Injection molding production process of plastic composite material

Abstract

The invention relates to the technical field of plastic injection molding, in particular to an injection molding production process of a plastic composite material. According to the technical scheme, the injection molding process comprises a raw material selection module, a raw material hot melting module, a raw material conveying module, a molding module, a mold cavity detection module and a workpiece detection module, by arranging the mold cavity detection module and the raw material conveying module, the effect of improving the quality of the workpiece is achieved, and the bubble storage amount in the molded workpiece is detected; the device is simple in structure and convenient to operate, workers can be helped to adjust equipment in time, the pressure in the melt injection process is detected, bubbles in a melt material in the extrusion process are reduced, and therefore the quality of a workpiece after curing forming can be improved.

Description

Technical Field

[0001] The invention relates to the technical field of plastic injection molding, in particular to an injection molding production process of a plastic composite material. Background Art

[0002] Plastic composites are new materials with improved performance obtained by combining different types of plastics or other materials. Plastic composites are composed of two or more materials with different properties, which are combined on a macro scale to form materials with new properties. Usually, each material in the composite maintains its independence while working together to optimize the specific properties of the final product. Plastic composites need to be produced by injection molding. The injection molding process can be divided into six basic stages: mold closing, injection, pressure holding, cooling, mold opening and product removal. These stages directly determine the molding quality of the final product.

[0003] Patent announcement number CN114106568A discloses an injection molding process for a plastic composite material, which includes the following steps: S1, placing plastic raw materials, fillers, toughening agents, reinforcing agents, flame retardants, antistatic agents, wear-resistant agents and insulating agents into a collection dish according to the formula ratio; S2, fully stirring and heating the raw materials in step S1; S3, injecting the melted material into an injection molding machine through a screw extruder, and setting the injection molding machine parameters, injecting the material into the injection ports of the movable mold and the fixed mold through the injection head, maintaining pressure, cooling, curing and molding, and finally opening the mold to take out the product; S4, placing the product into a compounding machine and compounding a layer of anti-aging coating on the outer layer of the product; S5, testing the plastic composite material after step S4, screening out good and bad products, putting the bad products into a waste collection box, and the good products proceed to the next process.

[0004] Although the prior art has many benefits during use, it still has the following problems: it lacks a detection structure for the amount of bubbles in the injection molded workpiece, which results in bubbles inside or outside the molded workpiece, affecting the quality of the workpiece and resulting in a high rate of defective products. Summary of the invention

[0005] The object of the present invention is to provide an injection molding production process for a plastic composite material to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an injection molding production process of a plastic composite material, the injection molding process includes a raw material selection module, a raw material hot melting module, a raw material conveying module, a molding module, a mold cavity detection module and a workpiece detection;

[0007] The raw material selection module is configured to pre-process a variety of raw materials, the raw material hot-melt module is configured to melt and pressurize the raw materials, the raw material conveying module is configured to convey the molten raw materials to the interior of the mold, the molding module is configured to solidify and mold the raw materials, the mold cavity detection module is configured to detect the solidified raw materials, and the workpiece detection is configured to detect the quality of the molded workpiece.

[0008] Preferably, the raw material selection module also includes raw material selection, raw material cleaning and raw material drying. The raw materials selected in the raw material selection include: PVC resin particles, reinforced PP materials, glass fibers, flame retardant materials, toughening additives, antistatic additives and wear-resistant additives. The raw material selection adjusts the proportion of multiple raw materials according to the required quality of the molded workpiece;

[0009] The raw material cleaning is configured to clean the surface of the granular raw material, reduce the amount of foreign matter on the surface of the raw material, and maintain the cleanliness of the raw material;

[0010] The raw material drying is constructed to heat and dry the raw materials, the raw material drying temperature is 70-85 degrees, and the raw material drying time is 2-3.5 hours.

[0011] The raw material selection module also includes a raw material stirring device, which is configured to stir and mix different raw materials, and the raw material stirring time is 20-30 minutes.

[0012] Preferably, the raw material hot melting module further includes raw material melting and raw material extrusion, wherein the raw material melting is configured to heat and melt the stirred raw material to make the raw material in a molten state, and the melting temperature of the raw material is 170-280 degrees;

[0013] The raw material extrusion is configured to perform heat preservation extrusion on the raw material, the temperature of the molten raw material is maintained at 180-320 degrees, the screw speed is 300 rpm, and the die pressure is 1.0-8.0 MPa.

[0014] Preferably, the raw material conveying module further comprises a conveying control module, and the conveying control module conveys the raw material melted by the hot melt module to the molding module to inject material into the molding module;

[0015] The conveying control module controls the die pressure to be 6.5 MPa, the flow channel temperature of the conveying control module is controlled to be 220 degrees, and the conveying control module controls the injection speed of the molten raw material into the die to be set to 70 mm / s.

[0016] Preferably, the raw material conveying module further comprises a conveying volume detection module, and the conveying volume detection module is configured to detect the injection volume during the injection process to ensure the amount of molten raw material stored in the mold cavity;

[0017] The raw material conveying module also includes a conveying pressure detection module, the pressure detection module is configured to detect different pressures during injection pressure, and the conveying pressure detection module also includes an injection pressure detection module, a pressure holding pressure detection module, a back pressure detection module, and a reverse pressure detection module;

[0018] The injection pressure detection module is configured to detect the pressure of the raw material entering the mold, and the holding pressure detection module is configured to maintain the pressure of the raw material inside the mold cavity. The holding pressure of the mold cavity is 6.0 MPa.

[0019] The back pressure detection module is configured to detect the back pressure during the extrusion of the raw material, maintain the speed at which the lead screw does not retreat due to the reaction force, maintain the work done by the screw on the molten raw material, eliminate unmelted plastic particles, increase the density and uniformity of the material in the material tube, reduce the injection pressure and warpage deformation, and the back pressure is maintained at 5-15Kg / cm2;

[0020] The back pressure detection module is configured to detect the back pressure of the melt accumulated at the nozzle end of the extruder barrel.

[0021] Preferably, the mold forming module further includes mold cleaning, mold clamping and mold pre-pressing, and the mold cleaning is configured to clean the inner wall of the mold cavity to maintain the cleanliness of the mold cavity;

[0022] The mold clamping is configured to clamp the upper and lower molds and keep the molds locked to ensure the extrusion force between the molds;

[0023] The formula for calculating the clamping force is: Support mold force = projected area of ​​the finished product in the direction of mold opening and closing (cm2) × number of mold holes × mold pressure (kg / cm2);

[0024] The mold pressure is maintained at 350-400 kg / cm2;

[0025] The mold is pressure-sensitive and is configured to detect the internal pressure of the mold cavity to ensure that the internal pressure of the mold cavity meets the requirements.

[0026] Preferably, the mold forming module also includes a cooling module and a demolding module, the cooling module is constructed to cool and solidify the molten raw material inside the mold cavity, the demolding module is constructed to push out the workpiece solidified inside the mold, the demolding module also includes a push rod, the push rod pushes the workpiece inside the mold cavity to move the workpiece out of the mold cavity, and the mold opening pressure is 6.0MPa.

[0027] Preferably, the mold cavity detection module also includes a ray detection module, which is constructed as an X-ray inspection device that uses the penetrating power of X-rays to penetrate the mold to detect holes caused by bubbles inside the workpiece, thereby helping workers understand the quality of the cured workpiece.

[0028] Preferably, the workpiece inspection utilizes visual inspection by staff to inspect the appearance shape of the workpiece to ensure the quality of the workpiece.

[0029] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention achieves the effect of improving the quality of the workpiece by setting a mold cavity detection module and a raw material conveying module, detects the amount of bubbles inside the molded workpiece, helps the staff to adjust the equipment in time, and detects the pressure during the melt injection process, reduces the bubbles in the molten material during the extrusion process, thereby improving the quality of the workpiece after solidification and molding. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the process of the present invention. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] See also Figure 1 , four embodiments provided by the present invention are:

[0033] Embodiment 1: An injection molding production process of a plastic composite material, the injection molding process includes a raw material selection module, a raw material hot melting module, a raw material conveying module, a molding module, a mold cavity detection module and a workpiece detection;

[0034] The raw material selection module is configured to pre-process a variety of raw materials, the raw material hot-melt module is configured to melt and pressurize the raw materials, the raw material conveying module is configured to convey the molten raw materials to the interior of the mold, the molding module is configured to solidify and mold the raw materials, the mold cavity detection module is configured to detect the solidified raw materials, and the workpiece detection is configured to detect the quality of the molded workpiece.

[0035] The raw material selection module also includes raw material selection, raw material cleaning and raw material drying. The raw materials selected in the raw material selection include: PVC resin particles, reinforced PP materials, glass fibers, flame retardant materials, toughening additives, antistatic additives and wear-resistant additives. The raw material selection adjusts the proportion of multiple raw materials according to the required quality of the molded workpiece;

[0036] The raw material cleaning is configured to clean the surface of the granular raw material, reduce the amount of foreign matter on the surface of the raw material, and maintain the cleanliness of the raw material;

[0037] The raw material drying is configured to heat and dry the raw material, the raw material drying temperature is 70-85 degrees, and the raw material drying time is 2-3.5 hours;

[0038] The raw material selection module also includes a raw material stirring device, which is configured to stir and mix different raw materials, and the raw material stirring time is 20-30 minutes.

[0039] Embodiment 2: An injection molding production process of a plastic composite material, the injection molding process includes a raw material selection module, a raw material hot melting module, a raw material conveying module, a molding module, a mold cavity detection module and a workpiece detection;

[0040] The raw material selection module is configured to pre-process a variety of raw materials, the raw material hot-melt module is configured to melt and pressurize the raw materials, the raw material conveying module is configured to convey the molten raw materials to the interior of the mold, the molding module is configured to solidify and mold the raw materials, the mold cavity detection module is configured to detect the solidified raw materials, and the workpiece detection is configured to detect the quality of the molded workpiece.

[0041] The raw material hot melting module also includes raw material melting and raw material extrusion. The raw material melting is configured to heat and melt the stirred raw material to make the raw material in a molten state. The melting temperature of the raw material is 170-280 degrees.

[0042] The raw material extrusion is configured to perform heat preservation extrusion on the raw material, the temperature of the molten raw material is maintained at 180-320 degrees, the screw speed is 300 rpm, and the die pressure is 1.0-8.0 MPa.

[0043] The raw material conveying module also includes a conveying control module, which conveys the raw material melted by the hot melt module to the molding module to inject material into the molding module;

[0044] The conveying control module controls the die pressure to be 6.5 MPa, the flow channel temperature of the conveying control module is controlled to be 220 degrees, and the conveying control module controls the injection speed of the molten raw material into the die to be set to 70 mm / s.

[0045] The raw material conveying module also includes a conveying amount detection module, which is configured to detect the injection amount during the injection process to ensure the amount of molten raw material stored in the mold cavity;

[0046] The raw material conveying module also includes a conveying pressure detection module, the pressure detection module is configured to detect different pressures during injection pressure, and the conveying pressure detection module also includes an injection pressure detection module, a pressure holding pressure detection module, a back pressure detection module, and a reverse pressure detection module;

[0047] The injection pressure detection module is configured to detect the pressure of the raw material entering the mold, and the holding pressure detection module is configured to maintain the pressure of the raw material inside the mold cavity. The holding pressure of the mold cavity is 6.0 MPa.

[0048] The back pressure detection module is configured to detect the back pressure during the extrusion of the raw material, maintain the speed at which the lead screw does not retreat due to the reaction force, maintain the work done by the screw on the molten raw material, eliminate unmelted plastic particles, increase the density and uniformity of the material in the material tube, reduce the injection pressure and warpage deformation, and the back pressure is maintained at 5-15Kg / cm2;

[0049] The back pressure detection module is configured to detect the back pressure of the melt accumulated at the nozzle end of the extruder barrel.

[0050] Embodiment 3: An injection molding production process of a plastic composite material, the injection molding process includes a raw material selection module, a raw material hot melting module, a raw material conveying module, a molding module, a mold cavity detection module and a workpiece detection module;

[0051] The raw material selection module is configured to pre-process a variety of raw materials, the raw material hot-melt module is configured to melt and pressurize the raw materials, the raw material conveying module is configured to convey the molten raw materials to the interior of the mold, the molding module is configured to solidify and mold the raw materials, the mold cavity detection module is configured to detect the solidified raw materials, and the workpiece detection is configured to detect the quality of the molded workpiece.

[0052] The mold forming module also includes mold cleaning, mold clamping and mold pre-pressing, and the mold cleaning is configured to clean the inner wall of the mold cavity to maintain the cleanliness of the mold cavity;

[0053] The mold clamping is configured to clamp the upper and lower molds and keep the molds locked to ensure the extrusion force between the molds;

[0054] The formula for calculating the clamping force is: Support mold force = projected area of ​​the finished product in the direction of mold opening and closing (cm2) × number of mold holes × mold pressure (kg / cm2);

[0055] The mold pressure is maintained at 350-400 kg / cm2;

[0056] The mold is pressure-sensitive and is configured to detect the internal pressure of the mold cavity to ensure that the internal pressure of the mold cavity meets the requirements.

[0057] The mold forming module also includes a cooling module and a demolding module. The cooling module is constructed to cool and solidify the molten raw material inside the mold cavity. The demolding module is constructed to push out the workpiece solidified inside the mold. The demolding module also includes a push rod, which pushes the workpiece inside the mold cavity to move the workpiece out of the mold cavity. The mold opening pressure is 6.0MPa.

[0058] The mold cavity detection module also includes a ray detection module, which is constructed as an X-ray inspection device that uses the penetrating power of X-rays to penetrate the mold to detect holes caused by bubbles inside the workpiece, thereby helping workers understand the quality of the cured workpiece.

[0059] The workpiece inspection utilizes visual inspection by workers to inspect the appearance and shape of the workpiece to ensure the quality of the workpiece.

[0060] Embodiment 4: The injection molding process includes a raw material selection module, a raw material hot melting module, a raw material conveying module, a molding module, a mold cavity detection module and a workpiece detection module;

[0061] The raw material selection module is configured to pre-process a variety of raw materials, the raw material hot-melt module is configured to melt and pressurize the raw materials, the raw material conveying module is configured to convey the molten raw materials to the interior of the mold, the molding module is configured to solidify and mold the raw materials, the mold cavity detection module is configured to detect the solidified raw materials, and the workpiece detection is configured to detect the quality of the molded workpiece.

[0062] The raw material selection module also includes raw material selection, raw material cleaning and raw material drying. The raw materials selected in the raw material selection include: PVC resin particles, reinforced PP materials, glass fibers, flame retardant materials, toughening additives, antistatic additives and wear-resistant additives. The raw material selection adjusts the proportion of multiple raw materials according to the required quality of the molded workpiece;

[0063] The raw material cleaning is configured to clean the surface of the granular raw material, reduce the amount of foreign matter on the surface of the raw material, and maintain the cleanliness of the raw material;

[0064] The raw material drying is configured to heat and dry the raw material, the raw material drying temperature is 70-85 degrees, and the raw material drying time is 2-3.5 hours;

[0065] The raw material selection module also includes a raw material stirring device, which is configured to stir and mix different raw materials, and the raw material stirring time is 20-30 minutes.

[0066] The raw material hot melting module also includes raw material melting and raw material extrusion. The raw material melting is configured to heat and melt the stirred raw material to make the raw material in a molten state. The melting temperature of the raw material is 170-280 degrees.

[0067] The raw material extrusion is configured to perform heat preservation extrusion on the raw material, the temperature of the molten raw material is maintained at 180-320 degrees, the screw speed is 300 rpm, and the die pressure is 1.0-8.0 MPa.

[0068] The raw material conveying module also includes a conveying control module, which conveys the raw material melted by the hot melt module to the molding module to inject material into the molding module;

[0069] The conveying control module controls the die pressure to be 6.5 MPa, the flow channel temperature of the conveying control module is controlled to be 220 degrees, and the conveying control module controls the injection speed of the molten raw material into the die to be set to 70 mm / s.

[0070] The raw material conveying module also includes a conveying amount detection module, which is configured to detect the injection amount during the injection process to ensure the amount of molten raw material stored in the mold cavity;

[0071] The raw material conveying module also includes a conveying pressure detection module, the pressure detection module is configured to detect different pressures during injection pressure, and the conveying pressure detection module also includes an injection pressure detection module, a pressure holding pressure detection module, a back pressure detection module, and a reverse pressure detection module;

[0072] The injection pressure detection module is configured to detect the pressure of the raw material entering the mold, and the holding pressure detection module is configured to maintain the pressure of the raw material inside the mold cavity. The holding pressure of the mold cavity is 6.0 MPa.

[0073] The back pressure detection module is configured to detect the back pressure during the extrusion of the raw material, maintain the speed at which the lead screw does not retreat due to the reaction force, maintain the work done by the screw on the molten raw material, eliminate unmelted plastic particles, increase the density and uniformity of the material in the material tube, reduce the injection pressure and warpage deformation, and the back pressure is maintained at 5-15Kg / cm2;

[0074] The back pressure detection module is configured to detect the back pressure of the melt accumulated at the nozzle end of the extruder barrel.

[0075] The mold forming module also includes mold cleaning, mold clamping and mold pre-pressing, and the mold cleaning is configured to clean the inner wall of the mold cavity to maintain the cleanliness of the mold cavity;

[0076] The mold clamping is configured to clamp the upper and lower molds and keep the molds locked to ensure the extrusion force between the molds;

[0077] The formula for calculating the clamping force is: Support mold force = projected area of ​​the finished product in the direction of mold opening and closing (cm2) × number of mold holes × mold pressure (kg / cm2);

[0078] The mold pressure is maintained at 350-400 kg / cm2;

[0079] The mold is pressure-sensitive and is configured to detect the internal pressure of the mold cavity to ensure that the internal pressure of the mold cavity meets the requirements.

[0080] The mold forming module also includes a cooling module and a demolding module. The cooling module is constructed to cool and solidify the molten raw material inside the mold cavity. The demolding module is constructed to push out the workpiece solidified inside the mold. The demolding module also includes a push rod, which pushes the workpiece inside the mold cavity to move the workpiece out of the mold cavity. The mold opening pressure is 6.0MPa.

[0081] The mold cavity detection module also includes a ray detection module, which is constructed as an X-ray inspection device that uses the penetrating power of X-rays to penetrate the mold to detect holes caused by bubbles inside the workpiece, thereby helping workers understand the quality of the cured workpiece.

[0082] The workpiece inspection utilizes visual inspection by workers to inspect the appearance and shape of the workpiece to ensure the quality of the workpiece.

[0083] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A plastic composite material injection molding production process, characterized in that: The injection molding process includes a raw material selection module, a raw material hot-melt module, a raw material conveying module, a molding module, a mold cavity detection module, and a workpiece detection module; The raw material selection module is configured to pre-process a variety of raw materials, the raw material hot-melt module is configured to melt and pressurize the raw materials, the raw material conveying module is configured to convey the molten raw materials to the interior of the mold, the molding module is configured to solidify and mold the raw materials, the mold cavity detection module is configured to detect the solidified raw materials, and the workpiece detection is configured to detect the quality of the molded workpiece.

2. The injection molding production process of a plastic composite material according to claim 1, characterized in that: The raw material selection module also includes raw material selection, raw material cleaning and raw material drying. The raw materials selected in the raw material selection include: PVC resin particles, reinforced PP materials, glass fibers, flame retardant materials, toughening additives, antistatic additives and wear-resistant additives. The raw material selection adjusts the proportion of multiple raw materials according to the required quality of the molded workpiece; The raw material cleaning is configured to clean the surface of the granular raw material, reduce the amount of foreign matter on the surface of the raw material, and maintain the cleanliness of the raw material; The raw material drying is configured to heat and dry the raw material, the raw material drying temperature is 70-85 degrees, and the raw material drying time is 2-3.5 hours; The raw material selection module also includes a raw material stirring device, which is configured to stir and mix different raw materials, and the raw material stirring time is 20-30 minutes.

3. The injection molding production process of a plastic composite material according to claim 1, characterized in that: The raw material hot melting module also includes raw material melting and raw material extrusion. The raw material melting is configured to heat and melt the stirred raw material to make the raw material in a molten state. The melting temperature of the raw material is 170-280 degrees. The raw material extrusion is configured to perform heat preservation extrusion on the raw material, the temperature of the molten raw material is maintained at 180-320 degrees, the screw speed is 300 rpm, and the die pressure is 1.0-8.0 MPa.

4. The injection molding production process of a plastic composite material according to claim 1, characterized in that: The raw material conveying module also includes a conveying control module, which conveys the raw material melted by the hot melt module to the molding module to inject material into the molding module; The conveying control module controls the die pressure to be 6.5 MPa, the flow channel temperature of the conveying control module is controlled to be 220 degrees, and the conveying control module controls the injection speed of the molten raw material into the die to be set to 70 mm / s.

5. The injection molding production process of a plastic composite material according to claim 1, characterized in that: The raw material conveying module also includes a conveying volume detection module, which is configured to detect the injection volume during the injection process to ensure the amount of molten raw material stored in the mold cavity; The raw material conveying module also includes a conveying pressure detection module, the pressure detection module is configured to detect different pressures during injection pressure, and the conveying pressure detection module also includes an injection pressure detection module, a pressure holding pressure detection module, a back pressure detection module, and a reverse pressure detection module; The injection pressure detection module is configured to detect the pressure of the raw material entering the mold, and the holding pressure detection module is configured to maintain the pressure of the raw material inside the mold cavity. The holding pressure of the mold cavity is 6.0 MPa. The back pressure detection module is configured to detect the back pressure during the extrusion of the raw material, maintain the speed at which the lead screw does not retreat due to the reaction force, maintain the work done by the screw on the molten raw material, eliminate unmelted plastic particles, increase the density and uniformity of the material in the material tube, reduce the injection pressure and warpage deformation, and the back pressure is maintained at 5-15Kg / cm2; The back pressure detection module is configured to detect the back pressure of the melt accumulated at the nozzle end of the extruder barrel.

6. The injection molding production process of a plastic composite material according to claim 1, characterized in that: The mold forming module also includes mold cleaning, mold clamping and mold pre-pressing, and the mold cleaning is configured to clean the inner wall of the mold cavity to maintain the cleanliness of the mold cavity; The mold clamping is configured to clamp the upper and lower molds and keep the molds locked to ensure the extrusion force between the molds; The formula for calculating the clamping force is: Support mold force = projected area of ​​the finished product in the direction of mold opening and closing (cm2) × number of mold holes × mold pressure (kg / cm2); The mold pressure is maintained at 350-400 kg / cm2; The mold is pressure-sensitive and is configured to detect the internal pressure of the mold cavity to ensure that the internal pressure of the mold cavity meets the requirements.

7. The injection molding production process of a plastic composite material according to claim 1, characterized in that: The mold forming module also includes a cooling module and a demolding module. The cooling module is constructed to cool and solidify the molten raw material inside the mold cavity. The demolding module is constructed to push out the workpiece solidified inside the mold. The demolding module also includes a push rod, which pushes the workpiece inside the mold cavity to move the workpiece out of the mold cavity. The mold opening pressure is 6.0MPa.

8. The injection molding production process of a plastic composite material according to claim 1, characterized in that: The mold cavity detection module also includes a ray detection module, which is constructed as an X-ray inspection device that uses the penetrating power of X-rays to penetrate the mold to detect holes caused by bubbles inside the workpiece, thereby helping workers understand the quality of the cured workpiece.

9. The injection molding production process of a plastic composite material according to claim 1, characterized in that: The workpiece inspection utilizes visual inspection by workers to inspect the appearance and shape of the workpiece to ensure the quality of the workpiece.

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