A multi-layer injection in-mold labeling injection molding method and injection molding mold

Abstract

The application relates to a multilayer injection in-mold labeling injection molding method and an injection molding mold, and relates to the technical field of injection molding, which comprises the following steps: collecting actual injection molding data and obtaining product information and mold information in response to an injection signal; determining standard injection molding data according to the product information and the mold information; reading a standard injection molding curve from the standard injection molding data and reading actual injection molding pressure from the actual injection molding data; determining cold material content by combining the standard injection molding curve and the actual injection molding pressure; determining abnormal data according to the cold material content and the standard injection molding curve; determining a repair type through the abnormal data; obtaining an abnormal position and an abnormal difference value according to the abnormal data based on the repairable type; matching an electromagnetic number according to the abnormal position and matching a magnetic force parameter corresponding to the electromagnetic number according to the abnormal difference value; and integrating and executing a repair instruction by combining the electromagnetic number and the corresponding magnetic force parameter. The application has the effects of reducing diaphragm wrinkle conditions and guaranteeing product molding quality.

Description

Technical Field

[0001] This invention relates to the field of injection molding technology, and in particular to a method for in-mold labeling of multi-layer injection molding and an injection molding die. Background Technology

[0002] The light-emitting element of a vehicle headlight is a key component in the automotive interior and exterior systems that enables ambient lighting and signal indication functions. It is typically manufactured using injection molding.

[0003] Currently, a mainstream type of automotive light-emitting component is a multi-layer composite structure, which includes a light-guiding transparent component, a body-colored strip component, and a functional film sandwiched between the transparent component and the strip component. When in use, light can pass through the transparent component. When not lit, the film and the strip component achieve seamless integration with the body color. The current production method is to place the functional film directly in the fixed mold cavity before injection molding the transparent component, then close the mold and injection mold the transparent component. After the transparent component cools and solidifies, the semi-finished product is transferred to the next station to injection mold the strip component.

[0004] However, when injection molding transparent parts, the molten plastic impacts the pre-placed diaphragm, which can easily cause the diaphragm to wrinkle or lift up, affecting the product molding quality. Summary of the Invention

[0005] To reduce film warping or wrinkling and ensure product molding quality, this invention provides a multi-layer injection mold in-mold labeling molding method and injection molding mold.

[0006] In a first aspect, the present invention provides a multi-layer injection mold in-mold labeling molding method, which adopts the following technical solution: A multi-layer injection molding method for in-mold labeling includes: S10: Responds to the injection signal, collects actual injection data, and obtains product and mold information; S11: Determine standard injection molding data based on product information and mold information; S12: Read the standard injection curve from the standard injection data and the actual injection pressure from the actual injection data; S13: Determine the cold stock content by combining the standard injection molding curve and the actual injection pressure; S14: Determine abnormal data based on cold material content and standard injection molding curve; S15: Determine the repair type based on abnormal data; the repair type includes repairable types. S16: Based on the repairable type, obtain the anomaly location and anomaly difference from the abnormal data; S17: Match the electromagnetic number according to the abnormal location, and match the magnetic parameters corresponding to the electromagnetic number according to the abnormal difference; S18: The repair command is obtained and executed by combining the electromagnetic number and its corresponding magnetic parameters.

[0007] By adopting the above technical solution, actual injection data is collected during the injection molding process and compared with standard injection data to determine the real-time status of the functional diaphragm in the cavity. Then, when the functional diaphragm undergoes minor abnormal deformation, the electromagnetic force of the electromagnet used to adsorb the functional diaphragm is adjusted to complete the repair of the abnormal situation, effectively reducing problems such as functional diaphragm warping and wrinkling during the injection molding process.

[0008] Optional methods for identifying outlier data include: S20: Determine the filling section curve and injection section curve based on the standard injection molding curve; S21: The correction time and correction pressure are obtained by combining the cold material content and the filling section curve; S22: Read the injection time from the actual injection data, and calculate the filling pressure difference by subtracting the correction pressure from the actual injection pressure based on the same correction time and injection time; S23: When the filling pressure difference is not less than the preset filling pressure threshold, the filling pressure difference and its corresponding injection time and actual injection pressure are defined as abnormal data.

[0009] By adopting the above technical solution, the standard injection molding curve is divided into a filling segment curve and an injection segment curve. The deviation caused by the cold material in the filling segment curve is identified, and the standard data of the injection segment curve is corrected in combination with the deviation, thereby improving the accuracy of subsequent determination of abnormal data.

[0010] Optional methods for determining the cold feed content include: S30: Determine the corresponding standard average pressure based on the injection section curve; S31: Determine the injection fluctuation value based on the actual injection pressure; S32: When the injection fluctuation value is not less than the preset fluctuation threshold, the injection duration at this time shall be taken as the fluctuation duration; S33: Determine the actual average pressure by combining the fluctuation duration and the corresponding actual injection pressure; S34: The pressure difference is calculated based on the standard average pressure and the actual average pressure; S35: Determine the cold material content based on the pressure difference.

[0011] By adopting the above technical solution, the timing of cold material occurrence is determined by the pressure fluctuation during the injection molding process. The actual average pressure in the entire data is combined with the standard average pressure to obtain the pressure difference. The corresponding cold material content is directly matched based on the pressure difference. The cold material content can be determined by relying on the pressure data.

[0012] Optional methods for determining abnormal locations include: S40: Determine the instantaneous flow rate based on the corrected pressure; S41: Determine the filler content by combining the actual injection pressure, instantaneous flow rate, and injection duration in abnormal data; S42: Determine the arrival location based on mold information and filler content; S43: Acquire the resonant frequency based on the arrival position; S44: Obtain the standard frequency threshold through mold information; S45: Define the arrival position corresponding to the resonant frequency that is greater than the standard frequency threshold as an abnormal position.

[0013] By adopting the above technical solution, the location of the molten plastic when an abnormal situation occurs can be calculated by combining the filling content with the mold information. Then, the location can be further determined by combining the resonant frequency collected by the pre-embedded electromagnet, thereby quickly locating the specific abnormal location.

[0014] Optional methods for determining the repair type include: S50: When the filling pressure difference is less than the preset repair pressure threshold, it is determined to be a repairable type; S510: When the filling pressure difference is not less than the repair pressure threshold, obtain the collection coverage area; S511: Determine the abnormal coverage area based on the collected coverage area and the abnormal location; S512: The frequency offset is calculated by combining the resonant frequency and the standard frequency threshold; S513: Select the largest frequency offset as the center offset; S514: If the center offset is greater than the preset offset threshold and the abnormal coverage area is greater than the preset area threshold, it is determined to be an unrepairable type; otherwise, it is determined to be a repairable type.

[0015] By adopting the above technical solution, the initial repairability is determined by the filling pressure difference, and cases with slight deformation are directly screened. Then, the degree of deformation is further determined based on the center deviation, and the area affected by deformation is determined based on the collection coverage area. Combined, a secondary repair determination is made for abnormal cases.

[0016] Optionally, the methods for determining the repair instructions include: S60: Determine the reference current value based on the abnormal difference value corresponding to the abnormal location; S61: Determine the deformation type by frequency offset. Deformation types include warping deformation and wrinkling deformation. S62: Based on the warping deformation, the repair command is obtained by integrating the electromagnetic number and reference current value corresponding to the abnormal location; S63: Based on the fold deformation, a local coordinate system is established with the abnormal position corresponding to the center offset as the origin; S64: Determine the discrete distribution values ​​corresponding to the anomaly locations based on the local coordinate system; S65: Determine the fold extension direction and influence coefficient by distributing discrete values; S66: Determine the execution current value based on the fold extension direction, influence coefficient, and reference current value; S67: A repair instruction is obtained by combining the electromagnetic number corresponding to the abnormal location and the execution current value.

[0017] By adopting the above technical solution, the severity of deformation at abnormal locations is matched with the basic current, and targeted repairs are made based on different deformation types. For warped deformation, the corresponding electromagnets at all abnormal locations are adjusted to directly attract and adhere the warped parts. For wrinkled deformation, the adjustment is made according to the direction of wrinkle extension to achieve the effect of dragging the wrinkled parts to both sides.

[0018] Optional methods for determining the deformation type include: S70: Determine the cavity area by combining abnormal location and mold information; S71: Based on cavity region matching interference coefficient; S72: Determine the frequency fluctuation coefficient and frequency averaging coefficient based on the frequency offset and interference coefficient; S73: Filter frequency offsets that are not less than the average frequency coefficient and obtain the corresponding number of out-of-range values; S74: Get the total number of abnormal locations; S75: If the number of exceeding the standard is not less than half of the total number and the frequency fluctuation coefficient is less than the preset fluctuation coefficient threshold, it is determined to be a warping deformation. S76: If the number of exceeding the standard is less than half of the total number and the frequency fluctuation coefficient is not less than the fluctuation coefficient threshold, it is determined to be a wrinkled deformation.

[0019] By adopting the above technical solution, the interference coefficients are matched according to different structural regions inside the cavity, thereby compensating for different cavity structure judgment criteria. Then, the deformation type is judged by combining the number of exceedances and the degree of deformation fluctuation.

[0020] Optional, also includes: S80: Control the injection molding equipment to pause injection and collect and repair injection pressure based on abnormal location; S81: Calculate the correction pressure difference by combining the repair injection pressure and the correction pressure; S82: Determine the repair time threshold based on the cavity area and collect the actual repair time; S83: If the corrected pressure difference is not greater than the filling pressure threshold, continue injection molding; S84: If the correction pressure difference is consistently greater than the filling pressure threshold and the actual repair time is greater than the repair time threshold, it is determined to be an unrepairable type. S85: Issues an abnormal alarm signal based on the unrepairable type.

[0021] By adopting the above technical solution, the residual melt pressure after the injection is paused is used to verify the repair status. At the same time, a repair time threshold is set to reduce false judgments caused by the natural decay of residual melt pressure. When it is determined that the repair is not possible, an alarm signal is issued directly.

[0022] Secondly, the present invention provides a multi-layer injection mold with in-mold labeling, which adopts the following technical solution.

[0023] A multi-layer injection mold in-mold labeling molding die, controlled by a multi-layer injection mold in-mold labeling molding method as described in the first aspect, includes a rotary mold mechanism with a moving mold molding insert and a fixed mold mechanism for use in conjunction with the rotary mold mechanism. The fixed mold mechanism is provided with a transparent part molding insert and a colored part molding insert for forming a molding cavity corresponding to the moving mold molding insert. The transparent part molding insert has a molding concave surface that matches the outline of the transparent part. An electromagnet is embedded inside the transparent part molding insert for adsorbing and covering the functional diaphragm at the molding concave surface.

[0024] By adopting the above technical solution, an electromagnet embedded in a transparent molded insert is used to adsorb and cover the molded concave surface between the injection-molded transparent parts, reducing the probability of abnormalities such as warping or wrinkling caused by gravity affecting the functional film.

[0025] Optionally, the fixed mold mechanism is further provided with a glue injection component for docking with external injection molding equipment and introducing product raw materials into the molding cavity; The glue injection component includes a colored material gate sleeve for introducing colored material into the colored part molding insert and a transparent material gate sleeve for introducing transparent material into the transparent part molding insert.

[0026] By adopting the above technical solution and utilizing the separate flow design of the colored material gate sleeve and the transparent material gate sleeve, the raw materials of the colored part and the transparent part are fed independently and separately, and the layered injection molding is completed in a precise manner corresponding to different molding cavities.

[0027] In summary, the present invention has at least one of the following beneficial technical effects: During the injection molding process, actual injection molding data is collected and compared with standard injection molding data to determine the real-time status of the functional diaphragm in the cavity. Then, when the functional diaphragm undergoes minor abnormal deformation, the electromagnetic force of the electromagnet used to adsorb the functional diaphragm is adjusted to complete the repair of the abnormal situation, effectively reducing problems such as functional diaphragm warping and wrinkling during the injection molding process. The severity of deformation at abnormal locations is matched with the base current, and then targeted repairs are made based on different deformation types. For warped deformation, the corresponding electromagnets at all abnormal locations are adjusted to magnetically attract and adhere the warped parts. For wrinkled deformation, the adjustment is made according to the direction of wrinkle extension to achieve the effect of dragging the wrinkled parts to both sides. By using an electromagnet embedded in a transparent molded insert, a functional diaphragm is attracted between the injection-molded transparent parts and covers the molded concave surface, reducing the probability of abnormalities such as warping or wrinkling caused by gravity affecting the functional diaphragm. Attached Figure Description

[0028] Figure 1 This is a disassembly diagram of a multi-layer injection mold for in-mold labeling, as described in this application. Figure 1 ; Figure 2 This is a partial schematic diagram of a multi-layer injection mold for labeling and molding, as described in this application. Figure 3 yes Figure 1 Enlarged view of point A in the middle; Figure 4 This is a disassembly diagram of a multi-layer injection mold for in-mold labeling, as described in this application. Figure 2 ; Figure 5 This is a schematic diagram of the product structure of a multi-layer injection mold for labeling and molding, as described in this application.

[0029] The parts referred to by the numbers in the above figures are as follows: 1. Rotary mold mechanism; 11. Moving mold molding insert; 2. Fixed mold mechanism; 21. Transparent part molding insert; 22. Colored part molding insert; 23. Glue injection component; 231. Colored material sprue sleeve; 232. Transparent material sprue sleeve; 3. Molding cavity; 4. Product; 41. First transparent part; 42. Second transparent part; 43. Colored part; 44. Functional diaphragm. Detailed Implementation

[0030] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0031] Reference Figure 5The product 4 produced includes a first transparent part 41, a second transparent part 42 and a colored part 43 arranged in sequence. A functional film 44 is provided between the second transparent part 42 and the colored part 43. The functional film 44 is a transparent film with ferromagnetism, such as an iron-cobalt alloy-aluminum fluoride composite film.

[0032] This invention discloses a multi-layer injection mold with in-mold labeling.

[0033] Reference Figure 1 and Figure 2 A multi-layer injection mold for labeling includes a rotary mold mechanism 1 and a fixed mold mechanism 2. The fixed mold mechanism 2 is used in conjunction with the rotary mold mechanism 1. The fixed mold mechanism 2 is fixedly arranged. The rotary mold mechanism 1 can perform indexing rotation relative to the fixed mold mechanism 2 and linear movement towards or away from the fixed mold mechanism 2.

[0034] Three moving mold forming inserts 11 are provided on the side of the rotary mold mechanism 1 near the fixed mold mechanism 2. The three moving mold forming inserts 11 are evenly arranged circumferentially along the rotation axis of the rotary mold mechanism 1 and are rotationally symmetrical. The rotational overlap angle of the three moving mold forming inserts 11 is 120 degrees.

[0035] Reference Figure 2 and Figure 3 The fixed mold mechanism 2 is provided with a transparent part molding insert 21 and a colored part molding insert 22 on the side near the rotary mold mechanism 1, which cooperate with the moving mold molding insert 11 to form the molding cavity 3. There are two transparent part molding inserts 21 and one colored part molding insert 22. The transparent part molding insert 21 and the colored part molding insert 22 are provided one-to-one with the three moving mold molding inserts 11. The transparent part molding insert 21 and the colored part molding insert 22 have molding concave surfaces on the side near the moving mold molding insert 11. The molding concave surfaces on the two transparent part molding inserts 21 match the contours of the first transparent part 41 and the second transparent part 42, respectively. The molding concave surface of the colored part molding insert 22 matches the contour of the colored part 43. An electromagnet is embedded in the transparent part molding insert 21 corresponding to the second transparent part 42. The electromagnet is used to attract and cover the functional film 44 on the molding concave surface before injection molding the second transparent part 42.

[0036] Reference Figure 2 and Figure 4 The fixed mold mechanism 2 is provided with a sprue 23 on the side away from the rotary mold mechanism 1. The sprue 23 is used to introduce the raw material of product 4 into the molding cavity 3. The sprue 23 includes a colored sprue sleeve 231 and a transparent sprue sleeve 232. Both the colored sprue sleeve and the transparent sprue sleeve are connected to the external injection molding equipment. The colored sprue sleeve 231 is connected to the colored part molding insert 22, and the transparent sprue sleeve is connected to both transparent part molding inserts 21.

[0037] The rotary mold mechanism 1 and the fixed mold mechanism 2 are closed. The moving mold molding insert 11 is attached to the transparent part molding insert 21 corresponding to the first transparent part 41, forming a molding cavity 3 corresponding to the first transparent part 41. The external injection molding equipment is driven to introduce transparent raw material through the transparent material sprue sleeve 232 into the molding cavity 3 corresponding to the first transparent part 41. After the first transparent part 41 cools and solidifies, the rotary mold mechanism 1 and the fixed mold mechanism 2 are separated. The rotary mold mechanism 1 is driven to rotate 120 degrees. The moving mold molding insert 11 drives the first transparent part 41 to move synchronously. The functional diaphragm 44 is placed on the molding concave surface of the transparent part molding insert 21 corresponding to the second transparent part 42 by a robot. The electromagnet is activated to attract the functional diaphragm 44 to keep it covering the molding concave surface. After the rotary mold mechanism 1 and the fixed mold mechanism 2 are closed, the first transparent part 41 is inserted into the molding cavity 3 corresponding to the second transparent part 42. The transparent part 41, the second transparent part 42, and the functional diaphragm 44 form the molding cavity 3 corresponding to the second transparent part 42. The injection molding equipment introduces the transparent raw material into the molding cavity 3 corresponding to the second transparent part 42 through the transparent material sprue sleeve 232. The first transparent part 41, the second transparent part 42 and the functional diaphragm 44 are tightly connected. The rotary mold mechanism 1 opens the mold again and closes the mold after rotating 120 degrees. The first transparent part 41, the second transparent part 42 and the functional diaphragm 44 are inserted into the colored part molding insert 22 and form the molding cavity 3 corresponding to the colored part 43. The injection molding equipment introduces the colored raw material into the molding cavity 3 corresponding to the colored part 43 through the colored material sprue sleeve 231. After cooling and molding, the mold is opened and the product 4 is taken out. The rotary mold mechanism 1 continues to rotate to complete the cycle. When the mold is closed, the injection molding equipment injects glue into the three molding cavities 3 at the same time.

[0038] Based on the same inventive concept, embodiments of the present invention provide a method for in-mold labeling molding of multi-layer injection molds.

[0039] A method for in-mold labeling molding of multi-layer injection molding includes the following steps: S10: Responds to the injection signal, collects actual injection data, and obtains product and mold information.

[0040] The injection signal is the trigger information for starting the injection process of the injection molding machine; the operator actively issues the command by clicking the start button on the control panel, and the system then issues the injection signal.

[0041] Actual injection molding data refers to the data collected in real time during the injection molding process that reflects the injection molding status, including injection pressure and injection time. Actual injection molding data is obtained by collecting and integrating data in real time through detection elements such as pressure sensors and temperature sensors built into the injection molding machine.

[0042] Product information refers to the design parameter information of the product to be formed 4, including product size, product material, etc.; the operator obtains the product information in advance by calling and matching the product 4 model and enters it into the system, and can retrieve it directly when needed.

[0043] Mold information refers to the structural and parameter information of injection molds, including cavity data, electromagnet placement and numbering, etc. The operator obtains the mold information in advance by calling the mold model and enters it into the system, and retrieves it directly when needed.

[0044] S11: Determine standard injection molding data based on product information and mold information.

[0045] Standard injection molding data refers to the baseline process data for normal molding based on matching product information and mold information, including standard injection molding curves, standard average pressure, filling pressure threshold, etc. The baseline data is obtained by finite element simulation of the molding process, and the baseline data is integrated to obtain standard injection molding data.

[0046] S12: Read the standard injection curve from the standard injection data and the actual injection pressure from the actual injection data.

[0047] A standard injection molding curve is a curve showing how injection pressure changes with injection time during normal injection molding; the standard injection molding curve can be obtained directly from standard injection molding data.

[0048] Actual injection pressure refers to the pressure data collected in real time by a pressure sensor during the injection process; the actual injection pressure is obtained in real time by a pressure sensor pre-installed at the nozzle of the injection molding machine.

[0049] S13: Determine the cold stock content by combining the standard injection molding curve and the actual injection pressure.

[0050] The cold material content refers to the volume of the cold melt that is not completely melted in the runner during the initial stage of injection molding; the specific method for obtaining it will be disclosed in detail in subsequent steps and will not be repeated here.

[0051] S14: Determine abnormal data based on cold material content and standard injection molding curve.

[0052] Abnormal data refers to data in which the deviation between actual injection molding data and standard injection molding data exceeds the allowable range; the specific method for obtaining this data will be disclosed in detail in subsequent steps and will not be elaborated here.

[0053] S15: Determine the repair type based on abnormal data. The repair type includes repairable types.

[0054] Repair type refers to the anomaly handling method determined based on abnormal data, including two types: repairable and unrepairable. The specific method for obtaining it will be disclosed in detail in subsequent steps, and will not be repeated here.

[0055] S16: Based on the repairable type, obtain the abnormal location and abnormal difference value according to the abnormal data.

[0056] Abnormal location refers to the specific spatial location where the functional membrane 44 undergoes deformation such as wrinkling or warping; the specific method for obtaining this information will be disclosed in detail in subsequent steps and will not be repeated here.

[0057] Anomalies refer to the deviations between actual injection molding parameters and standard injection molding parameters. In this case, the filling pressure difference in the abnormal data is taken as the anomaly. The specific calculation method for the filling pressure difference will be disclosed in detail in subsequent steps and will not be repeated here.

[0058] S17: Match the electromagnetic number according to the abnormal location, and match the magnetic parameters corresponding to the electromagnetic number according to the abnormal difference.

[0059] Electromagnetic number refers to the unique identification number of each electromagnet installed in the cavity of the mold. Each number corresponds to a fixed cavity position and electromagnet. The operator obtains the electromagnetic number and coordinate data of all electromagnets from the mold information in advance and enters them into the system. When needed, the corresponding electromagnetic number can be obtained by matching the coordinate data of abnormal positions.

[0060] The magnetic force parameter refers to the key parameter of the diaphragm 44 that drives the electromagnet to adjust the magnetic force to achieve the leveling function; the specific method of obtaining it will be disclosed in detail in the following steps, and will not be repeated here.

[0061] S18: The repair command is obtained and executed by combining the electromagnetic number and its corresponding magnetic parameters.

[0062] A repair command is a command used to control an electromagnet to adjust its magnetic force based on corresponding magnetic parameters; the repair command is obtained by integrating the electromagnet number and its corresponding magnetic parameters.

[0063] The method for identifying outlier data includes the following steps: S20: Determine the filling section curve and injection section curve based on the standard injection molding curve.

[0064] The filling curve refers to the curve segment in the standard injection molding curve that corresponds to the stage when the molten plastic gradually fills the cavity from the runner. The standard injection molding curve is divided into injection stages, with the time when the molten plastic enters the cavity as the starting point and the time when the cavity is filled as the ending point. This segment is used as the filling curve. Since the pressure feedback change of the molten plastic when flowing through the runner and entering the cavity is significant, the abrupt change point of the filling curve is used as the starting point until the filling is completed. This can be directly used as the filling curve. At the same time, the runner volume and cavity volume in the mold information can be used for verification in combination with the injection time.

[0065] The injection segment curve refers to the curve segment in the standard injection molding curve that corresponds to the stage from the start of injection to the entry of molten plastic into the cavity. The standard injection molding curve is divided according to the injection stage, with the start of the injection process as the starting point and the time when the molten plastic enters the cavity as the ending point. This segment is used as the injection segment curve. Similar to the filling segment curve, the segment from the start of injection to the point of abrupt change can be directly used as the injection segment curve.

[0066] S21: The correction time and correction pressure are obtained by combining the cold material content and the filling section curve.

[0067] Correction duration refers to the effective injection molding time after adjustments based on cold material content and filling curve to compensate for the influence of cold material. The higher the cold material content, the higher the correction coefficient. The corresponding correction coefficient is obtained from the correction correspondence table based on the cold material content. The correction correspondence table is a data table that records different cold material contents and their corresponding correction coefficients. It is obtained by technicians through pre-testing. When the cold material content is 0, the corresponding correction coefficient is 1. The correction duration is calculated by multiplying the correction duration and the correction coefficient.

[0068] Correction pressure refers to the target injection pressure adjusted based on the cold material content and filling curve to compensate for the influence of cold material; the correction pressure is calculated by multiplying the correction pressure with the correction coefficient.

[0069] Because of the presence of cold material in the runner, the cold material will occupy the space of the runner during the injection molding process, increasing the flow resistance of the molten plastic. In order to maintain a constant injection speed, the injection pressure needs to be corrected. Under this influence, the standard data of the filling section curve needs to be corrected.

[0070] S22: Read the injection time from the actual injection data, and calculate the filling pressure difference by subtracting the correction pressure from the actual injection pressure based on the same correction time and injection time.

[0071] Injection time refers to the injection time continuously collected during the injection process; it is timed in real time by a timer, starting from the time the injection signal is triggered until the injection ends, and the duration within this time period is the injection time.

[0072] The filling pressure difference refers to the deviation between the actual injection pressure and the corresponding correction pressure under the same injection duration and correction duration. Select the same injection duration and correction duration, calculate the difference between the corresponding correction pressure and the actual injection pressure, and take the absolute value as the filling pressure difference.

[0073] S23: When the filling pressure difference is not less than the preset filling pressure threshold, the filling pressure difference and its corresponding injection time and actual injection pressure are defined as abnormal data.

[0074] The filling pressure threshold is the critical value for judging whether the injection pressure is abnormal. The filling pressure threshold is obtained by calibrating multiple experiments based on standard injection data. That is, multiple injections are performed under standard working conditions and the maximum deviation value of the injection pressure is obtained. After multiple tests, the maximum value is selected as the filling pressure threshold.

[0075] If the filling pressure difference is not less than the filling pressure threshold, it means that the actual injection pressure deviates too much from the target pressure, which indicates that an abnormal situation has occurred during the injection process. In this implementation, this is manifested as the functional diaphragm 44 shifting or wrinkling. Therefore, the filling pressure difference, its corresponding injection time, and the actual injection pressure are all defined as abnormal data.

[0076] Since the functional diaphragm 44 is located inside the molding cavity 3, when the molten plastic flows through the runner, it will not affect the functional diaphragm 44. The change in injection pressure at this time must be due to the influence of the cold material. When the molten plastic enters the molding cavity 3, the influence of the cold material on the injection pressure has been eliminated. The change in injection pressure at this time can be determined as wrinkling or displacement of the functional diaphragm 44.

[0077] The method for determining the cold feed content includes the following steps: S30: Determine the corresponding standard average pressure based on the injection section curve.

[0078] The standard average pressure refers to the average pressure value corresponding to the injection segment curve over the injection time. The standard average pressure is calculated by integrating the pressure value of the injection segment curve and then dividing the result by the injection time.

[0079] S31: Determine the injection fluctuation value based on the actual injection pressure.

[0080] Injection fluctuation value refers to the change in actual injection pressure per unit time. All actual injection pressures in the injection segment curve are extracted, and the difference between the previous actual injection pressure and the current actual injection pressure is calculated based on the unit time. The result is then divided by the unit time to calculate the injection fluctuation value corresponding to the current injection duration. Each injection duration corresponds to one injection fluctuation value.

[0081] S32: When the injection fluctuation value is not less than the preset fluctuation threshold, the injection duration at this time shall be taken as the fluctuation duration.

[0082] The fluctuation threshold is the critical value used to determine whether the fluctuation of injection pressure exceeds the normal range. The operator reads the set value of the pressure fluctuation range from the standard injection data in advance, and enters 1.5 times the set value as the fluctuation threshold into the system. It is directly retrieved when needed. In this embodiment, 1.5 times is used, but other multiples can also be used in other embodiments.

[0083] If the injection molding fluctuation value is not less than the fluctuation threshold, it means that the actual injection molding pressure has fluctuated drastically, which means that cold material has appeared in the runner at this time.

[0084] Fluctuation duration refers to the cumulative time from the start of the injection signal to the current acquisition time; when the injection fluctuation value is not less than the fluctuation threshold, the injection duration at the current time is obtained and this data is directly used as the fluctuation duration.

[0085] S33: Determine the actual average pressure by combining the fluctuation duration and the corresponding actual injection pressure.

[0086] The actual average pressure refers to the arithmetic mean of all actual injection pressures within the fluctuation period; the actual average pressure is obtained by summing all actual injection pressure data within the fluctuation period and then dividing by the number of data collections.

[0087] Since cold material usually appears in sheets, it can be determined that before the injection fluctuation value is not less than the fluctuation threshold, the actual injection pressure has already exceeded the standard pressure, but it has not been collected by the injection fluctuation value determination method. Therefore, at this time, all the previous average data are used to calculate the cold material content, making the calculation result more accurate.

[0088] S34: The pressure difference is calculated based on the standard average pressure and the actual average pressure.

[0089] Pressure difference refers to the deviation between the standard average pressure and the actual average pressure; it is calculated by subtracting the standard average pressure from the actual average pressure and then taking the absolute value of the result.

[0090] S35: Determine the cold material content based on the pressure difference.

[0091] The corresponding cold material content can be found from the content correspondence table based on the pressure difference. The content correspondence table is a data table that records different pressure differences and their corresponding cold material contents. It is obtained by technicians through pre-testing and recording. The larger the pressure difference, the larger the cold material content. The experimental method can be to actively control different contents of cold material and collect the corresponding pressure difference. The experimental data collected multiple times are summarized to form the content correspondence table.

[0092] The method for determining abnormal locations includes the following steps: S40: Determine the instantaneous flow rate based on the actual injection pressure.

[0093] Instantaneous flow rate refers to the flow velocity of the corresponding molten plastic obtained based on the actual injection pressure. The higher the actual injection pressure, the higher the instantaneous flow rate. The corresponding instantaneous flow rate can be found from the flow rate correspondence table based on the actual injection pressure. The flow rate correspondence table is a data table that records different actual injection pressures and their corresponding instantaneous flow rates. It is obtained by technicians through prior testing and recording.

[0094] S41: Determine the filler content by combining the actual injection pressure, instantaneous flow rate, and injection duration in abnormal data.

[0095] Filler content refers to the actual volume of molten plastic filled according to the instantaneous flow rate during the injection molding process; the cumulative volume of molten plastic is obtained by integrating the instantaneous flow rate over the current injection time, which is the filler content.

[0096] S42: Determine the arrival location based on mold information and filler content.

[0097] The arrival position refers to the specific spatial location within the cavity where the melt reaches during the current injection molding time, determined based on the filler content and the cavity structure in the mold information. The spatial coordinates of the front end of the molten plastic are located, i.e., the arrival position, according to the three-dimensional model of the cavity structure and the filler content, through a volume interpolation algorithm.

[0098] Because the molten plastic flows in sheets within the cavity, it reaches multiple locations.

[0099] S43: Acquire the resonant frequency based on the arrival position.

[0100] The resonant frequency refers to the real-time oscillation frequency of the electromagnet corresponding to the reached position under the detection state; the resonant frequency is obtained by applying an excitation signal of fixed amplitude to the electromagnet corresponding to the reached position and acquiring it through a frequency detector.

[0101] S44: Obtain the standard frequency threshold through mold information.

[0102] The standard frequency threshold refers to the upper limit of the resonant frequency range of the electromagnet when the functional diaphragm 44 is flatly attached to the specified position. The resonant frequencies of each electromagnet are collected under standard working conditions, and the maximum value of all electromagnet frequencies is taken as the standard frequency threshold. This threshold is obtained in advance by the operator and integrated into the mold information. The standard frequency threshold is obtained directly by reading it during use.

[0103] S45: Define the arrival position corresponding to the resonant frequency that is greater than the standard frequency threshold as an abnormal position.

[0104] Since wrinkles and warping of the functional diaphragm 44 only occur in areas where the molten plastic has already passed, mainly due to the impact of the newly arrived melt, resonant frequency analysis of the abnormal arrival location can quickly determine the abnormal location and avoid wasting computing power by detecting invalid areas.

[0105] When the distance between the functional diaphragm 44 and the electromagnet increases, the equivalent inductance of the coil decreases, resulting in an increase in the resonant frequency. Conversely, the resonant frequency decreases. By detecting the direction and amplitude of the frequency shift, the local deformation state of the functional diaphragm 44 can be determined.

[0106] The method for determining the repair type includes the following steps: S50: When the filling pressure difference is less than the preset repair pressure threshold, it is determined to be a repairable type.

[0107] The repair pressure threshold refers to the critical pressure difference value for determining whether the functional diaphragm 44 can be repaired by electromagnetic means. After multiple electromagnetic repair experiments, the maximum filling pressure difference value that can be successfully corrected is recorded and used as the repair pressure threshold value.

[0108] If the filling pressure difference is less than the repair pressure threshold, it means that the abnormality of the functional membrane 44 is relatively mild and the electromagnetic adsorption force can be corrected. Therefore, it is directly judged as a repairable type.

[0109] S510: When the filling pressure difference is not less than the repair pressure threshold, obtain the collection coverage area.

[0110] If the filling pressure difference is not less than the repair pressure threshold, it indicates that the abnormality of functional diaphragm 44 is relatively severe, and it is difficult to directly determine whether it can be repaired. Further judgment is needed by combining the abnormal area and frequency offset.

[0111] The collected coverage area refers to the projected area of ​​the cavity surface that can be covered by the adsorption of a single electromagnet; it is obtained and calculated in advance by the operator according to the electromagnetic force of the electromagnet model and entered into the system, and the collected coverage area is directly read when in use.

[0112] S511: Determine the abnormal coverage area based on the collected coverage area and abnormal location.

[0113] The abnormal coverage area refers to the total projected area covered by the location where the abnormality occurred; the abnormal coverage area is calculated by multiplying the number of abnormal locations with the collected coverage area.

[0114] Since the electromagnets are evenly distributed and do not interfere with each other, the product of the area covered by a single electromagnet and the abnormal location can be approximated as the total area where the abnormal situation occurs.

[0115] S512: The frequency offset is calculated by combining the resonant frequency and the standard frequency threshold.

[0116] Frequency offset refers to the difference between the real-time acquired resonant frequency and the standard frequency threshold. Since the resonant frequency will definitely be larger when the functional diaphragm 44 is abnormal, the frequency offset is a positive number. The frequency offset corresponding to each abnormal position is calculated by subtracting the real-time resonant frequency from the standard frequency threshold.

[0117] S513: Select the largest frequency offset as the center offset.

[0118] The center offset refers to the maximum value among the frequency offsets corresponding to all abnormal locations, reflecting the most severe degree of deformation within the abnormal area; the frequency offsets of all abnormal locations are sorted, and the maximum value is selected as the center offset.

[0119] S514: If the center offset is greater than the preset offset threshold and the abnormal coverage area is greater than the preset area threshold, it is determined to be an unrepairable type; otherwise, it is determined to be a repairable type.

[0120] The offset threshold refers to the critical frequency offset amount that determines the severity of the deformation of the functional diaphragm 44. The minimum frequency offset amount that the functional diaphragm 44 cannot be repaired by electromagnetic means was recorded through multiple experiments, and this value was taken as the offset threshold.

[0121] The area threshold is the critical area value used to determine whether the abnormal area of ​​the label exceeds the repair capability. The maximum abnormal coverage area that the functional diaphragm 44 could not repair through electromagnetic means was recorded through multiple experiments, and this value was taken as the area threshold.

[0122] If the center offset is greater than the offset threshold and the abnormal coverage area is greater than the area threshold, it means that the functional membrane 44 is severely deformed and has a wide range of impact. The electromagnetic adsorption force cannot be corrected, and it is judged as unrepairable. Otherwise, it is judged as repairable.

[0123] Even if the filling pressure difference is not less than the repair pressure threshold, as long as the deformation of the functional diaphragm 44 is not serious or the deformation area is small, it can be repaired by electromagnetic adsorption force.

[0124] The methods for determining repair instructions include: S60: Determine the reference current value based on the abnormal difference value corresponding to the abnormal location.

[0125] The reference current value refers to the working current value that drives the electromagnet to generate magnetic force to complete the repair of the functional diaphragm 44. The corresponding reference current value is retrieved from the current correspondence table according to the abnormal difference value. The current correspondence table is a data table that records different abnormal differences and their corresponding reference current values. It is obtained by technicians through pre-testing and recording. Under standard working conditions, the working current is adjusted to repair the functional diaphragm 44 with different wrinkles based on different abnormal difference values. The working current value corresponding to the abnormal difference value is selected as the working current value that provides good repair without damaging the functional diaphragm 44. The correspondence is integrated to obtain the current correspondence table.

[0126] S61: Determine the deformation type by frequency offset. Deformation types include warping deformation and wrinkling deformation.

[0127] Deformation type refers to the main abnormal morphology of the functional diaphragm 44 that is prone to occur in the cavity, including warping deformation and wrinkling deformation; the specific method of obtaining it will be disclosed in detail in subsequent steps, and will not be repeated here.

[0128] S62: Based on the warping deformation, the repair command is obtained by integrating the electromagnetic number and reference current value corresponding to the abnormal location.

[0129] If the deformation is determined to be warped, the electromagnet is controlled to perform electromagnetic attraction based on the electromagnetic number corresponding to the abnormal position and the reference current value, so that the warped part can be repaired to fit and integrated to obtain the repair command.

[0130] S63: Based on the fold deformation, a local coordinate system is established with the abnormal position corresponding to the center offset as the origin.

[0131] The local coordinate system refers to a planar position coordinate system established along the horizontal and vertical directions of the cavity surface, with the location of the center offset within the abnormal region as the origin. Combining the abnormal location of the maximum frequency offset and referring to the shape inside the cavity, two reference directions, horizontal and vertical, are defined to obtain the local coordinate system.

[0132] S64: Determine the discrete distribution values ​​corresponding to the anomaly location based on the local coordinate system.

[0133] The discrete value of distribution refers to the positional offset difference between each abnormal location and the origin of the local coordinate system. Substitute the coordinates of all abnormal locations into the local coordinate system and calculate the distance difference between each point and the origin, which is the discrete value of the distribution of that point.

[0134] S65: Determine the fold extension direction and influence coefficient by distributing discrete values.

[0135] The fold extension direction refers to the trend of the arrangement of the folds of the functional diaphragm 44 on the cavity surface; the fold extension direction is obtained by statistically analyzing the arrangement pattern of all discrete values ​​and the orientation of the concentrated discrete values.

[0136] The influence coefficient refers to the adjustment coefficient used to correct the current required during the repair process based on different distribution dispersion. In the local coordinate system, a straight line is drawn along the direction of the fold extension. The closer to this line, the larger the influence coefficient. The distance data corresponding to each point is calculated based on the distribution dispersion value and the straight line. The corresponding influence coefficient is then retrieved from the influence correspondence table based on the distance data. The influence correspondence table is a data table that records different distance data and their corresponding influence coefficients. It is obtained by technicians through pre-testing. Under standard working conditions, multiple experiments are conducted based on different distance data. Different current magnitudes are applied to each point, and the optimal current value for each point is selected. The optimal current value for each point is then divided by the same base value to obtain the influence coefficient for each point. The influence correspondence table is obtained by comparing the distance data and influence coefficients corresponding to each point.

[0137] S66: Determine the execution current value based on the fold extension direction, influence coefficient, and reference current value.

[0138] The execution current value refers to the actual working current that the electromagnet corresponding to each abnormal position needs to output during repair; the execution current value corresponding to each point is obtained by multiplying the influence coefficient corresponding to each point with the reference current value.

[0139] S67: A repair instruction is obtained by combining the electromagnetic number corresponding to the abnormal location and the execution current value.

[0140] The method for determining the deformation type includes the following steps: S70: Determine the cavity area by combining abnormal location and mold information.

[0141] Cavity regions refer to different structural locations within the mold cavity, including the cavity center and corners. The coordinates of different cavity regions are directly obtained from the mold information, and the coordinates of abnormal locations are compared to determine the cavity region at the abnormal location.

[0142] S71: Based on cavity region matching interference coefficient.

[0143] The interference coefficient is a coefficient used to compensate for the deviation of the detection signal caused by the internal structure of different cavity regions. Based on the cavity region, the corresponding interference coefficient is directly retrieved from the database. For example, the center position of the cavity is directly set to 1, and the corner position of the cavity is set to 1.2. This data is obtained by the operator through calibration experiments in advance. The closer to the edge position or the position with a larger structural curvature, the stronger the disturbance of the melt flow, and the larger the value of the interference coefficient.

[0144] S72: Determine the frequency fluctuation coefficient and frequency averaging coefficient based on the frequency offset and interference coefficient.

[0145] The frequency fluctuation coefficient is a quantitative data reflecting the degree of fluctuation in frequency offset. It is calculated by taking the quotient of the standard deviation of the frequency offset and the average value of the frequency offset, and then multiplying the calculated structure with the interference coefficient to obtain the frequency fluctuation coefficient.

[0146] The frequency average coefficient is the average value of all frequency offsets within the same abnormal region. The frequency average coefficient is calculated by summing all frequency offsets and dividing the result by the number of abnormal locations. This value is also the average value in the process of calculating the frequency fluctuation coefficient.

[0147] S73: Filter frequency offsets that are not less than the average frequency coefficient and obtain the corresponding number of out-of-range values.

[0148] The number of out-of-standard items refers to the number of abnormal locations far from the cavity surface within the abnormal area; compare the frequency offset corresponding to all abnormal locations with the average frequency coefficient, and count the number of frequency offsets that are not less than the average frequency coefficient, i.e., the number of out-of-standard items.

[0149] S74: Get the total number of abnormal locations.

[0150] The total number refers to the total number of all detected abnormal locations within the current abnormal area; the number is counted in advance when abnormal locations are identified, and the total number is directly read from the system when needed.

[0151] S75: If the number of exceeding the standard is not less than half of the total number and the frequency fluctuation coefficient is less than the preset fluctuation coefficient threshold, it is determined to be a warping deformation.

[0152] The fluctuation coefficient threshold is a critical judgment value used to distinguish between the wrinkled and raised states of the functional diaphragm 44. The fluctuation coefficient threshold is obtained by the operator in advance through experimental calibration based on the molding process and the material of the functional diaphragm 44 and then entered into the system. It can be directly read when in use.

[0153] If the number of points exceeding the standard is not less than half of the total number and the frequency fluctuation coefficient is less than the fluctuation coefficient threshold, it means that most points in the abnormal area have larger gaps. At the same time, the gaps are uniform and stable overall. This indicates that the functional diaphragm 44 has a localized detachment from the cavity and is in a warped state. Therefore, it can be directly determined as warped deformation.

[0154] S76: If the number of exceeding the standard is less than half of the total number and the frequency fluctuation coefficient is not less than the fluctuation coefficient threshold, it is determined to be a wrinkled deformation.

[0155] If the number of points exceeding the standard is less than half of the total number and the frequency fluctuation coefficient is not less than the fluctuation coefficient threshold, it means that most points in the abnormal area have not broken out of the fit, but the overall gap size fluctuates significantly. If the functional diaphragm 44 has a local stacked and bent wrinkled state, it can be directly judged as wrinkled deformation.

[0156] When the functional diaphragm 44 is raised, a relatively uniform air gap is formed between the functional diaphragm 44 and the electromagnet, which causes the overall inductance of the electromagnet coil to decrease and the overall resonant frequency to rise uniformly. Therefore, the frequency offset is large and the frequency fluctuation coefficient is small. When the functional diaphragm 44 is wrinkled, the functional diaphragm 44 is partially attached to the inner wall of the cavity and partially suspended, which causes the inductance of each electromagnet to change inconsistently, thus presenting a state of large resonant frequency fluctuation.

[0157] It also includes the following steps: S80: Control the injection molding equipment to pause injection and collect and repair injection pressure based on abnormal location.

[0158] Repair injection pressure refers to the injection pressure value collected at each abnormal location during the process of pausing the operation of the injection molding equipment and controlling the electromagnet to execute the repair command; the repair injection pressure is obtained in real time by a pressure sensor pre-installed at the nozzle of the injection molding machine.

[0159] S81: Calculate the correction pressure difference by combining the repair injection pressure and the correction pressure.

[0160] The corrected pressure difference refers to the deviation between the actual collected injection pressure and the preset pressure under standard working conditions; the difference between the repair injection pressure and the corrected pressure is calculated and the absolute value is taken, which is the corrected pressure difference.

[0161] S82: Determine the repair time threshold based on the cavity area and collect the actual repair time.

[0162] The repair time threshold refers to the longest repair time allowed during the repair process. The operator sets the basic value in advance according to the molding process requirements of product 4 and enters it into the system. When using it, the basic value is directly retrieved and modified based on the cavity area. For example, the basic value is directly used as the repair time threshold for the center position of the cavity, while the repair of the corner position of the cavity is more difficult and the repair progress is slower. Therefore, 1.2 times the basic value is used as the repair time threshold.

[0163] The actual repair time refers to the actual repair execution time from the start of electromagnetic repair until the current state; the actual repair time is obtained in real time through the timing module while the repair command is being executed.

[0164] S83: If the corrected pressure difference is not greater than the filling pressure threshold, continue injection molding.

[0165] If the corrected pressure difference is no greater than the filling pressure threshold, it means that the functional diaphragm 44 gradually fits into the cavity under the action of electromagnetic force, so that the corrected pressure difference gradually returns to a state that is no greater than the filling pressure threshold, that is, the repair is complete and injection molding can continue.

[0166] When injection stops, the molten plastic has not cooled down due to the closed cavity, and static injection pressure still remains inside. This value will gradually decrease, so it is necessary to limit the repair time threshold to avoid the situation where the repair pressure difference is not greater than the filling pressure threshold, which is caused by its natural decay.

[0167] S84: If the corrected pressure difference is consistently greater than the filling pressure threshold and the actual repair time is greater than the repair time threshold, it is determined to be an unrepairable type.

[0168] If the correction pressure difference is consistently greater than the filling pressure threshold and the actual repair time is greater than the repair time threshold, it means that the functional diaphragm 44 could not be repaired by electromagnetic force within the time limit. In other words, it is determined that it cannot be repaired and is classified as an unrepairable type. The same processing is performed as the type determined in S514.

[0169] S85: Issues an abnormal alarm signal based on the unrepairable type.

[0170] An abnormal alarm signal is an audible and visual prompt that is output when the abnormal situation is determined to be beyond repair by the system itself. When the system determines that the situation is beyond repair, it will automatically issue an abnormal alarm signal, thereby triggering a preset alarm program.

[0171] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A method for in-mold labeling molding of multi-layer injection molds, characterized in that, include: S10: Responds to the injection signal, collects actual injection data, and obtains product and mold information; S11: Determine standard injection molding data based on product information and mold information; S12: Read the standard injection curve from the standard injection data and the actual injection pressure from the actual injection data; S13: Determine the cold stock content by combining the standard injection molding curve and the actual injection pressure; S14: Determine abnormal data based on cold material content and standard injection molding curve; S15: Determine the repair type based on abnormal data; the repair type includes repairable types. S16: Based on the repairable type, obtain the anomaly location and anomaly difference from the abnormal data; S17: Match the electromagnetic number according to the abnormal location, and match the magnetic parameters corresponding to the electromagnetic number according to the abnormal difference; S18: The repair command is obtained and executed by combining the electromagnetic number and its corresponding magnetic parameters.

2. The multi-layer injection mold in-mold labeling molding method according to claim 1, characterized in that, Methods for identifying outlier data include: S20: Determine the filling section curve and injection section curve based on the standard injection molding curve; S21: The correction time and correction pressure are obtained by combining the cold material content and the filling section curve; S22: Read the injection time from the actual injection data, and calculate the filling pressure difference by subtracting the correction pressure from the actual injection pressure based on the same correction time and injection time; S23: When the filling pressure difference is not less than the preset filling pressure threshold, the filling pressure difference and its corresponding injection time and actual injection pressure are defined as abnormal data.

3. The multi-layer injection mold in-mold labeling molding method according to claim 2, characterized in that, Methods for determining the cold feed content include: S30: Determine the corresponding standard average pressure based on the injection section curve; S31: Determine the injection fluctuation value based on the actual injection pressure; S32: When the injection fluctuation value is not less than the preset fluctuation threshold, the injection duration at this time shall be taken as the fluctuation duration; S33: Determine the actual average pressure by combining the fluctuation duration and the corresponding actual injection pressure; S34: The pressure difference is calculated based on the standard average pressure and the actual average pressure; S35: Determine the cold material content based on the pressure difference.

4. The multi-layer injection mold in-mold labeling molding method according to claim 2, characterized in that, Methods for determining abnormal locations include: S40: Determine the instantaneous flow rate based on the corrected pressure; S41: Determine the filler content by combining the actual injection pressure, instantaneous flow rate, and injection duration in abnormal data; S42: Determine the arrival location based on mold information and filler content; S43: Acquire the resonant frequency based on the arrival position; S44: Obtain the standard frequency threshold through mold information; S45: Define the arrival position corresponding to the resonant frequency that is greater than the standard frequency threshold as an abnormal position.

5. The multi-layer injection mold in-mold labeling molding method according to claim 4, characterized in that, Methods for determining the type of repair include: S50: When the filling pressure difference is less than the preset repair pressure threshold, it is determined to be a repairable type; S510: When the filling pressure difference is not less than the repair pressure threshold, obtain the collection coverage area; S511: Determine the abnormal coverage area based on the collected coverage area and the abnormal location; S512: The frequency offset is calculated by combining the resonant frequency and the standard frequency threshold; S513: Select the largest frequency offset as the center offset; S514: If the center offset is greater than the preset offset threshold and the abnormal coverage area is greater than the preset area threshold, it is determined to be an unrepairable type; otherwise, it is determined to be a repairable type.

6. The multi-layer injection mold in-mold labeling molding method according to claim 5, characterized in that, The methods for determining repair instructions include: S60: Determine the reference current value based on the abnormal difference value corresponding to the abnormal location; S61: Determine the deformation type by frequency offset. Deformation types include warping deformation and wrinkling deformation. S62: Based on the warping deformation, the repair command is obtained by integrating the electromagnetic number and reference current value corresponding to the abnormal location; S63: Based on the fold deformation, a local coordinate system is established with the abnormal position corresponding to the center offset as the origin; S64: Determine the discrete distribution values ​​corresponding to the anomaly locations based on the local coordinate system; S65: Determine the fold extension direction and influence coefficient by distributing discrete values; S66: Determine the execution current value based on the fold extension direction, influence coefficient, and reference current value; S67: A repair instruction is obtained by combining the electromagnetic number corresponding to the abnormal location and the execution current value.

7. The multi-layer injection mold in-mold labeling molding method according to claim 6, characterized in that, Methods for determining the type of deformation include: S70: Determine the cavity area by combining abnormal location and mold information; S71: Based on cavity region matching interference coefficient; S72: Determine the frequency fluctuation coefficient and frequency averaging coefficient based on the frequency offset and interference coefficient; S73: Filter frequency offsets that are not less than the average frequency coefficient and obtain the corresponding number of out-of-range values; S74: Get the total number of abnormal locations; S75: If the number of exceeding the standard is not less than half of the total number and the frequency fluctuation coefficient is less than the preset fluctuation coefficient threshold, it is determined to be a warping deformation. S76: If the number of exceeding the standard is less than half of the total number and the frequency fluctuation coefficient is not less than the fluctuation coefficient threshold, it is determined to be a wrinkled deformation.

8. The multi-layer injection mold in-mold labeling molding method according to claim 7, characterized in that, Also includes: S80: Control the injection molding equipment to pause injection and collect and repair injection pressure based on abnormal location; S81: Calculate the correction pressure difference by combining the repair injection pressure and the correction pressure; S82: Determine the repair time threshold based on the cavity area and collect the actual repair time; S83: If the corrected pressure difference is not greater than the filling pressure threshold, continue injection molding; S84: If the correction pressure difference is consistently greater than the filling pressure threshold and the actual repair time is greater than the repair time threshold, it is determined to be an unrepairable type. S85: Issues an abnormal alarm signal based on the unrepairable type.

9. A multi-layer injection mold for in-mold labeling, controlled by a multi-layer injection mold for in-mold labeling as described in any one of claims 1 to 8, characterized in that, It includes a rotary mold mechanism (1) having a moving mold forming insert (11) and a fixed mold mechanism (2) for use in conjunction with the rotary mold mechanism (1); The fixed mold mechanism (2) is provided with a transparent part molding insert (21) and a colored part molding insert (22) for forming a molding cavity (3) corresponding to the moving mold molding insert (11). The transparent part molding insert (21) has a molding concave surface that matches the outline of the transparent part. An electromagnet is embedded inside the transparent part molding insert (21) for adsorbing and covering the functional diaphragm (44) at the molding concave surface.

10. A multi-layer injection mold for in-mold labeling as described in claim 9, characterized in that, The fixed mold mechanism (2) is also provided with a glue injection component (23) for docking with external injection molding equipment and introducing the raw material of product (4) into the molding cavity (3); The glue injection component (23) includes a colored material sprue sleeve (231) for introducing colored material into the colored part molding insert (22) and a transparent material sprue sleeve (232) for introducing transparent material into the transparent part molding insert (21).

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