Sample preparation device for plant short fiber tensile sample and application method of sample preparation device

Abstract

The present invention relates to a plant short fiber tensile sample preparation apparatus, which comprises: a bottom plate, which is prepared from silica gel, and is provided with a resin groove hole; wherein the number of the resin groove holes is at least two, and a connecting groove is arranged between each resin groove hole and the adjacent resin groove hole. The invention further relates to an application method of the sample preparation device for the plant short fiber tensile sample. According to the sample preparation device, the silica gel is adopted to prepare the bottom plate, the bottom plate prepared from the silica gel is not adhered to the resin, and the resin groove holes are formed in the bottom plate, so that the size of the solidified resin can be conveniently controlled, and the preparation efficiency and the success rate of the plant short fiber tensile sample are improved.

Description

Technical Field

[0001] The invention relates to the technical field of plant short fiber tensile testing, and in particular to a sample preparation device for a plant short fiber tensile test specimen and an application method thereof. Background Art

[0002] The mechanical property testing technology of single plant fibers is a commonly used technology in the field of wood science today. Due to the small size of single fibers and the difficulty in measurement, single fiber stretching technology is an international problem. At present, the high-precision short fiber mechanical property tester, as a special instrument for testing the mechanical properties of plant short fibers, can meet the research on the tensile mechanical properties of single fibers. However, the single fiber sample preparation method is still very complicated and time-consuming. The quality of the single fiber tensile sample directly affects the result of the single fiber tensile test. At present, the single fiber tensile sample preparation uses a plexiglass plate with a 2mm slit. Double-sided tape is affixed to both sides of the slit in advance. After the fiber is glued to both ends of the slit of the plexiglass plate, a drop of glue is added to both ends of the fiber, and then cured for testing. This method can only be used for fibers with a length of more than 2mm, and the glue dripping effect is poor. Figure 1 As shown, the resin droplets easily penetrate along the outer wall of the fiber, which may destroy the original structure of the plant short fiber and make the test results unrepresentative; and the size of the resin droplets at both ends cannot be controlled. The uneven size of the resin droplets at both ends may cause slippage during stretching or damage due to stretching shear, resulting in distortion of the test results; and the double-sided tape and resin will affect the use of the plexiglass plate, making it difficult to clean and not conducive to reuse. The success rate of resin droplets at both ends of the fiber is low, it is difficult to control the size of the resin droplets, and the repeatability is poor. It usually takes two months for the operator to learn sample preparation and master it. It takes a long time for beginners to use this device to prepare an effective sample. Summary of the invention

[0003] In view of the technical problems existing in the prior art, the purpose of the present invention is to provide a sample preparation device for plant short fiber tensile specimens, so as to solve the problem that in the existing method for preparing plant short fiber tensile specimens, resin droplets easily penetrate along the outer wall of the fiber, destroying the original structure of the plant short fiber, making the test results unrepresentative, and the size of the resin droplets at both ends cannot be controlled.

[0004] Another object of the present invention is to provide an application method of a sample preparation device for plant short fiber tensile test specimens to improve the preparation efficiency of plant short fiber tensile test specimens.

[0005] In order to achieve the above object, the present invention adopts the following technical solution: A sample preparation device for plant short fiber tensile test specimens comprises: a bottom plate made of silica gel and provided with resin slots; wherein the number of the resin slots is at least two, and a connecting slot is provided between each resin slot and an adjacent resin slot.

[0006] As a preferred embodiment, the vertical cross-section of the resin slot hole is arc-shaped, and the diameter of the resin slot hole is 0.03-0.1 mm.

[0007] As a preferred embodiment, the vertical cross-section of the connecting groove is arc-shaped, and the diameter of the connecting groove is 0.02-0.5 mm.

[0008] As a preferred embodiment, a scale is provided on the bottom plate.

[0009] As a preferred embodiment, the resin slot holes and the connection slots are formed on the bottom plate by laser drilling.

[0010] An application method of a sample preparation device for a plant short fiber tensile specimen, the application method adopts a sample preparation device for a plant short fiber tensile specimen; the method comprises the following steps: Place a single plant short fiber into the connection groove using tweezers; Adjust the single plant short fiber to coincide with the center connecting line of the two resin tank holes; Use one end of the tweezers to absorb the resin and drop the absorbed resin into the two resin tank holes respectively until the two resin tank holes are filled with resin; If there is excess resin, absorb it through filter paper; After the resin is solidified, a single plant short fiber and the resin at both ends are taken out with tweezers to complete the preparation of the plant short fiber tensile specimen.

[0011] As a preferred method, a single plant short fiber is obtained by diluting and dispersing the extracted plant short fibers using a deflaker, placing the dispersed plant short fibers evenly in a culture dish, and drying them to obtain a single plant short fiber.

[0012] In general, the present invention has the following advantages: The sample preparation device of the present invention adopts a silicone material that is not sticky to the resin as a panel, and the resin drops are directly dropped into the resin slot hole, so the size of the resin drops can be controlled, ensuring that the resin drops have a uniform size and the span between two resin drops is uniform. In addition, the sample preparation device can be applicable to plant short fibers with a length of ≥0.5 mm, covering the length sizes of most plant short fibers. After experiments, beginners can skillfully use the sample preparation device to prepare single fiber tensile specimens within one day, thereby improving the success rate of sample preparation of plant short fiber tensile specimens, and can prepare a large number of single fiber tensile specimens at one time, greatly improving the sample preparation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 Schematic diagram of the traditional method for preparing tensile specimens of single plant short fibers.

[0014] Figure 2 A diagram of a single plant staple fiber tensile specimen prepared using the device of the present invention.

[0015] Figure 3 It is a schematic diagram of the device structure of the present invention.

[0016] Figure 4 It is a front view of the device of the present invention.

[0017] Figure 5 It is a top view of the device of the present invention.

[0018] Figure 6 It is a left side view of the device of the present invention.

[0019] Figure 7 This is a schematic diagram of the sample preparation device described in specific application example 1 of the present invention.

[0020] Figure 8 This is a schematic diagram of the sample preparation device described in specific application example 2 of the present invention.

[0021] Fig. 9 This is a schematic diagram of the sample preparation device described in specific application example 3 of the present invention.

[0022] In the figure: 1. resin ball; 2. connecting groove; 3. resin slot hole; 4. plant short fiber; 5. base. DETAILED DESCRIPTION

[0023] The present invention will be further described in detail below in conjunction with specific implementation methods.

[0024] Based on the current plant short fiber 4 tensile sample preparation, a plexiglass plate with a 2mm slit is used. Double-sided tape is pasted on both sides of the slit in advance. After the fiber is glued to both ends of the slit of the plexiglass plate, a drop of glue is dripped on both ends of the fiber, and then solidified for testing. This method can only be used for fibers with a length of more than 2mm, and the glue dripping effect is poor. Figure 1 As shown, the resin droplets easily penetrate along the outer wall of the fiber, which may destroy the original structure of the plant fiber and make the test results unrepresentative; and the size of the resin droplets at both ends cannot be controlled. The uneven size of the resin droplets at both ends may cause slippage during stretching or damage due to stretching shear, resulting in distortion of the test results; compared with the prior art, the sample preparation device provided in this embodiment adopts a silicone material that is not sticky to the resin as a panel, and the resin droplets are directly dripped into the resin slot hole 3, so that the size of the resin droplets can be controlled, such as Figure 2As shown, the resin droplets at both ends of a single plant fiber prepared by the sample preparation device of this embodiment are uniform in size, the span between the two resin droplets is uniform, and the device is applicable to plant short fibers 4 with a length ≥ 0.5 mm, which almost covers the length size of most plant fibers; after testing, beginners can skillfully use the device to prepare single fiber tensile specimens within one day; the sample preparation device provided in this embodiment improves the success rate of preparing the sample of plant short fiber 4 tensile specimens, and can prepare a large number of single fiber tensile specimens at one time, greatly improving the sample preparation efficiency, as shown in the following embodiments: Embodiment 1 like Figure 3-Figure 9 As shown, a sample preparation device for a plant short fiber 4 tensile specimen provided in this embodiment includes: a bottom plate, the bottom plate is made of silicone, and a resin slot hole 3 is provided on the bottom plate; wherein, the number of the resin slot holes 3 is at least two, and a connecting slot 2 is provided between each resin slot hole 3 and the adjacent resin slot hole 3.

[0025] The cross section of the resin slot hole 3 is arc-shaped. Specifically, the resin slot hole 3 can be a hemispherical hole, whose vertical cross section is arc-shaped and whose horizontal cross section is circular. The diameter of the resin slot hole 3 is 0.03-0.1 mm.

[0026] The cross section of the connecting groove 2 is arc-shaped. Specifically, the connecting groove 2 can be a cylinder cut in half along the axial direction. The vertical cross section of the connecting groove 2 is arc-shaped, and the horizontal cross section is rectangular. The diameter of the connecting groove 2 is 0.01-0.05mm.

[0027] The vertical direction described above is a direction parallel to the thickness direction of the bottom plate, and the horizontal section is a plane parallel to the top plane of the bottom plate.

[0028] A scale is provided on the bottom plate. Specifically, the scale is provided to help accurately control the distance between the two ends of the fiber where glue is dripped.

[0029] The resin slot hole 3 and the connection slot 2 are formed on the bottom plate by laser drilling. According to the current drilling technology, a silicone curved surface laser drilling machine can be used to drill micron-sized holes, and the drilled micron-sized holes are smooth.

[0030] Specifically, the silicone base 5 is a rectangular flat plate structure. In the length direction of the base 5, 10 resin slots 3 are grouped together, and the spacing between two adjacent resin slots 3 is 0.5 mm. A total of 8 groups are set, and the 8 groups of resin slots 3 are spaced apart along the width direction of the bottom plate. Through such a setting, a large number of single fiber tensile specimens can be prepared at one time, which greatly improves the sample preparation efficiency. For example, if the required plant short fiber sample length is 0.5 mm, the same group of resin slots can prepare 5 plant short fiber samples at the same time, and 8 groups can prepare 40 plant short fiber samples at the same time; if the length of the plant short fiber is 1 mm, a group of resin slots can prepare 3 plant short fiber samples at the same time, and 8 groups can prepare at least 24 plant short fibers; and so on, plant short fiber samples of different lengths can be prepared as needed, and multiple can be prepared at the same time.

[0031] Embodiment 2 This embodiment provides an application method of a sample preparation device for a plant short fiber 4 tensile test sample, and the application method uses a sample preparation device for a plant short fiber 4 tensile test sample; the method comprises the following steps: Place a single plant short fiber 4 into the connecting groove 2 using tweezers; The short fibers are adjusted to coincide with the center connecting line of the two resin slot holes; Use one end of the tweezers to absorb the resin, and drop the absorbed resin into the two resin slots 3 respectively until the two resin slots 3 are filled with resin; If there is excess resin, absorb it through filter paper; After the resin is solidified, a single plant short fiber and the resin at both ends are taken out with tweezers to complete the preparation of the plant short fiber 4 tensile test specimen.

[0032] The resin can be dripped into two adjacent resin slot holes 3. For example, the distance between the two adjacent resin drops is 0.5 mm. The resin can be dripped into different circular holes, and the distance between the two resin drops is a multiple of 0.5 mm. Fig. 9 As shown; The method for obtaining a single plant short fiber 4 is as follows: using a deflaker to dilute and disperse the extracted plant short fibers 4, placing the dispersed plant short fibers 4 evenly in a culture dish, and drying them to obtain a single plant short fiber 4.

[0033] Specific application example 1 like Figure 7 The schematic diagram of the sample preparation device for the plant short fiber 4 tensile test sample of this embodiment is shown. The tensile test sample preparation process of short fibers (fiber length ≤ 1 mm) such as hardwood includes the following steps: The extracted fibers are diluted and dispersed by a deflaker, evenly dispersed in a culture dish, and dried; Use ultra-fine tweezers to pick up the end of the fiber and place the fiber in the connecting slot 2 of the device so that one end of the fiber is aligned with the center of the first resin slot hole 3 of the device; Drop the pre-configured resin into the two resin tank holes 3, and adjust the single plant short fiber to coincide with the center connecting line of the two resin tank holes; After the resin dries, a resin ball 1 is formed, and the size of the resin ball 1 is consistent with the size of the resin slot hole 3; The distance between the two resin balls 1 is also fixed and uniform; After the resin is solidified, use ultra-fine tweezers to gently remove the resin balls 1 at both ends of the fiber. The sample can be used for tensile testing in the ball-groove fixture of a high-precision short fiber tensile tester. Among them, the short fibers of hardwood and the like are relatively short, and the distance between the two resin balls 1 is preferably controlled between two adjacent resin slots 3 .

[0034] Specific application example 2 like Figure 8 As shown in the figure, the tensile specimen preparation process of softwood fiber, bamboo fiber and other fibers (fiber length ≥ 1 mm) includes the following steps: The extracted fibers are diluted and dispersed by a deflaker, evenly dispersed in a culture dish, and dried; Using ultra-fine tweezers to pick up the end of the fiber, the fiber is placed in the resin slot hole 3 of the device so that one end of the fiber is aligned with the center of the first resin slot hole 3 of the device; Drop the pre-configured resin into the two resin slots 3, and adjust the single plant short fiber to coincide with the center connecting line of the two resin slots. The distance between the two resin slots 3 corresponds to the length of the fiber. After the resin is solidified to form resin balls 1, the resin balls 1 at both ends of the fiber are gently taken out with ultra-fine tweezers. The sample can be used for tensile testing in a ball-groove fixture of a high-precision short fiber tensile tester.

[0035] Specific application example 3 like Fig. 9 As shown, this embodiment provides a sample preparation device for tensile test specimens of plant short fibers 4 with a length of more than 5 mm, which can realize control of different spacings, and includes the following implementation steps: The dispersed plant short fibers 4 are placed in a culture dish for drying.

[0036] Use ultra-fine tweezers (VETUS-ESD-11) to pick up one end of the fiber and put it into the resin slot hole 3 of the bottom plate so that one end of the fiber is aligned with the center of the resin slot hole 3.

[0037] like Fig. 9As shown, according to actual needs, resin can be dripped into two resin slot holes 3 with different intervals, and a single plant short fiber can be adjusted to coincide with the center connecting line of the two resin slot holes, thereby preparing tensile specimens with different spans between fibers for subsequent testing of the effects of different tensile spans on the tensile properties of the plant short fiber 4.

[0038] Compared with the existing technology, the sample preparation device for the tensile test specimen of the plant short fiber 4 provided in the above embodiment takes into account the characteristics of the plant short fiber 4, and sets corresponding resin slots 3. The size of the resin droplets is uniformly controlled through the resin slots 3, so that uniform resin droplets are formed at both ends of the fiber, ensuring the symmetry of the plant short fiber 4 during the tensile test process and improving the accuracy of the test results. In addition, by setting several rows of corresponding resin slots 3 and connecting slots 2 on the bottom plate, a large number of tensile test specimens of the plant short fiber 4 can be prepared at one time, which greatly improves the sample preparation efficiency of the tensile test specimens of the plant short fiber 4.

[0039] The fibers and plant short fibers 4 mentioned in the above embodiments are both plant short fibers 4, and the difference between them is the length. The resin droplets in the above embodiments form resin balls 1 after solidification.

[0040] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be equivalent replacement methods and are included in the protection scope of the present invention.

Claims

1. A sample preparation device for plant short fiber tensile test specimens, characterized in that: include: The bottom plate is made of silicone and is provided with resin slots; wherein, the number of the resin slots is at least two, and a connecting slot is provided between each resin slot and an adjacent resin slot.

2. A sample preparation device for a plant short fiber tensile test specimen according to claim 1, characterized in that: The vertical cross section of the resin slot hole is arc-shaped, and the diameter of the resin slot hole is 0.03-0.1 mm.

3. A sample preparation device for a plant short fiber tensile test specimen according to claim 1, characterized in that: The vertical section of the connecting groove is arc-shaped, and the diameter of the connecting groove is 0.01-0.05 mm.

4. A sample preparation device for a plant short fiber tensile test specimen according to claim 1, characterized in that: A scale is provided on the bottom plate.

5. A sample preparation device for a plant short fiber tensile test specimen according to claim 1, characterized in that: The resin slot holes and the connection slots are formed on the bottom plate by laser drilling.

6. An application method of a sample preparation device for plant short fiber tensile test specimens, characterized in that: The application method adopts a sample preparation device for a plant short fiber tensile specimen according to any one of claims 1 to 5; the method comprises the following steps: Place a single plant short fiber into the connection groove using tweezers; Adjust the single plant short fiber to coincide with the center connecting line of the two resin tank holes; Use one end of the tweezers to absorb the resin and drop the absorbed resin into the two resin tank holes respectively until the two resin tank holes are filled with resin; If there is excess resin, absorb it through filter paper; After the resin is solidified, a single plant short fiber and the resin at both ends are taken out with tweezers to complete the preparation of the plant short fiber tensile specimen.

7. The application method of the device for preparing a sample of a plant short fiber tensile test specimen according to claim 6, characterized in that: The method for obtaining a single plant short fiber is as follows: using a deflaker to dilute and disperse the extracted plant short fibers, placing the dispersed plant short fibers evenly in a culture dish, and drying them to obtain a single plant short fiber.

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