The present invention relates generally to high speed plastic card manufacturing systems and methods.
Conventionally, thick plastic cards, such as those used as prepaid telephone cards, are manufactured using methods having a series of steps shown diagrammatically in
To accomplish these steps, typically flat sheets of card stock are processed though multiple separate machines. These flat sheets can only be made into a relatively small number of cards per sheet (ordinarily between 25 and 50) and must be moved by a human operator between separate machines throughout the printing process.
While it might seem more efficient to use rolls of plastic stock from which a greater number of cards may be made along with a conventional mechanically driven printing press in place of individual sheets and separate machines, this is not possible because of limitations of standard presses. Specifically, it is very difficult to align a card stock for the thick plastic cards and the print heads of the press to correctly print different colors on the same rolled card stock, for example, as part of a standard four-color printing process. Conventional mechanically driven printing presses simply do not have sufficient accuracy to properly align rolled card stock being printed in several passes in the same press. The stock will tend to stretch and flex within the press, causing different passes of the printing heads to occur either too early or too late. This problem of misalignment in the stock is compounded by the thicker plastic stock, which is preferred by customers for calling cards and similar applications. Furthermore, the inherent curvature of rolled stock further frustrates the smooth passage of the stock through the printing line.
As such, it is currently necessary to use flat sheets at least for the initial printing step so that they may be properly aligned with the printing heads during the initial printing step. Accordingly, a separate, stand-alone machine is typically used to register and initially print flat plastic sheets of stock material. Once initial printing is complete, a human processor takes the printed sheet and places it in a separate machine for application of the magnetic tape.
As is known in the prior art, separation of the individual cards from the substrate may be achieved using a die cutting process, wherein the cards are normally ejected through the base of the die cutting unit after which point the waste material is allowed to pass through the unit.
However, because it is difficult to collect the finished cards ejected from the die cutting unit in a manner which preserves the order in which they were originally produced in their substrates, and because prepaid telephone cards and the like are often designed to be shipped in numerically ordered lots, variable printing cannot be done on the cards before they are separated from their substrates. As such, once the completed cards from an individual sheet or group of sheets are separated and collected, they must be taken to a further processing equipment. This equipment then encodes variable or fixed data to the encoding tape if available. Another station then applies variable printing to the individual separated cards which then go to the labeling/foiling station to produce a finished product which may be shingled onto a conveyor to be collected and packaged in an orderly fashion.
All of these steps, multiple separate machines, and human interventions make processing thick plastic card stock currently very time consuming and expensive. However, because customers prefer thick plastic cards as a source of value (as opposed to paper cards or very thin plastic cards), the multi-step, machine, and human intervention manufacturing process is widely used today.
In an aspect of the invention, a system and method is provided for creating a fully formed printed card with a magnetically encoded strip in a continuous, single pass fashion.
In an embodiment, a printing system includes a web flexographic press programmed to receive a roll of thick card stock and an automated magnetic strip applicator and encoder receiving the roll of thick card stock from the web flexographic press and laying and encoding a magnetic strip thereon. The roll of thick card stock has a thickness greater than 12 mils. In one embodiment, the thick card stock has a thickness between 12 and 30 mils.
In one embodiment, the web flexographic press is a servo operated press, which performs four-color flexo printing on the roll of thick card stock. The printing system may also include a variable printing and foil applicator device, as well as a card separator.
In another embodiment, a printing system includes a web flexographic press and an automated strip applicator and encoder. The web flexographic press receives a roll of thick card stock and has an unwinder that is adapted to unwind the roll of thick card stock into a continuous web. The automated strip applicator and encoder receives the web from the web flexographic press and lays and encodes a magnetic strip thereon. Here, the web has a thickness greater than 12 mils.
In one embodiment, the thick card stock has a thickness ranging from 20 mils to 30 mils.
In one embodiment, the web flexographic press is a servo operated press adapted to perform five-color color flexo printing on the web.
In one embodiment, the printing system further includes a variable printing and foil applicator device adapted to receive the web from the automated strip applicator and to print a variable data thereon. The variable printing and foil applicator device may be further adapted to apply a scratchable foil over the variable data to obscure the variable data. The printing system may further include a card separator adapted to receive the web from the variable printing and foil applicator device and to separate the web into individual finished cards.
In one embodiment, the printing system further includes a card separator adapted to receive the web from the automated strip applicator and to separate the web into individual finished cards.
In one embodiment, the web flexographic press includes a plurality of forward print stations, wherein the forward print stations include a first print assembly, a second print assembly, a third print assembly, and a fourth print assembly, and wherein the first print assembly, the second print assembly, the third print assembly, and the fourth print assembly are serially connected to each other. The forward print stations may further include a laminating assembly coupled to apply a clear coating to the web output from the fourth print assembly. In one embodiment, the forward print stations include a fifth print assembly, and wherein the laminating assembly is coupled between the fourth assembly and the fifth assembly. Alternatively, the forward print stations may further include a fifth print assembly, and wherein the laminating assembly is coupled to apply the clear coating to the web output from the fifth print assembly.
In one embodiment, the flexographic press is adapted to apply a substantially constant torque to the thick card stock throughout the press to maintain a substantially constant tension to the continuous web.
In yet another embodiment, a printing system includes a web flexographic press adapted to receive a roll of thick card stock and having an unwinder adapted to unwind the roll of thick card stock into a continuous web and a variable printing and foil applicator device adapted to receive the web from the web flexographic press and to print a variable data thereon.
In one embodiment, the variable printing and foil applicator device is further adapted to apply a scratchable foil over the variable data to obscure the variable data.
In one embodiment, the printing system further includes a card separator adapted to receive the web from the variable printing and foil applicator device and to separate the web into individual finished cards.
The accompanying drawings, together with the specification, illustrate exemplary embodiments of the present invention, and, together with the description, serve to explain the principles of the present invention.
a shows an in-line printing apparatus according to an exemplary embodiment of the present invention;
b and 2c show a decuring station according to one embodiment of the present invention;
d shows an in-line printing apparatus according to another exemplary embodiment of the present invention;
a, 4b and 4c show individual steps of a card separation process according to one embodiment of the present invention; and
Before any embodiment of the invention is explained in detail, it is to be understood that the invention is not limited in its application to the details of construction and arrangements of components set forth in the following description, or illustrated in the drawings. The invention is capable of alternative embodiments and of being practiced or being carried out in various ways. For example, paper stock could be used in place of plastic stock with the apparatus as described herein. Also, it is to be understood that the terminology used herein is for the purpose of illustrative description and should not be regarded as limiting.
In the following detailed description, certain exemplary embodiments of the present invention are shown and described, by way of illustration. As those skilled in the art would recognize, the described exemplary embodiments may be modified in various ways, all without departing from the spirit or scope of the present invention. Accordingly, the drawings and description are to be regarded as illustrative in nature, rather than restrictive. There may be parts shown in the drawings, or parts not shown in the drawings, that are not discussed in the specification as they are not essential to a complete understanding of the invention. Like reference numerals designate like elements.
a shows an in-line printing apparatus according to an exemplary embodiment of the present invention. The printing line 200 of
In an exemplary embodiment of the present invention, a programmable web flexographic packaging or “shaftless” press system is used. With such a system, large rolls of thick plastic stock substrate rather than smaller flat sheets may be processed rapidly and quickly in an in-line integrated printing system. As such, hundreds or thousands of thick plastic cards may be completely processed from start to finish using the present system in a single pass. Such a system has advantages in both cost (i.e., lower cost) and speed (i.e., higher speed) over traditional systems.
In a “shaftless” press, such as the one shown in
Servos have several uses, including providing accurate motion control without the need for human attendants, accurately maintaining moving parts through mechanical load variations, controlling a high-power load from a low-power command signal, and controlling an output from a remotely located input. While these objectives might theoretically be attained by a nonfeedback system, if extremely accurate calibrated components were available, the self-calibration of a closed-loop feedback method permits economical design and production of accurate systems using primarily inaccurate components given that a typical servomechanism requires only a few of its components to have a high accuracy.
By using a web flexographic packaging press in the printing line 200, registration stability is achieved by precisely balancing each driven axis in the printing line 200 to ensure that a constant torque is applied to the card stock throughout the press. In one embodiment of the present invention, the printing line 200 uses multi-point closed loop tension control and has independent tension zones as well as digital servo drives on each driven axis. As such, an extremely constant web tension can be maintained throughout a range of speeds resulting in very accurate registration stability. Such registration stability is not possible with a mechanical or “shaft-driven” printing press.
Without this constant torque, parts of the card stock may be advanced or delayed along the printing line. This is especially problematic for multi-pass printing applications including four-color printing, because a portion of the card stock which is improperly advanced or delayed along the printing line will receive a portion of its graphic too early or too late, causing misalignment with graphics printed at other stations along the line.
Because a web flexographic packaging press allows rolled card stock to be used, it is no longer necessary to provide separate machines to perform each step of card manufacture. Steps including magnetic tape application and encoding, variable printing and foil application, and card die cutting and separation, which were all formerly performed separately on individual sheets or card stock, can now be performed on the same printing line 200 on different sections of the same continuous card stock. To this end, components have been added to the printing line 200 past the minimum required for simple four-color printing. These components will be described below in further detail in the context of
As shown in
In one embodiment, the printing line 200 features infeed and outfeed tension systems that are independently servo driven. In another embodiment, large diameter plasma coated rollers may be used to drive the continuous card stock. These drivers ensure total tension isolation between the tension zones for unwinding, printing, converting and rewinding the continuous card stock. In yet another embodiment, tension within the print zones is monitored via load cells, which in turn control the infeed drive. As a result, a constant tension is maintained throughout a range of speeds, regardless of the thickness or stiffness of the stock and its natural behavior in the printing line 200.
The continuous card stock (or web) passes through the unwinder 210 over a tension control dancer arm 215 (under the web holding unit 211). The tension control dancer arm 215 helps to maintain a constant tension in the card stock (or web). Further, along the printing line 200, the web guide 216 having an electronic sensor is provided. Below this, a tension drum 217 is placed, ten inches in diameter in this embodiment, which also helps to maintain a constant tension in the card stock.
Forward print stations 250 are then provided to print the initial graphics on the continuous card stock passing through the printing line 200. In one embodiment, the card stock undergoes at least four-color color flexo printing in the forward print stations 250 wherein graphics and text are printed onto the card stock. As shown in
In one embodiment, after one or more of the color flexo printing processes, a clear coating, preferably varnish, may be applied to the card stock using, for example, a laminating assembly 7 as shown in
Referring back to
After the forward print stations 250, a spacer module (or spacer unit assembly) 240 is placed to enable reverse printing. The spacer module 240 is followed by two dedicated reverse print stations 230. The reverse print stations 230 incorporate print cylinders and may be fitted with a reverse angle doctor blade ink pan as well as UV drying devices. In one embodiment, the reverse print stations 230 may be fitted with a fully enclosed doctor blade as well as an ink pump for reverse printing.
Also, as shown in
In
Further along the printing line 200, a magnetic write/read encoding assembly 270 and a die base and hot foil unit assembly 260 are placed to allow for the application of a magnetic strip to the cards being printed on the continuous card stock and to encode the magnetic strip. The die base and hot foil unit assembly 260 includes a hot foil unit 267, and an unwind and rewind unit 266. The magnetic write/read encoding assembly 270 may be equipped to encode up to three tracks of data in a single magnetic strip. The hot foil unit 267 is positioned in a converting cassette.
In one embodiment, a premanufactured strip of low or high coercivity magnetic media is unwound from a supply roll and is applied to the back of the card stock in the die base and hot foil unit assembly 260. The strip has an adhesive backing that is fixed to the card stock by a conventional hot stamp unit. One, two or three tracks of encoded data are written on the strip via the magnetic write/read encoding assembly 270. The data on the magnetic strip may be read for verification by the magnetic write/read head.
In one embodiment, the in-line magnetic card encoding performed in the magnetic write/read encoding assembly 270 is supported by a magnetic controller board, which supports single track encoding along the strip. Thus, the insertion of additional magnetic write/read encoding assemblies (or magnetic controller boards) allows simultaneous encoding of two (2) or three (3) tracks of card data along the strip. Furthermore, the magnetic controller board supports high and low coercivity magnetic media encoding by adding or removing a high current driver module and booster power supply. Further along the line, the magnetic write/read encoding assembly 270 may be provided and/or designed according to the user's specifications for locating an encoding system and/or an ink jet. In the embodiment shown, the magnetic write/read encoding assembly 270 is provide in a one and a half meter long cabinet.
After this, a converting section assembly 280 is placed having two die base units (or die cassette units) 285 with two servo driven die cassettes as well as die pressure indicators. The maximum repeat for these cassettes is twenty four inches. The cassettes are used to die cut finish individual cards from the continuous card stock. A vacuum extraction box 286 is then used for the removal of any chaff produced by the die cutting process. In the embodiment shown, vacuum sources are not provided as part of the vacuum extraction box 286. The converting section assembly 280 also includes a servo driven outfeed pacing roller 287, which leads finished cards to a shingling conveyor 290a of a delivery system 290. Here, these cards are overlapped on a delivery conveyor belt for product collation. In addition, one embodiment of the above described card separation system (or die cutting part) is described in more detail below with reference to
Finally, a rewinder (or a 60° rewind assembly) 295 is provided at the terminus of the printing line 200. In the embodiment shown, this rewind is forty inches in diameter and does not include a reel lift mechanism.
When a web of plastic card stock is provided on a roll, such as that which may be loaded onto the unwinder 210 of
To address this issue, in one embodiment of the present invention, a decuring station is provided as shown in
Turning now to
In one embodiment, start and stop synchronization of the printing line 200 is provided by an image synchronization controller. This subsystem provides card based delays that enable and disable printing and encoding for each device on the line. This is made possible given that while each card denoted by the individual card footprints 310 is part of the continuous card stock at the time of printing or encoding, it is in a discrete, pre-determined location on the continuous card stock. Effective synchronization can be accomplished by coordination between sensors that identify the preprinted mark 350 on the card stock. Synchronization control determines a precise location for a card based on the controlled speed of the card stock as it passes through the printing line 200 by identifying the edge of the card upon sensing the preprinted mark 350. Based on this information, an image synchronization controller provided as part of the printing line 200 signals a registration controller to delay or advance the card stock, so that it may be properly registered.
a, 4b and 4c show an alternative embodiment of a card separation process combining die and bladed processes. In each of
Next, the card stock passes through the horizontal cutting rollers 530, which make the horizontal cuts 430 as shown in
Once all the separation procedures have been performed by the rollers 520, 530 and 540, the waste stock web 505 is rolled onto a rewind 595, which, in the embodiment shown in
While the invention has been described in connection with certain exemplary embodiments, it is to be understood by those skilled in the art that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications included within the spirit and scope of the appended claims and equivalents thereof.
This application claims priority to and the benefit of U.S. Provisional Application No. 60/808,832, filed on May 25, 2006, the entire content of which is incorporated herein by reference.
Number | Date | Country | |
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60808832 | May 2006 | US |