Testing Device and Testing Method for Creep Resistance Performance of a Sealing Tape

Abstract

The present invention provides a test device and a test method for the anti-creep performance of a sealing tape. The test device includes a heating platform. A support block is arranged on the surface of the heating platform. At least one layer of breathable felt is coated on the surface of the support block. A vacuum suction nozzle is arranged on the breathable felt. The vacuum suction nozzle is externally connected to a vacuum pump. The sealing tape to be tested is pasted along the four peripheral edges of the heating platform. A vacuum bag film is covered above the heating platform. The four peripheral edges of the vacuum bag film are pasted on the sealing tape so that a sealed space is formed between the vacuum bag film and the heating platform. The support block is located in the sealed space. The sealed space is evacuated by the vacuum pump. The present invention can test the anti-creep ability of the tape in different temperature ranges and different molecular states from room temperature to high temperature, from viscous flow state to crosslinked state, and provide a certain basis for the use means of the tape in actual production and use.

Description

Technical Field

[0001] The present invention belongs to the technical field of testing instruments, and relates to a testing device and a testing method for the anti-creep performance of a sealing tape. Background Art

[0002] A tape is a strip-shaped artificial product with adhesiveness, which can be adhered to the surface of some articles and is used for connecting two different articles or as a kind of screen wall or protection. Tapes can be classified according to their functions into high-temperature tapes, insulating tapes, sealing tapes, etc., among which sealing tapes are crucial in the aerospace field.

[0003] In the aerospace field, many composite material components are manufactured by the autoclave molding process. This autoclave molding process refers to evacuating negative pressure, applying positive pressure and heating in a sealed system to meet the curing requirements of structural components. This sealed system often uses a sealing tape to bond a vacuum bag and a mold to form a closed system, which is placed in an autoclave and continuously evacuated to cure the prepreg. As the temperature in the autoclave rises and the pressure increases, the sealing tape gradually changes to a viscous flow state and undergoes a certain amount of creep, and the width and thickness of the tape change. During this change process, if the anti-creep ability of the tape is weak, it is very likely that the tape will flow on the surface of the mold tooling, thereby affecting the bonding strength between the tape and the mold and between the tape and the film. Under the action of external pressure, it is extremely easy to form an air channel, and an effective sealed vacuum curing environment cannot be achieved, affecting the product quality. Therefore, for a sealing tape, in addition to requiring good adhesiveness, it also needs to have excellent anti-creep characteristics. The anti-creep ability of a sealing tape is most intuitively reflected by the size of the width displacement change of the sealing tape before and after evacuating the vacuum at normal temperature or variable temperature conditions.

[0004] CN 209460172 U discloses a tape high-temperature vacuum testing device with convenient operation, including a water bath tank. A baffle is fixedly installed on the outer surface of the top of the water bath tank near one side through bolts, and a water bath barrel is fixedly installed at the center of the bottom outer surface of the baffle. A support mechanism is movably installed on the inner surface of the water bath barrel, and a vacuum pumping mechanism is arranged on one side of the water bath tank close to the water bath barrel. First, this utility model can evacuate the air inside the glass bottle and detect whether the tape debonds in a vacuum. The overall structure is simple and the operation is convenient. Second, it can more freely adjust the height of the glass bottle during the water bath, and at the same time facilitate the sealing of the water bath barrel, improve the stability of the water bath, and can better control the temperature of the water bath, bringing better application prospects.

[0005] CN 210834618 U discloses a testing instrument for the adhesiveness of a sealing tape under different temperature and humidity conditions, which includes a housing. Above the housing, a testing platform and a lifting driving device are respectively arranged. The lifting driving device is connected to the testing platform. On the testing platform, there are a fixing block for fixing a nylon bag film on its upper part and a testing wheel for fixing the sealing tape. At the bottom of the housing, a heating device and a humidifying device are respectively arranged and connected to a power supply. The testing instrument of this utility model has a simple structure and is convenient to operate, and can accurately test the adhesiveness between the sealing tape and the vacuum bag film under different temperature and humidity conditions.

[0006] CN 110658078 A discloses a biaxial load adjustable tensile creep testing device and method, especially a testing method and device for the biaxial tensile creep of viscoelastic materials such as rubber, asphalt, and solid propellants. It includes a support frame. At the bottom of the support frame, there is a base and a support assembly. A tensile assembly is connected to the support assembly and is connected to a measuring assembly to test a specimen, which can ensure that a biaxial tensile specimen with controllable stress in the middle calculation area undergoes a biaxial tensile creep experiment under biaxial tension. The measurement method is simple, the cost is extremely low, and it is stable.

[0007] In summary, the prior art discloses a testing device for testing a tape in a vacuum water bath heating, a device for detecting the adhesiveness of a tape, and a biaxial load adjustable tensile creep testing device and method for viscoelastic materials. However, in the field of unvulcanized rubber products, there is no relevant testing equipment and technology for the creep resistance of a sealing tape. Therefore, when inspectors conduct in-and-out factory performance inspections on the sealing tape, they cannot timely determine whether the sealing tape meets the production requirements through the creep resistance of the tape, which poses certain potential safety hazards. For example, if the creep resistance of the tape is poor, during the use in the workshop, there will be a certain amount of air leakage in the vacuum bag, and it is not easy to remove the residual rubber on the surface of the mold tooling, bringing certain uncontrollable risks to the final product quality. Therefore, in view of the deficiencies of the prior art, it is necessary to develop a set of testing device and method with reasonable design, simple structure, convenient operation, and capable of accurately and quickly detecting the creep resistance characteristics of a sealing tape at different temperatures. Summary of the Invention

[0008] Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide a testing device and a testing method for the creep resistance performance of a sealing tape, which can accurately and quickly detect the creep resistance characteristics of the sealing tape at different temperatures.

[0009] To achieve this purpose, the present invention adopts the following technical solutions:

[0010] In a first aspect, the present invention provides a test device for the anti-creep performance of a sealing tape. The test device includes a heating platform, on the surface of which there are support blocks, and at least one layer of breathable felt is wrapped on the surface of the support blocks. There are vacuum suction nozzles on the breathable felt, and the vacuum suction nozzles are externally connected to a vacuum pump. The sealing tape to be tested is pasted along the four peripheral edges of the heating platform. A vacuum bag film is covered above the heating platform, and the four peripheral edges of the vacuum bag film are pasted on the sealing tape so that a sealed space is formed between the vacuum bag film and the heating platform. The support blocks are located in the sealed space, and the sealed space is evacuated by the vacuum pump.

[0011] In the present invention, the vacuum pump continuously evacuates the vacuum bag closed system, and the heating platform performs a heating operation. When the set temperature is reached, timing starts. The vacuum pump continuously evacuates through the vacuum suction nozzles and the support blocks wrapped with breathable felt. After the test time ends, the width change of the sealing tape at this time is measured. The change in the width of the tape before and after heating can characterize the magnitude of the deformation of the sealing tape under the action of temperature and internal pressure, that is, the anti-creep ability. At the same time, the presence of the support blocks provides harsh conditions during the evacuation of the tape. During the evacuation process, the pressure of the vacuum bag film on the sealing tape is increased. The purpose of wrapping the breathable felt on the surface of the support blocks is to facilitate the rapid evacuation of the gas in the sealed space by using the breathable performance of the breathable felt. The test device of the present invention can test the anti-creep ability of the sealing tape in different temperature ranges and different molecular states from room temperature to high temperature, from viscous flow state to crosslinked state, and provides a certain basis for the use of the tape in actual production.

[0012] As a preferred technical solution of the present invention, the visible surface area of the heating platform and the support blocks exposed to the outside is smaller than the area of the vacuum bag film.

[0013] It should be noted that the visible surface area of the heating platform and the support blocks exposed to the outside consists of two parts. One part is the area of the heating platform surface exposed (excluding the contact area between the heating platform and the support blocks), and the other part is the exposed surface area of the support blocks (excluding the contact area between the heating platform and the support blocks). The reason why the present invention requires the visible surface area of the heating platform and the support blocks exposed to the outside to be smaller than the area of the vacuum bag film is that after evacuation, the vacuum bag film needs to completely wrap the exposed surfaces of the support blocks and the heating platform. In order to ensure that the vacuum bag film will not be damaged, the area of the vacuum bag film needs to be slightly larger. In addition, before evacuation, when the vacuum bag film is pasted to the sealing tape, a part of the fold needs to be reserved at the pasting place of the vacuum bag film. For example, the edge of the vacuum bag film can be folded inward and then pasted to the sealing tape, so that there is an extra part of the vacuum bag film around the heating platform.

[0014] There are folds for the deformation of the vacuum bag film at the pasting place of the vacuum bag film and the four peripheral edges of the heating platform.

[0015] Preferably, the length of the vacuum bag film is 500 - 800 mm. For example, it can be 500 mm, 525 mm, 550 mm, 575 mm, 600 mm, 625 mm, 650 mm, 675 mm, 700 mm, 725 mm, 750 mm, 775 mm, 800 mm, but is not limited to the listed values. Other unlisted values within this range are equally applicable.

[0016] Preferably, the width of the vacuum bag film is 500 - 800 mm. For example, it can be 500 mm, 525 mm, 550 mm, 575 mm, 600 mm, 625 mm, 650 mm, 675 mm, 700 mm, 725 mm, 750 mm, 775 mm, 800 mm, but is not limited to the listed values. Other unlisted values within this range are equally applicable.

[0017] As a preferred technical solution of the present invention, the testing device further includes a moving base, and the heating platform is detachably fixed on the moving base.

[0018] Preferably, universal wheels are provided on the bottom surface of the moving base.

[0019] Preferably, the vacuum suction nozzle is externally connected to a vacuum pump through a vacuum tube.

[0020] Preferably, the support block is located at the center of the heating platform.

[0021] Preferably, the support block is detachably fixed to the heating platform.

[0022] It should be noted that the connection between the support block and the heating platform is non-fixed, which is convenient for replacing the air-permeable felt with different air permeability specifications.

[0023] Preferably, 1 - 3 layers of air-permeable felt are coated on the surface of the support block. For example, it can be 1 layer, 2 layers, 3 layers, but is not limited to the listed values. Other unlisted values within this range are equally applicable.

[0024] As a preferred technical solution of the present invention, the support block is in a cuboid structure.

[0025] It should be noted that the present invention does not make specific requirements and special limitations on the structural features such as the size, shape, and material of the support block. The role of the support block in the present invention is to provide harsh conditions during the vacuum pumping process of the sealing tape and increase the pressure of the vacuum bag film on the sealing tape. Therefore, it can be understood that other block-shaped objects that can achieve such functions can be used in the present invention, and those skilled in the art can adaptively adjust the size, shape, or material of the support block according to the use scenario and test conditions.

[0026] Preferably, the length of the support block is 300 - 500 mm, for example, it can be 300 mm, 325 mm, 350 mm, 375 mm, 400 mm, 425 mm, 450 mm, 475 mm, 500 mm, but not limited to the listed values, and other unlisted values within this range are equally applicable.

[0027] Preferably, the width of the support block is 300 - 500 mm, for example, it can be 300 mm, 325 mm, 350 mm, 375 mm, 400 mm, 425 mm, 450 mm, 475 mm, 500 mm, but not limited to the listed values, and other unlisted values within this range are equally applicable.

[0028] Preferably, the height of the support block is 200 - 300 mm, for example, it can be 200 mm, 210 mm, 220 mm, 230 mm, 240 mm, 250 mm, 260 mm, 270 mm, 280 mm, 290 mm, 300 mm, but not limited to the listed values, and other unlisted values within this range are equally applicable.

[0029] Preferably, the volume of the support block is 50 - 80% of the volume of the sealed space before evacuation, for example, it can be 50%, 53%, 55%, 57%, 60%, 63%, 65%, 67%, 70%, 73%, 75%, 77%, 80%, but not limited to the listed values, and other unlisted values within this range are equally applicable.

[0030] As a preferred technical solution of the present invention, the length of the heating platform is 800 - 1000 mm, for example, it can be 800 mm, 820 mm, 840 mm, 860 mm, 880 mm, 900 mm, 920 mm, 940 mm, 960 mm, 980 mm, 1000 mm, but not limited to the listed values, and other unlisted values within this range are equally applicable.

[0031] Preferably, the width of the heating platform is 800 - 1000 mm, for example, it can be 800 mm, 820 mm, 840 mm, 860 mm, 880 mm, 900 mm, 920 mm, 940 mm, 960 mm, 980 mm, 1000 mm, but not limited to the listed values, and other unlisted values within this range are equally applicable.

[0032] Preferably, the thickness of the heating platform is 2 - 4 mm, for example, it can be 2 mm, 3 mm, 4 mm, but not limited to the listed values, and other unlisted values within this range are equally applicable.

[0033] Preferably, the material of the heating platform is No. 36 steel.

[0034] It should be noted that the present invention does not make specific requirements and special limitations on the material of the heating platform. The role of the heating platform in the present invention is to provide a tooling material close to that used in the actual autoclave process production, and a platform with good thermal conductivity to meet the needs of the test device. Therefore, it can be understood that other materials that can achieve such functions can be used in the present invention, and those skilled in the art can make adaptive adjustments according to the material requirements of the use scenario and test conditions.

[0035] As a preferred technical solution of the present invention, a heater and a temperature sensor are arranged in the heating platform.

[0036] Preferably, the heater is an electric heater.

[0037] Preferably, an operation panel is arranged on one side surface of the moving base, and the operation panel is used to adjust the heating temperature of the heater and the running time of the vacuum pump.

[0038] As a preferred technical solution of the present invention, the operation panel includes a control module. The temperature sensor is electrically connected to the control module. The control module feedback-controls the heater. The control module receives the real-time temperature data transmitted by the temperature sensor, makes a logical comparison according to the real-time temperature data and the preset temperature range, and controls the output power of the heater according to the comparison result, so as to realize the automatic adjustment of the heating temperature.

[0039] Preferably, the operation panel further includes a display screen and a temperature adjustment switch. The temperature sensor is electrically connected to the display screen. The temperature adjustment switch is electrically connected to the control module. The display screen receives and displays the real-time temperature data transmitted by the temperature sensor. The operator manually adjusts the temperature adjustment knob to send a control instruction to the controller, and the controller controls the output power of the heater, so as to realize the manual adjustment of the heating temperature.

[0040] Preferably, the operation panel further includes a heating switch. The heating switch is electrically connected to the heater, and the heater is turned on or off through the heating switch.

[0041] As a preferred technical solution of the present invention, the operation panel further includes a timing switch. The timing switch is electrically connected to the controller. The controller feedback-controls the vacuum pump. By manually pressing the timing switch to send a timing instruction to the controller, the controller starts counting down according to the preset time after receiving the timing instruction, and controls the vacuum pump to close after the countdown ends.

[0042] Second aspect, the present invention provides a test method for the anti-creep performance of a sealing tape. The test method includes:

[0043] Turn on the vacuum pump and the heating platform. The heating platform starts to heat. During the heating process, continuously evacuate the sealed space through the vacuum pump. After reaching the preset time, turn off the vacuum pump, measure the width of the sealing tape at this time, and calculate the width change rate, which is the creep rate.

[0044] As a preferred technical solution of the present invention, the test method specifically includes the following steps:

[0045] (Ⅰ) Before the test starts, paste the sealing tape to be tested around the four edges of the heating platform, and paste the four edges of the vacuum bag film on the sealing tape so that a sealed space is formed between the vacuum bag film and the heating platform, and then start the test;

[0046] (Ⅱ) Turn on the vacuum pump to pre-evacuate the sealed space. After pre-evacuating for a period of time, measure the width of the sealing tape and record it as M1;

[0047] (Ⅲ) Turn on the heater, and the heating platform gradually heats up. During the heating process, continuously evacuate the sealed space through the vacuum pump. After reaching the preset time, turn off the vacuum pump, measure the average width of the sealing tape and record it as M2, calculate the width change rate of the sealing tape, which is the creep rate, and record it as α. The calculation formula for the creep rate is:

[0048]

[0049] Preferably, the pre-evacuation time in step (Ⅱ) is 5-8 min. For example, it can be 5 min, 6 min, 7 min, 8 min, but is not limited to the listed values. Other unlisted values within this numerical range are also applicable.

[0050] Preferably, in step (Ⅲ), the heating temperature of the heater is adjusted by combining automatic adjustment and manual adjustment.

[0051] Preferably, the automatic adjustment process includes:

[0052] The control module receives the real-time temperature data transmitted by the temperature sensor, makes a logical comparison based on the real-time temperature data and the preset temperature range, and controls the output power of the heater according to the comparison result, so as to realize the automatic adjustment of the automatic heating temperature.

[0053] It should be noted that the automatic adjustment process specifically includes: when the real-time temperature data exceeds the preset temperature upper limit, the control module sends a control instruction to the heater, and after receiving the control instruction, the heater reduces the output power; when the real-time temperature data is lower than the preset temperature lower limit, the control module sends a control instruction to the heater, and after receiving the control instruction, the heater increases the output power;

[0054] Preferably, the manual adjustment process includes:

[0055] The display screen receives and displays the real-time temperature data transmitted by the temperature sensor. The operator manually adjusts the temperature control knob to send a control instruction to the controller, and the controller controls the output power of the heater.

[0056] Preferably, in step (III), the vacuum pumping time of the vacuum pump is automatically controlled, and the automatic control process includes:

[0057] Manually press the timing switch to send a timing instruction to the controller. After receiving the timing instruction, the controller starts counting down according to the preset time. After the countdown ends, the controller controls the vacuum pump to close.

[0058] Compared with the prior art, the beneficial effects of the present invention are:

[0059] In the present invention, the vacuum pump continuously evacuates the vacuum bag closed system, the heating platform performs a heating operation, and when the set temperature is reached, timing starts. The vacuum pump continuously evacuates through the vacuum suction nozzle and the support block covered with the breathable felt. After the test time ends, the width change of the sealing tape at this time is measured. The width change of the tape before and after heating can characterize the magnitude of the deformation of the sealing tape under the action of temperature and internal pressure, that is, the anti-creep ability. At the same time, the presence of the support block provides harsh conditions for the tape during the vacuum pumping process, increasing the pressure of the vacuum bag film on the sealing tape. The test device of the present invention can test the anti-creep ability of the sealing tape in different temperature ranges and different molecular states from room temperature to high temperature and from viscous flow state to crosslinked state, providing a certain basis for the use means of the tape in actual production. Description of the Drawings

[0060] Figure 1 It is a schematic structural diagram of a test device for the anti-creep performance of a sealing tape provided by a specific embodiment of the present invention.

[0061] Wherein, 1 - heating platform; 2 - heating switch; 3 - platform support; 4 - universal wheel; 5 - support block; 6 - breathable felt; 7 - vacuum suction nozzle; 8 - vacuum pump; 9 - temperature control switch; 10 - timing switch; 11 - vacuum tube. Detailed Embodiment

[0062] It should be understood that in the description of the present invention, the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings. These are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more.

[0063] It should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "set", "connected", "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood through specific circumstances.

[0064] Those skilled in the art should understand that the present invention necessarily includes the necessary pipelines, conventional valves, and general pump equipment for realizing the complete process. However, the above contents do not belong to the main inventive points of the present invention. Those skilled in the art can add and arrange them by themselves based on the process flow and equipment structure selection. The present invention does not make special requirements and specific limitations on this.

[0065] The technical solution of the present invention will be further described below with reference to the drawings and through specific embodiments.

[0066] In a specific embodiment, the present invention provides a test device for the anti-creep performance of a sealing tape. The test device is as Figure 1 shown, including a heating platform 1. The length of the heating platform 1 is 800 - 1000 mm, the width of the heating platform 1 is 800 - 1000 mm, the thickness of the heating platform 1 is 2 - 4 mm, the material of the heating platform 1 is No. 36 steel, and a heater and a temperature sensor are arranged inside the heating platform 1. The heater is an electric heater.

[0067] The surface of the heating platform 1 is provided with a support block 5. Specifically, the support block 5 is in a cuboid structure. The length of the support block 5 is 300 - 500 mm, the width of the support block 5 is 300 - 500 mm, the height of the support block 5 is 200 - 300 mm, and the volume of the support block 5 is 50 - 80% of the volume of the sealed space before vacuum pumping. The surface of the support block 5 is coated with at least one layer of breathable felt 6. Further, the surface of the support block 5 is coated with 1 - 3 layers of breathable felt 6. A vacuum suction nozzle 7 is arranged on the breathable felt 6. The vacuum suction nozzle 7 is externally connected to a vacuum pump 8 through a vacuum tube 11. A sealing tape to be tested is pasted along the four peripheral edges of the heating platform 1. A vacuum bag film is covered above the heating platform 1. Specifically, the length of the vacuum bag film is 500 - 800 mm, the width of the vacuum bag film is 500 - 800 mm, and the four peripheral edges of the vacuum bag film are pasted on the sealing tape so as to form a sealed space between the vacuum bag film and the heating platform 1.

[0068] The visible surface area of the heating platform 1 and the support block 5 exposed outside is smaller than the area of the vacuum bag film. There are folds left at the pasting positions of the four peripheral edges of the vacuum bag film and the heating platform 1 for the vacuum bag film to deform. The support block 5 is located in the sealed space at the center of the heating platform 1. The support block 5 and the heating platform 1 are detachably fixed. The sealed space is evacuated by the vacuum pump 8.

[0069] The testing device further includes a moving base. The heating platform 1 is detachably fixed on the moving base. Universal wheels 4 are arranged on the bottom surface of the moving base. An operation panel is arranged on one side surface of the moving base. The operation panel is used to adjust the heating temperature of the heater and the running time of the vacuum pump 8.

[0070] The operation panel includes a control module. The temperature sensor is electrically connected to the control module. The control module feeds back the controlled heater and receives the real-time temperature data transmitted by the temperature sensor, makes a logical comparison according to the real-time temperature data and the preset temperature range, and controls the output power of the heater according to the comparison result, so as to realize the automatic adjustment of the heating temperature.

[0071] The operation panel includes a display screen and a temperature adjustment switch 9. The temperature sensor is electrically connected to the display screen. The temperature adjustment switch 9 is electrically connected to the control module. The display screen receives and displays the real-time temperature data transmitted by the temperature sensor. The operator manually adjusts the temperature adjustment switch 9 to send a control instruction to the controller, and the controller controls the output power of the heater, so as to realize the manual adjustment of the heating temperature.

[0072] The operation panel includes a heating switch 2, which is electrically connected to the heater. The heater is turned on or off by controlling the heating switch 2. The operation panel also includes a timing switch 10, which is electrically connected to the controller. The controller controls the vacuum pump 8 through feedback. A timing command is sent to the controller by manually pressing the timing switch 10. After receiving the timing command, the controller starts counting down according to the preset time. After the countdown ends, the controller controls the vacuum pump 8 to turn off.

[0073] Example 1

[0074] This embodiment provides a test device, a test device provided based on a specific implementation manner, wherein:

[0075] The length of the vacuum bag film is 500 mm, and the width of the vacuum bag film is 500 mm;

[0076] The length of the support block 5 is 300 mm, the width of the support block 5 is 300 mm, the height of the support block 5 is 200 mm, and the volume of the support block 5 is 50% of the volume of the sealed space before vacuum pumping;

[0077] The length of the heating platform 1 is 800 mm, the width of the heating platform 1 is 800 mm, and the thickness of the heating platform 1 is 2 mm.

[0078] Example 2

[0079] This embodiment provides a test device, a test device provided based on a specific implementation manner, wherein:

[0080] The length of the vacuum bag film is 550 mm, and the width of the vacuum bag film is 550 mm;

[0081] The length of the support block 5 is 350 mm, the width of the support block 5 is 350 mm, the height of the support block 5 is 220 mm, and the volume of the support block 5 is 55% of the volume of the sealed space before vacuum pumping;

[0082] The length of the heating platform 1 is 820 mm, the width of the heating platform 1 is 820 mm, and the thickness of the heating platform 1 is 2 mm.

[0083] Example 3

[0084] This embodiment provides a test device, a test device provided based on a specific implementation manner, wherein:

[0085] The length of the vacuum bag film is 650 mm, and the width of the vacuum bag film is 650 mm;

[0086] The length of the support block 5 is 400 mm, the width of the support block 5 is 400 mm, the height of the support block 5 is 250 mm, and the volume of the support block 5 is 65% of the volume of the sealed space before evacuation;

[0087] The length of the heating platform 1 is 900 mm, the width of the heating platform 1 is 900 mm, and the thickness of the heating platform 1 is 3 mm.

[0088] Example 4

[0089] This embodiment provides a testing device. Based on the testing device provided by a specific embodiment, where:

[0090] The length of the vacuum bag film is 700 mm, and the width of the vacuum bag film is 700 mm;

[0091] The length of the support block 5 is 450 mm, the width of the support block 5 is 450 mm, the height of the support block 5 is 270 mm, and the volume of the support block 5 is 70% of the volume of the sealed space before evacuation;

[0092] The length of the heating platform 1 is 940 mm, the width of the heating platform 1 is 940 mm, and the thickness of the heating platform 1 is 3 mm.

[0093] Example 5

[0094] This embodiment provides a testing device. Based on the testing device provided by a specific embodiment, where:

[0095] The length of the vacuum bag film is 800 mm, and the width of the vacuum bag film is 800 mm;

[0096] The length of the support block 5 is 500 mm, the width of the support block 5 is 500 mm, the height of the support block 5 is 300 mm, and the volume of the support block 5 is 80% of the volume of the sealed space before evacuation;

[0097] The length of the heating platform 1 is 1000 mm, the width of the heating platform 1 is 1000 mm, and the thickness of the heating platform 1 is 4 mm.

[0098] Example 6

[0099] This embodiment provides a test method for the anti-creep of a sealing tape. The creep performance of the sealing tape is tested by using the testing device provided in Embodiment 3. The specific steps of the test method are as follows:

[0100] (Ⅰ) Before the test starts, wrap the sealing tape to be tested around the four peripheral edges of the heating platform 1 in a circle, and paste the four peripheral edges of the vacuum bag film on the sealing tape so as to form a sealed space between the vacuum bag film and the heating platform 1, and then start the test;

[0101] (Ⅱ) Turn on the vacuum pump 8 to pre-pump the sealed space. After pre-pumping for 7 minutes, measure the width of the sealing tape to be 11 mm;

[0102] (Ⅲ) Turn on the heater, and the heating platform 1 gradually heats up. Input the preset temperature range of 70 - 120 °C into the control module. The control module receives the real-time temperature data transmitted by the temperature sensor and makes a logical comparison based on the real-time temperature data and the preset temperature range. When the real-time temperature data exceeds 120 °C, the control module sends a control instruction to the heater. After receiving the control instruction, the heater reduces the output power; when the real-time temperature data is lower than 70 °C, the control module sends a control instruction to the heater. After receiving the control instruction, the heater increases the output power;

[0103] During the heating process, continuously evacuate the sealed space through the vacuum pump 8. The evacuation time of the vacuum pump 8 is automatically controlled, that is, manually press the timing switch 10 to send a timing instruction to the controller. After receiving the timing instruction, the controller starts counting down according to the preset time. After the countdown ends, control the vacuum pump 8 to close. Measure the average width of the sealing tape to be 11.8 mm, and calculate the width change rate of the sealing tape = (11.8 - 11) / 11 * 100% = 7.3%, which is the creep rate.

[0104] The applicant declares that the above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention fall within the protection scope and the disclosure scope of the present invention.

Claims

1. A test device for the anti-creep performance of a sealing tape, characterized in that, The described test device includes a heating platform, on the surface of which there are support blocks, and at least one layer of breathable felt is coated on the surface of the support blocks. Vacuum suction nozzles are arranged on the breathable felt, and the vacuum suction nozzles are externally connected to a vacuum pump. Sealing tapes to be tested are pasted along the four peripheral edges of the heating platform. A vacuum bag film is covered above the heating platform, and the four peripheral edges of the vacuum bag film are pasted on the sealing tapes so that a sealed space is formed between the vacuum bag film and the heating platform. The support blocks are located in the sealed space, and the sealed space is evacuated by the vacuum pump. The test device further includes a moving base, and the heating platform is detachably fixed on the moving base.

2. The test device according to claim 1, wherein The visible surface areas of the heating platform and the support blocks exposed outside are smaller than the area of the vacuum bag film.

3. The testing device according to claim 1, characterized in that, At the pasting positions of the four peripheral edges of the vacuum bag film and the heating platform, there are folds for the vacuum bag film to deform.

4. The testing device according to claim 1, wherein The length of the vacuum bag film is 500 - 800 mm.

5. The testing device according to claim 1, characterized in that, The width of the vacuum bag film is 500 - 800 mm.

6. The test device according to claim 1, characterized in that Universal wheels are arranged on the bottom surface of the moving base.

7. The test device according to claim 1, wherein The vacuum suction nozzles are externally connected to the vacuum pump through vacuum tubes.

8. The test device according to claim 1, characterized in that, The support blocks are located at the center of the heating platform.

9. The test device according to claim 1, wherein, The support blocks and the heating platform are detachably fixed.

10. The testing device according to claim 1, characterized in that 1 - 3 layers of breathable felt are coated on the surface of the support blocks.

11. The test device according to claim 1, characterized in that, The support blocks are of cuboid structure.

12. The testing device according to claim 1, characterized in that, The length of the support blocks is 300 - 500 mm.

13. The testing device according to claim 1, characterized in that The width of the support blocks is 300 - 500 mm.

14. The test device according to claim 1, characterized in that, The height of the support blocks is 200 - 300 mm.

15. The test device according to claim 1, characterized in that, The volume of the support blocks is 50 - 80% of the volume of the sealed space before evacuation.

16. The test device according to claim 1, characterized in that, The length of the heating platform is 800 - 1000 mm.

17. The testing device according to claim 1, characterized in that, The width of the heating platform is 800 - 1000 mm.

18. The test device according to claim 1, characterized in that The thickness of the heating platform is 2 - 4 mm.

19. The testing device according to claim 1, wherein The material of the heating platform is No. 36 steel.

20. The test device according to claim 1, wherein, A heater and a temperature sensor are arranged inside the heating platform.

21. The test device according to claim 20, characterized in that, The heater is an electric heater.

22. The test device according to claim 7, characterized in that, An operation panel is arranged on one side of the moving base, and the operation panel is used to adjust the heating temperature of the heater and the running time of the vacuum pump.

23. The test device according to claim 22, wherein, The operation panel includes a control module. The temperature sensor is electrically connected to the control module. The control module feedback - controls the heater. The control module receives the real - time temperature data transmitted by the temperature sensor, makes a logical comparison according to the real - time temperature data and the preset temperature range, and controls the output power of the heater according to the comparison result, so as to realize the automatic adjustment of the heating temperature.

24. The test device according to claim 22, characterized in that, The operation panel further includes a display screen and a temperature - regulating switch. The temperature sensor is electrically connected to the display screen. The temperature - regulating switch is electrically connected to the control module. The display screen receives and displays the real - time temperature data transmitted by the temperature sensor. The operator manually adjusts the temperature - regulating switch to send a control instruction to the controller, and the controller controls the output power of the heater, so as to realize the manual adjustment of the heating temperature.

25. The test device according to claim 22, characterized in that, The operation panel further includes a heating switch, and the heating switch is electrically connected to the heater. The heater is turned on or off through the heating switch.

26. The testing device according to claim 22, characterized in that, The operation panel further includes a timing switch, which is electrically connected to the controller. The controller feedback-controls the vacuum pump. By manually pressing the timing switch, a timing instruction is sent to the controller. After receiving the timing instruction, the controller starts counting down according to a preset time, and controls the vacuum pump to turn off after the countdown ends.

27. A test method for the anti-creep performance of a sealing tape, characterized in that, Use the testing device described in any one of claims 1-26 to test the anti-creep performance of the sealing tape; the testing method includes: Turn on the vacuum pump and the heating platform. The heating platform starts heating. During the heating process, the vacuum pump continuously evacuates the sealed space. After reaching the preset time, turn off the vacuum pump, measure the width of the sealing tape at this time, and calculate the width change rate, which is the creep rate.

28. The test method according to claim 27, characterized in that, The specific testing method includes the following steps: (Ⅰ) Before the test starts, paste the sealing tape to be tested around the four edges of the heating platform. Paste the four edges of the vacuum bag film on the sealing tape so that a sealed space is formed between the vacuum bag film and the heating platform, and then start the test; (Ⅱ) Turn on the vacuum pump to pre-evacuate the sealed space. After pre-evacuating for a period of time, measure the width of the sealing tape and record it as M1; (Ⅲ) Turn on the heater, and the heating platform gradually heats up. During the heating process, the vacuum pump continuously evacuates the sealed space. After reaching the preset time, turn off the vacuum pump, measure the average width of the sealing tape and record it as M2, calculate the width change rate of the sealing tape, which is the creep rate, and record it as α. The calculation formula for the creep rate is: 。 29. The test method according to claim 28, wherein The pre-evacuation time in step (Ⅱ) is 5-8 minutes.

30. The test method according to claim 28, wherein In step (Ⅲ), the heating temperature of the heater is adjusted by combining automatic adjustment and manual adjustment.

31. The test method according to claim 30, wherein The automatic adjustment process includes: The control module receives the real-time temperature data transmitted by the temperature sensor, makes a logical comparison based on the real-time temperature data and the preset temperature range, and controls the output power of the heater according to the comparison result, so as to realize the automatic adjustment of the automatic heating temperature.

32. The test method according to claim 30, characterized in that, The manual adjustment process includes: The display screen receives and displays the real-time temperature data transmitted by the temperature sensor. The operator manually adjusts the temperature control switch to send a control instruction to the controller, and the controller controls the output power of the heater.

33. The test method according to claim 27, characterized in that, In the step, the evacuation time of the vacuum pump is automatically controlled. The automatic control process includes: Manually press the timing switch to send a timing instruction to the controller. After receiving the timing instruction, the controller starts counting down according to a preset time, and controls the vacuum pump to turn off after the countdown ends.

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