Stroj Za Obločno Varjenje Za Spajanje nakup rabljenega (86.807)

Stanje: dober (rabljeno), nazivna moč pri 50-odstotnem delovnem ciklu: 8 kVA, - Kapaciteta 8 kVA - Časovni rele Ijdpfovbr Dlsx Ab Aotg - 380V

Stanje: dober (rabljeno), nazivna moč pri 50-odstotnem delovnem ciklu: 100 kVA, – Moč 100 kVA – Pnevmatski Iodpfxjxc Nx Eo Ab Astg – Izmet 900 mm – Upravljanje Bosch PSP 2000 – 380 V

Stanje: novo, Leto izdelave: 2024, Funkcionalnost: popolnoma funkcionalen, vhodna napetost: 400 V, vrsta vhodnega toka: trifazni, Inovativni stroj za zavarivanje trakom, tipa flash butt, namijenjen za trakaste pile i bimetalne listove, u potpunosti je razvijen od strane našeg inženjerskog odjela. Jamči savršene zavare i preciznu ponovljivost procesa. Intuitivan zaslon osjetljiv na dodir proizvođača Schneider Electric omogućuje jednostavno i besprijekorno upravljanje strojem. Proces zavarivanja je u potpunosti automatiziran, uz mogućnost podešavanja električne struje u 6 stupnjeva. Stroj također pruža kontinuiranu regulaciju električne struje tijekom žarenja te pirometrijsku kontrolu tijekom cijelog procesa zavarivanja. FBM10 je izuzetno jednostavan za postavljanje i vrlo ekonomičan za održavanje. Napon napajanja: 400V Nazivna snaga transformatora pri 50% radnog ciklusa: 5 kVA Frekvencija struje: 50 Hz Stezanje lista pile: Ručna ili hidraulična stega /Opcija FBM 10.02/ Žarenje: Ručni ili automatski način sa pirometrijskom kontrolom /Opcionalno/ Jezik izbornika: Bg / En / Mogućnost zavarivanja: Itodpfxjxhf Dze Ab Ajg - trakasti listovi pile za drvo: 6–60 mm - bimetalni trakasti listovi pila: 6–54 mm - trakasti listovi od nehrđajućeg čelika: 6–40 mm - trakasti listovi bez zuba: 6–50 mm Težina: 197 kg Dimenzije (D x Š x V): 910 x 640 x 530 mm

Stanje: dober (rabljeno),

Stanje: novo, Leto izdelave: 2026, stiskalna sila: 25 t, Oprema: dvostranski, The Marinus Powermax Finger Jointer Line profiles horizontally, applies adhesive, removes defects, presses, and cuts to length. This unique process creates a clean joint that requires no further finishing. About the Finger Jointer When feeding wood into the machine, defects such as knots or cracks can be marked with a fluorescent wax crayon. The machine removes these defects, including the marked lines. For example, to produce claddings or panels free from knots or holes. Prior to profiling and pressing, the wood is positioned statically, laterally secured, and clamped precisely against a reference surface at the top. This ensures an extremely accurate finger joint connection with a smooth surface at the joint and a straight finished product. Due to this precision, the wood (for most applications) does not require further planing or sanding. The adhesive applicator is mounted on the carriage with the profile cutters. During the return stroke of the profiling carriage, adhesive is applied. Using PU adhesive ensures a highly durable bond, suitable for outdoor use and damp environments. While most other finger jointing machines feed the wood transversely (at a right angle) past the profiling heads, the Marinus Finger Jointer moves the wood longitudinally through the machine. This allows for the processing of long lengths up to 6 meters or more. As a result, the machine can process all of the wood, including longer lengths, and fully utilize it (except for the defects) in the finger-jointed final product. This way, quality wood is not turned into short waste pieces. Whereas other finger jointers focus on recycling short offcuts, the Marinus eliminates the production of offcuts. The Marinus Finger Jointer contributes to an efficient and sustainable manufacturing process. Ijdpfxsp R Iwho Ab Aetg Technical Data: Feed lengths: 450 – 6000+ mm Feed widths: 50 – 300 mm Feed thicknesses: 8 – 50 mm Length modes: Variable / Fixed Capacity: Up to 8 joints/min This machine is designed and manufactured at our facility in the Netherlands and will be supplied new ex works. The machine is equipped with an online remote maintenance system. We provide worldwide customer support. This offer on Machineseeker was also created by us: Marinus Machinery.

Stanje: dober (rabljeno), Funkcionalnost: popolnoma funkcionalen, We offer for sale a complete SCHLATTER multi-point automatic steel wire welding line. Itjdpfetvpilox Ab Ajg We have three fully operational production lines available. Automatic machines for the production of cross wires (so-called straightening and cutting machines) are also available. Additionally, we have a wide selection of individual spot welders for steel wires.

Stanje: rabljeno, Leto izdelave: 2006, Funkcionalnost: popolnoma funkcionalen, Fisher+Rueckle EM-28 rob za ojačanje i obrezivanje rubova edgemaster, godina proizvodnje 2006, na prodaju! Dužina furnirske trake: 420 - 2800 mm Širina furnirske ploče (poprečna vlakna): 400 - 4200 mm Debljina furnirske trake (uključujući obrezivanje): 0,3 - 1,5 mm Debljina furnirske trake: 0,3 - 2,0 mm Brzina proizvodnje (kontinuirana): 15 - 35 m/min Odrezivanje sa svake strane: 10 - 350 mm Širina trake (papira): 6 mm Debljina trake (papira): 0,16 mm, tip CP-99 Kolut (unutarnji i vanjski promjer jezgre): ∅ 75 mm, ∅ 325 mm Širina koluta: 65 mm Duljina trake na kolutu: 3200 m Električna energija: 1,1 kW Komprimirani zrak: 6 bar Potrošnja komprimiranog zraka: 5 NL/min Itjdeumrgajpfx Ab Aeg

Stanje: novo, Leto izdelave: 2025, STARWELD PCB-SA je visokozmogljiva mrežna varilna linija za izdelavo srednje težke in težke žice ali ojačitvenih mrežastih plošč iz predhodno poravnanih in vnaprej odrezanih palic. Je bolj varčna in bolj poceni varilna linija v primerjavi z linijami za obdelavo žic iz tuljav; zaradi tega je STARWELD PC-SA primerna linija, kadar je na voljo manj prostora. Zasnova je narejena v skladu s specifičnimi parametri tipa projekta in mreže. PRATTO lahko dobavi vso potrebno pomožno opremo. Izdelki se lahko uporabljajo v gradbeni industriji. Uporabljajo se tudi za police, rešetke, kletke, palete in posode, pa tudi za ograje (navadne in upognjene). Itjdpjf Ar N Usfx Ab Aog

Stanje: rabljeno, Leto izdelave: 2009, Funkcionalnost: popolnoma funkcionalen,

Stanje: novo, Leto izdelave: 2025, Butt-Schweißmaschine Technische Daten: Modell: KAB10 CE-zertifiziert Bedienung: Fußpedal Leistung bei 50% ED: 10 kVA, Dauerleistung: 7,1 kVA Schweißkapazität: bis 8 mm + 8 mm Stahldraht (unlegiert) Primärwicklung: Kupferdraht Sekundärwicklung: Kupferschiene Kern: Siliziumstahl-EI-Kern Itjdpstwfv Dofx Ab Asg Netzanschluss: 400V/50Hz Netzzuleitung: 3 m Schutzklasse: IP21 Platzbedarf (B/T/H): 625 mm x 600 mm x 1035 mm Gewicht: 90 kg Garantie: 1 Jahr (+10 Jahre Ersatzteilversorgung)

Stanje: novo, Leto izdelave: 2025, Točkovni varilni stroj tip KPP90 CE certificiran Pogon: Pnevmatski Potreben delovni zračni tlak: 8 bar Moč pri 50% ED: 90 kVA, neprekinjena moč: 63,5 kVA Varilna zmogljivost: 5+5 mm jeklene pločevine Konstrukcija vodno hlajenega transformatorja: Primarni navitje: bakrena žica Sekundarno navitje: bakrena letvica Jedro: Silicijevo-jekleno jedro EI Transformator prevlečen z epoksi smolo. Nastavljiva sila elektrode: 305-610 daN Omrežna priključitev: 400V/50Hz Zaščitna varovalka: 200A Nastavitev moči: 0-99 % nastavljivo preko digitalnega mikrokrmilnika Varilni čas: 1-99 ciklov (20 ms - 2 s) nastavljivo preko digitalnega mikrokrmilnika Dolžina krakov: 550 mm Potreba po hladilni vodi: 15 l/min Vhodni napajalni kabel: 3 m Razred zaščite: IP21 Potrebni prostor (Š/G/V): 450 mm x 1500 mm x 1750 mm Teža: 795 kg Itjdouy U E Hepfx Ab Aog Garancija: 1 leto (+10 let podpore rezervnih delov)

Stanje: novo, Leto izdelave: 2025, Stroj za točkovno varjenje tip KMP10 CE certificiran Isdpfx Asuy U Hqeb Astg Način delovanja: pnevmatski Potreben zračni pritisk: 4 bara Moč pri 50% ED: 10 kVA, neprekinjena moč: 7,1 kVA Varilna zmogljivost: 1,5+1,5 mm jekleni pločevini Konstrukcija transformatorja: Primarno navitje: bakrena žica Sekundarno navitje: bakrena fleksibilna folija Jedro: EI jedro iz silicijevega jekla Nastavljiva sila elektrode: 150–300 daN Priključek na električno omrežje: 220V/400V (50Hz) Zaščitna varovalka: 220V-40A / 400V-25A Nastavitev moči: 0–99% digitalno nastavljivo z mikrokrmilnikom Čas varjenja: 1–99 ciklov (20 ms – 2 s), nastavljivo z digitalnim mikrokrmilnikom Dolžina roke: 300 mm Zahteva hlajenja: vodno hlajenje (7 L/min) Dovod električnega kabla: 3 m Razred zaščite: IP21 Potreben prostor (Š/D/V): 400 mm x 800 mm x 550 mm Teža: 95 kg Garancija: 1 leto (+10 let zagotavljanja rezervnih delov)

Stanje: novo, Leto izdelave: 2025, Butt varilni stroj Tip KMB5 CE certificiran Ijdpfsq Rga Ssx Ab Astg Upravljanje: ročno Moč pri 50 % ED: 5 kVA, stalna moč: 3,5 kVA Zmožnost varjenja: do 5 mm + 5 mm jeklene žice Primarni navitje: bakrena žica Sekundarni navitje: bakrena letev Jedro: silikonsko-jekleni EI jedro Priklop na omrežje: 220V/50Hz Dovodni kabel: 3 m Razred zaščite: IP21 Prostorska zahteva (Š/G/V): 300 mm x 370 mm x 275 mm Teža: 38 kg Garancija: 1 leto (+10 let podpora rezervnih delov)

Stanje: novo, Leto izdelave: 2025, Tehnične specifikacije: Model: KMD20 Upravljanje: Motorizirano Vhodni tlak: do 6 bar Moč: 20 KVA Zmožnost varjenja: 1,5+1,5 mm navadno jeklo Največja sila (pri 6 bar): 115 daN Vhodna napetost: 380V/50Hz Zaščitna varovalka: 63A Dolžina roke za šivno varjenje: 200 mm Hlajenje: vodno hlajenje (8L/min) Dovod električnega kabla: 3 m Razred zaščite: IP21 Stopnja moči: 0–99 %, nastavljivo preko krmilnika Čas varjenja: 1–99 ciklov, nastavljivo preko krmilnika Itedpfx Abjtmfzue Asg Dimenzije (Š/D/V): 450 mm x 1000 mm x 600 mm Teža: 203 kg

Stanje: novo, Leto izdelave: 2025, Stroj za varjenje mreže / rešetke, tip KMP180 CE certificiran Pogon: Pnevmatski Tlak: 4–8 bar Moč: 180 kVA Itsdpouy U Hwofx Ab Aog Varilna zmogljivost (mreža/rešetka): (4+4 mm železo) 4 žice istočasno Konstrukcija transformatorja s hlajenjem z vodo: Primarni navitje: bakrena žica Sekundarni navitje: bakrena letev Jedro: silikonsko-jekleno EI jedro Transformator prevlečen z epoksi smolo Maksimalna sila: 305–610 daN Vhodna napetost: 380 V / 50 Hz Zaščitna varovalka: 300 A Nastavljiv nivo moči: 0–99 %, digitalni mikrokontroler Čas varjenja: 1–99 ciklov (20 ms – 2 s), nastavitev preko digitalnega mikrokontrolerja Dolžina roke: 550 mm Hlajenje: vodno hlajenje (30 l/min) Dovodni električni kabel: 3 m Razred zaščite: IP21 Mere (Š/D/V): 4500 mm x 3500 mm x 2150 mm Teža: 2850 kg

Stanje: novo, Leto izdelave: 2025, Tehnične specifikacije KHP60 G avtomatskega stroja za varjenje spiralnih zaščitnih rešetk ventilatorjev Način delovanja: Pnevmatski (bat gor in dol) Itsdpfjwvbxtjx Ab Aog Delovni tlak: do 8 barov Moč: 60 kVA Varilna zmogljivost: istočasno varjenje 4 žic debeline 5 mm + 5 mm Največja sila: 610 daN Vhodna napetost: 380V/50Hz Zaščitna varovalka: 200A Nastavljiva moč: 1-100 % (nastavljivo preko digitalnega mikrokrmilnika) Čas varjenja: 1-100 ciklov (20 ms – 2 s), nastavljivo preko digitalnega mikrokrmilnika Dolžina roke: 800 mm Hlajenje: vodno hlajenje (15 l/min) Dovodni kabel: 3 m Razred zaščite: IP21 Dimenzije (Š/D/V): 1100 mm x 2500 mm x 1750 mm Teža: 740 kg

Stanje: rabljeno, Automatic Reinforcement Mesh Welding Machine MCC001 This machine is designed for welding steel reinforcement meshes from pre-cut reinforcement rods in compliance with EN 10080. Technical data: Reinforcement rod diameter: 4 mm, 5 mm, 6 mm Number of longitudinal rods: 2 – 12 Length of longitudinal rods: 200 mm – 3000 mm Minimum distance between longitudinal rods: 100 mm Spacing between transverse bars: 10 mm – 999 mm Length of transverse bars: 100 mm – 1250 mm Itedpfxsymcpyo Ab Asg Mesh movement speed: 0.1 m/s – 1 m/s Clamping force: 60 kg – 190 kg Productivity: 1 cycle/min Electrical: Supply voltage: 400 V Supply frequency: 50 Hz Connection type: TN-C Total power: 100 kVA Maximum motor power: 0.8 kW Single welding transformer power: 35 kVa Pneumatics: Working medium: Compressed air Working pressure: 6 bar Air consumption: 250 l/min Cooling: Cooling type: Water cooling Circulation type: Forced circulation Maximum incoming coolant temperature: 35 °C Coolant consumption: 60 l/min

Stanje: rabljeno, Funkcionalnost: popolnoma funkcionalen, vhodna napetost: 380 V, električna varovalka: 16 A, nazivna moč pri 50-odstotnem delovnem ciklu: 4 kVA, neprekinjena (navidezna) moč: 6 kVA, V prodajo ponujamo rabljeni čelni / bliskovni varilni stroj IDEAL BAS 20, leto izdelave neznano. Tip: BAS 20 Serijska številka: 18292 Nazivna moč pri 50 % ED: 4 kVA Priključna moč: 6 kVA Napetost v prostem teku: 2,8–4 V Največja sila vtisnjenja: 0,25 Mp Debelina varjenja (jeklo): 3–50 mm Primarna napetost: 380 V Frekvenca: 50–60 Hz Varovalka: 16 A Število stopenj: 5 Ijdex Saxdepfx Ab Aotg Na voljo od aprila 2026 Za vprašanja ali dodatne informacije nam pošljite sporočilo ali nas pokličite.

Stanje: rabljeno, Leto izdelave: 2016, Industrial Automatic Edge Banding Machine SOLUTION XD MAIN FEATURES "E TOUCH" CONTROL WITH AUTOMATIC PROGRAMMING: OPERATE THE MACHINE WITH JUST ONE "TOUCH" STANDARD PRESSURE UNIT WITH DRIVE BELT FOR OPTIMAL PANEL GUIDANCE EDGE BANDING OF ROLL MATERIAL, STRIP EDGES, AND SOLID WOOD EDGES GENERAL FEATURES Single-sided edge banding machine in left-hand configuration for processing roll material and strip edges using all conventional hot-melt adhesives. The base frame consists of a robust welded steel stand with increased rigidity, providing optimal support for the processing units. The top pressure ensures a stable hold with a thick-walled steel profile and dual trapezoidal drive belt, which is automatically positioned according to panel thickness. Height adjustment with indicator at the top pressure and on the operator surface. Manual workpiece infeed system with large-scale work line and enlarged support area facilitates the insertion of large workpieces. Adjustable infeed fence with two positions and automatic selection for processing with or without pre-milling. Iodoxy Tm Iopfx Ab Ajtg Working units attached to the pressure beam and mechanically linked to ensure automatic setting when changing panel thickness. Lower working units attached to the machine frame or longitudinal beam for precise reference to the panel. All high-frequency motors are equipped with frequency inverters for optimal flexibility and improved production times; each unit is equipped with its own inverter. Extraction hood for all units positioned after the gluing station. Polycarbonate viewing windows provide a clear view of the units during processing. Interior lighting with sound-absorbing material for reduced noise emissions. Spacer at the infeed fence allows material to be fed into the machine at the correct distance. The distance adjusts automatically to the selected feed speed. Swiveling control panel, positioned at the infeed, is adjustable for ergonomic operation. The electrical system complies with current regulations. Electrical components are housed in a metal enclosure mounted on the machine frame, equipped with doors for convenient access during maintenance. Standard voltage is 400 V EU 50 Hz (with neutral conductor). Material feed is via a feed chain with 80 mm wide rubberized nylon chain plates for optimal guidance and high precision. The chain runs on two guides made of hardened and ground steel – one round and one flat – to ensure straight feeding and prevent lateral displacement. Automatic lubrication of the chain; the control system adjusts the amount of oil according to the number of processed panels. External roller conveyor positioned along the entire machine length; equipped with a retractable system extendable up to 650 mm (for panels up to 1200 mm maximum width). E-TOUCH PC control system enables fast and easy execution of main functions, including: – Processing of programs in "Just in Time" mode – Possibility of management via parts lists – Management options through ...

Stanje: rabljeno, Leto izdelave: 1996, Debelina roba: 0,4 - 12 mm Rob valja: 3 x 45 mm oz. 0,8 - 60 mm Minimalna širina obdelovanca: 65 mm Minimalna dolžina obdelovanca: 160 mm Debelina obdelovanca: 10 - 55 mm Podajanje: 13 m/min Predrezkanje (spajanje) Lepilna kad Quickmelt Lepilni del Obarjanje Poravnalno rezkanje Poševno rezkanje Polmerno rezkanje Kopiranje robov Ravno strgalo Polirni agregat Dimenzije stroja: 7450 x 1220 x 2400 mm Teža: 3000 kg Lokacija skladišča: Nattheim Isdpfx Abjvvkd Te Aotg

Stanje: rabljeno, Leto izdelave: 2009, HOLZ-HER edge banding machine CONTRIGA 1366 Itodpfx Abevvkfdj Aeg Edge thickness: 0.4–30 mm (depending on equipment) Edge height: 51/66 mm (depending on equipment) Panel thickness: 6–45/60 mm (depending on equipment) Edge types: Coil and strip material Feed speeds: Infinitely variable feed from 12–30 m/min (depending on equipment) Features: - Adjustable infeed table in magazine area (max. adjustment range 30 mm) - Height-adjustable magazine plate for lower edge overhang adjustment - Large magazine plate Ø 820 mm for edge rolls up to Ø 800 mm - Transport chain including automatic central lubrication - Motorized, position-controlled bridge height adjustment - Pneumatic locking roller for processing shortest workpiece intervals - Extendable workpiece support (extension up to 1600 mm) - Space-saving, pneumatically controlled sliding hoods over the complete machine (deviations possible for certain units) - Motorized infeed fence - Lubrication injector for all joints and pins (including hour counter) - Central extraction connection (2x Ø 200 mm) - Integrated chip collection box at machine end (in conjunction with radius scraper unit) Control PPC 231 - Power PC for efficient setup and changeover - 15" SVGA touchscreen display - CF memory card 128 MB - On-board USB port - Ethernet network interface - On-board keyboard connector - Windows-like user interface - Plain text and/or graphic information - Rotatable, tiltable control panel at eye level - Dust-proof membrane keypad with softkeys (push buttons) - LED indicator for unit preselection - Program list with program names and numbers - Comprehensive program memory - Individual unit selection with basic settings for setpoints, positions and tool corrections as well as fixed position points - Setup processes for units and axis adjustments centrally and clearly via fine adjustment (depending on equipment) - Interval display for shortest workpiece distance - Integrated distance control; positions controlled globally and/or program-specific - Comprehensive and complete operating data acquisition - Service messages in plain text - Diagnostic system - Integrated synchro-bus system for high-precision unit control - Individual management for up to ten users including password protection - Online maintenance (optional), data exchange with HOLZ-HER service - Barcode interface (optional) BASE MACHINE CONTRIGA 1366 - belt bridge Options and accessories for the base machine: Spray unit 1856 for entry and exit section: For infeed: Electronically controlled parting agent spray unit with Riepe-LPZ/II parting agent For outfeed: Electronically controlled cleaning agent spray unit with Riepe-LP163/93 cleaning agent (only in conjunction with jointing cutter unit 1961 and surface scraper 1964) Jointing cutter unit Jointing station 1803 (2x 2.6 kW, 200 Hz, 12000 rpm) With two electronically controlled cutter units - 1 unit counter-rotation - 1 unit co-rotation - 5 mm plunge depth - Static frequency inverter 200 Hz - Without router tool - With ProLock quick-change tool holder Tooling for 1803 (workpiece height up to 60 mm) Diamond cutters PRO UT, 2 pcs (front and rear), incl. protect. hoods Ø 100–63, Ø 30 mm, Z = 3 + 3 + 3, 1 left-hand, 1 right-hand Noise-reduced cutters with integrated chip guidance DFC technology (Leitz system) Max. chip removal: 2 mm at 60 mm workpiece height [Text continues] If you need the rest of the translation or a tailored summary, please let me know.

Stanje: rabljeno, Leto izdelave: 2002, Dolžina stroja: 6240 mm Teža: 2400 kg Priključna moč: 14 kW Premer odsesovanja: 120 / 140 mm Lokacija skladišča: Nattheim Iodpfx Asvvkfweb Aotg

Stanje: rabljeno, Leto izdelave: 2011, pnevmatska nastavitev rezkarja (ravno/radij) Kombinirana rezkarska postaja R=2 Rezkar zaokroževanja robov R= 2 do 40 mm Spojni rezkar do 40 mm Ravno strgalo Profilno strgalo R = 2 Kratki obdelovanci SPS krmiljenje z zaslonom na dotik Pro Face Gnezdenje Hlajenje/antistatično pršenje - airtronic Zaščitno pršenje roba Riepe z vključenim zamenljivim rezervoarjem Debelina obdelovanca 8 - 60 mm Mehanska pritrditev roba Odvzemna odprtina: 140 mm Dimenzije: Dolžina z izpostavo: 4984 mm Globina z valjčno mizo: 1425 mm Največja višina: 1618 mm Višina delovne mize: 888 mm Teža: 1400 kg Lokacija skladišča: Nattheim Isdpjxyiilofx Ab Aotg

Stanje: rabljeno, Leto izdelave: 2022, vklj. 2. lepilni bazen Debelina lepljenja za valjasto robno: 0,4 - 3 mm Debelina lepljenja za trakasto robno: 5 mm Min - maks. višina obdelovanca: 8 - 50 mm Podajalna hitrost: 9 m/min. Predrezalna enota Lepilna enota Odkrajševalna enota Zaoblitvena enota Poravnalna rezkalna enota Radijska strgala Ploska strgala Polirna enota Razpršilna naprava Itsdpfxsw Aig Sj Ab Aeg Lokacija skladišča: stranka

Stanje: rabljeno, skupna širina: 800 mm, skupna višina: 1.600 mm, skupna dolžina: 1.200 mm, Lastna teža: 500 kg - Dokumentacija na voljo: Ne - CE-certifikat priložen: Ne - Serijska številka: 4234 - Izvedba: Pnevmatska - Moč [A]: 450 - Moč [kVA]: 50 - Transportne mere: 1200mm x 800mm x 1600mm (d x š x v) - Transportna teža [kg]: 500 kg Itodpfx Aowyktnsb Aeg - Število transportnih paketov [kos]: 1 Finančne informacije DDV: Naveden cena je brez DDV DDV/Obdavčitev po razliki: DDV je odbiten za podjetja Dostava in prevzem v račun sta možna kadarkoli za vse iz industrijskega področja Lukas van Rossum