Patent Abstract:
According to a precise critical temperature indicator and a control method thereof of the present invention, the precise critical temperature indicator comprises as one body: a blocking boundary layer which is positioned between a spreading material member including an operation button and spreading medium members including a spreadable area for a spreading material; and a temperature sensor which is controlled and operated as the spreading material passes through the blocking boundary layer and contacts the spreading medium member according to a user&#39;s pressing of the operation button. As a result, operation of the temperature sensor is easily controlled using the operation button.

Full Description:
CROSS REFERENCE TO RELATED APPLICATION 
     This is a 35 U.S.C. §371 application of, and claims priority to, International Application No. PCT/KR2009/007774, which was filed on Dec. 24, 2009, and which claims priority to Korean Patent Application No. 10-2008-0133228, which was filed on Dec. 24, 2008, and to Korean Patent Application No. 10-2009-0129853, which was filed on Dec. 23, 2009, the teachings of each application is incorporated herein by reference. 
     TECHNICAL FIELD 
     The present invention relates to a critical temperature indicator, in particular to a precise critical temperature indicator comprising an activation button filling up a development material therein, a development material member forming a migration passage of the development material and a development medium member forming a development portion of the development material with being coupled to the development material member in the non-contact state to enable the convenient operation control of a temperature sensor by the activation button and the confirmation of the exact temperature sensing indication, and a manufacturing method therefor. 
     BACKGROUND TECHNOLOGY 
     There has been a critical temperature indicator of a typical prior art that can be obtained as a commercial name “Monitor Mark” of 3M. 
     As shown in  FIG. 1 , the critical temperature indicator  10  includes an indicating material or development material layer  11  to reacted or diffused at or above a predetermined temperature and a wicking member or a development medium layer  12  absorbing a solvent from the development material layer  11 . The development material layer  11  is a temperature sensor layer mixed with ink and fatty acid or paraffin, and the development medium layer  12  is made of absorbing papers, non-woven fibers, etc. A barrier or isolation layer  13  is placed between the development material layer  11  and the development medium layer  12 . A first major sheet or supporting layer  14  and an opposing second major sheet or both sided-adhesive tape  15  are in turn arranged on the lower portion of the development material layer  11 . An indicating layer  16  includes indication windows to be arranged on the development medium layer  12 , in which the indication windows includes larger indicating windows  16 ′ and smaller indication windows  16 ″ formed in a longitudinal direction thereon. A transparent coating layer  17  is positioned on the right of the indication layer  16 . 
     On the other hand, the development medium layer  12 , the indication layer  16  and the transparent layer  17  are provided with cutting portions  18  having the same size, respectively, on the same position of their one side. The temperature indicator  10  further includes a supporting layer  14  attached to the both sided-adhesive tape  15 , on which the development material layer  11  and the development medium layer  12  are arranged on the supporting layer  14  with the isolation layer  13  positioned there between. An indication layer  16  is placed on a separation layer  13  with indication windows  16 ′ and  16 ″ being positioned on the development medium layer  12 . Then, the transparent layer  17  is positioned on the indication layer  16  to finish the assembly of the temperature indicator  10 . 
     Therefore, the temperature indicator  10  is attached to a predetermined position of a refrigeration product through the adhesive portion of the both sided-adhesive tape  15 , the cutting portion  18  is removed there from and the isolation layer  13  is drawn out between the development material layer  11  and the development medium layer  12  to be closely contacted with each other. Thereafter, the temperature indicator  10  begins to operate as the development material  11  including a fluid of fat or paraffin with a pigment ink is melted, infiltrated into the development medium layer  12  and immigrated along the lengthwise thereof to indicate the storage state of the products through the indication windows  16 ′ and  16 ″. 
     But the temperature indicator has disadvantages in that the resultant product size is relatively bigger due to the migration of the development material in a longitudinal direction, requires a larger power of attention for removing the cutting layer between the development material layer and the development medium and layer. It is difficult to automate the manufacturing of the product. Since the development material is stored in a state exposed to the air atmosphere without being sealed, it must be refrigerated or cooled for over one to two hours below a melting point thereof before being used. If it is carelessly used and melted at the state exposed to a normal temperature, some fluid of the development material adheres to the isolation layer when the isolation layer is removed. Particularly, the development material is slowly migrated as being gradually far away from the starting point. For it, such like strip type of the temperature indicator has a disadvantage in that an error ranges of the temperature indication time is relatively greater. 
     Another typical prior art of U.S. Pat. No. 7,232,253 (US Unexamined Publication No. 2004/0240324 published on Dec. 2, 2004) discloses “A time indicator and method of manufacturing same”. The time indicator comprises a first reservoir, a migration medium and activating means for bringing liquid from the first reservoir in contact with the migration medium so that after activation the liquid migrates through the migration medium producing a color change therein. The activating means comprises a second reservoir connected between the first reservoir and the migration medium whereby after activation the liquid travels relatively rapidly from the first reservoir to the second reservoir and then migrates relatively slowly along the length of the migration medium over time. 
     The patent has some characteristics in that it can make a visible indication of the product life span, but the development material liquefied is migrated to a liquid conduit and then activated in a longitudinal direction with being contacted with the migration medium, so it is resulted in forming the dual paths. It means that it is difficult to measure the exact time elapse. Furthermore, as a weak seal is provided to block the liquid conduit, the activation means of a dish shape portion including a first storing portion must be broken out by a certain force for the operating of a system. However, the weak seal has been often used to be ruptured due to the carelessness of users in operation to draw out the liquid outside therefrom. For it, the time indicator makes the confirmation of the exposed time to a cooling environment become difficult. 
     Considering these and those points, it is preferable if a critical temperature indicator has an operative mechanism to enable the confirmation of the administration situation from the delivery to the changing of products 
     Also, it is preferable if it is convenient to use a critical temperature indicator and the critical temperature indicator is easily adapted to a small freeze or refrigerating product and has a simple configuration to enable the mass-production thereof. 
     DETAILED DESCRIPTION OF THE INVENTION 
     Technical Problem 
     Considering these points, a main object of the invention is to provide a precise critical temperature indicator made into one body to enable the contact between an upper development material member and lower development medium member to be arbitrarily controlled, and manufacturing method therefor. 
     Another object of the invention is to provide a precise critical temperature indicator made into one body comprising an activation button filling up a development material therein and a development material member forming a migration passage of the development material in dual to enable the confirmation of the exact temperature sensing indication, and manufacturing method therefor. 
     Another object of the invention is to provide a precise critical temperature indicator for enabling the contact of an activation button filling up a development material therein with a development medium member formed at a separated state there from to be arbitrarily controlled and manufacturing method therefor. 
     Another object of the invention is to provide a precise critical temperature indicator having a configuration to simply separate a development material member and a development medium member from each other to establish the automatic mass-production thereof and the distribution and storage at a normal temperature thereby enabling the convenient handling thereof, and manufacturing method therefor. 
     Means for Resolving Problems 
     According to one embodiment of the invention, a precise critical temperature indicator comprises a development material member including an activation button filling up a development material and constituted as a molding layer projected at the center, an extension portion horizontally extended from the activation button and forming a migration passage of the development material on the diameter line thereof, a first compartment bordering at a concentric circle with the activation button on the extension portion and applying an adhesive agent to the outer circumference thereof, a second compartment projecting in a concentric circle adjacent to the circumference of the first compartment to form a predetermined space therein and an upper portion extended from the circumference of the second compartment and forming at least one indicating window; a development medium member positioned on the lower surface of the upper portion and including a migration passage of the development material formed in a region of any one of a concentric circle, a threaded form or a zigzag form; and a lower portion including a seat for sealing the upper portion adjacent to the development medium member. 
     A manufacturing method of the precise critical temperature indicator comprises steps of preparing an upper sheet comprising a plurality of development material members including an activation button formed in a predetermined semi-hemisphere on a single sheet and forming first and second compartments and a passage; filling up a development material into the activation button, the first compartment and the passage; overlapping a lower sheet including a plurality of development medium members on another single sheet and combining them; and applying a synthetic ink such as a polyester ink, etc. to a predetermined shape of first and second print layers to form a development material contacting portion and a development material mitigation passage. 
     According to another embodiment of the invention, a precise critical temperature indicator comprises a temperature sensor including an upper portion made of a transparent material, in which the upper portion includes a container sealed by a seal member to receive a development material therein, a support portion supporting the container, first and second cylindrical portions formed in layers of concentric circle having diameters different from each other, a first cylindrical portion including a circular plate formed away in a certain gap from the circumference thereof, a second cylindrical portion receiving the container therein and a lower portion including a development medium member for arranging the support portion on a seat portion under the lower surface of the upper portion and sealing the lower surface thereof adjacent to the development medium member and applying an adhesive agent thereto to be attached to freezing and refrigerating products; an indication portion made of an opaque material and including at least one indication windows formed on the cylindrical portion of the upper portion; and a cap portion made of an opaque material and sealing the lower surface thereof, in which the activation button is fitted into the center hole thereof and the temperature sensor is received therein. 
     The temperature sensor furthermore includes the support portion positioned on around the circular seat portion of the development medium member and an extension portion extended in a circle or multi-angle forms from the seat portion, to the upper and lower surfaces of which a predetermined pigment is applied. 
     According to another embodiment of the invention, a precise critical temperature indicator comprises a development material member including an activation button filling up a development material therein and constituted as a molding layer projected in a semi-sphere at the center and a plurality of indication windows formed in an arc on the circumference of the activation button; and a development medium member including a boundary layer positioned between the development material member and the development medium member and for forming a speed adjustment window and an migration passage connected to the speed adjustment window of the development of the development material, in which the development material is introduced into and filled in the speed adjustment window by the activation button, and migrated along a migration passage of the development medium member coupled with both sides thereof, thereby indicating a critical temperature detection through a plurality of indication windows formed on the predetermined positions of the development material member. 
     An adhesive agent is not applied to regions corresponding to the activation button and the speed adjustment window on an adhesive agent layer between the development material member and the boundary layer. The development medium member made of a micro porous film is heat-pressed in the form of a circle ring with a region formed by overlapping the migration passage of the development material with the speed adjustment window and an indication portion region formed adjacent to the migration passage on the diameter line of the speed adjustment window. 
     The precise critical temperature indicator furthermore comprises a print layer printing regions corresponding to the speed adjustment window, and the indication windows of the indication portion are printed by a red color, both sides on the red color of the indication window are printed by a yellow color, and other region is printed by a blue color thereby to let the operating start time point and the exposure time point of the critical temperature to be indicated. 
     According to another embodiment of the invention, a manufacturing method of a precise critical temperature indicator comprises steps of firstly, preparing a seal sheet made of a silver film and including a plurality of base layers, a print sheet member for the temperature indication, a development medium member sheet made of a micro porous film and including a plurality of development medium members forming the development passage and an intermediate member sheet including a plurality of boundary layers to form the speed adjustment windows, respectively; heat-depositing these sheets by the reference of the heat-adhesion portion forming the development passage to combine them in a single sheet; applying an adhesive agent to all portions of the combined sheet except for an inner circle portion of the development passage of the development material on a plurality of intermediate members and indication windows; and heat-depositing on the adhesive layer a sheet including a plurality of development material members having a molding layer in the form of a semi-sphere to receive the development material. 
     According to another embodiment of the invention, a precise critical temperature indicator comprises a development material member including an activation button made into a molding layer to be projected in a semi-sphere from the center thereof and for receiving a development material, an migration passage horizontally extended in a predetermined distance from the activation button of the molding layer, a buffer portion connected to the migration passage and made into a compartment to receive the development material, temporally, and absorb shock due to the pressing force of the activation button and a plurality of indication windows formed in an arc on the circumference of the activation button; a boundary layer including a speed adjustment window connected to the migration passage and for introduce the development material into the speed adjustment window; a development medium member made of a micro porous film and for forming a region except for the development passage extended from the migration passage into a heat-adhesion portion; a print layer printing regions corresponding to the speed adjustment window and the indication window of the indication portion are printed by a red color, both sides on the red color of the indication window by a yellow color, and other region by a blue color; a base layer positioned on the bottom of a system, thereby letting the operating start time point and the exposure time point of the critical temperature to be indicated on the indication windows on the top of the system. 
     The development material member includes the indication window formed in the form of a circle or a square, etc. on the circumference of the activation button, a development passage having a shape the same as that of the indication window horizontally extended toward an outlet at the center from the activation button to let the development material to be flowed there into and a buffer portions including at least one compartments connected to the development passage to receive the development material, first, and absorb some shock due to the pressing force of the activation button. 
     According to another embodiment of the invention, a manufacturing method of a precise critical temperature indicator comprises steps of preparing a seal sheet including a plurality of base layers made of a silver foil, a print member sheet including a plurality of print members for a temperature indication, a development medium sheet including a plurality of development medium members forming development passages made of a micro porous film, an intermediate member sheet including a plurality of boundary layers forming a speed adjustment window, respectively; heat-depositing these sheets by the reference of heat-deposition portions forming the development passages of the development material to be combined in a single sheet; applying an adhesive agent to all portions except for the inner circle portion of the development passages and indication windows on a plurality of boundary layers of the combined sheet; and heat-depositing on the adhesive layer a sheet including a plurality of development material members and constituted as a molding layer in a semi-sphere to receive the development material at the center thereof, a migration passage horizontally extended in a predetermined distance from the activation button of the molding layer, a buffer portion connected to the migration passage and made into a compartment to receive the development material, temporally, and absorb shock due to the pressing force of the activation button and a plurality of indication windows formed in an arc on the circumference of the activation button. 
     Effect of the Invention 
     According to the invention, a precise critical temperature indicator can be stored with a development material member and a development medium being separated from each other in a normal state and introduce the development material into a development passage or a buffer portion to buffer some shock in order to control a force applied to a development material in use and does not require for cooling it below a critical temperature before use. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is an exploded perspective view illustrating an example of a prior art in detail; 
         FIGS. 2 and 3  are respectively a perspective view and an exploded perspective view illustrating a temperature and the assembly thereof according to one embodiment of the invention; 
         FIGS. 4 and 5  are perspective views illustrating a temperature sensor and a precise critical temperature indicator including a fixing portion thereto according to one embodiment of the invention; 
         FIGS. 6 and 7  are perspective views illustrating a precise critical temperature indicator including a temperature sensor, a cap portion and a lower structure mounted thereto and the operation thereof according to one embodiment of the invention; 
         FIG. 8  is a cross-sectional view illustrating a precise critical temperature indicator adapted to a cover of a medicine bottles such as a vial; 
         FIGS. 9 ,  10  and  11  are respectively a schematic perspective view and exploded perspective views illustrating the assembly of a precise critical temperature indicator according to another embodiment of the invention; 
         FIGS. 12 and 13  are respectively perspective views illustrating the assembly of a precise critical temperature indicator and the inner structure thereof cut in part and the operation state thereof as an activation button is pressed in use according to another embodiment of the invention; 
         FIGS. 14 ,  15  and  16  are respectively perspective views illustrating the operations of a precise critical temperature indicator with the shapes of indication windows being different from each other according to another embodiment of the invention; 
         FIG. 17  is a view illustrating a method of manufacturing a larger amount of a precise critical temperature indicator, automatically, according to another embodiment of the invention; 
         FIG. 18  is a perspective view illustrating a precise critical temperature indicator in detail according to another embodiment of the invention; 
         FIG. 19  is a series of cross-sectional views illustrating parts of a precise critical temperature indicator, respectively, according to another embodiment of the invention; 
         FIG. 20  is a series of cross-sectional views illustrating the assembly of a precise critical temperature indicator and the operation state thereof in use according to another embodiment of the invention; 
         FIG. 21  is a whole perspective view illustrating a precise critical temperature indicator in detail according to another embodiment of the invention; 
         FIG. 22  is a side cross-sectional view illustrating a precise critical temperature indicator in detail according to another embodiment of the invention; and, 
         FIG. 23  is a side cross-sectional view illustrating a precise critical temperature indicator in detail according to another embodiment of the invention. 
     
    
    
     BEST MODE FOR CARRYING OUT INVENTION 
     The invention will be explained in detail with reference to the attached drawings as follows: 
     According to one embodiment of the invention, a precise critical temperature indicator  20  is made into one body as shown  FIG. 2  and comprises an upper portion  21  and a lower portion  33  made of a transparent PTP or a vinyl coating film forming a case as shown in  FIG. 3 . Herein, the PTP is generally used in packing medical supplies in the form of a tablet or a jelly and an abbreviation of Press Through Pack called “Blister Pack”. 
     The upper portion  21  includes a first cylindrical portion  24  and a second cylindrical portion  25  integrally stratified in a concentric circle having two diameters different from each other, in which the first cylindrical portion  24  includes a first circle plate  22  formed away in a predetermined gap  23  except for a first connection portion  26  from the circumference thereof A lower portion  33  also is made by PTP or Vinyl film and formed in the same shape as that of the plane view of the upper portion  21 . 
     The lower portion  33  includes a center portion  35  having an area similar or equal to that of the first cylindrical portion  24 , a second circle plate  36  identical to the first circle plate  22  away in a second gap  34  from the circumference of the center portion  35  and a second connection portion  37  corresponding to the first connection portion  26 . Herein, the first gap  23  and the second gap  34  let a projection portion  72  of a cap portion  71  to be passed there through as described in detail later with reference to  FIG. 8 . 
     There is a temperature sensing portion  40  arranged between the upper portion  21  and the lower portion  33 . The temperature sensing portion  40  includes a container  41  of a material such as PTP positioned in the second cylindrical portion  25 . The container  41  receives a development material  42  such as fat acid ester or silicon oil to be melted over a critical temperature and is sealed at the lower portion by a seal member  43 . The seal member  43  is made of fragile materials such as a silver foil to be broken down, as the development material member  130  is moved downward by pressing the second cylindrical portion  25  or an activation button  55  as described later. 
     A development medium  47  is positioned adjacent to the lower portion  33  under the container  41  and made of an absorbing paper or a non-woven fiber. A seat portion  46  is formed at the center to position the development material  42 . An extension portion  45  is extended in a concentric circle or threaded form to secure a predetermined length from one side of the seat portion  46 . The extension portion  45  may be a circle or polygonal form. Also, in the extension portion  45  of the development medium  47  a dyestuff or pigment is attached to the upper or lower portion thereof As the development material  42  is migrated along the extension portion  45 , the dyestuff is dissolved to dye the development medium  47 . 
     Before the operating of the temperature sensing portion  40 , the support portion  44  is positioned around the seat portion  46  of the development medium  47  to support the container  41  together with the sealing member  43 . 
     Such like temperature sensing portion  40  includes a first indication portion  51  of an opaque material with indication windows  53 ,  63  and  73  formed on the upper and a cap portion  61  or  71 , a fixing portion  52  including the lower surface and a lower structure  62  or a container cover  76  to function as an independent precise critical temperature indicator. 
     Therefore, the temperature sensor can be used, separately or variably, according to a use place and object as it will be known in embodiments below. 
     As shown in  FIGS. 4 and 5 , according to other embodiment of the invention, a precise critical temperature indicator  50  is assembled into one body. The precise critical temperature indicator  50  includes a first indication portion  51  made of an opaque material on the upper surface of a temperature sensor  20 , a fixing portion  52  formed as a both-sided tape to both surfaces of which an adhesive is applied and a temperature sensor  20  positioned therebetween. The first indication portion  51  includes at least one first indication windows  53  formed on the circumference thereof The first indication portion  51  may be printed by an opaque paint on the first circle plate  22  of the temperature sensor  20  in order to form the first indication window  53  without constructing as a separate structure. 
     The precise critical temperature indicator  50  is operated in a manner to press the second cylindrical portion  25  downward and then insert the development material  42  into the center hollow of the support portion  44  in the state of attaching to a freezing or refrigerating product thereby to activate the temperature sensor  20 . At that time, the seal member  43  is broken down, and the development material  42  is positioned on the seat portion  46  of the development medium  47 . In this state, the development material  42  is melted at over a critical temperature, the melted liquid of which is developed or migrated on the extension portion  45  of the development medium  47 . And then, the dyestuff applied to the lower and upper portions of the development medium  47  is dissolved migrated or revealed along the development medium  47 . The revealed position is moved according to the time elapse at over the critical temperature. As a predetermined time is elapsed, the revealed color appears on the first indication window  53  to judge the current state of a stored product. 
     Also, according to another embodiment of the invention, as shown in  FIGS. 6 and 7 , a precise critical temperature indicator  60  comprises a temperature sensor  20 , and the temperature sensor  20  is assembled into a cap portion  61  and a lower structure  62  made of a rigid plastic. 
     The cap portion  61  made of an opaque rigid material includes an activation button  55  fitted into a center hole  64  on the upper portion thereof, under the lower portion of which a temperature sensor  20  is positioned. The activation button  55  includes a flange  56  formed on the lower portion thereof, which is positioned on a second cylindrical portion  25  while on the inner surface of the cap portion  61  to be exposed through the center hole  64  in the assembly thereof. The cap portion  61  is opened at the lower portion to let the temperature sensor  20  to be assembled therein and the lower structure  62  to be mounted on the lower surface thereof. The second indication window  63  is formed on a predetermined position of the upper surface of the cap portion  61 . 
     The precise critical temperature indicator  60  has a configuration equal to that of another embodiment of the precise critical temperature indicator  50  except for the portions as described above. 
     According to another embodiment of the invention, as shown in  FIG. 8 , a precise critical temperature indicator  70  includes a precise critical temperature sensor  20  adaptable to a container cover  76  such as an injection medicine bottle or a medicine vial, etc. 
     In other words, the cap portion  71  includes projections  72  extended from the fixing position around the circumference of a cylindrical portion at the center portion thereof. The projections  72  are projected into cover holes  75  formed on a container cover  76  and then bent in any direction of left and right sides to combine the cap portion  71  and the container cover  76  with each other. A third indication window  73  is formed at a predetermined position on the upper surface of the cap portion  71 . A hole  74  is formed on a thickness portion of the cap portion  71  to fit the activation button  55  there into. 
     A whole configuration excluding from parts described above is similar or equal to that of the precise critical temperature indicator  70 , the detailed description of which is deleted. 
     According to another embodiment of the invention, as shown in  FIGS. 9 and 10 , a precise critical temperature indicator  20  comprises a development material member  130  including an upper portion made of a transparent PTP or a vinyl coating film for forming a case and a development medium member  150  including a lower portion that a development material is migrated. 
     The development material member  130  comprises an activation button  131  including a cap portion like a similar sphere or semi-sphere in the form of a dome, a first compartment  132  formed to position in concentric circles of two different diameternes spaced away from the activation button  131 , passages  135  connected from the activation button  131  to a second compartment  133 , the second compartment  133  and an indication window  136  formed away in a distance from the circumference of the second compartment  136 . A development material  140  is filled up in the activation button  131 , the passages  135  and the first compartment  132 . An extension portion  137  is referred to a portion formed except for passages  135  between the activation button  131  and the first compartment  132 , which is adhered to a development medium  151  of a development medium member  150  using a heat, an ultrasonic wave or a bond, etc. 
     The development medium member  150  includes the development medium  151  and a base portion  152  coupled to the development material member  130  adjacent thereto and for protecting the development medium  151 . The development medium  151  is formed to contact to the activation button  131 , the first compartment  132  and a first development material contact portion  155  including a passage as described below. A first print layer  154  defines a boundary portion between the first and second compartments  132  and  133  adjacent to the circumference of the first development material contact portion  15 , and the boundary portion applying adhesives is coupled with the first and second compartments  132  and  133  according to a method as described below. Furthermore, the second development material contact portion  153  includes development material migration passages  156  formed in at least one concentric circle in a predetermined form by a second print layer  157  as shown in  FIGS. 9 and 11 . The second print layer  157  is coupled with the outer circumference of the second compartment  133  on the inner side and the lower portion of the development material member  130  on the outer side. 
     Herein, the first and second print layers  154  and  157  are formed using Polyester ink, Silicon ink, Urethane ink, PVC ink, Nylon ink, Epoxy ink, etc. Also, instead of the first and second print layers  154  and  157 , a silica coated sheet or a filter paper is usable cutting in a predetermined form with a forming knife. The development material may be fat acid oil or paraffin and silicon oils that fat-solubility pigments are dissolved. 
     As shown in  FIGS. 12 and 13 , a precise critical temperature indicator  120  comprises a development material member  130  and a development medium member  150  coupled to each other. The development material member  130  includes an activation button  131  and a migration passage  135  and a first compartment  132  filled up with a development material  140 , in which a boundary portion between the first compartment  132  and a second compartment  133  is adhered to a first print layer  154 , and the second compartment  133  is hollow. The circumference of the second compartment  133  is adhered to the second print layer  157 . Besides, all portions of the development material member  130 , an extension portion  137  and a circumferential portion  134  extended from the second compartment  133  are adhered to each another using a heat, an ultrasonic wave or a bond, etc. 
     Herein, it is noted that a temperature sensor includes the first and second compartments  132  and  133  isolating the development material  140  from the development medium  151  only for a moment and the development medium migration passage  156  formed by the first and second print layers  154  and  157  on the development medium  151 . 
     The precise critical temperature indicator including such like this temperature sensor is operated as the activation button  131  is first pressed, and the adhesion of the boundary portions between the first print layer  154  and the first and second compartments  132  and  133  is released. The development material  140  is migrated to the second compartment  133  to be filled up there into and thereafter along the development medium migration passage  156  to let the indication window  136  to appear at a predetermined color after a predetermined time elapse as shown in  FIG. 14 . The indication window  136  may be numerously formed along the development medium migration passage  156  in an arc on the circumferential portion  134  to enable the migration of the development material  140  to be confirmed as shown in  FIG. 15 . As shown in  FIG. 16 , a plurality of the indication windows  136  are formed away in a distance from each other along the development medium migration passage  156  in an arc on the circumferential portion  134  to enable the migration of the development material  140  to be confirmed. 
     As shown in  FIG. 17 , according to another embodiment of the invention, a precise critical temperature indicator is manufactured as follows: firstly, a sheet having a plurality of development material member  130  using a single sheet made of materials such as a blister, etc. is prepared. A development material  140  is filled up into an activation button, a first compartment and a passage on the development material member  130 . Another sheet is coupled with the development material member  130  overlapping to each other. First and second print layers are printed using a synthetic ink such as a polyester ink, etc. to form a development material contact portion and a development material migration passage. And, on the development material member  130  a development medium member  150  is positioned and integrally coupled with each other using a heat, an ultrasonic wave or adhesive. Thereafter, such like a mass manufactured precise critical temperature indicators at once are separated one by one to complete one product. 
     As shown in  FIGS. 18 and 19 , according to another embodiment of the invention, a precise critical temperature indicator is made into one body including a development material member  230  positioned on the upper portion thereof The development material member  230  made of PE and PVC comprises an activation button  232  including a molding layer A that is projected in a semi-sphere form at the center to receive a development material  231  therein and a plurality of indication windows formed in an arc around the circumference of the activation button  232  including left indication windows  233  formed in a certain gap leftward and right indication windows  234  formed in a certain space rightward so as to enable the temperature indication to be developed in both directions. 
     An adhesive member  240  of an adhesive layer B to adhere an intermediate member including a boundary layer C as described thereafter thereto is applied to the lower portion of the development material member  230 . The adhesive member  240  includes a space not applying adhesives to regions corresponding to the activation button  232  and a speed adjustment window  251  to function as a migration passage  241  of a development medium. 
     The intermediate member is positioned between the development material member  230  and the development medium member  250  and formed as a migration passage, on the corner of which the speed adjustment window  251  is formed. 
     The development medium member  250  made of a micro porous film includes a development passage  261  in a ring shape connected to the speed adjustment window  251 , and a final development region  262  terminated at the development passage  261  opposite to the speed adjustment window  251  in a diameter line is divided. The development medium member  250  is heat-pressed together with the development material member  230  with the development material  231  filled up in the activation button  232 . 
     The precise critical temperature indicator further comprises a print member  270 . The print member  270  includes a region corresponding to the speed adjustment window  251  printed by a red color, the development passage  261  including an indication region of the left and right indication windows  233  and  234  by a blue color, both sides of the indication window  235  at the final development region by a yellow color and an indication window of the final development region  262  by a red color. The print member  270  may be formed on another layer or a sealing member  280  including a base layer F. 
     The development material member  230  is made of transparent PTP or vinyl coating film, and the intermediate member is made of PE, PP, and Polyolefin or aluminum material. 
     As shown in  FIG. 20 , the precise critical temperature indicator is standing by ready to operate with being attached to freezing or refrigerating products ( 1 ). As the activation button  232  is pressed, the development material  231  is migrated along the migration passage  241  and through the speed adjustment window  251  to the indication window  238  to show the beginning of a system&#39;s operation ( 2 ). Thereafter, the development material  231  is applied to both ends of the development passage  261  and migrated in both directions to start the development thereof ( 3 ). The development material  231  continues to be developed according to a time elapse to get the left and right indication windows  233  and  234  to appear in the blue color ( 3 ) and ( 4 ). In the process of the continuing development, the indication windows  236  and  237  appear in the yellow color to warn users ( 5 ) and are further advanced to appear in the red color and indicates that the freezing or refrigerating products are in the danger range. It means that the precise critical temperature indicator enable the temperature indication from the beginning step to the final step. 
     A manufacturing method of the precise critical temperature indicator comprises steps of: firstly, preparing a seal sheet including a plurality of seal members, a print sheet member including a plurality of print members  270 , a development medium sheet made of a micro porous film and including a plurality of development medium members to form the development passage  261  and an intermediate member sheet including a plurality of boundary layers to form the speed adjustment windows  251 , respectively; heat-depositing these sheets by the reference of the heat-adhesion portion to form the development passage  261  and to combine them in a single sheet; applying an adhesive agent to all portions of the combined sheet except for an inner circle portion and indication windows of the development passage  261  of the development material  231  on a plurality of intermediate members  250 ; and heat-depositing a sheet including a plurality of the development material members  230  having a molding layer in the form of a semi-sphere to receive the development material  231  on the adhesive layer. 
     According to another embodiment of the invention, as shown in  FIGS. 21 and 22 , a precise critical temperature indicator  20  is made into one body. The precise critical temperature indicator  20  is similar to the first embodiment except for a development material member  230 , the detailed description of which is deleted herein. The development material member  230  will be explained on priority basis. The development material member  230  includes an activation button  232  filling up a development material  231  therein and having a molding layer projected in a semi-sphere form at the center thereof and a plurality of indication windows including left indication windows  233  spaced in a certain gap leftward there from and a warning indication window  237 , right indication windows  234  spaced in a certain gap rightward there from and other warning indication window  236  and a danger indication window  235  to enable the temperature indication to be developed in both directions. The activation button  232  includes a migration passage  231   a  formed adjacent thereto and extended horizontally in a predetermined distance there from to enable the flow of a development material and a buffer portion  239  to be connected to the migration passage  231   a  and constituted as a compartment to receive the development material  231 , temporally, and absorb shock due to the pressing force of the activation button  232 . 
     On the other hand, it is desirable that the activation button  232  may receive the development material  231  mixed with an ink adding a fat-solubility pigment therein. 
     Therefore, as shown in  FIG. 23 , the development material member  230  enables the development material  231  to pass through the migration passage  231   a  to the buffer portion  239  including a hollow compartment, first, as the activation button  232  is pressed. At that time, the buffer portion  239  absorbs some shock due to the pressing pressure. Herein, the migration passage  231   a  includes a weak portion having a relative small contact region between the activation button  232  and the buffer portion  239 . 
     A manufacturing method of a precise critical temperature indicator according to another embodiment of the invention comprises steps of preparing a seal sheet including a plurality of seal members  280 , a print member sheet including a plurality of print members  270  for the temperature indication, a development medium sheet including a plurality of development medium members forming development passages  261  made of a micro porous film, an intermediate member sheet including a plurality of boundary layers C forming a speed adjustment window  251 , respectively, combining these sheets in single sheet heat-depositing by the reference of heat-deposition portions forming the development passages  261  of the development material  231 , applying adhesive agent to all over portions except for the inner circle portion of the development passages  261  and indication windows on a plurality of intermediate members and heat-depositing a sheet including a plurality of development material members forming a molding layer in a semi-sphere to receive the development material  231 .

Technology Classification (CPC): 6