Arburg Allrounder 570 S 1600 - 290 nakup rabljenega (84.543)

Stanje: zelo dobro (rabljeno), Leto izdelave: 2012, Arburg 520S 1600-400/170 e² / Production Line with Geiger Robot Year of manufacture: 2012 Injection Unit: Screw diameter: 35 mm Shot weight: 141 g Nsdpfxjy Smdyo Ah Uolb Injection pressure: 2500 bar Metering volume: 154 cm³ Clamping Unit: Clamping force: 160 t Tie bar spacing: 520 x 520 mm Platen size: 695 x 695 mm Ejector: hydraulic Clamping unit: hydraulic Control system: SELOGICA - Touchscreen Additional equipment: 2K injection moulding machine with rotary table and Geiger robot Very good technical condition Hybrid machine: energy-efficient and very quiet Euromap 67 Robot interface Air valve x 4 Hydraulic core pull x 5 Hot-runner control x 12 Reinforced injection units – bimetallic Machine with two cylinders / batteries with compressed nitrogen (additional charging for high-speed operation) The machine features a servo motor integrated in the injection unit for dosing the plastic material Parallel movements Screw diameter in the vertical injection unit: ⌀30 mm – 77 g/PS Integrated Arburg brand conveyor belt and sorting chute Original Weber brand rotary table, highly precise – electrically driven (inverter integrated in the machine) Rotary table and robot available at additional cost Dimensions: Weight: 8140 kg Length/width/height: 4.81 x 1.84 x 3.45 m All offered machines are commissioned by our service technicians before sale. Video of technical tests for the selected machine is available upon request, or you may participate in live technical demonstrations at our facility in Łódź. Price: On request

Stanje: zelo dobro (rabljeno), Leto izdelave: 2008, obratovalne ure: 80.313 h, vpenjalna sila: 1.600 kN, premer vijaka: 40 mm, razmak između stupova: 520 mm, delovna prostornina: 201 cm³, tlak vbrizgavanja: 2.000 letvica, injekcijska masa: 184 g, minimalna višina orodja: 250 mm, Arburg 520S-1600-400/170 dvokomponentni brizgalni stroj s sortirno loputo in plinsko okrepitevjo (245) Številka: 245 Razpoložljivost: Nsdpfx Asy Szrfoh Uolb na zalogi Leto proizvodnje: 2008 Proizvajalec: Arburg Stanje brizgalnega stroja: rabljen Premer polža [mm]: 40/30 Vbrizgana masa [g]: 184/77 Tlak vbrizgavanja [bar]: 2000/2000 Zapiralna sila [kN]: 1600 Razmik med stebri [mm]: 520 x 520 Velikost plošče [mm]: 688 x 688 Vrsta krmiljenja: Selogica Jezik: Angleščina, nemščina Vgrajena moč [kW]: 106 Delovne ure [h]: 80.313 Priključek za robota: 67 Euro Zračni ventil: 4x Veriga za jedro: 1x Krmiljenje gretja oblik: 3x Dovajalni lijak: NE

Stanje: dober (rabljeno), Leto izdelave: 2005, Ref.-No.: 18591 Manufacturer: ARBURG Model: 520 A 1600-400 Electric machines Year of manufacture: 2005 Clamping unit Clamping force: 160 ton Opening stroke: 450 mm Tie bar spacing (h x v): 520 x 520 mm Min. mould installation height: 250 mm Max. mould installation height: 550 mm Daylight opening: 700 mm Platen size (h x v): 695 x 695 mm Injection unit Screw diameter: 45 mm Shot volume: 254 cm³ Shot weight PS: 232 g Injection pressure: 1580 bar Nedpfxoxf T I Nj Ah Uolb Dimensions and weights Machine weight: 7,100 kg Dimensions LxWxH part 1: 5.1 x 1.7 x 2.3 m Additional information: The ARBURG 520 A series belongs to the fully electric ALLROUNDER range from ARBURG and stands for high precision, energy efficiency, and reliability in the injection moulding process. These machines are especially suitable for the production of technical plastic parts with demanding quality requirements, as well as for applications where repeatability and process stability are crucial. Typical features of this series: * Fully electric drive for all main movements * Significant energy savings compared to hydraulic machines * Highly precise injection and positioning accuracy * Quiet and clean operation (also ideal for medical applications) * Low maintenance requirements The 520 A range with 160 tonnes clamping force offers an excellent combination of performance and flexibility and is frequently used in fields such as automotive supply, medical technology, and technical plastic components. ARBURG is renowned for its durable and robust machines, making this series highly sought after on the used machinery market.

Stanje: dober (rabljeno), Leto izdelave: 2002, vpenjalna sila: 2.000 kN, premer vijaka: 55 mm, razmak između stupova: 570 mm, delovna prostornina: 427 cm³, tlak vbrizgavanja: 2.080 letvica, minimalna višina orodja: 300 mm, Tehnični podatki – Arburg 570C 2000-675 Splošne informacije: Leto izdelave: 2002 Krmiljenje: Selogica Vbrizgalna enota: Tip: … / 675 Premer polža: 55 mm Specifičen pritisk vbrizga: 2080 bar Vbrizgalni volumen: 427 cm³ Sistem zapiranja: Tip: 2000 / … Nodpfx Ahoyxnr Sj Uslb Sila zapiranja: 200 t Dimenzije plošč: 950 × 950 mm Prostor med stebri: 570 × 570 mm Višina orodja: 300 mm Hod odpiranja: 650 mm Maksimalna razdalja med ploščama: 950 mm

Stanje: pripravljen za uporabo (rabljen), Leto izdelave: 2007, vpenjalna sila: 5.000 kN, skupna masa: 26.400 kg, This 3-axis hydraulic injection moulding machine Arburg Allrounder 920S 5000-3200 was manufactured in 2007. It features a maximum clamping force of 5,000 kN, a screw diameter range from 70 to 90 mm, and a maximum shot weight of up to 1,860 g. Take advantage of the opportunity to purchase this hydraulic injection moulding machine Arburg Allrounder 920S. Contact us for further information about this machine. Nedpfxoydnigo Ah Uelb • Maximum mould opening force: 150 kN • Increased opening force: 100 / 1,000 kN • Opening stroke: up to 900 mm • Mould height: min. 400 – max. 1,050 mm • Distance between platen faces: 1,300 – 1,950 mm • Tie bar spacing (H × V): 920 × 920 mm • Platen size (W × H): 1,280 × 1,280 mm • Weight of moving platen (half): max. 8,000 kg • Ejector force: max. 800 kN • Ejector stroke: max. 250 mm Hydraulics / Drive • Hydraulic pump motor output: 75 kW • Dry cycle time (opening stroke 5): 4.5–6.44 s • Total installed power: 96 kW • Colour: Structural Light Grey / Mint Green / Red-Yellow • Control cabinet safety standard: DIN EN 60204 • Socket combination: 1 × Schuko, 1 × CEE Injection Unit • Screw diameter: 70 / 80 / 90 mm • Effective screw length (L/D): 23 / 20 / 18 • Maximum shot volume: 1,232 / 1,608 / 2,036 cm³ • Maximum shot weight (PS): 1,125 / 1,469 / 1,860 g • Plasticising capacity (PS): 185 / 215 / 250 kg/h • Maximum injection pressure: 2,500 / 2,000 / 1,580 bar • Injection rate: • Without accumulator: 290 / 380 / 482 cm³/s • With accumulator: 1,188 / 1,552 / 1,964 cm³/s • Hold pressure: max. 350 / 200 bar • Screw speed: 47 / 54 / 61 rpm • Screw torque: 3,500 Nm • Nozzle contact force: max. 110 kN • Nozzle stroke: max. 675 mm • Installed barrel heater power: 6 × 5,500 + 4,300 W • Installed nozzle heater power: 1,100 W • Oil fill volume: 590 litres • Motor + heater fuse rating: 200 A • Motor fuse: 125 A • Heater fuse: 63 A

Stanje: zelo dobro (rabljeno), Leto izdelave: 2017, obratovalne ure: 14.500 h, Funkcionalnost: popolnoma funkcionalen, 1 used two-component injection moulding machine with robot and rotary table Manufacturer: ARBURG Model: 470S1100-400/290 Year of manufacture: 2017 Nodpou E E Suofx Ah Uelb Clamping force: 110 tons Tie bar spacing: 420 x 420 mm Min./max. mould installation height: 450 mm Opening stroke: 950 mm Screw diameter 1: 35 mm Max. shot volume: 154 cm³ Injection moulded part weight: 141 g/PS Screw diameter 2: 30 mm Shot volume: 106 cm³ Injection moulded part weight: 97 g/PS Control system: SELGOCIA Equipment: - 3 core pulls - Vertical injection unit - Rotary table - 6-axis robot, manufacturer: KUKA, model: KR 16 Wikut, year: 2010 - Conveyor belt - Safety fence

Stanje: zelo dobro (rabljeno), Proizvajalec: ARBURG Model: Allrounder 370S-500-100 Leto izdelave: 2011 Serijska številka: 218960 Krmilni sistem: Tip krmiljenja: Arburg Selogica Enota za zapiranje: Zapiralna sila: 500 kN Nljdpfsx Eithex Ah Usb Vbrizgalna enota: Tip vbrizgavanja: vertikalni (vertikalna vbrizgalna enota) Premer polža: 20 mm

Stanje: zelo dobro (rabljeno), Proizvajalec: ARBURG Model: Allrounder 270S-500-60 Leto izdelave: 1997 Serijska številka: 170175 Krmilni sistem: Arburg Selogica Njdpfxjx Eiq Tj Ah Ujlb Zapiralna sila: 500 kN Premer polža: 15 mm

Stanje: zelo dobro (rabljeno), Proizvajalec: ARBURG Model: Allrounder 370S-700-70 Letnik izdelave: 2010 Serijska številka: 214430 Krmilni sistem: Arburg Selogica Direct Sila zapiranja: 700 kN (70 ton) Nsdpjx Eirqefx Ah Uolb Premer polža: 18 mm

Stanje: rabljeno, Leto izdelave: 2017, Injection moulding machine Arburg 470S 1100 290, year of manufacture 2017 2K machine Njdpfew D R N Rex Ah Uelb The machine has been out of operation for a longer period. It was built in 2017 and has only around 21,600 operating hours. The machine features a clamping force of 1,100 kN, with a 290 unit and 35 mm barrel installed below, and a 100 unit with 30 mm barrel above. Only ABS and TPE have been processed so far. The machine includes an integrated hot runner, three core pulls, and other options. Also included is a Kuka handling system, operated via the machine’s Selogica control, and the complete safety enclosure. The two material loaders and the large conveyor belt are not included in the sale.

Leto izdelave: 2018, stanje: pripravljen za uporabo (rabljen), Na voljo je kompaktni brizgalni stroj Arburg. Zapiralna sila: 180kN, vpenjalna razdalja: 221mm/221mm, dimenzije plošč X/Y: 400mm/400mm, maks. hod odpiranja: 275mm, min. vgradna višina orodja: 150mm, maks. razdalja med ploščama: 425mm, izmetalna sila: 18kN, hod izmetalca: 95mm, premer polža: 15mm, teža: ca. 1900kg, delovnih ur: ca. 23300h. Dokumentacija je na voljo. Možen ogled na lokaciji. Nedpfxjx E Ac Ee Ah Uolb

Leto izdelave: 2003, stanje: pripravljen za uporabo (rabljen), Zapiralna sila: 1300kN, premer polža: 40mm, najv. vbrizgalni tlak: 2120bar, vbrizgan volumen: 182cm³, masa vbrizga: 153g, razmak med stebri: 470mm/470mm, dimenzije plošč X/Y: 650mm/650mm, min. vgradna višina orodja: 275mm, najv. odprtina: 850mm, centriranje: 125mm. Dimenzije stroja X/Y/Z: ca. 4600mm/1600mm/2200mm, teža: ca. 5500kg. Zapiralna enota ima iztekanje olja na zapiralnem cilindru. Dokumentacija na voljo. Ogled na lokaciji je možen. Nedpfeygw Sisx Ah Ujlb

Stanje: delavnici obnovljeno (rabljeno), Leto izdelave: 2000, Funkcionalnost: popolnoma funkcionalen, Arburg injection molding machine from 2000. 130 tons clamping force. The machine is delivered fully reconditioned at our facility in Heras (Cantabria). New seals installed in the clamping unit. We can demonstrate the machine in operation. Technical Details CLAMPING FORCE: 1300 kN PLATEN DIMENSIONS: 660 x 840 mm OPENING STROKE: 575 mm MAXIMUM DISTANCE BETWEEN PLATENS: 800/850 mm Nljdpfx Ahsrxtpds Ujb DISTANCE BETWEEN TIE BARS: 420 x 420 / 470 x 470 mm SCREW DIAMETER: 50 mm INJECTION VOLUME: 353 cm³ INJECTION SHOT WEIGHT: 117 g YEAR OF MANUFACTURE: 2000 INJECTION PRESSURE: 2500 bar

Stanje: zelo dobro (rabljeno), Leto izdelave: 2008, obratovalne ure: 67.848 h, vpenjalna sila: 700 kN, premer vijaka: 35 mm, delovna prostornina: 144 cm³, tlak vbrizgavanja: 2.000 letvica, injekcijska masa: 132 g, Injection Moulding Machine Arburg 370S-700-290 Item Number: 232 Availability: In stock Year of Manufacture: 2008 Brand: Arburg Technical Specifications Shot Weight: 132 g Clamping Force: 700 kN Screw Diameter: 35 mm Injection Pressure: 2000 bar Tie Bar Distance: 370x370 mm Platen Size: 510x510 mm Minimum Mould Height: 200 mm Maximum Platen Distance: 600 mm Control System: Selogica Language: German Power: 23.9 kW Operating Hours: 67,848 h Nlsdpfevwcbgsx Ah Uob Weight: 3,300 kg Dimensions: 3.8x1.5 m Hopper: No Euromap Interface: Yes Air Valve: Yes

Stanje: rabljeno, Leto izdelave: 2000, skupna masa: 60 kg, Dobavni pogoji: FCA Pegnitz Dobavni rok: po dogovoru Nsdpfjx Iwc Esx Ah Ujlb Plačilni pogoji: 100 % plačilo pred prevzemom stroja, čisti neto

Stanje: zelo dobro (rabljeno), Leto izdelave: 2013, Funkcionalnost: popolnoma funkcionalen, vpenjalna sila: 400 kN, premer vijaka: 22 mm, razmak između stupova: 270 mm, delovna prostornina: 34 cm³, tlak vbrizgavanja: 2.000 letvica, injekcijska masa: 31 g, minimalna višina orodja: 200 mm, hod izmetalca: 125 mm, Arburg 270C 400-70 Golden Edition Zapiralna sila: 40 t Njdpfx Ahsy Ukyko Ujlb Leto izdelave: 2013 Vbrizgalna masa: 31 g Vbrizgalna enota: .../70 Premer polža: 22 mm Specifični tlak vbrizga: 2000 bar Prostornina vbrizga: 34 ccm Vbrizgalna masa: 31 g Zapiralni sistem orodja: 400/... Zapiralna sila: 40 t Dimenzije plošč orodja: 446 x 446 mm Višina orodja: 200 mm Hod odpiranja: 350 mm Največja razdalja med ploščami: 550 mm Hod izmetalca: 125 mm Splošni podatki: Krmiljenje: Selogica Oprema: 2 x pnevmatski ventil 2 x hidravlično jedro robot Multilift 3 cone vročih kanalov rotameter

Stanje: zelo dobro (rabljeno), Leto izdelave: 2011, Arburg 570H 2000-800 e² / Hybrid Machine / Production Line with Arburg Multilift Select Robot Year of manufacture: 2011 Injection unit: Screw diameter: 50 mm Shot weight: 359 g Injection pressure: 2000 bar Dosage volume: 392 ccm Clamping unit: Clamping force: 200 t Tie bar distance: 570x570 mm Njdpfx Ahjy Smfdj Uolb Platen dimensions: 795x795 mm Ejector: electric Clamping system: toggle lever Control: SELOGICA - touchscreen Additional equipment: Hybrid machine: energy-saving and very quiet Euromap 67 Robot interface Air valve x 4 Hydraulic core pull x 2 Hot runner control x 12 Injection unit hardened - bimetal Main motor of the machine - servo motor with inverter drive - energy-saving Injection unit is powered by servo motor, controlled by inverter Machine with cylinder / battery with compressed nitrogen (for rapid operation) Central lubrication Parallel movements Arburg Multilift Select 6kg transverse Robot Year of manufacture: 03.2011 4-axis robot: 3 axes driven by servo motors (electric); C-axis pneumatic Travel paths in axes: X-400, Y-800, Z-1400 Robot with adapter, conveyor belt, and safety enclosure Purchase of robot and conveyor belt possible at additional cost Dimensions: Weight: 8700 kg Length/Width/Height: 5.58x1.71x2.21 m All machines offered are started up by our service technicians before sale. It is possible to receive a video of the technical tests of the selected machine or participate in live technical tests at our company in Łódź. Price: Upon request

Stanje: zelo dobro (rabljeno), Leto izdelave: 2018, obratovalne ure: 20.500 h, Funkcionalnost: popolnoma funkcionalen, 1 used two-component injection molding machine with SIX-AXIS robot Manufacturer: ARBURG Model: 570S2200-400/170 Year of manufacture: 2018 Clamping force: 220 tons Tie bar spacing: 570 x 570 mm Minimum/maximum mold installation height: 350 mm Opening stroke: 1,000 mm Screw diameter 1: 40 mm Nlodpfxou E Id To Ah Ueb Max. shot volume: 201 cm³ Injection weight: 184 g/PS Screw diameter 2: 25 mm Shot volume: 59 cm³ Injection weight: 54 g/PS Control system: SELGOCIA Equipment: - 3 x core pulls - Vertical injection unit - Extended tie bars - Forward mounted cylinder - 6-AXIS robot, manufacturer: KUKA, model: KR 16 Wikut, year: 2018 - Conveyor belt - Safety fence

Stanje: zelo dobro (rabljeno), Leto izdelave: 2016, Funkcionalnost: popolnoma funkcionalen, vpenjalna sila: 700 kN, Oprema: dokumentacija / priročnik, Seologica krmiljenje Vpenjalna sila: 70 t Premer vijaka: 40 mm (visoko trdna izvedba) Razdalja med stebri V: 370 mm Razdalja med stebri H: 370 mm Razmik med stebri: 370x370 mm Platišča HxV: 510x510 mm Debelina orodja min-maks: 200 Hod: 400 mm Prostornina brizgalnega polnjenja: 188 cm3 Tip: Uni Pogon: hidravlični Nlodpfeygtqujx Ah Ujb Zračni ventil: 1 Delovne ure: 23.000 2 servo črpalki 4 prosti hladilni krogi 6 električnih grelnih con za orodje

Stanje: zelo dobro (rabljeno), Leto izdelave: 2010, obratovalne ure: 44.600 h, Funkcionalnost: popolnoma funkcionalen, 1,0 kos rabljene dvokomponentne brizgalke s robotom Proizvajalec: ARBURG Tip: 570S2200-400/170e² Nodpfx Aju E E H Ssh Uslb Letnik: 2010 Zapiralna sila: 220 ton Razmik med stebri: 570 x 570 mm Min./maks. montažna višina: 350 mm Odpiralna pot: 1.000 mm Polž DN 1: 35 mm Maks. hodilni volumen: 154 cm³ Teža brizganca: 141 g/PS Polž DN 2: 30 mm Hodilni volumen: 59 cm³ Teža brizganca: 47 g/PS Upravljanje: SELGOCIA Oprema: 3 x jedrne izvlečne palice Vertikalna brizgalna enota 6-osni robot, proizvajalec: KUKA, tip: KR 16 Wikut, letnik: 2010 Transportni trak Zaščitna ograja

Stanje: pripravljen za uporabo (rabljen), Leto izdelave: 2005, Funkcionalnost: popolnoma funkcionalen, številka stroja/vozila: 198346, vpenjalna sila: 3.600 kN, premer vijaka: 70 mm, tlak vbrizgavanja: 2.000 letvica, injekcijska masa: 984 g, odmični hod: 1.400 mm, TEHNIČNE PODROBNOSTI Sila zapiranja: 3.600 kN Velikost plošče (V × Š): 1.040 × 1.040 mm Razmak med stebri (V × Š): 720 × 720 mm Minimalna višina orodja: 300 mm Maksimalna višina orodja: 300 mm Maksimalna odprtina: 1.400 mm Premer polža: 70 mm Prostornina vbrizga: 1.078 cm³ Nledpfx Ajy T Hrmeh Ujb Teža brizga: 984 g Tlak vbrizga: 2.000 bar PODROBNOSTI STROJA Elektrohidravlična oprema Nazivna moč črpalnega motorja: 55 kW Grelnik: 30,3 kW Neto teža z omarico za upravljanje: 17 t

Stanje: zelo dobro (rabljeno), Leto izdelave: 2010, Clamping force: 200 t Screw diameter: 35 mm Nedpfjwpkfcsx Ah Uolb Shot weight: 141 g Tie bar spacing (vertical): 570 mm Tie bar spacing (horizontal): 570 mm Shot volume: 154 cm³ Type: Horizontal Drive: Hybrid

Stanje: skoraj kot novo (rabljeno), Leto izdelave: 2006, Zapiralna sila: 220 ton Dvižni hod odpiranja: 650 mm Višina kalupa: 300 mm Razmak vpenjalnih plošč: 950 mm Razmak med stebri: 570 x 570 mm Vpenjalne plošče za orodje (Š x V): 795 x 795 mm Hod izmetalca: 225 mm Premer polža: 50 mm Hod polža: 200 mm Prostornina vbrizga: 392 cm3 Teža brizga: 359 g Tlak vbrizga: 2000 bar Delovne ure: 10.444 Jedrne vleke: 1x Njdpfx Ahoy Txgcs Ujlb

Stanje: pripravljen za uporabo (rabljen), Leto izdelave: 2016, vpenjalna sila: 4.000 kN, premer vijaka: 70 mm, skupna širina: 2.300 mm, skupna masa: 22.700 kg, največja dolžina izdelka: 8.000 mm, This 3-axis hydraulic injection molding machine Arburg 820 S 4000-2100 was manufactured in 2016. It features a clamping force of 4000 kN, a platen size of 1171 x 1171 mm, and a maximum mold installation height of 850 mm. With a screw diameter of 50 mm and an injection unit size of 2100, this machine is ideally equipped for high-quality injection molding performance. Take the opportunity to acquire this hydraulic injection molding machine Arburg 820 S 4000-2100. Please contact us for further details. • Control system: SELOGICA direct • Tie bar distance: 820 x 820 mm • Platen dimensions: 1171 x 1171 mm • Max. mold installation height: 850 mm • Max. opening stroke: 700 mm • Max. daylight: 1550 mm • Ejector force: 100 kN • Ejector stroke: 250 mm • Max. weight of moving mold half: 4500 kg • Injection unit: 2100 • Heating zones: 6 + nozzle • Hydraulic pump drive power: approx. 55 kW • Total installed power: 88.9-96.2 kW • Connected load total: 124 kW • Operating voltage: 400 V 3~ 50 Hz • Total machine cycles: 4,157,591 • Pump hours: 69,800 h • Automatic operation hours: 58,556 h • Machine options: 2x core pulls, AES energy saving system Additional Equipment • ARBURG Multilift Select 15 kg robot (2016, transverse) • Payload: 15 kg • Y-axis stroke extension: 1400 mm • C-axis: pneumatic 0/90°, 28 Nm torque • Vacuum system: 2 circuits (each 23 l/min) • Gripper interface: 8 inputs / 4 outputs (programmable) • Valve equipment: 5/3-way valve Nedpfeyzrddox Ah Uolb • Safety: monitored adjustable working area • Conveyor belt: 800 x 2500 mm • Blower unit • Screw diameter: 50 mm

Stanje: zelo dobro (rabljeno), Leto izdelave: 2012, ARBURG A 375 V 500-170 rotacijska brizgalka (S&P 3773) Leto izdelave: 2012 Delovne ure: 36.900 ur Polž: 25 HVF mm Tlačna sila brizganja: 2500 bar Prostornina hoda: 59 cm³ Zapiralna sila: 50 t Min. višina vgradnje orodja: 170 mm Maks. razmik plošč: 520 mm Dimenzije: 3300 x 1700 x 2100 mm Teža: 3740 kg Priključek: 11 + 11 = 22 kW Vertikalna brizgalka z 900 mm rotacijsko mizo, kot vrtenja levo/desno 180°, vključno z napravami za pozicioniranje v vodoravni položaj za brizganje v razdelilno ravnino, vključno s škarjastim dvigalom in zaščitnimi ploščami, HHG EM67, zračnim ventilom, EM73, ogrevanjem orodja itd... Nova cena cca 170.000,- evrov Nedpfxoy Ukbhe Ah Uolb Cena: po dogovoru Kontaktna oseba: G. Ralf Schulz