Used Co Rotate Extruder for sale (33,792)

Condition: new, Year of construction: 2025, Extraction floor, waffle floor for mineral blasting media, approx. 7000x4200mm, without grating cover, with suction nozzle and collection boxes. Cgedpsdz Ayvsfx Ahkew For questions regarding technical specifications, etc., please contact us in writing or by telephone. The machines are based on production at the Grossenlueder site, which has been ongoing since 1971. Harth & Seifert - Georg Fischer - Schiffmann and Seidl - Oliver Fritz GmbH & Co. KG, with their long-standing and well-known contact persons.

Condition: new, Year of construction: 2025, sandblasting containers allow flexible blasting in closed Csdofin Iyepfx Ahkjgw rooms at any location where it is required. 5,89 x 2,35 x 2,69 m A closed sandblasting grit circulation using an integrated flat conveyor or screw conveyor floor, or via side-mounted recirculation channels, with optimal preparation of each blasting grit, ensures effective exploitation of the grit.Depending on the container size and required area output, one or more free jet pressure blowers can be used. The blasting nozzles of our tried and tested free jet pressure blowers are manually guided. Our free jet pressure blowers can be fitted with an automatic refilling system to ensure continuous operation without interruption for the blaster.

Condition: new, Year of construction: 2025, Injector gravitational tumble belt blasting system for blasting series parts with glass beads, corundum, ceramic balls, etc. Due to the gravitational system, the system has 15-20% more blasting power than a simple injector blasting system. The system has a bucket elevator with wind sifting for cleaning the blasting agent. It is possible to store up to 20 programs for various blasting tasks. Cgedpfohunz Nsx Ahkjw

Condition: new, Year of construction: 2025, Centrifugal wheel rotating table system D = 1500 mm, 2 x 7.5 kW centrifugal wheels Csdpedtq Anjfx Ahksgw If you have any questions regarding technical specifications, etc., please contact us in writing or by phone. The machines are based on manufacturing at the Grossenlueder site, which has been in operation since 1971. Harth & Seifert - Georg Fischer - Schiffmann und Seidl - Oliver Fritz GmbH & Co. KG, with their long-standing and well-known contact persons.

Condition: new, Year of construction: 2025, Abrasive blasting cabinet DSK 1102 S with trolley and rotary table. Cjdpjdhl Ngjfx Ahkogw Width: 1500mm, Depth: 1235mm, Height: 995mm Lift-up door, pneumatic. If you have any questions regarding technical specifications, etc., please contact us in writing or by telephone. The machines are based on manufacturing at the Grossenlueder location, which has been ongoing since 1971. Harth & Seifert - Georg Fischer - Schiffmann und Seidl - Oliver Fritz GmbH & Co. KG, with its long-standing and well-known contact persons.

Year of construction: 2025, condition: new, Maintenance-friendly dedusting system specially developed for aggressive sandblasting dusts with pre-chamber impact separator, complete essentially consisting of: a) 1 cartridge dry filter, type PF 1.4.B62.00 5000m³/h (other sizes available) each consisting of a stable, vacuum-tight 3 mm sheet steel housing, divided into the raw gas chamber with filter cartridges, filter pre-chamber impact separator and clean gas chamber with filter cleaning by means of compressed air, each with separate Easy Open maintenance door. Dust collection hopper with slotted valve for dust disposal using big bags. Cjdpfx Aew Ivr Dohkegw Solenoid valve control with differential pressure display for optimum adjustment of the filter cartridges - cleaning. Maintenance doors as swing doors Maintenance easy.

Condition: new, Year of construction: 2025, functionality: fully functional, Blasting container for blasting with glass beads, ceramics, corundum, hard cast gravel, garnet sand, etc. Blasting container with full-surface screw conveyor floor and real blasting agent preparation. No sweeping, vacuuming and shoveling of abrasive in the blast room during the blasting of your workpieces thanks to our circulation system. Blast media cleaner air separator 4-fold adjustable air volume/ flow speed/ suction proximity to the blast media/ blast media layer height adjustment. Electric vibrating screen for permanent coarse separation. Bucket elevator with trapezoidal threaded spindle for belt tensioning and speed monitoring. Container lining with a 70shore 4mm fabric rubber for a service life of up to 30 years with proper use. Container can be opened completely to the side for easy forklift loading. Container can be upgraded with a crane overhead hatch, floor reinforcement, lateral blast room extension. When blasting stainless steel, the container can be upgraded with a real magnetic drawer or a magnetic drum separator as well as stainless steel grating. Filter system with easy maintenance doors, big bag dust bagging, H13/14 secondary filter and silencer. Blast pot with pressure regulator and water separator. The container is characterized by its reliability and easy maintenance. All system components are easily accessible at the rear of the container. Only 4 ball bearings on the screw conveyor floor and 4 ball bearings on the bucket elevator. Cjdpfxouwlzye Ahkegw Special warranty of 5 years on the essential parts of the blasting system included. Safety equipment: Door/gate limit switch, dead man's control, emergency lighting, blast room viewing window, emergency stop in the blast room and on the outside of the control cabinet, pressure vessel quick ventilation

Condition: new, Year of construction: 2025, sandblasting containers allow flexible blasting in closed rooms at any location where it is required. 8,89 x 2,35 x 2,69 m A closed sandblasting grit circulation using an integrated flat conveyor or screw conveyor floor, or via side-mounted recirculation channels, with optimal preparation of each blasting grit, ensures effective Cedsfnh Rwspfx Ahkjgw exploitation of the grit.Depending on the container size and required area output, one or more free jet pressure blowers can be used. The blasting nozzles of our tried and tested free jet pressure blowers are manually guided. Our free jet pressure blowers can be fitted with an automatic refilling system to ensure continuous operation without interruption for the blaster.

Condition: new, Year of construction: 2025, sandblasting containers allow flexible blasting in closed with extension modules each 1m Cgedpfx Aofnh Rzehkjw rooms at any location where it is required. 6,60 x 2,99 x 3,5 m A closed sandblasting grit circulation using an integrated flat conveyor or screw conveyor floor, or via side-mounted recirculation channels, with optimal preparation of each blasting grit, ensures effective exploitation of the grit.Depending on the container size and required area output, one or more free jet pressure blowers can be used. The blasting nozzles of our tried and tested free jet pressure blowers are manually guided. Our free jet pressure blowers can be fitted with an automatic refilling system to ensure continuous operation without interruption for the blaster.

Condition: new, Year of construction: 2025, Trough belt, impeller wheel, shot blasting system, 11 kW, directly driven impeller turbine with 8 throwing blades. Belt width 1000 mm and diameter 900 mm. Cgsdpjhvikusfx Ahkew

Condition: new, Year of construction: 2025, Container shot blasting system. 5.89 x 2.35 x 2.69 m Container shot blasting systems with integrated machine room. Flat conveyor bed, screw conveyor bed, bucket elevator, processing unit, pressure blasting pot (100 l), filter system, extraction bed, opening designed as a manual blasting booth. For questions regarding technical specifications, etc., please contact us in writing or by phone. The basis for these machines is manufacturing at the Grossenlüder location, which has been ongoing since 1971. Harth & Seifert - Georg Fischer - Schiffmann und Seidl - Oliver Fritz GmbH & Co. KG, with their long-standing and well-known contacts. Images may include optional accessories. Codsdkbvcopfx Ahkjgw

Condition: new, Year of construction: 2025, Blasting container with overhead crane, HC 20 ft. Includes screw conveyor base, bucket elevator, air separator, vibrating screen, blasting media hopper, blasting unit with accessories, extraction hood for blasting media recovery, filter system with pre-separation chamber, 4mm woven rubber lining, lighting, emergency lighting, door switch, viewing window, Siemens Logo electrical control system, 500kg overhead crane with structural calculations and initial inspection, CE marking with operating manual. Cgjdpfx Aeiqnrvohkew

Condition: new, Year of construction: 2025, Shot blasting chamber, 12x5 m, with shot blasting carriage and flat conveying system. Flat conveying system, screw conveyor, bucket elevator, magnetic separator, processing equipment, material hopper, shot media refilling system, free-jet pressure blasting unit, filter system with cleaning function. Walls lined with 4 mm woven rubber. For questions regarding technical specifications, etc., please contact us in writing or by telephone. The machines are based on manufacturing at the Grossenlueder location, which has been ongoing since 1971. Harth & Seifert - Georg Fischer - Schiffmann und Seidl - Oliver Fritz GmbH & Co. KG, with its long-standing and well-known contacts. Cedpfx Ajdhlikohkegw

Condition: new, Year of construction: 2025, Pressure blasting cabinet DSK 11.11.30. Blasting chamber: W=1050mm, D=1050mm, H=955mm. 1 TÜV-certified pressure vessel, 30 liters, with conical discharge hopper. 1 abrasive metering valve with pneumatic control for abrasive flow rate adjustment. 1 integrated shut-off cone with guide tube. 1 compressed air connection with pneumatic shut-off valve and branch for control air. 1 pressure regulator for adjusting the blasting pressure. 1 blasting hose DN19. 1 handpiece with boron carbide blasting nozzle, Venturi 8mm. 1 pair of blasting gloves. Electric height adjustment of the cabinet for ergonomic working posture. Memory function to save 3 height positions. Dust extraction filter, 2000 m³/h, 2.2 kW. Codpjga Ehbofx Ahksgw

Condition: new, Year of construction: 2025, Maintenance-friendly dedusting system specially developed for aggressive sandblasting dusts with pre-chamber impact separator, complete essentially consisting of: a) 1 cartridge dry filter, type PF 1.4.B62.00 5000m³/h (other sizes available) each consisting of a stable, vacuum-tight 3 mm sheet steel housing, divided into the raw gas chamber with filter cartridges, filter pre-chamber impact separator and clean gas chamber with filter cleaning by means of compressed air, each with separate Easy Open maintenance door. Dust collection hopper with slotted valve for dust disposal using big bags. Solenoid valve control with differential pressure display for optimum adjustment of the filter cartridges - cleaning. Csdpfx Aow Ivrkehkogw Maintenance doors as swing doors Maintenance easy.

Condition: new, Year of construction: 2025, Dedusting system with pre-chamber separator specially developed for aggressive sandblasting dusts, complete essentially consisting of: a) 1 cartridge dry filter, type PF 1.16.B250 15,000m³ (other sizes available) each consisting of a stable, vacuum-tight 3 mm sheet steel housing, divided into the raw gas compartment with filter cartridges and clean gas compartment with filter cleaning by means of compressed air, each with separate maintenance doors that are easy to open. Dust collection hopper with slotted valve for dust disposal using big bags. Solenoid valve control with differential pressure display for optimum adjustment of the 16 filter cartridges - cleaning. Technical data, approx. Type PF 1.16.B250 W x D x H 1.6 x 1.9 x 4.2m Cgjdpfx Asw Ivrwohkew Air flow rate 15000 cbm/h Filter cartridges 16x 15,6m² Filter area 249.6 m² Filter medium PE fiber fleece Residual dust content 99.9%

Condition: new, Year of construction: 2025, Dedusting system with pre-chamber separator specially developed for aggressive sandblasting dusts, complete essentially consisting of: a) 1 cartridge dry filter, type PF 1.16.B250 15,000m³ (other sizes available) each consisting of a stable, vacuum-tight 3 mm sheet steel housing, divided into the raw gas compartment with filter cartridges and clean gas compartment with filter cleaning by means of compressed air, each with separate maintenance doors that are easy to open. Dust collection hopper with slotted valve for dust disposal using big bags. Solenoid valve control with differential pressure display for optimum adjustment of the 16 filter cartridges - cleaning. Technical data, approx. Type PF 1.16.B250 W x D x H 1.6 x 1.9 x 4.2m Codpfx Asrt H Izohkogw Air flow rate 15000 cbm/h Filter cartridges 16x 15,6m² Filter area 249.6 m² Filter medium PE fiber fleece Residual dust content 99.9%

Condition: new, Year of construction: 2025, 2 high-performance impeller wheels, Ø380, 11 kW each. Our impeller wheel is characterized by its high flexibility due to its ability to rotate both clockwise and counterclockwise. Our two-disc turbine ensures a stronger, more concentrated hot spot and more efficient blasting. Replacing the 8 impeller blades and the internal lining is easy and can be done without special tools or the need to disassemble the turbine wheel. All wear parts are made of high-quality materials for a long service life. A mechanical pre-acceleration of the abrasive ensures optimal utilization of the energy used. It also forms the heart of the blasting system: the efficiency and economy of the blasting system are decisively influenced by the efficiency of the impeller wheel. The impeller wheel is directly driven and, depending on the diameter, is equipped with 4-8 blades (Ø240, 4 pieces; Ø380-500, 8 pieces). High efficiency and maximum utilization of the energy used are thus guaranteed at all times. We will be happy to advise you! Cgjdpfx Ahohvmkxeksw

Condition: new, Year of construction: 2025, functionality: fully functional, pressure: 6 bar, warranty duration: 60 months, inner dimension width: 4,000 mm, inner dimension length: 6,000 mm, inner dimension height: 3,000 mm, filter area: 99 m², volume flow: 7 m³/h, Equipment: documentation/manual, lighting, Blasting house for all blasting media made of a steel construction/isopanels with filter system, air circulation system, blasting media preparation, pressure blasting pot 200l automatically refilling, blasting hose with dead man's control, breathing air system, LED lighting, wall cladding 70shore 4mm fabric rubber, sweep pit bucket elevator. Blast media recirculation via sweeping pit with bucket elevator can be upgraded to cross conveyor screw with dosing hood across the entire width as sweeping pit or complete flat conveyor floor. Workpiece transport can be retrofitted: blasting carriage with track bed, crane system, crane roof opening, etc. Csdpfxju A A Tkj Ahksgw For glass bead blasting for stainless steel, can be upgraded with the correct magnetic drawer or electrically driven magnetic drum separator. When blasting with 2 different blasting media (ferritic and mineral), upgradeable with magnetic drum separator, final magnetization stage and second air separator for blasting media separation, cleaning. Safety equipment: Emergency lighting battery, emergency stop switch in the cabin and outside, viewing window to the blasting chamber, door/door limit switch, dead man's control, pressure vessel quick venting Warranty up to 5 years on various components. 50 years of experience and more than 3000 systems in blasting machine construction

Condition: new, Year of construction: 2025, Shot blasting booth with blasting carriage and rotary table for components with a diameter of up to D = 900 mm and a height of 400 mm. Aspiration system for abrasive media with cyclone separator. Extra sound insulation and an inner lining made of rubber with fabric insert. High-quality machine for continuous use in trade and industry. Rotary table with rotary drive, D = 800 mm, for heavy components up to 800 kg. Pneumatic lift-up door. Filtration system with pneumatic cartridge cleaning and dust filter for air discharge into the building. Cgjdpfx Ahjd Sl Dboksw For questions regarding technical specifications, etc., please contact us in writing or by telephone.

Year of construction: 2025, condition: new, Maintenance-friendly dedusting system specially developed for aggressive sandblasting dusts with pre-chamber impact separator, complete essentially consisting of: a) 1 cartridge dry filter, type PF 1.4.B62.00 5000m³/h (other sizes available) each consisting of a stable, vacuum-tight 3 mm sheet steel housing, divided into the raw gas chamber with filter cartridges, filter pre-chamber impact separator and clean gas chamber with filter cleaning by means of compressed air, each with separate Easy Open maintenance door. Dust collection hopper with slotted valve for dust disposal using big bags. Solenoid valve control with differential pressure display for optimum adjustment of the filter cartridges - cleaning. Cgodpfxolxyhfs Ahkow Maintenance doors as swing doors Maintenance easy.

Condition: excellent (used), Year of construction: 2017, operating hours: 1,50,050 h, functionality: fully functional, controller manufacturer: Heidenhain, controller model: iTNC530, rotary table diameter: 500 mm, overall weight: 13,000 kg, spindle speed (max.): 14,000 rpm, operating hours of spindle: 6,950 h, coolant supply: 20 bar, spindle nose: HSK 63, number of slots in tool magazine: 60, Equipment: chip conveyor, oil mist separator, rotational speed infinitely variable, • Condition: Excellent condition • Operating hours: 6,950 • KESSLER rotary table, Ø 500 mm • Tool magazine: 60 stations, HSK-A63 • Internal coolant supply: 20 bar, with band filter system • Coolant system: Automatic coolant level monitoring • Air through spindle • Tool measurement: BLUM laser tool measuring system • Workpiece measurement: Infrared workpiece probing (3D touch probe system), incl. workpiece measurement preparation Cgodpfxox Hg Ibe Ahkjw • Collision monitoring: POS DCM module • Media feed: 3-channel media feed in the center of the table • Viewing: Rotary inspection window • Handwheel Please send us an inquiry directly via our website if you are interested in the machine. Due to technical reasons, direct inquiries for a quotation via third-party platforms are difficult and may be delayed.

Condition: excellent (used), Year of construction: 2023, operating hours: 421 h, functionality: fully functional, Equipment: CE marking, Multiplas V4 Injection molding Machine (new 2024) We are offering for sale a well-maintained vertical injection molding machine from 2024 which is currently being used in a clean and well maintained production facility outside of Oslo, Norway. Price: 25.000 EUR This Multiplas vertical injection molding machine ensures precise positioning, enhancing the overall quality of your products. With precise control over injection speed, pressure, and temperature, you can produce high-quality parts with tight tolerances, minimizing waste and maximizing yield. Traditional horizontal injection molding machines require significant floor space, limiting your production capacity. In contrast, vertical injection molding machines utilize vertical space efficiently, allowing you to maximize your factory's footprint. With a smaller footprint, you can optimize your layout and increase machine density. Vertical injection molding machines excel in molding complex, intricate parts with precision. Their vertical clamping and injection units facilitate seamless integration into multi-component molding processes, enabling you to manufacture diverse products with varying material properties. General information: • Manufacturer: Multiplas Enginery Co. LTD • Model: Multiplas V4, V2C-50T • Serial number: on request • Year of manufacturing: 2023, delivered 2024 • Operating hours: 421 • Dimensions (L/W/H): 2,3 x 1,5 x 3.7 m • Weight: 3,4 ton • Functionality: fully operational • Condition: very well maintained Extras: Cgjdpsw S Ewqsfx Ahksw • TPU Screw and barrel • CE Certificate • Color RAL 9002 • 400V Transformer • Installation guide • Machine Manual Machine Specifications: • Screw diameter: 35 mm • Theoretical Injection Volume: 154 cm3 • Injection Capacity (PVC): 145 gm • Injection Pressure: 1383 kg/cm2 • Injection Rate: 69cm3/sec • Plasticizing Capacity (PVC): 53 kg/hr • Screw Rotation speed: 186 r.p.m. • Heater Capacity: 3,9 kw • Clamping Force: 55 ton • Min. mold Thickness: 350 mm • Opening Stroke: 300 mm • Max. opening Thickness: 650 mm • Ejector power: 1,8 ton • Electrical Power: 10/7,5 hp/kw • Oil tank Capacity: 160 L • Cooling water Capacity: 230 l/hr • Machine size: 2,3 x 1,5 x 3,7 m • Machine weight: 3,4 ton Can be viewed on site. More pictures and videos can be sent to interested buyers. The machine is ready to be sold immediately.

Condition: used, functionality: fully functional, machine/vehicle number: 106341-11, Year of construction: 2005, overall weight: 8,000 kg, total height: 2,700 mm, total length: 5,660 mm, total width: 3,956 mm, The drilling method of the deep hole drilling machine is single-lip drill deep hole drilling. Drilling Unit Information: - Number of spindles: 1 - Infinitely variable spindle speed: 300 – 8000 rpm - Spindle drive power: 7.5 kW - Max. drilling depth: 800 mm - Drilling diameter min/max: 3 – 25 mm based on ST 60 - Max. twist drilling: 25 mm - Max. thread tapping: M24x3 - Milling material removal rate: 150 cm³/min Travel Paths: - X-axis travel: 800 mm - Y-axis travel: 400 mm - Z-axis travel: 630 mm - W-axis travel: 800 mm Travel Speed: - X-axis speed: 15,000 mm/min - Y-axis speed: 15,000 mm/min - Z-axis speed: 15,000 mm/min - W-axis speed: 15,000 mm/min Fluid Information: - Coolant supply: deep hole drilling oil - Tank capacity: 800 liters - 1x scraper belt chip conveyor - 1x hydraulic unit and pneumatic system/equipment - 1x submersible pump: Pumping capacity: 200 l/min - 1x low pressure pump: Pumping capacity: 100 l/min Pump drive: 1.7 kW - 1x compact belt filter: Filtration capacity: 120 l/min for processing steel/non-ferrous metals - 1x radial piston pump with remote adjustment: Pumping capacity: 2 – 94 l/min Codpfsw E H E Rsx Ahkogw Pump drive: 7.5 kW Spindle Unit: - Cartridge spindle design with drive housing and spindle drive with gearbox. Spindle bearing with precision angular contact ball bearings and lifetime grease lubrication. Milling and Drilling Spindle Unit: - For conventional machining - Spindle head with HSK 50 tool holder Drill Bush Holder: - Design as 2-position turret with electric swivel mechanism - Locating position via Hirth coupling - Turret head with fixtures for: Guide bushes for deep hole drilling Milling and drilling spindle unit for conventional machining Pickup Tool Changer: - For conventional tools and drill bushings - Disc magazine design with 20 stations including feed stroke Automatic Tool Changer for Deep Hole Drilling Tools: - Fixed ELB column magazine for at least 5 tools including automatic tool clamping for HSK holders Clamping Table with W-Axis and NC Rotary Table: - Length/width: 800 x 600 mm - Positioning accuracy: B-axis +/- 30" - Centric payload: 1,500 daN Workpiece Clamping Device: - 1x tailstock with manual clamping movement - 1x NC dividing unit (A-axis) with manually operated two-jaw chuck for workpiece clamping - 1x base plate for mounting and clamping drill bushings + supporting prisms Electrical Equipment Information: - 1x CNC control Sinumerik 840D (digital complete system), including PLC S7-300 Connection Data: - Operating voltage: 3AC 400V ±10% – Frequency: 50 Hz - Control voltage: 24 V DC - Total connected load: 25 kW

Condition: used, Year of construction: 2011, functionality: fully functional, machine/vehicle number: 106546-11, total height: 3,550 mm, total length: 7,185 mm, total width: 4,720 mm, overall weight: 8,000 kg, The drilling method used by the deep hole drilling machine is single-lip gun drilling. Drilling Unit Information: - Number of spindles: 1 - Spindle speed, infinitely variable: 500 - 8,000 rpm - Spindle drive power: 11 kW at 60% duty cycle - Max. drilling depth: 1,000 mm (in one pass, no retraction required) - Drilling diameter: 3 - 35 mm (based on ST 60) - Drilling diameter / indexable inserts: 40 mm - Max. thread cutting: M27 - Milling material removal rate: 250 ccm/min Travel Paths: - X-axis travel: 1,050 mm - Y-axis travel: 600 mm - Z-axis travel: 800 mm - W-axis travel: 1,250 mm (with 2 steadies) Traverse Speeds: - X-axis speed: 15,000 mm/min - Y-axis speed: 15,000 mm/min - Z-axis speed: 15,000 mm/min - W-axis speed: 15,000 mm/min Fluid System Information: - Coolant supply: deep drilling oil - Tank capacity: 1,200 liters - 1 x scraper-belt chip conveyor - 1 x screw conveyor system - 1 x hydraulic unit and pneumatic unit/equipment - 1 x central lubrication system - 1 x submersible pump: Codpfjxdm Awex Ahkegw Pump delivery: 200 l/min - 1 x low-pressure pump: Pump delivery: 100 l/min Drive power: 2.2 kW - 1 x compact band filter: Filtration rate: 175 l/min For machining steel and non-ferrous metals - 1 x radial piston pump with remote adjustment: Delivery rate: 2 - 120 l/min Pump drive: 11 kW - 1 x air cooler (heat exchanger): 22.5 kW - 1 x oil mist extraction unit: Extraction capacity: 1,250 m³/h Milling and Drilling Spindle Unit: - For conventional machining - Spindle head with tool holder SK 40 Tool Changer Magazine comprising: - Tool magazine with intermediate gripper - Tool holder SK 40 - Max. permitted tool diameter: 80 mm - Max. permitted tool length: 250 mm - Number of tool storage positions: 80 - 2 x swiveling tool steady rests for guiding and supporting long drilling tools, with automatic positioning to home position. Clamping Table with B-Axis and NC Rotary Table: - Length / width: 800 x 600 mm - B-axis: 360° - Positioning accuracy, B-axis: +/- 30 seconds - Table travel: 800 mm - Payload (centered): 1,500 daN Electrical Equipment Information: - 1 x CNC control system, Heidenhain iTNC 530 - 1 x drilling process monitoring - 1 x RENISHAW touch probe Connection Data: - Operating voltage: 3AC 400V ± 10% - Frequency: 50 Hz - Control voltage: 24 V DC - Total connected load: 26 kW