The process and principle of tablet press

Die is an important task of the tablet machine components, usually including a pair of die, in the mold, the impact on three parts, rushed up and down the structure similar to that of the punch diameter are equal, the upper and lower diameter of punch and die die in combination, can free sliding up and down, in the die hole in but can not exist leakage clearance of powder. According to the punching die structure can be divided into circular shape, special-shaped ( Including polygon and curvilinear form) 。 Punch the shape of the face is flat, bevel edge shape, shallow concave, deep concave and comprehensive shape, flat shape, hypotenuse punch is used to suppress flat cylinder shape tablets, shallow concave to neutralize biconvex tablet, deep concave mainly suppress coating tablet chip, integrated form is mainly used to suppress special-shaped tablets. To facilitate the identification and taking drugs, on the die face can also print out the name of drug, dose, and vertical and horizontal lines, etc. Suppression of different doses of the tablets, should choose appropriate to the size of the die. The working process of the tablet press: the working process of the tablet press can be divided into the following steps: 1, the punch down parts ( Its working position up) By die hole in the bottom into the die, die hole bottom seal; 2, the use of the feeder to filling in the die hole drugs; 3, in the punch parts ( The work location down) Since the fall into the upper die in the die hole, and downward stroke, the powder to suppress piece; 4, in ascending out of the hole. Down rising tablets out of die hole, complete a pelleting process; 5, down to the in situ, prepare the next filling. Dose control various tablet have different doses, large dose adjustment is by choosing different punch the diameter of the die. After selected die size, small dose adjustment is through the adjustment of rushed into the depth of the die, which changes after the back cover of the actual length of the die hole, to achieve the purpose of regulating drugs in the die filling volume. Therefore, under the tableting machine to have impact on the original location of the setup of the die in order to satisfy the requirement dose adjustment. The thickness of the tablets and the degree of compaction control the dosage is set according to the prescription and pharmacopoeia, cannot be changed. Storage-transpor-tation, save and disintegration time limit requirements, in order to pressure for a little pressure on dose is required, it will also affect the actual thickness and appearance of pills. Pressure for pressure regulation is necessary. This is by adjusting the impact on the amount of downward in the die. Some tablet press down on tableting process not only have action, at the same time also can have upward movement, it ran down from the upper and lower relative motion complete tableting process together. But pressure regulation is rushed down on by adjusting the quantity of institutions to implement pressure regulation and control. Die installation: (1) installed in a spin panasonic under fixed screw, turn the handwheel to impact and core rod reaches the high position and under the push rod inserted into a slot in the punching core rod under ( Pay attention to the gap of the push rod caused by slope down fastening screws, and I will put the end) After tighten the set screw. 2 installed under blunt: unscrew the fastening nut, rush on the core rod core rod inserted in a hole, should extend to the end, stuck in a core with a wrench on the lower lever of the six parties, tighten fastening nut. (3) installation mode: unscrew the die set screw, take in the mould flat bedplate of the hole, the in the mould at the same time brought down into the mold, according to the hole and then tighten the set screw. Put in the mold when must pay attention to take in the mould flat, lest skewed into jam, damage the hole wall. (4) turn the handwheel by hand, so that in slow decline into the die, the observation for the collision or friction, if collision or friction, the loosening of the bedplate of die set screw ( Two) , adjustment of mould bedplate fixed position, make rushed into the die hole, then tighten the mould counter set screw, such adjustments until into the upper punch die without collision or friction party qualified to install. 2, the adjustment of the turn the handwheel pushed down, to the high position, observe whether a gushing under the surface with qi (model plane phase in the Or high or low will influence the piece) If not neat unscrew the butterfly screws loosen adjusting gears, the gear plate to move in to make the model plane phase in the gaunt face and qi, and then will platen press, tighten the thumb screws. At this point, use hand hand wheel, run idle more than ten, if the machine working normally, can feed pressure testing, for the next step adjustment. 3, the adjustment of the depth of the filling, The pills weight adjustment) Unscrew the butterfly screws loosen the gear plate. The rotation adjustment gear to the left to make down the core rod rise, the filling depth reduction ( Pills weight) 。