DE1471678B2 - Method and device for printing or decorating surfaces of hard objects with a thick application of paint - Google Patents

Description

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The invention relates to a method and a pre-color printing of high color thickness and with high

Direction for printing or decorating top speed to apply. There is the

surfaces of hard objects with a thick color option, parts or letters of the imprint

order, with od on a support surface. Like. Filmbil- to change after each transfer, for example

the color masses to be created according to the S the objects to be printed with a continuous

Imprint are applied and the liquid film is provided with consecutive numbering,

is then treated so that its cohesion The drawing shows an embodiment of a

effect as well as the adhesion effect between printing device according to the invention,

the film and the surface of the object it represents

becomes stronger than the adhesive effect between film ίο F i g. 1 is a side view and

and carrier, so that the entire film without rear

stood from the carrier surface to the carrier surface to be printed with a film application.

Surface can be transferred. The in F i g. 1 shows a device

For printing and decorating hard opposing drum 10 on a shaft 12. The drum is available in various printing processes, e.g. 15 counterclockwise with the desired rotary letterpress or gravure, flat printing such as offset printing, number by means of a chain 14 and a sprocket 16 or screen printing, known. This conventional driven by a drive, not shown.
However, printing processes are not suitable, hard objects are on the circumference of the drum, such as B. bottles, with a thick, support surface 18 made of a material with the following multicolored imprint at high working speed 20 properties: Imprint can easily be changed after each order, e.g. B. film is as non-adhesive as possible, the work the objects to be printed continuously but must be wettable to fabric; (b) number the material. In a printing process for plastic, the printing pattern 25 prescribes the selected color must remain operational over a wide temperature range, such as fabric foils, on a support surface, such as calender roll, casting and (c), the material should preferably by elasto drum or casting belt, and then be of merer nature.

here on the art applied to this carrier. In the preferred embodiment, can

to transfer fabric foil. The order (but does not have to be) the support surface 18 takes place from one of the

of the print sample in a plastic solution made with 30 of the following materials that have these properties

the film is fusible. Have the applied liquid with regard to the color composition, loading

Printing pattern, a film layer, will then consist of: chloroprene; Polyvinyl chloride; Carboxymethyl

is that it becomes harder and the contours are cellulose; Polytetrafluoroethylene; Dimethylsiloxane;

can no longer change. This can e.g. B. by polyethylene propylene; Polyester; Polyurethane (iso-

Heating done. This is followed by the fusion (cyanate polymer); Polyamides; Polysobutylene; Buta-

of the print pattern with the diene-acrylonitrile mixed copolymer and polyvinyl alcohol to be applied

the plastic film. This procedure is for retrieval.

printing of plastic films is suitable because this is next to the support surface 18 is located within

the hardened print pattern with the only in the emergence of the drum a thermostatically controlled electrical

understood film can enter into a merger. 40 heating element 20, the temperature of the support surface

For printing on hard objects, this 18 is set to a desired value within the loading

However, the method is not useful. rich between room temperature and about

The object of the invention is therefore to remedy the deficiencies mentioned above during the rotation of the drum 10 and to provide a method and hold. In addition to the drum 10, there is a device to be able to provide even hard parts 45 three separate and independent color items at high working speed with parts 22, 24, 26 with a paint container 30, 32 or a thick paint application. 34 for a supply of liquid film-forming printer according to the invention, this object is achieved in that color at room temperature (approximately 15 to 33 ^° C.) is achieved by using the initially different color in one method. Each inking unit called the type, the free surface of the to be transferred 50 has an inking roller 36, 38 or 40 with a conventional printing plate with raised letters that keeps the film sticky during the process. or types of shape and size desired

It is advantageous to use an elastomer as the carrier surface in accordance with the paint application of the

and a printing ink holder as a film-forming color composition. The inking rollers are labeled 42, 44, 46

used, with 55 net. The ones carried by the individual printing plates

If the color film has a correspondingly high level of liquid color layers are successive

heating takes place. transferred to the support surface 18 while the

An advantageous device for performing drum 10 rotates. Each inking unit is 22,24,26 of the method according to the invention sees one species at a distance from the other along the circumferential surface Offset printing machine in front of which a support surface from 60 of the drum 10 is arranged so that between the elastomeric material on the rotating drum, successive paint applications a temporal one a heating device under this support surface, min delay arises. Such a time interval at the earliest an inking unit for transferring the dressing equates a certain change of state (i.e. film pressure on the support surface as well as one on the formation) in the applied color layer before Carrier area, print area that can be moved closely past- 65 Application of the next layer of color. The last color way. Werk 22 is located along the circumference of the drum

With the method according to the invention, it is possible in advance from the transmission station 48 to even on hard objects a certain distance at which the color imprint of

the carrier surface 18 takes place on the printing surface to be printed.

During the predetermined period of time between the application of the color from the inking unit 22 and the subsequent transfer from the carrier surface 18 to the printing surface in the station 48 some changes in the physical properties of the multiple layers of paint film take place. These controlled changes are best understood by the following explanations: To a complete transfer of a color print in an intact state from the support surface 18 to the to achieve the object to be printed without a film residue remaining on the support surface is it, as stated above, requires that the selected color be in the liquid state, among other things is able to wet both the support surface and the object to be printed. She must but have a greater affinity for the object to be printed than for the support surface. Accordingly achieves the film formation that takes place after the last application of paint by the inking unit 22 a transitional state on the heated support surface 18, according to which namely (1) the cohesive forces reach a height within the paint film that the adhesive force between the paint film and the Support surface exceeds and (2) the force of adhesion or sticking energy between the converted Ink film and the area of the object to be printed is greater than the adhesion or adhesive force between the ink film and the support surface. If the film is in this state and that of the Carrier surface 18 carried film brought into intimate contact with the object to be printed is, the separation of the support surface 18 from the object to be printed has the consequence that the Film is completely and intactly transferred to the object to be printed without any release agent is required.

The time interval between the inking unit 22 and the point at which the fulfillment of the conditions (1) and (2) is completed, of course, changes with the color composition used, with the Film thickness and the speed of rotation of the drum 10. In most cases this is Time range for a film thickness of 2.5 to 125 μ between Vso and Vs seconds. However, it can be in some cases are outside this range, especially if one is particularly fast or particularly slow-drying paint is used. The above-mentioned increase in cohesive forces can be achieved in several ways. For example, applies to color formulas Solvent-based drying in air at room temperature for a sufficient period Period of time or, instead, heating of the ink film on the support surface during a correspondingly shorter period of time the solvents for, evaporation and causes the required Degree of change of state. In the case of plastisol or organoleptic paints, a regulated The effects of heat on the paint film produce the desired results. In other cases either drying in the air or heating an oxidizing, polymerizing or other chemical or physical effects which the ge | * 5ί result in the desired results.

Subsequent to the last application of paint by ψ the inking unit 22, the carrier surface 18 and the entire paint layer S is heated by the heating element 20, thereby creating the transition state of this paint film explained above and changing the physical state so that the originally liquid state with a low cohesive force becomes one partially dry paint film with considerable cohesive force and internal cohesion is created, while the film remains sticky and adhesive on its free surface. Accordingly, the color film S on the support surface 18 must be transferred to the object to be printed at this point in time. At this point in time, the object to be printed, for example a metal tray 50, is driven by a conventional reciprocating table 52, which is driven in a horizontal plane below the drum 10 by means of conventional devices (not shown) in a manner that is timed to the rotation of the drum, carried in such a way that the tray 50 is moved to the right (see drawing) when the table 52 is moved, brought into intimate contact with the sticky paint film surface F ₂ . During this contact, the ink film surface F ₂ remains adhered to the tray 50 with a force which is sufficient to overcome the relatively slight adhesion between the surface F ₁ and the carrier surface 18, so that the entire ink film is completely and intactly detached from this carrier surface. when the tray 50 and the support surface 18 are separated from one another again. The carrier surface 18 remains completely clean and free of any ink film residue; it is immediately ready again for a subsequent application of ink.

Although the invention is based on a preferred embodiment of an offset printing machine has been described, the teaching of the invention can also be used with the same success in direct printing Any type surface can be used if only the type surface has the required Properties, namely the ability to release the color film in the manner described, has. For example, metals with a passivated surface as a result of such oxide coatings are considered Carrying area cheap. It was also found that. ,, glass-like surfaces, for example glass surfaces, are excellent as a film carrier and a ensure good removability of the film.

Although the selected support surface (either an offset cylinder surface or a printing form or same type surface) should be sufficiently smooth so that no disadvantageous mechanical connections occur with the color film. has been shown to have smooth surface irregularities such a support surface does not significantly impair the removability of the film, but only a fabric-like or grid-like pattern on the free surface of the Generate transferred movie. Such a pattern gives the image a three-dimensional appearance Effect that can be desirable to a high degree, especially if the transferred image or the Imprint should have a decorative effect.

If the film support surface, for example a fully polymerized one Surface that changes its surface properties over time and the removability of the film difficult, then the support surface must be treated again, renewed or replaced; such,

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For example, to wet quality carrier surface caused by depolymerization, and the polarity of the

degradation of the surface can be caused by the heat color; viscosity, plasticity, mixability

of the radiator 20 or of chemically active reagents and the solvent content of the paint; the time of

gentien originate in the colors used. Effect of the heated support surface and its

The temperature to be used for a specific application and the formulation of the paint itself,

turning color is determined by its relative adhesiveness.

on the object to be printed and the manure does not require excessive contact pressure

Material of the support surface, the working speed between the film to be transferred and the to

ability and other printing requirements, it is only an intimate one

certainly. 10 surface contact that causes adhesion between the

The complete elimination of the color film from the image and the object to be printed

Support surface ensures that each subsequent one is sufficient, required.

The color imprint is clear and free of irregular or blurred boundaries. The full area, the color, the receiving area and the permanent detachment of the color film also enable the temperatures are typical examples that can be used in the production of multicolored prints, since the emergency procedure of the invention can be used. Self-use, the colors in exact congruence, there are also other compositions, in other words, no longer necessary, since the prints of different types can satisfy those in the same way.
Colors can be arranged so that a

Part of each subsequent print at least 20 Example 1

a part of one or more previous on-color additions by weight

prints covered on the support surface. The um cellulose acetate 10 to 20

it said that every color impression produced was very thick γ-butyrolactone 60 to 80

and the color density is correspondingly high, carbon black makes 10 to 15

multicolored images without exact coverage 25

of the various prints possible. If the color of the above recipe in one layer

It also accounts for the complete decrease of 2.5 to 125 μ on the surface of a carrier

Color film or the color films of the heated chloroprene is applied, which during approximately

Support surface at the transfer station 48 is not ¹ Ao to Vs second at a temperature of

only possible with each of several that are kept at 93 ° C, it can be applied to pressure surfaces

the following printing processes a different one from polystyrene, Delrin, cellulose acetate, glass, measuring

Apply color patterns such as sing, copper, chrome plating, vinyl and paper

consecutive numbering, but guaranteed to be transmitted.

also a great color density with every print. If, if on a support surface made of polyynyl alcohol

desired, even the thickness of the color film can be 35 hol or carboxymethyl cellulose, which is based on a tem-

the imprint can be increased by keeping the temperature at 66 ⁰ C, the color loudly

matching inking rollers with the same formulation as above is used, is a complete

Matching colors in two or more successive film transfers onto printing surfaces made of paper or vinyl

provides the following inking units, the successive and Delrin achievable.

of the following color applications are actually additive 40 As an example of the use of direct printing are. In such a case, the entire type area will be a composite of poly-application as an extremely dense film of unusual tetrafluoroethylene or with chrome plating he thickness complete and undamaged on the print, which was kept at a temperature of 93 ° C transfer area. the color film is based on the above recipe

Although the surface to be printed on is generally 45 printing surfaces made of polystyrene, paper, vinyl and cellular ""

Will have room temperature, this is no necessary-unnecessary acetate can be transferred,
final prerequisite for the implementation of this

driving, but it is an increased temperature above example 2

the room temperature possible as long as this tempe- Color additions percent by weight

temperature of the object to be printed below 50 maleic acid resin 10 to 20

the liquefaction temperature of the paint used nitrocellulose (type Vi see.) 5 to 15

lies. Similarly, a lower diethylene glycol ethyl ether is also 20 to 40

Temperature than the room temperature allowable when vinyl chloride dispersion resin ... 10 to 15

only the area to be printed is dry and not titanium dioxide ... 30 to 40

is affected by condensation, around a good 55 Phthalocyanine Blue 4 to 6

adhesive bond between the paint film and the

To allow area. If the color of this recipe is

From what has been said above, it follows that the total layer thickness of 2.5 to 125 μ is applied to a carrier implementation of the method by the control and surface on polyisobutylene, the V50 of the mutual relationship for a number of Fak 60 to Ve seconds depends on a temperature of gates, to which at least one, at 120 ⁰ C is kept, so it can be undamaged on if necessary several of the following belong: The polystyrene and paper transfer.
Temperature of the surface carrying the film; A support surface made of polytetrafluoroethylene at the temperature of the object to be printed; that of a temperature of 93 ⁰ C (200 ⁰ F) conveys an increase in cohesion within the color film; the 65 this color film works very well on polystyrene.
Relationship between color adhesion of the film carrier - a carrier made of chloroprene with a temperature material and the object to which the film of 107 ° C is transferred such a film is to be transferred intact; the ability of paint to paint on polystyrene.

Claims (1)

7 8 Example 3 according to the principles of the invention. Color additions percent by weight It is possible, for example, that by means of so-called Vinyl toluene butadiene mixed powder 20 to 30 of the named thermoelectric effects or others Diethylene glycol ethyl ether 45 to 50 similar effects of the paint containers and the assigned Toluidine-Töner 10 to 15 ^: - ⁵ neten printing plates in an economical way Lithol driver ................. 1 to 3 ^emer temperature within a wide range Titanium dioxide ................... can be kept 5 to 10 below room temperature nen, and in this way the color is applied to the If the color of this recipe in one layer inking works at a correspondingly low temvon 2.5 to 125 μ thick on a support surface held at io temperature. The many changeable ones Butadiene acrylonitrile copolymer, the approximate selection factors allow a wide variety rend Vso to Vs seconds at a temperature of film-forming colors to use. of 93 ⁰ C, is applied, it should be expressly pointed out that the is intact on a polystyrene surface over- printing plates or the carrier surface color in other- wear. * 5 rem should be presented in a liquid state . . may, for example, such colors could be in solid Example4 or powder form with equal success Color additions by weight will be applied as long as the image is at the moment Vinyl chloride vinyl acetate copolymer 40 to 45 its transfer the conditions set out above Plasticizers 40 to 45 ao met. Furthermore, the color formulas do not hang Stabilizer (barium type) 1 to 2 from the use of so-called release agents or Stabilizer (cadmium type) 1 to 2 separating compounds. Should any of the Titanium dioxide. 10 to 20 color additives or components used in each Examples are disclosed, including as release agents or If the color of this formulation can be used in a layer of separating compounds, then these 2.5 to 125 μ thick are attached to a support surface for other reasons. Chloroprene is applied during about V ₅₀ Because of the great advantages it is also possible in up to 5 seconds at a temperature of 163 ° C. Cooperation with the inking unit one automatic is held, it can be left intact on a device that progresses surfaces, such as a numbering device Transfer polystyrene, paper, Delrin and vinyl. 30 stamps, to use and that way the too objects to be printed without interrupting the Example 5 cyclic course of the process continuously Color additions number percentages by weight. Isophorone 50 to 60 Vinyl chloride vinyl acetate copolymer 15 to 20 35 τ. _x . .., Oil-based extender 5 claims: Dimethyl phthalate 5 to 15 · ■ Carbon black 10 1. Method of printing or decorating from surfaces of hard objects with a When paint this recipe in a layer thickness of 40 thick paint, taking on a support surface from 2.5 to 125 μ on a support surface made of dimen- od. Like. Film-forming color masses accordingly thylsioxan is applied, which are applied during about Vso the impression to be created up to Vs second at a temperature of 135 ⁰ C and the liquid film is then treated in such a way is held, it can be left intact on surfaces so that its cohesive effect as well as the adhesive Transferred from paper and vinyl. 45 adhesive effect between the film and the "- The invention provides a method and a front surface of the object becomes stronger than that direction of great adaptability when loading Adhesive effect between film and carrier, see above print a variety of objects in that all of the film is free of residue from the than the temperature of the inking units of the ink itself, the carrier surface is transferred to the surface to be printed. as well as the support area can be carried within a considerable 50, thereby ge ken n-range above and below room temperature indicates that the free surface of the film temperature is variable and the length of time is kept sticky during the process, which the application of paint on the carrier surface remains. 2. Method according to claim 1, characterized in that also over a considerable range indicates that the support area for treatment varies can be, for which either the size of the 55 development of the liquid film layer on a vorbe drum or whose rotation speed or the correct temperature is heated. Distance between the inking units and the printing 3. The method according to claim 1 or 2, characterized station changed along the circumference of the drum characterized in that the film-forming color will. At temperatures of the support surface below mass in dry, powdery state the room temperature, it can be applied to the support surface for applications 60, give, in which particularly fast-drying 4. device for carrying out the VerFarben are useful. Some of these inks can according to claim 1, characterized by be composed so that at room temperature they have a support surface (18) on a rotational temperature extremely quickly "set" or "dry". drum (10), a heating device (20) in the Accordingly, a support surface, which is on the drum (10) below the support surface (18), can be mined Temperature below room temperature at least one inking unit (22, 24, 26) to keep the application will keep this effect under control against the film-forming color masses on the carrier and thereby the use of the color-corresponding surface (18) as well as a surface (18) of the drum (10) tightly past movable pressure surface (50). ^:: . 5. Apparatus according to claim 4, characterized in that the carrier surface consists of an elastomer made of chloroprene, vinyl chloride, carboxymethyl cellulose, tetrafluoroethylene, dimethylsiloxane, ethylene propylene, polyester, urea 10 than (isocyanate polymer), polyamide, polyisobutylene, Butadiene-acrylonitrile copolymer or polyvinyl alcohol. 6. Apparatus according to claim 4, characterized in that the carrier surface (18) consists of a Passivated metal type plate with adjustable temperature. 1 sheet of drawings