Hose extrusion with dry vacuum technology
The production of undersea cables is the core competence of Norddeutsche Seekabelwerke, which belongs to General Cable. The insulation layer and gelcoat around the cable strands are made of polyethylene (PE). These PE coatings are applied directly to the cable strands by hose extrusion. Dry Mink claw vacuum technology is deployed in this process and only demand-controlled Mink MV claw vacuum pumps are used that reliably maintain the desired vacuum level during the entire production process and thus make a significant contribution to the high product quality.
The Norddeutsche Seekabelwerke (NSW) sites are located directly on the Weser River in Nordenham (Germany)
Norddeutsche Seekabelwerke (NSW) was founded as early as 1899. The first undersea cable with a length of 7,993 kilometres was laid in 1904. NSW has been completely owned by General Cable Corporation since 2007 and is the competence centre for undersea cables within this international group of companies at its original site in Nordenham/Weser. With its own pier and cable-laying ships, the undersea cables can be "wound" from the factory directly onto the ships, driven to the area of operation and laid there. Nowadays, NSW produces undersea cables with a length of up to 10,000 kilometres.
NSW's main product is medium and high voltage cables that are laid under water. The range extends from transatlantic cables to the cabling of offshore wind farms, connections from islands to the mainland and cables laid across lakes or rivers. Cables for telecommunications or optical cables as well as copper cables for motor windings are also part of the product range.
NSW currently uses three single-screw extruders for hose extrusion, which operate with a screw diameter of 45 to 150 millimetres. This is mainly used to manufacture intermediate products, i.e. individual cables that are later processed together with other cables to form an undersea cable. Depending on the product, three different PE coatings are applied simultaneously around a copper strand using a mould. The first layer is a thin PE coating that smoothes the surface of the copper strand. The actual insulation layer is made of a different PE plastic. As mechanical protection a further PE plastic layer is extruded onto the copper conductor as a third coating. During this process, vacuum is permanently applied directly in the mould in the cavity between the strand and the coating. It ensures that the three layers cling directly to the strand or directly to each other and that no air inclusions occur.
In the past, NSW used liquid ring vacuum pumps on the extruders, which proved to be extremely maintenance-intensive and unreliable. These vacuum pumps each had a 7.5 kW motor as drive and could not be adjusted. It was only possible to set the vacuum level manually via a false air valve. The water used to operate the vacuum pumps caused problems. A tank was installed in the water circuit in order to keep the amount of water as high as possible. As the melts are extruded at temperatures of 200 to 210 degrees Celsius, the water still heated up to almost 100 degrees Celsius in some cases. A larger tank was installed and thus the amount of water was further increased; however, this did not really help to solve the problem. The vacuum level attainable using liquid ring vacuum pumps is directly dependent on the water temperature. The lowest ultimate pressure is achieved at temperatures of approximately 15 degrees Celsius. Higher temperatures have a negative impact on the ultimate pressure. A further complication was that the water often had to be changed because monomers and particles accumulated in it. They had an aggressive effect on both the vacuum pumps and the material in the entire water circuit, meaning that parts had to be repeatedly replaced. Vacuum pump failures also caused downtime in the extrusion process.
Two Mink MV 0080 C claw vacuum pumps are now installed on each of the three extruders. NSW opted for this vacuum technology because it had already been used for many years in pneumatic material feeding to the extruders with positive results. Mink claw vacuum pumps are used in this process to generate the vacuum for suction conveying of the granulate. This has shown how reliable and economical Mink vacuum pumps are. The Mink MV sizes now used for hose extrusion operate completely redundantly and are controlled in such a way that they are operated alternately. Due to the length of the cables produced, an extrusion process can take up to one week. This means that during this time the vacuum is permanently maintained and the preset ultimate pressure is precisely maintained. Leaks during the feeding of the strands into the extrusion mould can cause higher or lower amounts of air leakage. The frequency-controlled drives of the Mink MV vacuum pumps ensure that the set point is maintained by changing the speed. Manual control is no longer necessary. Each individual vacuum pump is preceded by a separator that makes sure no entrained plastic particles can enter the vacuum pumps. The drive power of the Mink MV vacuum pumps is 2.1 kilowatts each, which is considerably lower than that of the liquid ring vacuum pumps with 7.5 kilowatts each previously used.
The decision to install the new Mink MV vacuum pumps in May 2017 has proven to be the right one. The six Mink MV claw vacuum pumps operate completely trouble-free and efficiently. Maintenance is limited to emptying or cleaning the upstream separators and to an annual gear oil change on the vacuum pumps.
Busch Vacuum Pumps and Systems is one of the world’s largest producers of vacuum pumps, vacuum systems, blowers and compressors.
Its extensive product portfolio comprises solutions for vacuum and overpressure applications in all industries, including the chemical, semiconductor, medical technology, plastics, and food sectors. It also covers the design and construction of customized vacuum systems, as well as a global service network.
The Busch group is a family-owned company and is still managed by the Busch family. Busch Vacuum Pumps and Systems has 3,000 employees in more than 60 companies in over 40 countries worldwide. Busch is headquartered in Maulburg, in southwest Germany. This is the location of Busch SE headquarters, as well as the German production facility and German sales company. In addition to Maulburg, Busch also has its own production plants in Switzerland, the UK, Czech Republic, Korea and the USA.
Busch Vacuum Pumps and Systems was founded by Dr.-Ing. Karl Busch and his wife Ayhan Busch in 1963. Dr.-Ing. Karl Busch developed the “Huckepack”, which was the first vacuum pump that could be used for vacuum packaging of foodstuffs. The follow-up product, the compact “R 5” rotary vane vacuum pump, revolutionized food packaging. A further milestone represented the development of the “COBRA” screw vacuum pump. In 1971 the international expansion of the Busch group started with the founding of a sales company in the UK. The first production plant outside Germany was established in the USA in 1979.
Busch Dienste GmbH
Global Marketing / Marketing Services
Coordinator Global Press & Media Relations
DE 79689 Maulburg
Phone: +49 7622 681 3376
This release was published on openPR.
Permanent link to this press release:
Please set a link in the press area of your homepage to this press release on openPR. openPR disclaims liability for any content contained in this release.
You can edit or delete your press release Hose extrusion with dry vacuum technology here
News-ID: 1676332 • Views: …
More Releases from Busch Dienste GmbH
Liquid ring vacuum pumps – Classic vacuum technology and yet still state of th …
Vacuum technology has never stopped developing – not only in the recent past, but for decades it has continued to progress. Today, dry screw vacuum pumps are used in chemical processing technology and many other applications just as dry claw vacuum pumps have established themselves as standard vacuum generators in entire branches of industry. Oil-lubricated rotary vane vacuum pumps are also state of the art in many applications, not least
Proven vacuum technology fit for Industry 4.0
Busch Vacuum Pumps and Systems enjoyed a great deal of interest from an audience of experts at the IFFA in Frankfurt. The vacuum technology specialist showcased its latest products for the vacuum packaging of meat and sausage products and for meat processing. Busch also premiered the new R 5 PLUS rotary vane vacuum pump, which is prepared for Industry 4.0. This innovative vacuum pump is based on proven rotary vane vacuum
Busch solutions for Industry 4.0 at ComVac
The Busch Vacuum Pumps and Systems trade show appearance received a great response from visitors to ComVac, the leading international trade show for compressed air and vacuum technology, held in Hanover, Germany. The interested trade show crowds were able to discover the topic of Vacuum 4.0 and the best-fitting innovative vacuum solutions at Busch. Numerous visitors took the opportunity to talk to the Busch vacuum experts. With Vacuum 4.0, Busch is
Dry vacuum systems for centralization of vacuum supply
The concept, design and realization of central vacuum supplies is one of Busch Vacuum Pumps and Systems' core competencies. Thousands of such vacuum systems are in operation worldwide. A wide range of operating principles for generating vacuum in the individual pump modules are applied. In addition to oil-lubricated R 5 rotary vane vacuum pumps, dry-compressing vacuum modules can be used, for example in vacuum systems with COBRA NX screw vacuum
More Releases for NSW
Best Wall Chasing Sydney Services in NSW Region
Home renovating may seem like a simple process, but wall chasing Sydney is not that simple. Although you think you can do this by yourself, the reality is that you need a team of professionals who will complete the process with ease. Usually, a construction site requires to perform chasing a wall, due to an installation of a new electric network or placing water pipes. Independent of the material, this method
Housecheck NSW offers building and pest inspection reports in NSW
Housecheck NSW a leading building and pest inspection service provider in NSW, Australia. It announced that they offer an exciting new way to purchase building and pest inspection reports into its increasing collection of property service offerings for the property purchasers. Housecheck NSW targets simplifying the tedious property buying experience by providing buyers to purchase building and pest inspection report online with a reliable and certified building inspector. Customer who wants to
Virtual Assistant Emma Wilson Provides VA Services in NSW Area in Australia
In today’s economic climate, more business people are searching for various ways to standard in-office assist. The Virtual Assistance sector has witnessed much growth in the last several years, and lots of Virtual Assistants offer specialized “niche” services to lawyers, realtors, as well as coaches; not forgetting lots of different other business people that may take advantage of the utilization of a Virtual Assistant. This industry offers a solution for
Housecheck NSW - The Melbourne Based Firm Offers Building and Pest Inspection Se …
A NSW-based company, Housecheck NSW, is now providing building and pest inspection service across NSW, AU. The service provider is providing vital home inspection services like inspection of structural defects, unwanted pests, asbestos, deadly carbon monoxide checks, and much more. The organization hopes that via its services, it can help homeowners to keep their buildings/homes within the best circumstances possible. “House inspections are essential and really should be sought as frequently
NSW Infrastructure Plan Facilitates a Growing Sydney
As part of the NSW government’s commitment towards infrastructure development as the bedrock of a growing Sydney, the government has committed over $73.3 billion into infrastructure works over four years. Infrastructure projects currently in the pipeline are expected to expand and upgrade a wide range of crucial roads, rails, supply chain infrastructure as well as schools and hospitals in Sydney and throughout the state. With economic and financial capacity directed
ClaimVantage Sponsors Australia NSW ALUCA & CMG Professional Development Confere …
ClaimVantage, an international provider of automated claims-processing technology, will sponsor the September 4th NSW ALUCA & CMG Professional Development Conference taking place at the Sydney Hilton. Portland, ME, August 30, 2013 -- ClaimVantage, an international provider of automated claims-processing technology, will sponsor the September 4th NSW ALUCA & CMG Professional Development Conference taking place at the Sydney Hilton. In recent years, ClaimVantage has introduced its cloud-based Absence, Disability, Accident and Life claims