Used Rotary Die-Cutting Machine for sale (70,337)

Condition: excellent (used), functionality: fully functional, Year of construction: 2019, operating hours: 21,158 h, machine/vehicle number: A0217E0103, control type: NC control, degree of automation: automatic, actuation type: electric, laser type: fiber laser, laser hours: 21,158 h, laser power: 2,000 W, sheet thickness (max.): 16 mm, sheet thickness steel (max.): 16 mm, sheet thickness stainless steel (max.): 8 mm, sheet thickness aluminum (max.): 6 mm, table length: 3,000 mm, table width: 1,500 mm, Equipment: centralized greasing system, cooling unit, dust extraction, emergency stop, fume extraction, safety light barrier, The showcased laser cutting machine is in very good technical condition. It has been used exclusively in our production facility since new. The machine is currently in operation, so it can be demonstrated while running without any issues. It has been regularly serviced by qualified technicians and cleaned of current contaminants. The offered laser cutter is ready for immediate use and reports no errors or faults. Iedpfx Asy Sgmneiyjbb

Condition: like new (used), Year of construction: 2023, x-travel 4216,0 mm y-travel 2007,0 mm z-travel 305,0 mm Ibodpfx Aeyclvnoiysb control CNC table-size 4902,0 x 2134,0 mm max. workpiece weight 1465 kg / m² machine weight ab. 2500 kg total power requirement 30 kW dimensions of the machine ca. 5486,0 x 3708,0 mm The compact waterjet cutting system in bridge design consists of a torsion-resistant torsion-resistant steel construction, which is coated with a special durable anti-corrosion coating. coating. Both the two X-axes and the particularly high Y-axis are based on the Y-axis are based on the maintenance-free design specially developed by OMAX for the special requirements of a waterjet cutting system. specially developed by OMAX for the special requirements of a waterjet cutting system. Equipment: - Motorized Z-axis - Water level control - Abrasive system with AFS 1000 abrasive conveyor system - High-pressure system with special stainless steel high-pressure pipes - MAXIEM direct pump M4050 - OMAX Intelli-MAX PC control software for MAXIEM - OMAX PC control software Intelli-MAX Premium - Cutting head technology based on the A-Jet 5-axis angular cutting head - Height sensor for the A-Jet 5-axis angle cutting head - Laser pointer as a positioning aid - Automatic desludging system MBM ASAS-ME - Compressed air injection for the MBM ASAS-ME automatic desludging system - Clamping and fastening set for sheet material and material holders - Collecting grid in the cutting basin - Sensors for automatic monitoring of the cutting process - Water treatment through water conditioning incl. water analysis - Omni-Start drilling aid (Vacuum Assist) for brittle and laminated materials

Condition: good (used), functionality: fully functional, Year of construction: 2014, control type: CNC control, laser type: fiber laser, laser power: 4,000 W, sheet thickness steel (max.): 20 mm, sheet thickness aluminum (max.): 20 mm, sheet thickness copper (max.): 6 mm, workpiece weight (max.): 900 kg, Equipment: CE marking, cooling unit, documentation/manual, dust extraction, safety light barrier, CNC laser cutting system TruLaser 3030 Fiber (L49) 4000 Watt X working area max.: 3000 mm Y working area max.: 1500 mm Z working area max.: 115 mm Control system: Siemens Sinumerik 840D SL Laser power: 4000 Watt Standard equipment: Machine - Closed machine frame - Integrated cabinet with roller shutter - Automatic pallet changer in longitudinal direction - Torque drive in combination with linear direct drives - Closed beam guidance via fiber optic cable - Cooling unit - Integrated control cabinets with interior lighting - Longitudinal conveyor belt - Work area lighting - Positioning laser diode - Spray device - PierceLine - FocusLine - NitroLine - PlasmaLine - Microweld - Automatic nozzle cleaning TRUMPF Laser - Integrated solid-state laser TruDisk 3001 with 1 fiber optic cable outlet - Excitation via pump diodes - Laser power control Cutting head - Universal cutting unit - Single-cutting head strategy - Protective glass against lens contamination - Condition monitoring of the protective glass - ControlLine: Height control and sheet edge detection Control system - Simple workshop programming - Fast reproduction of parts - Control system Sinumerik 840D SL - 17" touch color screen - Integrated technology data - Automatic shutdown - Programmable cutting gas/pressure selection - FastLine - FlyLine - AdjustLine - Teleservice via the Internet Data transfer - USB interface - RJ-45 network connection Safety - CE marking - Light barriers - Multi-chamber extraction system - Compact dust extraction system - Machine cladding with certified viewing window door right Ijdpfx Aiezv Sa Ejyebb - Sliding roof + Nozzle changer

Condition: ready for operation (used), functionality: fully functional, Year of construction: 1984, machine/vehicle number: 12.873, throat depth: 300 mm, punching force: 100 t, overall weight: 2,250 kg, cutting width (max.): 600 mm, TECHNICAL DETAILS Punching force: 100 t Stroke: 300 mm Punching speed: 28 strokes/min Shearing width: 250 mm Max. sheet thickness: 16 mm Round material cutting capacity: 50 mm Cutting width: 600 mm Max. sheet thickness: 20 mm MACHINE DETAILS Control: Conventional Drive: Hydraulic Ibodszxdqujpfx Aiyjb Dimensions & Weight Dimensions (L x W x H): 1,800 x 1,250 x 2,100 mm Weight: 2,250 kg Shipping packages: 1 unit

Condition: used, functionality: fully functional, Year of construction: 2017, Used profile laser by Durma Type: HD TC 60170 IPG 2 kW Infeed and outfeed system Length: 6 meters Max diameter: 170 mm Ibedpfx Aoyykf Deiysb Year of manufacture: 2017 IPG 2 kW source Precitec cutting head

Condition: good (used), Perfecta 76 UC Paper Cutting Guillotine This machine is in very good condition. It has been in one hand since new. Technical specifications: Cutting width: 760mm Ibjdpjzv Nk Usfx Aiyob Stack height: 110mm Weight: 1650kg Power supply: 400V Equipment: – LCD programmer – photocells – air table – cutting line – hydraulic clamp with variable force adjustment – manual – tool kit – clamp plate – spare blade

Condition: used, Year of construction: 1983, Cutting length 115 cm - CNC program control - AT version (Autotrim) - Light barriers - Air table in the center Iodjz Dipqjpfx Aiyobb - Side tables with air flow - Replacement blades (sharp)

Condition: used, functionality: fully functional, machine/vehicle number: 82415, type of input current: three-phase, total width: 1,500 mm, total length: 2,500 mm, input voltage: 400 V, input current: 16 A, cutting height (max.): 100 mm, 114 A – BERGMAN & JOHANSSON 420 Bandknife Fabric Cutting Machine – Industrial Precision Cutting Unit Description For sale is a Bergman & Johansson industrial bandknife fabric cutting machine, model Type 420, manufactured in Sweden. This machine is designed for high-precision cutting of stacked textile materials using a continuous vertical bandknife system. It is a core component in professional garment cutting rooms, especially suited for detailed shaping of components such as collars, sleeves, and smaller pattern pieces. The system has been used as part of a dedicated cutting workflow together with Finn-Convey spreading tables (unit 22 C), enabling efficient transition from fabric spreading to precision cutting. The long-arm C-frame construction allows handling of large fabric stacks, while maintaining excellent control and cutting accuracy. The machine was in production use prior to factory shutdown and has been serviced on 27.02.2026. Technical Details Iodoy Au Hqspfx Aiysbb • Manufacturer: Bergman & Johansson i Borås AB, Sweden • Model: Type 420 • Band length: approx. 4200 mm • Serial number: 82415 • Machine type: Industrial bandknife fabric cutting machine Motor Specifications • Manufacturer: Leroy-Somer • Type: LS 80 P • Power: 0.75 kW • Speed: approx. 1410 rpm • Voltage: 380–400 V (3-phase, star connection) • Current: approx. 2.0 A (Y) / 3.45 A (Δ) • Frequency: 50 Hz • Protection class: IP54 Machine Features • Continuous vertical bandknife for precision cutting • Long-arm (C-frame) design for large cutting areas • Integrated cutting table with smooth surface • Adjustable blade guard for safety and accuracy • Built-in sharpening system for continuous blade maintenance • Heavy-duty industrial construction • Mobile base with wheels for flexible positioning Cutting Capabilities • High-precision cutting of multi-layer fabric stacks • Suitable for both straight and complex contour cutting • Ideal for detailed garment components and templates • Clean and accurate cuts across various textile types System Characteristics • Table-based cutting process, material is guided manually • Optional air table functionality (depending on configuration) to reduce friction • Stable blade tracking and tension system for consistent performance • Designed for continuous industrial operation Condition Used industrial condition Serviced on 27.02.2026 Machine was operational prior to factory shutdown Typical wear consistent with industrial use Inspection possible prior to dismantling Sold as-is, where-is, without warranty Applications • Precision cutting of fabric stacks • Garment component cutting • Denim and workwear production • Textile cutting rooms • Small to mid-scale production setups Location Valga, Estonia Dismantling & Transport Buyer responsible for dismantling and transport Professional dismantling recommended

Year of construction: 1985, operating hours: 75,240 h, condition: excellent (used), functionality: fully functional, machine/vehicle number: 0574 028 07, Largest sheet size: 1420 x 1020 mm Smallest sheet size: 700 x 500 mm Maximum punching force: 600 t Gripper edge: 18 – 22 mm Maximum number of cycles per hour: 6000 Processable materials: Cardboard 100 – 1000 g/m² Corrugated board F, E, B, C, F/F, F/E, F/B, E/E, E/B - Flatbed die-cutter with waste separation station, intermediate sheet insertion, and pre-stacking device, working platform, Ibjdpfszg D I Nex Aiyjb - 1 x preparation table for external tool preparation - 6 x frames for blanking dies - 6 x closing frames for die-cutting tools - 6 x tool carts

Condition: new, Year of construction: 2023, Cut-to-length slitting machine is used for longitudinal cutting of the metal sheets with maximum thickness 1mm, aluminum composite panels, paper, polycarbonate thanks to special cutting knives that are fixed on rolls of the slitting machine. Ibodjf Epzgopfx Aiysb Cut-to-length slitting machine SM 1250x8 lets you to cut the material into eight strips. The diameter of the rolls is 56 mm There are types of the sheet metal cut-to-length machines we produce: -Electric cut-to-length slitting machine SM 1250x4 (cutting for 3-4 strips) -Electric cut-to-length slitting machine SM 1250x8 (cutting for 6-10 strips) -Electric cut-to-length slitting machine SM 1250x12, SM 1250x20 (cutting for 12-20 strips) The operator of cut-to-length slitting machine can easily change the width of the strips and their numbers. There are special screws on the knives to do it. You can easily cut sheet metal right from the decoiler with our cut-to-length slitting machine. Cut-to-length slitting machine could be equipped with cross cutting knife. The machine has strong base to avoid deformation while cutting and lets to cut metal into 8 strips with the perfect quality. The cutting speed of the slitting machine is about 10 meters/minute. Cut-to-length slitting machine is electric so it doesn’t need any air or oil system to work. Electric consumption is 1.5 kW/hour. The voltage is 380V. It could be used in environment with temperature from -10 to +45 Celsius degrees. Our enterprise has started to produce this kind of cut-to-length slitting machine (slitter) since 2008 so we have great experience in doing our job and can propose great solution to your business. To get more information about the price of this slitting machine and the way it could be delivered to your location just contact us. We will give you all the information you may need. Dimension: 170.00Sm x 120.00Sm x 100.00Sm Weight: 250.00Kg Engine: 1.1-1.5 kW

Condition: used, functionality: fully functional, Used TAPER TAP MACHINE, FAMUP (SERRMAC) MDR16. TAPER TAP MACHINE, SERRMAC WITH PEDESTAL COOLING SYSTEM AND TANK, USED. Ibodpfxszht Izj Aiyeb

Condition: used, The machine has been professionally retrofitted, with an upgraded control system featuring a digital operator panel on the left side and improved safety guards, and was fully operational until a few years ago. Without nameplate or documentation. An on-site inspection is possible. Ijdpfsz Da Nbjx Aiysbb

Condition: used, Year of construction: 2021, CNC Portal Cutting Machine Manufacturer: Messer Type: MultiTherm Eco 3600 Year of manufacture: 2021 CNC control: Global Control Ibodpszyabljfx Aiyeb Track gauge: 3,600 mm Working tables: 2,300 x 6,200 mm 4 Oxy-fuel torches, type ALFA MS 4452/250 Cutting thickness: max. 150 mm Bevel cutting possible Automatic gas control (OmniFlow) for cutting oxygen (max. 15 bar) Dust extraction system: Keller dry separator, type Vario 2 Software: OmniWin2021 9926

Condition: ready for operation (used), functionality: fully functional, Year of construction: 2017, laser power: 6,000 W, CNC laser cutting machine TruLaser 3040 Fiber (L50) 6000 Watt X working area max.: 4000 mm Y working area max.: 2000 mm Ibsdpfx Aijzlpb Ssysb Z working area max.: 115 mm Control system: Siemens Sinumerik 840D SL Laser power: 6000 Watt Sheet metal thickness steel max.: 25 mm Sheet metal thickness stainless steel max.: 25 mm Sheet metal thickness aluminum max.: 20 mm Sheet metal thickness copper max.: 8 mm Standard equipment Standard features Machine - Closed machine frame - Integrated cabinet with roller shutter - Torque drive in combination with linear direct drives - Closed beam guidance via laser light cable (LLC) - Cooling unit - Integrated control cabinets with internal lighting - Automatic sheet metal changer in longitudinal direction - 19" touch color screen - Longitudinal conveyor belt - Work area lighting - Positioning laser diode - Spraying device - PierceLine - FocusLine - NitroLine - PlasmaLine - Automatic nozzle cleaning - Transport and assembly device TRUMPF Laser - Solid-state laser TruDisk 3001 with one LLC output - Excitation via pump diodes - Laser power control Cutting head - Universal cutting head - Single cutting head strategy - Protective glass against lens contamination - Condition monitoring of the protective glass - ControlLine: Height control and sheet metal edge detection Control system - SINUMERIK 840D SL control system - Simple workshop programming - TruTops Laser via network access - Fast reproduction - Integrated technology data - Automatic shutdown - Programmable cutting gas/pressure selection - ContourLine - FastLine - FlyLine - AdjustLine - Teleservice via Internet Data transfer - USB interface - RJ-45 network connection - Wireless Operation Point (basis for Visual Online Support) Safety - CE marking - Light curtains - Multi-chamber extraction system - Compact dust collection system - Machine enclosure, certified viewing window, door on the right - Sliding roof - Nozzle changer - CoolLine

Condition: used, Year of construction: 1970, functionality: fully functional, machine/vehicle number: M14L/8034, Offer Number: M14L/8034 Machinetype: thread rolling machine - flat die Info: vibratory feeder Isdpfxewi Tc Re Aiyobb Make: HILGELAND Type: TR6V Constr. year: 1970 diameter range: 10-20 mm shaft length under head: 16-180 mm max. thread length: 105 mm output pieces/min: 100 Location: In our warehouse

Condition: good (used), Paper cutting guillotine Perfecta 76 TVC Device in perfect condition, very low mileage. After general renovation in 2013. Technical data: Ibjdpfx Asztz Efsiyeb Cutting width: 760 mm Stack height: 110 mm Weight: 1650 kg Power supply: 400 V Equipment: – programmer with touch screen – photocells – air table – cutting line – chrome table surface – enlarged side tables – hydraulic clamp with smooth force regulation – instructions – full set of tools – plate for clamp – tapping block – spare knife

Condition: used, functionality: fully functional, working width: 2,100 mm, working length: 3,100 mm, Ziener oxy-fuel cutting system with Kemper extraction table 2100x3100mm and Kemper extraction unit type 810700090. The system has 3 cutting torches, is fully operational, and can be inspected under power. Iedpfxsyryrio Aiysbb

Condition: used, Year of construction: 2009, functionality: fully functional, machine/vehicle number: 9A5822, type of input current: three-phase, input voltage: 400 V, input current: 60 A, total height: 1,800 mm, cutting width (max.): 1,720 mm, cutting height (max.): 50 mm, compressed air connection: 6 bar, For sale is a Lectra Vectorfashion VT-FA-MH-71 automated CNC textile cutting system, offered as a complete industrial production line. This system is designed for high-volume, high-precision fabric cutting in garment manufacturing. It enables automated multi-layer cutting with consistent accuracy and significantly improves production efficiency compared to manual cutting processes. The machine has been operated as part of a dedicated and independent cutting line together with a GERBER SY 101 spreading system (unit 21 C) and a Gerber automatic fabric loader (unit 31 C). This configuration enables a fully synchronized workflow from roll loading to spreading and cutting, maximizing throughput and minimizing manual intervention. The system includes a long-format vacuum cutting table, gantry-mounted cutting head, and integrated extraction system. A computer-controlled interface ensures precise execution of cutting patterns and production workflows. The unit has been used in a professional garment factory and was operational prior to factory shutdown. Recently serviced on 27.02.2026. Video recorded in operation on 05.03.2026. Includes • Lectra Vector CNC cutting system • Gantry-mounted cutting head • Conveyorized cutting surface • Industrial vacuum system (approx. 30 kW class) • Dust extraction system • Computer workstation and control interface Technical Details • Manufacturer: Lectra, France • Model: VT-FA-MH-71 • Serial number: 9A5822 • Year: 2009 • Type: Automated CNC textile cutting system • Control: Computer-controlled (Lectra software environment) • Cutting method: Oscillating knife, multi-layer capable • System: Vacuum hold-down with extraction Electrical & Utility Requirements • Control cabinet: approx. 230 V, single phase • Vacuum system: approx. 400 V, 3-phase, up to 30 kW • Peak current (startup): up to approx. 60 A • Compressed air: 5–7 bar, dry and filtered • Air consumption: required for tool operation and cooling Cutting Performance • Multi-layer cutting capability (approx. 25–70 mm compressed lay height depending on material) • High acceleration and cutting speed for reduced cycle time • Repeatable precision across full table width • Continuous feeding capability for long production runs System Architecture • Gantry-driven X/Y cutting head for high-speed positioning • Vacuum table with bristle block surface for material stabilization • Conveyorized system enabling continuous material feed • Integrated extraction system for dust and fiber removal Production Advantages • Significant material savings through optimized nesting and precise cutting • Reduced labor costs compared to manual cutting processes • High throughput suitable for industrial-scale production Service & Condition Notes • Recently serviced on 27.02.2026 Iodpfx Aey Avg Ejiyebb • Video available from operation (05.03.2026) • Machine was operational prior to factory shutdown • Typical wear consistent with industrial use • Software compatibility should be verified if upgrading control workstation Condition Used industrial condition Operational prior to shutdown Sold as-is, where-is, without warranty Typical Applications • Garment production cutting rooms • Workwear and denim production • Technical textile cutting • Upholstery and automotive textiles Location Valga, Estonia Removal & Transport Buyer responsible for dismantling, loading, and transport Professional dismantling required due to system size and complexity

Year of construction: 2010, condition: ready for operation (used), Side table with air Chrome table Data numeric control is installed 2008 from Perfecta and completely overhauled Available immediately Iodpfx Aisz Aah Royobb 3 knives

Condition: used, Year of construction: 2017, table width 3000 mm table length 1500 mm burner heads 1 Plasma cutting system HEZINGER PlasmaLine EPJ / ECKERT with extraction system PFC-4 Plus 4kW F3800 Technical data HYPERTHERM Powermax 125 plasma cutting unit: Cutting capacity: Recommended: 38mm Maximum: 44mm Separating cut: 57mm Piercing: 25mm Isdpfx Asucpnloiyjbb Output current: 30-125A Mains connection: 400v-36A Compressed air requirement: 260l/min Air pressure 5.9bar Dimensions: 592 x 274 x 508 mm Weight: 49kg

Condition: excellent (used), functionality: fully functional, Year of construction: 2022, laser power: 8,000 W, Equipment: CE marking, centralized greasing system, cooling unit, documentation/manual, dust extraction, emergency stop, fume extraction, safety light barrier, fiber laser cutting machine power: 8000W table size: 4000x2000mm pallet changer Siemens controller Siemens drives THK guides Precitec Procutter auto focus torch Max Photonics resonator CE warranty Iodpfx Aezx U T Tsiyjbb offered with: warranty CAD / CAM software setup delivery (optional) training this is an exhibition machine and could be tested under power any time. please contact us

Condition: new, functionality: fully functional, Year of construction: 2026, control type: CNC control, degree of automation: semi-automatic, actuation type: electric, controller manufacturer: Bodor, laser type: fiber laser, Applicable Material: metal Condition: New Laser Type: Fiber Laser Cutting Area: 3000*1500mm Cutting Speed: 0-40000mm/min Graphic Format Supported: AI, BMP, Dst, Dwg, DXF, DXP, LAS, PLT Cutting Thickness: 0-30mm CNC or Not: Yes Cooling Mode: WATER COOLING Control Software: Bodor Pro Place of Origin: China Brand Name: Bodor Certification: CCC, CE, GS, ISO, Sgs Laser Source Brand: IPG/MAX Laser Head Brand: bodorgenius Ibjdpfog Ev T Eox Aiyeb Control System Brand: bodorpro Weight (KG): 2200 KG Key Selling Points: Tenon-and-mortise type plate welding structure bed Warranty: 3 years Laser power: 1000W Power supply: 110V/220V/380V 50Hz/60Hz

Condition: new, Year of construction: 2025, Operating Area: 3048*1524mm Iodpfxsg Rgrpo Aiysbb Machine overall dimensions: 4960×2280×2200mm Laser Output Power: IPG 3000w/2000w/1500w X/Y-axis positioning accuracy: ±0.05mm X/Y-axis repositioning accuracy: ±0.03mm X/Y-axis Max. linkage speed: 100m/min

Condition: excellent (used), functionality: fully functional, Year of construction: 2013, operating hours: 63,000 h, laser type: fiber laser, laser hours: 48,000 h, laser power: 3,000 W, Equipment: CE marking, documentation/manual, Model: TruLaser 5030 fiber (L41) Year of manufacture: 2013 A new cutting head was installed in 6/2026! Machine hours: 63,000 machine hours, 48,000 laser hours Working area: 3000 x 1500 mm Standard equipment Machine • Enclosed machine frame • Torque drive in combination with linear direct drives • Enclosed beam guidance via fiber optic cable • Machine cooling unit (water-air) • Integrated control cabinets with interior lighting • Automatic pallet changer in the longitudinal direction • Wide longitudinal conveyor belt • Power supply for TruDisk via the machine • Work area lighting • Positioning laser diode • Spray device Ibodpfxezrxdvj Aiyeb • PierceLine • FocusLine • NitroLine • PlasmaLine • Automatic nozzle cleaning TRUMPF Laser • Solid-state laser TruDisk 3001 with one fiber optic cable outlet • Fiber optic cable according to standard layout • Laser cooling unit (water-air) • Excitation via pump diodes • Laser power control • Laser logbook function Cutting head • Universal cutting head with fully adaptive lens system • Protective glass against lens contamination • Condition monitoring of the protective glass • ControlLine: Height control and sheet edge detection Control system • Control system SINUMERIK 840D SL • 17" touch color screen • Simple workshop programming • Advanced workshop programming • Fast reproduction • Integrated technology data • Automatic shutdown • FastLine • AdjustLine • Teleservice via internet data transmission • USB interface • RJ-45 network connection Safety • CE marking • Light curtains • Multi-chamber extraction system • Integrated compact dust extraction system • Fire alarm system in the compact dust extractor • Machine enclosure, certified viewing window, door on the right • Electric roll-up roof

Condition: used, Year of construction: 2015, CNC laser cutting system, fiber laser 3kW Manufacturer: Microstep Type: FIBERLAS MSF 4001.20BL Year of manufacture: 2015 With drilling unit + tool changer Complete system consisting of: - Cutting system, - IPG fiber laser source, - HIGHYAG cutting head, and - KEMPER extraction system. Laser IPG Ytterbium Laser System YLS-3000-CUT-Y14 Rated power: 3,000 W (3kW) Operating mode: CW / modulated Power consumption: approx. 9 kW max. (8.3 kW typical) at 3,000 W Cooling: IPG air-water chiller Operating hours: approx. 26,819 h Dimensions: W/D/H: 1,004 x 804 x 556 mm Cutting head II-VI HIGHYAG BIMO-FSC Ijdpszhtp Esfx Aiysbb Permissible laser power: up to 4 kW Focal length f: 150 mm (focusing module 1.5) Focus diameter: approx. 300 µm at 200 µm optical fiber Weight: approx. 6.2 kg Extraction system KEMPER SYSTEM 8000 Extraction capacity: 5,000 m³/h Filter area: 50 m² Filter: KEMPER KemTex ePTFE membrane filter Testing: IFA-tested, welding fume class W3 (high-alloy steels) Availability from 10/2026 Reference no.: C2177 9926ä