摘要:
The invention relates to a process and a device for dispensing a predetermined amount of a liquid substance into a vessel.The device comprises a pipette (1) provided with a piston (5) for pumping of the liquid substance, a sleeve (19) for cooling the lower tube (2) of the pipette and means (23,24,25) for cutting the thread (40) of frozen substance leaving the calibrated tube when pressure is applied on the piston.Application to measuring out of reagents in laboratory analyses.
摘要:
A method for dividing a block of deep-frozen foodstuffs, especially fish fillets, into portions of predetermined size. The method utilizes a operating temperature between -6.degree. C. and -30.degree. C. and a processing pressure of at least 100 at. In the method, the block is squeezed in a first direction, preferably perpendicular to its largest or greatest surface, through a blade lattice formed of parallel knives. The plates formed by squeezing the block through the first blade lattice are carved into portions of desired size by performing second cuts perpendicular to the first cuts. The second cuts are preferably perpendicular to the largest surface of the original block. In a preferred embodiment, the second cuts are performed by squeezing the plates through a second blade lattice formed of parallel knives. As the block or plates are being squeezed through the blade lattice, they can be squeezed in another direction perpendicular to the direction of squeezing to increase their height. An apparatus for performing the described method is also disclosed.
摘要:
Method of making fibers suitable for making a hair brush includes a matrix or pad made of a flexible material and a plurality of relatively rigid, single natural-type bristles having their lower ends anchored by flexible, sleevelike members projecting upward from the matrix. Also disclosed is a method of forming the bristles which includes comminuting natural bristles at a low temperature and then forming a thick slurry of the comminuted bristles and a binder, which is then molded and cured to form bristles having improved characteristics.
摘要:
A method of machining a solid material which has a vapor pressure curve which defines a phase boundary between the solid and the gaseous state at a temperature and pressure below the ''''Triple'''' point comprises, subjecting the solid to an energy beam at a temperature and pressure below the Triple point to cause the solid to become immediately transformed into a gaseous state, that is, to become sublimated.
摘要:
A method and apparatus for obtaining highly uniform slices of gel containing bands of RNA by freezing the gel in a cylindrical tube and then introducing the frozen cylindrical gel into a cylindrical sample handling mechanism and a gel slicing apparatus. The gel slicing apparatus has a sub-zero brine bath that surrounds the sample handling mechanism to maintain the frozen gel in a frozen state. The gel slicing apparatus includes a crank, drive screw and plunger positioned to drive the frozen sample. The crank is turned one revolution which forces part of the frozen sample out of the sample handling mechanism a predetermined amount. The extended sample is sliced off and then subjected to analysis. The process is then repeated until all of the frozen sample has been sliced.
摘要:
Continuous textile filamentary material is converted into a web of short fibers of graduated length by shattering the filaments in an air jet stream of a velocity which is at least 1.5 times sonic velocity, at a calculated temperature of not over -100*F.; diffusing the resultant short fibers into a plenum chamber; and collecting the fibers in web form on a conveyor.
摘要:
Thin metallic material is selectively cut by apparatus which subjects the material to complementary alternate displacement of a few microinches in a direction normal to its generally flat planar surface, the material stresses thus generated causing the metal to change state and fracture along the line of alternate displacement, the change in state occurring without the loss or distortion of material at the fracture.
摘要:
Soft plastic strands are cut by means of opposed ratchet-type gears which have intermeshing generally radially extending faces of gear teeth. Such cutters are generally simple and selfcleaning.