to further disclose the technical characteristics of the invention , please refer to the figs . the primary objective of the present invention is to provide a thermo chromic heat storing / releasing device that comprises a bag 1 , a heat storing / releasing material 2 contained in the bag 1 , a thermo chromic material 3 , and / or a starter 4 . in the present invention , a bag 1 is made of a polymer material and preferably transparent but not limited to such . basically , the bag 1 can be used repeatedly , and thus it is better to select a durable and flexible material with a certain specific thickness , so that the edges of the finished goods of the bag 1 can be sealed by high frequency or other equivalent measures . however , the sealing is a prior art and will not be described here . unlike the prior art , the present invention achieves the thermo chromic effect by mixing a thermo chromic material 3 in the foregoing heat storing / releasing device , and the thermo chromic material 3 is a chemical dye which will fade when heated . in other words , the color of the thermo chromic material 3 changes as the temperature rises or drops , and the temperature for changing the color is predetermined . for example , the color of the thermo chromic material 3 changes color at a high temperature and resumes its original color at a low temperature . the thermo chromo material 3 of this sort is made by local and foreign manufacturers , wherein the “ thermochromic capsule powder ” produced by local manufactures is composed of a “ fluoran leuco dye plus polymer melanine / formaldehyde for capsule ”, and thus it could be in various different colors and the range of its temperature is set from − 15 ° c . to 70 ° c . according to the user &# 39 ; s requirements . the preferred embodiment of the invention adopts but not limited to such thermo chromic material 3 . the thermo chromic material 3 could be single colored , double colored or multi - colored . for the single colored thermo chromic material 3 , if the thermo chromic material 3 is blue in color , then the color of the heat storing / releasing device is blue at regular room temperature . however , after it is heated , the thermo chromic material 3 is changed to colorless . therefore , when the heat is released , the heat storing / releasing device shows a light color such as a light blue color or even colorless . however , when the temperature drops to a predetermined normal temperature , the heat storing / releasing device resumes the blue color . such setting also can apply to other colors including black . as to the event of two mixed colors such as yellow and blue , the two colors are combined to produce a green color according to the chromatology . if yellow is set as the faded color , the yellow color will fade and turn into a blue color when releasing the heat ( or the temperature rises ). after the heat is released , the yellow color is resumed and the overall color is turned into green to constitute a “ blue outside and green inside ” phenomenon . therefore , one or more color can be used for the event of mixed colors according to the temperature . the proportion of the mixed colors depends on the requirements of the change of color . basically , the more the thermo chromic material , the larger is the change . for the case of a single color , the proportion should be not less than 5 % of the total weight ; for the case of a multiple of colors , the total weight of the thermo chromic material 3 should not be less than 5 % after the colors are mixed . if a saturated sodium acetate solution is used , the heat is not released , or the temperature is not dropped naturally as the water solution does as described previously , then a starter 4 can be added . the starter 4 is a metal plate , which can be bent by an external force to produce a microwave to activate the heat storing / releasing material 2 to increase its temperature and release heat , and then drops its temperature . since it is a prior art , and thus will not described here . the technical measure of mixing the thermo chromic material 3 into a heat storing / releasing material 2 according to the present invention allows users to know about the current temperature of the heat storing / releasing device visually by the change of color . the present invention can be considered as a big breakthrough on the application of a heat storing / releasing device by providing a quick way of knowing about its temperature visually . besides mixing the thermo chromic material 3 into a heat storing / releasing material 2 , the change of the thermo chromic material 3 can be applied simply on the printed layer 5 of the bag 1 of the heat storing / releasing device 2 . in other words , if the printing material is mixed with the thermo chromic material 3 and printed onto the inner surface or the outer surface of the bag 1 , then it can achieve the effect of changing colors in correspondence with the change of temperature , and includes the change of a single color , two colors or several colors . the printing is printed on the whole surface with decorative text and / or graphic patterns . however , the printing skill is a prior art , and thus will not be described here . further , please refer to fig3 for the heat storing / releasing device of the present invention . a cover 6 made of a material including polymer , woven cloth , unwoven cloth or knitted bag is added to accommodate the heat storing / releasing device and constitute a covered printed layer 61 comprised of a thermo chromic material mixed with a printed material . therefore , even if the heat storing / releasing device is placed into the cover 6 , the covered printed layer 61 can still achieve the visual thermo chromic effect . therefore , the heat storing / releasing device can achieve the effect of sensing the change of temperature according to the foregoing two embodiments and be set into a single section or two or more sections for the change of temperature . besides providing the thermo chromic effect by the change of color , the heat storing / releasing device also has several colors for the visual effect , and thus providing diversified choices for users . if other fillers or additives such as fluorescent powders are mixed , the cost can be lowered . while the invention has been described by way of example and in terms of a preferred embodiment , it is to be understood that the invention is not limited thereto . to the contrary , it is intended to cover various modifications and similar arrangements and procedures , and the scope of the appended claims therefore should be accorded the broadest interpretation so as to encompass all such modifications and similar arrangements .
a thermal chromic heat storing / releasing device includes a bag having an enclosed space for containing a heat storing / releasing material , and the heat storing / releasing material is a material that can store and release heat and the heat storing / releasing material is contained in the bag . a thermal chromic printed layer having at least a part disposed on the bag , and the printed material is mixed with a thermal chromic dye , such that the thermo chromic material will change the color of the printed layer for a visual indication as the temperature rises or drops .