Plastic materials - Import export

Dressler Group (DG) has four brand values: flexibility, quality, innovation – and service. The last point is so important, a Dressler subsidiary bears its name: Dressler Group Customer Service. After all, the family business is renowned for its absolute customer focus. The best way to get to know Dressler Group is in person: Your contacts: Jan Dressler, CEO, COO: jan.dressler@dressler-group.com Christian Manteuffel, Team Manager Sales: manteuffel@dressler-group.com Alexander Leis, Staff Member Sales: leis@dressler-group.com

At our Technical Centre, which has proven its worth over many years, even the smallest quantities bring you great benefits. With an area of over 1,000 square metres, we offer the perfect facilities to verify how the raw materials will actually behave in the intended processes and finishing steps. In addition, we run scalable test series to generate reliable data for calculating costs. The process in three steps: 1. Pilot trial: testing on the smallest scale 2. Scale up trial: testing on the high-performance universal mill, with close support from our experts 3. Large-scale production: testing on the large plant for production on an industrial scale

DG Mixing process which under the application of high speeds injects enough energy into a powder quantity to create a stable compound from different types of powders and grain particles. Used, for example, for coating surfaces of one type of particle with other particles.

Fine grinding of dry products is a core competence of the Dressler Group. An extensive range of machine and system programs are available for this, offering the right solution for almost all applications. Finenesses from 1 μm (d97) and into the millimetre range can be reproduced here.

Method for determining the grain size; air jet sieve, vibrating sieve, but also used in a production system for separating the coarse component of a powder so as to obtain the desired grain size distribution. Using acceleration to separate particles of different weights and therefore mostly different sizes.

Recording of data and events in written form for later reference. Full documentation is important for all stages of an order. All relevant data is documented and archived, from order entry, production, quality assurance to dispatch. This ensures that the individual processes can be traced back.

We developed a special process for making fine powder systems and composites from low-viscosity melts. With the patented cryo-spraying process CSP, it has become possible to produce highly sensitive products directly from a hot melt to form a solid powder without after-cooling. The entire spraying process is overlaid with nitrogen and also protects very critical substances against oxidation and thermal stress.

DG Grinding processes with simultaneous cooling of the raw material to temperatures far below ambient temperature (e.g. minus 30°C); usually done with the help of liquid nitrogen, which has a temperature of around minus 196°C.

Plastics processing through the homogeneous mixing of additives, particularly in extruders at temperatures above the melting point.

We grind our customers products at temperatures below room temperature.

Process of grinding and ultra fine grinding during which compressed air is blown into the grinder under high pressure through nozzles, thereby swirling and crushing the particles. Examples of our services: 1. PA12: d50 = ca. 5 µm; 2. PEEK: d50 = ca. 8 µm; 3. PPS: d50 = ca. 12 µm; 4. PA11: d50 = ca. 8 µm Let us know what you would like us to do for you!

Two current examples of Dressler Group innovations: Spherical Powder Technology (SPT) and the development of integrated processes. SPT is a process that allows powders to be made out of high-performance polymers that cannot otherwise be pulverised. This opens up completely new kinds of applications, using processes such as 3D printing/additive manufacturing, that were equally impossible before. Meanwhile, integrated processes allow grinding, sieving and dust removal to be carried out in a single operation rather than separate steps, thus saving energy and time.

At our Innovation Lab, we develop entirely new processes when the desired results cannot be achieved with standard solutions. Our customers can practically watch over our shoulder and participate in the process to the extent they choose. The results are then put to the test in the adjacent Technical Centre. Sometimes this opens up whole new business areas for our customers. Getting more than they bargained for – that’s one more thing our customers appreciate.

PROCESS DATA MEASUREMENT AND PROCESS CONTROL ON HIGHEST LEVEL AND MAINTENANCE-FREEFollowing the user‘s request for easy maintenance and low susceptibility to slightly soiled water, the proflow ultrasonic - as a replacement for the current and widely used standard measuring variant with impeller, turbine or vortex - now makes contactless measurement according to the ultrasonic principle (without rotating parts) available. The sensors can be visualized via a protemp controller or connected to a PLC. Alternatively, the mechanical flow measurement according to the differential pressure principle is available with the proflow mechanical. Easy to integrate in machines and plant lines 4 or 6 x consumer channels (forward/return) 1/2“ With LED-display on fl ow sensor Temperature measurement PT 1.000 Big RED/GREEN Status LED 1 x main connection 1“ Flow rate each channel 1 ... 30 l/min (no „overload-risk“-> 60 l/min possible]) Operating temperature: 0 ...120 °C

Our gwk engineers are passionate about developing technical solutions and this is what we as manufacturers want to prove in the area of cooling towers with our gvk/ghkv series. We see it as our task to understand the entire process of our customers. Therefore we have focused on quality and longevity for the products gvk/ghkv. The cooling towers are part of a central cooling tower system, supplied turn-key and regulated with a freely programmable microprocessor control system or programmable logic control. They are used for dissipation of excess heat from production systems with a higher temperature level and they operate on the principle of evaporation. This is an important consideration for environmentally conscious industries.

Every industrial production requires energy in order to make products. Often, electrical or primary energy is induced as heat, used for operation and must then be dissipated, converted or destroyed. Our gwk process engineers analyse and calculate production processes and the overall thermal periphery with the objective of lowering the necessary energy by means of energy recycling, of reducing the energy requirement at the individual stations, of converting energy or using it several times and dissipating it sensibly. The result is considerable energy saving, which results in cost-cutting and contributes to preserving the environment.

PROCESS DATA MEASUREMENT AND PROCESS CONTROL ON HIGHEST LEVEL AND NEARLY MAINTENANCE-FREEFollowing the user‘s request for easy maintenance and low susceptibility to slightly soiled water, the proflow mechanical - as a replacement for the current and widely used standard measuring variant with impeller or turbine - now makes mechanical measurement according to the differential pressure principle (without rotating parts) available. The sensors can be visualized via a protemp controller or connected to a PLC. A completely non-contact flow measurement based on the ultrasonic principle is available with the proflow ultrasonic. Robust flow measurement in consumer return line PT 1.000 temperature measurement in consumer return line 6 x 2 consumer channels 3/4“ female screw thread 1 x 2 main connection 1“ female screw thread Available in three temperature variants: operating temperature up to 100°C, up to 160°C and up to 180°C Max. flow rate each channel:: 25 l/min or 50 l/min

AIR- AND WATER COOLED COLD WATER UNITS gwk chillers in the sklc series are air-cooled compact cold water units with integrated condenser gwk chillers in the skw series are water-cooled compact cold water units cooled with external cooling water These chillers are equipped with screw condensers; the power regulation of the capacity to be dissipated is continuous. Water-cooled cold water units in the skw series with low coolant content can be operated very efficiently and are preferably used when the available cooling water from gwk cooling towers, gwk free cooler systems or customer-provided supplies has a higher temperature level than required for the production process but is available inexpensively..

Whenever the process requires high temperatures and the advantages of water as heat carrier (best heat conductivity properties, inexpensive, low viscosity) are to be used, this construction series is the best solution. Absolute reliability, high regulating accuracy, easy operation and a favorable price /performance ratio: apart from the versatile performance features a modern temperature controller has to fulfill, these are the key criteria for the temperature controllers teco wh/whx. As one-circuit and multi-circuit units, our modular temperature controllers in the teco whx series cover a wide performance spectrum. Heating capacities of 12 to 600 kW, max. possible cooling capacities up to 1460 kW* and pump flow rates of max. 200 m3/h are impressive basic data of these technically sophisticated temperature controllers for operation with compressed water up to 220 °C.

HIGH PERFORMANCE TEMPERATURE CONTROL DEVICE WITH HIGH COOLING CAPACITY, HIGH FLOW RATE AND REDUCED ENERGY CONSUMPTION. Due to the design, dimensioning and selection of the used components, enersave temperature control systems are the most efficient systems on the market with the highest flow rates at operating point. In the selection series we used the most frequently selected equipment features and heating performance of the proven premium series advanced. The protemp selection temperature control unit is particularly suitable for the supply of multi-circuit water distributors and is designed for the display of up to 6 external proflow temperature control channels.

Lime and corrosion are hidden cost factors. Inevitably, these two “enemies of temperature control channels” prolong the cooling time, reduce the process safety and have a negative influence on the parts’ quality. The problem occurs insidiously in each plastic processing company, because lime and corrosion gradually build an insulation layer in the cooling channels and are thus responsible for a deteriorating heat transfer. Often the problem is not recognized until the demanded parts’ quality cannot be achieved any longer or if the complete system breaks down. The effect of cleaning the cooling channels of an injection mould is a reduction of cooling time up to 40 % (in individual cases even more), depending on the amount of deposits. The latest development, easy to use by the processor himself, is moldclean, a compact appliance which cleans polluted cooling channels in injection moulds and heat exchanger systems.

With the decentralised solution, gwk adds a machine series that offers a high level of flexibility for numerous applications to its portfolio. The customer can individually and precisely set the ideal cooling water temperature for every production machine and for every process in production. Thanks to the direct connection to the consumer, there are no thermal losses, but instead a high flow rate and constant pressure. The weco wd series consists of easy to operate plug&play machines that can easily be installed and commissioned. Three processes can be run with the solution: Free cooling, refrigeration process for low temperatures down to -5°C and temperature control up to 90 °C –everything can be chosen as desired. There is a total of four models with cooling powers between 14 kW and 36 kW (at 15 °C feed flow temperature) and heating powers between 9 kW and 36 kW.

The integrat 80 is used for the modular temperature control with water up to 140°C in the basic version with up to six temperature control circuits to be operated completely independently of each other. The basic version can be expanded with extension columns and up to 24 temperature control modules. As an option, the temperature control circuits can be extended with the 4-way distributor vtc with flow and temperature measurement. Thus, a maximum of 96 temperature control circuits can be monitored with the vtc 4-way distribution system. In conjunction with the standard heating control system used as standard, a homogeneous temperature profile on the mould cavity surface is achieved in an extremely energy-efficient manner, as well as with constant cooling by using a motor valve. As an option, the pumps can also be operated with frequency control unit. This improves the procedural results and contributes to energy savings.

Dynamic mould temperature control is a temperature control method that allows temperature variations within the cycle and is also known as “variotherm temperature control”. While this method has been known for almost forty years, it has only undergone a dynamic development in the last few years. This is due to the increasingly exacting quality requirements of consumers (e.g. prevention of visible joint-lines, gloss variations and other surface defects) and the use of plastic materials in new applications. When a temperature control system is selected it is important to mind that it matches exactly with the application and that the economic benefit justifies the technical efforts as well as the energy consumption.

MULTI-ZONE TEMPERATURE CONTROL- AND MONITORING SYSTEM WITH NON-CONTACT FLOW MEASUREMENT. Due to the design, dimensioning and selection of the used components, enersave temperature control systems are the most efficient systems on the market with the highest flow rates at operating point. By using the frequency inverter, the already high basic efficiency is optimized and the pump characteristic curve will be optimally adapted to the respective operating conditions. The flow measurement of the individual temperature zones is carried out using noncontact measurement technology according to the ultrasonic principle.

The patented gwk solution includes cold water temperature controllers that can be operated without glycol in the temperature range between 0 °C and 25 °C. The user can select between two models that are differing in cooling capacity and flow rate. A precise microprocessor control with simultaneous indication of nominal and actual value, the simple one-touch operation, optional interfaces at the front panel and external sensor connection, splash-water proofed electrics and the cabling with CEE-socket ready for connection make the unit ready for immediate use. Leak stop operation, mould draining, acoustic alarm, automatic filling and top up, additional manual filling possibility for conditioned water, strainer in the cooling water connection and parts out of corrosion resistant materials that are in contact with the medium are part of the comprehensive standard equipment.

The higher process temperatures, the higher the technical requirements for the temperature machine. Decades of experience in construction of temperature machines for heat carrier oil applications up to 400°C makes us the preferred partner of many customers for applications of this kind, particularly in the area of pressing and extrusion. Dimensioning of our teco tt/th series up to 400°C is based on DIN 4754. Design and technical configuration of all temperature controllers are based on the requirements of this norm. Exact film temperature calculation ensures, in combination with flow monitoring, efficient and at the same time reliable operation in all operating conditions. A lockable filter in the circulating medium return line is a standard installation; another installed feature is an expansion vessel with a cold oil container for reliable prevention of damage by oxidation due to oxygen accumulation in the heat carrier.

Brand-new perspectives and possibilities are offered by the dynamic temperature control with CO2. This new and environmentfriendly procedure really provides a solution for heating and cooling of complex and thinwalled moulded parts. By using gaseous media for heating and cooling processes, soiled cooling channels are now a thing of the past. Basically it is true that gaseous media have the disadvantage to be bad heat carriers. This applies at least to air that is only used for cooling processes under special circumstances. But in contrast, if the opportunities of CO2 are exhausted properly, it offers an interesting alternative to conventional water temperature control.

HIGH PERFORMANCE TEMPERATURE CONTROL DEVICE WITH HIGH COOLING CAPACITY, HIGH FLOW RATE AND REDUCED ENERGY CONSUMTION. Due to the design, dimensioning and selection of the used components, enersave temperature control systems are the most efficient systems on the market with the highest flow rates at operating point. By using an optional frequency inverter, the already high basic effi ciency can be more optimized and the pump characteristic curve can be optimally adapted to the respective operating conditions. PROTEMP SERIES 1-4 ADVANCED Water temperature control unit up to 95°C -140 °C Cooling capacity: 105 - 717 kW Heating capacity 9 - 50 kW Digitization concept „protemp connect 4.0“ Dual frequency version (50/ 60 Hz), motor IE3 class Energy consumption display Pump speed control OPC UA interface