Beli Arburg 570A-2000-800 /170 (243) bekas (18.691)

Kondisi: baik (bekas), Tahun pembuatan: 2013, jam operasional: 36.163 h, Fungsionalitas: berfungsi sepenuhnya, gaya penjepit: 500 kN, diameter sekrup: 25 mm, volume langkah: 59 cm³, en Ndodeytdfispfx Afvoa

Kondisi: sangat baik (bekas), Tahun pembuatan: 2013, jam operasional: 22.420 h, Fungsionalitas: berfungsi sepenuhnya, gaya penjepit: 1.000 kN, diameter sekrup: 20 mm, volume langkah: 31 cm³, gaya ejektor: 25.000 N, lintasan ejektor: 175 mm, panjang total: 4.200 mm, lebar total: 2.100 mm, berat keseluruhan: 4.300 kg, jenis arus masuk: tiga fasa, tegangan masuk: 400 V, diameter meja putar: 1.200 mm, Perlengkapan: dokumentasi / manual, de_hu_01 Ndedpfxey Akpus Afvja

Kondisi: sangat baik (bekas), Tahun pembuatan: 2012, jam operasional: 37.830 h, Fungsionalitas: berfungsi sepenuhnya, gaya penjepit: 2.500 kN, diameter sekrup: 50 mm, jarak antara tiang: 630 mm, volume langkah: 392 cm³, Perlengkapan: dokumentasi / manual, Nomor stok: 503409 Produsen: ARBURG Tipe: Allrounder 630 S 2500-800 Kontrol: Selogica Tahun pembuatan: 2012 Jam operasional: 37.830 jam Data Teknis Sisi Penutupan Gaya penjepit: 2.500 kN Jarak antar tie bar h x v: 630 x 630 mm Ukuran pelat h x v: 900 x 900 mm Tinggi pemasangan min.: 300 mm Tinggi pemasangan maks.: 700 mm Jarak antar pelat maks.: 1.300 mm Jalur bukaan: 600 mm Langkah ejektor: 225 mm Gaya ejektor: 90 kN Diameter pemosisian pelat bergerak: 160 mm Diameter pemosisian pelat tetap: 160 mm Data Teknis Sisi Injeksi Diameter sekrup: 50 mm Volume langkah: 392 ccm Tekanan injeksi: 2.000 bar Panjang sekrup: 20 l/d Langkah sekrup: 200 mm Kecepatan putar sekrup: 60 rpm Torsi sekrup: 1.000 Nm Debit injeksi ke luar: 300 g/dtk PS Jumlah zona pemanas: 8 Langkah nosel: 400 mm Dimensi & Berat Dimensi mesin (PxLxT): 6,4 m x 1,95 m x 2,21 m Berat total: 12.140 kg Perlengkapan Njdpfszfi Tzex Afvoda Teks layar bahasa Jerman Teks layar bahasa Inggris Stop kontak CEE 16A Antarmuka Compact Flash untuk penyimpanan data Penarik inti hidrolik 1x Katup udara 2x Mesin dengan water battery Mesin tanpa hopper material Elemen penyeimbang Antarmuka EUROMAP 67 untuk penanganan Antarmuka OPC Stop kontak Schuko 10A Unit seleksi Pemanas tool 12x

Tahun pembuatan: 2006, Kondisi: bekas, Gaya penguncian: 500 kN, jarak antar kolom: 320x320 mm, diameter silinder: D30, sistem kontrol: Arburg SLOGICA, jumlah jam operasi otomatis: 63.147 jam, jumlah jam operasi pompa: 65.755 jam, jumlah jam operasi semi-otomatis: 14 jam, jumlah siklus: 13.943.435. Pemeriksaan di lokasi dapat dilakukan. Nedpszun Uvofx Afveda

Tahun pembuatan: 2010, Kondisi: siap digunakan (bekas), 7d04d14d Ndsdoyddy Uepfx Afvoa

Tahun pembuatan: 2009, Kondisi: siap digunakan (bekas), angebot-2-spritzgiessmaschinen-2008-2009 Nodpfx Aex I Rqcsfvjda

Tahun pembuatan: 2002, Kondisi: siap digunakan (bekas), Maximum clamping force: 800 kN, heating capacity: 9.4 kW, pump motor power: 1 x 18.5 kW, connected load: 27.9 kW, weight: 7.4 t, on-site inspection is possible. Ndedpfx Afsum U S Eevoa

Tahun pembuatan: 2011, Kondisi: siap digunakan (bekas), Tersedia mesin cetak injeksi vertikal Arburg yang hampir baru dan dilengkapi penuh, berasal dari laboratorium, di mana unit plastifikasinya tidak pernah digunakan. Gaya penjepit: 500kN, gaya pembuka: 30kN, jarak pembukaan: 250mm, gaya ejektor: 30kN, langkah ejektor: 70mm, diameter sekrup: 25mm/30mm/35mm, gaya penekanan nozzle: 50kN, langkah mundur nozzle: 210mm, daya pemanas: 9kW, zona pemanas: 5, volume hopper granulat: 25l, tingkat teknologi: T2, diameter meja putar: 900mm. Dimensi mesin X/Y/Z: sekitar 3400mm/2050mm/3500mm, berat: sekitar 4200kg, jam operasi: 9201h, siklus mesin: sekitar 120k. Mesin hanya digunakan untuk material komposit seperti karbon dan kevlar. Dokumentasi tersedia. Inspeksi di lokasi memungkinkan. Nodpfezd Ehxox Afvjda

Tahun pembuatan: 2018, Kondisi: siap digunakan (bekas), Injection unit: 1500 T-2 EUROMAP 400 without hydraulic lines. Clamping force: 2000 kN, screw diameter: 40 mm, nozzle diameter: 2.5 mm, effective screw length: 20 mm, max. shot volume: 201 cm³, max. shot weight (PS): 184 g. Hours in automatic operation: 20,700 h, pump hours: 27,800 h, cycles: 3.4 million. Documentation available. On-site inspection possible. Nsdpfjr N Rh Hox Afvjda

Tahun pembuatan: 2007, Kondisi: siap digunakan (bekas), de_001 Nsdpfxsyddzls Afvsda

Kondisi: baik (bekas), Tahun pembuatan: 2007, gaya penjepit: 800 kN, diameter sekrup: 40 mm, jarak antara tiang: 370 mm, tekanan injeksi: 1.390 batang, berat injeksi: 168 g, tinggi cetakan (min.): 250 mm, lintasan ejektor: 150 mm, Kekuatan penutupan: 80 ton Tahun produksi: 2007 Unit injeksi: 250 Diameter sekrup: 40 mm Tekanan injeksi spesifik: 1390 bar Volume injeksi: 185 cm³ Sistem penutupan cetakan: 800 Kekuatan penutupan: 80 ton Jarak antar kolom: 370 x 370 mm Kekuatan pengeluaran: 40 kN Tinggi cetakan: 250 mm Jarak pembukaan: 440 mm Langkah pengeluaran: 150 mm Berat: 3180 kg Kontrol: Selogica Peralatan: Nsdpfx Aszt In Tefveda 2 x inti hidraulik 5 zona pemanas cetakan Rotameter

Kondisi: siap digunakan (bekas), Tahun pembuatan: 2014, jam operasional: 22.626 h, gaya penjepit: 100 kN, diameter sekrup: 15 mm, Mesin cetak injeksi hidraulik, tahun pembuatan 2014. Mesin Arburg 470 H 1000-170 ini memiliki gaya penguncian sebesar 100 ton dan diameter sekrup sebesar 15 mm. Mesin ini dilengkapi dengan unit seleksi dan konstruksi satu pelat dengan area penjepitan sebesar 470 x 470 mm. Jika Anda mencari kapasitas cetak injeksi berkualitas tinggi, pertimbangkan Arburg 470 H 1000-170 yang kami tawarkan untuk dijual. Hubungi kami untuk informasi lebih lanjut. • Unit seleksi: ya • Pelat tunggal: ya • Jarak antar penyangga: 470 x 470 mm • Jam operasi: 22.626 jam Nedpfx Aszm S Auofveda • Kelistrikan: • Tegangan operasi: 400 V, 3~, 50 Hz • Tegangan kontrol: 230 V, 50 Hz; 24 V~ • Arus nominal motor/pemanas: 80 / 58 A • Total arus nominal: 138 A • Total daya terpasang: 75 kW • Catatan kondisi: masalah kecil pada servomotor Peralatan tambahan • Sistem penanganan Geiger (opsional)

Kondisi: sangat baik (bekas), Tahun pembuatan: 2012, Arburg 680CB 400-170 / Vertical Injection Moulding Machine, Tie-bar-less / Excellent Technical Condition Year of Manufacture: 2012 Injection Unit: Screw diameter: 25 mm Shot weight: 54 g Injection pressure: 2,500 bar Dosage volume: 59 ccm Clamping Unit: Clamping force: 40 t Tie-bar distance: 0x0 mm Ejector: hydraulic Clamping unit: hydraulic Control system: SELOGICA - touchscreen Ndedpezc Ng Defx Afvea Additional equipment: Excellent technical condition Vertical, tie-bar-less injection moulding machine Euromap 67 Robot interface Air valve x 3 Hydraulic core pull x 3 Hot runner control x 12 Injection unit hardened – bimetallic Proportional valve on injection unit – precise injection Screw diameter change possible Machine regularly serviced by authorised Arburg service Original Arburg tool crane Dimensions: Weight: 6,500 kg Length/Width/Height: 1.97x1.69x3.40 m All machines offered are commissioned by our service technicians prior to sale. It is possible to receive a video of the technical tests for the selected machine or to participate in live technical tests at our facility in Łódź. Price: On request

Kondisi: sangat baik (bekas), Tahun pembuatan: 2017, Arburg 370E 600-170 with Arburg Multilift Select Robot / Electric Machine Year of manufacture: 11.2017 Injection Unit: Screw diameter: 30 mm Shot weight: 77 g Injection pressure: 2000 bar Metering volume: 85 cc Clamping Unit: Clamping force: 60 t Tie bar distance: 370x370 mm Platen size: 510x510 mm Ejector: electric Clamping system: toggle lever Control: SELOGICA - Touchscreen Additional Equipment: Production line with Arburg Multilift Select robot and conveyor belt Electric machine: high-speed, energy efficient, and very quiet Operating hours: h in automatic mode Euromap 67 Robot interface 2 x air valves 1 x hydraulic core pull Hot runner control x 24 Injection unit: hardened - bimetallic Main drive motor: servo motor with inverter for energy savings The injection unit is driven by a servo motor controlled by an inverter Parallel movements Central lubrication Machine with two cylinders / Nitrogen accumulator (additional charge for rapid operation) Ndjdezc Nm Rspfx Afvea Integrated Arburg conveyor belt and sorting flap Arburg Multilift Select Robot, 6 kg, transverse Year: 11.2017 4-axis robot: 3 axes driven by servo motors (electric), C axis - pneumatic Travel in axes: X-600, Y-800, Z-1800 Robot safety package Robot supplied with adapter and protective housing Purchase of robot and conveyor belt at additional cost Dimensions: Weight: 3600 kg Length/Width/Height: 4.00x1.45x2.04 m All machines offered are started up by our service technicians prior to sale. It is possible to obtain a video of the technical tests of the selected machine or to participate in live technical tests at our facility in Łódź. Price: On request.

Kondisi: sangat baik (bekas), Tahun pembuatan: 2004, Arburg-420C-800-250-en Njdpfx Afjzc Nq Asvsda

Kondisi: sangat baik (bekas), Tahun pembuatan: 2012, Arburg 520H 1500-800 e² / Hybrid Injection Moulding Machine / Production Line with Side-mounted Arburg Multilift H Robot Year of manufacture: 09.2012 Ndodszc N R Aopfx Afvsa Injection Unit: Screw diameter: 55 mm Shot weight: 434 g Injection pressure: 1650 bar Dosage volume: 474 ccm Clamping Unit: Clamping force: 150 t Tie bar distance: 520x520 mm Platen size: 695x695 mm Ejector: electric Clamping system: toggle lever Control system: SELOGICA - Touchscreen Additional equipment: - Hybrid machine: high-speed, energy-saving, and very quiet - Control with air valve - Core pull control - Control with 12 hot runner zones - Injection unit hardened - bimetallic - Main motor of the machine – servo motor driven by inverter – energy saving - Injection unit driven by servo motor controlled by inverter - Machine equipped with cylinder / accumulator with compressed nitrogen (additional charge for high-speed operation) - Central lubrication - Automatic mould height adjustment - Kistler sensor – mould pressure control - The injection moulding machine was operated in a so-called “cleaning room”, equipped with additional protection against contamination as well as two fume absorbers - Side-mounted Arburg Multilift H robot Year of manufacture: 2012 - 5-axis robot: Z-axis servo-motor driven (electric); X-, Y- and B-axes (rotation) driven pneumatically - Safety package for the robot - Robot with adapter, conveyor with electric height adjustment, protective housing - Purchase of robot and conveyor at an additional cost Dimensions: Weight: 6840 kg Length/Width/Height: 5.03x1.56x2.21 m All machines offered are started and tested by our service technicians prior to sale. A video of the technical tests of the selected machine can be provided or you are welcome to attend live technical testing at our company in Łódź. Price: On request

Kondisi: sangat baik (bekas), Tahun pembuatan: 2006, Arburg 320C 500-170 with Wittmann W811 Robot Year of manufacture: 12/2006 Injection Unit: Screw diameter: 30 mm Shot weight: 77 g Injection pressure: 2000 bar Dosage volume: 85 ccm Clamping Unit: Clamping force: 50 t Tie bar spacing: 320x320 mm Platen dimensions: 446x446 mm Ejector: hydraulic Clamping unit: hydraulic Control system: SELOGICA - touchscreen Additional equipment: Euromap 67 Robot interface 1 x air valve 1 x hydraulic core pull Hardened injection unit - bimetallic Proportional valve on injection unit – precise injection Integrated sorting flap Wittmann W811 Robot Year of manufacture: 2010 4-axis robot: 3 axes driven by servomotors (electric); C axis - pneumatic Travel in axes: X-420, Y-1200, Z-1500 Touch control panel Safety package for robot Robot with adapter and protective housing Optional purchase of the robot for an additional charge Dimensions: Weight: 2400 kg L x W x H: 3.41 x 1.47 x 1.99 m Drive: Pump/motor: 11 kW Heating capacity: 9.4 kW Total power: 20.4 kW Nsdpfx Aszc Nhusfvsda All machines offered are commissioned by our service technicians prior to sale. It is possible to receive a video of the technical tests for the selected machine or to participate in live technical tests at our company in Łódź. Price: On request

Kondisi: sangat baik (bekas), Tahun pembuatan: 2014, Arburg 320C 500-170 e² / Hybrid Machine Year of manufacture: 2014 Injection unit: Screw diameter: 30 mm Nodpfxozc Nkpo Afvjda Shot weight: 77 g Injection pressure: 2000 bar Dosage volume: 85 cc Clamping unit: Clamping force: 50 t Tie bar distance: 320x320 mm Platen size: 446x446 mm Ejector: hydraulic Clamping unit: hydraulic Control: SELOGICA - Touchscreen Additional equipment: Hybrid machine: energy-saving and very quiet Operating hours: 48,000 h in automatic mode Air valve x 2 Core pull control Hot runner controller x 8 Injection unit hardened - bimetallic Main motor of the machine - Servo motor with inverter drive – energy saving Proportional valve on injection unit – precise injection Dimensions: Weight: 2210 kg Length/Width/Height: 3.41x1.43x1.99 m All offered machines 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 to participate in live technical tests at our company in Łódź. Price: On request

Kondisi: sangat baik (bekas), Tahun pembuatan: 2012, Arburg 520H 1500-800 e² / hybrid machine / production line with Arburg Multilift H side-entry robot Year of manufacture: 04.2012 Injection unit: Screw diameter: 55 mm Shot weight: 434 g Injection pressure: 1,650 bar Dosing volume: 474 cc Clamping unit: Clamping force: 150 t Tie bar spacing: 520x520 mm Platen dimensions: 695x695 mm Ejector: electric Clamping system: toggle Control system: SELOGICA - touchscreen Additional equipment: Hybrid machine: high-speed, energy-efficient, and very quiet Control with air valve Core pull control Hot runner control x 12 Injection unit hardened – bimetal Main motor: Servo motor with inverter – energy saving Injection unit driven by servo motor controlled by inverter Machine equipped with cylinder / battery with compressed nitrogen (additional charge for fast operation) Central lubrication Automatic mould height adjustment Kistler sensor – mould pressure control The injection moulding machine was operated in a so-called "cleaning room", and is equipped with additional protective devices against contamination as well as two fume absorbers Arburg Multilift H side-entry robot Year of manufacture: 2012 5-axis robot: Z axis servo-driven (electric); X, Y, and B axes (rotation) pneumatic Safety package for robot Robot with adapter, conveyor belt with electric height adjustment, protective enclosure Purchase of the robot and conveyor belt for an additional charge Dimensions: Ndedpszc N Syjfx Afvea Weight: 6,820 kg Length/Width/Height: 5.03x1.56x2.21 m All machines offered are started up by our service technicians prior to sale. It is possible to receive a video of the technical tests of the selected machine or to participate in live technical tests at our company in Łódź. Price: On request

Kondisi: sangat baik (bekas), Tahun pembuatan: 2005, Arburg 320A 500-170 with sprue picker / Electric Injection Moulding Machine Year of manufacture: 2005 Ndsdpfszc Nhnjx Afvea Injection Unit: Screw diameter: 35 mm Shot weight: 105 g Injection pressure: 1470 bar Dosage volume: 115 ccm Clamping Unit: Clamping force: 50 t Tie bar distance: 320x320 mm Platen size: 446x446 mm Ejector: electric Clamping unit: toggle lever system Control system: SELOGICA Additional equipment: Electric machine: high-speed, energy-efficient, and very quiet Euromap 67 Robot interface Injection unit hardened – bimetallic Central lubrication Machine equipped with integrated Arburg conveyor belt and original sorting flap Dimensions: Weight: 3500 kg Length/Width/Height: 3.41x1.43x1.99 m Drive: Pump/motor: 10.2 kW Heating capacity: 5.5 kW All offered machines are started and tested by our service technicians prior to sale. It is possible to receive a video of the selected machine’s technical tests or to participate in live technical demonstrations at our facility in Łódź. Price: On request

Kondisi: sangat baik (bekas), Tahun pembuatan: 2008, Arburg 520S 1300-800 / Machine in Very Good Technical Condition Year of Manufacture: 2008 Injection Unit: - Screw diameter: 50 mm - Injection weight: 359 g - Injection pressure: 2000 bar - Dosing volume: 392 cm³ Clamping Unit: - Clamping force: 130 t - Tie bar distance: 520 x 520 mm - Platen size: 695 x 695 mm - Ejector: hydraulic - Clamping unit: hydraulic Control System: SELOGICA - Touchscreen Additional Equipment: - Machine in very good technical condition - Euromap 67 - Euromap 12 - Robot interface - Air valve x 2 - Injection unit hardened - bimetallic - The machine has been regularly serviced by authorized Arburg service in Germany Dimensions: - Weight: 6,450 kg - Length/Width/Height: 4.81 x 1.57 x 2.19 m Drive: - Pump/Motor: 30 kW Ndedpszc N Inofx Afvoa All machines offered are commissioned by our service technicians prior to sale. It is possible to receive a video of the technical tests of the selected machine or to participate in live technical tests at our facility in Łódź. Price: On request

Kondisi: sangat baik (bekas), Tahun pembuatan: 1999, en-Arburg 420C 800-250 with Amboss+Langbein sprue picker Year of manufacture: 1999 Injection unit: Screw diameter: 40 mm Shot weight: 158 g Injection pressure: 1390 bar Dosage volume: 188 ccm Clamping unit: Clamping force: 80 t Tie bar distance: 420x420 mm Ndedpfxozc Np Eo Afvja Platen size: 570x570 mm Ejector: hydraulic Clamping unit: hydraulic Control system: SELOGICA Additional equipment: Euromap 12 Robot interface Control with air valve Core pull control Injection unit hardened - bimetallic Dimensions: Weight: 3180 kg Length/Width/Height: 4.30x1.64x2.08 m Drive: Pump/Motor: 15 kW Heating capacity: 6.5 kW Total power: 21.5 kW All offered machines are commissioned by our service technicians prior to sale. It is possible to receive a video of the technical tests performed on the selected machine or to participate in live technical tests at our company in Łódź. Price: On request

Kondisi: sangat baik (bekas), Arburg 520H 1500-800 e² / Hybrid Machine / Production Line with Arburg Multilift H Side Entry Robot Year of manufacture: 2013 Injection Unit: Screw diameter: 55 mm Shot weight: 434 g Injection pressure: 1,650 bar Dosage volume: 474 cc Clamping Unit: Clamping force: 150 t Tie bar spacing: 520 x 520 mm Platen size: 695 x 695 mm Ejector: electric Clamping system: toggle lever Control system: SELOGICA - Touchscreen Additional equipment: Nodpfx Aezc N Smjfvsda Hybrid machine: high-speed, energy-saving, and very quiet Euromap 67 Robot interface Control with air valve Hydraulic core pull x 1 Hot runner control x 12 Injection unit hardened - bimetallic Main drive motor - servo motor with inverter for energy saving Injection unit driven by a servo motor controlled by inverter Machine equipped with cylinder/battery with compressed nitrogen (additional charge for rapid operations) Central lubrication Automatic mold height adjustment Kistler sensor - mold pressure control The injection molding machine was operated in a so-called "clean room" and is fitted with additional protective devices against contamination as well as two fume absorbers Side-entry robot Arburg Multilift H Year of manufacture: 2013 5-axis robot: Z-axis servo-driven (electric); X-, Y-, and B-axis (rotation) pneumatic Robot safety package Robot with adapter, conveyor belt with electric height adjustment, safety enclosure Purchase of robot and conveyor belt at extra cost Dimensions: Weight: 6,680 kg Length/Width/Height: 5.03 x 1.56 x 2.21 m All machines offered are started up by our service technicians before sale. It is possible to obtain a video of the technical tests of the selected machine or to participate in live technical tests at our company site in Łódź. Price: On request.

Kondisi: sangat baik (bekas), Tahun pembuatan: 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 Injection pressure: 2,500 bar Nedpezc N Tqsfx Afvoda Dosage volume: 154 ccm Clamping Unit: Clamping force: 160 t Tie-bar distance: 520x520 mm Dimensions of the mounting plates: 695x695 mm Ejector: hydraulic Clamping unit: hydraulic Control: SELOGICA - Touchscreen Additional Equipment: 2K injection molding machine with rotary table and Geiger robot Very good technical condition Hybrid machine: energy-efficient and very quiet Euromap 67 Robot interface Air valves x 4 Hydraulic core pull x 5 Hot runner control x 12 Reinforced injection unit – bimetal Machine equipped with two cylinders / batteries with compressed nitrogen (extra charge for fast operation) The machine features a servo motor integrated in the injection unit for dosing the plastic Parallel movements Screw diameter in the vertical injection unit: ⌀30 mm - 77 g/PS Integrated conveyor belt by Arburg and sorting chute Original Weber rotary table, highly precise – electrically driven (inverter integrated into the machine) Purchase of the rotary table and robot at extra cost Dimensions: Weight: 8,140 kg Length/Width/Height: 4.81x1.84x3.45 m All machines offered are started and tested by our service technicians prior to sale. It is possible to receive a video of the technical tests of the selected machine or to participate in live technical demonstrations at our facility in Łódź. Price: On request

Kondisi: sangat baik (bekas), Tahun pembuatan: 2005, Arburg 1200T 800-150 / Vertical Injection Moulding Machine with Rotary Table Year of manufacture: 2005 Injection unit: Screw diameter: 25 mm Shot weight: 45 g Injection pressure: 2500 bar Dosage volume: 54 ccm Nsdpfx Afjzc Nqcoveda Clamping unit: Clamping force: 80 t Tie bar distance: 0x0 mm Platen size: 1200 mm Ejector: hydraulic Clamping unit: hydraulic Control system: SELOGICA Additional equipment: Air valve x 6 Hydraulic core pull x 6 Hot runner control system Injection unit hardened – bimetallic Rotary table diameter: 1200 mm Kistler sensor – mould pressure regulation Machine serviced by authorised Arburg service in Germany Dimensions: Weight: 7,400 kg Length/Width/Height: 3.92x1.61x3.78 m Drive: Pump/Motor: 22 kW Heating capacity: 9.4 kW Total connected load: 31.4 kW All machines offered are started and tested by our service technicians prior to sale. It is possible to receive a video of the technical tests of the selected machine or participate in live technical tests at our premises in Łódź. Price: On request