203 results about "Cast films" patented technology

The invention belongs to the technical field of high polymer materials, and particularly relates to a PVB (Polyvinyl Butyral) film and a preparation method thereof. The PVB film provided by the invention is prepared from the following components in parts by mass: 100 parts of PVB resin, 33 to 36 parts of triethylene glycol di-2-ethylhexoate, 7 to 9 parts of integrated anti-radiation toughening filler, 1 to 2 parts of organic montmorillonite, 0.8 to 1.2 parts of composite coupling agent, 0.5 to 1 part of ultraviolet light absorber, 0.6 to 0.8 part of antioxidant and 0.8 to 1 part of heat stabilizer. The integrated anti-radiation toughening filler adopts a core-shell structure, the anti-radiation core is composed of bismuth oxide and tungsten oxide according to the mass ratio of 3: 1, and the elastic coating layer is maleic anhydride grafted modified POE. The preparation method comprises the steps of pre-dispersion treatment, component mixing, melt extrusion, film casting, graded cooling, two-way stretching and the like. Through the core-shell structure design of the integrated anti-radiation toughening filler and the optimized processing technology, the anti-radiation performance and the toughening performance are synergistically improved, and the prepared film has the advantages of excellent anti-radiation effect, high toughness and good transparency.

The invention discloses an automatic cast film defect detection method and system based on an improved YOLOv8 model and a multi-threshold mask segmentation algorithm, and the method comprises the steps: obtaining a defect picture for defect detection through the collection and preprocessing of surface image data of a cast film; a defect detection model based on an improved YOLOv8 model is constructed, the detection precision and stability of the model on a tiny target are improved through an NWD loss function, defect pictures are input into the detection model, and center point coordinates of each prediction defect target frame are output after model detection, so that accurate position information of the defect is provided; according to the predicted position of the defect target frame, extracting the target frame and segmenting the area by adopting a multi-threshold mask segmentation algorithm to obtain a fine defect area and features; and carrying out statistical analysis on the extracted defect features, and generating a batch detection report. According to the invention, automatic detection and classification of the surface defects of the casting film can be realized, and high-precision real-time detection capability is realized.

The invention provides a degradable breathable composite film based on a gradient microporous structure and a preparation method and application thereof, and belongs to the field of protective materials.The preparation method comprises the steps that PLA, PBAT, ADR, CaCO3 and modified master batches are subjected to melt blending in proportion, a three-layer casting film is prepared through three-layer casting film forming equipment, the three-layer casting film is formed through a stretching technology, and a gradient breathable film is obtained; a PLA non-woven fabric is prepared through a melt-blowing or spun-bonding technology; and compounding the gradient breathable film with a PLA non-woven fabric to obtain the degradable breathable composite film based on the gradient microporous structure. The three-layer casting co-extrusion process is adopted, the gradient porosity breathable film and the hydrophilic / hydrophobic design are combined, the comprehensive performance of the protective material is effectively improved, the moisture permeation amount of the material is increased, the hydrostatic pressure of the material is improved, and therefore the barrier property and comfort of the material are enhanced. The blocking layer is made of a porous membrane material formed by stretching PLA and PBAT composite CaCO3, the comfortable layer is made of a PLA spunbond / melt-blown non-woven fabric material, and full degradation of the protective material is achieved.

The invention relates to the technical field of tensile testing of cast films, in particular to a tensile property testing device for a single-layer TPEE cast film, and effectively solves the problems that errors are easy to occur and the efficiency is low due to manual sample preparation, and the efficiency is low and the consistency is poor due to the fact that a sample needs to be manually clamped. Comprising a base, a sample preparation table is fixedly connected to the right side of the upper end of the base, a single-layer cast film is arranged on the sample preparation table, a sample preparation groove is formed in the sample preparation table, a sample preparation cutter is arranged above the sample preparation table, and a driving assembly located below the sample preparation table is arranged in the base; the driving assembly controls the sample preparation cutter and the sample preparation groove to cooperatively act, automatic cutting of a single-layer TPEE cast film is achieved, it is guaranteed that the sizes of samples are consistent, the edges of the samples are flat, the problem of size errors or burrs caused by manual operation is avoided, horizontal movement is converted into vertical cutting action through the linkage design of the stepped driving groove and the moving rod, and the production efficiency of the TPEE cast film is improved. The cutting precision and efficiency are improved, and the problem that traditional manual sample preparation is poor in consistency is solved.

The utility model discloses a cooling mechanism for cast film forming, which relates to the technical field of cast film cooling and comprises a mounting frame, a plurality of rotating shafts are rotatably mounted on the mounting frame, outer rollers are sleeved on the rotating shafts, roller covers are symmetrically arranged at two ends of each outer roller, water-proof cabins are arranged on opposite surfaces of the roller covers, through holes are formed in the rotating shafts, and the outer rollers are sleeved on the rotating shafts. The rotating shaft is provided with a rectangular through hole in the waterproof cabin section; according to the utility model, the mounting frame is matched with the rotating shaft, so that the cooling mechanism can be stably built and flexibly rotated, and the structural stability and the running smoothness are improved; the outer roller is matched with the roller cover and the waterproof cabin, so that a sealed cooling space is conveniently constructed, the sealing performance is improved, and the leakage of cooling liquid is prevented; the rotating shaft through hole is matched with the rectangular through opening and the spiral heat dissipation pipe, so that the cooling liquid uniformly circulates to absorb heat, the cooling uniformity is improved, and the cast film is uniformly cooled; finally, the problem that a traditional cooling mechanism is uneven in cooling is solved, and the cooling effect and production efficiency are improved.

1. The name of the design product: graphical user interface of automatic control system of electronic equipment (casting machine 10). 2. The use of the design product: an electronic device. 3. The design points of the design product: in the graphical user interface. 4. The picture or photo that best indicates the design points: interface change state diagram. 5. The graphical user interface is protected by the design, and the rear view, left view, right view, top view and bottom view are omitted. 6. The use of the graphical user interface: for displaying the working state of the casting machine. 7. The human-computer interaction mode of the graphical user interface: clicking or touching the icon or function button on the screen. 8. The change state of the graphical user interface: after starting, enter the main view interface, click or touch the seventh icon on the left side of the main view interface, enter the interface change state diagram.

The utility model discloses a cast film winding device, relates to the technical field of automatic winding, and aims to solve the problems that the existing cast film winding device in the background technology needs to be laid at the front end, and the efficiency cannot be stably guaranteed. Rotating shafts are arranged at the upper ends of the interiors of the two long vertical supports on each side and the upper ends of the interiors of the two vertical supports on each side, a large roller is arranged outside the portion, between the two long vertical supports on the two sides, of the rotating shafts, a large roller groove is formed in the outer end face of the large roller, and two assembly rotating shafts are arranged in the large roller groove; assembly rollers are arranged outside the two assembly rotating shafts, rotating gears are arranged on the two sides of each assembly rotating shaft, a supporting column is fixed to one side of the interior of the large roller groove, a plurality of springs are connected to the lower end of the supporting column in an array mode in the direction of the assembly rotating shafts, and the other ends of the springs are jointly connected with a movable limiting plate; a plurality of moving guide rails are arranged in the large roller groove in the direction of the rotating shaft of the assembly in an array mode.

The application discloses a method for improving the lamination bubble of MLCC, comprising the following steps: mixing porcelain powder, organic solution, dispersing agent, adhesive and other auxiliary agents in a certain proportion to prepare porcelain slurry required for subsequent preparation; performing electrode printing after the casting operation of the porcelain slurry is completed; performing stacking after the film is peeled off, and forming a bubble discharge channel in the lamination process; performing uniform pressing on the film after the above operation is completed; and cutting each group of films to obtain the finished product; the method changes the morphology structure of the cast film by adjusting the ingredient process parameters and the formula, and forms the bubble discharge channel in the lamination process. Thus, the occurrence of the lamination bubble is inhibited, and in the packaging and uniform pressing process, the residual micro-bubbles can be effectively discharged from the bar block before the bar block is softened and pressed again, so that the layers of the bar block are fully pressed together, and the bar block delamination or cutting delamination caused by the local gas aggregation and residual is avoided.

The invention relates to the technical field of plastic processing, in particular to a pretreatment device for rheological master batches for a multi-layer co-extrusion PE cast film, and provides the pretreatment device for the rheological master batches for the multi-layer co-extrusion PE cast film, which comprises a mounting frame, a dispersing box is arranged at the top of the mounting frame, and a plurality of flow guide plates are arranged on the dispersing box; the middle and two sides of the bottom of the dispersing box are respectively provided with a material collecting hopper for discharging materials; and the crushing assembly for uniformly crushing the plastic particles is arranged at the top of the dispersing box. Plastic particles smashed by the smashing assembly are screened through the screen plate, meanwhile, the reciprocating assembly drives the pushing mechanism to push the particles in an oriented mode, the particles with the particle size exceeding the standard are pushed to discharging openings in the two sides of the screen plate and enter material collecting hoppers on the two sides of the dispersing box, and therefore the overlarge particles are accurately removed and prevented from entering the subsequent hot melting procedure; the hot melting speed reduction caused by long heating time is avoided, the energy consumption of the hot melting device is finally reduced, the hot melting process is optimized, and the overall effect and the product quality are improved.

This invention discloses an anaerobic biodegradable masterbatch for cast film of sanitary materials, characterized in that its main components, by mass percentage, include: 0.5-3% cypermethrin, 3-6% copper sulfate, 0.1-0.5% metal inorganic salt coating agent, 1-4% ammonium molybdate, 5-10% PLA, 5-10% nano starch, 1-5% carbamide, 7-12% fumed silica, and the balance being a biodegradable resin carrier. The preparation method includes dispersion treatment, centering treatment, structuring treatment, carrier implantation, and plasticizing granulation. The invention also discloses an anaerobic biodegradable cast film for sanitary materials, comprising the following components by mass percentage: 83.4%-97.13% PE-based cast film substrate for sanitary materials, 1-5% PE wax, 1-7.5% degradation masterbatch, 0.15-0.3% dispersant, 0.02-0.2% antioxidant, 0.2-0.6% white oil, 0.5-3% PE grafted maleic anhydride, and 0.2-2% stabilizer. The manufacturing method includes: material preparation, calcium carbonate pretreatment, melting, filtration, and casting. This invention achieves complete anaerobic biodegradation of PE cast leak-proof and breathable films, and also has antibacterial properties during normal use, making it suitable as a breathable film and base film for disposable sanitary materials.

The utility model discloses an air knife structure for a cast film machine and the cast film machine, and relates to the technical field of air knife structures, the air knife structure comprises an air inlet cylinder, the air inlet cylinder is provided with an air inlet and an air outlet; two fixing plates are hinged to the air inlet cylinder, the bottom ends of the two fixing plates are connected with a fan-shaped air knife through detachable connecting pieces, a plurality of air outlet holes are formed in the fan-shaped air knife, the fan-shaped air knife is connected with an air flow divider, and a plurality of air holes are formed in the air flow divider; the two ends of the two fixing plates are both connected with wind shielding cloth. The air knife is arranged to be of the fan-shaped structure, the air flow covering area is increased, the cast film cooling and shaping time is shortened, the cast film production efficiency is improved, meanwhile, the fan-shaped air knife is connected to the two fixing plates through the detachable connecting pieces, and the fan-shaped air knife can be replaced according to actual needs.

The invention provides a high-transparency and high-flame-retardancy antistatic TPU (thermoplastic polyurethane) film and a preparation method thereof. The TPU composite material comprises the following components in parts by weight: 100 parts of TPU master batch, 1-2.5 parts of an antistatic agent, 20-25 parts of a flame retardant, 2-3 parts of an antioxidant and 0.5-1.5 parts of a dispersing agent. The invention further relates to a preparation method of the antistatic TPU film, the antistatic master batch and the flame-retardant master batch are manufactured through polymer modification, then a single-screw extruder is adopted to extrude a cast film according to the polymer blending principle, and compared with a traditional hot melting mode, the method is more convenient, continuous production can be guaranteed, and production loss is reduced; the resistivity of the antistatic TPU film prepared by the method disclosed by the invention can be stabilized by 7 power for a long time, and the resistivity is greatly improved compared with that of a traditional antistatic TPU film.

The invention belongs to the technical field of composite strips, and particularly relates to a high-metallic-luster single ethylene composite strip as well as a preparation method and application thereof. The film comprises a first casting PE film layer, an aluminized BOPE film layer, a film blowing PE film layer and a second casting PE film layer which are connected in sequence, the first casting PE film layer is formed by sequentially connecting a first outer layer, a first middle layer and a first inner layer; and the aluminized BOPE film layer is formed by connecting a second outer layer, a second middle layer and a second inner layer in sequence. The prepared composite strip has a good high-metal-luster effect, is suitable for manufacturing pipe packages such as daily chemical hoses, and is beneficial to environmental protection due to the adoption of a single recyclable material.

The invention discloses a self-adaptive thickness adjusting cast film machine and an adjusting method, and relates to the technical field of cast film machines.The self-adaptive thickness adjusting cast film machine comprises a machining table, a support is fixedly installed at the top of the machining table, a crushing box and a melting box are fixedly installed on the support, the crushing box communicates with the melting box, and a feeding hopper fixedly communicates with the top of the crushing box; the cast film machine further comprises a discharging pipe, the top end of the discharging pipe is fixedly communicated with the bottom of the melting box, and a film blowing assembly is installed at the top of the discharging pipe. The left end of the processing box fixedly communicates with the bottom end of the discharging pipe, two fixing rods are fixedly installed at the bottom of the processing box, the bottom ends of the two fixing rods are both fixedly installed at the top of the processing table, and a supporting plate is fixedly installed at the right end of the processing box; according to the casting film machine, controllable adjustment of the thickness and the width during casting film forming is achieved through a simple structure, the applicability of the casting film machine is improved, operation is convenient, time and labor are saved, and practicability is high.

The application discloses a high-speed adhesive film flow forming machine, which comprises an extrusion die, a cooling roller one, a cooling roller two, a cooling roller three, a conveying belt support fixedly arranged with the roller support, and a tensioning roller one and a tensioning roller two rotatably supported on the conveying belt support; a conveying belt deviation rectifying device is also installed on the conveying belt support; an adhesive film conveying belt is wound around the tensioning roller one, the tensioning roller two, the cooling roller three, the cooling roller two, the cooling roller one and the conveying belt deviation rectifying device; an adhesive film temperature control device is installed on the conveying belt support, and the adhesive film conveying belt passes through the adhesive film temperature control device; the adhesive film temperature control device comprises a temperature control box body installed on the conveying belt support, two air uniformizing hole plates are fixedly installed in the temperature control box body, and the adhesive film conveying belt passes through the middle of the two air uniformizing hole plates which are parallel and spaced apart. The high-speed flow forming machine can effectively improve the production efficiency of the flow forming film and ensure the stability of the flow forming film production quality.

The utility model relates to the technical field of packaging, in particular to a sealing gasket which comprises a sealing assembly, the sealing assembly is used for sealing a bottle body, and the sealing assembly sequentially comprises a hot melt adhesive cast film layer, a first barrier layer, an aluminum foil layer and a printing paperboard layer which are fixedly connected in the direction away from the bottle body; the aluminum foil layer is used for receiving electromagnetic waves to generate heat, heat is sequentially transmitted to the first blocking layer and the hot melt adhesive cast film layer, and the hot melt adhesive cast film layer is used for being fixedly bonded with a bottle body. According to the bottle cap sealing device, the sealing gasket is arranged between the bottle body and the bottle cap by a worker, and the bottle cap is screwed, so that the sealing gasket tightly abuts against the bottle body; then, under the action of an electromagnetic field, the aluminum foil is heated, heat is sequentially transmitted to the first barrier layer and the hot melt adhesive cast film layer, and the hot melt adhesive cast film layer is bonded and fixed to the bottle body after being heated and melted; therefore, the sealing gasket and the bottle body are bonded and fixed by a worker, and the working efficiency is improved.

1. Name of the design product: multilayer co-extrusion cast film production line. 2. Use of the design product: production line for producing films. 3. Design points of the design product: in shape. 4. Picture or photograph best indicating the design points: perspective view 1.

The invention discloses a cast film dynamic deviation rectification control method and system, and relates to the technical field of cast film production, and the method comprises the following steps: collecting a working state signal of external process equipment influencing a deviation rectification system; judging whether the working state of the external process equipment is changed or not based on the working state signal; if it is judged that the working state is a non-starting state, the deviation correction executing mechanism is set to be in a first control mode; if it is judged that the working state is changed into the starting state, the deviation rectifying executing mechanism is switched to a second control mode from a first control mode; and if it is judged that the working state is changed into a complete state, the deviation rectifying executing mechanism is switched to the first control mode from the second control mode. According to the embodiment of the invention, when the working state of the external process equipment is changed, the production quality and efficiency of the cast film are remarkably improved.

The utility model discloses a cast film machine spare polishing device with dust removal function relates to cast film machine polishing tool technical field, including the shell, the shell one side installs the limit table, and the limit table lower extreme is equipped with the limit slot, and the limit table is installed in the polishing belt, and two equidistance metal's flexible table are installed to the limit table bottom, and the polishing belt front end and rear end are installed respectively with the detachable electrostatic belt, and the shell lower end one side is installed with the dust collecting box, and the dust collecting box one side is installed with the extension table, and the dust collecting box opposite side is installed with the dust absorption pipe, and the extension table penetrates the limit slot, and the extension table lower extreme is connected with the flexible table, in the utility model, through the cooperation between the polishing belt and the electrostatic belt, solved the problem that the waste dust scatters and pollutes the working environment, improved the cleanliness of working environment, through the cooperation between the dust collecting box, the dust absorption pipe and the extension table, solved the problem that a large amount of waste dust accumulation influences polishing effect, improved the dust removal efficiency of polishing device.

The utility model provides a cast film machine with tension adjusting device, including cast film machine body still includes tension adjusting subassembly, guide component, cleaning subassembly and static elimination subassembly, the utility model discloses the synergic working between tension adjusting subassembly, when conveying to the film, the rotary motor can drive the adjusting roller to move up and down, the tension of film is adjusted, prevents film from being too tight and leading to film deformation damage, has guaranteed the quality of film, through the synergic working between cleaning subassembly, when film transports respectively to guide roller no.

The utility model provides a cooling water circulating device for a flat filament drawing process, and belongs to the field of manufacturing of cooling equipment. The device comprises a cast film cooling water tank, a centrifugal pump, a purification tank, a storage tank, a mixing tank and a circulating pump, a circulating pipeline is arranged on the cast film cooling water tank, and the two ends of the circulating pipeline are located on the two sides of the cast film cooling water tank respectively; the centrifugal pump, the purification tank, the storage tank, the mixing tank and the circulating pump are sequentially mounted on the circulating pipeline. The device is very good in practicability, reasonable in structural arrangement and convenient to operate, cooling water is recycled for multiple times, waste of water resources is greatly reduced, the machining cost is reduced, and the effect is obvious.

The invention relates to the technical field of film casting, in particular to casting cooling equipment, which comprises a bracket on which a control box is mounted, and further comprises a first cooling roller which is arranged on the bracket and is provided with a transmission component corresponding to the end part of the first cooling roller, and a second cooling roller which is arranged on the bracket and is provided with a transmission component corresponding to the end part of the first cooling roller, the second cooling roller is arranged at the position, corresponding to one side of the first cooling roller, of the support, and an adjusting roller is elastically arranged at the position, corresponding to the position between the first cooling roller and the second cooling roller, of the support; the filtering assembly is communicated with the adjusting roller; the casting film is wound on the adjusting roller from the first cooling roller and then wound on the second cooling roller from the adjusting roller to be cooled, and in the cooling process, the casting film between the first cooling roller and the second cooling roller is in a tight state through cooperation of the adjusting roller, the first reset spring and the mounting frame, so that the thickness uniformity of the casting film is guaranteed, and the service life of the casting film is prolonged. And transverse wrinkles and edge warping are avoided.

This utility model discloses a twin-screw extruder for a casting film machine with a heat-separating structure. It includes a barrel, inside which two sets of feeding screws are installed. A drive mechanism for rotating the feeding screws is located on the outside of the barrel. Several sets of heating plates are installed on the outside of the barrel, and these heating plates are separated by heat-insulating partitions. A heat-insulating shell is installed on the outside of the barrel, with the heating plates located inside the heat-insulating shell. The heat-insulating partition includes a partition body, and a ceramic heat-insulating layer is fixedly connected to the outside of the partition body. Several sets of heat-insulating connecting strips are provided on the outside of the ceramic heat-insulating layer, with the other end of each connecting strip connected to a fiberglass board. This twin-screw extruder for a casting film machine with a heat-separating structure addresses the problem of existing twin-screw extruders being inconvenient for zoned temperature control of different areas by installing two sets of feeding screws inside the barrel.

The utility model discloses a casting membrane shell transfer device capable of quickly replacing long and short forks. The casting membrane shell transfer device comprises a transfer mechanical arm, a pick-and-place frame, a long fork rod and a short fork rod, the taking and placing frame is arranged on one side of the transferring mechanical arm and provided with a first placing frame and a second placing frame, and the first placing frame and the second placing frame are used for placing the long fork rod and the short fork rod correspondingly. The long fork rod or the short fork rod is connected with the tail end of the transfer mechanical arm through a quick insertion assembly, and a fork head is arranged at the other end of the long fork rod and used for being inserted into a bottom groove of a module. According to the utility model, the technical problem that the posture of the mechanical arm is difficult to cover all loading and unloading sites is solved, the smooth transfer of the membrane shell between different stations is ensured, the cost is reduced, and the occupied space is reduced.

The invention discloses a cast film preparation method based on a controllable transparency adjusting technology and application thereof, and relates to the technical field of cast films.The cast film preparation method comprises the following steps that S1, raw materials including, by mass, 80-100 parts of polyethylene resin, 0.24-0.5 part of a transparent agent, 0.24-0.5 part of a composite antioxidant and 1-2 parts of an ultraviolet light absorber are prepared; s2, the raw materials are added into a stirrer to be mixed, a mixed material is obtained, then the mixed material is put into a double-screw extruder to be extruded and granulated, and granules are obtained; s3, casting the obtained granules into a film, and quickly cooling after molding to obtain a cast film based on the controllable transparency adjusting technology; the mass ratio of the polyethylene resin to the transparent agent is 1: (0.003-0.005); the cast film provided by the invention has relatively high transparency and yellowing resistance, and the transparency of the cast film can be controlled by controlling the mass ratio of the polyethylene resin to the transparent agent.

The invention relates to a cast film consisting of a polypropylene composition comprising a) at least 90 wt.-% (based on the overall weight of the polyolefin composition) of at least one first polypropylene homopolymer (PPH-1) having a molecular weight distribution index Mw / Mn measured by GPC (according to ISO 16014-4:2003 and ASTM D 6474-99) in the range of 2.0 to 5.0, a MFR2 (ISO1133, 2.16 kg load at 230 °C) between 1.0 and 15 g / 10 min, a sum of 2,1- insertion in the range of 0.3 to 1.5 mol% (determined by 13C nuclear magnetic resonance (NMR) spectroscopy), b) 0.1 – 10 wt.-% (based on the overall weight of the polyolefin composition) of at least one second polypropylene (PPH-2) having a MFR2 (ISO1133, 2.16 kg load at 230 °C) between 0.5 and 20 g / 10 min, a melting point determined by differential scanning calorimetry (DSC, ISO ISO 11357 / part 3 / method C2) of at least 160 °C and a crystallization point (DSC) of at least 120°C, c) optionally at least one additive, wherein the sum of all ingredients always adds up to 100 wt.-%. The invention relates also to the use of said cast film in pharmaceutical packaging systems.

The application relates to the technical field of casting machine structures, in particular to a high-low-temperature TPU in-mold composite casting machine, which has the structure comprising a casting mechanism, a cooling and forming mechanism and a winding mechanism, wherein the casting mechanism comprises a casting film head fixed below a rack, and further comprises a cleaning mechanism rotatably connected to the rack and used for removing accumulated materials from the mold lip of the casting film head; the cleaning mechanism comprises a fixed base and a sliding assembly, the fixed base is internally provided with a driving device for driving the sliding assembly to slide along the length direction of the casting film head, the top end of the sliding assembly is provided with a scraper capable of being inserted into the gap between the mold lip and the casting film head, and the sliding assembly is further provided with a material discharging mechanism for discharging the accumulated materials in front of the reciprocating scraper; the glue removing hook of the application sequentially experiences the actions of lifting, peeling and separating under the driving of the transmission assembly, so that the accumulated materials in front of the scraper can be effectively removed, the problems of increased scraping resistance and incomplete scraping caused by the accumulated materials are avoided, and the efficiency and cleanliness of the mold lip cleaning are improved.

The utility model relates to the technical field of cast film machines, discloses an extrusion mechanism for a cast film machine, and solves the problems that granular materials which are not completely molten possibly enter a mold along with the extrusion mechanism, so that bulges are generated on the surface of a generated cast film, and the product quality is reduced. A separation assembly comprises a fixing frame, a sliding block is installed in the fixing frame in a sliding mode, a threaded rod penetrates through the middle of the sliding block in a threaded mode, a motor is installed on one side of the fixing frame, a separation plate is installed on a guide pipe in a sliding mode, two secondary filter screens are arranged on the separation plate, and materials are pushed into the guide pipe; incompletely-molten large-particle materials are blocked by the secondary filter screens, the motor is started to drive the threaded rod to rotate and drive the sliding block to slide to enable the separation plate to move until the other secondary filter screen is located on one side of the output end of the extrusion bin, the secondary filter screens are replaced without shutdown, and the filtering effect of the secondary filter screens on the incompletely-molten materials is improved.

The application relates to the field of packaging materials, in particular to a low-temperature heat-sealable CPP casting film and a preparation method thereof. The low-temperature heat-sealable CPP casting film comprises a corona layer, a barrier core layer and a heat-seal layer. The raw materials of the corona layer comprise random copolymerized polypropylene resin, antistatic agent, opening agent and functional enhancer. The raw materials of the barrier core layer comprise block copolymerized polypropylene, auxiliary resin, nucleating agent and lubricant. The raw materials of the heat-seal layer comprise ternary copolymerized polypropylene, opening agent and anti-blocking agent. The application provides the low-temperature heat-sealable CPP casting film which can simultaneously maintain excellent comprehensive properties such as mechanics and optics, thereby meeting the higher requirements of modern high-speed automatic packaging and diversified contents on packaging materials.