Mg Hidravlični Trivaljni Stroj Za Okroglo Krivljenje nakup rabljenega (87.972)

Stanje: dober (rabljeno), Technical Data: Working length: 2100 mm Maximum bending capacity: 10.0 mm Pre-bending: 8.0 mm Top roll diameter: 200 mm Bottom roll diameter: 180 mm Number of driven rolls: 3 Hydraulic drop-end bearing Cone bending device Extended rolls for section bending Control panel with digital display Motor power: 5.5 kW CE marking Dimensions (L x W x H): approx. 3100 x 1150 x 1250 mm Weight: approx. 4 tons Kdodpfewchn Usx Al Nok Accessories: Several sets of rolls for pipe and section rolling The seller is not liable for typographical or data transmission errors. The machine is in visual and technical condition, and wear consistent with its age; used machines are sold without any warranty.

Stanje: zelo dobro (rabljeno), Tehnični podatki: Kodexyvx Tepfx Al Njdk Delovna širina: 3100 mm najv. zmogljivost upogibanja: 16,0 mm najv. pred-upogib: 12,0 mm Premer zgornjega valja: 300 mm Premer stranskih valjev: 270 mm vsi trije valji poganjani kaljeni valji konusna upogibna oprema z nagibom obeh stranskih valjev vrtljiva upravljalna plošča z digitalnim prikazom hidravlični zložljivi ležaji moč motorja: 7,5 kW Dimenzije (dolžina x širina x višina): cca 5800 x 1700 x 1500 mm Lastna teža: cca 8,5 ton Prodajalec ne prevzema odgovornosti za napake pri pisanju ali prenosu podatkov. Stroj je po videzu, tehniki in obrabi primeren starosti; rabljeni stroji se prodajajo brez kakršnegakoli jamstva.

Leto izdelave: 2002, stanje: zelo dobro (rabljeno), Technical specifications: Working width: 3550 mm Max. bending capacity: 42.0 mm Max. prebending: 35.0 mm CNC control system Upper roller diameter: 480 mm Second upper roller diameter: 540 mm Diameter of lateral side rollers: 480 mm Diameter of central lower roller: 480 mm Conical bending device by angular adjustment of both side rollers Mobile control panel with digital display Hydraulic drop end bearing Net weight: approx. 44 tonnes Additional equipment: Lateral bending aid Swing-away upper bending aid Additional upper roller The seller assumes no liability for typing or data transmission errors. The machine’s appearance, technology, and wear are consistent with its age; used machines are sold without any guarantee. Kodpeittzfefx Al Nodk

Stanje: novo, Condition: New Delivery time: approx. 12–14 weeks ex works Country of origin: Turkey Price: €134,000 Leasing rate: €2,532.60 Bending length: 3,100 mm Max. bending capacity (mild steel): 25 mm Max. plate thickness without prebending at D = 5x top roll: 25 mm Max. plate thickness without prebending at D = 3x top roll: 20 mm Max. plate thickness without prebending at D = 1.5x top roll: 20 mm Max. plate thickness with prebending at D = 5x top roll: 20 mm Max. plate thickness with prebending at D = 1.5x top roll: 16 mm Top roll diameter: 360 mm Lower roll diameter: 360 mm Side roll diameter: 270 mm Max. opening: 60 mm Working height: 1,510 mm Motor power: 22 kW Length: 5,560 mm Width: 2,060 mm Height: 2,050 mm Weight: 16,750 kg 4 rolls PLC Fully hydraulic drive for top and lower rolls (from 30 mm bending capacity for all four rolls) via planetary gearbox Hydraulic side roll adjustment with electronic synchronization Hydraulic lower roll adjustment with mechanical synchronization Adjustable clamping pressure Variable roll speed Hardened rolls Conical bending device Hydraulic drop-end bearing Mobile control panel Overload protection Operating manual in GERMAN and ENGLISH Kdedpfeypbqusx Al Nsk Equipment complies with CE regulations OPTIONS: Upper and side plate supports NC control IMPORTANT NOTES FOR CONICAL BENDING: The max. plate thickness is 50% of the rated capacity The cone length must not exceed 30% or must be more than 60% of the roll length Hardened rolls are recommended

Stanje: novo, Condition: New Delivery time: approx. 12–14 weeks from order Country of origin: Turkey Price: €70,300 Leasing rate: €1,328.67 Bending length: 3,100 mm Max. bending capacity – mild steel: 8 mm Max. plate thickness without prebending at D=5x top roll: 8 mm Max. plate thickness without prebending at D=1.5x top roll: 6 mm Kdodpeypbqnofx Al Nek Max. plate thickness with prebending at D=5x top roll: 6 mm Max. plate thickness with prebending at D=1.5x top roll: 5 mm Top roll diameter: 240 mm Bottom roll diameter: 240 mm Side roll diameter: 190 mm Working height: 825 mm Motor power: 11 kW Length: 4,880 mm Width: 1,160 mm Height: 1,200 mm Weight: 6,450 kg 4 rolls PLC Fully hydraulic drive for top and bottom rolls (from 30 mm bending capacity for all four rolls) via planetary gear Hydraulic side roll adjustment with electronic synchronization Hydraulic bottom roll adjustment with mechanical synchronization Adjustable clamping pressure Variable rolling speed Hardened rolls Cone bending device Hydraulic drop-end Movable control panel Overload protection Operating manual in GERMAN and ENGLISH Equipment according to CE regulations OPTIONS: Top and side plate supports NC control IMPORTANT POINTS FOR CONICAL BENDING: The max. plate thickness is 50% of the rated capacity The cone length must be max. 30% or more than 60% of the roll length Hardened rolls are recommended

Stanje: novo, Condition: new Delivery time: approx. 12 - 14 weeks from order Country of origin: Turkey Price: €95,000 Leasing rate: €1,795.50 Bending length: 3,100 mm Max. bending capacity (mild steel): 13 mm Max. sheet thickness without pre-bending (mild steel): 12 mm Max. sheet thickness with pre-bending (mild steel): 8 mm Max. sheet thickness without pre-bending at D=5x top roll: 13 mm Max. sheet thickness without pre-bending at D=1.5x top roll: 10 mm Max. sheet thickness with pre-bending at D=5x top roll: 10 mm Max. sheet thickness with pre-bending at D=1.5x top roll: 8 mm Top roll diameter: 270 mm Bottom roll diameter: 270 mm Side roll diameter: 230 mm Max. opening: 50 mm Working height: 1,155 mm Motor power: 15 kW Length: 5,310 mm Width: 1,660 mm Height: 1,590 mm Weight: 10,050 kg 4 rolls PLC Fully hydraulic drive of top and bottom rolls (from 30 mm bending capacity on all four rolls) via planetary gearbox Kjdpfxeypbqhj Al Njdk Hydraulic side roll adjustment with electronic synchronization Hydraulic bottom roll adjustment with mechanical synchronization Adjustable clamping pressure Variable roll speed Hardened rolls Cone bending device Hydraulic drop-end bearing Movable control panel Overload protection Operating manual in GERMAN and ENGLISH Equipment in accordance with CE regulations OPTIONS: Top and side sheet support NC control IMPORTANT NOTES FOR CONE ROLLING: The max. sheet thickness is 50% of the nominal capacity The cone length must be max. 30% or more than 60% of the roll length Hardened rolls are recommended

Stanje: novo, Condition: new Delivery time: approx. 12 - 14 weeks from order Country of origin: Turkey Price: €62,600 Leasing rate: €1,183.14 Bending length: 2,050 mm Max. bending capacity - steel: 13 mm Max. plate thickness with pre-bending - steel: 10 mm Max. plate thickness without pre-bending at D=5x top roll: 13 mm Max. plate thickness without pre-bending at D=1.5x top roll: 10 mm Max. plate thickness with pre-bending at D=5x top roll: 10 mm Max. plate thickness with pre-bending at D=1.5x top roll: 8 mm Top roll diameter: 240 mm Bottom roll diameter: 240 mm Side roll diameter: 190 mm Working height: 820 mm Motor power: 11 kW Length: 3,830 mm Width: 1,160 mm Height: 1,200 mm Weight: 5,000 kg 4 rolls PLC Fully hydraulic drive for top and bottom rolls (for bending capacity ≥ 30 mm, all four rolls driven via planetary gear) Hydraulic side roll adjustment with electronic synchronization Hydraulic bottom roll adjustment with mechanical synchronization Adjustable clamping pressure Variable rolling speed Hardened rolls Cone bending device Hydraulic drop-end Movable control panel Overload protection Operating manual in GERMAN and ENGLISH Equipment in compliance with CE regulations Kdodsypbqbopfx Al Nek OPTIONS: Upper and side sheet supports NC control IMPORTANT POINTS FOR CONICAL BENDING: Max. sheet thickness is 50% of the nominal capacity The cone length may be max. 30% or must be more than 60% of the roll length Hardened rolls are recommended

Stanje: novo, Condition: New Delivery time: approx. 2 weeks from order Country of origin: Italy Bending length: 2000 mm Max. bending capacity – mild steel: 11 mm Max. sheet thickness without pre-bending at D=5x top roll: 11 mm Max. sheet thickness without pre-bending at D=1.3x top roll: 7 mm Max. sheet thickness with pre-bending at D=5x top roll: 8 mm Max. sheet thickness with pre-bending at D=1.3x top roll: 6.4 mm Top roll diameter: 225 mm Lower roll diameter: 215 mm Side roll diameter: 165 mm Rolling speed: 8 m/min Length: 3950 mm Width: 1200 mm Height: 1200 mm Weight: 4450 kg Hardened and polished rolls Siemens PGS-Classic numerical control with touchscreen Cone bending with electronic control and tilting lower roll Oil cooler Simultaneous rotation and rolling movement Simultaneous movement of rolls and supports Ability to bend variable radii (ovals, ellipses, etc.) Hydraulic micro-positioning via PLC for greater accuracy Stepless variable speed for the rolling movement Stepless variable speed for rotation Prepared for retrofitting with supports (up to 5 axes) Prepared for retrofitting with loading/unloading stations Prepared for retrofitting with CNC controls Extra-large, double-mounted swing bearing Electronic parallelism system for roll synchronization Hydraulic top roll lifting (for models with top roll diameter from 205 mm) Double linear guideway for lower roll movement Ultra-wide roll blocks "MCS" bearing system for lower rolls (4 large bearings per shaft) Centralized lubrication system Pressure gauge for constant clamping roll control Extra torque and special braking system Emergency stop safety pull cord Equipped according to "CE" regulations OPTION: Siemens PSG-Absolute CNC control with 15" touchscreen Kdodpfxeypbp Re Al Nek (automatic calculation of cycle for simple and complex shapes)

Stanje: novo, Condition: New Delivery time: approx. 12 - 14 weeks from order Country of origin: Turkey Price: €83,800 Leasing rate: €1,583.82 Bending length: 2,550 mm Max. bending capacity - structural steel: 15 mm Max. sheet thickness without pre-bending at D=5x top roll: 15 mm Max. sheet thickness without pre-bending at D=3x top roll: 13 mm Max. sheet thickness without pre-bending at D=1.5x top roll: 12 mm Max. sheet thickness with pre-bending at D=5x top roll: 12 mm Max. sheet thickness with pre-bending at D=1.5x top roll: 10 mm Top roll diameter: 270 mm Bottom roll diameter: 270 mm Side roll diameter: 230 mm Max. opening: 50 mm Working height: 1,155 mm Motor power: 15 kW Length: 4,760 mm Width: 1,660 mm Height: 1,155 mm Weight: 8,950 kg 4 rolls PLC control Fully hydraulic drive of top and bottom rolls (from 30 mm bending capacity for all four rolls) via planetary gearbox Hydraulic side roll adjustment with electronic synchronization Hydraulic bottom roll adjustment with mechanical synchronization Adjustable clamping pressure Variable rolling speed Kdjdpfx Aljypbp De Njk Hardened rolls Cone bending device Hydraulic drop-end bearing Mobile control panel Overload protection Operating manual in GERMAN and ENGLISH Equipment compliant with CE regulations OPTIONS: Upper and side sheet supports NC control system IMPORTANT NOTES FOR CONICAL ROLLING: The max. sheet thickness is 50% of the nominal capacity The cone length can be max. 30% or must be more than 60% of the roll length Hardened rolls are recommended

Stanje: pripravljen za uporabo (rabljen), Funkcionalnost: popolnoma funkcionalen, vrsta upravljanja: Krmiljeno s PLC krmilnikom, 3-valjna valjarska stiskalnica Proizvajalec: FERRO S.R.L. Model: CIT - 1 z digitalnim prikazovalnikom za 3 osi Delovno območje: 2000 x 6 mm Hidravlična zložljiva opora za menjavo obdelovanca Upravljalna plošča Nujna zaustavitev preko vlečnega kabla Kdodpfx Aloyw S E He Nsk Stanje: dobro / takoj pripravljena za uporabo

Leto izdelave: 1987, stanje: pripravljen za uporabo (rabljen), Na voljo je trivaljna krivilna stiskalnica za pločevino Kramer. Delovna širina: 2000 mm, največja debelina pločevine: 3 mm, moč: 3 kW. Možen je ogled na lokaciji. Ksdpeyttv Refx Al Nedk

Stanje: novo, Leto izdelave: 2025, premer spodnjega valja: 95 mm, premer zgornjega valja: 95 mm, premer stranskega valja: 95 mm, dolžina valja: 1.070 mm, najv. debelina jeklene pločevine: 3 mm, Oprema: dokumentacija / priročnik, naprava za krivljenje stožcev, nožno daljinsko upravljanje, nujno zaustavitev, zavrtljivi zgornji valj, - Capacity 1070 x 3 mm - Conical rolling - Swing-out top roller - Foot pedal control - Braked motor - Emergency stop - Documentation - 400V Kdjdswhgm Tepfx Al Nok

Stanje: novo, Isitan Hydraulic 4-Roller Plate Bending Machine Model: 4R HMS 2050x200 - 2 speeds - Driven top and bottom rollers - Hydraulic adjustment of side rollers - 3 digital displays - Hydraulic drop-end bearing - Hardened rollers - Cone bending device - Separate control panel Working length: 2050 mm Top roller diameter: 200 mm Side roller diameter: 180 mm Total motor power: 5.5 kW Working speed: 3 m/min – 6 m/min Weight: 3750 kg Dimensions (mm): 3850 x 1350 x 1290 (L x W x H) Bending Performance Data 10 mm thickness with minimum inside diameter of 1000 mm (5 x top roller) 8 mm thickness with minimum inside diameter of 300 mm (1.5 x top roller) Pre-bending Performance Data 8 mm thickness with minimum inside diameter of 1000 mm (5 x top roller) 6 mm thickness with minimum inside diameter of 300 mm (1.5 x top roller) Kodpfxjh Ar Dus Al Nedk All bending capacities are calculated based on material with 250 N/mm² yield strength Material: ST 37 - ST 42 structural steel

Stanje: zelo dobro (rabljeno), Leto izdelave: 2012, Tehnični podatki: Delovna širina: 2600 mm Kdjdjx Ii Hvspfx Al Nsk Zmogljivost upogibanja: 20,0 mm Pred-upogib: 16,0 mm Premer zgornjega valja: 330 mm Premer srednjega valja: 300 mm Premer stranskih valjev: 240 mm Stožčasta naprava za upogibanje z nagibom obeh stranskih valjev Premična upravljalna konzola z digitalnim prikazom Moč motorja: 11 kW Oznaka CE Dimenzije (dolžina x širina x višina): pribl. 5800 x 2300 x 1900 mm Teža: pribl. 11 t Dodatna oprema: Zgornja pomoč pri upogibanju Prodajalec ne odgovarja za morebitne napake pri pisanju ali prenosu podatkov. Stroj je po videzu, tehniki in obrabi primeren svoji starosti; rabljeni stroji se prodajajo brez kakršnegakoli jamstva.

Stanje: zelo dobro (rabljeno), Leto izdelave: 2010, Tehnični podatki: Delovna širina: 6500 mm maks. zmogljivost upogibanja: 7,0 mm maks. pred-upogib: 5,0 mm CNC krmiljenje Premer zgornjega valja: 420 mm Premer stranskih valjev: 315 mm Premer srednjega spodnjega valja: 400 mm Stožčasta upogibna naprava z nagnjenim položajem obeh stranskih valjev Premični upravljalni pult z digitalnim prikazom Hidravlični odmični ležaji CE oznaka Moč motorja: 22 kW Mere (dolžina x širina x višina): pribl. 9200 x 2350 x 1900 mm Lastna teža: pribl. 39 ton Kdsdpfx Ajx Iitijl Nsk Dodatna oprema: Stranski upogibni pomočnik Zgornji vrtljivi upogibni pomočnik Stanje: Zelo dobro ohranjeno, malo rabljeno Delovne ure: 100 h Prodajalec ne odgovarja za napake pri pisanju ali prenosu podatkov. Stroj je po videzu, tehnologiji in obrabi ustrezen starosti; rabljeni stroji se prodajajo brez kakršnegakoli jamstva.

Stanje: novo, HR300 Rogi mini roller Rolling capacity ----- 1 mm Kodpoga Tzbofx Al Nodk Working length ----- 300 mm Roller diameter ----- 30 mm Weight ----- 10 kg

Stanje: generalkompletno obnovljen (rabljeno), BIEGERUNDWALZMASCHINE ROUNDO BLECHLÄNGE: 2500 mm BLECHDICKE: 30/25 mm Ksdpohx N Ukofx Al Njdk 3 WALZEN GEWICHT: 19.000 kg

Leto izdelave: 2004, stanje: rabljeno, Funkcionalnost: popolnoma funkcionalen, Stroj za razrez in 2D krivljenje aluminijastih cevi debeline 7 in 8 mm. Kedoyt Sp Nopfx Al Nodk

Stanje: zelo dobro (rabljeno), Funkcionalnost: popolnoma funkcionalen, Leto izdelave: 2010, vrsta upravljanja: ročni, stopnja avtomatizacije: polavtomatski, vrsta aktuacije: električni, število valjev: 3, premer spodnjega valja: 90 mm, premer zgornjega valja: 90 mm, dolžina valja: 1.100 mm, delovna širina: 1.030 mm, najv. debelina pločevine: 3 mm, najv. debelina jeklene pločevine: 3 mm, maks. debelina pločevine iz nerjavečega jekla: 2 mm, skupna masa: 440 kg, skupna dolžina: 1.750 mm, skupna širina: 650 mm, skupna višina: 1.100 mm, moč: 1,5 kW (2,04 KM), vhodna napetost: 400 V, Oprema: kaljeni valji, naprava za krivljenje stožcev, nožno daljinsko upravljanje, nujno zaustavitev, zavrtljivi zgornji valj, Stroj za upogibanje pločevine DURMA MRB E 1030/3mm v odličnem stanju naprodaj. Proizvajalec: Durma MRB-E 1003 Letnik: 2010 Število valjev: 3 Premer zgornjega valja: 90 mm Dolžina valjev: 1030 mm Visoko trdni jekleni valji s SAE 1050 certifikatom kakovosti - Žične utore na koncih valjev (4/6/9 mm) Oznaka CE Kdedpfeyzrcgox Al Njk Stožčasti valji Odprta zgornja valja Zadnji in spodnji valj ročno nastavljiv Upravljanje: nožna pedala Moč motorja: 1,5 kW z zavoro in reduktorjem Električni priključek: 400 V Okvir iz litega železa Teža stroja: 440 kg Dolžina: 1750 mm Širina: 650 mm Višina: 1100 mm

Stanje: dober (rabljeno), Leto izdelave: 1991, številka stroja/vozila: 9108, Ponudba 26001 Tehnični podatki: - horizontalni + vertikalni delovni položaj - 3 motorizirani pogonski valji - hidravlično nastavljanje levega spodnjega valja - pritisk hidravličnega cilindra: 4 t - premer osi: 35 mm - hitrost vrtenja osi: 11 o/min - premer valjev: 132 - 142 mm - pogon: 400 V, 1,1 kW Kdodpfey Dqn Tsx Al Njk - zmogljivost upogibanja cca: - okrova cev Ø 800: 60 x 1,5 mm - ploščato železo Ø 400: 90 x 15 mm - kvadratno železo Ø 400: 30 mm - oprema: - ločena upravljalna konzola z digitalnim prikazom - električno nožno stikalo v ločenem upravljalnem pultu za desno/levo vrtenje - standardni komplet za upogibanje ploščatega in kotnega materiala - 6 kompletov valjev za cevi: 22, 28, 33, 42, 48 in 60 mm - teža cca: 450 kg - potrebni prostor cca: Š 700 x V 1150 x G 950 mm

Stanje: novo, Dolžina upogibanja: 2100 Debelina pločevine: 45 Upogib: 35 Premer zgornjega valja: 430 Stranski valj: 390 Motor: 30 Dimenzije (DxŠxV): 5200 x 2200 x 2500 Teža cca: 19000 Tehnični podatki: - Kaljeni in polirani valji - Celotno ohišje iz ST-52 jekla - Naprava za stožčasto krivljenje - Digitalni prikaz za stranske valje - Prenosna kontrolna konzola - Valji so montirani na ležajih Kdsdpfxsytyy No Al Nek - Pokrov zgornjega valja, hidravlično odpiranje in zapiranje preko nadzorne plošče - Vse valje poganja hidravlični motor in planetno gonilo - Stranski premiki poganjani hidravlično

Stanje: dober (rabljeno), Leto izdelave: 2009, številka stroja/vozila: 673309012, Ponudba 26121 Tehnični podatki - 2 pogonska valja, vsak valj hidravlično nastavljiv - za ukrivljanje in valjanje stožcev, stranski loki izhodni - upravljanje preko ločenega upravljalnega pulta z digitalnimi prikazi dejanske vrednosti - največja delovna širina: 2520 mm - največja debelina pločevine pri 400 N/mm² brez predkrivljenja: 20 mm - premer zgornjega valja: 325 mm - premer stranskega valja: 275 mm - premer spodnjega valja: 325 mm - delovna hitrost nastavljiva - pogon: 400 V / 22 kW - potrebni prostor: pribl. Š 4900 x V 1700 x G 1900 mm - masa stroja: pribl. 12000 kg - z: napravo za stožčasto upogibanje Kodpfx Aloy A I Sye Nedk - stranske podporne roke hidravlično pomične

Stanje: novo, Leto izdelave: 2026, For professional use Easy cleaning and maintenance Simple operation Four different filling attachments Filling speed control Knee switch Kodpfepxm E Ajx Al Nodk Fast return Easy to move thanks to fixed castors 4 different forming tubes, diameters 14, 20, 30, and 36 mm Additional equipment: Cylinder for hamburger production, PVC sausage filling cylinder for Čevapcici

Stanje: dober (rabljeno), Leto izdelave: 2011, številka stroja/vozila: 4315002, Offer 26087 Technical Data: - CNC control PS 210 for automatic material feed, - Cutting speed, cutting pressure - Separate manual operation of all functions without CNC control - Saw band dimensions: 4150 x 27 x 0.9 mm - Cutting speed: steplessly adjustable from 15 to 105 m/min - Cutting pressure adjustment: stepless from 0.2 to 2.0 m/min - Cutting capacity: - at 90° round: 320 mm - rectangular/flat: 400 x 280 mm - at 45° round: 200 mm - at 30° right round: 170 mm - Left and right mitre adjustable with digital display - Min / max cut-off length for automatic material feed - with single stroke: 2 / 1005 mm - Total drive power: 400 V / 3.0 kW - Minimum-quantity coolant spray system, pneumatically assisted - Hydraulic saw band tensioning & motorised saw band brush - 2 pcs original roller conveyor, each 2000 mm Kodpfx Aoy Aufgel Nsdk - Required space approx.: W 4200 x H 1650 x D 2450 mm - Weight approx.: 2900 kg

Stanje: rabljeno, Leto izdelave: 2011, skupna dolžina: 3.700 mm, skupna širina: 1.200 mm, skupna višina: 1.200 mm, Poids à vide : 2 000 kg Prix : Sur demande - Année de fabrication : 2011 - Documentation disponible : Non - Marquage CE présent : Oui - Certificat CE disponible : Non - Numéro de série : 363/11 - Commande : CNC - Entraînement : Hydraulique - Nombre de rouleaux [pcs] : 4 Kdodpey Ak Tgofx Al Nok - Nombre de rouleaux entraînés [pcs] : 4 - Épaisseur maximale de tôle [mm] : 5 - Largeur de travail maximale [mm] : 1500 - Diamètre du rouleau supérieur [mm] : 130 - Diamètre des rouleaux inférieurs [mm] : 150 - Options : Cintrage conique - Dimensions de transport : 3700mm x 1200mm x 1200mm (L x l x h) - Poids transport [kg] : 2000kg - Paquets de transport [pcs] : 2 Informations financières TVA : Le prix indiqué s'entend hors TVA TVA/Régime de marge : TVA déductible pour les entreprises Livraison et reprise possible à tout moment pour tout équipement industriel Lukas van Rossum