Molded fiber or molded pulp is the process for producing, strong, and environmentally friendly food and protective packaging. The molded fiber packaging is made from 100% recycled paper including newspaper, magazine, paper, and any product made of paper fibers as well as biodegradable plant-based products. Drink carriers, egg carriers, or filler flats are commonly used molded fiber products where vacuum is required.
This vacuum application is evolving as there is continued pressure to switch from plastic and polystyrene packaging because molded fiber is a renewable and recyclable resource that is environmentally friendly.
Suction Capacity: 150 to 3,000 ACFM (250 to 5,100 m3/h)
Vacuum Range: to 1 inHgA (to 33 mbar abs.)
NASH vacuum systems are applied in molded fiber processing to save energy and provide reliable solutions. Therefore, production is optimized in molded fiber processing with NASH liquid ring vacuum pumps.
Liquid ring vacuum pumps are durable solutions for challenging process applications, such as molded fiber. These pumps are specifically designed to excel in applications requiring positive backpressure. Thus, vacuum is applied in the manufacturing of molded fiber in two separate processes.
The first process, known as traditional, begins when water and recycled fibers, which include newspapers, corrugated and other specialty fibers are combined in a vat resembling a large blender. Once the fibers are combined in the vat a slurry is created and the paper fibers are suspended in water. The slurry is pumped into the forming station. Screened and vented tooling is lowered into the slurry tank. NASH vacuum pumps are activated and draw the slurry through the screen trapping the fibers onto the screen. The water is pumped back into a holding tank to be used again later. The formed fibers are transferred onto a conveyor and dried in a precisely controlled oven. Molded fiber product comes out dry and ready for shipment.
The second type of molded fiber process where vacuum is applied is thermoformed. Thermoformed process utilizes the same first step as mentioned above in the traditional process; however, the second step requiring vacuum differs in that the slurry is pumped into the forming station. Screened and vented tooling is lowered into the slurry tank.
The NASH liquid ring vacuum pump is activated and draws the slurry through the screen trapping the fibers onto the screen. The water is pumped back into a holding tank to be used again later. The fibers, now on a screen, are pressed in matched polished molds that are precisely in the form factor of the desired product. With heat and pressure, the water is pressed and evaporated out of the fibers.
• External mechanical seals provide flexibility and ease of maintenance
• Direct drive speeds for 50/60 Hz motors for worldwide use
• Extended pressure ratings have the ability to handle tough applications where backpressure is required
• Conical design to better handle water/particulate slugs and residual gases
• One moving part for long time reliability
• Variable port design for high efficiency
• Patented gas scavenging to increase performance at high vacuum levels
• Factory performance tested and trouble-free start-up and operation
NASH VectraPak liquid ring vacuum systems are backed by a 2-year warranty and over 100 years of vacuum experience. All NASH liquid ring vacuum pumps are tested at the factory prior to being released to the field.
NASH CERTIFIED™ experts are readily available to provide aftermarket support including maintenance, service, parts, and repair. Service centers are globally located to protect your vacuum system investment and provide quality, reliable and efficient solutions.