Thermochromic scale
By integrating irreversible and reversible thermochromic paper onto the measuring tape, the problems of error and damage to the measuring tape in high-temperature working environments are solved, enabling high-temperature warnings and real-time temperature alerts, thus improving the convenience and accuracy of the measuring tool.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- NINGBO BAOFENG TOOLS & MEASURING IMPLEMENTS CO LTD
- Filing Date
- 2025-07-21
- Publication Date
- 2026-07-17
Smart Images
Figure CN224517580U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of ruler technology, specifically a thermosensitive color-changing ruler. Background Technology
[0002] As a basic measuring tool, the core function of a measuring tape is to achieve precise measurement of length, distance, or size through a flexible strip structure. It is usually made of materials such as metal (e.g., stainless steel), fiber (e.g., fiberglass) or plastic.
[0003] A search revealed a Chinese patent (CN207922975U) that discloses a measuring tape strip capable of quickly reading and measuring dimensions. The strip includes a front and a back. One side of the front of the tape is marked with metric graduations, and the other side with precision graduations. The metric and precision graduations correspond to each other. The distance between two adjacent cleavage marks on the metric graduations is mm, and the nth cleavage mark of the metric graduations is marked with a matching number below it, where n is a natural number. Similarly, the distance between two adjacent cleavage marks on the precision graduations is mm, and the nth cleavage mark of the precision graduations is marked with a matching number above it. This allows users to quickly read the measured dimensions by combining the numbers on the metric and precision graduations, providing clear and intuitive indication.
[0004] However, in actual use, it was found that the above-mentioned and existing rulers usually rely on the scale lines and require manual reading of values. In high-temperature working environments, they are prone to errors due to line of sight deviation, and may fail to measure due to thermal deformation or damage. Additional temperature measuring tools are required to avoid the risks of high-temperature operations and increase the difficulty of manual operation. Therefore, we propose a thermosensitive color-changing ruler. Utility Model Content
[0005] The technical problem to be solved by this application is that the above-mentioned and existing rulers can only rely on the scale lines and require manual reading of values. In high-temperature working environments, they are prone to errors due to line of sight deviation and may fail to measure due to thermal deformation or damage. Additional temperature measuring tools are required to avoid the risks of high-temperature operations and increase the difficulty of manual operation.
[0006] To address the aforementioned technical problems, this application provides a thermochromic ruler strip, comprising a ruler strip, one side of the front of the ruler strip being marked with metric graduations, the other side of the front of the ruler strip being marked with precision graduations, and the front of the ruler strip being marked with numbers that correspond to the metric and precision graduations. A white cardboard is also adhered to one side of the front of the ruler strip, and an irreversible thermochromic paper is disposed on the front of the white cardboard. A reversible thermochromic paper is also disposed on the other side of the front of the ruler strip.
[0007] In some embodiments, the front side of the measuring tape is provided with an indentation line, and the measuring tape is divided into multiple tape segments by the indentation line.
[0008] In some embodiments, the metric and precision graduations on the front of the plurality of tape segments are cyclic.
[0009] In some embodiments, the back of the ruler is provided with adhesive, and a release paper is attached to the back of the adhesive.
[0010] In some embodiments, the back of the irreversible thermochromic paper is provided with a peel-off adhesive for bonding with whiteboard paper.
[0011] In some embodiments, the irreversible thermochromic paper is teardrop-shaped, and the edges of the irreversible thermochromic paper are curled.
[0012] This utility model has at least the following beneficial effects:
[0013] When using this thermochromic measuring tape to measure products, the irreversible thermochromic paper will undergo an irreversible color change when the product reaches the high temperature threshold, providing workers with an intuitive high temperature warning. The measurement status can be quickly judged without manually recording temperature data, ensuring that the process meets the standards and improving product quality control. The reversible thermochromic paper will change color when the ambient temperature approaches or exceeds the safety boundary, providing real-time temperature warnings and preventing the measuring tool from being damaged or malfunctioning due to high temperatures. The whiteboard paper is used to record additional information and supplement measurement details. The three complement each other, significantly improving the practicality and convenience of the measuring tool. Attached Figure Description
[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model;
[0015] Figure 2 This is a partial unfolded view of the ruler-belt structure of this utility model;
[0016] Figure 3 This is a top view of a single ruler segment structure of this utility model;
[0017] Figure 4 This is a side view of the ruler / tape structure of this utility model;
[0018] Figure 5 This is a bottom view of the structure of a single irreversible thermochromic paper according to this utility model.
[0019] In the diagram: 1. Ruler tape; 101. Ruler tape segment; 2. Metric scale; 3. Precision scale; 4. Number; 5. Whiteboard paper; 6. Irreversible thermochromic paper; 7. Reversible thermochromic paper; 8. Crease line; 9. Adhesive; 10. Release paper; 11. Peel-off adhesive. Detailed Implementation
[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0021] Example 1: Please refer to Figure 1 and Figure 2 This utility model provides a technical solution: a thermosensitive color-changing ruler, including a ruler 1, one side of the front of the ruler 1 is marked with a metric scale 2, the other side of the front of the ruler 1 is marked with a precision scale 3, the front of the ruler 1 is marked with numbers 4 that are compatible with the metric scale 2 and the precision scale 3, a white cardboard 5 is also glued to one side of the front of the ruler 1, an irreversible thermosensitive color-changing paper 6 is provided on the front of the white cardboard 5, and a reversible thermosensitive color-changing paper 7 is provided on the other side of the front of the ruler 1.
[0022] Metric scale 2 is used for routine length, distance, or size measurements, providing graduations in millimeters (mm). It is the most basic measurement function of the tape 1. Precision scale 3 provides finer measurements based on metric scale 2, possibly with graduations in smaller units (such as 0.1 mm or smaller). It is suitable for applications requiring high-precision measurements. When tape 1 is involved in international cooperation or export, imperial scales can be marked on the back of tape 1. Imperial scales use inches as the main unit, with 1 inch equal to 2.54 centimeters. This is suitable for applications requiring precise length measurements, such as construction and machinery manufacturing.
[0023] The special material of whiteboard paper 5 allows it to be erased after recording on the surface, making it suitable for scenarios where data is frequently recorded. It also makes up for the limitation of irreversible thermochromic paper 6, which can only be used once, and facilitates the reuse of the measuring tape 1 and the updating of measurement records.
[0024] The surface of the irreversible thermochromic paper 6 is coated with a layer of thermochromic coating (thermochromic layer), which contains chemical substances such as colorless dyes (leuco dyes), color developers, sensitizers and adhesives. These components remain stable at room temperature, and the colorless dyes are colorless. When the product reaches the high temperature threshold, the color of the irreversible thermochromic paper 6 will change irreversibly, providing workers with an intuitive high temperature warning.
[0025] The surface of the reversible thermochromic paper 7 is coated with a dye containing temperature-sensitive compounds. When the temperature rises, these compounds undergo chemical reactions, such as electron transfer or changes in molecular structure, resulting in a color change. When the temperature drops, these reactions reverse, the compounds return to their original state, and the color is restored. When the ambient temperature approaches or exceeds the safety boundary, the color of the reversible thermochromic paper 7 will undergo a reversible change, providing workers with real-time temperature warnings.
[0026] Example 2: Based on Example 1, such as Figure 2 and Figure 3 As shown, the front of the tape 1 has an indentation line 8, and the tape 1 is divided into multiple tape segments 101 by the indentation line 8. The metric scale 2 and precision scale 3 on the front of the multiple tape segments 101 are cyclic.
[0027] The measuring tape 1 is divided into multiple independent segments 101 by the indentation lines 8, allowing workers to freely choose to use one or more segments 101 according to the length of the object being measured or their needs. This avoids the inconvenience caused by the conventional measuring tape 1 being too long (such as tangling or bending), and is especially suitable for measuring narrow spaces or complex shapes. The metric scale 2 and precision scale 3 of each segment 101 are cyclical (e.g., 0-100mm cycle), allowing workers to continuously measure longer objects without moving the measuring tape 1. Measurements are completed directly by splicing the segments 101, reducing the need for frequent alignment or movement of the measuring tape 1 and improving measurement efficiency.
[0028] Example 3: Based on Example 2, such as Figure 4 As shown, the back of the ruler 1 is provided with adhesive 9, and the back of the adhesive 9 is connected with release paper 10.
[0029] The adhesive 9 allows the ruler 1 to be attached to the surface of the object being measured without manual intervention, thus avoiding reading errors caused by displacement or shaking of the object and improving measurement accuracy and reliability.
[0030] Example 4: Based on Example 3, such as Figure 5 As shown, the back of the irreversible thermal color-changing paper 6 is provided with a tear-off adhesive 11 for sticking to the whiteboard paper 5. The irreversible thermal color-changing paper 6 is teardrop-shaped and has curled edges.
[0031] The tear-off adhesive 11 ensures that the irreversible thermochromic paper 6 does not detach from the whiteboard paper 5 during measurement, and can be torn off without damage when not needed, avoiding affecting the use of the whiteboard paper 5. Its curled edge design makes the edge of the irreversible thermochromic paper 6 curl up, increasing the contact area between the worker and the irreversible thermochromic paper 6, making it easy for the worker to pinch the curled edge and tear off the irreversible thermochromic paper 6, improving the convenience of replacement.
[0032] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention.
Claims
1. A heat-sensitive color-changing scale band, characterized by: Includes a ruler (1), one side of the front of the ruler (1) is marked with a metric scale (2), the other side of the front of the ruler (1) is marked with a precision scale (3), the front of the ruler (1) is marked with numbers (4) that match the metric scale (2) and the precision scale (3), one side of the front of the ruler (1) is also glued with white cardboard (5), the front of the white cardboard (5) is provided with irreversible thermochromic paper (6), the other side of the front of the ruler (1) is also provided with reversible thermochromic paper (7).
2. The heat-sensitive discoloration scale band according to claim 1, characterized by: The front of the measuring tape (1) is provided with an indentation line (8), and the measuring tape (1) is divided into multiple measuring tape segments (101) by the indentation line (8).
3. The heat-sensitive discoloration scale band according to claim 2, characterized by: The metric scale (2) and precision scale (3) on the front of the multiple scale segments (101) are cyclic.
4. The heat-sensitive discoloration scale band according to claim 1, characterized by: The back of the ruler (1) is provided with adhesive (9), and the back of the adhesive (9) is connected with release paper (10).
5. The thermochromic scale ribbon of claim 1, wherein: The back of the irreversible thermochromic paper (6) is provided with a tear-off adhesive (11) for bonding with the whiteboard paper (5).
6. The heat-sensitive discoloration scale band according to claim 5, characterized by: The irreversible thermochromic paper (6) is teardrop-shaped, and the edges of the irreversible thermochromic paper (6) are curled.