Kullanılmış Tek Yaprak Sistemi Kanal Transactiona satın al (24.643)

Koşul: ikinci el, makine/araç numarası: 008030, Takılan kenar tipi: ince kenar, kalın kenar, masif ahşap Yapıştırma sistemi: EVA, PUR, sıcak hava Birleştirme frezeleme: evet Çok fonksiyonlu ünite: evet Maks. ilerleme hızı: 25 m/dak Maksimum levha kalınlığı: 60 mm Çalışma üniteleri: 8 adet Bodpfx Aowvq Hgjlmslg

Koşul: ikinci el, makine/araç numarası: 008417, Uygulanan kenar tipi: ince kenar, kalın kenar Yapıştırma sistemi: EVA Birleştirme frezelemesi: evet Çok fonksiyonlu ünite: evet Maks. ilerleme hızı: 12 m/dak Maksimum levha kalınlığı: 60 mm Bledsy D Af Djpfx Almsg Çalışma üniteleri: 7 adet

Koşul: ikinci el, Üretim yılı: 2006, Fonksiyonellik: tamamen fonksiyonel, giriş voltajı: 400 V, giriş frekansı: 50 Hz, giriş akımı türü: trifaze, emme vakumu (maks.): 2.400 mbar, emme kapasitesi: 6.000 m³/saat, emme manifoldu çapı: 300 mm, filtre alanı: 30 m², toplam yükseklik: 2.350 mm, toplam uzunluk: 3.000 mm, toplam genişlik: 1.100 mm, toplam ağırlık: 900 kg, Toz emişi, talaş emişi, kendini temizleyen pnömatik vakum filtresi Alko Mobil Power JET 300 Filtre, çalışma sırasında basınçlı hava darbeleriyle pnömatik olarak temizlenir, bu sayede cihazın verimliliği yüksektir. Fan temiz hava tarafında yer aldığından patlama riski minimuma indirilmiştir. Geniş bantlı zımpara makineleri ve her türlü kuru tozun farklı proseslerde uzaklaştırılması için idealdir. Fan gücü: 7.5 kW Kapasite: 6000 m3/s Bjdpfx Aley A Iwcjmjlg Vakum: 2400 Pa Bağlantı çapı: 300 mm Hava geri dönüşü Stok No: 1130

Üretim yılı: 2022, Koşul: yeni, Ekipman: Kırma makinesi Kullanım için uygun: İnşaat makineleri Bledspa Rpfepfx Almeg

Üretim yılı: 2023, Koşul: yeni, Uzunluk: 60 cm Kullanım için uygun: İnşaat makineleri Bledpfx Alspq Tbusmog Yükleme alanı kapasitesi: 500 l Garanti: 6 ay

Koşul: ikinci el, 🔥 For Sale: HDG Compact 15–50 kW Biomass Boiler – Flexible and Compact Wood Chip Heating System 🔥 The HDG Compact 15–50 kW is a versatile biomass boiler – ideal for residential properties, small commercial premises, or agricultural applications. It is suitable for operation with wood chips and pellets, offers modular output, and fully automatic operation in a space-saving design. ⸻ Key Features: 🌲 Fuel: Wood chips or pellets ⚡ Output: 15–50 kW 🧠 Fully automatic ignition, feeding, and cleaning 🔧 Compact construction – ideal for technical rooms with limited space 🇩🇪 HDG Bavaria – Precision biomass technology made in Germany 📍 Location: Hungary, 9200 Mosonmagyaróvár, Kötöttárugyári út 22 (ProfiKazán) ⸻ 💼 Top Heating Systems – ProfiKazán Compact biomass heating systems with maximum flexibility. TOP HEATING SYSTEMS – Used heating systems, boilers, heat pumps & accessories direct from stock We are a family-run company with around 20 years of experience in heating technology and a 1,500 m² warehouse in Mosonmagyaróvár, Hungary, with a constantly available stock of approx. 50–60 units. 📍 Location: Our warehouse is located in Mosonmagyaróvár, Hungary – about 15 km from the Austrian border and around 80 km from Vienna. Mosonmagyaróvár is the first major town on the Hungarian side after the Austrian border. 🔥 Our product range includes, among others: • Wood chip boilers • Pellet boilers • Wood gasification boilers • Log wood boilers • Biomass boilers • Oil and gas boilers • Heat pumps • Thermal ventilators • Hot air blowers Bsdpfxowahhvs Almslg • Warm air heaters • Industrial heaters • Buffer tanks • Heat exchangers • Feed augers • Fuel extraction systems • Burners • Pumps • Extensive heating accessories ⚙️ Accessories and Components: In addition, we offer a wide range of accessories including circulation pumps, plate heat exchangers, and many other components – from private applications to industrial scale. 🏭 Brands in our range: Fröling, Hargassner, KWB, HDG, Binder, ETA, Herz, Guntamatic, Windhager, Viessmann, Buderus, and many more. 🌐 Latest offers: Most of our current offers can be found on our website: topheatingsystems.com Additionally, we have further equipment that is not yet listed online. 📅 Viewing: A visit to our warehouse is possible by prior appointment. If you are interested, please contact us – we will help you find the right solution.

Koşul: ikinci el, 🔥 For Sale: Fröling P4 3–15 kW Pellet Boiler – Fully Automatic & Quiet Operation for Residential Buildings 🔥 The Fröling P4 3–15 kW is a high-quality, fully automatic pellet boiler – ideal for modern homes, passive houses, and well-insulated buildings. It offers whisper-quiet operation, minimal maintenance requirements, and outstanding energy efficiency. ⸻ Key Features: 🌾 Fuel: Wood pellets ⚡ Output: 3–15 kW Bjdewah Sbopfx Almslg 🧠 Fully automatic feed, ignition, and cleaning system 🔧 Integrated controller, low-noise operation 🇦🇹 Fröling – Premium pellet technology from Austria 📍 Location: Hungary, 9200 Mosonmagyaróvár, Kötöttárugyári út 22 (ProfiKazán) ⸻ 💼 Top Heating Systems – ProfiKazán Efficient heating systems for buildings with low energy demand. TOP HEATING SYSTEMS – Used heating systems, boilers, heat pumps & accessories direct from stock We are a family business with around 20 years of experience in heating technology. Our 1,500 m² warehouse in Mosonmagyaróvár, Hungary, maintains a steady stock of approx. 50–60 units available at all times. 📍 Location: Our warehouse is located in Mosonmagyaróvár, Hungary – about 15 km from the Austrian border and around 80 km from Vienna. Mosonmagyaróvár is the first major city on the Hungarian side after crossing the border from Austria. 🔥 Our range includes, among others: • Wood chip boilers • Pellet boilers • Wood gasification boilers • Log wood boilers • Biomass boilers • Oil and gas boilers • Heat pumps • Thermoventilators • Hot air blowers • Warm air heaters • Industrial heating systems • Buffer tanks • Heat exchangers • Feed screws • Auger extraction systems • Burners • Pumps • Comprehensive heating accessories ⚙️ Accessories and Components: We also stock a wide selection of accessories such as circulation pumps, plate heat exchangers, and many other components – suitable for private and industrial applications. 🏭 Brands in our range: Fröling, Hargassner, KWB, HDG, Binder, ETA, Herz, Guntamatic, Windhager, Viessmann, Buderus and many more. 🌐 Current Offers: Most of our current inventory can be found on our website: topheatingsystems.com Further products are available that have not yet been listed online. 📅 Viewing: On-site inspections at our warehouse are possible by prior appointment. If interested, please contact us – we are happy to help you find the right solution.

Koşul: ikinci el, For sale: MAWERA 470 kW Biomass Boiler – Robust Industrial Wood Chip Heating System The MAWERA biomass boiler with a nominal heat output of 470 kW is ideal for industrial and agricultural heating systems with a consistently high heat demand. Austrian quality, durable construction, and efficient heat transfer are the hallmarks of this boiler. ⸻ Technical Specifications: • Fuel: Wood chips, sawdust, planer shavings • Nominal heat output: 470 kW • Combustion system:   ◦ Feed auger for fuel supply   ◦ Combustion chamber with heat-resistant fireclay lining • Control & air supply:   ◦ Primary and secondary air managed by motorized air dampers and blowers   ◦ Temperature-controlled regulation with flue gas and combustion chamber sensors • Boiler construction:   ◦ Water-bearing boiler with large heat exchanger surface   ◦ Combustion chamber doors front and rear for easy access and maintenance ⸻ Location: Hungary, 9200 Mosonmagyaróvár, Kötöttárugyári út 22 (ProfiKazán) TOP HEATING SYSTEMS – Used heating systems, boilers, heat pumps & accessories directly from stock We are a family-run business with around 20 years of experience in heating technology and a 1,500 m² warehouse in Mosonmagyaróvár, Hungary, with a continually available stock of approximately 50–60 units. 📍 Location: Our warehouse is in Mosonmagyaróvár, Hungary – about 15 km from the Austrian border and around 80 km from Vienna. Mosonmagyaróvár is the first larger city on the Hungarian side after crossing the Austrian border. 🔥 Our product range includes: • Wood chip boilers • Pellet boilers • Wood gasification boilers • Log wood boilers • Biomass boilers • Oil and gas boilers • Heat pumps • Thermal fans • Hot air blowers • Warm air heaters • Industrial heaters • Buffer tanks • Heat exchangers Bodpsmuzq Esfx Almolg • Feed augers • Discharge systems • Burners • Pumps • Comprehensive heating accessories ⚙️ Accessories and components: Additionally, we offer a wide selection of accessories, including circulation pumps, plate heat exchangers, and many other components – from domestic applications to industrial-scale systems. 🏭 Brands in our range: Fröling, Hargassner, KWB, HDG, Binder, ETA, Herz, Guntamatic, Windhager, Viessmann, Buderus, and many more. 🌐 Current offers: You can find a large part of our current offer on our website: topheatingsystems.com We also have other units that are not yet listed. 📅 Viewing: An inspection at our warehouse is possible by prior appointment. If interested, please contact us – we will help you find the right solution.

Koşul: ikinci el, For sale: KWB Multifire 20–80 kW Biomass Boiler – Flexible Heating with Wood Chips and Pellets  The KWB Multifire 20–80 kW is a fully automatic biomass boiler, making it ideal for multi-family homes, commercial facilities, or agricultural operations. It can be operated with either wood chips or pellets, offering maximum fuel flexibility, reliable performance, and high efficiency. — Key features: • Fuel: Wood chips / Pellets • Output: 20–80 kW • Fully automatic combustion, feeding, and cleaning • Robust design for continuous operation • KWB – Austrian innovation in biomass heating Location: Hungary, 9200 Mosonmagyaróvár, Kötöttárugyári út 22 (ProfiKazán) — Top Heating Systems – ProfiKazán Flexible biomass heating systems for residential and commercial buildings. TOP HEATING SYSTEMS – Used heating systems, boilers, heat pumps & accessories directly from stock We are a family business with around 20 years of experience in heating technology and operate a 1,500 m² warehouse in Mosonmagyaróvár, Hungary, with a continuously available inventory of approximately 50–60 units. 📍 Location: Our warehouse is located in Mosonmagyaróvár, Hungary – approx. 15 km from the Austrian border and approx. 80 km from Vienna. Mosonmagyaróvár is the first major city on the Hungarian side after the Austrian border. 🔥 Our range includes, among others: • Wood chip boilers • Pellet boilers • Log gasification boilers • Log wood boilers • Biomass boilers • Oil and gas boilers • Heat pumps • Thermal fans • Hot air blowers • Warm air heaters • Industrial heaters • Buffer tanks • Heat exchangers • Feed augers • Discharge systems • Burners • Pumps • Comprehensive heating accessories ⚙️ Accessories and components: We also have a large selection of accessories, including circulation pumps, plate heat exchangers, and many other components – from residential to industrial scale. 🏭 Brands in our range: Fröling, Hargassner, KWB, HDG, Binder, ETA, Herz, Guntamatic, Windhager, Viessmann, Buderus, and many more. Bljdpfottqd Nex Almsg 🌐 Current offers: Most of our current offers can be found on our website: topheatingsystems.com In addition, we have further equipment not yet listed online. 📅 Inspection: A viewing at our warehouse is possible by prior appointment. If you are interested, feel free to contact us – we will help you find the right solution.

Koşul: ikinci el, makine/araç numarası: 008111, Uygulanan kenar tipi: ince kenar, kalın kenar, masif ahşap Yapıştırıcı sistemi: EVA, PUR Blodpfx Aljy Dq Iajmeg Birleştirme frezesi: evet Çok fonksiyonlu ünite: evet Maks. ilerleme hızı: 25 m/dak Maksimum plaka kalınlığı: 60 mm Çalışma üniteleri: 9 adet

Koşul: yeni gibi (kullanılmış), Fonksiyonellik: tamamen fonksiyonel, toplam ağırlık: 169 kg, Şirket tasfiyesi nedeniyle çeşitli makine satışlarımız bulunmaktadır. Diğer ilanlarıma da göz atmayı unutmayın! . Satılık: Duplo DC-516 baskı sonlandırıcı, konveyör bantlı, tamamen çalışır durumda. Bsdpfsy Ahh Usx Almelg

Koşul: yeni, Üretim yılı: 2024, Güçlü motorlu klasik emiş sistemi, büyük metal atık kutuları ve koruma için kutunun içinde kapalı olan büyük filtreleme alanı için çoklu filtreler. Ayrıca tüm sistemin zarar görmesini önlemek için büyük partikül ayırıcı içerir. Blodpfxjf D S T Ie Almog TEKNİK ÖZELLİKLER: - Motor gücü: 7,5 kW + elektronik kontrol (inverter) - Hava akışı: 6500 m3/h - Hava hızı: 32m/s - filtre alanı: 21 m2 - çöp kutusu hacmi: 450 litre - Ağırlık: 450 kg - giriş çapı: 300 mm - Boyutlar: 2400 mm X 1160 mm X 2310 mm

Koşul: mükemmel (kullanılmış), Üretim yılı: 2021, We offer the ETL Prüftechnik ATS 400 X8 automatic test system, designed for electrical and safety testing of products in both industrial and laboratory environments. The device is used for: • Quality control (QC) • End-of-line production testing • OEM laboratories and test stations — Basic Data • Model: ATS 400 X8 • Power Supply: 230 V / 50–60 Hz / max. 10 A • Year of Manufacture: 03/2021 • Manufacturer: ETL Prüftechnik GmbH (Germany) • Condition: Very good, well-maintained equipment • Last ETL factory calibration: 05/2023 • Weight: 38 kg — Equipment / Included in the Set • Main ATS 400 X8 unit with built-in touchscreen display • Windows 10 Pro operating system (OEM) • Complete set of test leads and accessories (as shown in the photos) • Manufacturer's documentation • Original markings, nameplates, CE certification — Technical Notes • This is a professional test and measurement instrument, not consumer electronics • Equipment ready for operation in a production environment Blodpjyc H N Nsfx Almsg • No signs of tampering; all connectors and interfaces complete

Koşul: mükemmel (kullanılmış), We offer a professional 3D optical measuring system, KEYENCE VL series, designed for fast and precise scanning of technical components. Blodpfx Aljyc H Npsmog The set is ideal for quality control, reverse engineering, and non-contact measurements in industrial applications. The set includes: – Scanning head VL-370 Condition: very good, well-maintained equipment Note: The set is sold without a monitor / PC unit (possibility to equip separately) Manufactured: Made in Japan

Koşul: mükemmel (kullanılmış), Satılık profesyonel, dijital Mitutoyo yükseklik ölçer (model 192-613) – Japon hassasiyeti ve güvenilirliği tek cihazda. Atölyeler, kalite kontrol ve hassas ölçümler için ideal. Teknik Özellikler: • Ölçüm aralığı: 0–300 mm • LCD ekran – düşük ışıkta bile okunabilir değerler Bedpow N Hn Sjfx Almjlg • Fonksiyonlar: ZERO/ABS, PRESET, HOLD • Güç kaynağı: CR2032 pil • Sağlam taban, güvenli destek ve hassas ölçüm sağlar • Orijinal – Japonya üretimi Durum: Cihaz tam çalışır durumda, bakımlı,

Koşul: ikinci el, Üretim yılı: 2006, I am selling a used industrial high-pressure cleaner from the Finnish company Aqua Clean, in very good condition. The unit features a working area with a diameter of 140 cm and a height of 90 cm. It is made of stainless steel and equipped with an oil separator and filter. The cleaner is insulated. The upper and side lances are driven by a motor with a reduction gear, while the lower lance is powered by a pump operating at 4 bar pressure. Additionally, the device is fitted with an exhaust fume extraction system. The heating temperature can reach up to 90°C, and it is equipped with an operating timer. The last photo shows the unit in new condition, and this model is still in production today. The operating manual is available in English. The main pump is fitted with a silicon carbide seal to withstand high temperatures and aggressive chemicals. Bsdpfx Aley Hxz Hemslg

Koşul: yeni, Üretim yılı: 2026, Fonksiyonellik: tamamen fonksiyonel, giriş akımı türü: trifaze, filtre alanı: 200 m², hacim debisi: 25.000 m³/saat, basınç: 6 bar, toplam genişlik: 3.600 mm, toplam uzunluk: 2.450 mm, toplam yükseklik: 7.000 mm, toplam ağırlık: 4.000 kg, garanti süresi: 12 aylar, gürültü seviyesi: 78 dB, Donanım: dokümantasyon / kılavuz, TOZLU HAVA FİLTRESİ - ATEX Bölge 22 Proje hava debisi: 25.000 m³/saat Yapı: Galvanizli sacdan pres bükümlü ve cıvatalı, kalınlık 2-3-4 mm Toplam filtreleme yüzeyi: 200 m² Filtre malzemesi: 500 g antistatik polyester Patlamaya dayanıklı havalandırma panelleri, yatay konumda Bedpfx Aljy Iuxdsmjlg Çıkış: 1,1 kW motorlu helezon konveyör, 0,75 kW döner valf Üst korkuluk Güvenlik merdiveni Makine kontrol elektrik panosu

Koşul: ikinci el, Üretim yılı: 1980, Basınç 6,3 t Strok 250 mm Çıkıntı 150 mm Kurulum yüksekliği 450 mm Masa yüzeyi 330 x 270 mm Masa yüksekliği yerden 970 mm Ram yüzeyi 240 x 100 mm Yağ kapasitesi 30 l Tahrik gücü 1,5 kW Bodpfx Aey Ig Nbolmjlg Alan ihtiyacı (GxDxY) 0,9 x 1,3 x 2,4 m Alman iş kazalarını önleme yönetmeliklerine (UVV) uygun olarak el ile besleme işlemlerine onaylıdır Yağ hidrolik tahrikli, ışık perdesi (Pilz marka), basınca/zamana ve stroka bağlı olarak kontrol edilebilir, üst ve alt strok limitleri, mekanik derinlik durdurucu, iki elle çalışma.

Koşul: iyi (kullanılmış), Kaldırma Sistemi, Megamat, 170kg / Seviye, yaklaşık 6m yüksekliğinde – kullanılmış - : Yerinden fiyat: 14.500.- € (net), söküm vb. hariç Üretici: Megamat Model: Megalift 14448/25/6010 Üretim yılı: 2000 Maksimum taşıma kapasitesi/seviye: 170kg Maksimum toplam taşıma kapasitesi: 18.000kg Seviye başına boyutlar: yaklaşık 2,45m x 0,80m Seviye adedi: yaklaşık 40 adet Cihaz ölçüleri: Yükseklik: yaklaşık 6,01m Genişlik: 2,76m Derinlik: yaklaşık 2,70m 3/N/PE 230/400V 10A, sigorta 16A Durum: iyi Mevcut: hemen Bljdpfxeyhxkmo Almsg Yer: BG-8800 Sliven

Koşul: ikinci el, Üretim yılı: 2013, makine/araç numarası: 2690/07, Mahr Perthometer PGK 120 Measuring range: 100 mm (X-axis) Bledpfjy D Eadjx Almsg Max. load capacity: 10 kg with cross table Probing system: MFW-250 (Measuring range in Z: ±0.25 mm) Measuring principle: tactile-inductive Contact force: 1-3 mN Probe type: Roughness probe (tip radius 2-5 µm, opening angle 60° and 90°)

Koşul: mükemmel (kullanılmış), Üretim yılı: 2015, Toz ve talaş ayırıcı, ahşap kökenli her türlü toz ve talaşın yakalanması, taşınması ve ayrıştırılması ile bu parçacıkların kaynaklarının çekilmesi ve oluşan talaş ile tozun ayrılması için kullanılır. 1 x Vakumlu modüler filtre 9/4-30, 3 elemanlı. Fanlar: 2 x US-FHN 15kW Blodey Edxujpfx Almog Taşıma cihazı: 1 x NZRS 2140x665 hücre tekerli hava geçidi Toplam hacimsel akış: 30.000 m3/h

Koşul: ikinci el, Üretim yılı: 1990, Zoller H520/019 – takım ölçüm makinesi – hassas kesici takım kontrolü için optik projeksiyon cihazı. Yaklaşık 760 mm döner tabla, dijital göstergeli, sağlam endüstriyel yapı. Blodpfx Aljy Hl I Tomjg Kullanılmış, tamamen çalışır durumda, hemen kullanıma hazır.

Koşul: iyi (kullanılmış), Üretim yılı: 1992, Single-piece woodworking sanding machine Top & bottom sanding Electric height adjustment with digital display Continuously adjustable feed speed Star-delta start Pneumatic belt tensioning Main switch Sanding belt oscillation Finishing brush unit top and bottom, manual height adjustment Working width: 190 mm Working height: 4 - 150 mm Min. workpiece length: approx. 280 mm Sanding belt dimensions (L x W): 1850 x 200 mm Feed speed: 5 - 25 m/min Installed power: approx. 14 kW Extraction connection diameter: 2 x 180 mm Dimensions (L x W x H): 2000 x 1000 x 2050 mm Weight: approx. 1800 kg Incl. infeed & outfeed roller conveyor L = 1600 mm, non-driven Used machinery notice: • Subject to errors in technical details and prior sale. • Prices quoted are ex works – free loading! • The machine has been cleaned and function-tested. • All machines are sold as inspected without any warranty or guarantee. Buyers are welcome to inspect the machines at our premises. • Special agreements must be in writing. (Enquiries will only be answered if you provide your address & telephone number!) Blsdpfewyda Uox Almog

Koşul: ikinci el, Üretim yılı: 2017, makine/araç numarası: LC611, Used Tetra Pak UHT System 5000 LPH Technical Specifications & Performance Data This Tetra Pak UHT system Steritherm (model VTIS C-4) is a robust, pre-owned processing unit designed to provide consistent ultra-high-temperature (UHT) treatment for beverage production and industrial packaging operations. Built for high reliability and easy integration with downstream filling and packaging lines, it delivers stable thermal performance and hygienic operation for modern beverage production environments. Manufacturer: Tetra Pak Model: VTIS C-4 Steritherm Year of Manufacture: 2017 Capacity: 5000 L/h Maximum Process Temperature (indicative): up to 148°C (as per inspected pressure section) Included components: - Alfa Laval SHL-20 homogenizer (250 bar) - Alfa Laval H7-RC plate heat exchanger (198 L) - Pump station with Alfa Laval LKH-10 and LKH-107 - ABB drive and CIP controller Design Concept: Continuous UHT process with integrated homogenization and plate heat exchanger Construction: Hygienic stainless-steel process components Advanced Automation & Control Systems The system includes computerized control for precise process management, providing stable time-temperature profiles and consistent product quality. Automated monitoring of key parameters helps reduce product losses and optimize energy consumption. Safety interlocks and measuring instruments ensure safe operation during heating, holding, and cooling stages. - Central computer control for process sequences and alarms Bodpsy Ef T Tjfx Almjlg - Integrated CIP controller for optimized cleaning procedures - Process instrumentation for pressure, temperature, and flow control - CE marking on the component level for included Alfa Laval equipment Integration Capabilities in Production Lines Designed to seamlessly fit into a used filling line or new production layouts, this UHT system integrates smoothly with upstream raw material handling and downstream filling and packaging equipment. It supports industrial packaging operations for PET and glass bottling plants by delivering thermally treated product directly to fillers. - Inline compatibility with fillers, buffer tanks, and conveyors - Ideal for beverage manufacturing environments requiring a continuous throughput of 5000 L/h - Flexible process connections for integration into existing pipework and CIP loops - Suitable for upgrades of used equipment or for capacity expansion Condition & Maintenance Record This unit is presented as an operational, used UHT system. Auxiliary components show evidence of professional maintenance, including a current service tag on the Alfa Laval pump (dated 04/24) and inspection protocols for pressure-bearing components. Operating condition: fully functional Inspection markings present on pressure sections

Koşul: ikinci el, Üretim yılı: 2021, 20°C su ve 32°C ortam sıcaklığında 6000 W Boyutlar (U/G/Y) 55 x 55 x 140 cm Bedpfx Alsvvi E Asmolg Depolama yeri: Tedarikçi