Preparation method of fiber monofilament sample

Abstract

The invention relates to the technical field of composite materials, in particular to a preparation method of a fiber monofilament sample, which comprises the following steps: placing a fiber monofilament on a bearing sheet, the melting point of the bearing sheet being smaller than that of the fiber monofilament; the bearing pieces close to the two ends of the fiber monofilament are heated, the bearing pieces at the two ends of the fiber monofilament are melted and infiltrate the two ends of the fiber monofilament, and the fiber monofilament is fixed after cooling; and cutting the bearing sheet to obtain a fiber monofilament sample. By means of the design, damage and even brittle failure of the fiber monofilament in the pasting process are avoided, the integrity of the surface of the fiber monofilament is guaranteed, and then the accuracy of the result when a fiber monofilament sample is adopted for testing is improved; in addition, the fixing mode is simple, and the sample preparation efficiency is improved.

Description

Technical Field

[0001] The present application relates to the technical field of composite materials, and in particular to a method for preparing a fiber monofilament sample. Background Art

[0002] Fiber monofilament is a single filament with a smaller count produced by a single-hole spinneret in the production of chemical fibers. Mechanical property testing of fiber monofilament can better reflect the mechanical properties of the fiber itself. Before mechanical property testing, the fiber monofilament needs to be pasted on a reinforcement sheet to prepare a fiber monofilament sample.

[0003] However, fiber monofilaments are more fragile and easy to break than fiber multifilaments. When using adhesives to fix the fiber monofilaments, the fiber monofilaments are easily damaged, and the preparation efficiency is low. Therefore, there is an urgent need for a preparation method for fiber monofilament samples that has high preparation efficiency and is not easy to damage the fiber monofilaments. Summary of the invention

[0004] In order to solve the above technical problems, the present application provides a method for preparing a fiber monofilament sample, which improves the sample preparation efficiency and reduces the probability of damage.

[0005] According to a first aspect of an embodiment of the present application, a method for preparing a fiber monofilament sample is provided, which comprises:

[0006] placing the fiber monofilament on a carrier sheet, wherein the melting point of the carrier sheet is lower than the melting point of the fiber monofilament;

[0007] The support sheets near the two ends of the fiber monofilament are heated, so that the support sheets at the two ends of the fiber monofilament are melted and wet the two ends of the fiber monofilament, and the fiber monofilament is fixed after cooling;

[0008] The carrier sheet is cut to obtain a fiber monofilament sample.

[0009] In some embodiments of the present application, when the carrier sheet is heated, the thickness of the melted portion is less than the total thickness of the carrier sheet.

[0010] In some embodiments of the present application, the length of the fiber monofilament is slightly greater than the target length of the fiber monofilament sample.

[0011] In some embodiments of the present application, placing the fiber monofilament on the carrier sheet includes:

[0012] The fiber tow is placed on the carrier sheet, the fiber tow is dispersed, and the portion of the fiber tow that is not dispersed into the fiber monofilaments is removed, and the remaining fiber monofilaments are distributed on the carrier sheet at intervals.

[0013] In some embodiments of the present application, the fiber monofilaments are randomly distributed on the carrier sheet, and at least some of the fiber monofilaments extend in different directions.

[0014] In some embodiments of the present application, placing the fiber tow on the carrier sheet includes: arranging a first baffle and a second baffle on the carrier sheet with a spacing adapted to the length of the fiber monofilament, and placing the fiber tow on the carrier sheet between the first baffle and the second baffle;

[0015] The remaining fiber monofilaments are distributed on the carrier sheet at intervals, including: two ends of the remaining fiber monofilaments are in contact with the first baffle and the second baffle respectively.

[0016] In some embodiments of the present application, the carrier sheet is a polypropylene film.

[0017] In some embodiments of the present application, cutting the carrier sheet includes: cutting the carrier sheet according to the contour of the fixed fiber monofilament.

[0018] In some embodiments of the present application, cutting the carrier sheet according to the contour of the fixed fiber monofilament includes: cutting the carrier sheet into a rectangular sheet structure having a length greater than the length of the fiber monofilament and a width greater than the width of the fiber monofilament.

[0019] In some embodiments of the present application, heating the support sheet near both ends of the fiber monofilament includes: using a heating device to heat the support sheet near both ends of the fiber monofilament, and the heating temperature of the heating device is adjustable.

[0020] The preparation method of the fiber monofilament sample provided in this application can achieve the following beneficial technical effects:

[0021] The preparation method of the fiber monofilament sample provided in the present application provides a carrier sheet with a melting point lower than that of the fiber monofilament, and heats the carrier sheet near the two ends of the fiber monofilament so that the carrier sheet melts and infiltrates the two ends of the fiber monofilament and then solidifies, thereby achieving the fixation of the fiber monofilament on the carrier sheet, avoiding damage or even brittle breakage of the fiber monofilament in the process of using other adhesives to stick the fiber monofilament, ensuring the integrity of the fiber monofilament surface, and further improving the accuracy of the test results when using the fiber monofilament sample; in addition, the fixing method is simple, which improves the sample preparation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings herein are incorporated into the specification and constitute a part of the specification to illustrate embodiments of the present application and are used together with the description to explain the principles of the present application. In these drawings, similar reference numerals are used to represent similar elements. The drawings described below are some embodiments of the present application, rather than all embodiments. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 It is a schematic flow chart of a method for preparing a fiber monofilament sample according to an embodiment of the present application;

[0024] Figure 2 It is a schematic flow chart of a method for preparing a fiber monofilament sample according to an embodiment of the present application;

[0025] Figure 3 1 is a top view of a fiber monofilament and a carrier sheet according to an embodiment of the present application.

[0026] Reference numerals:

[0027] 100, fiber monofilament; 200, carrier sheet; 300, first baffle; 400, second baffle. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application. It should be noted that, in the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other arbitrarily.

[0029] Mechanical experiments using fiber monofilament samples include, for example, interface shear strength tests and tensile strength tests. Testing the mechanical properties of fiber monofilaments can effectively avoid the effects of sizing agents and resins on the mechanical properties of fibers, and can better reflect the mechanical properties of the fibers themselves. The diameter of each fiber monofilament is only 5-8 microns. At present, when preparing fiber monofilament samples, adhesives such as tape and rosin are often used to fix the fiber monofilaments. The surface of the fiber monofilaments is easily damaged during the pasting process, and even the fiber monofilaments may break brittlely. In addition, the efficiency of the above pasting method is low.

[0030] In order to solve the above problems, the present application provides a method for preparing a fiber monofilament sample, wherein a carrier sheet with a melting point lower than that of the fiber monofilament is provided, and the carrier sheet near the two ends of the fiber monofilament is heated to melt the carrier sheet, wet the two ends of the fiber monofilament and then solidify, thereby achieving the fixation of the fiber monofilament on the carrier sheet, ensuring the integrity of the surface of the fiber monofilament, and thereby improving the accuracy of the test results when the fiber monofilament sample is used; in addition, the fixing method is simple, which improves the sample preparation efficiency.

[0031] The following is a detailed description of the method for preparing the fiber monofilament sample provided by the present application in conjunction with the accompanying drawings.

[0032] An exemplary embodiment of the present application provides a method for preparing a fiber monofilament sample, such as Figure 1 As shown, the method includes:

[0033] S100, placing the fiber monofilament on a carrier sheet, wherein the melting point of the carrier sheet is lower than the melting point of the fiber monofilament.

[0034] In this step, the melting point of the carrier sheet is lower than the melting point of the fiber monofilament. For example, if the fiber monofilament is a carbon fiber monofilament and the melting point of the carbon fiber is between 2500°C and 3000°C, then the melting point of the material of the carrier sheet should be lower than 2500°C. For example, a material with a melting point of 200°C to 300°C is selected to ensure that the fiber monofilament will not melt or deform when the carrier sheet is heated.

[0035] S200, heating the support sheets near the two ends of the fiber monofilament, so that the support sheets at the two ends of the fiber monofilament melt and soak the two ends of the fiber monofilament, and fixing the fiber monofilament after cooling.

[0036] In this step, the supporting sheets at both ends of the fiber monofilament are melted by heat into a colloidal state, and the two ends of the fiber monofilament are soaked. After soaking, the supporting sheets are cooled, and the colloidal supporting sheets are solidified again into a solid state, thereby achieving the fixation of the fiber monofilament.

[0037] S300, cutting the carrier sheet to obtain a fiber monofilament sample.

[0038] In the present embodiment, a carrier sheet having a melting point lower than that of the fiber monofilament is provided, and the carrier sheet near the two ends of the fiber monofilament is heated so that the carrier sheet melts and infiltrates the two ends of the fiber monofilament and then solidifies, thereby achieving the fixation of the fiber monofilament on the carrier sheet, avoiding damage or even brittle breakage of the fiber monofilament in the process of pasting the fiber monofilament with other adhesives, ensuring the integrity of the fiber monofilament surface, and further improving the accuracy of the test results when the fiber monofilament sample is used; in addition, the fixing method is simple, which improves the sample preparation efficiency.

[0039] In some embodiments, continue to refer to Figure 1When the carrier sheet in step S200 is heated, the melted thickness is less than the total thickness of the carrier sheet.

[0040] In this embodiment, the thickness of the melted carrier sheet can be controlled by controlling the heating time of the carrier sheet. By setting the melted thickness to be smaller than the total thickness of the carrier sheet, it is ensured that the carrier sheet does not drip during the melting process, thereby ensuring the integrity of the sample.

[0041] In some embodiments, the length of the fiber monofilament is slightly greater than the target length of the fiber monofilament sample. Since there are parts at both ends of the fiber monofilament that are fixed by the carrier sheet, the parts cannot be used for mechanical property testing, so the length of the fiber monofilament should be greater than the target length of the fiber monofilament sample; if the fiber monofilament is too long, further shearing is required, which will also increase the probability of damage to the fiber monofilament, so the length of the fiber monofilament is set to be slightly greater than the target length of the fiber monofilament sample.

[0042] In some embodiments, Figure 2 As shown, placing the fiber monofilament on the carrier sheet in step S100 specifically includes the following steps:

[0043] S110, placing the fiber bundle on a carrier sheet.

[0044] In this step, the fiber bundle composed of fiber monofilaments is spread on the carrier sheet. This step can be completed by a clamping tool to avoid damaging the fiber monofilaments, such as using tweezers.

[0045] S120, dispersing the fiber bundles.

[0046] In this step, the fiber bundles on the carrier sheet are dispersed, and at least a portion of the fiber bundles are dispersed into fiber monofilaments, while the other portion still exists in the form of smaller fiber bundles.

[0047] S130, removing part of the fiber bundle that has not been dispersed into fiber monofilaments, and distributing the remaining fiber monofilaments at intervals on the carrier sheet.

[0048] In this step, multiple fiber monofilaments that have not been removed are distributed at intervals on the carrier sheet; some fiber bundles that have not been dispersed into fiber monofilaments are removed. If too many fibers are dispersed into fiber monofilaments, resulting in overlap or small spacing between the fiber monofilaments, some of the fiber monofilaments can also be removed according to actual conditions, which will not be repeated here.

[0049] In the present embodiment, by removing a portion of the fiber bundles or fiber monofilaments after placing and dispersing the fiber bundles on the carrier sheet, there is no need to limit the position of the fiber monofilaments to be prepared as the sample, that is, the portion of the fiber monofilaments does not need to be moved during the entire process, that is, they will not be affected by external forces in the state of fiber monofilaments, which greatly reduces the probability of surface damage or even breakage, thereby ensuring the accuracy of the test results.

[0050] In some embodiments, continue to refer to Figure 2 After the fiber bundles are dispersed in step S120, the fiber monofilaments are randomly dispersed on the carrier sheet, wherein at least some of the fiber monofilaments have different extension directions, that is, the extension directions of the fiber monofilaments may be different, or there may be fiber monofilaments with the same extension direction, that is, there is no restriction on their extension direction.

[0051] In some embodiments, Figure 2 As shown, placing the fiber tow on the carrier sheet in step S110 includes:

[0052] S111, setting a first baffle and a second baffle with a spacing adapted to the length of the fiber monofilaments on the carrier sheet, and placing the fiber bundle on the carrier sheet between the first baffle and the second baffle.

[0053] like Figure 3 As shown, in this step, a first baffle 300 and a second baffle 400 are set perpendicular to the plane where the supporting sheet 200 is located. The first baffle 300 and the second baffle 400 extend along the x-axis direction and are separated by a set distance in the y-axis direction. The set distance is adapted to the length of the fiber monofilament 100. The adaptation here means that the set distance is equal to the length of the fiber monofilament 100 or the set distance is slightly larger than the length of the fiber monofilament 100.

[0054] The remaining fiber monofilaments in step S130 are distributed on the carrier sheet at intervals, including:

[0055] S131. Two ends of the remaining fiber monofilaments are in contact with the first baffle and the second baffle respectively.

[0056] In this step, continue to refer to Figure 3 , after placing the fiber bundle between the first baffle 300 and the second baffle 400, dispersing and removing it, the position of the remaining fiber monofilaments 100 needs to be adjusted so that the two ends of the fiber monofilaments 100 are in contact with the first baffle 300 and the second baffle 400 respectively. At this time, the intervals of the fiber monofilaments 100 in the x-axis direction can be equal or unequal, and it is only necessary to ensure that the two ends of the fiber monofilaments 100 are in contact with the first baffle 300 and the second baffle 400 respectively.

[0057] By setting the first baffle 300 and the second baffle 400 to limit the position of the fiber monofilament 100, when heating the supporting sheets 200 at both ends of the fiber monofilament 100, batch heating can be performed, that is, a heating device is used to heat the first ends of multiple fiber monofilaments 100 at the same time, and the second ends of multiple fiber monofilaments 100 are heated at the same time, which further improves the efficiency of preparing fiber monofilament 100 samples.

[0058] In some embodiments, the carrier sheet is a polypropylene film with a thickness ranging from 1 to 3 mm. The polypropylene material has the advantages of being lightweight, chemically stable, environmentally friendly and non-toxic, ensuring the wear and corrosion resistance of the fiber monofilament sample and reducing the preparation cost of the fiber monofilament sample.

[0059] In some embodiments, Figure 1 As shown, cutting the carrier sheet in step S300 includes:

[0060] S310, cutting the carrier sheet according to the contour of the fixed fiber monofilament.

[0061] In this step, the position to be cut can be pre-marked on the carrier sheet according to the contour of the fiber, and then the carrier sheet can be cut, thereby ensuring accurate cutting.

[0062] In some embodiments, step S310 specifically includes the following steps:

[0063] S311, cutting the carrier sheet into a rectangular sheet structure with a length greater than the length of the fiber monofilament and a width greater than the width of the fiber monofilament.

[0064] In this step, by cutting the carrier sheet into a rectangular sheet structure with a length greater than the length of the fiber monofilament and a width greater than the width of the fiber monofilament, the cut carrier sheet can provide better protection and reinforcement effects on the fiber monofilament. For example, for a fiber monofilament with a length of 4 cm, a rectangular fiber monofilament sample with a length of 5 cm and a width of 3 cm can be cut. Those skilled in the art can select the length and width of the rectangular sheet structure according to actual needs, and no limitation is made here.

[0065] In some embodiments, when using the fiber monofilament sample in the present application to perform mechanical property experiments, the support sheet can be cut a second time, for example, the support sheet located in the middle section of the fiber monofilament is cut off, and only the support sheets at the two ends of the fiber monofilament are retained.

[0066] In some embodiments, Figure 1As shown, heating the carrier sheet near both ends of the fiber monofilament in step S200 includes: using a heating device to heat the carrier sheet near both ends of the fiber monofilament, and the heating temperature of the heating device is adjustable. The heating device is, for example, an electric soldering iron, which can perform local heating through the end and heat a long section of the carrier sheet through the side, is easy to operate, heats up quickly, and is also convenient for the operator to control the heating time (i.e., the contact time with the carrier sheet).

[0067] In some embodiments, when the heating device heats the carrier sheet, it can heat the carrier sheet near one end of the fiber monofilament but not contact the fiber monofilament, or it can directly contact one end of the fiber monofilament for heating. Since the melting point of the fiber monofilament is greater than or even much greater than the melting point of the carrier sheet, the fiber monofilament will not melt or change in properties during the heating process. Operators in this field can also choose other heating methods, all of which are within the scope of protection of the present application.

[0068] In some embodiments, when both ends of the fiber monofilament have been soaked and are about to be completely solidified, two pressure plates can be set at both ends of the fiber monofilament. Such a design can ensure the flatness of the fiber monofilament sample and facilitate clamping during subsequent testing.

[0069] The preparation method of the fiber monofilament sample provided in the present application realizes the fixation of the fiber monofilament on the supporting sheet by setting a supporting sheet with a melting point lower than that of the fiber monofilament, heating the supporting sheets close to the two ends of the fiber monofilament, so that the supporting sheet melts and infiltrates the two ends of the fiber monofilament and then solidifies; in addition, there is no need to strictly limit the position of the fiber monofilament when placing the fiber monofilament, thereby avoiding damage or even brittle breakage of the fiber monofilament during the process of pasting the fiber monofilament with other adhesives or moving the fiber monofilament, ensuring the integrity of the fiber monofilament surface, and thus improving the accuracy of the test results when using the fiber monofilament sample; in addition, the heating and fixing methods are simple, which improves the sample preparation efficiency.

[0070] The contents described above may be implemented individually or in combination in various ways, and these variations are all within the protection scope of this application.

[0071] It should be noted that, in the description of the present application, the terms "upper", "lower", "front", "back", etc., indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present application.

[0072] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0073] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0074] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0075] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0076] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A method for preparing a fiber monofilament sample, characterized in that: include: placing the fiber monofilament on a carrier sheet, wherein the melting point of the carrier sheet is lower than the melting point of the fiber monofilament; The support sheets near the two ends of the fiber monofilament are heated, so that the support sheets at the two ends of the fiber monofilament are melted and wet the two ends of the fiber monofilament, and the fiber monofilament is fixed after cooling; The carrier sheet is cut to obtain a fiber monofilament sample.

2. The method for preparing a fiber monofilament sample according to claim 1, characterized in that: When the carrier sheet is heated, the thickness of the melted portion is smaller than the total thickness of the carrier sheet.

3. The method for preparing a fiber monofilament sample according to claim 1, characterized in that: The length of the fiber monofilament is slightly greater than the target length of the fiber monofilament sample.

4. The method for preparing a fiber monofilament sample according to claim 1, characterized in that: Placing the fiber monofilaments on the carrier sheet comprises: The fiber tow is placed on the carrier sheet, the fiber tow is dispersed, and the portion of the fiber tow that is not dispersed into the fiber monofilaments is removed, and the remaining fiber monofilaments are distributed on the carrier sheet at intervals.

5. The method for preparing a fiber monofilament sample according to claim 4, characterized in that: The fiber monofilaments are randomly distributed on the carrier sheet, and at least some of the fiber monofilaments extend in different directions.

6. The method for preparing a fiber monofilament sample according to claim 4, characterized in that: Placing the fiber bundle on the carrier sheet comprises: arranging a first baffle and a second baffle on the carrier sheet with a spacing adapted to the length of the fiber monofilament, and placing the fiber bundle on the carrier sheet between the first baffle and the second baffle; The remaining fiber monofilaments are distributed on the carrier sheet at intervals, including: two ends of the remaining fiber monofilaments are in contact with the first baffle and the second baffle respectively.

7. The method for preparing a fiber monofilament sample according to claim 1, characterized in that: The carrier sheet is a polypropylene film.

8. The method for preparing a fiber monofilament sample according to claim 1, characterized in that: The cutting of the carrier sheet includes: cutting the carrier sheet according to the contour of the fixed fiber monofilament.

9. The method for preparing a fiber monofilament sample according to claim 8, characterized in that: The cutting of the carrier sheet according to the contour of the fixed fiber monofilament comprises: cutting the carrier sheet into a rectangular sheet structure having a length greater than the length of the fiber monofilament and a width greater than the width of the fiber monofilament.

10. The method for preparing a fiber monofilament sample according to claim 1, characterized in that: The step of heating the support sheet near the two ends of the fiber monofilament comprises: using a heating device to heat the support sheet near the two ends of the fiber monofilament, wherein the heating temperature of the heating device is adjustable.

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