Loss-in-Weight Overview Principle In loss-in-weight feeding, the entire feeder, hopper and material are continuously weighed. As the feeder discharges material, the rate of decline in system weight is computed, and feeder speed is adjusted to maintain the desired (set) rate. Advantages, Limitations and Considerations Accuracy – In practice, with today’s advanced weighing and control technologies, reliably high performance accuracy is routinely realized, notwithstanding the significant demands placed on weighing and control operations in loss-in-weight feeding.   Range – Loss-in-weight feeding systems are available for the complete range of rates encountered in plastics compounding and extrusion operations.   Material Handling - Any feeding device suitable to the process material can be employed (e.g., screw, auger, vibrating tray, etc.). Even liquids whose specific gravity varies can be gravimetrically controlled by substituting the hopper/feeder with a holding tank and pump or control valve. (Related info)   Material Containment - Loss-in-weight feeders readily lend themselves to complete material containment where dusting or safety/toxicity concerns apply.   Tare – Under the loss-in-weight principle, moment-to-moment differences in weight matter, not absolute weight. Thus, for the purpose of feed rate control, tare becomes irrelevant.   Weighing – Considering the fact that loss-in-weight feeding involves the accurate detection of small, moment-to-moment changes in system weight while simultaneously weighing a relatively massive feeding system, the demands on the weighing system are substantial. Such measurement requires the highest possible levels of resolution, linearity and stability along with sophisticated filtering and signal processing to extract meaningful weight data from spurious disturbances such as jostling or ambient vibration in the process environment.    Isolation – Loss-in-weight feeders must be effectively isolated from their environment for accurate weighing. Flexible supply and discharge connections typically suffice for process connections, and appropriate measures may be needed at installation to assure that in-plant vibration is not transmitted to the feeder through its mounts.   Refill - Periodic hopper replenishment is required. During this intentionally brief phase, whether accomplished manually or by an automated system, weight measurement is unavailable due to the inflow of material, temporarily preventing true gravimetric control. For materials whose density does not increase appreciably with increasing headload (such as pellets, for example), feeder speed can be held constant throughout refill. Or, for variable-density powders, granules and the like, feeder speed may be automatically reduced to gradually slow feeder speed during refill, accurately compensating for the effect of increasing headload-related material compaction. (Related info)   Size - Unlike the other two operating principles presented below, the physical size and installation footprint of loss-in-weight feeding systems roughly corresponds to its feed rate range. This makes for a relatively small and compact feeder when handling additives, a major benefit where space is at a premium such as when clustering units over an extruder inlet. However, physical size may become a concern for higher rate installations. High-rate feeders tend to be large, require a correspondingly large installation footprint, and may also require a significant support structure. Because of its high accuracy, innate material handling flexibility and ease of material containment, combined with enabling advances in weighing and control, loss-in-weight feeding has matured to become the dominant approach to gravimetric flow rate control since its introduction nearly 50 years ago.

Cryogenic Deburring or Deflashing Machine Suitable for Deburring Process of Various Components   Cryogenic deburring deflashing machine is specially applied into the various industries including Rubber like rubber rings, sealings, gaskets, bumpers, silicone parts deflashing, engineering thermoplastic like PA+GF PC+GF PPS POM PET PTFE PEEK deburring,thermoelastomer like TPU TPE TPR TPV TPE parts trimming and diecasting part like Zinc alloy and Mag alloy parts flash cleaning. We can get a prefect result after cryogenic deburring, take a look at the following photos. Nanjing Pege will be happy to provide best cryogenic shotblasting machine for your components precision process. 

Advance Rubber Strip Cutter Advance Rubber Strip Cutting Machine Features Rubber sheeting cutter from Nanjing Pege is reliable and qualified for rubber sheet cutting process. Features  1. Use a precision electrical scale can be connected to PLC(see the photo and video, it can be up to 0.02g precision) 2. Larger cutting motor: Using 3.7Kw motor, larger power. 3. Feeding motor: Servo motor, more soft and precise. 4. Cutting blade material is best type-Tungsten Steel W18 5. Frame design: More robust and  6. Safety Protection: Door Safety Switch to improve safety 7. Cutting Speed: can be Max 90 cut/ minute  8. Cutting Strip Thickness can be up to 30mm

Spin Trimming Deflashing Machine PRODUCT DESCRIPTION Design Purpose Remove waste edges/flashes of rubber parts automatically. Operation Principle By using the theory of aerodynamic & centrifugal force, by high speed rotation along with violent hitting against each part. Applications All kinds of rubber parts for a wide range of industry fields. The spin trim deflashing machine is ideal for use in the automotive, oil and gas, aerospace, medical, electronics, and general rubber sectors. Features 1.PLC & HMI control, a plug-and-play equipment, 7.5inch touch screen, user friendly operation panel. 2.Not freezing, no need liquid nitrogen, no molds requirement, only basic labor and electricity, very low manufacturing costs 3.Extremely high output, average as 40~50 workers at the same working time, millions of products can be finished per day 4.Ideal for the effective deflashing of small to medium size rubber parts, especially for the O rings. 5.Divided space room for filling & operation respective, realizes a continuous production 6.Patented Cutting Technology for Closet Wet Trim. A safe, affordable and automated process 7.Automatic Self-Lubrication System for Non-stop Trimming 8.High power and speed motor to ensure reliable performance and stable running.

Nanjing Pege Frozen Shot Cryogenic Deflashing System The whole cryogenic deflashing system includes the LN2 contain system, LN2 transmission system and cryogenic shot blasting deflashing system.  For the LN2 container, customer can choose big tank(about 10M3) or small cylinder(250Liter) according the use volume per day. The machine is placed near the workshop window and tank, the distance between machine and LN2 contain should be short enough to ensure quick LN2 transmission. The pipeline for transmission is suggested to use vaccum stainless pipe to reduce Nitrogen lost and quicker transmision during the operation.   Cryogenic deflashing machines are known for its precise quality de-flashed parts with up to 95% performance output without affecting the final part dimension and shape from small O-rings to big molded parts. These Machines serve the need for Rubber, Metal-Rubber parts, small precision plastic parts and small die-casting parts like Zinc and Managanesium alloy. SPECIFICATIONS PG-40T Size:950mm*950mm*1900mm Weight:500kg Power supply: AC380V 50HZ 3Ph Electrical capacity: 4kw Temperature: -130C--50C Pressure:0.5-0.7Mpa Barrel capacity: 40L Effective capacity:15 Liter Wheel speed: 3000rpm-7200rpm Cooling media: liquid nitrogen Material: SUS304   PG-60T Size:1000mm*1000mm*1950mm Weight:700kg Power supply: AC380V 50HZ 3Ph Electrical capacity: 6kw Temperature: -130C--50C Pressure:0.5-0.7Mpa Barrel capacity: 20L Wheel speed: 3000rpm-7200rpm Cooling media: liquid nitrogen Material: SUS304   PG-80T Size:1100mm*1200mm*2000mm Weight:850kg Power supply: AC380V 50HZ 3Ph Electrical capacity: 7kw Temperature: -130C--50C Pressure:0.5-0.7Mpa Barrel capacity: 80L Effective capacity:30L Wheel speed: 3000rpm-7000rpm Cooling media: liquid nitrogen Material: SUS304   PG-120T Size:1200mm*1250mm*2200mm Weight:1000kg Power supply: AC380V 50HZ 3Ph Electrical capacity: 8kw Temperature: -130C--50C Pressure:0.5-0.7Mpa Barrel capacity: 120L Effective capacity: 40L Wheel speed: 3000rpm-6000rpm Cooling media: liquid nitrogen Material: SUS304   PG-150T Size:1300mm*1350mm*2250mm Weight:1500kg Power supply: AC380V 50HZ 3Ph Electrical capacity: 8kw Temperature: -130C--50C Pressure:0.5-0.7Mpa Barrel capacity: 120L Effective capacity: 50L Wheel speed: 3000rpm-6000rpm Cooling media: liquid nitrogen Material: SUS304

Nanjing Pege Cryogenic Deflashing Machines  PRODUCT DESCRIPTION PROCESSING PRINCIPLE With the decrease of the temperature, rubber/plastic parts enter into hardened, brittle, and crystallized process, its flexibility is gradually lost. It is easily broken by external force when it is under brittle temperature. Flash of the molded products is generally much thinner than finished product itself, it become brittle earlier than product in the low temperature. Cryogenic deflashing machine applies this principle, works in the time range when flash is brittle while products still keeps its flexibility, hit the flashes by high speed projected special plastic media, clear out the brittle burr. The flashes can be easily removed, and the product not be damaged.   FUNCTIONS Our cryogenic deflashing machine is widely used in removing the flashes of small rubber and plastic parts like O-rings, gaskets and other press molded or injection moulding parts. With the cryogenic processing technology, the flashes are firstly frozen and then blasted down by the high-speed projection media (Polycarbonate media). The surface quality of molded rubber and plastic rubber parts can be improved greatly while the product are not damaged.   APPLICATIONS  A. O rings, irregular rubber parts with different material and sizes.  B. Micro electronic product parts  C. Precision elastomeric parts  D. Precision injection moulding plastic parts  E. R & D part runs  F. Die casting products, like zinc aluminum, magnesium alloy   FEATURES High efficiency: The automatic rubber deflashing machine can replace about 60-80 worker to removing the flashes. High precision: It can remove small and hardened flashes which cannot be removed by handworkers and improve precision of the products. Low cost: It also has a feature of lower cost comparing with processing the parts by handworkers.  

Spin Trim Rubber Deflashing Machine for Rubber Rings and Components A whole system combines with one set of spinning machine, a lift for transit, and air blowing separator for efficient blowing separation. This system will greatly improve the deflashing process and the flash separation process. Spin trim deflashing can be suitable for various rubber components, not only O rings, gaskets, but also irregular parts like bumper, damper, blocks, caps or sleeves. Those parts which have tear trim line or groove will be better. Air Blowing separator can slove the flash separation problem and separate the flashes and part perfectly. Spin trim deflashing no need liquid nitrogen, it is a econimical way for rubber parts deflashing comparing with cryogenic deflashing. However, it is a high efficient deflashing method comparing with manual deflashing.  

Nanjing Pege Full Automatic Spin Trimming Deflashing System The spin trim deflashing system contains a set of spin trim machine, a lift and a set of air blowing separator for flash separation. Good quality spin trim deflashing machine can deflash rubber parts at a efficiency of around 1-2kg per minute, 60-100kg per hour. This type of spin trimming machine only consumes power(5KW), compressed air, no need liquid nitrogen, is very economical. Spin trimmer from Nanjing Pege has full safety measures including emergency button, safety grating and protection lid.   Air blowing separator with a lift is an efficient flash separation system. It can separate different shape, size and weight flashes in a quick and efficient way. Connecting with spin trimming machine, the system will be automatic and high efficient.   Pege believes that the spin trimming deflashing system will greatly improve the customer production efficiency and production process result.    

Pege Cryogenic Deflashing Machine for PEEK Implants Deburring Process As a precision plastic parts deburring solution,cryogenic deflashing machine from Nanjing Pege plays an important role in trimming plastic parts including PEEK or PE material medical inplant device or components. Have a check on the perfect deflashing examples of CNC maching PEEK inplant components.