Test piece for evaluating appearance performance of different engineering plastics under various product structures

Abstract

The utility model relates to a test piece (10) for evaluating the appearance performance of different engineering plastics under various product structures, the test piece (10) comprises at least two areas with different dermatoglyph, each area comprises a plane part (101) and a curved surface part (102), and the test piece (10) composed of the at least two areas is in the shape of a bowl with a through hole in the middle of the bottom. The test piece for evaluating the appearance performance of different engineering plastics under various product structures, disclosed by the utility model, has different surface structure characteristics, can be used for evaluating the influence of interaction of different structure characteristics on the appearance performance of a product, and does not need to be made into a plurality of test pieces with different structures when the appearance performance of a new material is evaluated; and the evaluation speed of the new material can be accelerated.

Description

Technical Field

[0001] The present disclosure relates to the technical field of engineering plastic injection molding, and in particular to a test piece for evaluating the appearance performance of different engineering plastics under various product structures. Background Art

[0002] This section provides background information related to the present application which does not necessarily constitute prior art.

[0003] At present, in the engineering plastics industry, many products have certain requirements not only for product functions but also for product appearance. Engineering plastics are generally filled with fillers, which will have a negative impact on the appearance of the product. In addition, not only some small functional products have this requirement, but more and more large products also have such a demand. Therefore, how to improve the appearance of engineering plastics is the research direction of most engineering plastics manufacturers.

[0004] However, in the entire engineering plastics industry, there are currently no unified standards and methods to evaluate the appearance of products.

[0005] Factors that affect the appearance of engineering plastic products involve factors such as product design and the type of engineering plastics. Product design is mainly affected by factors such as the thickness of the product surface leather grain, the design of the reinforcing ribs and screw columns, the weld line, the quality of exhaust, and the surface flatness. It is urgent to study how these factors interact with each other. Existing research methods often only consider the impact of a single factor on the appearance, and in order to test the appearance of new materials, it is often necessary to make test pieces with different structural characteristics to evaluate the appearance of a material under different structural characteristics, which is time-consuming, labor-intensive and costly. Utility Model Content

[0006]

[0010] This section provides a general summary of the disclosure, and is not a comprehensive disclosure of its full scope or all of its features.

[0007] An object of the present disclosure is to provide a test piece for evaluating the appearance performance of different engineering plastics under various product structures, wherein the test piece can be used to evaluate the appearance performance of a plastic product under the effect of at least two different structural features.

[0008] According to one aspect of the present disclosure, there is provided a test piece for evaluating the appearance performance of different engineering plastics in various product structures, the test piece comprising at least two areas with different leather grains, each area comprising a flat portion and a curved portion, and the test piece composed of the at least two areas is bowl-shaped with a through hole in the middle of the bottom.

[0009] In some examples according to the present disclosure, the specimen includes a first region, a second region, a third region, a fourth region, and a fifth region having different skin textures.

[0010] In some examples according to the present disclosure, the skin texture of the first area is mirror polished, the skin texture of the second area has a roughness of VDI15, the skin texture of the third area has a roughness of VID21, the skin texture of the fourth area has a roughness of VDI27, and the skin texture of the fifth area has a roughness of VDI33.

[0011] In some examples according to the present disclosure, the first region, the second region, the third region, the fourth region, and the fifth region are sector-shaped regions having the same size and shape.

[0012] In some examples according to the present disclosure, a plurality of reinforcing ribs are provided on the back side of the specimen.

[0013] In some examples according to the present disclosure, the reinforcing ribs include a plurality of annular reinforcing ribs arranged concentrically with the specimen and radially arranged straight reinforcing ribs connecting the plurality of annular reinforcing ribs.

[0014] In some examples according to the present disclosure, the annular reinforcing rib includes a first reinforcing rib, a second reinforcing rib, and a third reinforcing rib that are concentrically arranged and have different thicknesses.

[0015] In some examples according to the present disclosure, the linear reinforcement ribs include a fourth reinforcement rib connecting the first reinforcement rib and the second reinforcement rib and extending radially outward, a fifth reinforcement rib connecting the second reinforcement rib and the third reinforcement rib, and a sixth reinforcement rib extending radially from the third reinforcement rib toward the center of the specimen.

[0016] In some examples according to the present disclosure, threaded holes are provided at the connections between the planar portion and the curved portion on the first region, the second region, the third region, the fourth region, and the fifth region.

[0017] In some examples according to the present disclosure, a plurality of runners are disposed in the through hole of the specimen, and connection positions between the runners and the first region, the second region, the third region, the fourth region, and the fifth region are located at interfaces between different regions.

[0018] The test piece for evaluating the appearance performance of different engineering plastics under various product structures according to the present disclosure can at least achieve the following beneficial effects:

[0019] The test pieces disclosed by the utility model for evaluating the appearance performance of different engineering plastics under various product structures have different surface structural features, such as different leather grains, including both planes and curved surfaces, reinforcing ribs with different thicknesses, threaded holes at the connection between the planes and the curved surfaces, etc., and can be used to evaluate the influence of the interaction of different structural features on the appearance performance of the product. When evaluating the appearance performance of new materials, there is no need to make a plurality of test pieces with different structures, which is conducive to speeding up the evaluation of new materials. In addition, by using different materials to make the test pieces of this embodiment, the appearance of the test pieces of different materials is evaluated, and the appearance performance of products of different materials under the same structure is obtained, which is conducive to establishing an evaluation benchmark for the appearance performance of different materials. And the evaluation of the appearance performance of products of different materials and different structural characteristics can be realized through a set of molds, which saves costs.

[0020] The above and other objects, features and advantages of the present disclosure will be more fully understood from the detailed description given hereinafter and the accompanying drawings which are given by way of illustration only and thus are not to be considered as limiting the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The features and advantages of one or more embodiments of the present disclosure will become more easily understood through the following description with reference to the accompanying drawings, in which:

[0022] Figure 1 It is a front view of a test piece for evaluating the appearance performance of different engineering plastics under various product structures according to an embodiment of the utility model;

[0023] Figure 2 For along Figure 1 A cross-sectional view of the test piece cut along line AA, wherein the runner is not shown;

[0024] Figure 3 for Figure 1 Rear view of the specimen;

[0025] Figure 4 Schematic diagram of an injection molding machine used to manufacture the test pieces of this embodiment. DETAILED DESCRIPTION

[0026] The present disclosure will be described in detail below by way of exemplary embodiments with reference to the accompanying drawings. In several figures, similar reference numerals represent similar parts and assemblies. The following detailed description of the present disclosure is for illustrative purposes only and is by no means a limitation of the present disclosure and its application or use. The embodiments described in this specification are not exhaustive, but are only some of a plurality of possible embodiments. The exemplary embodiments may be implemented in many different forms and should not be construed as limiting the scope of the present disclosure. In some exemplary embodiments, well-known processes, well-known device structures, and well-known technologies may not be described in detail.

[0027] Figure 1 A plan view of a test piece 10 (hereinafter referred to as "test piece 10") for evaluating the appearance performance of different engineering plastics in various product structures according to an embodiment of the present invention is depicted. The test piece 10 is made of plastic by injection molding. The test piece 10 includes at least two regions with different skin grains (i.e., surface texture patterns), such as Figure 2 As shown, each region includes a flat portion 101 and a curved portion 102, and the test piece 10 consisting of at least two regions is in a bowl shape with a through hole in the middle of the bottom.

[0028] like Figure 1 As shown, in a preferred embodiment of the present invention, the test piece 10 includes five regions with different skin grains. The five regions are fan-shaped regions with the same size and shape, and the five regions together form a bowl-shaped test piece 10.

[0029] It should be noted that the plastics mentioned in the present invention are engineering plastics materials known in the art.

[0030] The test piece 10 of the present invention is injection molded by a mold to obtain a test piece with at least two areas with different skin textures. The appearance of the test piece 10 under different skin textures is compared and evaluated by using a surface gloss meter, a microscope or a scanning electron microscope, so that the influence of the interaction of different factors on the product appearance can be evaluated.

[0031] In this embodiment, the leather texture of the first area 1 is mirror polished, the leather texture of the second area 2 has a roughness of VDI15, the leather texture of the third area 3 has a roughness of VID21, the leather texture of the fourth area 4 has a roughness of VDI27, and the leather texture of the fifth area 5 has a roughness of VDI33.

[0032] Furthermore, in order to evaluate the effect of the reinforcement on the product appearance, e.g. Figure 3 As shown, a plurality of reinforcing ribs are provided on the back of the specimen 10, and the reinforcing ribs include a plurality of annular reinforcing ribs arranged concentrically with the specimen and radially arranged straight reinforcing ribs connecting the plurality of annular reinforcing ribs.

[0033] Preferably, if Figure 3As shown, the annular reinforcing ribs include a first reinforcing rib 11, a second reinforcing rib 12 and a third reinforcing rib 13 which are arranged concentrically and have different thicknesses, and the linear reinforcing ribs include a fourth reinforcing rib 14 which connects the first reinforcing rib 11 and the second reinforcing rib 12 and extends radially outward (away from the center of the specimen), a fifth reinforcing rib 15 which connects the second reinforcing rib 12 and the third reinforcing rib 13, and a sixth reinforcing rib 16 which extends radially from the third reinforcing rib 13 toward the center of the specimen 10. In particular, each of the fourth reinforcing rib 14, the fifth reinforcing rib 15 and the sixth reinforcing rib 16 is provided in plurality along the circumference of the specimen 10 and the positions correspond one to one.

[0034] In this embodiment, the thickness of the first reinforcing rib 11 and the fourth reinforcing rib 14 is 35% of the wall thickness of the specimen 10, the thickness of the second reinforcing rib 12 and the fifth reinforcing rib 15 is 50% of the wall thickness of the specimen 10, and the thickness of the third reinforcing rib 13 and the sixth reinforcing rib 16 is 70% of the wall thickness of the specimen 10. By arranging reinforcing ribs of different thicknesses on the specimen 10, the influence of the interaction of different skin patterns and reinforcing ribs on the appearance of the product can be evaluated.

[0035] Furthermore, if Figure 1 As shown, a plurality of runners 6 are provided in the middle area of ​​the specimen 10, and the connection position between the runner 6 and each area of ​​the specimen 10 is located at the interface between different areas, so that a weld line is formed in the middle position of each area during injection molding of the specimen 10, thereby being able to evaluate the appearance performance of the specimen 10 under the influence of the weld line and different skin textures.

[0036] Furthermore, if Figure 2 and Figure 3 As shown, each region is further provided with a threaded hole 7 at the connection between the plane portion 101 and the curved portion 102, so that the appearance of the test piece 10 under the combined effects of the threaded hole 7, different skin grains, and the plane and curved surfaces can be evaluated.

[0037] Exemplarily, the test piece 10 of this embodiment uses Figure 4 The injection molding machine 100 shown is used for injection molding. The injection molding process of the test piece 10 of the present application is briefly described below.

[0038] like Figure 4 As shown, the injection molding machine 100 includes an injection unit 20 and a clamping unit 30, and a mold 31 is installed between a stationary pressure plate 32 and a movable pressure plate 33 of the clamping unit 30. The movable pressure plate 33 is connected to a clamping cylinder 34. After the mold 31 is installed, the clamping cylinder 34 drives the movable pressure plate 33 to move, and clamps the mold 31 between the stationary pressure plate 32 and the movable pressure plate 33.

[0039] The injection unit 20 includes a hopper 21 and a barrel 22. The barrel 22 is connected to the gate of the mold 31 through a nozzle 25. The nozzle 25 delivers the raw material entering the barrel 22 from the hopper 21 into the mold 31 for molding. A screw 23 is provided in the barrel 22. The screw 23 is connected to a screw cylinder 26. The screw cylinder 26 drives the screw 23 to rotate, thereby transporting the raw material entering the barrel 22 along the barrel 22 toward the nozzle 25. A heater 24 is provided outside the barrel 22. The heater 24 can maintain the temperature in the barrel 22 at a set temperature, so that the raw material is in a flowing state before entering the mold 31.

[0040] When injecting the test piece 10 of this embodiment, first open the exhaust passage of the injection molding machine 100, set the temperature of the barrel 22 to 270 degrees Celsius, pour the engineering plastic raw material into the hopper 21, and pour 185 cubic centimeters of raw material. Set the temperature of the mold 31 to 80 degrees Celsius, and the injection molding machine 100 closes the mold 31 with a clamping force of 300 tons; set the speed of the screw 23 to 0.1 meters per minute, and the injection unit 20 starts to eject the raw material at the set speed; when the amount of ejected raw material reaches 170 cubic centimeters, the injection unit 20 switches to pressure holding; after the pressure holding ends, the injection unit 20 starts the metering action; keep the mold closing state for 5-10 seconds, at which time, the product in the mold cavity of the mold 31 cools and solidifies; after opening the mold 31 to the specified position, take out the product. At this point, an injection molding process is completed, and the test piece 10 of this embodiment is obtained.

[0041] Compared with the prior art, the test pieces disclosed in the utility model for evaluating the appearance performance of different engineering plastics under various product structures have different surface structural features, such as different leather grains, both planes and curved surfaces, reinforcing ribs with different thicknesses, threaded holes at the connection between the planes and the curved surfaces, etc., and can be used to evaluate the influence of the interaction of different structural features on the appearance performance of the product. When evaluating the appearance performance of new materials, there is no need to make multiple test pieces with different structures, which is conducive to speeding up the evaluation of new materials. In addition, by using different materials to make the test pieces of this embodiment, the appearance of the test pieces of different materials is evaluated, and the appearance performance of products of different materials under the same structure is obtained, which is conducive to establishing an evaluation benchmark for the appearance performance of different materials. And the evaluation of the appearance performance of products of different materials and different structural characteristics can be achieved through a set of molds, saving costs.

[0042] Although the present disclosure has been described with reference to exemplary embodiments, it should be understood that the present disclosure is not limited to the specific embodiments described and shown in detail herein. Those skilled in the art may make various changes to the exemplary embodiments without departing from the scope defined by the claims. In the absence of contradiction, the features of the various embodiments may be combined with each other. Alternatively, a feature in the embodiment may be omitted.

Claims

1. A test piece (10) for evaluating the appearance of different engineering plastics in various product structures, the test piece (10) comprising at least two regions with different skin textures, each region comprising a flat surface portion (101) and a curved surface portion (102), the test piece (10) consisting of the at least two regions being in the shape of a bowl with a through hole in the middle of the bottom.

2. The test piece (10) according to claim 1, It is characterized in that The test piece (10) comprises a first region (1), a second region (2), a third region (3), a fourth region (4) and a fifth region (5) having different skin textures.

3. The test piece (10) according to claim 2, It is characterized in that The leather grain of the first area (1) is mirror polished, the leather grain of the second area (2) has a roughness of VDI15, the leather grain of the third area (3) has a roughness of VID21, the leather grain of the fourth area (4) has a roughness of VDI27, and the leather grain of the fifth area (5) has a roughness of VDI33.

4. The test piece (10) according to claim 2 or 3, It is characterized in that The first region (1), the second region (2), the third region (3), the fourth region (4) and the fifth region (5) are fan-shaped regions with the same size and shape.

5. The test piece (10) according to claim 4, It is characterized in that The back side of the test piece (10) is provided with a plurality of reinforcing ribs.

6. The test piece (10) according to claim 5, It is characterized in that The reinforcing ribs include a plurality of annular reinforcing ribs arranged concentrically with the test piece (10) and radially arranged straight reinforcing ribs connecting the plurality of annular reinforcing ribs.

7. The test piece (10) according to claim 6, Features The annular reinforcing ribs include a first reinforcing rib (11), a second reinforcing rib (12) and a third reinforcing rib (13) which are concentrically arranged and have different thicknesses.

8. The test piece (10) according to claim 7, It is characterized in that The linear reinforcing ribs include a fourth reinforcing rib (14) connecting the first reinforcing rib (11) and the second reinforcing rib (12) and extending radially outward, a fifth reinforcing rib (15) connecting the second reinforcing rib (12) and the third reinforcing rib (13), and a sixth reinforcing rib (16) extending radially from the third reinforcing rib (13) toward the center of the specimen (10).

9. The test piece (10) according to any one of claims 2-3, 5-8, It is characterized in that Threaded holes (7) are provided on the first region (1), the second region (2), the third region (3), the fourth region (4) and the fifth region (5) at the connection between the planar portion (101) and the curved portion (102).

10. The test piece (10) according to any one of claims 2-3, 5-8, It is characterized in that A plurality of runners (6) are arranged in the through hole of the test piece (10), and the connection positions of the runners (6) and the first region (1), the second region (2), the third region (3), the fourth region (4) and the fifth region (5) are located at the interfaces of different regions.

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