61 results about "Transfer efficiency" patented technology

The embodiment of the invention relates to the field of radioactive waste treatment, in particular to a material containing device and curing equipment. The first containing piece and the second containing piece of the material containing device are arranged to be in a detachable and separable form, so that powdery radioactive materials cannot escape from a seam, and meanwhile, after the powdery materials are pressed into solid materials, the first containing piece and the second containing piece can be separated; the solid materials contained in the first containing part can be independently transferred, the material containing device is prevented from being integrally transferred when the solid materials are transferred, and the transferring efficiency of the solid materials is improved. According to the curing equipment, the material containing device is adopted as a material conveying carrier, materials in different stages and states in the curing process can be contained, and leakage of the materials is prevented; meanwhile, in the whole curing process, form transformation of the materials can be achieved without replacing the containing device, the operation process is simplified, material spill caused by replacing the containing device is avoided, and therefore the curing efficiency is improved.

The invention relates to the technical field of printing coatings, and provides a transfer printing coating and a preparation method thereof. The preparation method comprises the following steps: S100, performing esterification reaction on starch under an alkaline condition to obtain esterified starch; carrying out pre-crosslinking treatment on the esterified starch and a first crosslinking agent to obtain modified functional starch; s200, carrying out mechanical pretreatment and chemical functionalization treatment on the cellulose raw material to obtain functionalized nano cellulose hydrogel; and S300, mixing the modified functional starch, the functionalized nanocellulose hydrogel and a second cross-linking agent to obtain the transfer printing coating. After being subjected to pre-crosslinking treatment, the modified functional starch has better stability and shear degradation resistance, and meanwhile, the rheological properties required by gelatinization and coating are reserved; after the nano cellulose is subjected to surface functionalization, the dispersity is improved, the interfacial compatibility is improved, and a mechanical enhancement and blocking network is provided, so that a coating film has high transfer efficiency and good surface smoothness in the transfer printing process.

A method of preparing a coated article is disclosed. The method includes providing a substrate bearing a partially-dehydrated aqueous coating layer. The method further includes providing a coating composition to a high transfer efficiency applicator, the high transfer efficiency applicator comprising a plurality of nozzles each being configured to apply a stream of the coating composition to a substrate substantially without atomization. The coating composition is a waterborne fluid that exhibits a near-Newtonian viscosity profile, and comprises a binder, a crosslinker, and a thickener. The method further includes applying the coating composition to the substrate with the high transfer efficiency applicator via disposing a plurality of lines of the coating composition onto the partially-dehydrated aqueous coating layer of the substrate via the plurality of nozzles, thereby forming an overspray free coating layer thereon.

A coating composition for application to a substrate utilizing a high transfer efficiency applicator. The coating composition includes a carrier and a binder. The coating composition has an Ohnesorge number (Oh) of from about 0.01 to about 12.6, the coating composition has a Reynolds number (Re) of from about 0.02 to about 6,200, and the coating composition has a Deborah number (De) of from greater than 0 to about 1730.

The utility model belongs to the technical field of vacuum coating, and discloses a material transfer system which comprises a carrier, a first transfer mechanism, a second transfer mechanism, a first conveying mechanism and a carrier mechanism arranged on the first conveying mechanism, wherein the first conveying mechanism is used for driving the carrier mechanism to move between a first station and a second station; the carrier on the first transfer mechanism can be transferred to the carrier mechanism located on the first station. The carrier on the carrier mechanism at the second station can be transferred to the second transfer mechanism; the carrying device is arranged at the first station and comprises a positioning carrier and a carrying robot, and the carrying robot is used for grabbing materials on the positioning carrier and loading the materials to the carrier located at the first station or used for grabbing the materials on the carrier located at the first station and loading the materials to the positioning carrier. According to the material transfer system, the material transfer efficiency is effectively improved, and the requirement for high productivity is met.

The utility model discloses building material transfer equipment which comprises a moving mechanism, a protection mechanism is installed on the top of the moving mechanism, and a containing mechanism for containing building materials is installed on the top of the protection mechanism. The moving mechanism comprises a mounting plate, and the bottom of the mounting plate is fixedly connected with a base; the containing mechanism comprises a containing frame, a nut seat is fixedly connected to an opening in the right side of the containing frame, a first screw is in threaded connection with the inner wall of the nut seat, and one end of the nut seat is rotationally connected with a limiting plate. The device has the advantage of being wide in application range, and the problems that in the process of transferring plate-shaped building materials through existing building material transferring equipment, the plate-shaped building materials of different specifications are inconvenient to fix, the application range of the transferring equipment is reduced, the protection effect is poor in the transferring process, and the transferring efficiency is high are solved. And the safety in the transportation process is reduced.

The invention discloses a method of forming a coating on a substrate. The method provides controlled application of overlapping strips to reduce significant overlapping areas. The method comprises: providing a high transfer efficiency applicator; receiving the image data and a predefined non-linear laying pattern; determining a plurality of overlapping strips, each strip being processable by at least one printhead and forming an overlapping region with an adjacent strip; distributing each overlapping area between adjacent strips, and distributing complementary parts of the non-linear laying pattern to the adjacent strips; applying a coating composition to at least one first strip using the applicator and forming a first portion of the non-linear lay-up pattern in at least one overlapping region thereof; and applying the coating composition to at least one second strip and forming a second portion of the non-linear lay-up pattern in the at least one overlap region.

The utility model discloses a bucket type blast hole backfilling device, which relates to the technical field of blast hole backfilling devices, and comprises a working table, a revolving platform, a control frame, an image detector and a bucket mechanism, the revolving platform is rotatably arranged above the working table, and the surface of the revolving platform is fixedly connected with the bottom of the control frame; one side of the control frame extends to form an image detector, and a bucket mechanism is installed below the image detector. When the bucket type blast hole backfilling equipment works, dust can be identified through the image detector, the dust is positioned and sent to the control mechanism through the sensor, and the position and the angle of the bucket mechanism can be flexibly adjusted according to the distribution condition of the dust; according to the bucket mechanism, accumulated dust is loaded through the arrangement of the rotating platform and the hydraulic oil cylinders, transferring and transporting of materials are achieved, the dust transferring efficiency is greatly improved, blast holes can be backfilled rapidly and effectively, and the construction period can be shortened.

A method includes applying a coating composition to a substrate through a high transfer efficiency applicator wherein the coating composition has a pH of greater than about 7 and comprises:A. a resin dispersion comprising a latex, a polyurethane, or combinations thereof;B. an optional cross-linker;C. an optional pigment;D. water;E. a water-soluble solvent; andF. at least one rheology control agent chosen from an alkali swellable emulsion, a layered silicate, and combinations thereof;wherein the coating composition has a viscosity of about 20 to about 100 cps as determined using ASTM 7867-13 with cone-and-plate or parallel plates at a shear rate of 1000 sec-1, andwherein the coating composition has a wet film thickness of at least 20 microns measured at about 45 degrees without visible sag.

This application relates to the technical field of transfer printing, specifically to a Fresnel lens texture UV transfer printing process, which includes the following steps: mold opening – coating with UV transfer adhesive – rolling and degassing – pre-curing treatment – ​​UV curing – demolding; wherein, the UV transfer adhesive is composed of the following raw materials in parts by weight: 20-35 parts acrylate, 30-50 parts modified epoxy acrylate, 15-25 parts reactive diluent, 5-15 parts photoinitiator, 1.5-4 parts antioxidant, 1-3 parts adhesion promoter, and 0.05-0.3 parts polymerization inhibitor. The Fresnel lens texture UV transfer printing process of this application, through rolling and degassing and pre-curing treatment, can improve the adhesion between the transfer substrate and the transfer template, making the transfer substrate less prone to falling off; the prepared UV transfer adhesive has good adhesion and flexibility to the transfer substrate, and the cured transfer film is less prone to texture tearing during demolding, improving transfer efficiency and transfer effect.

The application discloses a transfer module, a workpiece cleaning device and a coating production line. The transfer module comprises a rack, a first conveying mechanism and a double-shaft moving mechanism. The rack is used for horizontally placing a workpiece with a hooking groove and a hanging hole at the front end. The first conveying mechanism is arranged on the rack and is used for conveying the workpiece in the front-rear direction. A plurality of hanging racks with intervals are distributed on the running path of the first conveying mechanism. The double-shaft moving mechanism is installed on the rack. The first hook of the execution end of the double-shaft moving mechanism can slide in the left-right and up-down directions under the driving of the double shaft. The first hook can enter the hooking section from the opening guide section of the hooking groove, hook the horizontal workpiece and transfer the horizontal workpiece to the hanging rack. The hanging rack is hung on the hanging hole, so that the workpiece is suspended in the interval between adjacent hanging racks. The transfer module realizes the posture conversion of the workpiece from the horizontal placement to the vertical suspension. The complicated mechanical arm rotation conversion is not needed, the structure is simplified, the continuous conveying of the first conveying mechanism guarantees the continuous workpiece transfer, the transfer efficiency is effectively improved, and the guarantee is provided for subsequent workpiece cleaning and other processes.

The utility model discloses a ranitidine raw material transfer barrel, and relates to the technical field of ranitidine transfer containers, the ranitidine raw material transfer barrel comprises a transfer barrel with an opening at the top, a material accommodating space is arranged in the transfer barrel, a barrel cover can be hermetically covered at the opening at the top of the transfer barrel, and a material rod can penetrate through the barrel cover and extend into the material accommodating space. A material transfer opening connected and communicated with the material containing space is formed in the bottom of the turnover barrel, a switch valve is arranged at the material transfer opening, and a walking device is fixedly arranged at the bottom of the turnover barrel. According to the ranitidine raw material transfer barrel, the transfer efficiency can be improved, and the phenomena of dust pollution and moisture absorption are reduced.

The utility model relates to the technical field of conveying devices, and provides a feeding and discharging device which comprises a feeding component, a discharging component, a conveying carrier plate and a driving component. The feeding part comprises at least one first positioning conveying part; the discharging component comprises at least one second positioning conveying component. The conveying carrier plate is movably arranged between the feeding component and the discharging component and used for conveying the sheet bodies on the feeding component to the discharging component. A plurality of bearing plates used for containing sheet bodies are arranged on the conveying carrier plate side by side at intervals, and the driving component is used for driving the conveying carrier plate to complete feeding and discharging operation. The sheet bodies in the feeding component are supported and transferred through the conveying carrying plate to achieve feeding, the sheet bodies on the bearing plate fall down and are transferred to the discharging component to achieve discharging, and the conveying device has the beneficial effects of being high in transferring efficiency, small in sheet body position deviation and the like.

The utility model discloses a transfer device for flammable and explosive materials, which comprises a transfer track and a material carrier capable of moving along the transfer track, the transfer track is arranged in a water tank, at least one end of the water tank is provided with a mounting seat, and the mounting seat is provided with a water stop piece capable of floating up and down. The water stop piece is provided with at least one guide face used for guiding the material carrier to move to the transfer rail or leave from the transfer rail. Water in the water tank can infiltrate and clean the transfer track, static electricity and extrusion generated by friction are reduced, the risk of explosion when the material carrier moves along the transfer track can be greatly reduced, safety is improved, automatic transfer is facilitated, and the transfer efficiency is improved. When the material carrier needs to move to the transfer track or leave, the water stop piece can sink through the guide face, so that the water stop piece passes smoothly, and friction and extrusion between the material carrier and the water stop piece are reduced. And after the material carrier passes through, the water stop piece floats upwards, water overflowing in the water tank is reduced, and the transfer track is kept immersed in water.

The utility model relates to the technical field of glass cover plate processing, in particular to a glass cover plate processing transfer box, and solves the technical problems that a glass cover plate is easy to shake and damage in the transfer process in the prior art. A glass cover plate machining transfer box comprises a box body, containing grooves formed in the two sides of the box body, movably-connected baffles, limiting frames on the inner walls of the containing grooves, guide frames at the bottom of an inner cavity, limiting structures in the limiting frames, guide structures in the guide frames and a supporting plate at the bottom of the box body. By means of the design of the built-in limiting frame and the built-in guiding frame, shaking and damage of the glass cover plate in the transferring process are effectively prevented, transferring efficiency and safety are improved, and the actual requirement for machining and transferring of the glass cover plate is met.

According to the material transferring method, the distance between two adjacent materials in a single row on a first station is h1, the distance between two adjacent materials in a single row on a second station is t * h1, and t is an integer; the material transferring method comprises the steps that a conveying piece is adopted for taking out materials from a first station for t times, n materials with the single-row spacing being t * h1 are taken out each time, and the taken-out materials are conveyed to a second station; a single row of t * n materials are taken out from the second station at the same time through a conveying piece; the taken-out materials are released to the first station for t times, and n materials with the interval of t * h1 in a single row are released each time. Materials with the interval of t * h1 are taken out or released for t times at the first station, transfer of t * n materials is completed, transfer is conducted once between the first station and the second station, and the materials can be taken out or released at a time at the second station, so that the time for a conveying piece to move back and forth between the first station and the second station and the frequency of taking out / releasing the materials are reduced, and the working efficiency is improved. And the material transfer efficiency is improved.

Provided in the embodiments of the present application are a method for transferring a powder sample and a related product. The method for transferring a powder sample comprises: controlling a powder scooping and transferring apparatus to perform a powder scooping operation from a supply container; after the powder scooping operation is completed, acquiring a first weight m1 recorded by a weighing apparatus when a container holder is in contact with the weighing apparatus; controlling the powder scooping and transferring apparatus to perform a powder pouring operation into a target container, and after the powder pouring operation is completed, acquiring a third weight m3 recorded by the weighing apparatus when the container holder is in contact with the weighing apparatus; and on the basis of the third weight m3 and the first weight m1, obtaining a powder transfer amount ma. The embodiments of the present application can realize automated quantitative transfer of powder samples, thereby improving the transfer efficiency and accuracy of the powder samples.

The application relates to the technical field of glass production equipment, and discloses a glass production upper and lower sheet machine and a use method thereof, which comprises a mechanical arm, an adsorption mechanism and a positioning mechanism are arranged on the mechanical arm, the positioning mechanism comprises a shaft sleeve, multiple positioning plates and multiple support frames, the adsorption mechanism comprises a first linear driving assembly, a vertical shaft, a movable suction cup frame, multiple movable suction cups, a second linear driving assembly, a fixed suction cup frame and multiple fixed suction cups. When the movable glass is adsorbed, the pushing force of the glass on the movable suction cup makes the movable suction cup move, the impact is reduced, the movable suction cup is prevented from being deformed and damaged, the service life of the movable suction cup is prolonged, the glass edge is pushed by the positioning plate driven by the first linear driving assembly, the glass is accurately positioned, the operation of additionally adjusting the position of the glass after the glass is transferred in the prior art is omitted, the post-processing time is saved, the operation is simplified, the glass transfer efficiency is greatly improved, and the glass abrasion risk is reduced.

This utility model discloses an aging device for sludge treatment, relating to the field of sludge brick making. It aims to solve the problem that after aging, sludge cannot be directly dumped and requires extraction and transfer using other equipment. The key technical feature is that the top wall of the aging tank has an opening along the direction of gravity, and the side wall of the aging tank is cut off to provide a sludge outlet. A rotating cover plate is hinged to the outer wall of the aging tank to cover the sludge outlet. The bottom end of the rotating cover plate is rotatably connected to the bottom side wall of the aging tank. A guide plate extends from the side of the rotating cover plate near the aging tank, conforming to the inner side wall of the aging tank. A drive device is fixedly installed on the top wall of the aging tank to drive the rotating cover plate to open and close. This achieves the effect of allowing sludge to be stably discharged through the sludge outlet without additional extraction and transfer processes, effectively improving the transfer efficiency of the device.

The application discloses a heat pipe type fuel element, a reactor core and a method for operating the same and application thereof. The heat pipe type fuel element comprises coaxially fixed first and second substrates from bottom to top, both of which are hollow tubular structures and are in communication with each other; the inner side walls of the tubular structures of the first and second substrates are respectively provided with axially distributed first and second grooves, and the connecting part of the two is continuous without fault; the first substrate is made of metal or a moderator material, and fuel particles are dispersedly distributed in the interior of the first substrate, and the fuel particles have a coating layer; and the second substrate is a metal substrate without fuel particles. The heat pipe type fuel element of the application adopts an integrated design to avoid the heat efficiency problem and safety problem caused by gap thermal resistance, and ensures the close contact of the fuel particles and the heat transfer working medium. The reactor core of the application has simple and compact structure, high heat transfer efficiency, stable and reliable performance, and can meet the energy supply of multiple scenes and multiple purposes.

The invention discloses a falling film evaporator for drying high-viscosity materials. The falling film evaporator comprises a bottom frame, a shell, a disc assembly, a top plate, a material inlet, a material outlet, a hot water inlet and a hot water outlet. The disc assembly is installed in the shell through bolts, a plurality of alternately-inclined discs are arranged in the disc assembly, the inclination directions of the adjacent discs are opposite, through holes are formed in the discs, and after materials are evenly distributed through the top annular distributor, liquid film flowing is formed along the surfaces of the discs in sequence, the materials fall down step by step at the through holes, and an S-shaped reversing flowing path is formed. The high-viscosity fluid drying device can effectively dry the high-viscosity fluid, the disc type structure of the device has the remarkable technical advantages of being uniform in liquid film distribution, high in heat transfer efficiency, controllable in retention time, high in anti-scaling capacity, high in safety, wide in application scene and the like, and the device is particularly suitable for the evaporation process of the high-viscosity fluid such as energetic materials with the high friction and impact sensitivity requirement.

The utility model relates to sheet metal part transfer tool field, concretely relates to a kind of sheet metal part transfer tool of guard plate, including bottom plate, the guard rail is equipped on the bottom plate, the guard rail is equipped with flat support and inclined support in, the traction mechanism is equipped with in the both sides of bottom plate, by the U-shaped tube one and U-shaped tube two of soft shell wrapped on flat support and inclined support, realize the physical separation and buffer protection of guard plate sheet metal part in the process of transfer, effectively avoid the surface damage and deformation caused by mutual collision, reduce repair cost, utilize the structure design of U-shaped tube one and U-shaped tube two groove, realize the orderly positioning of guard plate sheet metal part, avoid stacking extrusion, and worker can quickly and conveniently take workpiece, significantly improve transfer efficiency.

The invention discloses a preparation method of a Cu-Cr-Nb / Cu composite material with a gradient structure. The preparation method specifically comprises the following steps that 1, precursor powder obtained after Cu-4Cr-2Nb and pure Cu powder are mixed in different proportions is prepared; 2, the precursor powder prepared in the step 1 in different proportions is pressed and formed; step 3, sintering the powder treated in the step 2; step 4, performing thermal deformation treatment on a product sintered in the step 3; step 5, carrying out cold deformation treatment on the product treated in the step 4; and step 6, performing annealing treatment on the product treated in the step 5, thereby obtaining the product. The invention further discloses the Cu-Cr-Nb / Cu composite material of the gradient structure. The problem that a traditional Cu-Cr-Nb composite material cannot have high heat transfer efficiency and high mechanical property at the same time is solved.

This invention relates to a DGT sampling device and method based on a glass sponge biomimetic eddy current anchoring structure, belonging to the field of environmental monitoring technology. The DGT sampling device includes a biomimetic outer shell, a filter protection layer, a diffusion layer, a bonding layer, and a base. The biomimetic outer shell includes a base grid layer and spiral guide ridges arranged along the axial direction of the outer shell on the outer surface of the base grid layer. The two ends of the biomimetic outer shell along its length are a closed end and an open end, respectively. The filter protection layer is disposed at the open end of the biomimetic outer shell. The diffusion layer is disposed on the side of the filter protection layer away from the biomimetic outer shell. The bonding layer is disposed on the side of the diffusion layer away from the filter protection layer. The base is used to fix the filter protection layer, diffusion layer, and bonding layer to the biomimetic outer shell. This invention aims to solve the problems of low mass transfer efficiency, measurement accuracy greatly affected by hydrodynamics, and susceptibility to physical wear and biofouling in existing DGT sampling technologies.

The invention provides a gravure roller for patterned coating of a battery diaphragm as well as a manufacturing method and a coating method of the gravure roller, and belongs to the technical field of battery diaphragm processing. High-quality processing of patterned coating of the battery diaphragm is realized through two optimization schemes: in the first scheme, glue solution residues are reduced through the design of the ceramic bottom layer, and the accuracy of a glue coating pattern is ensured through structural matching of micro ink cells, convex areas and concave areas, and meanwhile, the original air permeability of the diaphragm is reserved; in the second scheme, the electrowetting stack is combined with the partition pulse power supply assembly, intelligent control over carrying and releasing of the glue solution is achieved, the glue solution transferring efficiency is improved, and the gluing precision is further optimized. The manufacturing method of the two schemes is clear in process and high in operability, the corresponding coating method is efficient and stable, the requirement for large-scale production of the battery diaphragm can be met, and important industrial application value is achieved.

According to the high-temperature molten salt transfer tank and the application method thereof, a spiral winding type heating assembly and a double-layer aluminum silicate heat insulation structure are adopted, and the heat loss is reduced by 64%; the original sliding saddle design allows the tank body to freely expand in the axial direction, and the thermal stress is reduced by 74.4% according to tests; and meanwhile, high-temperature-resistant rollers and an intelligent transportation platform are arranged, so that + / -1mm accurate positioning is realized, and the service life of equipment is prolonged to more than 100,000 times of circulation. The technical problems that in the high-temperature molten salt transferring process, thermal stress damage is caused, and molten salt solidification is caused by heat loss and temperature reduction are effectively solved, and safety and transferring efficiency are remarkably improved.

A die bonding device and a working method thereof, the die bonding device comprising: a wafer table having a first bearing surface for bearing a wafer, the wafer table being capable of driving the wafer to move so as to sequentially move a plurality of wafers of the wafer to a wafer pickup position; the substrate table is provided with a second bearing surface used for bearing the substrate, the substrate table can drive the substrate to move so as to sequentially move the plurality of wafer bonding positions on the substrate to the wafer placing positions, and at least one of the first bearing surface and the second bearing surface is obliquely arranged relative to the horizontal plane; a mechanical arm of the rotating arm assembly rotates to transfer the wafer. At least one of the first bearing surface and the second bearing surface is obliquely arranged relative to the horizontal plane, so that the substrate table provides avoidance for placement and movement of a wafer and shortens a path for transferring the wafer to the substrate, and the length of the mechanical arm can be effectively shortened, so that the rigidity of the mechanical arm is improved; therefore, the accuracy of placing the wafer on the substrate by the mechanical arm and the transfer efficiency of the wafer are improved.

The embodiment of the present application provides a powder sample transfer method and related products, the powder sample transfer method comprises the following steps: controlling a scooping transfer device to perform a scooping operation from a source container; after the scooping operation is completed, a first weight m1 recorded by a weighing device is obtained under the condition that a container seat contacts the weighing device; controlling the scooping transfer device to perform a pouring operation into a target container, and after the pouring operation is completed, a third weight m3 recorded by the weighing device is obtained under the condition that the container seat contacts the weighing device; and a powder transfer amount ma is obtained according to the third weight m3 and the first weight m1. The embodiment of the present application can realize automatic quantitative transfer of the powder sample, and improve the transfer efficiency and precision of the powder sample.

The application relates to a two-dimensional material transfer device and a preparation method thereof, wherein the two-dimensional material transfer device comprises a substrate, an electrostatic generation layer arranged on one side of the substrate in the thickness direction, and an insulating layer arranged on the other side of the electrostatic generation layer in the thickness direction and away from the substrate; the electrostatic generation layer is made of a conductive material and is used for generating an electrostatic force on a two-dimensional material placed on a non-conductive initial substrate, so that the two-dimensional material is adsorbed on the surface of the insulating layer. The two-dimensional material transfer device can realize the transfer of the two-dimensional material, the whole transfer process is efficient and controllable, no pollution and impurities are introduced, the interface of the two-dimensional material is clean, and the defects of low transfer efficiency of the traditional dry transfer and easy introduction of pollution and impurities in the wet transfer are overcome.

The utility model discloses a transfer device for plastic product processing, and relates to the field of plastic product processing. Through the arrangement of the sleeves, the rolling wheels, the rubber layers, the telescopic rods, the sliding blocks, the springs, the protective pads, the protruding blocks and the guide plates, when the plastic rolls are transferred, the telescopic rods can flexibly adjust the distance between the two sets of guardrails according to different specifications of the plastic rolls, the plastic rolls with different specifications can be accurately adapted, and after the plastic rolls reach the proper positions, the plastic rolls can be conveniently and rapidly transferred. Under the elastic action of the springs, the two sets of guardrails can tightly clamp a plastic roll, the plastic roll is effectively prevented from rolling in the transferring process, the transferring stability is ensured, the surface of the plastic roll can be prevented from being scratched or damaged by arranging a rubber layer and a protective pad, and therefore the integrity of the plastic roll is guaranteed, and the transferring efficiency is further improved. In addition, extra cost expenditure caused by damage of the plastic roll is avoided, and the purpose of saving cost is achieved.