Temperature-time indicator label for cold chain transportation
By using a temperature-time indicator tag that requires no power supply and records temperature changes through a bimetallic strip and liquid diffusion, the problem of large size and power requirement of existing cold chain transport tags is solved, enabling lightweight and efficient temperature monitoring and ensuring the quality and safety of perishable goods.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- SHENZHEN DBIA CO LTD
- Filing Date
- 2025-05-06
- Publication Date
- 2026-06-04
AI Technical Summary
Existing cold chain transportation temperature tags are large, require power, and are costly, making it impossible to efficiently monitor the impact of temperature changes on perishable goods.
Design a temperature-time indicator tag that does not require power supply. It utilizes a bimetallic strip and liquid-impregnated filter paper that bends when the temperature exceeds a threshold. The duration of the temperature exceeding the threshold is marked by the diffusion of a colored liquid on the thin filter paper. The tag is then read using a transparent observation window and a time scale.
It enables temperature monitoring without the need for electricity, is lightweight and convenient, and can reliably record temperature changes, ensuring that perishable goods are transported within a suitable temperature range and reducing economic losses.
Smart Images
Figure CN2025092768_04062026_PF_FP_ABST
Abstract
Description
A temperature-time indicator label for cold chain transportation Technical Field
[0001] This invention relates to the field of cold chain transportation auxiliary tools, and in particular to a temperature-time indicator label for cold chain transportation. Background Technology
[0002] Cold chain transportation typically involves perishable goods such as food, pharmaceuticals, and biological products. These products are highly sensitive to temperature changes; recording temperatures ensures they are transported under suitable conditions, thus maintaining quality and efficacy. For some pharmaceuticals and biological products, temperature variations can not only affect efficacy but also potentially lead to safety issues. By monitoring and recording temperatures, potential safety risks can be identified and mitigated. Furthermore, timely monitoring of temperature changes allows for early identification and correction of problems, reducing potential product loss and economic losses. While current mainstream temperature time tags offer accurate recording and diverse functions, they are large, require power, and are costly. Summary of the Invention
[0003] The purpose of this invention is to provide a temperature-time indicator label for cold chain transportation to solve the technical problems existing in the background art.
[0004] To achieve the above objectives, the technical solution of the present invention is as follows:
[0005] A temperature-time indicator label for cold chain transportation includes: a label shell, a label fixing plate, a transparent observation window, a time scale, a bimetallic strip, liquid-impregnated filter paper, and thin filter paper. The label shell is a rectangular shell extending vertically. Two label fixing plates are sealed and fixedly connected to the upper and lower ends of the label shell, respectively. A transparent observation window is provided on the label fixing plate. A time scale is provided on one side of the outer end face of the label fixing plate along the length of the transparent observation window. One end of the bimetallic strip is fixedly connected to the middle of the left inner wall of the label shell. The other end of the bimetallic strip is suspended and fixedly connected to the liquid-impregnated filter paper, which is impregnated with a colored liquid. Thin filter paper with liquid diffusion characteristics is provided on both the upper and lower sides of the bimetallic strip on the inner wall of the label shell. When the temperature exceeds a set threshold temperature, the bimetallic strip bends and the liquid-impregnated filter paper at its suspended end contacts the corresponding thin filter paper. The diffusion length of the colored liquid on the thin filter paper marks the length of time the temperature exceeds the threshold and is measured by the time scale.
[0006] Furthermore, the transparent observation window is a transparent resin film, specifically made of polyvinyl chloride, polyethylene, polypropylene, or polystyrene.
[0007] Furthermore, one end of the bimetallic strip is embedded and fixed in the middle of the left inner wall of the label shell, and the bimetallic strip is a low-temperature sensitive 5J20110.
[0008] Furthermore, the colored liquid is a mixture of polyethylene glycol 400 and a compatible colored pigment.
[0009] Furthermore, a perforated film is provided on the inner wall of the label shell between the liquid-impregnated filter paper and the thin filter paper above the bimetallic strip and between the liquid-impregnated filter paper and the thin filter paper below the bimetallic strip. The perforated film has a hole at the position corresponding to the liquid-impregnated filter paper, and the liquid-impregnated filter paper can pass through the hole and contact the thin filter paper.
[0010] Furthermore, the label housing has two pull-out grooves that extend from the left outer wall of the label housing to the right inner wall between the bimetallic sheet and the two perforated films. The right end of the pull-out groove is fixedly connected to the right end of the activation film, which can slide in connection with the pull-out groove. The left end of the activation film extends to the left outer side of the label housing, and a tear strip is provided near the right edge of the activation film.
[0011] Furthermore, a handle is fixedly connected to the left end of the activation film.
[0012] Furthermore, four C-shaped support legs are symmetrically arranged on the left and right ends of the front and rear side walls of the label housing. One end of each support leg is fixedly connected to the side wall of the label housing, and the other end of each support leg extends to the bottom of the label fixing plate.
[0013] Furthermore, double-sided adhesive tape is glued and fixed to the bottom end of the support leg.
[0014] Compared with the prior art, the beneficial effects of the present invention are:
[0015] 1. When using this invention, simply pull the starting film off the tear strip and remove it. When the temperature inside the cold chain transport compartment exceeds the set threshold temperature, the bimetallic strip bends, and the liquid-impregnated filter paper at its suspended end passes through the membrane hole of the perforated film and contacts the thin filter paper. The colored liquid on the impregnated filter paper diffuses on the thin filter paper. The diffusion length marks the length of time the temperature exceeds the threshold. The time scale on the label shell allows direct observation of the liquid diffusion through the transparent viewing window, and the time can be determined according to the time scale. The entire device does not require power and is lightweight.
[0016] 2. By setting up an activation film structure, this structure ensures that when the label is not in use, regardless of temperature changes, the liquid-impregnated filter paper is blocked by the activation film and cannot contact the thin filter paper, so the label does not work, thus ensuring the reliability of the label.
[0017] 3. The present invention is designed for bidirectional temperature recording. When the temperature exceeds the threshold temperature in the opposite direction, the bimetallic strip will bend in the opposite direction, and the time can be recorded on the other side, thereby calibrating the temperature change within a certain range. Attached Figure Description
[0018] Figure 1 is a schematic diagram of the structure of the present invention;
[0019] Figure 2 is a transverse longitudinal sectional view of the present invention;
[0020] Figure 3 is a cross-sectional view of the present invention at the activation film;
[0021] Figure 4 is a bottom view of the present invention.
[0022] The labels in the attached diagram are as follows: 1-Label shell, 2-Label fixing plate, 3-Transparent observation window, 4-Time scale, 5-Bimetallic strip, 6-Immersed filter paper, 7-Starting membrane, 701-Tear strip, 8-Pull handle, 9-Perforated membrane, 901-Membrane hole, 10-Thin filter paper, 11-Support leg, 12-Double-sided adhesive tape. Detailed Implementation
[0023] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.
[0024] Referring to Figures 1-4, a temperature-time indicator label for cold chain transportation includes: a label shell 1, a label fixing plate 2, a transparent observation window 3, a time scale 4, a bimetallic strip 5, liquid-impregnated filter paper 6, and thin filter paper 10. The label shell 1 is a rectangular shell extending vertically. Two label fixing plates 2 are sealed and fixedly connected to the upper and lower ends of the label shell 1, respectively. A transparent observation window 3 is provided on the label fixing plate 2. A time scale 4 is provided on one side of the outer end face of the label fixing plate 2 along the length direction of the transparent observation window 3. The label shell 1 has a time scale 4 on the inner wall of the left side. One end of the bimetallic strip 5 is fixedly connected to the label housing 1, and the other end of the bimetallic strip 5 is suspended and fixedly connected to a liquid-impregnated filter paper 6. The liquid-impregnated filter paper 6 is impregnated with a colored liquid. Thin filter paper 10 with liquid diffusion characteristics is provided on both the upper and lower sides of the bimetallic strip 5 on the inner wall of the label housing 1. When the temperature exceeds the set threshold temperature, the bimetallic strip 5 bends and the liquid-impregnated filter paper 6 at its suspended end contacts the corresponding thin filter paper 10. The diffusion length of the colored liquid on the thin filter paper 10 marks the length of time that the temperature exceeds the threshold and is measured by a time scale 4.
[0025] In this embodiment, the transparent observation window 3 is a transparent resin film, specifically made of polyvinyl chloride (PVC), polyethylene (PE), polypropylene (PP), polystyrene (PS) or other resins.
[0026] In this embodiment, one end of the bimetallic strip 5 is embedded and fixed in the middle of the left inner wall of the label shell 1. The bimetallic strip 5 is a low-temperature sensitive 5J20110, and the threshold temperature set in this invention is 4℃.
[0027] In this embodiment, the colored liquid is a mixture of polyethylene glycol 400 and a compatible colored pigment.
[0028] In this embodiment, a perforated film 9 is provided on the inner wall of the label shell 1 between the liquid-impregnated filter paper 6 and the thin filter paper 10 above the bimetallic sheet 5 and between the liquid-impregnated filter paper 6 and the thin filter paper 10 below the bimetallic sheet 5. The perforated film 9 has a film hole 901 at a position corresponding to the liquid-impregnated filter paper 6, so that the liquid-impregnated filter paper 6 can pass through the film hole 901 and contact the thin filter paper 10.
[0029] In this embodiment, the label housing 1 has two pull-out grooves that extend from the left outer wall of the label housing 1 to the right inner wall between the bimetallic sheet 5 and the two perforated films 9. The right end of the pull-out groove is fixedly connected to the right end of the activation film 7, which can slide with the pull-out groove. The left end of the activation film 7 extends to the left outer side of the label housing 1. A tear strip 701 is provided near the right edge of the activation film 7. By setting the activation film 7 structure, this structure ensures that when the label is not in use, no matter how the temperature changes, the liquid-impregnated filter paper 6 is blocked by the activation film 7 and cannot contact the thin filter paper 10, so the label does not work, thus ensuring the reliability of the label.
[0030] In this embodiment, a handle 8 is fixedly connected to the left end of the activation film 7, which allows the activation film 7 to be easily pulled off and removed.
[0031] In this embodiment, four support legs 11 are symmetrically arranged at the left and right ends of the front and rear side walls of the label housing 1. The support legs 11 are C-shaped. One end of the support leg 11 is fixedly connected to the side wall of the label housing 1, and the other end of the support leg 11 extends to the bottom of the label fixing plate 2. The four support legs 11 facilitate the stable placement of the entire device and also facilitate the determination of the vertical direction of the label.
[0032] In this embodiment, a double-sided adhesive tape 12 is glued and fixed to the bottom end of the support leg 11. The double-sided adhesive tape 12 makes it easy to fix the entire device firmly in a suitable position inside the cold chain transport vehicle.
[0033] Working principle: When using this invention, simply pull the starting membrane 7 from the tear strip 701 and remove it. When the temperature inside the cold chain transport compartment exceeds the set threshold temperature, the bimetallic strip 5 bends, and the liquid-impregnated filter paper 6 at its suspended end passes through the membrane hole 901 of the perforated membrane 9 and contacts the thin filter paper 10. The colored liquid on the liquid-impregnated filter paper 6 diffuses on the thin filter paper 10. The diffusion length marks the length of time the temperature exceeds the threshold and is measured by the time scale 4 on the label shell 1. The liquid diffusion can be directly seen through the transparent observation window 3, and the time can be determined according to the time scale 4. The entire device does not require power and is lightweight. When the temperature exceeds the threshold temperature in the opposite direction, the bimetallic strip bends in the opposite direction, and the time can be recorded on the other side, thereby marking the temperature change within a certain range.
[0034] In the description of this invention, it should be noted that the terms "upper", "lower", "left", "right", "inner", "outer", "top / bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.
[0035] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any simple modifications, equivalent substitutions, and improvements made by those skilled in the art to the above embodiments without departing from the scope of the technical solution of the present invention, based on the technical essence of the present invention, shall still fall within the protection scope of the technical solution of the present invention.
Claims
1. A temperature-time indicator label for cold chain transportation, characterized in that, include: The label housing (1), label fixing plate (2), transparent observation window (3), time scale (4), bimetallic strip (5), liquid-impregnated filter paper (6), and thin filter paper (10) are provided. The label housing (1) is a rectangular shell that runs vertically through the top and bottom. Two label fixing plates (2) are sealed and fixedly connected to the top and bottom ends of the label housing (1). A transparent observation window (3) is provided on the label fixing plate (2). A time scale (4) is provided on one side of the outer end face of the label fixing plate (2) along the length direction of the transparent observation window (3). A bimetallic strip is fixedly connected to the middle of the left inner wall of the label housing (1). One end of the bimetallic strip (5) is suspended and fixedly connected to a liquid-impregnated filter paper (6). The liquid-impregnated filter paper (6) is impregnated with a colored liquid. The inner wall of the label shell (1) is provided with thin filter paper (10) with liquid diffusion characteristics on both the upper and lower sides of the bimetallic strip (5). When the temperature exceeds the set threshold temperature, the bimetallic strip (5) bends and the liquid-impregnated filter paper (6) at its suspended end contacts the corresponding thin filter paper (10). The diffusion length of the colored liquid on the thin filter paper (10) marks the time length of the temperature exceeding the threshold and is measured by a time scale (4).
2. The temperature-time indicator label for cold chain transportation according to claim 1, characterized in that: The transparent observation window (3) is a transparent resin film, specifically made of polyvinyl chloride, polyethylene, polypropylene or polystyrene.
3. A temperature-time indicator label for cold chain transportation according to claim 1, characterized in that: One end of the bimetallic strip (5) is embedded and fixed in the middle of the left inner wall of the label shell (1). The bimetallic strip (5) is a low-temperature sensitive 5J20110.
4. A temperature-time indicator label for cold chain transportation according to claim 1, characterized in that: The colored liquid is a mixture of polyethylene glycol 400 and a compatible colored pigment.
5. A temperature-time indicator label for cold chain transportation according to claim 1, characterized in that: A perforated film (9) is provided on the inner wall of the label shell (1) between the liquid-impregnated filter paper (6) and the thin filter paper (10) above the bimetallic strip (5) and between the liquid-impregnated filter paper (6) and the thin filter paper (10) below the bimetallic strip (5). The perforated film (9) has a film hole (901) at a position corresponding to the liquid-impregnated filter paper (6), and the liquid-impregnated filter paper (6) can pass through the film hole (901) to contact the thin filter paper (10).
6. A temperature-time indicator label for cold chain transportation according to claim 5, characterized in that: The label housing (1) has two pull-out grooves that extend from the left outer wall of the label housing (1) to the right inner wall between the bimetallic sheet (5) and the two perforated films (9). The right end of the pull-out groove is fixedly connected to the right end of the activation film (7). The activation film (7) can slide with the pull-out groove. The left end of the activation film (7) extends to the left outer side of the label housing (1). The activation film (7) is provided with a tear strip (701) near its right edge.
7. A temperature-time indicator label for cold chain transportation according to claim 6, characterized in that: A handle (8) is fixedly connected to the left end of the activation film (7).
8. A temperature-time indicator label for cold chain transportation according to claim 1, characterized in that: The label housing (1) has four symmetrical support legs (11) on the left and right ends of the front and rear side walls. The support legs (11) are C-shaped. One end of the support leg (11) is fixedly connected to the side wall of the label housing (1), and the other end of the support leg (11) extends to the bottom of the label fixing plate (2).
9. A temperature-time indicator label for cold chain transportation according to claim 8, characterized in that: The bottom end of the support leg (11) is glued and fixed with double-sided adhesive tape (12).