Press Laboratory Presses

Product Description

NATIONAL's 1 & 2 Ton Presses feature a unique laboratory press design combined with the same unibody construction and other features common to our Press line. We have redesigned these laboratory presses to maximize the sensitivity of the press for exact reproducibility of applied force. Normally, hydraulic lab presses use a pump to apply pressure to the piston of the hydraulic cylinder. The hydraulic fluid pump found in standard lab press designs increases the pressure of the hydraulic fluid in spurts which causes the force being applied by the press to jump in increments which are difficult to control with precision. In addition, there is some backflow of hydraulic fluid during the pumping process which amplifies the lack of reproducibility of force levels.

Many applications for low pressure laboratory presses such as intrinsic ingredients dissolution analysis require the application of highly reproducible force levels, and 12 ton hydraulic presses are inherently unsuited to these applications. By removing the pump and sealing the hydraulic cylinder, we have created a press which enables application of very small increments of force levels which can be reproduced with a high degree of precision from sample to sample and without pressure drops. The force is applied to the sealed cylinder by turning the lead screw assembly against the platen on which the die is seated, similar to the manner that a wine press operates. Since the force levels are very low, very little effort is required to turn the lead screw. These lab presses are equipped with clamps which allow them to be anchored to any bench top and easily moved to different locations within the lab and they can also be bolted to a lab bench using the fixtures provided with the press. When used with NATIONAL's intrinsic dissolution analysis dies or NATIONAL's Macro-Micro dies, the dies are automatically centered in the press. Note that special short profile Macro-Micro dies are required for this press. The 1 and 2 Ton Press can also be used with NATIONAL's 2mm, 4mm and 7mm die sets and die centering inserts are available for the smaller die sets. Also available in high profile version for applications such as Wood apparatus intrinsic dissolution testing.

Part No.	Description
43212-7417	2 Ton Press laboratory press with safety shields. Daylight opening 2.5". Shipping weight approximately 60 pounds.
43212-7760	1 Ton Press laboratory press with safety shields. Daylight opening 2.5". Shipping weight approximately 60 pounds.
43212-7825	Intrinsic dissolution die sets with 6 dies and 6 flat bottom beakers.
43212-8092	Intrinsic dissolution die sets with 2 dies and 2 flat bottom beakers.
43212-8093	Die centering insert for 2mm, 4mm and 7mm die sets

 

Precision and Reliability for Laboratory Testing

Discover laboratory presses engineered for accuracy and dependability. With digital controls, adjustable speed, and robust construction, these machines deliver consistent and precise results for diverse testing requirements in laboratories, institutes, and research facilities. Their overload protection and safety features address essential operational safety standards.


Versatile Hydraulic Operation for Various Needs

Choose between manual and automatic models to suit your workflow. The hydraulic pressing method ensures even force distribution on the rectangular plates, making sample preparation efficient and repeatable. The mild steel frame and intelligent safety systems guarantee longevity and minimal maintenance.