80 results about "Parafilm" patented technology

The utility model provides a steam-proof sealing mould on a wide-mouth bottle sealing machine, which relates to the technical field of sealing machine moulds and comprises a bottom plate, a bearing plate is arranged above the bottom plate, a placing groove is arranged on the bearing plate, a lower mould is fixedly connected to the bottom of the placing groove, and a mounting plate is arranged on the bearing plate. According to the sealing mold, the sealing film is pressed downwards through the film pressing assembly during sealing, so that the sealing film is sunken towards the interior of a bottle opening, a space for bulging of the sealing film is reserved, the welding position of the sealing film and the bottle opening is cooled, meanwhile, the sealing film is pressed to be attached to the bottle opening, and the situation that sealing is not tight due to steam leakage is avoided; the bottle is ejected out of the lower die through the material returning assembly after the bottle is sealed, so that an operator can take out the bottle conveniently, and the machining efficiency is improved.

The utility model relates to the technical field of cutting devices, in particular to an automatic cutting machine for a sealing film. Comprising a mounting box, an unwinding roller, an upper pressing roller, a lower pressing roller, a cutter and two transmission assemblies. A through hole is formed in the mounting box; the unwinding roller is rotationally mounted on the inner side of the mounting box; the upper pressing roller is rotationally mounted on the inner side of the mounting box, the lower pressing roller is located below the upper pressing roller, a rotating frame is arranged on the inner side of the mounting box, the lower pressing roller is rotationally mounted on the rotating frame, and an elastic assembly is connected between the rotating frame and the bottom end of the inner wall of the mounting box; the cutter is located on the inner side of the mounting box, and the cutting base is arranged below the cutter. The two transmission assemblies are installed at the two ends of the inner side of the installation box correspondingly. Each transmission assembly comprises a rotary disc, a movable piece, a movable shaft, a gear ring and a gear. According to the technical scheme, when the sealing film is pulled to move, automatic cutting work of a film body can be achieved, the cutting lengths are the same every time, the practicability of the sealing film cutting device is improved, and waste of the film body is avoided.

The utility model discloses a sauce material sealing machine which comprises a platform, a main body frame, a rotating shaft adjusting mechanism, a mounting clamping mechanism and an adjusting auxiliary mechanism, and the rotating shaft adjusting mechanism comprises a driving shaft assembly, a sealing film shaft, an adjusting shaft, a clamping pipe, a clamping rod, a lateral plate and an adjusting plate. The installation clamping mechanism comprises a clamping groove, an extending spring rod, a rotating ring, a pushing block, a locking block, a directional ring and a locking frame, the position and the tensioning degree of a sealing film can be accurately adjusted through cooperation of a driving shaft assembly, a sealing film shaft, an adjusting shaft and other components, and therefore it is guaranteed that the sealing effect is uniform and stable, and the clamping rod and a clamping pipe are matched to achieve the effect of sealing. Clamping and fixing can be rapidly achieved, the operation time is shortened, the working efficiency is improved, through the matched design of the orientation ring, the lock frame and the lock block, the clamping ring and the clamping rod can be stably fixed to the proper position, loosening caused by vibration or external force in the working process is avoided, and the accuracy of sealing work is ensured.

The utility model discloses a sealing device for recombined collagen dressing, which belongs to the technical field of dressing packaging and comprises a support frame, a hot pressing component, two unwinding rollers, two guide components, a first sealing film, a second sealing film and a limit component. Hot pressing plates are connected to the surfaces, close to each other, of the two air cylinders; the two unwinding rollers are rotationally connected into the supporting frame. According to the sealing device, in the process that the guide roller guides the first sealing film and the second sealing film, the two sets of limiting plates can limit the first sealing film and the second sealing film respectively, so that the first sealing film and the second sealing film cannot deviate in the moving process; according to the dressing hot-sealing device, the two hot-pressing plates close to each other can conduct hot sealing on dressing located between the first sealing film and the second sealing film with high quality, and due to the fact that the distance between the two limiting plates in the same guide roller is adjustable, the applicability of the dressing hot-sealing device is improved.

The present invention discloses an automatic film-sealing device for the mouth of a plastic bottle and its working principle. The device includes a machine and a control circuit. The machine is provided with a turntable, and four groups of heat-sealing heads are evenly distributed around its rotation center on the turntable. The heat-sealing heads are electrically connected to the control circuit. The machine is provided with a film-cutting mechanism for cutting out a sealing film from an aluminum-plastic composite film, a film-loading mechanism for moving the sealing film to the heat-sealing head, a bottle-releasing mechanism for inserting the plastic bottle into the heat-sealing head with the sealing film, a bottle-pressing mechanism for applying pressure to the plastic bottle on the heat-sealing head, and a bottle-removing mechanism for removing the plastic bottle from the heat-sealing head. The turntable drives the heat-sealing head to the film-loading mechanism, the bottle-releasing mechanism, the bottle-pressing mechanism, and the bottle-removing mechanism in sequence for processing. This device can automatically complete the automatic film sealing of the mouth of the plastic bottle, has high production efficiency, good sealing effect, safety and reliability, can improve sealing quality while saving labor costs, and can replace manual film-sealing processes.

The invention provides a boiling-resistant traceless sealing film for an aluminum foil box and a preparation method of the boiling-resistant traceless sealing film, and relates to the field of packaging. Comprising a PET layer, an aluminum foil layer, a BOPA enhancement layer and a heat sealing layer, wherein the BOPA enhancement layer comprises BOPA resin, organic modified montmorillonite, quaternary ammonium salt nano cellulose, a composite antioxidant, a lubricant and a compatilizer; the heat sealing layer comprises metallocene polyethylene, ethylene-vinyl acetate, maleic anhydride grafted polyethylene, a lubricant, thiolated nano zinc oxide, chitosan, organic modified montmorillonite and antibacterial modified silicon dioxide; the aluminum foil layer is made of chitosan-cellulose modified aluminum foil. The sealing film has the advantages of being high in strength, easy to tear off and good in antibacterial property.

The invention discloses a crawler-type automatic hole filling device for mine blast holes, and belongs to the technical field of mine blasting, the crawler-type automatic hole filling device comprises a crawler-type chassis, a water conveying assembly, a film releasing assembly, an end heat sealing assembly, a side heat sealing assembly, a film clamping and conveying assembly, a former and a case, the side face heat sealing assembly can seal the side face of a film, the film clamping and conveying assembly clamps and conveys the film, and the end heat sealing assembly seals the end of the film. The control system cooperates with the water conveying assembly, the film releasing assembly, the end heat sealing assembly, the side face heat sealing assembly and the film clamping and conveying assembly to work, a series of process automatic operations such as water injection, sealing and hole filling are completed, the single hole filling time is greatly shortened, the efficiency is greatly improved compared with manual work, the manual labor intensity is reduced, and the production efficiency is improved. And the number of hole filling operators is reduced.

The utility model discloses a film sealing device, which relates to the technical field of laboratory detection and comprises a film sealing device main body, a fixing strip is fixedly connected to the front side of the outer surface of the film sealing device main body, a silica gel strip is fixedly connected to the front side surface of the fixing strip, and sealing fine teeth are fixedly connected to the outer surface of the film sealing device main body and correspond to the fixing strip. An extending opening is formed in the tail end of the left side of the film sealing device body in a penetrating mode, a movable block is slidably connected to the interior of the film sealing device body, an elastic piece is fixedly connected to one side of the movable block, an inclined film prying part is arranged at the tail end of the elastic piece, and an extrusion spring is fixedly connected to the side, away from the elastic piece, of the movable block. A clamping groove is formed in the side, close to the sleeve, of the movable block. The PCR plate sealing device has the advantages that the sealing film and the PCR plate are ensured to be tightly attached by using the film sealing device, and a PCR product is effectively prevented from being volatilized in an experiment process by the tight attachment, so that the accuracy and the reliability of an experiment result are ensured.

The tissue box sealing film comprises a film body, an expansion opening and a tissue taking hole are formed in the film body, the expansion opening is communicated with the tissue taking hole, a tearing piece is arranged in the tissue taking hole, the tearing piece is connected to the film body in a breakpoint mode, and the expansion opening is combined with the tissue taking hole. The sealing film is expanded when paper is taken, meanwhile, the paper taking hole facilitates twisting and taking of the paper, the specially-arranged paper taking hole enables paper towels to be extracted more easily, meanwhile, the tearing trouble is reduced, the paper taking efficiency and convenience are improved, due to the arrangement of the tearing piece, a user can open the paper taking hole through the simple tearing action, and the paper taking efficiency and convenience are improved. Due to the breakpoint connection design of the tearing piece, the situation that the film is torn difficultly or torn incompletely is avoided when the film is torn, and therefore the convenience of a user is improved.

An ingredient blending device comprises a rack, a supporting frame for supporting a crucible with an upward opening is arranged on the rack, and a sealing film is arranged at the position, above the supporting position of the crucible, of the rack. The crucible moves upwards along with the supporting frame to the position of the sealing film with the film face located at the horizontal position, and when the film blocks the opening of the crucible in a sealed mode, the driving shaft drives the machine frame to rotate in the plumb plane. When the machine frame stops rotating and resets to the locking position where the opening of the crucible faces upwards, the cutting unit cuts out a film cutting piece blocking the opening area of the crucible on the sealing film, and the film smashing unit abuts against and pushes the film cutting piece to move towards the interior of the crucible. The sealing film is used for sealing the opening of the crucible, the cutting unit can cut off the film body blocking the area of the opening of the crucible, and the film body is pushed into the crucible by the film smashing unit and is fused together with materials, so that the loss of original materials in the crucible is avoided, and the fused film body does not influence the subsequent detection result.

The invention provides a universal easy-to-uncover sealing film which comprises a printing layer, a barrier layer, a bonding layer and a heat sealing layer, the printing layer and the heat sealing layer are bonded on the barrier layer through the bonding layer, and the heat sealing layer comprises the following components in parts by mass: 40-60 parts of POE, 20-40 parts of EVA, 10-30 parts of ionomer resin, 10-30 parts of a nano composite additive and 0.6-3 parts of a modified additive. The invention further provides a preparation method of the universal sealing film easy to uncover. Compared with the prior art, the problem that an existing sealing film is not easy to uncover can be solved.

The utility model relates to a fish can convenient to uncover, which belongs to the technical field of cans and comprises a can body with an upward opening and an accommodating cavity formed inside, a sealing film for sealing is hermetically connected to the opening of the can body, and the top of the can body is in threaded connection with a can cover with a downward opening in the vertical direction. The can cover extends outwards in the vertical direction to form a thickened area, an operation inserting groove is formed in the thickened area, a film scratching assembly used for scratching the sealing film is arranged in the operation inserting groove, first anti-skid lines are arranged on the outer side wall of the can cover in a circumferential array mode, and internal threads are formed in one end of the operation inserting groove. An operator can directly rotate by hands, the surface of the can cover is provided with first anti-skid lines, and if the can cover is difficult to open by hands, an external rod body can be inserted into the operation slot, the operation slot is used as a fulcrum to drive the can cover to rotate, and acting force is applied by utilizing the lever principle, so that the can cover can be unscrewed in a labor-saving manner.

The application discloses a method for reducing vitrification of anther culture regenerated plants, and belongs to the technical field of plant tissue culture. The method comprises the following steps: inoculating anthers into a culture bottle containing a culture medium, covering a layer of breathable sealing film on the bottle mouth of the culture bottle, and tightening the breathable sealing film with an elastic band; then covering a layer of non-breathable sealing film on the outer layer of the breathable sealing film, and tightening the non-breathable sealing film with a rubber band; when embryoid is induced to be generated in 20-25 days, the covered non-breathable sealing film is removed, and only the breathable sealing film is left. The application has the following advantages: when the anthers are subjected to high-temperature treatment, the humidity in the culture bottle is not too low due to the covering of the non-breathable sealing film, and the survival of immature pollen is not affected; when embryoid is induced to be generated in 20-25 days, the non-breathable sealing film is removed, and only the breathable sealing film is left, so that the embryoid will not be vitrified due to excessive humidity; and the suitable humidity in the culture bottle can be realized only by covering or not covering the non-breathable sealing film, so that the workload of large-scale production of haploid plants is reduced.

The utility model discloses a film feeding device for a vermicelli sealing machine, which relates to the technical field of sealing machines, is applied to a sealing machine body, and comprises an unwinding roller rotationally arranged on the side wall of the sealing machine body, a sliding block arranged in the side wall of the sealing machine body, a screw rod arranged in the sliding block, and a second motor arranged at the end part of the screw rod, a semi-arc plate is arranged at the outer side end of the sliding block, a sleeve sleeves the outer side of the semi-arc plate, a plurality of uniformly distributed air outlet holes are formed in the outer side of the sleeve, an exhaust fan is arranged at the air inlet end of the semi-arc plate, a sealing film is wound on the unwinding roller, and the free end of the sealing film bypasses the upper end of the sleeve and extends downwards; the sealing surface of the sealing film is dedusted, so that the sealing quality of the vermicelli packaging box is improved.

The invention provides a paraffin sealing film as well as a preparation method and application thereof, and belongs to the field of polymer modification. The invention provides a paraffin sealing film, which is prepared from the following raw materials in parts by mass: 10 to 85 parts of polyolefin elastomer; 8 to 65 parts of liquid rubber; 8-55 parts of a plasticizer; and 0-10 parts of an auxiliary agent. According to the invention, the elastic polyolefin elastomer is used as a main component, the liquid rubber is added to adjust the processability, the flexibility, the sealing property, the adhesive property and the like of the film, and the plasticizer is added to adjust the toughness, the lubricating property, the adhesion property and the like of the film; the main components and double bonds contained in the liquid rubber can be crosslinked at high temperature under electron beam irradiation, and the obtained film material is further controlled to have higher crosslinking degree, so that the film material has higher strength, flexibility, oil resistance and chemical reagent resistance.

The application provides a paper-plastic sealing film and a preparation method and application thereof, and relates to the technical field of sealing films.The preparation method of the paper-plastic sealing film comprises the following steps: S1, a single-component polyurethane adhesive is coated on one side of a paper base layer to form a first adhesive layer, a printing layer is first combined with the first adhesive layer, winding is performed, and first aging is performed; S2, a single-component polyurethane adhesive is coated on the other side of the paper base layer to form a second adhesive layer, a polyester film layer is secondly combined with the second adhesive layer, winding is performed, and second aging is performed; and S3, a two-component polyurethane adhesive is coated on the side of the polyester film layer which is not combined to form a third adhesive layer, a polyolefin film is thirdly combined with the third adhesive layer, winding is performed, and third aging is performed.The paper-plastic sealing film prepared by the method has the advantages of improved flatness, excellent composite strength, no delamination, and no bubbles after heat sealing.

The utility model discloses a novel easy-to-uncover film instrument packaging bag which comprises an upper film and a lower film, and the upper film and the lower film define a bag body with one end open. The upper film comprises a first upper film, a second upper film and a sealing film, an opening is formed between the adjacent end edges of the first upper film and the second upper film, the sealing film is arranged under the opening, and the sealing film is connected to the bottoms of the first upper film and the second upper film. The non-gluing Tyvek top bag is made of a conventional breathable material, has the advantages of being easy to uncover, good in breathability, high in strength, high in bacterium blocking performance and relatively obvious in cost advantage, a novel packaging bag is formed by the non-gluing Tyvek top bag and a thin film, gas sterilization can be achieved, the puncture resistance and the impact strength are higher, and the cost is lower compared with a traditional gluing Tyvek top bag.

The utility model provides an automatic sealing machine for bacterial cellulose shallow tray culture, which relates to the field of automatic sealing machines and comprises a machine tool, a conveying table top is arranged on the machine tool, vertical plates are arranged at two ends of the machine tool, a top beam is arranged between the two vertical plates, a sealing film pressing component is mounted and connected in the middle of the top beam, and a sealing film is arranged on the sealing film pressing component. And the vertical plate at one end is connected with an operation screen. The tension of the film is automatically adjusted through relative displacement of the rollers, and the sealing film can be always kept in a flat and accurately aligned state by combining the synergistic effect of the guide rollers, so that the laying accuracy of the sealing film is greatly improved, and the sealing failure caused by the problems of wrinkling, deviation and the like of the film is effectively avoided; the tray culture containers are pushed to move through the two positioning plates, the tray culture containers of different specifications can be accurately positioned to ideal positions below the film sealing and pressing assembly, and it is ensured that sealing operation can be conducted at standard positions and states every time.

The application discloses a silage preparation device, and belongs to the field of feed processing. The device comprises a discharge pipe, a temporary storage part with an open lower end arranged on one side of the discharge pipe, a limiting plate movably arranged on the lower end edge of the temporary storage part, a sealing drive mechanism arranged on the temporary storage part and used for pushing a sealing cover, a roller arranged on one side of the temporary storage part, a clamping mechanism used for dragging a sealing film on the roller to pass below the temporary storage part, a knife holder used for moving along the width direction of the sealing film after the sealing is completed, and a cutting knife arranged on the knife holder and used for cutting the sealing film, a transfer mechanism arranged on the discharge side of the discharge pipe and used for moving between the discharge pipe and the temporary storage part. The silage preparation device can seal the bag opening after the silage is filled into a bag.

The utility model provides a sample sampling and detecting device, which relates to the technical field of sample sampling, detecting and analyzing, and is characterized in that a separating cylinder is arranged in a bottle body component, and a test solution and test paper in the bottle body component are separated by using the separating cylinder and a sealing film at the bottom opening of the separating cylinder, so that dry-wet separation is realized, and liquid leakage and seepage are avoided; after the bottle cap component is screwed on the bottle opening of the bottle body component and is separated from the threads, a user drives the bottle cap component to downwards press and move relative to the bottle opening of the bottle body component, so that the sampling component connected with the bottle cap component is driven to pierce the sealing film, and the test solution in the cavity enters the liquid storage cavity to be in full contact with the test paper; the whole device is simple in structure and convenient to operate, the sample can be diluted and detected immediately after being collected, and the sample is not prone to pollution and decomposition.

The utility model provides a seasoning bottle sealing structure, which belongs to the technical field of sealing films and comprises a bottle body, a sealing film and a bottle cap, the sealing film is fixedly arranged at a bottle opening of the bottle body, the bottle cap is in close fit with the bottle opening, the sealing film comprises a bottom layer and a surface layer, the bottom layer is fixedly connected to the bottle opening, a plurality of discharging holes are formed in the bottom layer in a penetrating manner and form a discharging area, and the surface layer is arranged on the bottom layer. The surface layer is adhered to the upper portion of the bottom layer, the connecting strength of the surface layer and the discharging area is weaker than that of the surface layer and areas outside the discharging area, the surface layer is provided with a tearing line corresponding to the edge of the discharging area, a gasket matched with the sealing film is arranged in the bottle cap, the discharging area and the discharging holes are formed in the bottom layer of the sealing film, and the surface layer is adhered to the bottom layer, so that moisture prevention is facilitated during seasoning storage. When the seasoning bottle is used, seasoning can be poured out from the discharging hole only by unscrewing the bottle cap and tearing off the surface layer, the bottle cap is tightened after the seasoning bottle is used, and the discharging hole is sealed by the gasket, so that the seasoning is prevented from being affected with damp.

A packaging cup sealing film device comprises a rack, a film transmission device, a film tension adjusting device, a packaging cup clamp, and a hot cutting device. The film tension adjusting device maintains the sealing film in a tension state. The film transmission device intermittently transmits the sealing film to above the packaging cup clamp and completes pre-alignment. The roller group installed on the lifting frame drives the sealing film in the tension state of the hot cutting processing area to move to the packaging cup clamp, so that the alignment holes on the sealing film are paired and aligned with the alignment pins on the packaging cup clamp. The hot cutting device synchronously hot cuts the sealing film and the cup body in the assembly hole after pairing and alignment. The film stripping device strips the sealing film and the packaging cup clamp. The device can realize high flatness of the sealing film, alignment accuracy between the pattern and the packaging cup, high pressing tightness between the sealing film and the packaging cup, and regularity of the sealing film edge. Meanwhile, the device has strong universality, can greatly reduce the difficulty of the debugging process, reduce the energy consumption of the device operation, and improve the operation efficiency.

The invention provides a high-temperature-resistant hydrophobic sealing film for a plain foil box and a preparation method of the high-temperature-resistant hydrophobic sealing film, and relates to the field of packaging materials, the high-temperature-resistant hydrophobic sealing film comprises a PET layer, an aluminum foil layer and a heat sealing layer which are sequentially connected through an adhesive; the heat sealing layer comprises metallocene polyethylene, linear low-density polyethylene, an ethylene-vinyl acetate copolymer, maleic anhydride grafted polyethylene, a polyolefin elastomer, maleic anhydride grafted polyethylene wax, a composite antioxidant, an antibacterial agent and a water repellent agent; the hydrophobic agent is nano silicon dioxide with a core-shell structure. The sealing film has excellent high temperature resistance, heat sealability, hydrophobicity and antibacterial property.

A sealing machine (1) comprising two sealing and film cutting stations (2, 3) each equipped with upper and lower tooling, a container conveyor (4) (101) comprising a plurality of receiving compartments (7) for at least one container (101) arranged one after the other to form a line (8) of compartments (7) capable of passing successively through the sealing stations (2, 3) and a discontinuous drive device for said line (8) to allow, in the stopped state of said line (8), sealing by relative movement of the lower and upper tooling, two drive devices (5; 6) for moving a strip of sealing film each dedicated to one sealing station.The drive device (9) for the line (8) of compartments (7) is a double-stepping device (9) configured to, between two sealing operations, in at least one operating mode, move each compartment (7) of the line (8) in the direction of travel by at least two steps. Figure for the abbreviation: Fig. 1.

The invention relates to beverage containers (1), in particular beverage pouches, with a front container wall (1a), a rear container wall (1b) and a bottom (8) made of a single- or multi-layer packaging film (2), comprising: a slit-shaped die-cut (3) provided in the upper region of the front container wall (1a), wherein the packaging film is completely or partially perforated by the die-cut (3) without particles of the packaging film (2) being punched out, a closure film (12) attached to the inside of the packaging film (2) of the front container wall (1a) by gluing, welding or sealing in order to cover the slit-shaped die-cut (3) on the inside, wherein the gluing, welding or sealingSealing between the inner surface of the packaging film and the closure film, a sealed area (4) is formed which encloses the die-cut (3) in the packaging film (2) on the inside, wherein the sealed area (4) between the closure film (12) and the packaging film (2) comprises an inner weld edge (5) and an outer weld edge (6), wherein the inner weld edge (5) encloses an area (7) in which the packaging film (2) is not glued, welded or sealed to the closure film (12) and in which the slit-shaped die-cut (3) is located.

The utility model provides a chest drainage tube fixing pasting film, and relates to the field of medical instruments, the chest drainage tube fixing pasting film comprises a pasting film body, the pasting film body comprises an absorption layer, and the absorption layer can be a super absorbent polymer or hydrogel and can absorb seepage and protect skin around a pipeline; a round hole is formed in the middle of the pasting film body, the drainage tube penetrates through the round hole, a gap is formed in the pasting film body, the gap starts from the outer edge of the outer end of the pasting film body, and the gap ends at the edge of the round hole; two connecting edges are formed at the position, provided with the crack, of the pasting film body, the two connecting edges are connected with sealing films, the sealing films are pasted on the skin of a patient firmly, the pasting film body further comprises a bonding layer and a bottom layer, the absorbing layer, the bonding layer and the bottom layer are sequentially connected, the bonding layer is made of medical pressure-sensitive adhesive, and the bottom layer is made of medical adhesive. According to the chest drainage tube, the problems that gauze dressing around the chest drainage tube is prone to falling off, seepage cannot be absorbed, and repeated dressing change is needed are solved.

The utility model discloses an aluminum foil easy-to-tear cover convenient to completely tear and capable of preventing cut, and aims to solve the technical problems that in the prior art, when a sealing film is torn, the sealing film is easy to break, and the risk that consumers are cut is often hidden by sharp edges formed at the broken position. The aluminum foil easy-to-tear cover comprises an easy-to-tear cover body, a sealing film and a spoon, the sealing film is connected to the surface of the easy-to-tear cover body, the spoon is arranged on the bottom side of the easy-to-tear cover body, a limiting strip is connected to the surface of the easy-to-tear cover body, a rubber block is connected to the surface of the easy-to-tear cover body, a clamping groove is formed in the surface of the rubber block, and a rotating rod penetrates through the clamping groove. According to the easy-to-tear aluminum foil cover, the rotating rod penetrates through the interior of the limiting strip and is inserted into the interior of the connecting block, when the rotating rod rotates, one side of a sealing film can be torn down, the sealing film is rolled up in the rotating process, and in this way, the sealing film can be prevented from being damaged in the tearing-down process; therefore, a user can be prevented from being scratched by the sharp edge of the damaged part of the sealing film.

The invention relates to the technical field of corn packaging equipment, in particular to high-end fresh corn box type modified atmosphere fresh-keeping packaging equipment which comprises a rack. The assembling box is movably connected with the rack, the assembling box comprises an upper box body and a lower box body, and the upper box body and the lower box body abut against each other to form a vacuum chamber; the objective table is provided with a profiling cavity, and the objective table is connected with the lower box body; the sealing pressing block is provided with a heating ring, the sealing pressing block is connected with the upper box body, and the sealing pressing block can move in the vertical direction; the gas control unit is used for extracting or feeding fresh-keeping gas into the vacuum chamber, the gas control unit is connected with the rack, and the gas control unit is connected with the assembly box; the sealing film feeding unit is located in the assembling box, and the sealing film feeding unit is used for enabling the sealing film to continuously pass through the upper portion of the objective table; the method has the effects that the damage to the corn is reduced while the fresh-keeping period of the corn is controlled, so that the product quality is guaranteed.

The invention provides a paper-plastic sealing film as well as a preparation method and application thereof, and relates to the technical field of sealing films. The preparation method of the paper-plastic sealing film comprises the following steps: S1, coating one side of the paper base layer with a single-component polyurethane adhesive to form a first bonding layer, and carrying out primary compounding, rolling and primary curing on the printing layer and the first bonding layer; s2, the other side of the paper base layer is coated with a single-component polyurethane adhesive to form a second bonding layer, and the polyester film layer and the second bonding layer are composited for the second time, rolled and cured for the second time; and S3, coating the non-compounded side of the polyester film layer with the bi-component polyurethane adhesive to form a third bonding layer, compounding the polyolefin film and the third bonding layer for the third time, rolling, and curing for the third time. The flatness of the paper-plastic sealing film is remarkably improved, the composite strength is excellent, layering is avoided, and bubbles are avoided after heat sealing.