CZ1059U1 - Device for influencing drying process, particularly inks of silkscreen work - Google Patents

Description

(54) Equipment for influencing the drying process, in particular inks for screen printing (11) 1059 (13) U

5 (51)

B 41 F 15/06 B 41 F 15/12

From ' ¹ ''τ'

Utility model name;

Technical field

The technical solution relates to influencing the process

Equipment for influencing the drying process, especially colors for screen printing rj cs c

A device for manual or automatic drying of applied paints during screen printing, which enables the arrangement of its elements to provide the desired drying mode, depending in particular on the wavelength of the infrared radiation generated by the heating elements.

BACKGROUND OF THE INVENTION

To date, they have been used for drying inks and color compositions by which textiles are printed. tunnel drying equipment for final color compositions.

intermediate drying of these colors; Drying of already applied paints and The device for intermediate drying of paints consists of a support stand and its own adjustable drying part. The supporting frame is formed by a supporting frame having an H-shaped plan view, in the lower part of which the supporting feet or the like are located. casters. To this support frame are attached to its two ends, opposite the joining bars, the supports of the support guide posts, in which the support guide posts are fixed perpendicularly to the support frame, on which the guide member to which the drying part is fastened provided with a cold air outlet plate below whose slots air heating tubes are located. The regulation performs both current regulation and voltage regulation of the individual heating tubes or the entire heating tube system. Another possible way of temperature regulation of this device is the height change of the dried object from the heat source. Drying tunnels are also known for drying and drying inks and color compositions which are screen-printed on printed objects. In most cases, these devices consist of a number of sections, which are interconnected in such a way as to form a continuous drying chamber, in the ceiling of which they are connected. heating elements such as heating tubes are located on the side walls. In the lower cross-section of the drying tunnel thus formed, the tunnel is provided with a conveying device, i.e. a heat-resistant endless belt for conveying the dried article from one end of the drying tunnel to the other end.

The tunnel temperature is controlled by current or voltage regulation of the power input of the heating elements acting on a component of their infrared radiation spectrum on hardened and dried applied paints or color composition, or by changing their height above the dried parts. A disadvantage of the intermediate ink drying device is that some of these devices are not standardly equipped with a heating tube power control element, so that the temperature control suitable for optimum drying of the applied paint depending on the material properties of the printed article is performed only by height adjustment. and at a suitable height change of the part, whereby at a given initial temperature for the heating of the slots of the rising temperature in this drying device under conditions, a favorable drying effect of the drying part is achieved, this part is secured in height. This type of temperature control is highly dependent on the experience of the operating personnel »the device must be provided with a mechanical part for vertical movement of the drying part with a locking member of its position (eg guide rods)» thereby increasing both structural complexity and space demands and weight of the whole device. Another disadvantage is that in the case of equipment which is not equipped with current and / or voltage input control, the temperature control is carried out simply by moving the heating elements away from the object to be dried, thereby only reducing the heat transfer efficiency, resulting in relatively high energy losses.

The disadvantage of the intermediate color drying device, which is equipped with the heater tube power control element, is that by varying the current or voltage at the heater element terminals, these heater elements depend on these changes as well as the wavelength of the emitted infrared radiation, especially when using pasteurized paints and compositions which require only a certain wavelength range for curing. Failure to observe the required curing conditions, in particular of the pasty-colored paints, i.e., drying in the short and / or short range. If the wavelengths are too long, the drying time of the object is disproportionately increased, thus reducing the productivity of the entire production line. Another disadvantage is that the need to use current or voltage regulation of the heating element input in the drying tunnels varies manually or automatically via the feedback controller of the heating element, depending on the temperature in the tunnel working space, resulting in the fact that se př:

This regulation of the temperature often causes components of the spectrum of infrared radiation, in which the region of the plastisol paint does not undergo such an intensive drying process, which in turn leads to prolonged drying time.

The nature of the utility model

These disadvantages are eliminated by the drying of the block in that it is provided for influencing the process, in particular during screen printing work, which consists of control electronics. The principle of the technical solution is that an element for controlling the ratio of the delay time and the switching time is connected to the control electronics block, preferably an electronic relay, to whose contacts the terminals of the heating elements are connected. The essence is also that the element for controlling the ratio of the delay time and the switching time is connected to the hand controller. Another principle is that a temperature sensor placed in the working space of the drying tunnel is connected to the element for controlling the delay time and the switching time.

The advantage of the apparatus for influencing the color drying process during screen printing is that by a very suitable choice of the mode of operation of the heating elements so that infrared heating is only possible to create optimally that the heating elements radiate in the wavelength range conditions for the curing process especially piastizol paints. The temperature control between drying equipment and drying tunnels is controlled by changing the dwell ratio and the switching time of the heating elements by manual control, respectively. with feedback control. A further advantage of the device is that it is not demanding in terms of construction and manufacture, and its cost of ownership is relatively low.

Overview of drawings in the drawing

The attached drawing is a side view of an arrangement of a drying apparatus for intermediate drying of colors.

Exemplary heater designs

The apparatus for influencing the drying process of particular inks for screen printing works according to an exemplary embodiment is located in a screen drying machine for intermediate screen drying, which consists of a stand A) into whose vertical part a height-adjustable carrier 4 is fixed, fixed by a fixing member 6, e.g. . A drying part 4 is attached to this support 6 at its end. The box-shaped drying part 6 is divided into three parts in its interior space, namely the control electronics block 5, the fan block 6 and the air distribution and heating block. The control electronics socket 5 is in the rear of the dryer part 6, its inputs and outputs being led to the control elements of the control panel formed in the rear part of the dryer part. The control electronics block 5 is provided with an unlabeled element for controlling the ratio of the delay time and the switch-on duration, one of whose outputs being connected to the contacts of the heating elements 2, e.g.

the second outputs are connected to: a controller, which is preferably located on the control panel 8 of the drying element 8t.

The work is carried out in such a way that the optimum temperature and / or thermal input of the drying is determined according to the type and properties of the material to be printed and the properties of the colors to be printed, and then adjusted on the control panel Q by radiating infrared radiation. which is in a fixed set desired range of the spectrum, the ratio of delay and switching of the heating elements 2, corresponding to the specified temperature, respectively. thermal input. In the given case, this device operates in periodic mode during the whole drying period, ie eg switching time ta = 4 s, dwell time tp ⁼ fa s ·

Alternatively, the device is placed in an unmarked drying tunnel. The device is located in the control electronics block of the drying tunnel and is formed, for example, by an electrical relay controlled by a temperature sensing sensor located in the working space of the drying tunnel. This electronic relay is integrated into the control electronics block, thus creating an element for the feedback control of the ratio of the delay time and the switching time. The contacts of the heating elements, such as heating tubes, are connected to the outputs of the feedback element for controlling the ratio of the delay time and the switching length.

The function of this device is that the temperature sensing sensor senses the temperature in the working space of the drying tunnel. If the temperature in the working space of the tunnel exceeds the set temperature limit, the feedback control element of the delay-to-switch-on ratio reacts on the basis of the information of the switching and drying of the temperature sensor, thus switching off the heating elements. This device operates in irregular periodic mode all the time. The switching time t1 of the heating elements and the residence time tp of the heating elements depend on the temperature state of the drying tunnel.

This device can be advantageously used not only for curing (materials) of paints and color compositions for effecting spatially designed products of material requiring a region of thermal radiation spectrum for more efficient curing.

Claims (1)

CLAIMS ON O M F? A N LJ The device for influencing the screen printing operation of the electronics, as indicated by the electronics, is connected to the dwell time and switching element, the electronic relay on which to control the sludge-containing control is changed from the block control block (5) preferably the contacts are the heating element outlets (9) are connected. Process control devices drying drying and screen printing works, according to V.bTp & u 1, that on hand the controller is connected to the right element delays and switching times. regulation length ratio Devices for influencing drying process At net of ties work by USw & u 1, marked by Ž 2 for element for regulation length ratio delays and de i <Y switching them on napojeno sensor and sensor temperature um i s t šrié in work space drying tunnel