TWI579542B - Temperature sensing device and method of using the same - Google Patents

Description

Temperature sensing device and method of use thereof

The present invention relates to a temperature sensing device, and more particularly to a temperature sensing device for sensing whether an item stored in a specific temperature range has a predetermined critical temperature.

In the field of logistics, especially in the process of transporting frozen fresh food, temperature control is very important. If the temperature of the food in any part exceeds the specified range, the food will deteriorate or even spoil, and finally reach the consumer. It will cause damage to human health when consumed. Therefore, how to ensure that frozen foods are kept within the specified specific temperature range during transportation, and that consumers can be sure that frozen foods are frozen all the time, will be an important issue.

The existing method can adopt an electronic temperature monitoring system, however, the instrument cost is high, and power consumption is also required, so there is room for improvement.

Accordingly, it is an object of the present invention to provide a temperature sensing device which is inexpensive to manufacture and simple in construction.

Accordingly, it is another object of the present invention to provide a method of using a temperature sensing device that is inexpensive to manufacture and simple in construction.

The temperature sensing device of the present invention comprises a substrate having a surface and a first accommodating groove formed by the surface recessed, the first accommodating groove accommodating a first liquid, and the first liquid has a first freezing point The first liquid is converted from a liquid state to a solid state at the first freezing point; a first film is a waterproof material and has a first joint surface connected to the surface of the substrate, and a first joint opposite to the first joint a second joint surface of the surface, the first joint surface is for closing the first receiving groove; a second film is waterproof and peelably connected to the second joint surface of the first film, the first joint The second film has a bonding surface connected to the second bonding surface; and at least one warning unit is disposed on the bonding surface of the second film and corresponds to the first receiving groove position of the substrate, the first The first and second joint faces of the film may be pierced such that the first liquid in the first receiving groove can flow through the first film to the warning unit, and the warning unit includes A test paper that changes color upon contact with the first liquid.

In some embodiments, the warning unit further includes a flow guiding member corresponding to the first receiving groove position and connecting the test paper, the guiding member is configured to guide the first liquid to flow to the test paper.

In some embodiments, the flow guiding member is made of a water absorbing material and has a first end portion corresponding to the position of the first accommodating groove, and a second end portion opposite to the first end portion, the test paper Adhered to the second end.

In some embodiments, the surface of the substrate is further recessed to form a second accommodating groove separated from the first accommodating groove, the second accommodating groove accommodating a second liquid, and the second liquid has a first a second freezing point, the second liquid is converted from a liquid state to a solid state at the second freezing point, and the first bonding surface of the first film is used for closing the first accommodating groove and the second accommodating groove, the temperature sensing The device includes two warning units disposed on the bonding surface of the second film and respectively corresponding to the first receiving groove and the second receiving groove Correspondingly, the first and second joint faces of the first film may be pierced to make the first liquid and the second liquid in the first accommodating groove and the second accommodating groove The liquid can flow through the first film and flow to the corresponding test paper of the warning unit, and the test paper is discolored.

In some embodiments, each of the warning units further includes a flow guiding member corresponding to the first receiving groove and the second receiving groove, and the guiding members are respectively connected to the test papers and used for The first liquid and the second liquid are guided to flow to the corresponding test paper.

In some embodiments, each of the flow guiding members is a water absorbing material, wherein a flow guiding member has a first end portion corresponding to the first receiving groove position, and a first end portion opposite to the first end portion The second end portion has another first end portion corresponding to the position of the second receiving groove, and the test strips are respectively adhered to the second end portions.

In some embodiments, a paper sheet disposed on the bonding surface of the second film is further included for writing characters.

In some embodiments, the substrate, the first film, and the second film are transparent materials.

In some embodiments, the second freezing point of the second liquid is different from the first freezing point.

In some embodiments, the second freezing point is less than the first freezing point.

In some embodiments, the first liquid is water and the second liquid is saturated saline.

The method for using the temperature sensing device of the present invention comprises the steps of: providing a temperature sensing device, the temperature sensing device comprising a substrate, a first film attached to the substrate, and a peelable ground a second film attached to the first film and a warning unit, the substrate is recessed to form a receiving groove, the receiving groove is accommodated with a liquid, and the liquid has a freezing point, and the liquid changes from a liquid state to a freezing point at the freezing point Solid state; lowering the temperature sensing device and maintaining the temperature below the freezing point to convert the liquid into a solid state; tearing the second film away from the first film, and piercing the first film to accommodate the groove Reattaching the second film to the first film; and placing the temperature sensing device with an article, and gradually heating up when the temperature sensing device is exposed to room temperature, so that the temperature is higher than the temperature At the freezing point, the liquid changes from a solid state to a liquid state, thereby flowing through the first film and flowing to a test strip of the warning unit to discolor the test paper.

In some embodiments, the temperature sensing device further includes a paper sheet disposed on the second film, and after the step of tearing the second film away from the first film, the method further includes: signing the paper sheet A step of.

In some embodiments, the liquid is one of water and saline.

The present invention has at least the following effects: when the test paper of the warning unit is discolored when contacting the first liquid, the temperature sensing device is first cooled to a temperature lower than the first freezing point of the first liquid, so that the first The liquid solidifies into a solid state, and the second film is peeled off the first film and the first film is pierced to correspond to the first receiving groove, and finally the temperature sensing device is placed together with an object. So that the temperature of the article stored in the specific temperature range exceeds the temperature of the first freezing point of the first liquid, as long as the color of the test paper is discolored, and if the color change indicates that the temperature of the article has exceeded the first The temperature of the freezing point, thereby changing the first liquid from a solid state to a liquid state, and reacting with the test paper of the warning unit to discolor the test paper, so that the sensing can be stored in a specific temperature range. Whether the item has a function exceeding a predetermined critical temperature. Moreover, the temperature sensing device of the present invention is simple in construction and low in manufacturing cost.

1‧‧‧Substrate

11‧‧‧ surface

12‧‧‧First accommodating slot

13‧‧‧Second accommodating slot

2‧‧‧First film

21‧‧‧First joint

22‧‧‧Second joint

23‧‧‧ openings

3‧‧‧Second film

31‧‧‧Fitting surface

4‧‧‧Warning unit

41‧‧‧ deflector

411‧‧‧ first end

412‧‧‧ second end

42‧‧‧ test paper

5‧‧‧paper

L1‧‧‧First liquid

L2‧‧‧Second liquid

S1~S6‧‧‧Steps

Other features and advantages of the present invention will be apparent from the embodiments of the present invention. FIG. 1 is a perspective view of an embodiment of the temperature sensing device of the present invention; FIG. 2 is a perspective view of the embodiment. 3 is a schematic flow chart of a method of using the temperature sensing device of the present invention; FIG. 4 is a partial cross-sectional view of the temperature sensing device of the present invention; and FIG. 5 is a temperature sensing device of the present invention. A perspective view of this embodiment illustrates the discoloration of one of the test strips.

Referring to FIG. 1 and FIG. 2, an embodiment of the temperature sensing device of the present invention comprises a substrate 1, a first film 2, a second film 3, two warning units 4, and a paper sheet 5.

Referring to FIG. 1 and FIG. 2, the substrate 1 has a surface 11, a first receiving groove 12 formed by the surface 11 recessed, and a second receiving portion recessed by the surface 11 and separated from the first receiving groove 12. The first liquid L1 and the second liquid L2 respectively have a first freezing point and a second liquid L2, respectively. The first liquid L1 and the second liquid L2 respectively have a first freezing point and a second At the freezing point, the first liquid L1 and the second liquid L2 are converted from a liquid state to a solid state at the first freezing point and the second freezing point, respectively. In this reality In the embodiment, the substrate 1 is a transparent acrylic plate, the first liquid L1 is water, and the second liquid L2 is saturated brine, that is, the first freezing point is 0 ° C, and the second freezing point is about -20 ° C, but not This is limited, and the brine can be controlled by the concentration to control its solidification temperature.

Referring to FIG. 1 and FIG. 2, the first film 2 is a transparent waterproof plastic film, and has a first bonding surface 21 which is adhesively adhered to the surface 11 of the substrate 1, and a first surface opposite to the first bonding surface 21. The first joint surface 21 is configured to close the first liquid L1 and the second liquid L2 in the first accommodating groove 12 and the second accommodating groove 13 . The second film 3 is a transparent waterproof plastic film which is adhered to the second bonding surface 22 of the first film 2, and the second film 3 has a bonding surface 31 connecting the second bonding surface 22. The first film 2 and the second film 3 may also be opaque aluminum foil films, but not limited thereto.

The warning unit 4 is adhered to the bonding surface 31 of the second film 3 and corresponding to the positions of the first receiving groove 12 and the second receiving groove 13 of the substrate 1 respectively. Each of the indicator units 4 includes a flow guiding member 41 and a test strip 42 respectively. The flow guiding members 41 respectively correspond to the positions of the first receiving groove 12 and the second receiving groove 13 , and each of the flow guiding members 41 is made of water absorbing material. And each of the flow guiding members 41 has a first end portion 411 and a second end portion 412 opposite to the first end portion 411, wherein the first end portion 411 of the first flow guiding member 41 is first The position of the accommodating groove 12 corresponds to the position of the first end portion 411 of the other flow guiding member 41 corresponding to the position of the second accommodating groove 13 , and the test strips 42 are respectively adhered to the second end portions 412 . When the test paper 42 contacts the first liquid L1 or the second liquid L2, it changes from white to red. The paper sheet 5 is adhered to the bonding surface 31 of the second film 3 and is located between the two flow guiding members 41 for writing characters. In the present embodiment, the test paper 42 is made of moisture-sensitive color-changing paper, and its color-changing reaction is irreversible, and once it is discolored, it cannot be restored to the original color.

Referring to FIG. 3, the following describes the method of using the temperature sensing device of the present invention, temperature sensing. The device can be used to sense whether an item (not shown) stored in a specific temperature range has passed a predetermined critical temperature, for example, to ensure that the frozen fresh food is frozen throughout the transportation process to prevent food spoilage and spoilage. The diet of consumers is healthy. The usage method includes the following steps S1~S6:

Step S1 - Referring to FIG. 2, this step provides a temperature sensing device, and the temperature sensing device can be stored at normal temperature.

Step S2 - This step cools the temperature sensing device and maintains the temperature lower than the second freezing point, that is, -20 ° C, to convert the first liquid L1 and the second liquid L2 into a solid state.

Step S3 - Referring to FIG. 4, in this step, the second film 3 is peeled off from the first film 2, and the first film 2 is pierced to correspond to the first accommodating groove 12 and the second accommodating groove 13, and two openings 23 are formed.

Step S4 - Referring to FIG. 2, this step is to sign or stamp the paper sheet 5 to prevent the temperature sensing device from being dropped.

Step S5 - Referring to FIG. 1 , in this step, the second film 3 is re-attached to the first film 2 .

Step S6 - Referring to Figures 2, 4 and 5, this step places the temperature sensing device with an item (not shown), for example, on a package of an item (not shown) or in a package. If the temperature sensing device is gradually heated to a temperature above the second freezing point during the transportation, the second liquid L2 is converted from a solid state to a liquid state, and thus flows through the first film 2 to flow to the corresponding The first end portion 411 of the flow guiding member 41 of the warning unit 4, and guides the second liquid L2 first end portion 411 to the second end portion 412 by the flow guiding member 41, and finally contacts the corresponding test strip 42, The test paper 42 was changed from white to red as shown in FIG. Therefore, it is only necessary to check whether the test paper 42 has discoloration, and it can be confirmed whether or not the temperature of the article (not shown) rises above the second freezing point during transportation. This embodiment is a second liquid L2 The discoloration after contact with the test paper 42 of the corresponding warning unit 4 is exemplified, that is, the temperature of the representative article has been higher than -20 ° C for some time. If the temperature sensing device is gradually heated to a temperature above the first freezing point (0 ° C) during transportation, the first liquid L1 will also contact the corresponding test paper 42 to discolor according to the same principle. In summary, when the package is received, it is only necessary to check the temperature sensing device to confirm whether the package has been heated to a temperature higher than the preset temperature during the transportation. If only the test paper 42 corresponding to the second accommodating groove 13 is discolored, it means that the package has been heated to a range of -20 ° C to 0 ° C; if both test papers 42 are discolored, it means that the package has been heated to a temperature of 0 ° C or higher.

It should be noted that the warning unit 4 of the temperature sensing device of the present invention may include only the test paper 42 and exclude the flow guiding member 41 in other embodiments, and the test papers 42 will be adhered to the corresponding first receiving slots 12 . And the position of the second accommodating groove 13 can achieve the same sensing effect, but such setting is easy to cause misjudgment, because during the transportation process, the package is inevitably left at room temperature for a short time, if During this period, only a small amount of the first liquid L1 or the second liquid L2 changes from a solid state to a liquid state, and will directly contact the test paper 42 to cause discoloration, but the articles in the package (not shown) such as frozen fresh foods are not deteriorated. Corruption will cause consumers to misjudge and cause unnecessary troubles. The deflector 41 of the present embodiment can serve as a buffer between the first liquid L1 or the second liquid L2 and the corresponding test strip 42, which can effectively avoid this misjudgment, which is a preferred embodiment. In addition, in other embodiments, the substrate 1 of the temperature sensing device may also include only one receiving slot, and the number of the warning unit 4 may be only one, which is not limited to the number disclosed in the embodiment.

In summary, the temperature sensing device and the method of using the same according to the present invention may change color when the test paper 42 of the warning unit 4 contacts the first liquid L1 or the second liquid L2, and the temperature sensing device is first used when in use. Cooling to a temperature lower than the second freezing point of the second liquid L2, causing the second liquid L2 to solidify into a solid state, and then peeling the second film 3 away from the first film 2 and piercing the first film 2 corresponding to the first receiving groove At 12 and the second accommodating groove 13, the temperature sensing device is finally placed together with an article (not shown). In this way, it is possible to sense whether the temperature of the article (not shown) stored in the specific temperature range exceeds the temperature of the second freezing point of the second liquid L2, as long as the test paper 42 is discolored, and if there is discoloration, the article is represented. The temperature of the display once exceeds the temperature of the second freezing point, thereby changing the second liquid L2 from the solid state to the liquid state, and reacting with the test paper 42 of the warning unit 4 to discolor the test paper 42, so that the sensing can be stored in a specific temperature range. Whether the item inside (not shown) has a function exceeding a predetermined critical temperature. Moreover, the temperature sensing device of the present invention has simple components and low manufacturing cost, and can adjust and change the so-called preset critical temperature as long as the liquid of different freezing point is selected or the concentration of the brine in the embodiment is adjusted, so that it can be achieved. The object of the invention.

However, the above is only the embodiment of the present invention, and the scope of the invention is not limited thereto, and all the equivalent equivalent changes and modifications according to the scope of the patent application and the patent specification of the present invention are still The scope of the invention is covered.

1‧‧‧Substrate

12‧‧‧First accommodating slot

13‧‧‧Second accommodating slot

2‧‧‧First film

3‧‧‧Second film

4‧‧‧Warning unit

41‧‧‧ deflector

42‧‧‧ test paper

5‧‧‧paper

L1‧‧‧First liquid

L2‧‧‧Second liquid

Claims (14)

A temperature sensing device includes: a substrate having a surface, and a first receiving groove formed by the surface recessed, the first receiving groove receiving a first liquid, the first liquid having a first a freezing point, the first liquid is converted from a liquid state to a solid state at the first freezing point; a first film is a waterproof material and has a first joint surface connected to the surface of the substrate, and a first opposite to the first a second joint surface of the joint surface, the first joint surface is for closing the first receiving groove; a second film is waterproof and can be detachably connected to the second joint surface of the first film, The second film has a bonding surface connected to the second bonding surface; and at least one warning unit is disposed on the bonding surface of the second film and corresponds to the first receiving groove position of the substrate, the first film The first and second joint faces of a film can be pierced so that the first liquid in the first receiving groove can flow through the first film and flow to the warning unit, the warning unit A test paper that changes color upon contact with the first liquid is included. The temperature sensing device of claim 1, wherein the warning unit further comprises a flow guiding member corresponding to the first receiving groove position and connecting the test paper, the guiding member is for guiding the first liquid Flow to the test paper. The temperature sensing device of claim 2, wherein the flow guiding member is made of a water absorbing material and has a first end portion corresponding to the first receiving groove position, and a first end portion opposite to the first end portion At the two ends, the test paper is adhered to the second end. The temperature sensing device of claim 1, wherein the surface of the substrate is further recessed to form a second accommodating groove separated from the first accommodating groove, the second accommodating groove accommodating a second liquid, The second liquid has a second freezing point, and the second liquid is at the second freezing point The first bonding surface of the first film is used to close the first accommodating groove and the second accommodating groove. The temperature sensing device includes two warning units disposed on the second film. The first and second engaging faces of the first film may be pierced to make the first receiving portion corresponding to the first receiving groove and the second receiving groove. The first liquid and the second liquid in a liquid state in the groove and the second accommodating groove can flow through the first film and flow to the test paper of the corresponding warning unit, and the test paper is discolored. The temperature sensing device of claim 4, wherein each of the warning units further includes a flow guiding member corresponding to the first receiving groove and the second receiving groove, and the guiding members are respectively connected The test papers are used to guide the first liquid and the second liquid to flow to the corresponding test paper. The temperature sensing device of claim 5, wherein each of the flow guiding members is of a water absorbing material, wherein a flow guiding member has a first end portion corresponding to the first receiving groove position, and a opposite The second end portion of the first end portion has another first end portion corresponding to the position of the second receiving groove, and the test strips are respectively adhered to the second end portions. The temperature sensing device according to any one of claims 1 to 6, further comprising a paper sheet disposed on the bonding surface of the second film for writing characters. The temperature sensing device of claim 7, wherein the substrate, the first film, and the second film are transparent materials. The temperature sensing device of any one of claims 4 to 6, wherein the second freezing point of the second liquid is different from the first freezing point. The temperature sensing device of claim 9, wherein the second freezing point is smaller than the first freezing point. The temperature sensing device of claim 10, wherein the first liquid is water and the second liquid The body is saturated saline. A method for using a temperature sensing device, comprising the steps of: providing a temperature sensing device, the temperature sensing device comprising a substrate, a first film attached to the substrate, and a tearably connected to the first a second film of the film and a warning unit, the substrate is recessed to form a receiving groove, the receiving groove is accommodated with a liquid, the liquid has a freezing point, and the liquid changes from a liquid state to a solid state at the freezing point; The sensing device cools and maintains the temperature below the freezing point to turn the liquid into a solid state; the second film is peeled off the first film, and the first film is pierced to accommodate the groove; The second film is further attached to the first film; and the temperature sensing device is placed together with an object, and when the temperature sensing device is exposed to room temperature and gradually warms up, the temperature is higher than the freezing point, the liquid It will change from a solid state to a liquid state, thereby flowing through the first film and flowing to a test strip of the warning unit to discolor the test paper. The method of using the temperature sensing device of claim 12, wherein the temperature sensing device further comprises a paper sheet disposed on the second film, after the step of tearing the second film away from the first film, The method of use also includes a step of signing on the piece of paper. The method of using the temperature sensing device of claim 12 or 13, wherein the liquid is one of water and saline.