Kraussmaffei Cx250-1000 nakup rabljenega (9.586)

Stanje: novo, Leto izdelave: 2023, Funkcionalnost: popolnoma funkcionalen, številka stroja/vozila: 61037337, vpenjalna sila: 800 kN, premer vijaka: 30 mm, delovna prostornina: 113 cm³, tlak vbrizgavanja: 2.500 letvica, injekcijska masa: 103 g, minimalna višina orodja: 400 mm, izmetalna sila: 22.600 N, hod izmetalca: 150 mm, odmični hod: 900 mm, skupna dolžina: 3.960 mm, skupna širina: 1.480 mm, skupna višina: 2.020 mm, skupna masa: 3.550 kg, ogrevalna zmogljivost: 10,9 kW (14,82 KM), vrsta pogona: Hadraulisch, prosta razpetina: 470 mm, teža orodja: 1.000.000 g,

Stanje: novo, Leto izdelave: 2023, Funkcionalnost: popolnoma funkcionalen, številka stroja/vozila: 61036936, vpenjalna sila: 800 kN, premer vijaka: 35 mm, delovna prostornina: 135 cm³, tlak vbrizgavanja: 1.837 letvica, injekcijska masa: 123 g, minimalna višina orodja: 150 mm, izmetalna sila: 22.000 N, hod izmetalca: 100 mm, odmični hod: 750 mm, vgradna višina: 400 mm, skupna dolžina: 4.750 mm, skupna širina: 1.670 mm, skupna višina: 1.820 mm, skupna masa: 5.900 kg, ogrevalna zmogljivost: 8,9 kW (12,10 KM), vrsta pogona: Vollelektrisch, prosta razpetina: 470 mm, teža orodja: 600.000 g, Injection moulding machines directly from the manufacturer! As the manufacturer KraussMaffei, we offer you our tested and flexible stock machines: The base injection moulding machine, precisionMolding, is the perfect entry-level solution for all-electric injection moulding, enabling rapid and innovative responses to market requirements. It combines high performance, user-friendly operation, and short delivery times. The machine can be used across various application areas, such as the packaging industry, electrical and electronics industry, medical technology, and the automotive sector. Your benefits: – Optimised price-performance ratio for a wide range of applications – High energy efficiency thanks to the all-electric machine concept – Fast delivery times realised through basic machine concept with a broad spectrum of options TECHNICAL DATA: KM 80 / 250 PA G01 (Order 38670013) (Machine no.:61036936, new, Year 2023) CONTROL SYSTEM • MC P1 with 15" TFT colour display and multi-touch function CLAMPING UNIT • Clamping force kN 800 • Maximum mould opening force kN 120 • Daylight (h x v) mm 470 x 420 • Mounting platens (h x v) mm 610 x 560 • Minimum - maximum mould height mm 150 - 400 • Maximum opening stroke mm 750 • Maximum mould opening travel mm 350 • Ejector drive electric Gsdpfx Afeuggb Dowsub • Ejector stroke mm 100 • Ejector force forward/back kN 22 / 22 • Ejector speed forward/back mm/s 300 / 300 • Maximum mould weight kg 600 INJECTION UNIT • Screw diameter / type mm 35 / standard • Effective L/D ratio 20.0 • Injection pressure bar 1837 • Stroke volume cm³ 135 • Shot weight at max. stroke (PS) g 123 • Injection speed mm/s 200 • Injection flow rate cm³/s 192 • Screw drive / speed 1/min 382 • Plastification rate (standard screw) g/s 19.5 • Nozzle contact force kN 30 ELECTRICAL PARAMETERS • Connected load kW 17.8 • Installed heating capacity kW 8.9 • Power supply V / Hz 400 / 50, 3-phase with neutral WEIGHT AND DIMENSIONS • Net weight with control cabinet t 5.9 • Length x Width x Height m 4.75 x 1.67 x 1.82 ADDITIONAL EQUIPMENT • Wear-resistant plastification • BluePower full insulation of plastification cylinder • Open nozzle • Air valve, single (BWAP) • Pneumatic control for hot runner shut-off, single • Electrical interface (cascade), 4-fold • Electrical preparation for hydraulic auxiliary unit • Euromap interface for handling, E18, E63 • Euromap interface (central computer), E67, E77 • Water manifold, 4-fold • Automatic central lubrication • Adaptive Process Control (APC) • Injection-compression moulding function • Graphics analysis package • Swivelling device for injection unit The machine is located at our factory in Parsdorf and is available at short notice. Additional optional features can be offered on request. We look forward to your enquiry.

Stanje: novo, Leto izdelave: 2023, Funkcionalnost: popolnoma funkcionalen, številka stroja/vozila: 61036721, vpenjalna sila: 6.500 kN, premer vijaka: 70 mm, razmak između stupova: 1.110 mm, delovna prostornina: 1.078 cm³, tlak vbrizgavanja: 1.877 letvica, injekcijska masa: 981 g, odmični hod: 3.200 mm, višina plošče: 1.540 mm, vrsta pogona: Hydraulisch, prosta razpetina: 3.200 mm, teža orodja: 2.200.000 g, Injection Moulding Machines Directly from the Manufacturer! Godow U N Ixopfx Afwjub As the manufacturer KraussMaffei, we offer you our certified and versatile stock machines: The hydromechanical two-platen clamping unit of the GXW machine sets new standards in terms of quality and productivity. With the sophisticated GuideX guide shoe, forces are optimally absorbed and the service life of your molds is increased. The innovative GearX locking system engages instantly and reliably. Powerful, user-friendly, and value-retaining. TECHNICAL DATA: KM 650 / 2000 / 2000 GXW G06 (Order 38618339) CONTROL SYSTEM • MC 6 with 24" TFT color display featuring multitouch functions CLAMPING UNIT • Clamping force kN 6500 • Max. mold opening force kN 455 • Clear width (h x v) mm 1110 x 960 • Mounting platen (h x v) mm 1540 x 1440 • Mold installation height, min. - max. mm 1550 (without center plate) • Max. opening stroke mm 3200 • Max. mold opening path mm 1650 • Max. mold weight kg 22000 INJECTION UNIT 1 SP2000 • Screw diameter/type mm 60 / Thermoplastic • Effective L/D ratio 23.3 • Injection pressure bar 2420 • Shot volume cm³ 792 • Shot weight at max. stroke for PS g 720 • Injection speed mm/s 140 • Injection flow cm³/s 396 • Screw drive/rotation speed 1/min 285 • Plasticizing flow g/s 72.2 • Nozzle contact force kN 82 INJECTION UNIT 2 SP2000 • Screw diameter/type mm 70 / Thermoplastic • Effective L/D ratio 20 • Injection pressure bar 1877 • Shot volume cm³ 1078 • Shot weight at max. stroke for PS g 981 • Injection speed mm/s 140 • Injection flow cm³/s 539 • Screw drive/rotation speed 1/min 285 • Plasticizing flow g/s 98.3 • Nozzle contact force kN 82 ELECTRICAL PARAMETERS Connected load kW 341 • Power supply V/Hz 400/50 (3 phases with neutral conductor) WEIGHT AND DIMENSIONS • Net weight t 43.5 • Length x width x height m 11.89 x 3.22 x 2.77 ADDITIONAL EQUIPMENT • Wear-resistant plasticizing unit • BluePower full insulation for plasticizing cylinder • Open nozzle • BluePower ServoDrive • Pneumatic valve: 1-fold (BWAP), 1-fold (FWAP) • Pneumatic cascade valves: 6-fold (BWAP), 6-fold (FWAP) • Hydraulic core pull: 2-fold (BWAP), 2-fold (FWAP) • Mold heating: 96-fold (3.5 kW) • Euromap interface for handling: E18 • Euromap interfaces (mainframe): E67, E77, E78, E63, E82.1 • Adaptive Process Control (APC+) • Graphic analysis package • Sliding table with turning unit, servo-driven • Vertical center plate • Parallel closing and opening pressing during the injection process with parallelism control between FWAP and center plate or BWAP and center plate • ColorForm interface: signal interface for integration of an RPM system • Electrical interface for HRS Flexflow system • Electrical interface and hydraulic valves for "1-K dummy operation" • Interface for connection of a CoMo-Kistler Injection Basic System with good/bad part separation The machine is located at our Parsdorf facility and is available at short notice. Additional options can be offered on request. We look forward to your inquiry.

Stanje: dober (rabljeno), Leto izdelave: 2002, 1,0 kos rabljena brizgalna stiskalnica Proizvajalec: KRAUSS MAFFEI Tip: KM575-1900C2 Leto izdelave: 2002 Zapiralna sila: 575 ton Razmak med stebri: 1000 x 1097 mm Premer polža: 70 mm Maks. brizgalni volumen: 1.097 cm³ Teža brizganca: 998 g/PS Krmiljenje: MC4 Oprema: 5x izvlek jedra Robot, proizvajalec: Reis, leto izdelave: 2015 Gedpfx Asyak Htsfweub 24-consko upravljanje vročih kanalov Transportni trak Zaščitna ograja

Stanje: zelo dobro (rabljeno), Leto izdelave: 2012, 1 kos rabljeni stroj za brizganje plastike Proizvajalec: KRAUSS MAFFEI Tip: KM420-4300CX Letnik izdelave: 2012 Zapiralna sila: 420 ton Razmak med stebri: 800 x 800 mm Premer polža: 80 mm Maks. volumski hod: 1.810 cm³ Gusdsyak Ecopfx Afweb Teža brizganca: 1.647 g/PS Krmiljenje: MC6 Oprema: 2-kratni izmet jedra Vmesnik za robota 12-conska regulacija vročih kanalov Vmesnik za temperaturno napravo

Stanje: dober (rabljeno), Krauss-Maffei Injectioneinheit 220 (komplett) mit elektrischem Schneckenantrieb. Schneckendurchmesser 40 mm. Gujdpfofwcrnex Afwob

Stanje: skoraj kot novo (rabljeno), 300 mm thick intermediate plate for a Krauss-Maffei KM 800. Original Krauss-Maffei. Gedjh Hlr Ejpfx Afwoub

Stanje: skoraj kot novo (rabljeno), Leto izdelave: 2003, We are selling a complete Krauss-Maffei MC 4 control system, tested and fully functional! Gedpfx Afeikfmhowjub

Stanje: delavnici obnovljeno (rabljeno), Leto izdelave: 2006, 160 ton Krauss-Maffei brizgalni stroj, letnik 2006, s transportnim trakom. Premer polža 35 mm, 2 izvlečna jedra, 6 vročih kanalnih con. Stroj bo od nas dostavljen prenovljen in ga je možno pri nas prikazati v obratovanju! Gsdpoh Dh Duefx Afwoub

Stanje: delavnici obnovljeno (rabljeno), We have several Krauss-Maffei MC3 control units available, tested and in good working condition. Guedot Uzbpepfx Afwob

Stanje: skoraj kot novo (rabljeno), Leto izdelave: 2008, Horizontal injection molding machine from Krauss-Maffei with 120 tons clamping force. All-electric machine. Year of manufacture: 2008. MC5 control system. 63,000 operating hours. 40 mm screw diameter. Extras: anti-vibration plates, 8-zone flowmeter. Additional options: 1x pneumatic valve, 6 hot runner zones, Euromap 67 interface for robot connection. The machine is delivered REFURBISHED by our technical team and in optimum working condition. We can offer commissioning service at your facility. Technical Details INJECTION WEIGHT: 185 g INJECTION VOLUME: 201 ccm OPERATING HOURS: 63,000 YEAR OF MANUFACTURE: 2008 TIE BAR DISTANCE: 470x470 mm PLATEN DIMENSIONS: 780x770 mm CLAMPING FORCE: 1,200 kN INJECTION PRESSURE: 1,860 bar SCREW DIAMETER: 40 mm MINIMUM MOLD HEIGHT: 200/450 mm OPENING STROKE: 850 mm Gjdpfx Aottgybsfwjub

Stanje: skoraj kot novo (rabljeno), Leto izdelave: 2008, obratovalne ure: 6.200 h, Funkcionalnost: popolnoma funkcionalen, vpenjalna sila: 4.200 kN, premer vijaka: 75 mm, Krauss-Maffei KM 420-2000 CX Injection moulding machine from Krauss-Maffei with a 420-tonne clamping force. Only 6,000 operating hours in automatic mode. Year of manufacture: 2008. MC5 control system. Screw diameter: 75 mm. Extras include: 8 hot runner zones, 2 core pulls on the fixed platen, 2 core pulls on the moving platen, 1 pneumatic valve on the moving platen. The injection moulding machine is delivered REFURBISHED by the UK Transitus technical expert team. Commissioning at customer facilities can be offered, ensuring machine functionality upon installation completion. Technical Details Gedpfswq D Efsx Afwjub SCREW DIAMETER: 75 mm INJECTION PRESSURE: 1635 BAR INJECTION VOLUME: 1237 cm³ INJECTION WEIGHT: 1126 g MAXIMUM DISTANCE BETWEEN PLATENS: 1400 mm MINIMUM MOULD THICKNESS: 380 mm OPENING STROKE: 1020 mm TIE BAR DISTANCE: 900 x 800 mm PLATEN DIMENSIONS: 1270 x 1230 mm SCREW DIAMETER: 75 mm CLAMPING FORCE: 4200 kN YEAR OF MANUFACTURE: 2008 OPERATING HOURS: 6282

Stanje: delavnici obnovljeno (rabljeno), Leto izdelave: 2006, obratovalne ure: 60.000 h, Funkcionalnost: popolnoma funkcionalen, vpenjalna sila: 8.000 kN, premer vijaka: 85 mm, Horizontal injection moulding machine from Krauss-Maffei. 800 tons clamping force. Year of manufacture: 2006. Screw diameter: 85 mm. MC5 control system. Approximate operating hours: 60,000. The injection moulding machine is delivered RE-conditioned by our team of technical experts and in optimal working condition. We can offer commissioning service at the customer's facility, ensuring full functionality upon completion of installation. Technical Details SCREW DIAMETER: 85 mm INJECTION PRESSURE: 2242 Bar Gjdjw Avafspfx Afwjub SHOT VOLUME: 2695 cm³ INJECTION WEIGHT: 2452 g (PS) YEAR OF MANUFACTURE: 2006 OPERATING HOURS: 60,000 MIN./MAX. MOULD HEIGHT: 550 / 1100 mm MAX. DISTANCE BETWEEN PLATENS: 2100 mm OPENING STROKE: 1600 mm TIE BAR DISTANCE: 1120 x 1000 mm PLATEN DIMENSIONS: 1600 x 1530 mm CLAMPING FORCE: 8000 kN

Stanje: delavnici obnovljeno (rabljeno), Leto izdelave: 2004, Krauss-Maffei KM 650-3500 C 1 650 t Krauss-Maffei injection moulding machine, year 2004, with only approx. 45,000 operating hours in automatic mode. The machine will be delivered fully refurbished. REFURBISHED MACHINE Equipment: - 6 pneumatic cascade valves - 24 hot runner zones - 1 core puller on the fixed platen - 1 core puller on the moving platen - Electric screw drive Technical specifications: - CLAMPING FORCE: 6,500 kN - PLATEN SIZE: 1,540 x 1,440 mm - CLEARANCE BETWEEN BARS: 1,110 x 960 mm - MAX. MOULD OPENING STROKE: 1,150 mm - DAYLIGHT OPENING: 1,750 mm - SCREW DIAMETER: 90 mm - MIN. MOULD INSTALLATION HEIGHT: 600 mm - YEAR OF MANUFACTURE: 2004 - SHOT VOLUME: 1,953 cm³ Godohy Nnbepfx Afwsub - SHOT WEIGHT: 1,777 g - INJECTION PRESSURE: 1,742 bar

Stanje: rabljeno, Leto izdelave: 1999, obratovalne ure: 82.540 h, Machine de moulage par injection Krauss Maffei Modèle : KM 800-5700 MC Année : 1999 Vis : 105 mm 4 tiroirs noyau 1 électrovanne d’air AS Env. 82 540 heures de fonctionnement Hauteur d’installation : min. 600 mm, max. 1 100 mm Guedpfoyup D Hex Afweb Course d’ouverture : 1 400 mm Dimensions des plateaux : 1 300 mm x 1 300 mm Espacement entre colonnes, horizontal : 1 120 mm, vertical : 1 000 mm Bague de centrage : 250 mm 8 circuits d’eau chacun Convoyeur Carénage Système de manipulation Contrôlée et raccords de pompe étanchéifiés par KM en 2025 La machine est fonctionnelle et toujours en production Localisation : Thuringe _____ Nos conditions générales s’appliquent ; par ailleurs, le vendeur ne répond pas des erreurs de saisie ou de transmission des données. Les informations et photos ont été fournies par le propriétaire et autorisées à la publication. L’état visuel des objets proposés correspond à leur âge et aux images présentées. La technique et l’usure des objets proposés sont conformes à leur âge. Machines d’occasion vendues exclusivement à des professionnels et sans garantie.

Stanje: zelo dobro (rabljeno), Leto izdelave: 2017, obratovalne ure: 8.000 h, Funkcionalnost: popolnoma funkcionalen, številka stroja/vozila: 61029386, vpenjalna sila: 2.000 kN, premer vijaka: 70 mm, Oprema: dokumentacija / priročnik, Stroj za brizganje KraussMaffei 200/1400 CX POL BMC je naprodaj v zelo dobrem stanju. Malo delovnih ur, izdelan leta 2017, uveden v obratovanje leta 2018. Krmiljenje MC6. Za več informacij nas kontaktirajte po e-pošti! Hvala! Godpfjwz Iv Aox Afwjub

Stanje: generalkompletno obnovljen (rabljeno), Leto izdelave: 2008, Funkcionalnost: popolnoma funkcionalen, Polži ø 90-36D, 45-30D, 45-36D. Kompaktna izvedba, ena skupna elektro omarica, zmogljivost cca 800 kg/h. Gedsyilykjpfx Afwsub

Stanje: zelo dobro (rabljeno), Leto izdelave: 2010, 1 kos rabljene brizgalke za plastiko Proizvajalec: KRAUSS MAFFEI Tip: KM500-4300CX Leto izdelave: 2010 Zapiralna sila: 500 ton Razmak med stebri: 900 x 900 mm Premer polža: 90 mm Maks. volumen brizga: 2.290 cm³ Teža brizganca: 1.777 g/PS Gjdpfx Afsx Tbfuewoub Krmiljenje: MC5 Oprema: 2 x izvlek jedra Vmesnik za robota 12-conski vročekanačni regulator Vmesnik za napravo za temperiranje

Stanje: dober (rabljeno), Cevni grelec, grelni trak, grelna manšeta, sljudni grelec, ogrevanje cilindra, grelni cilinder, keramični grelni trak -Proizvajalec: Krauss Maffei, grelni trak, grelna manšeta Godpfxolvykxe Afweub -Tip: Ø200 x 160 mm .: 401 7184 -Grelna moč: 5500 W -Napetost: 230/400 V -Količina: na voljo 1x grelni trak -Cena: na kos -Dimenzije: 310/255/V160 mm -Teža: 4,0 kg

Stanje: pripravljen za uporabo (rabljen), Leto izdelave: 1997, Stock no. 13602 Manufacturer: Krauss Maffei Machine type: KM 650 – 8000 CM Year of manufacture: 1997 Operating hours: 80,000 h Control type: MC 3-F Screen language: German Location: D-52249 Eschweiler Clamping Unit: Clamping force: 6,500 kN Maximum mold opening force: 346 kN Moving platen opening force: 169 kN Moving platen closing force: 144 kN Mounting platen size (H x V): 1,704 x 1,700 mm Clear distance (H x V): 930 x 930 mm Mold opening stroke: 1,150 mm Minimum mold installation height: 600 mm Maximum opening width: 1,750 mm Ejector stroke: 250 mm Ejector force fwd/rev: 226 kN Injection Unit: Screw diameter: 130 mm L/D ratio: 20 Injection pressure: 1,296 bar Stroke volume: 6,172 ccm Shot weight (PS): 5,617 g Injection flow rate: 1,540 ccm/s Gsdpsub S R Hjfx Afwoub Screw speed: 138 rpm Plasticizing throughput: 238 g/s Nozzle contact force: 246 kN Electrohydraulic Equipment: Pump motor rated power: 132 kW Installed heating capacity: 70 kW Cylinder heating control zones: 7 Dimensions and Weights: Space requirement approx.: 12.00 x 2.80 x 2.70 m Total weight: 43,000 kg Accessories: - Vibration damping elements Additional Equipment: - 1 x air valve - 2 x hydraulic core pulls on BFAP - 2 x hydraulic core pulls on FFAP - 8 x hot runner controllers - Robot interface according to Euromap 67

Stanje: pripravljen za uporabo (rabljen), Rabljeni stroj Brizgalni stroj Proizvajalec: Krauss Maffei KM 80 C1 Letnik: 2000 Na zalogi je le še 1 stroj Ni dobavnega roka, takoj dobavljivo Ogled možen po predhodnem dogovoru Stroj ni več priključen na elektriko / noben priključek za hladilno vodo Stroj je strokovno uskladiščen Gusdpfx Afju Ti Srswsb Tehnični podatki: Zapiralna sila (kN): 800 kN Pritrdilna plošča (mm): 610×610 Razdalja med stebri (mm): Vgradna višina (mm): 250 Odprtina med ploščami (mm): 750 Krmiljenje: MC4 Zaslon v nemškem jeziku (ni mogoče spremeniti v druge jezike) Brizgalna enota Premer polža (mm): 45 Brizgalni tlak (bar): 1878 Prostornina hoda (cm³): 275 Moč pogona črpalke (kW): 18,5 Grejna moč (kW): 13 Polnjenje olja (l): 270 Dimenzije (m): 4,3 x 1,4 x 2,1 Skupna masa: 3,2 t Dodatne fotografije na zahtevo.

Leto izdelave: 2002, stanje: pripravljen za uporabo (rabljen), Clamping force: 2500 kN, clear tie bar spacing: 630 mm/630 mm, opening stroke: 1150 mm, minimum mold installation height: 330 mm, screw diameter: 60 mm, specific injection pressure: 2000 bar, max. shot volume: 670 cm³, connected load: 74 kW, control system: MC4. Machine dimensions: 5700 mm / 2200 mm / 2300 mm, machine weight: 12.5 t, operating hours: 47,572 h. Available from February 2025, including special accessories: Krauss Maffei LRX-S 100, 8 hot runner controllers, 4 core pulls, blow-out unit, pressure accumulator, hydraulic tie bar withdrawal device, energy saving mode, ALS interface, 20 mA interface, and color dosing device interface. On-site inspection possible, documentation available. Gujdpfxouiykdo Afwjb

Leto izdelave: 2002, stanje: pripravljen za uporabo (rabljen), A large-format Krauss-Maffei injection molding machine without robot, conveying equipment, safety enclosure, or attachments is available. Clamping force: 1300t, injection volume: approx. 8000cm³. Overall system dimensions X/Y/Z: approx. 13000mm/3550mm/2850mm, machine weight: approx. 83,000kg, operating hours: 73,259h, production hours: 57,753h. Documentation available. On-site inspection possible. Expected to be available from Q1/2026. Gsdpfxjwut Hys Afwsub

Leto izdelave: 2000, stanje: pripravljen za uporabo (rabljen), Two Krauss Maffei injection molding machines are available: 1) Krauss Maffei KM 50 C1, year of manufacture: 1999, injection unit: SP220, screw diameter: 30 mm, L/D ratio: 23, injection pressure: 2500 bar, shot volume: 85 cm³, machine dimensions (L/W/H): approx. 3200 mm / 1350 mm / 1800 mm, weight: approx. 2500 kg, control system: MC4, operating hours: approx. 86,000 h. 2) Krauss Maffei KM 125 C1, year of manufacture: 2000, injection unit: SP520, screw diameter: 45 mm, L/D ratio: 20, injection pressure: 1878 bar, shot volume: 217 cm³, machine dimensions (L/W/H): approx. 4500 mm / 1550 mm / 2200 mm, weight: approx. 5500 kg, control system: MC4, operating hours: approx. 82,000 h. Gujdpfxjw Emybs Afwjb Documentation is available. Inspection on site is possible.

Leto izdelave: 2005, stanje: pripravljen za uporabo (rabljen), Flange diameter: 160 mm, clamping force: 1600 kN, tie bar distance: 520 mm/520 mm, minimum mould diameter: 350 mm, minimum mould installation height: 300 mm, opening stroke: 650 mm, platen distance: 950 mm, ejector stroke: 150 mm. Screw diameter: 45 mm, injection pressure: 2336 bar, stroke volume: 318 cm³, nozzle radius: 15 mm, shot volume: 134 cm³, shot weight: 289 g. Machine dimensions (L/W/H): approx. 4900 mm/1600 mm/2200 mm, weight: approx. 7400 kg, operating hours: approx. 71,187 h. The machine has an unknown defect. Documentation is available. On-site inspection is possible. Guodpfeuabq Tsx Afwsb