A process for detecting the properties of plastic particles in an injection molding machine

Abstract

The application belongs to the technical field of plastics, and particularly relates to a plastic particle performance detection process in an injection molding machine, which aims at the problem that existing detection data can only be obtained and material conditions in the detection process cannot be understood, and the following scheme is proposed, which comprises the following steps: S1: obtaining plastic particles, and then obtaining a marker material, the amount of the marker material being 0.2% to 1% of the amount of the plastic particles, and the marker material comprising fluorescent powder, indolizine, powdered rubber, ethylene glycol and paraffin wax; S2: pouring the plastic particles and the marker material into a stirring device for stirring, and performing fluorescent marking on the material of the plastic particles by the marker material, so that a fluorescent picture of the plastic particles is obtained in the performance detection process, the change of the plastic particles before and after the detection and in the detection process is understood by using the fluorescent picture, and the change of the material attached with the fluorescent is understood, and if the fluorescent gathers together or the fluorescent is unevenly distributed, it is indicated that the plastic particles are not uniformly stirred in the production process.

Description

Technical Field

[0001] This invention relates to the field of plastics technology, and in particular to a process for testing the properties of plastic particles in an injection molding machine. Background Technology

[0002] Patent application number 202010096374.3 discloses a process for testing the performance of plastic particles in an injection molding machine. The main formulation of the plastic particles is 25-33 parts of low-density polyethylene, 5-8 parts of silane cross-linked polyethylene, 15-18 parts of chloroprene rubber, 5-8 parts of polyphthalamide, 4-6 parts of poly(p-hydroxybenzoate), 2-5 parts of α-cyanoacrylate, 4-6 parts of dibutyltin dilaurate, 3-5 parts of tributyl borate, and 1-4 parts of dioctyl phthalate. In this invention, different testing methods are used to analyze the performance of plastic particles under different environments, thereby enabling more accurate performance analysis. This allows for better data recording of the performance of plastic particles in different environments, enabling the production and use of plastic particles with different properties.

[0003] However, the plastic particle performance testing process in this injection molding machine also has some problems. For example, it can only obtain simple surface data during the performance testing process, and it is difficult to understand the distribution changes of internal materials and the uniformity of mixing between materials, so it is difficult to find problems in the plastic particle production process. Summary of the Invention

[0004] Given the limitations of existing technologies that only provide detection data and fail to provide insights into the material properties during the detection process, this invention proposes a process for detecting the properties of plastic particles in injection molding machines.

[0005] This invention proposes a process for testing the properties of plastic particles in an injection molding machine, comprising the following steps:

[0006] S1: Obtain plastic particles, and then obtain a labeling material. The amount of the labeling material is 0.2% to 1% of the amount of plastic particles. The labeling material includes fluorescent powder, m-diazide indene, powdered rubber, ethylene glycol and paraffin.

[0007] S2: Pour the plastic particles and marking materials into a mixing device and mix them until they are evenly mixed to obtain a mixture. The mixture is then extruded using a twin-screw extruder.

[0008] S3: After twin-screw extrusion, the plastic particles to be tested are granulated using a granulator.

[0009] S4: The prepared product is subjected to flow performance test and compressive strength test, and its fluorescence image is obtained during the test.

[0010] Preferably, in step S1, the plastic particles are selected from one of PVC, PE, PP, PU and PET, or plastics containing silicone rubber, or plastics containing fluorine, to facilitate the testing of various materials.

[0011] Preferably, in step S1, the ratio of fluorescent powder, m-diazepine indene, powdered rubber, ethylene glycol, and paraffin in the marking material is controlled at 5:1:2:3:1 to ensure the marking effect of the material.

[0012] Preferably, in step S1, the fluorescent powder is selected as environmentally friendly rare earth material aluminate long-lasting phosphorescent powder, the powdered rubber is one of natural rubber powder and powdered nitrile rubber, and the paraffin is fully refined paraffin to ensure material compatibility.

[0013] Preferably, in step S1, the fluorescent powder, m-diazepine indene, and powdered rubber are all pre-ground in a grinding equipment, passed through a 200-mesh sieve, and set aside for later use. The pulverized material is convenient for subsequent processing.

[0014] Preferably, in step S1, the preparation method of the marking material is as follows: fluorescent powder, indene, powdered rubber, ethylene glycol, and paraffin are obtained according to a certain ratio. Then, the fluorescent powder, indene, and powdered rubber are added to a stirring device and stirred evenly. Ethylene glycol is then obtained and heated to 55°C–75°C. Paraffin is then added and stirred. After stirring evenly, the evenly mixed fluorescent powder, indene, and powdered rubber are added, and stirring continues. After stirring evenly, the mixture is heated to 350°C–450°C and heated continuously for 15 minutes to obtain the marking material, ensuring the marking effect of the marking material.

[0015] Preferably, in step S1, the marking material is poured into a grinding device for grinding until it passes through a 100-mesh sieve and is set aside. The plastic particles are then poured into a crusher for crushing to produce powder, which is set aside to facilitate material compatibility.

[0016] Preferably, in step S4, the plastic particles to be tested are injection molded into test strips, and the molten plastic particles are injection molded into standard test strips. The standard test strips are then subjected to physical property tests, including tensile, impact, Vicat softening point, and surface hardness tests, to obtain the tensile, impact, Vicat softening point, and surface hardness performance parameters of the plastic particles, thus obtaining more data.

[0017] Preferably, in step S4, the flow performance test involves obtaining plastic particles, heating and melting them, using a plastic melt indexer to determine their flow performance during processing, and taking a fluorescence image of them. This process can test the flow performance of the plastic particles.

[0018] Preferably, in step S4, plastic particles are obtained, placed in a hydraulic testing device, and pressed down to detect the pressure during deformation. Subsequently, the plastic particles are pressed into a disc shape, and their fluorescent images are obtained, which can test the condition of the plastic particles after deformation.

[0019] The beneficial effects of this invention are:

[0020] Fluorescent labeling of plastic particles is performed using a labeling material. Fluorescent images are then obtained during performance testing. These images are used to understand the changes in the plastic particles before, during, and after testing, as well as the changes in the material to which the fluorescence adheres. If the fluorescence aggregates or is unevenly distributed, it indicates that the plastic particles were not thoroughly stirred during production. Attached Figure Description

[0021] Figure 1 This is a flowchart illustrating the workflow proposed in this invention. Implementation

[0022] The present invention will be further explained below with reference to specific embodiments.

[0023] Reference Figure 1 Example 1

[0024] This embodiment proposes a process for testing the properties of plastic particles in an injection molding machine, including the following steps:

[0025] S1: Obtain plastic particles, then obtain the marking material. The marking material accounts for 0.8% of the plastic particle weight. The marking material includes fluorescent powder, m-diazide indene, powdered rubber, ethylene glycol, and paraffin wax. PVC is selected as the plastic particles. The ratio of fluorescent powder, m-diazide indene, powdered rubber, ethylene glycol, and paraffin wax in the marking material is controlled at 5:1:2:3:1. The fluorescent powder is an environmentally friendly rare earth material, aluminate long-lasting phosphorescent powder. The powdered rubber is either natural rubber powder or powdered nitrile rubber. The paraffin wax is fully refined paraffin wax. The fluorescent powder, m-diazide indene, and powdered rubber are all pre-ground in a grinding equipment and passed through a 200-mesh sieve. They are then set aside for later use. Preparation method of the marking material: Obtain fluorescent powder, m-diazide indene, powdered rubber, ethylene glycol and paraffin according to the proportion. Then, add the fluorescent powder, m-diazide indene and powdered rubber into the inside of the stirring equipment and stir evenly. Then, obtain ethylene glycol, heat it to 65°C, add paraffin and stir. After stirring evenly, add the evenly mixed fluorescent powder, m-diazide indene and powdered rubber, and continue stirring. After stirring evenly, heat to 380°C and continue heating for 15 minutes to obtain the marking material. Pour the marking material into the grinding equipment for grinding until it passes through a 100-mesh sieve and set aside. Pour the plastic particles into the crusher for crushing to obtain powder and set aside.

[0026] S2: Pour the plastic particles and marking materials into a mixing device and mix them until they are evenly mixed to obtain a mixture. The mixture is then extruded using a twin-screw extruder.

[0027] S3: After twin-screw extrusion, the plastic particles to be tested are granulated using a granulator.

[0028] S4: The prepared product is subjected to flow performance and compressive strength tests. The plastic particles to be tested are injection molded into test strips. The molten plastic particles are injection molded into standard test strips. The standard test strips are subjected to physical performance tests, including tensile, impact, Vicat softening point and surface hardness tests. The tensile, impact, Vicat softening point and surface hardness performance parameters of the plastic particles are obtained. Fluorescent images are obtained during the test. Flow performance test: Plastic particles are obtained, heated and melted. The flow performance during the processing is determined using a plastic melt indexer, and its fluorescent image is taken. Plastic particles are obtained and placed in a hydraulic testing device for pressing. The pressure during deformation is detected. Then the plastic particles are pressed into a disc shape, and its fluorescent image is obtained.

[0029] Reference Figure 1 Example 2

[0030] This embodiment proposes a process for testing the properties of plastic particles in an injection molding machine, including the following steps:

[0031] S1: Obtain plastic particles, then obtain the marking material. The marking material accounts for 0.6% of the plastic particle weight. The marking material includes fluorescent powder, m-diazide indene, powdered rubber, ethylene glycol, and paraffin wax. PVC is selected as the plastic particles. The ratio of fluorescent powder, m-diazide indene, powdered rubber, ethylene glycol, and paraffin wax in the marking material is controlled at 5:1:2:3:1. The fluorescent powder is an environmentally friendly rare earth material, aluminate long-lasting phosphorescent powder. The powdered rubber is either natural rubber powder or powdered nitrile rubber. The paraffin wax is fully refined paraffin wax. The fluorescent powder, m-diazide indene, and powdered rubber are all pre-ground in a grinding equipment and passed through a 200-mesh sieve. They are then set aside for later use. Preparation method of the marking material: Obtain fluorescent powder, m-diazide indene, powdered rubber, ethylene glycol and paraffin according to the proportion. Then, add the fluorescent powder, m-diazide indene and powdered rubber into the inside of the stirring equipment and stir evenly. Then, obtain ethylene glycol, heat it to 65°C, add paraffin and stir. After stirring evenly, add the evenly mixed fluorescent powder, m-diazide indene and powdered rubber, and continue stirring. After stirring evenly, heat to 380°C and continue heating for 15 minutes to obtain the marking material. Pour the marking material into the grinding equipment for grinding until it passes through a 100-mesh sieve and set aside. Pour the plastic particles into the crusher for crushing to obtain powder and set aside.

[0032] S2: Pour the plastic particles and marking materials into a mixing device and mix them until they are evenly mixed to obtain a mixture. The mixture is then extruded using a twin-screw extruder.

[0033] S3: After twin-screw extrusion, the plastic particles to be tested are granulated using a granulator.

[0034] S4: The prepared product is subjected to flow performance and compressive strength tests. The plastic particles to be tested are injection molded into test strips. The molten plastic particles are injection molded into standard test strips. The standard test strips are subjected to physical performance tests, including tensile, impact, Vicat softening point and surface hardness tests. The tensile, impact, Vicat softening point and surface hardness performance parameters of the plastic particles are obtained. Fluorescent images are obtained during the test. Flow performance test: Plastic particles are obtained, heated and melted. The flow performance during the processing is determined using a plastic melt indexer, and its fluorescent image is taken. Plastic particles are obtained and placed in a hydraulic testing device for pressing. The pressure during deformation is detected. Then the plastic particles are pressed into a disc shape, and its fluorescent image is obtained.

[0035] Reference Figure 1 Example 3

[0036] This embodiment proposes a process for testing the properties of plastic particles in an injection molding machine, including the following steps:

[0037] S1: Obtain plastic particles, then obtain the marking material. The marking material accounts for 0.3% of the plastic particle weight. The marking material includes fluorescent powder, m-diazide indene, powdered rubber, ethylene glycol, and paraffin wax. PVC is selected as the plastic particles. The ratio of fluorescent powder, m-diazide indene, powdered rubber, ethylene glycol, and paraffin wax in the marking material is controlled at 5:1:2:3:1. The fluorescent powder is an environmentally friendly rare earth material, aluminate long-lasting phosphorescent powder. The powdered rubber is either natural rubber powder or powdered nitrile rubber. The paraffin wax is fully refined paraffin wax. The fluorescent powder, m-diazide indene, and powdered rubber are all pre-ground in a grinding equipment and passed through a 200-mesh sieve. They are then set aside for later use. Preparation method of the marking material: Obtain fluorescent powder, m-diazide indene, powdered rubber, ethylene glycol and paraffin according to the proportion. Then, add the fluorescent powder, m-diazide indene and powdered rubber into the inside of the stirring equipment and stir evenly. Then, obtain ethylene glycol, heat it to 65°C, add paraffin and stir. After stirring evenly, add the evenly mixed fluorescent powder, m-diazide indene and powdered rubber, and continue stirring. After stirring evenly, heat to 380°C and continue heating for 15 minutes to obtain the marking material. Pour the marking material into the grinding equipment for grinding until it passes through a 100-mesh sieve and set aside. Pour the plastic particles into the crusher for crushing to obtain powder and set aside.

[0038] S2: Pour the plastic particles and marking materials into a mixing device and mix them until they are evenly mixed to obtain a mixture. The mixture is then extruded using a twin-screw extruder.

[0039] S3: After twin-screw extrusion, the plastic particles to be tested are granulated using a granulator.

[0040] S4: The prepared product is subjected to flow performance and compressive strength tests. The plastic particles to be tested are injection molded into test strips. The molten plastic particles are injection molded into standard test strips. The standard test strips are subjected to physical performance tests, including tensile, impact, Vicat softening point and surface hardness tests. The tensile, impact, Vicat softening point and surface hardness performance parameters of the plastic particles are obtained. Fluorescent images are obtained during the test. Flow performance test: Plastic particles are obtained, heated and melted. The flow performance during the processing is determined using a plastic melt indexer, and its fluorescent image is taken. Plastic particles are obtained and placed in a hydraulic testing device for pressing. The pressure during deformation is detected. Then the plastic particles are pressed into a disc shape, and its fluorescent image is obtained.

[0041] Reference Figure 1 Example 4

[0042] This embodiment proposes a process for testing the properties of plastic particles in an injection molding machine, including the following steps:

[0043] S1: Obtain plastic particles, then obtain the marking material. The marking material accounts for 0.2% of the plastic particle weight. The marking material includes fluorescent powder, m-diazide indene, powdered rubber, ethylene glycol, and paraffin wax. PVC is selected as the plastic particles. The ratio of fluorescent powder, m-diazide indene, powdered rubber, ethylene glycol, and paraffin wax in the marking material is controlled at 5:1:2:3:1. The fluorescent powder is an environmentally friendly rare earth material, aluminate long-lasting phosphorescent powder. The powdered rubber is either natural rubber powder or powdered nitrile rubber. The paraffin wax is fully refined paraffin wax. The fluorescent powder, m-diazide indene, and powdered rubber are all pre-ground in a grinding equipment and passed through a 200-mesh sieve. They are then set aside for later use. Preparation method of the marking material: Obtain fluorescent powder, m-diazide indene, powdered rubber, ethylene glycol and paraffin according to the proportion. Then, add the fluorescent powder, m-diazide indene and powdered rubber into the inside of the stirring equipment and stir evenly. Then, obtain ethylene glycol, heat it to 65°C, add paraffin and stir. After stirring evenly, add the evenly mixed fluorescent powder, m-diazide indene and powdered rubber, and continue stirring. After stirring evenly, heat to 380°C and continue heating for 15 minutes to obtain the marking material. Pour the marking material into the grinding equipment for grinding until it passes through a 100-mesh sieve and set aside. Pour the plastic particles into the crusher for crushing to obtain powder and set aside.

[0044] S2: Pour the plastic particles and marking materials into a mixing device and mix them until they are evenly mixed to obtain a mixture. The mixture is then extruded using a twin-screw extruder.

[0045] S3: After twin-screw extrusion, the plastic particles to be tested are granulated using a granulator.

[0046] S4: The prepared product is subjected to flow performance and compressive strength tests. The plastic particles to be tested are injection molded into test strips. The molten plastic particles are injection molded into standard test strips. The standard test strips are subjected to physical performance tests, including tensile, impact, Vicat softening point and surface hardness tests. The tensile, impact, Vicat softening point and surface hardness performance parameters of the plastic particles are obtained. Fluorescent images are obtained during the test. Flow performance test: Plastic particles are obtained, heated and melted. The flow performance during the processing is determined using a plastic melt indexer, and its fluorescent image is taken. Plastic particles are obtained and placed in a hydraulic testing device for pressing. The pressure during deformation is detected. Then the plastic particles are pressed into a disc shape, and its fluorescent image is obtained.

[0047] Reference Figure 1 Example 5

[0048] This embodiment proposes a process for testing the properties of plastic particles in an injection molding machine, including the following steps:

[0049] S1: Obtain plastic particles, then obtain the marking material, which accounts for 1% of the plastic particle weight. The marking material includes fluorescent powder, m-diazide indene, powdered rubber, ethylene glycol, and paraffin wax. PVC is selected as the plastic particles. The ratio of fluorescent powder, m-diazide indene, powdered rubber, ethylene glycol, and paraffin wax in the marking material is controlled at 5:1:2:3:1. The fluorescent powder is an environmentally friendly rare earth material, aluminate long-lasting phosphorescent powder. The powdered rubber is either natural rubber powder or powdered nitrile rubber. The paraffin wax is fully refined paraffin wax. The fluorescent powder, m-diazide indene, and powdered rubber are all pre-ground in a grinding device, passing through a 200-mesh sieve, and then set aside for later use. Preparation method of the marking material: Obtain fluorescent powder, m-diazide indene, powdered rubber, ethylene glycol and paraffin according to the proportion. Then, add the fluorescent powder, m-diazide indene and powdered rubber into the inside of the stirring equipment and stir evenly. Then, obtain ethylene glycol, heat it to 65°C, add paraffin and stir. After stirring evenly, add the evenly mixed fluorescent powder, m-diazide indene and powdered rubber, and continue stirring. After stirring evenly, heat to 380°C and continue heating for 15 minutes to obtain the marking material. Pour the marking material into the grinding equipment for grinding until it passes through a 100-mesh sieve and set aside. Pour the plastic particles into the crusher for crushing to obtain powder and set aside.

[0050] S2: Pour the plastic particles and marking materials into a mixing device and mix them until they are evenly mixed to obtain a mixture. The mixture is then extruded using a twin-screw extruder.

[0051] S3: After twin-screw extrusion, the plastic particles to be tested are granulated using a granulator.

[0052] S4: The prepared product is subjected to flow performance and compressive strength tests. The plastic particles to be tested are injection molded into test strips. The molten plastic particles are injection molded into standard test strips. The standard test strips are subjected to physical performance tests, including tensile, impact, Vicat softening point and surface hardness tests. The tensile, impact, Vicat softening point and surface hardness performance parameters of the plastic particles are obtained. Fluorescent images are obtained during the test. Flow performance test: Plastic particles are obtained, heated and melted. The flow performance during the processing is determined using a plastic melt indexer, and its fluorescent image is taken. Plastic particles are obtained and placed in a hydraulic testing device for pressing. The pressure during deformation is detected. Then the plastic particles are pressed into a disc shape, and its fluorescent image is obtained.

[0053] The performance testing processes of Examples 1 to 5 are compared with the conventional performance testing process. The performance testing processes of Examples 1 to 5 are shown in the table below:

[0054] Comparative Example Example 1 Example 2 Example 3 Example 4 Example 5 Is it possible to understand the internal material composition of the plastic particles? no yes yes yes yes yes Accuracy of detection 92% 99% 99% 99% 98% 98%

[0055] As can be seen from the table above, the performance testing process of the present invention utilizes marking materials to detect the internal material properties of plastic particles.

[0056] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A process for testing the properties of plastic particles in an injection molding machine, characterized in that, Includes the following steps: S1: Obtain plastic particles, then obtain the marking material. The marking material accounts for 0.2% to 1% of the plastic particle weight. The marking material includes fluorescent powder, m-diazide indene, powdered rubber, ethylene glycol, and paraffin wax. The plastic particles are selected from PVC, PE, PP, PU, ​​and PET, or plastics containing silicone rubber, or fluorinated plastics. The ratio of fluorescent powder, m-diazide indene, powdered rubber, ethylene glycol, and paraffin wax in the marking material is controlled at 5:1:2:3:

1. The fluorescent powder is selected as environmentally friendly rare earth aluminate long-lasting phosphorescent powder, the powdered rubber is one of natural rubber powder and powdered nitrile rubber, and the paraffin wax is fully refined paraffin wax. The fluorescent powder, m-diazide indene, and powdered rubber are all pre-ground in a grinding device. Grind it through a 200-mesh sieve and set aside for later use; Preparation method of the marking material: Obtain fluorescent powder, m-diazide indene, powdered rubber, ethylene glycol and paraffin wax according to the proportion. Then add the fluorescent powder, m-diazide indene and powdered rubber into the inside of the stirring equipment and stir evenly. Then obtain ethylene glycol and heat it to 55℃~75℃. Then add paraffin wax and stir. After stirring evenly, add the evenly mixed fluorescent powder, m-diazide indene and powdered rubber and continue stirring. After stirring evenly, heat to 350℃~450℃ and continue heating for 15 minutes to obtain the marking material; Pour the marking material into the grinding equipment for grinding until it passes through a 100-mesh sieve and set aside for later use. Pour the plastic particles into the crusher for crushing to obtain powder and set aside for later use; S2: Pour the plastic particles and marking materials into a mixing device and mix them until they are evenly mixed to obtain a mixture. The mixture is then extruded using a twin-screw extruder. S3: After twin-screw extrusion, the plastic particles to be tested are granulated using a granulator. S4: The prepared product is subjected to flow performance test and compressive strength test, and its fluorescence image is obtained during the test.

2. The process for testing the properties of plastic particles in an injection molding machine according to claim 1, characterized in that, In S4, the plastic particles to be tested are injection molded into test strips, and the molten plastic particles are taken and injection molded into standard test strips. The physical properties of the standard test strips are tested, including tensile, impact, Vicat softening point and surface hardness tests, to obtain the tensile, impact, Vicat softening point and surface hardness performance parameters of the plastic particles.

3. The process for testing the properties of plastic particles in an injection molding machine according to claim 1, characterized in that, In S4, flow performance testing: plastic particles are obtained, heated and melted, and their flow performance during processing is determined using a plastic melt indexer, and their fluorescence images are taken.

4. The process for testing the properties of plastic particles in an injection molding machine according to claim 1, characterized in that, In S4, plastic particles are obtained, placed in a hydraulic testing device, and pressed down to detect the pressure during deformation. The plastic particles are then pressed into a disc shape, and their fluorescent images are obtained.

Images