 1 a mixed solvent, and dry-coated amount is: the offset printing product is 1.0～1.2g/m
2, the gravure product is 1.2～1.4g/m
2, anilox roll is 35～60 line/inches for the line number, the anilox roll in rhombus band thorough cut groove cave, and the coating speed of anilox roll is 80～130m/min; Oven dry, first section temperature of oven is 85～100 ℃, several sections temperature of oven in back are 100～140 ℃, make pre-coating film;
Second step: pre-coating film is carried out laser molding, to turn over the laser nickel version (the about 45 μ m of thickness) that makes with 467 type 3M double faced adhesive tapes of the U.S. is attached on the moulding press version roller, after washing version with alcohol or ethylene glycol monobutyl ether, the intensification mold pressing, interference fringe hot pressing on the radium-shine laser version is printed on the coating of pre-coating film and form Information Level, molding temperature is 150～180 ℃, and molding pressure is 20～30kg/cm
2, mold pressing speed is 45～65m/min, makes moulding film;
The 3rd step: moulding film is aluminized (the home roll temperature is 3 ℃～20 ℃), on Information Level, form aluminium lamination, make the PET laser transfer membrane;
Wherein, described coating is formulated by a certain percentage with thermoplastic acrylic resin+cellulose acetate, and it has function moldable and that easily peel off simultaneously.The thermoplastic acrylic resin NeoCryl B-801 type of DSM NeoResins company, the cellulose acetate CAP-482-0.5 type of EASTMAN company.Resin is pressed NeoCryl B-801: CAP-482-0.5=8 during preparation coating: 2 proportioning.Mixed solvent is 4: 1 with the mass ratio of butanone and n-propyl.The resin for preparing is in proportion mixed the back high-speed stirred with mixed solvent, the coating that is mixed with 20% solid content is standby.(the similar resin of other performance also can be selected for use after test, but can performance difference to some extent be used on different product and decide)
The check of moulding film and aluminizer, packing are finished by a minute cutting process.Coating, mold pressing, aluminize, the operation of cutting apparatus is very clearly to those skilled in the art.
The fabrication process condition of PET laser transfer membrane is: the indoor air purification grade is nearly 100,000 grades, and temperature is 20～25 ℃, and humidity is 40～60%.
Claims (10)
1, a kind of manufacturing process of PET laser transfer membrane is a transfer basement membrane with the PET film, is coated with laser transfer coatings on it, after mold pressing, aluminize and make, it is characterized in that comprising the steps:
The first step: once be coated with laser transfer coatings with anilox roll and form coating on the PET transfer basement membrane, pre-coating film is made in oven dry;
Second step: pre-coating film is carried out laser molding, the interference fringe hot pressing on the radium-shine laser version is printed on the coating of pre-coating film and form Information Level, make moulding film;
The 3rd step: moulding film is aluminized, on Information Level, form aluminium lamination, make the PET laser transfer membrane.
Wherein, describedly once be coated with the mixture that transfer coatings is thermoplastic acrylic resin and cellulose acetate, mixing quality is than thermoplastic propene acid resin: cellulose acetate=7.5～8.5: 2.5～1.5.
2, the manufacturing process of PET laser transfer membrane according to claim 1 is characterized in that: the fabrication process condition of PET laser transfer membrane is: the indoor air purification grade is 8～100,000 grades, and temperature is 20～25 ℃, and humidity is 40～60%.
3, the manufacturing process of PET laser transfer membrane according to claim 1 and 2 is characterized in that: in the coating process of the first step, add diluent several times in laser transfer coatings, it is 7～9S that control coating viscosity is surveyed with 4# Cai grace cup.
4, the manufacturing process of PET laser transfer membrane according to claim 3 is characterized in that: controlling dry-coated amount by control coating viscosity is: the offset printing product is 1.0～1.2g/m
2, the gravure product is 1.2～1.4g/m
2
5, the manufacturing process of PET laser transfer membrane according to claim 3 is characterized in that: described diluent is the mixed solvent of butanone and n-propyl, and wherein, the mass ratio of butanone and n-propyl is 3.5～4.5: 1.
6, the manufacturing process of PET laser transfer membrane according to claim 1, it is characterized in that: in the coating process of the first step, described anilox roll is 35～60 line/inches for the line number, the anilox roll in rhombus band thorough cut groove cave, and the coating speed of anilox roll is 80～130m/min.
7, the manufacturing process of PET laser transfer membrane according to claim 1 is characterized in that: in the drying course of the first step, first section temperature of oven is 85～100 ℃, and several sections temperature of oven in back are 100～140 ℃.
8, the manufacturing process of PET laser transfer membrane according to claim 1 is characterized in that: in the mold process in second step, molding temperature is 150～180 ℃, and molding pressure is 20～30kg/cm
2, mold pressing speed is 45～65m/min.
9, the manufacturing process of PET laser transfer membrane according to claim 1 is characterized in that: in the mold process in second step, described radium-shine laser version is a laser nickel plate, and its thickness is 40～50 μ m.
10, the manufacturing process of PET laser transfer membrane according to claim 1 is characterized in that: in the process of aluminizing in the 3rd step, the home roll temperature is 3 ℃～20 ℃.
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