686 results about "Adhesion strength" patented technology

The invention discloses a tissue adhesive based on mussel mucin as well as a preparation method and application thereof. The tissue adhesive is prepared from mussel mucin and an anionic compound containing a hydrophobic group, the mussel worm electrostatic self-assembly bionic composite material is developed on the basis of triple bionic principles of dopa adhesion of mussel byssus, electrostatic self-assembly polymerization of sandburg worms and hydrophobic acting force of barnacles. The preparation method of the tissue adhesive is simple, the tissue adhesive can be obtained only by mixing and oscillating the two stock solutions, the gel forming condition is simple and easy to implement, the pH range and the stock solution concentration range required by gel forming are large, the gel forming range is wide, the raw materials required in the preparation process are few, and the cost is low. Only two key raw materials including the mussel mucin and the anionic compound containing the hydrophobic group are needed, and the prepared tissue adhesive is high in adhesion speed and high in adhesion strength, has good cell compatibility and biological safety and can promote wound healing.

The invention discloses an acrylate conductive composite pressure-sensitive adhesive and a preparation method thereof. The acrylate conductive composite pressure-sensitive adhesive comprises a raw material A and a raw material B, wherein the raw material A comprises 5-15 parts of acrylate polymer; 0.10 to 1.00 parts of epoxy resin; 1.0 to 10.0 parts of aniline; 0.1 to 1.0 part of an initiator; 1-5 parts of conductive particles; and 0.010 to 0.100 part of an amine curing agent. The acrylate conductive composite pressure-sensitive adhesive disclosed by the invention has excellent conductivity and capacitance sensing performance, and shows excellent capacitance stability and relatively high sensitivity in a pressure cycle test; on the basis of containing the conductive filler, the pressure-sensitive adhesive still has better hardness, adhesion strength and tensile strength, and the conductive filler is well dispersed and combined in a pressure-sensitive adhesive system.

The invention discloses a strain sensor based on multifunctional hydrogel, a flexible supercapacitor and a preparation method and application of the strain sensor and the flexible supercapacitor, and belongs to the technical field of flexible wearable sensors. By regulating and controlling the contents of BC, TA and LiCl, the mechanical property of the hydrogel is remarkably improved, and the balance of elongation at break and tensile strength is realized. Due to the introduction of TA, the hydrogel is endowed with excellent adhesion performance, and adjustable adhesion strength can be realized by regulating and controlling the content of TA. In addition, the hydrogel is endowed with excellent anti-freezing and water-retaining properties by LiCl. The hydrogel strain sensor has the advantages of high sensitivity, high response speed and the like.

The invention relates to the technical field of batteries, and particularly discloses a current collector, a method for preparing the current collector, a pole piece, a lithium ion battery and a power utilization device.The current collector comprises a base material and a conductive coating arranged on at least one side of the base material, and physical crosslinking points are evenly distributed in the conductive coating; the physical cross-linking points are non-covalent bond connecting points and comprise coordinate bonds between the binder and metal ions and / or hydrogen bonds between the binder and the polyhydroxy compound. The physical cross-linking points can effectively improve the adaptability of the conductive coating to the expansion and shrinkage stress of the active material layer in the long-term circulation process, the physical cross-linking points can be self-generated again after being damaged, the cross-linking structure improves the adhesion strength of the conductive coating to the current collector, meanwhile, the conductive coating has excellent fatigue resistance, and the service life of the conductive coating is prolonged. After long-term circulation, the high cohesiveness is still kept, and the phenomena of interface separation and active substance powder falling are not prone to occurring.

The invention relates to the technical field of rubber material performance detection, in particular to a dynamic test platform and method for evaluating the bonding effect and fatigue life of rubber and a rubber cord fabric. The dynamic test platform comprises a driving mechanism, a test platform, a clamping mechanism, a monitoring system, a data acquisition module, a control system and a data analysis module. The driving mechanism can adjust the frequency, the displacement amplitude and the acceleration of loading deformation; the test platform supports normal loading pressure to realize simulation of different load working conditions; the clamping mechanism is a two-way adjustable clamp, and free displacement is achieved through a sliding rail mechanism; the monitoring system integrates a force sensor, a displacement sensor and a temperature sensor. The data acquisition module records loading process data; the control system sets parameters through a touch interface and monitors the test in real time; and the data analysis module generates an adhesion performance, fatigue life and damage form evaluation report based on an algorithm. The device can accurately reproduce the adhesive property change under the dynamic working condition, comprehensively analyzes the adhesive strength and fatigue life, provides a scientific basis for research and development and quality control of rubber products, and is suitable for testing the adhesive property of composite materials such as tires and transmission belts.

In a method of manufacturing a semiconductor device, a gate dielectric layer is formed over a channel region made of a semiconductor material, a first work function adjustment material layer is formed over the gate dielectric layer, an adhesion enhancement layer is formed on the first work function adjustment material layer, a mask layer including an antireflective organic material layer is formed on the adhesion enhancement layer, and the adhesion enhancement layer and the first work function adjustment material layer are patterned by using the mask layer as an etching mask. The adhesion enhancement layer has a higher adhesion strength to the antireflective organic material layer than the first work function adjustment material layer.

The invention discloses a novel marine antifouling gel coating material. The novel marine antifouling gel coating material comprises an antifouling gel monomer, a hardness modifier, an initiator and water, the antifouling gel monomer is an acrylamide series derivative compound or a polyethylene glycol derivative; the hardness modifier is a high polymer capable of providing a hydrogen bond donor or acceptor; the initiator is an organic initiator capable of initiating free radical polymerization of double bonds. The coating material provided by the invention is covalently bonded with an engineering bottom surface needing antifouling through a siloxane compound. A coating prepared from the marine antifouling hydrogel coating material provided by the invention has an excellent antifouling effect and also has excellent physical properties and adhesion strength, and the stability and durability of the antifouling coating can be ensured. In addition, due to the environmental friendliness of the material, the material has a wider application range, and powerful support is provided for the anti-fouling requirement of engineering in the ocean field.

The invention discloses a preparation method of a composite micro-groove super-hydrophobic low-ice-adhesion photo-thermal film. The preparation method comprises the following steps: (1) constructing a low-elasticity-modulus photo-thermal composite sponge substrate through a solvothermal method; (2) uniformly coating the surface of a substrate with a polydimethylsiloxane (PDMS) precursor solution by adopting an aerosol-assisted deposition technology, and carrying out thermocuring to form a functional composite interface layer; and (3) constructing a multi-stage scallop surface-imitating micro-nano groove composite structure on the surface of the interface layer by using a femtosecond laser micro-nano processing technology. The prepared film has super-hydrophobicity, the surface of the film is in a Cassie-Baxter wetting state with a 164-degree contact angle and a 1-degree rolling angle, and the film has a surface self-cleaning function. Under the icing condition, the adhesion strength of an ice layer of the system is obviously reduced to 2.57 kPa, the static delay icing time is effectively prolonged to 1587 s, and the system has the photo-thermal response characteristic and can realize rapid icing ablation under the standard solar irradiance; the preparation method has the characteristics of high process controllability, environment friendliness and the like, and is suitable for large-scale continuous production.

The invention discloses a current collector composite copper foil film spreading method and device, and the method comprises the steps: applying a DC electric field to a current collector composite copper foil, forming an interface charge separation layer, obtaining reference capacitance distribution data, applying a film spreading tension to enable the material layers to generate microscopic displacement, and obtaining capacitance change data. The method comprises the following steps: analyzing and identifying an abnormal adhesion area through time domain difference and sliding window correlation, applying periodic micro-stress disturbance to the abnormal area to establish a stress-capacitance response relation to invert adhesion strength spatial distribution, and periodically recording a capacitance reference value to evaluate the interface adhesion fatigue degree. The device comprises an electric field processing module, a film spreading tension module, a correlation analysis module, a stress disturbance module and a fatigue evaluation module. According to the scheme, real-time dynamic detection and quantitative evaluation of the interlayer adhesion strength in the current collector composite copper foil film spreading process can be realized, the interface adhesion failure and fatigue accumulation state can be effectively identified, and accurate technical support is provided for battery current collector preparation process optimization and product quality control.

The present application discloses a one-component solvent-free epoxy-modified polyurethane waterproof coating, its preparation method and a waterproof product. The coating comprises the following raw material components in parts by weight: polyether diol, 100 parts by weight; polyether triol, 30 - 80 parts by weight; epoxy vegetable oil plasticizer, 80 - 120 parts by weight; pigments and fillers, 200 - 350 parts by weight; diisocyanate, 14 - 20 parts by weight; modified epoxy resin A, including a terminal epoxy group and an epoxyalkyl acrylate monomer-derived chain segment, 9 - 17 parts by weight; hydroxyoxazoline, 2 - 11 parts by weight, and the hydroxyoxazoline is an oxazoline compound containing one active hydroxyl group; active diluent, 70 - 100 parts by weight; defoamer, 1 - 3 parts by weight; dispersant, 0.1 - 0.5 parts by weight; latent curing agent, 12 - 41 parts by weight; catalyst, 0.4 - 1.8 parts by weight. The above coating can effectively improve the problem of poor adhesion strength retention rate of traditional polyurethane waterproof coatings after being soaked in water, and the product has excellent performance.

The invention provides a low-energy-consumption mechanical anti-icing and de-icing device and method and an aircraft skin structure, and the device comprises a passive anti-icing part which comprises an elastic interlayer, and the elastic interlayer is used for being adhered to the first side face of a skin of an aircraft; the elastic interlayer at least comprises a lubricating material capable of reducing the ice adhesion strength; the active deicing part comprises a force applying device, and the force applying device faces the second side face, away from the first side face, of the skin; wherein the aircraft is frozen to form an ice layer-elastic interlayer-skin three-layer structure under the freezing condition, the force application device applies stress load to the second side face of the skin, and the ice layer is actively induced to be broken; through deformation of the elastic interlayer, stress load is concentrated on the ice layer, critical fracture displacement needed for inducing fracture of the ice layer is passively reduced, and meanwhile, through the anti-adhesion effect of the elastic interlayer, the fractured ice layer is promoted to fall off from the elastic interlayer. Through the device provided by the invention, efficient deicing with low energy consumption, repeated use and no damage to the skin structure is realized.

The invention discloses a long-time strong-adhesion tissue repair patch and a preparation method thereof, and the preparation method comprises the following steps: adding an adhesion component, an anti-swelling component and alpha-ketoglutaric acid into a colloidal aqueous solution of a patch matrix material to obtain a precursor solution; and pouring the precursor solution into a patch mold, carrying out ultraviolet curing, and drying the obtained gel to obtain the patch. From the selection of materials and chemical bonds, physical and chemical bonds such as amido bonds, disulfide bonds and catechol groups are combined, so that the adhesion strength is improved, the adhesion duration is prolonged, and the adhesive has excellent anti-swelling performance and mechanical performance, can effectively isolate external saliva, food residues and the like when being applied to the oral cavity, reduces infection of ulcer wounds, and has a good application prospect. The dental ulcer healing is accelerated, and the method also has a relatively good application prospect in the field of tissue repair.

The invention relates to a four-degree-of-freedom icing adhesion strength testing device and a testing method. The testing device comprises a fixed platform, and a refrigerating and freezing module and a four-degree-of-freedom motion testing module which are arranged on the fixed platform. The fixed platform comprises a flat plate and a height-adjustable telescopic rod. The refrigerating and freezing module comprises a refrigerating platform, a refrigerating plate inclination angle assembly and at least one ice making mold. The four-degree-of-freedom motion test module comprises a Z-axis moving sliding table, a Y-axis rotating inclination angle assembly, an X-axis moving sliding table, a Y-axis moving sliding table, a pull and push dynamometer clamp and a pull and push dynamometer; the pull and push dynamometer can drive ice blocks in the ice making mold to be separated from a test sample under the driving of the Z-axis moving sliding table, the Y-axis rotating dip angle assembly, the X-axis moving sliding table and the Y-axis moving sliding table. Compared with the prior art, the device has the advantages of high experiment efficiency, wide measurement range, adjustable experiment parameters, diversified measurement modes and the like.

The invention provides a single-component modified silane adhesive as well as a preparation method and application thereof. The adhesive is prepared by mixing the following components: silane modified polyether resin, silane modified polymer resin, a plasticizer, a composite light stabilizer, a filler, a rheological additive, a water removal agent, a coupling agent and a catalyst, the silane modified polyether resin is silane-terminated resin prepared by a hydrosilylation method; the silane-modified polymer resin is a silane-terminated polymer resin containing a urethane bond. The adhesive is excellent in comprehensive performance, the tensile strength of a body is larger than 3 MPa, the elongation at break is larger than 450%, the adhesive is high in adhesion universality to metal base materials, PET films, ceramics, glass, wood floors, PVC, PC, ABS, wood-plastic composite materials and paint faces, the base materials do not need to be specially treated, the damage form is cohesive failure, and the adhesive has good adhesion strength, tear resistance and excellent temperature resistance and is suitable for being applied to the field of wood products. After aging at 120 DEG C for one week, the tensile strength of the body is greater than 3 MPa, the elongation at break is greater than 430%, and the surface layer can be coated after curing.

The invention provides experimental equipment and method for simulating determination of adhesion strength of a deep sea substrate and a track shoe, the experimental equipment is composed of a sample loading assembly, a measuring disc assembly, a mechanical loading rack, a servo motor loading device and a data acquisition and control system, and three servo motors are used for controlling a metal test piece and vertical displacement and tangential torsion; dynamic pressure servo on a deep-sea substrate-metal contact interface is completed through a data acquisition and control system, cyclic load generated by a thrust wheel of a mining vehicle is simulated, and the influence of dynamic load on the adhesion characteristic of the deep-sea substrate-metal interface is explored. And an effective means is provided for measuring the adhesion strength of the deep-sea substrate-metal interface and selecting a deep-sea mining vehicle caterpillar band tooth material.

To provide a conductive paste capable of yielding a cured product (high-thermal-conductivity material) that is excellent in thermal conductivity as well as in adhesion strength and connection reliability.SOLUTION: The conductive paste of the present invention contains: particles having a surface composed of silver; and an adhesion promoter. The adhesion promoter contains a compound represented by the general formula (1) in the figure.SELECTED DRAWING: None

The invention provides an adhesive with high adhesion strength for a low-surface-energy material as well as a preparation method and application of the adhesive, and relates to the field of materials. The adhesive comprises a fluorinated hard segment and a long polymer chain soft segment with a plasticizing effect, the fluorinated hard segment monomer corresponding to the fluorinated hard segment comprises a fluorinated methacrylate monomer; the soft segment monomer corresponding to the long polymer chain soft segment with the plasticizing effect comprises a polyether methacrylate monomer. The preparation method of the adhesive comprises the following steps: mixing the fluorinated hard segment monomer, the soft segment monomer and an initiator to obtain a precursor liquid; and carrying out polymerization reaction on the degassed precursor liquid, and then carrying out vacuum drying to obtain the adhesive. The adhesive provided by the invention has excellent bonding strength, does not need to carry out surface pretreatment on materials, reduces the production cost, and provides a new idea for the development of bonding of low-surface-energy materials.

The invention discloses experimental equipment and method for determining the interface adhesion strength of soil and a shield cutter head under the action of seepage, the experimental equipment comprises a soil sample negative pressure seepage device and an adhesion strength measuring device, the soil sample negative pressure seepage device comprises a support and a permeator, the support is provided with a holder and a water supply system, and the permeator is clamped on the holder. The research blank that the influence of underground water seepage on the adhesion strength is not considered in existing shield adhesion research is filled, and meanwhile the problems that existing adhesion research experiment equipment is expensive, and the operation process is complex are solved. According to the invention, the adhesion strength between different types of viscous soil and the surface of the metal flat plate can be measured under different loading pressures under the seepage action of different properties of underground water, different seepage negative pressures, different time and other conditions under different dry densities; and a basis is provided for adhesion evaluation during shield tunneling in soil under the action of underground water seepage under different conditions in actual engineering.

The invention discloses a laser cleaning method and system for residual sand of a sand casting mold, and the method comprises the steps: S1, obtaining point cloud data of the surface of the mold through a three-dimensional scanner, reconstructing a triangular mesh model M (V, E, F) of the surface of the mold, V being a vertex set, E being an edge set, and F being a surface set; s2, based on the triangular mesh model, a laser cleaning path is planned; S3, a laser head is controlled to move along the path, and laser is emitted to remove residual sand; according to the method, the residence time calculation model is introduced, the laser residence time is dynamically set by combining the region area, the material removal difficulty coefficient and the characteristic parameters, the adhesion strength signal of the surface of the mold under the laser action is detected in real time through the acoustic emission sensor, error feedback is formed, the laser power, the pulse frequency and the residence time are dynamically adjusted, and the mold surface quality is improved. And the self-adaptive response to the thickness and the adhesion strength of the residual sand in different areas is realized.

The invention relates to the technical field of adhesives, and discloses an imidazolium ionic liquid and a preparation method and application thereof, the preparation method comprises the following steps: reacting omega-bromoalcohol with 1-(methoxymethyl) imidazole in acetonitrile, and washing with methyl tert-butyl ether to obtain a target ionic liquid precursor; and dissolving the product in acetonitrile, adding 4-trifluoromethyl phenyl isocyanate, and washing with methyl tert-butyl ether after the reaction is finished, thereby obtaining the target imidazolium ionic liquid. The imidazolium ionic liquid disclosed by the invention is applied to a PVB (Polyvinyl Butyral) adhesive, and the PVB adhesive shows excellent adhesion strength in a macroscopic adhesion performance test on the basis of multiple interactions, and particularly has excellent adhesion strength on aluminum. The obtained adhesive can be universally adapted to various substrates such as metal substrates and macromolecule substrates, and finally high-strength and high-durability intelligent adhesion performance is achieved.

To provide an adhesive composition capable of lowering an adhesive strength sufficiently by applying a voltage even in a low humidity environment.SOLUTION: An adhesive composition at least includes a polymer and ionic liquid. An adhesive layer is formed by a composition composed of components other than the ionic liquid from among included components. The adhesive layer has a dielectric constant of 5 or more at a frequency 100 Hz after the adhesive layer has been left standing under an environment at 22°C and 20%RH for three days.SELECTED DRAWING: Figure 1

The invention discloses injectable hydrogel as well as a preparation method and application thereof. The hydrogel is a chemical-physical double-network cross-linked hydrogel prepared from a blended solution with magnesium acrylate, carboxymethyl chitosan and phytic acid as main components. Wherein covalent cross-linking is derived from a magnesium polyacrylate network constructed by free radical polymerization reaction. Non-covalent cross-linking is derived from hydrogen bonds and electrostatic interaction among components in an interpenetrating network and a carboxymethyl chitosan chain entanglement network formed by gradual induction in the application process of a physiological environment. In the preparation process, the pH value of a reaction system is controlled by controlling the concentration of phytic acid, magnesium ions are chelated, then the structural strength of the hydrogel is controlled, and the injectable effect is achieved. Meanwhile, phytic acid can be chelated with protein, so that the adhesion of the phytic acid to tissues is enhanced. The preparation process is simple and convenient, easy to control and suitable for large-scale industrial production, and all the raw materials are easy to obtain and low in price. The hydrogel has high adhesion efficiency and wet adhesion strength to tissue.

The invention provides a seawater soaking wound hydrogel dressing and a preparation method thereof, a drug-loaded nano system 4OI (at) ZIF-8 (at) PAD with a core-shell structure is constructed, an anti-inflammatory drug 4-octyl itaconic acid and zinc ions are jointly encapsulated in a ZIF-8 framework, and a polydopamine coating is wrapped, so that synergistic loading and controllable release of the drug and metal ions are realized. According to the dressing, dopamine modified hyaluronic acid is used as a matrix, a temperature-sensitive material and an enzyme catalysis cross-linking system are combined, stable gel can be rapidly formed in situ within 5 seconds, and the dressing has excellent tissue adhesion performance (the adhesion strength reaches 6.7 kPa). Experiments prove that the hydrogel dressing has the characteristics of broad-spectrum antibiosis, inflammation regulation and control and long-acting release. Animal experiments prove that the healing rate of seawater soaking wounds treated by the dressing on the twelfth day is as high as 95.7% and is remarkably superior to that of a commercial silver ion gel control group, scars are less after healing, and an efficient, safe and easy-to-implement scheme is provided for marine environment wound nursing.

The present invention addresses the problem of providing an adhesive composition having excellent tensile lap-shear strength and T-peel strength, and being capable of maintaining adhesion performance even when lap length is increased, while having high adhesive strength at joints. As a solution, provided is an adhesive composition characterized in that the fracture energy per unit area is 0.035 J / mm2 or more in a tensile lap-shear adhesion test when the fracture region is an adhesive layer.

The application belongs to the technical field of polymer materials, and proposes a high-adhesion-strength flame-retardant waterproof composite board for tunnels and a preparation method and application thereof, which comprises: a, a waterproof board layer, raw materials of which include a flame retardant A; b, a polyurethane layer, which is sprayed on the surface of the waterproof board layer and is prepared from polyols and isocyanate at an isocyanate index R=1-1.1, wherein the polyols include a chain extender, a foaming agent, a foam stabilizer, a catalyst, a polyether polyol, water and a flame retardant B; wherein the flame retardant A is microencapsulated red phosphorus modified by vinyl triethoxysilane, and the flame retardant B is microencapsulated red phosphorus modified by γ-aminopropyl triethoxysilane. Through the above technical scheme, the problem of poor adhesion strength between the waterproof board and the polyurethane in the composite board and poor flame-retardant performance of the waterproof composite board in the prior art is solved.

The invention discloses fibroin-based hydrogel for adhesion and a preparation method thereof, and relates to the technical field of biomedical materials. Comprising the following steps: 1) mixing glycidyl methacrylate and a silk fibroin solution, then heating to chemically modify silk fibroin, and finally dialyzing and purifying to obtain a modified silk fibroin solution; and 2) mixing the silk fibroin solution modified in the step 1) with an acrylic monomer and an initiator, and then carrying out photopolymerization treatment. The tensile strength of the prepared fibroin-based hydrogel for adhesion is 70-310 kPa, the tensile elongation at break is 250%-450%, and the shear adhesive strength to tissues is 20-80 kPa. Compared with the traditional hydrogel, the fibroin-based hydrogel for adhesion prepared by the invention has excellent adhesion, biodegradability and conductivity, and has remarkable advantages in the aspects of wound tissue sealing and wearable and implantable electronic equipment.

The invention concerns a composition comprising a fluoropolymer, a silicon-sulfur compound, a vinyl polymer consisting in carbon and hydrogen atoms, and optionally oxygen and / or nitrogen atoms, and a solvent or a mixture of solvents and methods for the preparation thereof and for preparing a coated substrate by applying said composition.

The invention discloses an epoxy composite coating with radiation attenuation performance and a preparation method thereof. The preparation process of the composite coating comprises the following steps: firstly, preparing a core-shell structure anti-radiation filler of a silicon dioxide shell layer through auxiliary ball milling of tetraethoxysilane, and then preparing a modified anti-radiation filler through further surface treatment of gamma-aminopropyltriethoxysilane (KH550); and finally, mixing the modified filler with epoxy resin to obtain the epoxy composite coating with the radiation shielding performance. The prepared composite coating has good thermal stability and adhesive strength, has excellent X / gamma ray attenuation performance and can be used for radiation attenuation of the surface of metal equipment.

The invention discloses an adjustable numerical control flame cutting machine, and relates to the field of flame cutting machines, the adjustable numerical control flame cutting machine comprises a supporting table, supporting plates are arranged on the supporting table, each supporting plate can move in the vertical direction, a starting part is arranged on one side of a sliding table, and when a cutting structure moves, under the cooperation of the starting part, the cutting structure can move in the vertical direction. A supporting plate located below a cutting torch of the cutting mechanism moves downwards, so that the supporting plate is far away from the plate to form a gap; the sliding table moves to trigger the supporting plate below the cutting area to automatically move downwards, so that a certain gap is formed between the supporting plate and a plate, slag cannot make contact with the surface of the supporting plate immediately, the slag can make contact with the supporting rack only after falling by a certain distance, the adhesion strength of the slag is remarkably reduced, adhesion cannot be too tight even if adhesion is conducted, later-period removal is easy, and the service life of the plate is prolonged. Meanwhile, only the supporting plate below the current cutting position is subjected to avoiding operation, frequent lifting of irrelevant areas is avoided, the supporting plate is protected, and the service life of equipment is prolonged.

The invention relates to a measuring device (22) for inline measurement of the adhesion strength of a coating (16) of an electrode (12), comprising two deflecting rollers (28) and a measuring roller (30), which are aligned with their respective central axes parallel to each other, wherein the measuring roller (30) is configured to be moved in a lateral direction (32) perpendicular to a longitudinal extension direction of the central axes relative to the deflecting rollers (28), wherein the deflecting rollers (28) are configured to be positioned against the same side of the electrode (12) and the measuring roller (30) is configured to be positioned against the other side of the electrode (12), whereby by moving the measuring roller (30) the electrode (12) can be positioned around the measuring roller (30), whereby the electrode (12) has a bend in a test area defined by a radius of the measuring roller (30), and comprising an optical defect detection device (34).which is designed to optically detect and evaluate the area of ​​the electrode (12) to be tested.