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Extrusion Screw Diameter
Just purchased 6 Bekum 121's - Priced Right !
1983 Bekum Model H-121 - Head configuration- Single head - Currently set up to produce PVC bottles - Extruder H.P.- missing 50 H.P. motor - Includes O'Connel part take away system (missing a de tabber drive shaft, and drive sprocket) - Barber Coleman Maco VI microprocessor controls - Triple channel 49 point parison programming 1982 Bekum Model H-121 - Head configuration- Triple head with 100 m.m. center to center distances between heads - Currently set up to produce PVC bottles - Extruder H.P.- 50 H.P. motor - Includes Flex-I-Boss part take away system - Upgraded to Barber Coleman Maco 6500 microprocessor controls - Two programming options are installed and operable on this machine: - Dual channel 100 point parison programming (included in the Maco 6500 package) - Hunkar 34 point programming 1981 Bekum Model H-121 - Head configuration- Dual head with 140 m.m. center to center distances between heads - Currently set up to produce HDPE bottles - Extruder H.P.- 50 H.P. motor - Controls- Hunkar Smart Box 2000 parison programming 1981 Bekum Model H-121 - Head configuration- Triple head with 100 m.m. center to center distances between heads - Currently set up to produce PVC bottles - Extruder H.P.- 50 H.P. motor - Includes Flex-I-Boss part take away system (missing (1) up/down cylinder and (1) reach and take cylinder) - Barber Coleman Maco 8000 microprocessor controls - Dual channel 100 point parison programming (missing one card) 1977 Bekum Model H-121 - Head configuration- Dual head with 140 m.m. center to center distances between heads - Currently set up to produce PVC bottles - Extruder H.P.- 50 H.P. motor - Note- 2 valves are missing from hydraulic tank - Includes Flex-I-Boss part take away system - GE Fanuc microprocessor controls - Hunkar Smart Box 3000 parison programming 1973 Bekum Model H-121 - Head configuration- Triple head with 100 m.m. center to center distances between heads - Currently set up to produce HDPE bottles - Extruder H.P.- 50 H.P. motor - G.E. Fanuc Series 1 microprocessor controls - Hunkar 34 point parison programmer Bekum Model H-121 blow molding machines have a dual-sided shuttle clamp with maximum cavitation and bottle sizes as follows: - "2 up" production of up to a maximum 5 liter bottle when a single head is used - "4 up" production of up to a maximum 2 liter bottle when a dual parison head with 140 m.m. center to center distances between heads is used - "6 up" production with a triple parison head when 85 to 100 m.m. center to center distances between heads is used - "8 up" production with a quad parison head when 70 m.m. center to center distances between heads is used - "10 up" production with a 5 parison head when 60 m.m. center to center distances between heads is used - "12 up" production with a 6 parison head when 50 m.m. center to center distances between heads is used GENERAL INFORMATION: * Bekum continuous extrusion blow molding machines are amongst the most successful designs available, having sold more than 3500 high capacity blow molding machines throughout the world. This is convincing proof of the confidence placed by leading plastics processors in Bekum equipment. This confidence is based on the performance and reliability which characterize Bekum blow molding machines. Bekum have consistently improved their range of high capacity automatic blow molding machines, whilst maintaining the successful basic design features. This puts at your disposal blow molding systems that allow you to meet all requirements of a constantly changing market. * Up to 4 parisons can be fed from up to 5 extruders, and are available with twin clamping stations to enable you to produce profitably at very high output. * OPERATING PRINCIPLE OF BEKUM HIGH CAPACITY BLOW MOLDING MACHINES: * The plastic raw material is fed through a hopper to the extruder where it is plasticized and continuously extruded through a single or multiple diehead into one or more parisons. The parison length depends on the shape and size of the molding being produced. The parison length is controlled by adjusting the speed of the extruder screw. * Both mold closing units which hold the molds move alternately along an inclined track under the extrusion head where the mold closes around the parison. The parison is cut off between extrusion head and mold and is securely welded by the bottom of the mold. The mold then moves down to its blowing station where the blow pin (or blow pins in the case of multi-cavity molds) advances into the parison, inflating it to produce there hollow molding and accurately calibrating the neck shape. The finished moldings drop out (or optionally can be removed by one of various systems for aligned take-off). * Bekum high capacity blow molding machines consists of two main assemblies forming one complete unit: the extruder and the automatic blow molding unit with their electrical, electronic, hydraulic and pneumatic control systems. The blow molding unit forms the front part of the machine, the two mold closing systems being carried in separate welded steel frames. * Depending on the size, shape and material of the molding produced, each mold can have one, two, three, or four cavities producing from 2 to 8 finished moldings per machine cycle. The calibrating stations can also be changed over simply and quickly to suit the different mold cavity combinations. BEKUM ADVANTAGES: * High production rate by the fast operation of two mold closing systems (high shot repetition rate). * Versatile production due to optimized design of mold closing systems. * Complete flash separation and removal. This eliminates subsequent finishing operations. * Rapid resetting for different products because of easy access to all essential components. * Reliability and efficiency owing to hydraulic drive system for mold carriage movement, clamping and calibrating system and special equipment. * Increased production rate and reduced material cost by using Bekum's infinitely variable electronic parison programming system. * Positive control of all machine functions is ensured by the well laid out and clearly marked controls and instruments. * Wide range of technical features offers fully automatic production even of products with a complex geometry. * Long machine life due to rugged construction, using proven components and high-grade materials. * Minimum maintenance requirements. * Variable mold closing delay (inching) as standard equipment. * World-wide service. * Coextrusion and Bi-Extrusion possible with additional extruders and special heads. EXTRUDER: * EFFICIENT PLASTIFICATION IS ESSENTIAL FOR HIGH PRODUCT QUALITY. * Bekum extruders are capable of handling all known thermoplastic materials. All components of these extruders are easily accessible for inspection and maintenance. * The extruder barrels are electrically heated by resistance heater bands. Precision control units ensure that the correct processing temperature is maintained. * The machines are supplied with extruder lengths of 20D and 24D as standard. These are available either as PE screws up to 120mm or PVC screws up to 90mm depending on the properties of materials being processed. PVC screws include internal cooling of the screw tip area. * An efficient and closely controlled barrel cooling system ensures that even thermally sensitive materials, such as rigid PVC, can be processed. * Alternative cooling systems are available: * a) direct barrel cooling through a pressed-in coiled copper tube for oil or air cooling. * b) indirect cooling by fans coupled with the barrel heater bands - this method is preferred for PVC processing with screw diameters of up to 60mm and for PE processing with screw of 80mm and more. EXTRUSION HEADS: * Single or multiple extrusion heads are available for twin or multiple parison production. Different types of extrusion heads are available, depending on the rheologic values of the resin, which guarantee optimum parison quality. The different head sizes lead to best results. HYDRAULIC DRIVE SYSTEM: ECONOMICAL AND RELIABLE. * Mold opening and closing, carriage movements, calibration, automatic parison wall thickness control and a variety of ancillaries are controlled by hydraulic drives. Due to its high efficiency this type of drive is very economical and extremely dependable. The high wear resistance of hydraulic drive components minimizes maintenance requirements. Long service life and little need for spares are added advantages. * The clamp has a hydraulically operated toggle system which offers high clamping pressure and fast movements at low power consumption. Quick mold changes are made possible without need for resetting. As the toggle levers are never fully extended, the clamping pressure cannot increase to uncontrollable levels. * The complete hydraulic control system- incl. any options - is contained in a tank - in the extruder base. The tank offers complete safety against oil leakage. A directional control block houses all oil ducts for controlling the various machine movements. The corresponding control valves are mounted direct on the directional control block. The connections between hydraulic tank and cylinders are made by high pressure hoses. A switchable pressure guage checks the various hydraulic pressures. * A temperature controller on the heat exchanger controls the flow of water and assures a constant operating temperature of the hydraulic oil. * The accumulator of the hydraulic power pack includes a pressure relief and shutoff valve block. PNEUMATIC SYSTEM * In addition to blowing, the following operations are pneumatically controlled: Parison cutting and optional equipment, such as in-mold cutting or systems for neck and bottom flash trimming. All pneumatic control valves are neatly arranged on directional control blocks on the frame of the blow molding machine. The blowing and operating pressures can be preset on pressure control valves and are indicated on pressure guages. ELECTRICAL EQUIPMENT * The electrical equipment is housed in a separate control cabinet. All switches and indicating lamps required to operate the machine are located on a swivel-mounted control panel at the machine. The control panel contains the electrical equipment for the extruder drive, the heater controls, the programmer, and all controls for the various machine movements. The blow molding machines can be supplied either with conventional controls, i.e. with relays and contactors, or with all electronic control. AUTOMATIC PARISON PROGRAMMING HELPS TO SAVE COSTS. * By adding a parison thickness control it is possible to program the wall thickness of the extruded parison and to determine the distribution of material throughout the product. This improves the quality of the molding whilst at the same time saving material because the material is distributed exactly where it is needed to combine maximum strength with minimum weight. And a smaller volume of material, in addition to saving costs, also reduces the cooling time and consequently increases productivity. The parison thickness control operates electrically. BEKUM H-121 SPECIFICATIONS: (dual station shuttle clamp) * 2, 4, 6, 8 cavity molds * Maximum part dimensions (a Bekum 121 can produce bottles up to 5 liters. The actual part dimensions will be determined by the specific part design) 375mm maximum bottle length 200mm maximum bottle diameter * Maximum usable mold area (HxV inches) 13.4 x 18.7 * Clamp force 7.8 tons * Maximum open daylight 18.9 inches * dry cycle time: sec. 1.7 * max. number of cycles per minute: 26 * operating pressure, pneumatic: bar(psi) 8-10(100-125) * hydraulic pump motor rating: 11.2kW, 15HP Extruder * smooth barrel, type/ratio: S831S, 24:1 L/D * screw diameter: 80mm * screw speed range: HDPE 0-86 rpm, PVC 0-46 rpm * screw power requirement: 38kW, 50HP * maximum output: HDPE 127kg/hr (280lb/hr); PVC 105kg/hr (230lb/hr) Electrical, air and cooling water consumption data: * heating capacity extruder: 16.3kW * connected load of complete unit, max. possible (smooth barrel): 73.5kW * hydraulic tank cooling, max.: 15300kJ/hr (14500BTU/hr) * compressed air requirement (intake), max.: 2400NL/min (85scfm) * NOTE: Actual air, cooling water and power consumption are approximate and will vary with bottle type(s) and production set-up. Actual consumption approximately 60% of the maximums listed. 12000BTU/HR.=1ton refrigeration
----------------------------------- NOTE: Although machinery descriptions are believed to be accurate and are from sources deemed reliable, they are not guaranteed and we invite your inspection prior to purchase.
We are one of the largest stocking dealers of plastics molding machinery in the United States, and have been selling plastics machinery worldwide for over 35 years. Our inventory is constantly changing, and we are often liquidating complete plants. Please keep in contact with us so that we can keep you informed of our latest purchases.
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