32 results about "Green tape" patented technology

The invention discloses a high-reliability packaging quality assessment method and system based on multi-source process data, and relates to the technical field of quality assessment, and the method achieves the online sensing of the orientation consistency of casting ceramic particles through the nondestructive scanning of an unsintered green tape by adopting a terahertz spectrum. Material waste and procedure interruption caused by destructive detection are avoided; secondly, the cutting edge morphology is synchronously collected in the scribing process, geometric feature quantification is carried out, the recognition of the edge breakage state is improved from subjective qualitative judgment to objective quantitative characterization, and the detection consistency and precision are remarkably improved; the frequency spectrum coding data reflecting the internal quality and the shape coding data reflecting the external defects are associated point by point, and a two-dimensional mapping relation of the internal process parameters and the external processing results is constructed, so that whether the cutting edge breakage is derived from potential abnormity in a tape casting stage or not can be accurately traced; and a data closed loop is provided for backtracking optimization of process parameters.

A roll-to-roll sintering system for wide inorganic tape material may include a spool on which is wound a continuous tape material comprising a green tape material and a backing layer, a take-up reel, and a heating station including at least one furnace. The heating station is configured to receive an unwound length of the continuous tape. The heating station further includes a first curved section such that the continuous tape material is bent through a radius of curvature of 0.01 m to 13,000 m, and at least two rollers defining the first curved section over which the continuous tape material is bent. The heating station is controlled to provide at least a portion of the heating station with an air free atmosphere, that being at least one of vacuum, hydrogen, or helium.

The application provides an isolated guide plating process for ceramic packages, which comprises: preparing ceramic slurry, then injecting the slurry into a casting machine to form green tape, and then cutting the green tape into green sheets; punching, injecting slurry and printing corresponding circuit on each green sheet, then laminating and cutting; printing circuit on each green sheet respectively, so that the required lead is metallized and led out from a substrate, punching so that the isolated guide area on the substrate is communicated with another substrate, so that the isolated guide area is led out and conducted from the other substrate; printing end, metallizing the lead and the isolated guide and sealing area; sintering; chemical nickel plating, assembling, soldering and electroplating, and finally polishing the end to obtain a ceramic package; and the bonding area and the chip bonding area are free of bumps.

The invention relates to a bone-like layered calcium silicate / tricalcium phosphate heterogeneous biological ceramic as well as a preparation method and application thereof. The preparation method of the bone-imitating layered calcium silicate / tricalcium phosphate heterogeneous biological ceramic comprises the following steps: (1) mixing calcium silicate powder, an additive and a solvent to obtain calcium silicate tape casting slurry; mixing the tricalcium phosphate powder, an additive and a solvent to obtain tricalcium phosphate tape casting slurry; (2) respectively carrying out tape casting on the calcium silicate tape casting slurry and the tricalcium phosphate tape casting slurry to obtain a calcium silicate green tape and a tricalcium phosphate green tape; (3) alternately laminating the calcium silicate green tape and the tricalcium phosphate green tape, and performing pressurization treatment to obtain a composite ceramic body; and (4) degumming and sintering the composite ceramic green body to obtain the bone-like layered calcium silicate / tricalcium phosphate heterogeneous biological ceramic.

This utility model relates to the field of raw material tape production technology, and in particular to a cooling and curing device for raw material tape production. It includes a housing with a first air outlet. A wind-cooling mechanism for cooling the raw material tape is connected to the housing. An open water tank is fixedly connected to the bottom of the housing. A first rotating roller is rotatably connected inside the open water tank. A second and third rotating rollers are rotatably connected inside the housing, with the first rotating roller located between the second and third rotating rollers. This utility model releases cold air to cool the raw material tape after the wind-cooling mechanism is activated. The cold air enters the housing and is released from the first air outlet. The raw material tape, cooled by the cold air, comes into contact with the cooling water in the open water tank. The cooling water provides secondary cooling to the raw material tape—first by the cold air, then by the cooling water—thus improving the cooling and curing effect of the raw material tape.

The invention relates to the field of ceramics for semiconductors, and discloses aluminum nitride ceramic tape casting slurry, a high-elongation aluminum nitride ceramic green tape and a preparation method and application thereof.The aluminum nitride ceramic tape casting slurry is prepared from, by mass, 70-75 parts of aluminum nitride raw powder and 25-30 parts of organic solvent through mixing and ball milling, the dispersing agent accounts for 0.5%-0.8% of the mass of the aluminum nitride raw powder, the binder accounts for 3%-10% of the mass of the aluminum nitride raw powder, the composite preparation accounts for 1%-9% of the mass of the aluminum nitride raw powder, and the composite preparation comprises dioctyl phthalate, dibutyl phthalate and dioctyl adipate according to the mass ratio of (2-4): (1-2): (1-2). By adopting the composite preparation with a specific ratio, the uniformity and flowability of the tape-casting slurry can be remarkably improved, the surface defects of a green belt are reduced, the elongation rate of the tape-casting slurry is up to 37%, the processing requirements of tubular curved surface structure aluminum nitride ceramic parts can be met, the cracking risk in the glue discharging and sintering process is reduced, and the service life of the tape-casting slurry is prolonged. The method can be widely applied to preparation of special-shaped ceramic elements for semiconductor equipment.

The invention provides a composite teflon tape for manufacturing a multi-layer circuit and a preparation method and application thereof. The composite teflon tape comprises a PET paper bottom and a CLST / EPF composite medium semi-cured film. The CLST / EPF composite dielectric semi-cured thin film is prepared by mixing EPF resin slurry and modified CLST ceramic powder and then performing semi-curing molding. The EPF resin slurry is composed of bisphenol F epoxy resin, methylhexahydrophthalic anhydride and 2, 4, 6-tri (dimethylaminomethyl) phenol; the modified CLST ceramic powder is CaOLiOSmOTiO ceramic powder which is modified by a KH-550 silane coupling agent, and the modified CLST ceramic powder is CaOLiOSmOTiO ceramic powder; the preparation method comprises the following steps: mixing the EPF resin slurry with the modified CLST ceramic powder, coating the mixture on the PET paper base, and then carrying out semi-curing molding. The prepared raw material belt can be semi-cured and formed at low temperature, the size stability is good, the dielectric constant can be regulated and controlled through the ceramic content, the dielectric loss is small, the preparation method can be compatible with an existing PCB production line, and therefore the manufacturing cost is reduced.

A sintered membrane is a ceramic article having a primary crystal phase including lithium-aluminum-titanium-phosphate crystals and a secondary crystal phase including anatase or lithium-titanium-oxyphosphate crystals. In aspects, the sintered membrane can have a closed porosity of less than or equal to 5%. In aspects, the primary crystal phase can be from 95% to 100% of a volume of the ceramic article, and the secondary crystal phase can be from greater than 0% to 5% of the volume of the ceramic article. In aspects, the sintered membrane can exhibit a total leaching of less than or equal to 5 parts-per-million in a Leaching Test. Methods of making a sintered membrane includes forming a green tape having lithium-aluminum-titanium-phosphate crystals and an additive including a titanium-containing powder or an aluminum-containing powder, where the green tape is heated to a first temperature from 600°C to 1200°C to form the sintered membrane.

This utility model relates to the technical field of positioning devices, and in particular to a positioning device for rotating tire carcass barcodes. During tire carcass rotation, a barcode detector scans the barcodes on the upper or lower part of the carcass, avoiding scanning limitations. A positioning component fixes the rotating housing, thereby improving the accuracy of the barcode detector when scanning the tire carcass barcode. The device includes a conveyor belt and a housing, with the housing positioned above the conveyor belt. It also includes a drive device, a positioning component, an adjustment device, multiple sets of clamping components, a bracket, and two sets of barcode detectors. The multiple sets of clamping components are all mounted on the housing via the drive device, moving in opposite directions. The housing is mounted on the positioning component, which drives the housing to rotate and move, and also positions the rotation of the housing. The bracket is horizontally mounted on the adjustment device, and the two sets of barcode detectors are mounted opposite each other on the upper and lower parts of the bracket.

The invention discloses acid-corrosion-resistant green slurry for LTCC (Low Temperature Co-Fired Ceramic) printing marks and a preparation method of the acid-corrosion-resistant green slurry, belongs to the field of LTCC and manufacturing thereof, and aims to provide slurry for marks, which is good in binding force with a ceramic body and is not easy to fall off after being sintered. The green printing paste capable of being applied to the field of LTCC is prepared from the raw materials according to the proportion of the powder and the organic binder, the paste can be co-fired with an LTCC green tape at the temperature of 850-900 DEG C, a green mark after sintering can be free of color fading and defect after being barreled for 20 minutes through a hydrofluoric acid aqueous solution with the concentration of 0.1 wt% at most, and the preparation method is simple and easy for large-scale production.

The invention discloses an electromagnetic shielding material for electrical equipment and a preparation method and application thereof, and relates to the field of electromagnetic shielding, and the preparation method comprises the following steps: preparing a multi-layer composite foil a and a multi-layer composite foil b, and respectively crushing the multi-layer composite foil a and the multi-layer composite foil b into multi-layer composite foil powder a and multi-layer composite foil powder b; mixing an adhesive with the multi-layer composite foil powder a and the multi-layer composite foil powder b to obtain slurry a and slurry b, performing gradient tape casting on the slurry a and the slurry b to obtain a primary green tape, and printing silver-based slurry on the primary green tape to obtain a silver-based green tape; after segmented degreasing is conducted on the silver-based green body belt, low-temperature activated sintering is conducted, then high-temperature densification sintering is conducted, and a gradient sintering material is obtained; and after the gradient sintering material is subjected to surface leveling treatment, a nickel-phosphorus protection layer is formed on the surface of the gradient sintering material through chemical plating, and the electromagnetic shielding material is obtained. The problems that shielding of a low-frequency magnetic field and shielding of a high-frequency electric field cannot be considered, and spectrum adaptability is insufficient are solved.

The invention relates to the technical field of thickness control, and discloses a ceramic green body tape casting thickness control method and device.The method comprises the steps that thickness measurement is conducted on a tape casting green body through a plurality of laser sensors arranged at the downstream preset position of a scraper, and the maximum deviation difference value is calculated; when the maximum deviation difference value is larger than a preset threshold value, a partition compensation mode is adopted, and when the maximum deviation difference value is smaller than or equal to the preset threshold value, a global compensation mode is adopted; when the partition compensation mode is adopted, the scraper left axis compensation amount, the scraper middle axis compensation amount and the scraper right axis compensation amount are calculated through the first compensation coefficient; when the global compensation mode is adopted, the unified compensation amount is calculated and assigned to the scraper left axis compensation amount, the scraper middle axis compensation amount and the scraper right axis compensation amount at the same time, and the control precision and uniformity of the casting thickness of the ceramic atomization core blank are improved.

A roll-to-roll sintering system for wide inorganic tape material may include a spool on which is wound a continuous tape material comprising a green tape material and a backing layer, a take-up reel, and a heating station including at least one furnace. The heating station is configured to receive an unwound length of the continuous tape. The heating station further includes a first curved section such that the continuous tape material is bent through a radius of curvature of 0.01 m to 13,000 m, and at least two rollers defining the first curved section over which the continuous tape material is bent. The heating station is controlled to provide at least a portion of the heating station with an air free atmosphere, that being at least one of vacuum, hydrogen, or helium.

The application discloses a preparation method of a multilayer composite crosslinking ceramic flow-casting green tape, which comprises the following steps: inputting slurry into multiple interval-mounted material boxes of a flow-casting machine, making the carrier tape pass through the material boxes and making the slurry in the material boxes be stacked on the carrier tape layer by layer to be flow-cast into a multilayer composite crosslinking flow-casting green tape; the slurry comprises silicon nitride ceramic powder, a sintering aid, a solvent, a binder, a dispersing agent, a plasticizer and a crosslinking agent; the plasticizer is at least one of cashew phenol Mannich tiglic acid ester, dibutyl phthalate, dimethyl phthalate and polyethylene glycol, and the dispersing agent is at least one of fish oil, castor oil and polyvinylpyrrolidone. The obtained green tape is uniform, smooth and flat, free of cracks, wrinkles and bubbles, has good toughness and high strength, is not easy to deform, and has adjustable thickness, and the problem that a crosslinking system ceramic green tape is difficult to flow thick is solved.

The invention provides a manufacturing method of a piezoelectric driving device and the piezoelectric driving device. The manufacturing method comprises the following steps: preparing piezoelectric ceramic slurry, and carrying out tape casting to obtain a green tape; punching on the green tape according to a set pattern, wherein the punching part is an electrode reserved area; printing and filling inner electrodes on the punched green tapes, and stacking the green tapes layer by layer; pressing the stacked green tapes into block green bodies through an isostatic pressing process; the block green bodies are cut into independent green bodies, and then the green bodies are subjected to glue discharging and sintering so as to be sintered into piezoelectric actuator chip units; grinding the sintered piezoelectric actuator chip unit to a specified shape and size; grooving the ground piezoelectric actuator chip units to form a rectangular or annular array; coating end electrodes on two opposite end surfaces of the piezoelectric driver chip units forming the array; welding the piezoelectric actuator chip unit coated with the terminal electrode on a circuit board, and electrically connecting the piezoelectric actuator chip unit with the circuit board; and after polarization, coating insulating glue, and then curing and molding.

The invention provides an LTCC raw material belt with a low thermal expansion coefficient, an LTCC substrate and a preparation method of the LTCC substrate, tape casting slurry is prepared by adjusting the proportion of silicon nitride ceramic, cubic boron nitride ceramic, CBAS and MASB microcrystalline glass powder, and the LTCC raw material belt with the low thermal expansion coefficient is obtained through tape casting; the raw material belt is sintered for 2-3 hours at 900-950 DEG C in a nitrogen atmosphere, good co-firing, flat interface and tight fitting with low-cost copper electrode slurry can be realized, an LTCC substrate with excellent comprehensive performance is prepared, the thermal expansion coefficient is 3.1-4.0 ppm / DEG C, the dielectric constant is 5.5-6.5, the dielectric loss is 0.002-0.004, the bending strength is 310-400 MPa, the thermal expansion coefficient is 3.1-4.0 ppm / DEG C, and the thermal conductivity is 30-44 W / (m.k). And the deformation quantity in a wide temperature range is small, and the heat dissipation performance is excellent.

A furnace system includes a heater contained in a heating chamber. A green tape is configured to contact a contact material while it is in the heating chamber. In aspects, the contact material includes iridium, osmium, rhenium, or an alloy thereof. Alternatively, the contact material is a lithium metal oxide where the metal is scandium or yttrium. In aspects, the contact material has a melting temperature of 1500°C or more, a gas phase oxygen concentration of 10-10 atmospheres or more, and a gas phase lithium concentration of 10-5 atmospheres or less. Methods include firing a green tape containing inorganic crystals by heating the green tape while in contact with the contact material. A sintered article includes a body having grains of inorganic material sintered to one another, where a concentration of iridium, osmium, rhenium on a first major surface is greater than or equal to 1 part-per-trillion.

A scored green tape (100) is disclosed. The scored green tape comprises a green ceramic material that has a first surface (108) and a second surface (112) opposite the first surface. The first surface and the second surface define a thickness (T) of the scored green tape. The scored green tape further comprises a score track (116) with an ablated region (120) that penetrates the green ceramic material (104) through the first surface. The ablated region is disposed along a contour (124) of the score track that extends parallel to the first surface. The ablated region has a depth from the first surface that is in a range of from about 20% to about 85% of the thickness of the scored green tape. The contour defines a section (128) of the green ceramic material configured to be separated after sintering of the scored green tape. In an exemplary embodiment, the scored green tape is scored via laser ablation.

The application discloses a copper paste, a preparation method and application thereof, and a multilayer ceramic device and a preparation method thereof, and relates to the technical field of low-temperature co-fired ceramics, wherein the copper paste comprises the following components in the following mass fractions: resin: 3-8 parts; organic solvent: 6.7-19 parts; organic additive: 0.1-2 parts; copper powder: 60-90 parts; glass powder: 0.1-10 parts; inorganic additive: 0.1-10 parts; and the median particle size D50 of the copper powder is 0.5-10 microns. When the copper powder is co-fired with a green tape, the shrinkage rate of the copper powder is consistent with that of the green tape, so that the copper paste and the green tape can be perfectly co-fired, and the problems of cracking, delamination or warping of the finally-prepared ceramic device can be avoided.

A green tape composition for forming a green tape, the composition including a ceramic powder and a radiation-curable binder composition comprising a photoinitiator, a monomer, and a dispersant. The ceramic powder is present at a concentration of greater than 40 vol. %. The porosity of the green tape is less than 10%. The green tape is sintered at a temperature range from 950°C to 1500°C to form a continuous ribbon ceramic.

The utility model belongs to the technical field of raw material belt degreasing, particularly relates to a raw material belt degreasing machine, and aims to solve the problems that when an existing degreasing machine is used, the degreasing effect is poor due to the fact that a heating plate is only used for heating for degreasing, the heating plate is located below raw materials, degreased materials can drop on the heating plate, the using effect is affected, the degreased raw materials cannot be rapidly cooled, and the degreasing effect is poor. According to the technical scheme, the raw material degreasing device comprises a degreasing box used for degreasing and storing raw materials, a discharging hole is formed in the left side of the degreasing box, and a feeding hole is formed in the right side of the degreasing box. According to the raw material degreasing device, degreasing is conducted in a heating mode, raw materials can be scraped and degreased through the scraping plate, the degreasing effect of the raw materials can be improved, degreased water drips into the collecting box and can be collected, the raw materials can be cooled, and the situation that the service life is affected by high-temperature rolling is avoided.

A solid-state electrolyte sheet includes stabilized zirconia grains having from 3 mol % to 12 mol % of a dopant selected from alumina, cerium oxide, gadolinium oxide, scandia, yttria, ytterbia, and combinations thereof. In aspects, the solid-state electrolyte sheet exhibits an ionic conductivity of 6.79 S / m or more at 800° C. or 8.8 S / m or more at 835° C. In aspects, the stabilized zirconia grains can exhibit a ratio of a cubic phase to a tetragonal phase (C / T ratio) of 0.12 or more. In aspects, the solid-state electrolyte sheet can be part of a solid oxide fuel cell and / or a solid oxide electrolyzer cell. Methods include casting a green tape comprising stabilized zirconia and firing the green tape by heating to form a sintered tape and then quenching the sintered tape from a starting temperature of 600° C. or more to a final temperature of less than 100° C.

Disclosed herein are embodiments of a method in which a continuous green tape is fired in a furnace to form a ceramic ribbon of sintered lithium garnet. The continuous green tape includes particles of lithium garnet that are coated with a passivation layer or that have been tape-cast in a dry atmosphere. The continuous green tape has a length, a width, and a thickness. The width is greater than the thickness, and the length is greater than the width. The continuous green tape has a linear shrinkage of less than or equal to 25% after firing to form the ceramic ribbon.

The invention relates to the technical field of inductor manufacturing, in particular to a laminated chip inductor and a preparation method thereof. The preparation method of the laminated chip inductor comprises the following steps: preparing ferrite slurry into a green tape by adopting a tape casting process; forming a through hole in the green tape to obtain a through hole membrane; removing the preset area of the green tape to form a vacant area for printing; printing electrode slurry on the through hole diaphragm to form a lead-out layer; printing electrode slurry on the through hole diaphragm to form an electrode layer; printing conductive paste in the vacant area of the dielectric diaphragm to form a connecting layer which is nonlinear; laminating the cover plate membrane, the lead-out membrane and the electrode membrane together according to a preset sequence to form a block; and sequentially carrying out isostatic pressing treatment, cutting operation and sintering operation on the block to form the laminated chip inductor. The production cycle can be shortened, and the production cost can be reduced.

Various aspects of the present disclosure relate to a method of processing a ceramic substrate. The method includes providing a green-tape ceramic material. The green-tape ceramic material is passed through an oven (102) to form a ceramic ribbon. A parameter of the ceramic ribbon, such as thickness or surface texture, is monitored by an attribute measurement apparatus (114), such as an infrared scanner. Finally, a portion of the ceramic ribbon is exposed to a heat source (112), such as a laser beam. The portion of the ceramic ribbon is exposed to the heat source for an amount of time sufficient to correct a defect in the portion of the ceramic ribbon.

The utility model discloses a raw material belt plastic core injection mold, including ejection seat, die holder, the die holder sets up at the top of ejection seat, the inside fixed connection of die holder has lower mould, the top equidistance of lower mould is connected with male model cavity, the four corner of die holder top is connected with guide rod respectively, the outside of guide rod is connected with upper mould and is equipped with injection hole in the middle of upper mould top side, and the bottom side equidistance of upper mould is equipped with female model cavity, and is matched and is embedded and is connected through female model cavity and male model cavity, the right side of die holder is connected with the material taking subassembly, can take the material of raw material belt plastic core in male model cavity quickly, can cool down lower mould bottom, compares through the natural wind, and the initiative air blowing can make the workpiece cooling rate of lower mould and its inside greatly improve, can take the material of multiple workpieces one time and hang and support material and wait for workpiece collection, and the security and convenience of use operation greatly improve.

The invention discloses a high-stability release film for forming a substrate green tape and a preparation method of the high-stability release film. The release film comprises a base material layer, a corona layer, a high-adhesion low-expansion buffer layer, a high-modulus anti-shrinkage layer and an organic silicon release layer which are sequentially stacked, according to the invention, the low-expansion buffer layer is designed on the corona layer, the modified ZrW2O8 microspheres are added into the epoxy acrylic resin, and the negative thermal expansion property of the modified ZrW2O8 microspheres is utilized to carry out gradient buffer in the high-temperature coating process of the release film, so that the internal stress can be effectively dispersed. The invention provides the high-performance release film which can be well used for LTCC (Low Temperature Co-Fired Ceramic) raw tape casting, and the release film has the advantages of high-temperature low shrinkage, organic solvent friction resistance and stable release force, so that the stable production of the raw tape and the repeated usability can be ensured in the subsequent substrate raw tape casting process.

The invention relates to ceramic substrate processing production equipment, which comprises a feeding structure, a conveying structure, a conveying structure, a conveying structure and a control structure, and is characterized in that the feeding structure is used for conveying green ceramic tapes; the cutting structure is used for cutting the green tape so as to form a substrate; the turn-over structure is used for turning over the substrates at intervals; the powder applying structure comprises a powder applying assembly used for applying powder to the surface of the substrate and a circulating adsorption assembly arranged below the powder applying assembly; the stacking structure is used for stacking the substrates coated with the powder; a shaping structure, wherein the shaping structure is used for shaping the stacked substrates; and the tray loading structure is used for loading the shaped substrates into the loading tray. The ceramic substrate processing production equipment is high in automation degree, manual participation is not needed in the whole process, the production efficiency of the ceramic substrate is improved, the labor cost input is saved, and the safety coefficient is higher.

This invention belongs to the field of electronic materials technology, specifically relating to a low-temperature co-fired non-ruthenium-based embedded resistor paste and its preparation method. This invention utilizes non-ruthenium-based La... 0.5 Sr 0.5 Co 0.96 Ni 0.04 O3 or La 0.5 Sr 0.5 Co 0.94 Nb 0.06 O3 ceramic, as the conductive phase, reduces material costs and avoids the high-temperature oxidation drawbacks of traditional metal materials. Combined with Bi2O3-B2O3-SiO2-ZnO and Li2O-Bi2O3-B2O3-SiO2+TiO2 as inorganic binder phases, and further supplemented with an organic carrier, a non-ruthenium-based resistive paste is constructed. Embedded resistors prepared using this resistive paste can be co-fired with multilayer dielectric ceramic green tape (dielectric constant ≤ 8) at 925℃. After sintering, the matching performance is good, with no obvious warping or delamination, demonstrating good process adaptability. The resistors can be embedded and integrated into multilayer ceramic circuit boards using LTCC technology. This invention features low cost and high performance, providing a foundation for the embedded integration of resistive elements into multilayer ceramic substrates.

The utility model discloses a damage detection device for expanded raw material belt finished product detection, and relates to the technical field of expanded raw material belt production, the damage detection device comprises a detection frame and an expanded raw material belt damage detection assembly, the middle position of a supporting driven roller is provided with a laser belt emitter, the upper side of the laser belt emitter is provided with a laser belt light sensor, and the upper side of the laser belt light sensor is provided with a laser belt light sensor; a visual scanning camera is installed on the right side of the laser band light sensor, the expansion raw material band passing through the supporting driven rolling shaft can emit laser from bottom to top by the laser band emitter, and in the process, if the expansion raw material is provided with leakage holes, the expansion raw material band cannot be damaged. When the expansion raw material belt is damaged, laser is emitted into the laser belt light sensor through the leakage holes for irradiation and laser signal collection, so that the damage position and the damage degree can be collected in a targeted manner, and as the overall color of the expansion raw material belt is consistent and is mostly milk white, the visual scanning camera can visually scan the color of the expansion raw material belt, and the damage degree of the expansion raw material belt is improved. Therefore, whether the material of the teflon tape is uniform is determined.