dental machine history

Tablet press tablet press appeared in Europe earlier, there are nearly a hundred years of history. In China in 1949, Shanghai Tianxiang Hua Kee Iron Works imitation caused British 33

Punch tablet press; 1951, according to the U.S. 16-punch tablet machine converted into a domestic 18-punch tablet machine, which is the earliest domestic manufacturing pharmaceutical machinery; 1957, designed and manufactured

ZP25-4 type tableting machine; 1960, to design and manufacture successful 60-30 type tableting machine, with automatic rotation, compression function, pressed varieties tablets, sugar tablets,

Calcium, coffee tablets. Dental Autoclave The same year also design and manufacture a type ZP33, ZP19 type tabletting machine.

In the 1970s began Shanghai Daiichi Pharmaceutical Machinery Factory (Shanghai Tianxiang's predecessor) and Shandong Medical Instrument as compression tableting machine tablet press sentinel manufacturers large

Production ZP series tablet press. "Plan" period, the Department of Aerospace 206 HZP26 successfully developed high-speed tablet presses. In 1980, the Shanghai Pharmaceutical Machinery Factory first system designed to

Made the ZP-21W type tableting machine, to the early 1980s the international advanced level, is the first domestic product. 1987, the introduction of the Federal German Fette company microcomputer control

Manufacturing technology, design and manufacture of P3100-37 rotary tablet press with automatic control tablet weight, pressure, automatic digital film, films and other features automatic elimination of waste, closed

Structured, the degree of purification to GMP requirements. 1997, the annual Shanghai Pharmaceutical Machinery Co., Ltd. Tianxiang Kin developed ZP100 series rotary tablet press, GZPK100 Department

Column speed rotary tablet press.

In the 21st century, with the deepening of GMP certification, in full compliance with the GMP ZP series rotary tablet machine have appeared: Shanghai's ZP35A, Shandong Liaocheng ZP35D

And so on. High-speed rotary tablet machine production, the pressure signal acquisition and rejection and other technology has been developed rapidly, the highest yield is generally greater than 300,000 / hour, the most

Large pre-pressure 20kN, 100kN maximum principal stress 80kN or more. For example, the Beijing Science and Technology Co., Ltd. Sinopharm Long Li GZPLS-620 Series High Speed ​​Rotary Tablet Press,

Shanghai Tianxiang Jian Pharmaceutical Machinery Co. GZPK3000 series high speed rotary tablet press, Beijing Aeronautical Manufacturing Technology Research Institute, PG50 Series High Speed ​​Rotary

Sheet machine.

With the level of curing light manufacturing process technology, automatic control technology to improve and tableting machine manufacturers use a variety of special needs, a variety of special-purpose tablet press

Have also emerged. For example, laboratory ZP5 rotary tablet machine for dry powder tabletting rotary tablet press machine for gunpowder explosion-proof ZPYG51 series tablet

Rotary tablet machine.

dental machine operating principles

The punch and die during tableting by the pressure, common bearing steel (such as crl5 etc.) production, and heat-treated to increase its hardness.

Many types of punch, punch tablet shape determined by the desired shape. Press the structure and shape of the die can be divided into round, shaped (including polygonal and curved);

Punch the shape of a flat-shaped cross-section, bevel-shaped, shallow concave, deep concave and integrated shape. Flat-shaped, bevel-shaped punch for pressing flat cylinder-shaped tablets,

Shallow concave biconvex portable dental unit tablets for pressing, deep concave mainly for press-coated tablets of the chip, integrated shape mainly used to suppress shaped plate-shaped. In order to facilitate the identification and services

Used drugs in the end face of the die can also be engraved the name of the drug, dosage and vertical and horizontal lines and other signs. Suppression of different doses of tablets, you should select the appropriate size of the die

.

(2) tablet press tablet press working process of the work process can be divided into the following steps:

① undershoot punch position (its working position facing up) into the Central die hole in the bottom die hole, seal the hole bottom mold;

② The Araliaceae is to fill in the hole in the mold drugs;

③ punch on the red parts (its working position down) from the falling upper die hole in the die hole and down a certain stroke, the powder into tablets;

④ ascend out of the hole punch, punch up the tablets under the top of the hole in the mold, to complete a tabletting process;

⑤ undershoot down in place, ready for the next fill.

(3) tablet tablets principle mechanism

① dose control. Tablets have various requirements of different doses, the large dose regulation is accomplished by choosing different diameters of the punch die to be achieved, if the diameter 6mm

, 8mm, 11.5mm, 12mm, etc. punch. Die size is selected, the tiny dosage adjustment by adjusting the lower punch inserted into the depth of the hole in the mold, thus changing the back cover

After the actual length of Dental Autoclave the die hole, adjust the die hole filling volume of the drug. Therefore, in the tableting machine should have under the regulation of the die hole punch in the original location of the institution,

Dose adjustment in order to meet requirements. Because different batches of powder preparation total hematocrit differences, this regulation is necessary.

At a dose control, the operation principle of the feeder also has considerable effects, such drugs are by weight of particulate, free-rolled into the die hole, its loading condition

More loose. If using multiple compulsive way into the environment, the die hole will be filled with more drugs, filling the situation is more dense.

② tablet thickness and compaction control. The dose is determined according to pharmacopoeia prescription and can not be changed. For storage, preservation and disintegration time requirements,

Tabletting pressure of a dose is also a requirement, it will influence the actual thickness and appearance of the tablet. Tableting pressure regulation is essential. This is done by

Adjusting the upper punch holes in the mold downlink capacity to achieve. Some compression tableting machine during operation only on the red down, but also to act as a lower washed by

Relative motion upper and lower punches together to complete the tabletting process. But mostly by adjusting the pressure regulator on the red down the amount of pressure regulating agencies to implement and control.

why pulpitis unbearable toothache

Dental pulp bit dry central location, the outer layer from the enamel, dentin and cementum encircled the only hole in the very tip associated with periapical tissue; pulp nerve from the trigeminal nerve, medullary cavity nerve fiber stress threshold is low, its susceptibility to strong pressure, and pulp tissue itself inherently tissue pressure than other organs tissue pressure is high. When the pulp first arterial vasodilatation inflammation, congestion, resulting pulp increased internal pressure in the cavity, so that the apical hole by compression of the vein, causing venous Dental Autoclave congestion, so that the exudate accumulation, due to the very tip through a small hole contact with the outside, so that poor drainage, poor blood supply, resulting pulp nutritional disorders, can cause pulp necrosis. Necrotic tissue and releases more inflammatory product, to make more vascular leakage increased intramedullary pressure is further increased, coupled with the pulp is enclosed in a rigid cavity inelastic, that is surrounded by the pulp tissue solid tooth structure, medullary cavity space capacity is constant, with no room for a buffer, increased oppression of pulp nerve pressure, it will have severe pain, with the pulp cavity pressure increases, further aggravating the pain, and thus This pain is really unbearable, the majority of patients have painful toothache Jane up vital experience.

new growth two front teeth do not rely rope how to do

new growth two front teeth do not rely rope how to do?
New growth two front teeth do not rely rope how to do? New growth often appear dentition maxillary two gates (incisors) teeth between the large joints, can not move closer. Parents do this very anxious. It can be divided into two situations: one is temporary and normal phenomenon in early mixed dentition, the gap with both sides of the lateral incisor and canine eruption will gradually disappear; Another situation is caused by pathological factors, such as: two incisor teeth big ambush between multiple Dental Autoclave teeth exist, the gap between the front teeth does not go away, should go to the doctor immediately. Therefore, when the two front teeth delays closer, they should seek help children dentist checks, such as abnormal, need early treatment.

the formation of dental fluorosis is how the

Fluoride is a chemical element, like vitamins, is an essential trace element for human body. Water at 0.5 to 1 mg / l concentration, dental hand piece the development of the teeth and bones

Helpful, if more than this concentration, or exceeding the tolerance dose of fluoride tooth, can cause enamel fluorosis. The higher fluorine content of drinking water, drinking when

The longer, more severe dental fluorosis. Dental Autoclave Dental fluorosis popular all over the world, outside of China except Shanghai, municipalities and autonomous regions are scattered in the treatment of fluorosis areas.
As belonging to a particular dental fluorosis caused by environmental factors, another feature is the calcification of tooth development, fluoride to work. If to 8 years of age, in addition to the third constant

Molars, all of the permanent teeth calcification basically completed at this time, even then migrate to high fluoride areas of life, it will not have a dental fluorosis.