Abstract:
A self-expiring badge or label that includes an upper substrate having an upper surface and a lower surface and an adhesive activator layer on the lower surface. A protective layer having a first surface and a second surface is provided, with the first surface of the protective layer being removably attached to and overlaying the adhesive layer. A lower substrate is provided that has an upper surface and a lower surface, the upper surface being removably attached to and overlaying the second surface of the protective layer. A migrating ink pattern is on the lower surface of the lower substrate. To activate, the upper substrate and at least a portion of the lower substrate are removed from the protective layer to leave a remaining portion of the lower substrate having the migrating ink pattern thereon. The migrating ink pattern is then contacted with the exposed adhesive activator layer to activate the migrating ink pattern to migrate through the adhesive activator layer and upper substrate in a selected time interval for viewing from the upper surface of the upper support layer to indicate an expired badge or label. Preferably the migrating ink pattern is contacted with the adhesive layer by folding it onto the adhesive layer. Optionally, to activate the badge both substrates are completely removed from the protective layer and the migrating ink pattern is contacted with the adhesive layer.

Description:
RELATED APPLICATIONS 
   This is a Continuation-In-Part of U.S. Ser. No. 11/325,052, filed on Jan. 5, 2006 now U.S. Pat. No. 7,263,037 issued on Aug. 28, 2007, the entire disclosure of which is incorporated herein by reference. 

   BACKGROUND OF THE INVENTION 
   1. Field of the Invention 
   This invention relates to a one piece self expiring security badge, label, ticket and pass. More particularly, this invention is directed to a one-piece self-expiring security badge or label that is thin and flexible wherein the badges or labels can easily pass through a laser or thermal printer, and can be easily stored in a roller form. Additionally, this invention relates to an improved construction of a color changing time label which enables a computer printer to print and activate the time label before issuing from the printer. 
   2. Related Art 
   Self-expiring security badges or labels have as their core technology a chemical color-changing process that can be easily activated at a specific time. Security badges are only one of the many applications for such technology. Generally, such products are useful because the color changing process is easily activated and after a predetermined period of time has passed and the color changing process is completed, they cannot be used again. Such products have found wide acceptance due primarily to their ‘ease of use’. Such technologies are described in the prior art Haas, Holt and Pedicano patents listed herein and are incorporated herein by reference. 
   Generally, such color changing process is activated by overlaying and adhesively bonding two substrates to each other. Prior to activation the substrates are kept separate. Typically, the top or exposed substrate is an adhesive label and the bottom substrate has a migrating ink or dye on or within its face. When bonded together, the adhesive from the top label dissolves the dye in the migrating ink, causing it to bleed (diffuse) ‘through’ the top label at a controlled rate. After a predetermined period of time, the dye-colored image is displayed through the front of the top material and can be seen by those viewing the badge or label. Such badge or label is thus expired, i.e., “self expired” and cannot be used again. 
   Generally, such known self-expiring badges and labels are initially in two separate pieces, i.e., the top adhesive label and bottom dye or ink containing substrate, and are assembled at the time of issuance, i.e., activation. Because the two substrates are dry materials, they have very long shelf-lives, making these products very commercially practical. However, where there is a high volume of badges or labels issued by, for example, receptionists and security guards the two part construction proves to be inconvenient and labor intensive. There is a need for a simpler badge or label that requires less labor to activate. 
   Several preassembled constructions have been developed, see for example U.S. Pat. No. 5,107,470 to Pedicano et al. In this type constructions, the top substrate and bottom substrate are joined together with a paper liner interleaved between the adhesive on the top substrate and the bottom substrate containing the migrating ink. When the security badge is issued, the issuer separates the two parts by lifting the top substrate and pealing away the interleaving paper liner from the top substrate. This exposes the adhesive underlying the top substrate so that when the two parts are pressed together the top substrate adhesively bonds to the bottom substrate activating the color changing process, i.e., dissolving the migrating ink. This preassembled construction is simpler and more convenient to use, i.e., it is “user friendly.” Such preassembled badges or labels also minimize one of the primary weaknesses of the two part constructions which is the failure of a receptionist or security guard to activate the product when it is issued. This is a common occurrence with badges or labels that come in two separate parts, generally because the receptionist or security guard is untrained or careless in distributing and activating such badges or labels. 
   However, such preassembled badges or labels as exemplified by Pedicano, have several technical problems. First, such preassembled security badges or labels as well as the two piece badges or labels each have a waste liner that needs to be removed and disposed of. If, for example, there are a large number of visitors to a facility, such waste liners can be a substantial nuisance and housekeeping problem, particularly if not disposed of properly. The liners typically have a silicone coating on one side, are slippery and collect static electricity, causing collection problems. Second, such preassembled badges or labels are stiff and rigid because they are constructed from multiple ply layers. For example, a two piece pre-activated badge or label has a top adhesive substrate with three layers, a face stock layer, an adhesive layer and a liner, while the preassembled construction badge or label consists of five layers: a face stock, an adhesive layer, a removable liner barrier, a bottom-substrate face stock, and a bottom-substrate liner. In order to store such badges or labels, they need to be fan folded. Fan folded badges or labels typically lays in stacks about 2-3 inches high and are folded every two or three badges or labels. This requires that the stacks of badges or labels be outside the computer printer and occupy substantial desk space. Since most security badges are issued from a small receptionist desk in the lobby where surface area is at a premium, it is important to employ security badge printers and badge supplies that have as small a footprint as possible. If the fan folded badges or labels were folded every four badges or labels, they stack of badges or labels would be 12 inches long, protruding from the rear of the thermal printer. This is inconvenient and impractical. 
   The applicant is aware of the following prior art (U.S. patents): 
   
     
       
             
             
           
         
             
                 
                 
             
           
           
             
                 
               3,520,124 to Myers 
             
             
                 
               4,408,557 to Bradley et al 
             
             
                 
               4,903,254 to Haas 
             
             
                 
               5,058,088 to Haas et al 
             
             
                 
               5,446,705 to Haas et al 
             
             
                 
               5,602,804 to Haas 
             
             
                 
               5,633,835 to Haas et al 
             
             
                 
               5,633,836 to Langer et al 
             
             
                 
               5,667,303 to Arens 
             
             
                 
               5,699,326 Haas et al 
             
             
                 
               5,715,215 to Haas et al 
             
             
                 
               5,719,828 to Haas et al 
             
             
                 
               5,822,280 to Haas 
             
             
                 
               5,930,206 to Haas et al 
             
             
                 
               5,974,003 to Pedicano et al 
             
             
                 
               6,270,122 to Shadle 
             
             
                 
               6,295,252 to Holt et al 
             
             
                 
               6,452,873 to Holt et al 
             
             
                 
               6,641,691 to Shadle et al 
             
             
                 
               6,741,523 to Bommarito 
             
             
                 
               6,752,430 to Holt et al 
             
             
                 
               6,916,130 to Holt et al 
             
             
                 
                 
             
           
        
       
     
   
   Still further, time labels which change color by a dye diffusion color changing mechanism were first invented in 1980. They have been successfully used for one-time-use security badges and non-reusable indicators of various sorts for many years. In every commercially product, the time label is activated to start the time controlled color changing process by manually applying a self-adhesive front label (front part) onto a back portion label (back part) that is printed with a molecular dye based migrating ink. Upon contact of the pressure sensitive adhesive with the migrating ink, the dye from the ink diffuses into the adhesive to cause the color change. Based on the adhesive composition and the particular dye, the color of the front part label changes to show expiration. 
   Even though the time labels may be computer printed by many types of computer printers, such as ink jet, direct thermal, thermal transfer, etc, the printed label is manually removed directly from the computer or from a roll of previously printed labels and activated by hand in order to begin the color-changing process. This manual issuing of security badges and/or time labels is a major problem for users. There are a number of benefits for having a printer automatically activate the time label before issuing. There are even more benefits to have an unmanned kiosk in a lobby (facility) or unmanned printer issued activated time labels direct to the end-user. Previous attempts to perform this automatic time label activation have failed. 
   Previous attempts to produce a printer-activated-time-label system failed because of the relative complexity of the printers. Also, different chemical activation mechanism have been attempted, but none of them have become commercial products. To the best of Applicant&#39;s knowledge, the only time labels in use are of the dye diffusion type activated by adhesive contact with the migrating ink dye. 
   For example, for a system which uses two different labels combining in the printer itself, two label streams are needed and it is difficult to apply a front label onto a back label because of alignment problems, removing the front label from its liner and applying it to the back part label, training users to reload the printer and removing jams within the printer. 
   Another possible technique is to create a multiple layer time label that is heated to initiate the color changing process. This active chemical process or thermal barrier process where a chemical barrier is breached by heating at the time of activation, appears to be difficult to produce without pin holes in the barrier layers and to control the dye diffusion elements. 
   Another process may be to produce a time label with micro-encapsulated elements that are initiated by mechanical crushing in the printer by passing the time labels through crushing rollers. This process requires the development of very stable encapsulated materials that are resistant to environmental heat and storage. 
   Another process may be to produce a multilayer thermal transfer ribbon which initiates the color changing process upon heat transfer of the materials. This process would also require the development of a printable time label in order to be printed as well as receive the color changing materials from the thermal ribbon. One can conceive of a variety of thermal ribbon coatings and combinations of chemicals which can be transferred to a label substrate in order to produce a color changing process. 
   Still another mechanism would be to employ a liquid activator which is applied to the time labels as they pass through the printing device. Applying the liquid would initiate the movement of the dyes through the opaque white barrier hiding the colored dyes so that the expiring image will be produced on the face of the time label. 
   None of these systems appears to have been practical. 
   Because of the technical difficulties and complicated constructions of all these chemical and multiple part mechanical schemes, none of them have proved practical for commercial products. The current invention has overcome all these difficulties by employing a single piece label structure exactly like standard paper labels and standard direct thermal computer printable labels which have a simple construction and have been well proven to be practical. The activation mechanism is by a simple mechanical rearrangement of the label components during or after printing the label with a computer printer. Hence, this simple mechanical rearrangement requires only simple mechanical components in a printing device. 
   OBJECTS AND SUMMARY OF THE INVENTION 
   It is an object of this invention to provide a one-piece self expiring badge, label, ticket or pass. 
   It is a further object of this invention to provide a one-piece self expiring badge, label, ticket or pass that has a minimal number of waste liners that need to be disposed of after activation. 
   It is another object of this invention to provide a one-piece self expiring badge, label, ticket or pass that is thin, flexible and can be easily stacked, stored and rolled. 
   Another object of the invention is to provide a one-piece self expiring badge, label, ticket or pass that can easily pass through a laser or thermal printer. 
   It is a further object of this invention to provide time labels which change color after a predetermined time interval after activation for high security use by guaranteeing one-time use. 
   It is another object of this invention to provide time labels which change color after a predetermined time interval after activation which can be automatically issued or dispensed to the individual by simply reading electronically the individuals personal identification ID card, visa card, alien card, or any other “trusted” governmental issued ID card. 
   It is an object of this invention to provide time labels which change color after a predetermined time interval after activation without an operator or human intervention. It is an object of this invention to provide time labels which change color after a predetermined time interval after activation with only the blank time labels themselves as expendable components. 
   It is an object of this invention to provide time labels which change color after a predetermined time interval after activation within seconds of demand by computer printing. 
   It is an object of this invention to provide time labels which change color after a predetermined time interval after activation of various sizes, shapes, and color expiration patterns. 
   It is an object of this invention to provide time labels which change color after a predetermined time interval after activation which can be issued by hand or by an automatic dispenser. 
   It is an object of this invention to provide time labels which change color after a predetermined time interval after activation which do not produce chaff and litter. 
   It is an object of this invention to provide time labels which change color after a predetermined time interval after activation that can be printed, activated &amp; issued in one step 
   It is an object of this invention to provide time labels which change color after a predetermined time interval after activation that can be issued with the liner removed (exposed adhesive ready to apply to ones clothing) 
   It is an object of this invention to provide time labels which change color after a predetermined time interval after activation that permit years of shelf-life to the supply label stock and the printers loaded with labels for infrequent use 
   It is an object of this invention to provide time labels which change color after a predetermined time interval after activation which requires no heater adjustments or setting, no ribbons, no inkjet or toner supplies, no ambient temperature adjustments 
   It is an object of this invention to provide time labels which change color after a predetermined time interval after activation that is tamper resistant because once the migrating ink touches the adhesive; it cannot be lifted off or stopped. 
   It is an object of this invention to provide time labels which change color after a predetermined time interval after activation with different times for time labels accomplished by simply supplying different time label stock. 
   All of the foregoing objects of this invention and others are achieved by the self-expiring badge or label of this invention. The badge or label comprises an upper substrate having an upper viewing surface and a lower surface and an adhesive activator layer on the lower surface. A protective layer having a first surface and a second surface is provided, with the first surface of the protective layer being removably attached to and overlaying the adhesive layer. A lower substrate is provided that has an upper surface and a lower surface, the upper surface being removably attached to and overlaying the second surface of the protective layer. A migrating ink pattern is on the lower surface of the lower substrate. To activate, the upper substrate and at least a portion of the lower substrate are removed from the protective layer to leave a remaining portion of the lower substrate having a portion of the migrating ink pattern thereon. The migrating ink pattern is then contacted with the exposed adhesive activator layer to activate the migrating ink pattern to migrate through the adhesive activator layer and upper substrate in a selected time interval for viewing from the upper surface of the upper support layer to indicate an expired badge or label. Preferably the migrating ink pattern is contacted with the adhesive layer by folding it onto the adhesive layer. Optionally, to activate the badge both substrates are completely removed from the protective layer and the migrating ink pattern is contacted with the adhesive layer. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
     Other important objects and features of the invention will be apparent from the following Detailed Description of the Invention taken in connection with the accompanying drawings in which: 
       FIGS. 1A and 1B  is a schematic representation of prior art, self-expiring security badges or labels having a two-part construction. 
       FIGS. 2A and 2B  show, respectively, a perspective view and cross-sectional view of the one-piece, self-expiring badge or label of this invention prior to activation. 
       FIGS. 3A and 3B  show, respectively, a top plan view and a bottom plan view of the self-expiring badge or label of this invention prior to activation. 
       FIGS. 4A ,  4 B,  4 C and  4 D show, in a stepwise manner how the one-piece, self-expiring badge or label of this invention is activated. 
       FIGS. 5A ,  5 B and  5 C show in a stepwise manner how a second embodiment of the one-piece, self-expiring badge or label of this invention is activated. 
       FIG. 6  shows another embodiment of the one-piece, self-expiring badge or label of this invention being activated. 
       FIG. 7-9  shows the method and apparatus to print, activate and issue labels of this invention. 
   

   DETAILED DESCRIPTION OF THE INVENTION 
     FIG. 1A  depicts a prior art self-expiring security badge or label  100  having a two-part construction. In this type of badge or label  100  the top substrate  102  consists of a clear substrate with a special opaque, e.g., white, adhesive coating on its back surface. The front or top surface of the top substrate  102  is typically printed with the security indicia  103  or design indicia  106  as viewed  108  from the front, and has an adhesive backing  110 . The bottom substrate  101  includes a migrating ink pattern or indicia  104  printed on its front surface. When the self-expiring badge or label is activated by placing the top substrate  102  adhesive  110  in contact with the bottom substrate  101 , the migrating ink  104  diffuses through the adhesive  110  and becomes visible to the observer  108  through the front face  102  of the badge or label  100 . Thus, the initial opaque or white (valid) security badge  100  turns into the ‘visually void’ badge. 
   An improved version of this two-part construction was developed, i.e., U.S. Pat. No. 5,107,470 to Pedicano et al. and consists of a preassembled badge or label. Referring to  FIG. 1B , such preassembled badge or label  120  consists of a top substrate  122  and bottom substrate  126  which are attached to each other along one edge  121  so that only a single physical unit exits for handling. However, this preassembled badge or label  120  requires four separate layers: the top substrate label  122  with an adhesive layer  123  and a liner  124  covering the adhesive layer  123  to provide a barrier from the migrating ink indicia  125  that is on the bottom substrate  126 . The front of the top substrate  122  is printed with the security indicia or design on the front surface. The bottom substrate  126  consists of a migrating ink  125  printed on the front face, an adhesive layer on the rear face, and a liner  127  covering the adhesive layer. Even though this preassembled construction is an improvement in handling and pre-aligning the top substrate  122  with the bottom substrate  126 , the four material layers still present functional difficulties and cause a litter problem. 
   The one-piece security badge or label described and claimed herein provides a superior solution to the functional and handling difficulties of these previous preassembled constructions and additionally provides improvements in the production and use of self-expiring security badges or labels. 
     FIGS. 2A and 2B , shows the self-expiring badge or label of this invention prior to activation and as formed as a die cut label-like structure  3  on a continuous silicone liner web  5 . The top substrate  7  has an identifying or security indicia  10  on the top surface thereof and an adhesive layer  8  on its underside for attaching to a display surface, e.g., clothing. The top substrate  7  is die-cut, preferably as a rectangle, on the silicone liner  5  that protects the adhesive layer  8 . The self-expiring badge or label of this invention further includes a migrating ink pattern  12  printed on the backside or opposite side of the liner  5 . The migrating ink pattern  12  contains a dye that migrates upon activation. The migrating ink pattern  12  and dye are inert and immobile when in contact with materials in which the dye is insoluble, e.g., the face of the top substrate  7 . The migrating ink pattern  12  will not bleed when in contact with the various areas of the front or back of the web. This permits the continuous length of liner  5  containing the top substrate  7 , adhesive layer  8  and migrating ink pattern  12  to be rolled up on itself. Thus, migrating ink pattern  12  is separated from the activating adhesive  8  intended for its eventual interaction. The liner  5  provides a protective barrier between the migrating ink pattern  12  and the activating adhesive  8  on the top substrate  7  of the expiring badge  3 . 
     FIGS. 3A and 3B , shows, respectively, the top plan view and bottom plan view of the self-expiring badge or label of this invention prior to activation and use and as formed as a die cut label-like structure  3  on a continuous silicone liner web  5 . A die cut bottom substrate  14  is cut from the liner  5  with the migrating ink  12  printed thereon. The die cut bottom substrate  14  can be any size or shape. Preferably substrate  14  is a rectangle near one end of the badge and has been die cut with few or no ties to the liner  5 . 
     FIGS. 4A through 4D  show in a stepwise manner how the one-piece, self expiring badge or label of this invention is activated and used. In  FIG. 4A , the top substrate (label)  3  is peeled from the liner  5  (arrow  16 ) exposing the adhesive layer  8  on the underside thereof. Since the die cut section  14  with migrating ink pattern  12  thereon is not attached to liner  5  it remains attached to the adhesive layer  8 . 
   Referring to  FIGS. 4B and 4C , after the label  3  of the badge is removed from the liner  5  the person issuing the badge simply folds the badge  3  near the edge of die cut bottom substrate  14  ( FIG. 4B ) and presses it in contact with the adhesive layer  8  ( FIG. 4C ). The badge is now activated and ready to issue to a person. As shown in  FIG. 4D , the remaining portion of the adhesive layer  8  is used to attach the badge to a visitor&#39;s clothing. Since there are no loose silicone liner pieces to litter the work area, this one-piece badge is more user friendly. Also, the continuous webliner  5  can be rolled up and easily disposed of in a small roll. Although,  FIGS. 4A-D  show one means of activating the badge or label, there are several means of activating the badge or label with this new type of construction. 
     FIGS. 5A-C  shows an alternate construction of the badge or label  30  of this invention. In this arrangement, inactivated badge or label  30  can have the bottom-substrate  32  removably and adhesively attached to the underside of top substrate  36 . The back of the bottom substrate  36  has the migrating ink pattern  34  printed thereon. The top substrate  36  has an activating adhesive on the back thereof. In  FIG. 5A , the bottom substrate  32  is fully removed from the top substrate  36  prior to issuance of the badge or label. Optionally, still referring to  FIG. 5A , the bottom substrate  32  and top substrate  36  can each be removably adhered to opposite sides of a silicone web liner (not shown). In  FIG. 5B  the bottom substrate  32  is being inverted such that the migrating ink pattern  34  is facing the activating adhesive on the underside of the top substrate  36 . In  FIG. 5C  the top substrate  36  and the bottom substrate  32  are pressed together, the adhesive activating the migrating ink pattern  34 . 
   In this alternate construction of the badge or label  30 , both the top and bottom substrates  36 ,  32  may be die cut on a silicone liner similar to the configuration shown in  FIGS. 2A &amp; 2B . The bottom substrate  32  may be circular or rectangular and may be cut to a size and shape of the migrating ink pattern  34 , and it may be fully die cut from the liner or it may have small die cut ties holding it onto the liner. These ties may be useful in maintaining the bottom substrate  32  when in circle form, from becoming detached when the web is rolled tightly. Tight rolls cause the liner to flex and curl, in which case a bottom circular substrate  32  may curl and separate at its edges. Optionally, additional silicone may be coated onto the back or underside of the liner to which the bottom substrate  32  is mounted making it easier to remove the bottom substrate  32 . 
   As shown in  FIG. 5A-C  when the top substrate  36  is removed from the bottom substrate  32 , the issuer, e.g., guard or receptionist, merely turns it over as shown by the arrow in  FIG. 5B  and attaches it to the adhesive again. This activates the self-expiring badge or label, the migrating ink  34  from the bottom substrate diffusing through the top substrate  36  to become visible on the face of the top substrate  36  when the badge or label has expired after a predetermined period of time has passed. 
   It may also be possible to apply the migrating ink pattern  34  to the back of the liner by other means, such as applying a removable coating to the back face of the silicone liner. It also may be possible to print the migrating ink on the back of the silicone liner in such a manner that the ink can be lifted off the liner itself by simply touching the adhesive on the top substrate  32  to the migrating ink pattern printed on back of the liner, the migrating ink pattern becoming firmly attached to the adhesive and hence, the migrating ink separates from the back of the liner and is lifted onto the back substrate  36  adhesive. This permits the migrating ink pattern to become attached to the top substrate  32  without the necessity for a substrate behind the migrating ink pattern. 
   In all of these embodiments, prior to activation, the top substrate adhesive is separated from the migrating ink pattern by a protective layer therebetween. The migrating ink pattern remains inert until it is in contact with the adhesive on the underside of the trop substrate. 
   This new construction of self-expiring security badges or labels produces a dynamic self-adhesive ‘label-like’ product that is constructed in exactly the same manner as standard adhesive labels. By offering a self-expiring product in the same format, thickness, and flexibility as plain paper labels, the same printing equipment can be used and the users of the product do not have to be trained in handling a more complicated product with multiple layers. The benefits of this new construction are a simple face stock and liner construction with the same mechanical properties as standard label stock, pre-aligned folding edges that permit easy handling, even with one hand, no separate waste paper that creates litter, lower cost because of the simpler construction, more badges or labels on each roll to accommodate small thermal printers, rolled badges or labels instead of fan folded badges or labels. 
   In another aspect of this invention, the time label material is an adhesive coated facestock attached to a silicone liner. As shown in  FIG. 6 , the facestock  3  with adhesive  16  on its lower surface is attached to the silicone liner  7 . The liner  7  has slits  12  along the length of the liner that separate a portion of the liner that has been printed with migrating ink  9  and a portion that has not been printed with migrating ink  10 . With lateral cuts  11  in the face stock  3  as shown in  FIGS. 6A and 7A , the web of material is cut into individual labels  21 . These labels can be of any size, in any direction, and the migrating ink and die cuts in the liner can also be of any form and location. 
   As shown in  FIG. 8A , label  102  is the time label with its wide edge across the web and the liner  104  is also cut across the web so that when the label is removed, the cut portion of the liner  104  can be removed with the adhesive on the facestock. As shown in  FIG. 8B , item  102  is the label removed from the web of liner  106  and the portion of the liner  104  that is die cut remains attached to the time label  102 . From all these various constructions, one can see that the constructions of the label with a portion of the liner attached can be of many different forms. Time label  102  of  FIG. 8B  shows the cutout area of liner  104  so that the liner with the migrating ink  108  can be removed as a single unit in order not to leave individual pieces of chaff to dispose of. With two piece constructions of time labels, chaff remains behind after activation of the time label and this causes substantial nuisance and hazard problems. In all these embodiments of the invention, the time label is separated from a single web thus providing an efficient and convenient means of disposing of the waste liner. 
   In  FIG. 8C , the color changing portion of the face of the time label  112  may be along the top edge or along the bottom edge  110 . This is preferred because horizontal bands are easier to see than vertical bands. Also, the printed data will generally be horizontal in these areas and thus, the color changing background will obliterate the relevant data such as the date or heading. 
   Continuing with the construction shown in  FIG. 6 , and in particular  6 A and B, the construction of the web of material  21  consists of an adhesive coated facestock and a silicone coated liner. The observer  17  will view the time label from the front and see the direct thermal coating  18  which prints dark when passed through a thermal printing device. The clear substrate  5  is coated on the lower surface with adhesive  16 . The liner substrate  7  is coated with a silicone release coating  20  so that the adhesive  16  can be removed without difficultly. A portion of the lower surface of the liner  7  is printed with migrating ink  9  which will provide the color changing means for the time label. 
   The web of material as shown in  FIG. 6  can be passed through a thermal printing device so that information  14  can be printed on the front of the time label. The time labels have all have a printable facestock with a white or opaque adhesive  16  on the back surface, a liner with migrating ink  9  printed on the back surface, and a die cut liner  7  so that a portion of the liner with migrating ink can be folded along  23  and brought into contact with the adhesive from the facestock. This will cause the activation of the time label color change as the dye from the migrating ink  9  diffuses into and through the white adhesive  16  so that the color of the dye appears on the front of the time label to be seen by the observer. 
     FIGS. 6-9  show a variety of means of activating the time labels. In  FIG. 7 , the label is made symmetrical with migrating ink  9  printed on the two outer edges of the liner. Of course, an alternate construction can be made with migrating ink on only one side of the liner. The label can be lifted off the liner and folded by hand as shown in  FIGS. 7  C, D, E where the label  30  is lifted off the liner and the two edges  32  can be folded over by hand and attached to the exposed adhesive  35 . The two ends  32  with the migrating ink become attached to the adhesive  35  in the middle of the label so that two edges of the time label change color to show expiration after the functional use of the time label. 
   As shown in  FIG. 7F , the folding operation can also be performed by any of a variety of mechanical mechanisms which could be incorporated into a thermal printer or other issuing device. A vacuum device  40  can be designed to pick up the label  44  and hold it into positron so that the folding wings  42  can rotate the migrating ink portions of the label  48  onto the adhesive  35  in order to activate the timing mechanism. Such an assembly of the time labels places the migrating ink  9  in contact with the white adhesive  35  so that after a predetermined time interval, the observer will see the color change. 
   This label is symmetrical and permits equal folding pressure to be applied on each side. At times this symmetrical operation is beneficial, however it may also be asymmetrical with folding on one side. 
   Another activation mechanism which may be useful for large time labels and single edge time labels is shown in  FIG. 9 . In this arrangement, the web of time labels rests on a platform  204  and is drawn over a peel edge  205  by pulling the liner  206  around the sharp edge of the peel edge  205 . The labels  202  ride along the platform  204  and are peeled off the silicone liner  206 , by means of the angular edge device  205 . The label  202  remains partially attached to the liner  206  and is suspended in air away from the angular edge  205 . A vacuum holding platen  200  attaches the time label to the flat platen surface so that the time label can be manipulated. This is done by a vacuum system which employs holes  201  in the platen itself. 
   As shown in  FIG. 9B , the vacuum platen  200  is brought into close proximity to a folding arm  208  so that the migrating ink end of the time label  104  can be manipulated and folded over onto the adhesive of the time label. The vacuum platen  200  holds only a portion of the time label  202  so that it can keep the migrating ink end of the time label  202  unsupported for manipulation purposes. 
   As shown by progressive movements of the folding arm relative to the time label,  FIG. 9  B, C, D, E, F, the time label is folded along the edge of the liner  104  that is held in position by the vacuum platen  200 . The time label  202  may be perforated along this fold line in order to facilitate the folding process. In performing this operation, the migrating ink adheres to the adhesive of the time label and initiates the dye migration so that the time label is activated and will change color after its prescribed time. In the final stage of folding as shown in  FIG. 9F , the vacuum platen  200  supports the label  202  while the folding platen  208  presses the migrating ink folded area onto the adhesive to insure a tight bond. The activated time label can then be passed through the issuing slot  212  of the printing device for removal and use by the recipient. 
   These mechanical activating mechanisms are but a few of the many arrangements that can be conceived for folding over adhesive labels such as the time label. Another folding mechanism that could be used to print and activate these time labels is one which presents the time label within the adhesive facing up at the exit slot  212 . In this design, the label web is drawn over an inverted sharp angle where the time label is released and the vacuum platen is below the time label. Thus, holding the label adhesive facing up would provide a benefit that if the time label is not removed from the exit slot  212  immediately, the adhesive would only be exposed to air and thus, not encounter a sticking problem within the machine. The individual, such as a visitor, can pick up the time label (now a time-expiring visitor badge) with their fingers at any future time from the printer or kiosk. 
   The color changing time label shows its color change by developing a color area along the top or bottom edge of the badge. This is particularly beneficial for viewing by the human eye because the color bar extends horizontally. In designing standard visitor or other temporarily identification badges, this horizontal band is beneficial because it provides an area for printing the date or the day code so that this time-indication information is easily colored and provides an important means of identify valid identification badges. 
   There are numerous benefits:
         Migrating ink on the edge design may be better than the interior fold over design because it is easier for automated mechanically folding activation   Symmetrical two edge design permits machine fold-over for activation by applying equal force opposed to each other   Self-folding of an adhesive label along the top edge of a time label as described may provide a superior, less failure prone, device for printing, activating, issuing   A time label with all the chemical ingredients, dyes, etc contained within single label construction itself   A time label with only one supply (replacement) item—the roll of labels   Time labels which permit easy hand activation   Time labels without chaff   Time labels that can be printed, activated &amp; issued in one step       

   Time labels can be issued with the liner removed (and having the adhesive exposed and the label ready to apply to ones clothing).
         Time labels of this type permit years of shelf-life   Device to issue (and print) activated time labels which requires no heater adjustments or setting, no ribbons, no inkjet or toner supplies, no ambient temperature adjustments   A construction of a time label that is tamper resistant because once the migrating ink touches the adhesive, it cannot be lifted off or stopped.   A time label system where the time labels can be issued both by hand or by a machine. If the machine breaks or there is no power, time labels still work such as a disaster scene or emergency site.   A fold-over activation means which eliminates complicated mechanical mechanisms   Different times for time labels can be accomplished by simply supplying different time label stock. No machine adjustment needed.   Different size labels do not require different ribbons or liquids in these machines.       

   While various changes may be made in the detailed construction and processes of this invention, it will be understood that such changes will be within the spirit and scope of the present invention. Having thus described the invention in detail, it is to be understood that the foregoing description is not intended to limit the spirit and scope thereof. What is desired to be protected by Letters Patent is set forth in the appended claims.