{"id":360,"date":"2021-11-26T17:33:00","date_gmt":"2021-11-26T17:33:00","guid":{"rendered":"https:\/\/dev.gseo.dev\/sedpharma\/what-is-freeze-dryer%ef%bc%9f\/"},"modified":"2022-11-15T23:56:27","modified_gmt":"2022-11-15T23:56:27","slug":"what-is-freeze-dryer","status":"publish","type":"post","link":"https:\/\/dev.gseo.dev\/sedpharma\/news-events\/what-is-freeze-dryer\/","title":{"rendered":"What is Freeze Dryer\uff1f"},"content":{"rendered":"<p style=\"line-height: 1.5em; text-align: center;\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone  wp-image-361\" src=\"https:\/\/dev.gseo.dev\/sedpharma\/wp-content\/uploads\/2022\/07\/d1cbcfeafeef3b7fcd44449243d2c1e6-300x190.jpg\" alt=\"Freeze dryer\" width=\"945\" height=\"599\" srcset=\"https:\/\/dev.gseo.dev\/sedpharma\/wp-content\/uploads\/2022\/07\/d1cbcfeafeef3b7fcd44449243d2c1e6-300x190.jpg 300w, https:\/\/dev.gseo.dev\/sedpharma\/wp-content\/uploads\/2022\/07\/d1cbcfeafeef3b7fcd44449243d2c1e6.jpg 480w\" sizes=\"auto, (max-width: 945px) 100vw, 945px\" \/><\/p>\n<p style=\"line-height: 1.5em; margin-bottom: 10px;\"><span style=\"font-size: 16px;\">The freeze dryer is based on vacuum freeze drying technology and is widely used in the fields of medicine, biological products, food blood products, and active substances.<\/span><\/p>\n<h2><span style=\"font-size: 24px;\"><em><strong>Fundamental of Freeze Dry System<\/strong><\/em><\/span><\/h2>\n<p style=\"line-height: 1.5em; margin-bottom: 10px;\"><span style=\"font-size: 16px;\">The basic principle of vacuum\u00a0freeze dry system is based on the three-state change of water. Water has solid, liquid and gaseous states, and the three states can be converted to each other and can coexist.\u00a0When water is at the triple point (temperature of 0.01\u2103 and water vapor pressure of 610.5Pa), water, ice, and water vapor can coexist and balance each other.<\/span><\/p>\n<p style=\"line-height: 1.5em; margin-bottom: 10px;\"><span style=\"font-size: 16px;\">In the high vacuum state, the sublimation principle is used to make the water in the pre-frozen materials directly sublimate into the ice state to be removed without the melting of ice, so as to achieve the purpose of freeze drying.<\/span><\/p>\n<p style=\"line-height: 1.5em; margin-bottom: 10px;\"><span style=\"font-size: 16px;\">Freeze-dried products are sponge-like, no shrinkage, excellent rehydration, and very little moisture. After corresponding packaging, they can be stored and transported at room temperature for a long time.<\/span><\/p>\n<h2><span style=\"font-size: 24px;\"><em><strong>The Structure of Vacuum Freeze Drying Machine<\/strong><\/em><\/span><\/h2>\n<p style=\"margin-bottom: 10px; line-height: 1.5em;\"><span style=\"font-size: 16px;\">The vacuum freeze dryer consists of a drying box, a refrigeration system, vacuum system, a media heat exchange cycle system, an automatic control system, a pneumatic system, and an in-place cleaning and disinfection system.<\/span><\/p>\n<p style=\"text-align: center;\"><img loading=\"lazy\" decoding=\"async\" style=\"width: 793px; height: 397px;\" title=\"freeze dryer diagram\" src=\"https:\/\/dev.gseo.dev\/sedpharma\/wp-content\/uploads\/2022\/07\/7f73879a3f8ea2ad73a9e2e48dfe0b8b.jpg\" alt=\"freeze dryer diagram\" width=\"793\" height=\"397\" \/><\/p>\n<p style=\"text-align: center;\"><em>Structure of <em style=\"text-align: center; white-space: normal;\">freeze dryer\u00a0<\/em><\/em><\/p>\n<p style=\"text-align: center;\">\n<h3><span style=\"font-size: 16px;\"><em><strong>Vacuum Drying Oven<\/strong><\/em><\/span><\/h3>\n<p style=\"margin-bottom: 10px; line-height: 1.5em;\"><span style=\"font-size: 16px;\">The industrial vacuum drying oven is a vacuum-sealed low-pressure container. The materials are all made of stainless steel, which can withstand positive and negative pressures and meet the requirements of steam sterilization from the heat sterilizer. In order to meet the sealing requirements, high-temperature and low-temperature resistant silicone rubber is used, and the insulation layer is made of closed-cell elastic thermal insulation materials.<\/span><\/p>\n<p style=\"margin-bottom: 10px; line-height: 1.5em;\"><span style=\"font-size: 16px;\">The electric drying oven is mainly composed of a box body, a shelf and a door. The box body is equipped with a pressure gauge, a temperature-measuring resistor, a gas release valve, a gas permeation valve, a safety valve, and a spray inlet connector.<\/span><\/p>\n<h3><span style=\"font-size: 16px;\"><em><strong>Media Heat Exchange Circulation System<\/strong><\/em><\/span><\/h3>\n<p style=\"line-height: 1.5em; margin-bottom: 10px;\"><span style=\"font-size: 16px;\">The energy required for cooling and heating of the food is driven by the circulating pump and transmitted to the shelf through the heat exchange medium, and then to the food.<\/span><\/p>\n<p style=\"line-height: 1.5em; margin-bottom: 10px;\"><span style=\"font-size: 16px;\">The source for food cooling is provided by the refrigeration system of the\u00a0<\/span><a style=\"font-size: 16px; text-decoration: underline;\" href=\"https:\/\/dev.gseo.dev\/sedpharma\/product\/laboratory-freeze-dryer-lyophilizer-for-small-scale-sed-xdg-a\/\" target=\"_self\" rel=\"noopener\"><strong><span style=\"font-size: 16px;\">dryer dehydrator<\/span><\/strong><\/a><span style=\"font-size: 16px;\">, and the heating source for food is provided by the heating tank. The switch between cooling and heating is completed by controlling the electromagnetic valve switch of the cold source and the heat source.<\/span><\/p>\n<p style=\"line-height: 1.5em; margin-bottom: 10px;\"><span style=\"font-size: 16px;\">When the temperature rises, the steam enters the heating tank to heat the medium. At the same time, the pneumatic three-way regulating valve is used to adjust the mixing ratio of the heat medium from the heating tank and the return heat medium of the shelf, and control the opening and closing of the cooling water solenoid valve of the plate heat exchanger to control the shelf temperature.<\/span><\/p>\n<h3><span style=\"font-size: 16px;\"><em><strong>Automatic Control System<\/strong><\/em><\/span><\/h3>\n<p style=\"line-height: 1.5em;\"><span style=\"font-size: 16px;\">The system has functions such as freeze-drying curve setting, vacuum pump test and control, media temperature, food temperature water trap temperature control, dry state detection, in-place cleaning and sterilization, automatic protection and alarm functions.<\/span><\/p>\n<h3><span style=\"font-size: 16px;\"><em><strong>Pneumatic System<\/strong><\/em><\/span><\/h3>\n<p><span style=\"font-size: 16px;\">Controlling\u00a0pneumatic valves.<\/span><\/p>\n<h3><span style=\"font-size: 16px;\"><em><strong>In-place Cleaning and Disinfection System<\/strong><\/em><\/span><\/h3>\n<p><span style=\"font-size: 16px;\">Used for cleaning and steam sterilization of dry box water traps.<\/span><\/p>\n<h2 style=\"line-height: 1.5em;\"><span style=\"font-size: 24px;\"><em><strong>Types of Freeze Dryers<\/strong><\/em><\/span><\/h2>\n<p style=\"line-height: 1.5em;\"><span style=\"font-size: 16px;\"><em><strong>By structure:<\/strong><\/em><strong>\u00a0<\/strong><\/span><span style=\"font-size: 16px;\">bell-jar type freeze-drying machine &amp; in-situ freeze-drying machine<\/span><\/p>\n<p style=\"margin-bottom: 10px; line-height: 1.5em;\"><strong><em><span style=\"font-size: 16px;\">1. Bell-type Freeze Dryer<\/span><\/em><\/strong><\/p>\n<p style=\"margin-bottom: 10px; line-height: 1.5em;\"><span style=\"font-size: 16px;\">This type of industrial vacuum dryer requires manual operation to transfer the material from the pre-freezing chamber to the vacuum freeze-dry chamber when the material is transferred to the drying process at the end of the pre-freezing.<\/span><\/p>\n<p style=\"margin-bottom: 10px; line-height: 1.5em;\"><span style=\"font-size: 16px;\">The bell jar type is most used as a <a href=\"https:\/\/dev.gseo.dev\/sedpharma\/product\/laboratory-freeze-dryer-lyophilizer-for-small-scale-sed-xdg-a\/\" target=\"_blank\" rel=\"noopener\"><strong>lab freeze dryer<\/strong><\/a>. Compared with the production vacuum freeze dryer machine for sale, their structure is simpler and the cost is low.<\/span><\/p>\n<p style=\"margin-bottom: 10px; line-height: 1.5em;\"><span style=\"font-size: 16px;\">The freeze-drying room uses a transparent glass cover to facilitate the observation of the freeze-drying of the materials.<\/span><\/p>\n<p style=\"margin-bottom: 10px; line-height: 1.5em;\"><strong><em><span style=\"font-size: 16px;\">2. In-situ Freeze Dryer<\/span><\/em><\/strong><\/p>\n<p style=\"margin-bottom: 10px; line-height: 1.5em;\"><span style=\"font-size: 16px;\">The freeze drying chamber and the cold trap are two independent chambers. The shelf in the freeze-drying chamber has a refrigeration function. After the materials are placed in the freeze-drying chamber, the pre-freezing and drying process of the materials does not require manual operation.<\/span><\/p>\n<p style=\"margin-bottom: 10px; line-height: 1.5em;\"><span style=\"font-size: 16px;\">The production process of this type of freeze vacuum drying equipment is complicated and the manufacturing cost is high. However, the in-situ freeze dryer is the development direction of the freeze dryer and is an ideal choice for exploring the freeze drying process. It is especially suitable for freeze-drying of medicines, biological products and other special products.<\/span><\/p>\n<p><span style=\"font-size: 16px;\"><em><strong>By function:<\/strong><\/em> <\/span><span style=\"font-size: 16px;\">Ordinary shelf type freeze dryer &amp; multi-manifold type freeze dryer<\/span><\/p>\n<p style=\"line-height: 1.5em; margin-bottom: 10px;\"><strong><em><span style=\"font-size: 16px;\">1. Ordinary Shelf Type<\/span><\/em><\/strong><\/p>\n<p style=\"line-height: 1.5em; margin-bottom: 10px;\"><span style=\"font-size: 16px;\">The materials are packed in bulk trays. This freeze dryer is suitable for Chinese herbal medicine, and powder materials.<\/span><\/p>\n<p style=\"line-height: 1.5em; margin-bottom: 10px;\"><span style=\"font-size: 16px;\">Type with capping device: suitable for drying cillin bottled materials. When preparing for freeze-drying, divide the materials into cillin bottles as needed, and freeze-dry the cap after the cap is closed. After drying, the capping mechanism is operated to press the cap tightly, which can avoid secondary pollution, re-absorb moisture, and is easy to store for a long time.<\/span><\/p>\n<p style=\"margin-bottom: 10px; line-height: 1.5em;\"><strong><em><span style=\"font-size: 16px;\">2. Multi-manifold Type<\/span><\/em><\/strong><\/p>\n<p style=\"margin-bottom: 10px; line-height: 1.5em;\"><span style=\"font-size: 16px;\">The use of this lyophilizer needs to connect the flask outside the drying room to dry the material spin-frozen on the inner wall of the bottle. At this time, the flask is connected to the manifold outside the drying box as a container, and the materials in the flask are heated to room temperature. Through the multi-manifold switch device, the flask can be removed or installed at any time as needed without stopping the machine.<\/span><\/p>\n<p style=\"line-height: 1.5em; margin-bottom: 10px;\"><span style=\"font-size: 16px;\">The freeze dry machine with pre-freezing function, and the pre-freezing and drying of the ma<\/span><span style=\"font-size: 16px;\">terials in the freeze-drying process are all completed on the freeze drying machine. The freeze dryer is highly efficient and saves the cost of low-temperature refrigerators.<\/span><\/p>\n<p style=\"text-align: center;\"><img loading=\"lazy\" decoding=\"async\" style=\"width: 755px; height: 466px;\" title=\"Vacuum Freeze Drying Machine\" src=\"https:\/\/dev.gseo.dev\/sedpharma\/wp-content\/uploads\/2022\/07\/c0cf1f1a1a3dbef3ed22cbbcdf10a00c.jpg\" alt=\"Vacuum Freeze Drying Machine\" width=\"755\" height=\"466\" \/><\/p>\n<p style=\"text-align: center;\"><em>\u00a0Vacuum freeze dryer for food SED-DG series<\/em><\/p>\n<h2 style=\"line-height: 1.5em;\"><span style=\"font-size: 24px;\"><em><strong>How Does Freeze Dryer Work\uff1f<\/strong><\/em><\/span><\/h2>\n<p style=\"margin-bottom: 10px; line-height: 1.5em;\"><span style=\"font-size: 16px;\">The process steps of freeze drying equipment include three stages: pre-freezing, sublimation and re-freezing. The use of industrial dryer machine can reasonably shorten the freeze-drying cycle of production and has obvious economic value.<\/span><\/p>\n<h3><strong><em><span style=\"font-size: 16px;\">Freezing of Products<\/span><\/em><\/strong><\/h3>\n<p style=\"margin-bottom: 10px; line-height: 1.5em;\"><span style=\"font-size: 16px;\">There are two ways to pre-freeze drugs in the lyophilizer for sale: one is to cool the product and the drying box at the same time; the other is to wait for the shelf of the drying oven to cool down to about 40 \u2103 and then put the products into the dryer. The former is equivalent to slow freezing, while the latter is between quick freezing and slow freezing. Therefore, the latter is often used to give consideration to both freeze-drying efficiency and product quality.<\/span><\/p>\n<h3><strong><em><span style=\"font-size: 16px;\">Conditions and Speed of Sublimation<\/span><\/em><\/strong><\/h3>\n<p style=\"margin-bottom: 10px; line-height: 1.5em;\"><span style=\"font-size: 16px;\">Ice can begin to sublime when the saturated vapor pressure at a certain temperature is greater than the water vapor pressure of the environment; the suction and capture of water vapor by the condenser, which is lower than the product temperature, is a necessary condition for maintaining sublimation.<\/span><\/p>\n<p style=\"margin-bottom: 10px; line-height: 1.5em;\"><span style=\"font-size: 16px;\">The temperature of the product and condensation is usually 25\u00b0C and 50\u00b0C. The saturated vapor pressure of ice at this temperature is 63.3Pa and 1.1Pa, respectively, so a considerable pressure difference is generated between the sublimation surface and the condensation surface.\u00a0At this time, the partial pressure of the non-condensable gas in the system can be ignored, and the pressure difference will cause the water vapor sublimated from the product to reach the surface of the condenser at a certain flow rate and form frost.<\/span><\/p>\n<h3><strong><em><span style=\"font-size: 16px;\">Sublimation Freeze Drying process<\/span><\/em><\/strong><\/h3>\n<p style=\"margin-bottom: 10px; line-height: 1.5em;\"><span style=\"font-size: 16px;\">In the first stage of heating (mass sublimation stage), the product temperature is lower than its eutectic point by a range.<\/span><\/p>\n<p style=\"margin-bottom: 10px; line-height: 1.5em;\"><span style=\"font-size: 16px;\">In the large-scale sublimation process, although the temperature of the shelf and the product is very different, because the plate temperature, condenser temperature and vacuum temperature are basically unchanged, the sublimation heat absorption is relatively stable, and the product temperature is relatively constant.<\/span><\/p>\n<p style=\"margin-bottom: 10px; line-height: 1.5em;\"><span style=\"font-size: 16px;\">The presence of ice crystals can no longer be seen with the naked eye, indicating that more than 90% of the water has been removed at this time, and the process of substantial sublimation has basically ended.\u00a0<\/span><\/p>\n<p style=\"margin-bottom: 10px; line-height: 1.5em;\"><span style=\"font-size: 16px;\">In order to ensure that a large amount of sublimation of the whole box of products is completed, the plate temperature still needs to be maintained for a stage before the second stage of heating.<\/span><\/p>\n<h2 style=\"line-height: 1.5em;\"><span style=\"font-size: 24px;\"><em><strong>What is a\u00a0Freeze Dryer Used For\uff1f<\/strong><\/em><\/span><\/h2>\n<p style=\"margin-bottom: 10px; line-height: 1.5em;\"><strong><span style=\"font-size: 16px;\">Biological Products, medicines:<\/span><em><span style=\"font-size: 16px;\">\u00a0<\/span><\/em><\/strong><span style=\"font-size: 16px;\">such as the preservation of antibiotics, antitoxins, supplies and vaccines.<\/span><\/p>\n<p style=\"line-height: 1.5em; margin-bottom: 10px;\"><strong><span style=\"font-size: 16px;\">Biological Tissues and Biological Specimens:\u00a0<\/span><\/strong><span style=\"font-size: 16px;\">such as dry preservation of skin, bones, aorta, heart valves and other marginal tissues used for animal xenotransplantation or allogeneic transplantation; production of various animal and plant specimens.<\/span><\/p>\n<p style=\"line-height: 1.5em; margin-bottom: 10px;\"><strong><span style=\"font-size: 16px;\">Nutritional products, especially high-level nutritional products and Chinese herbal medicines:<\/span><em><span style=\"font-size: 16px;\">\u00a0<\/span><\/em><\/strong><span style=\"font-size: 16px;\">such as royal jelly, honey, pollen, Chinese herbal preparations, etc., the use of freeze dryers is increasing.<\/span><\/p>\n<p style=\"line-height: 1.5em; margin-bottom: 10px;\"><strong><span style=\"font-size: 16px;\">Microorganisms and Algae:<\/span><em><span style=\"font-size: 16px;\">\u00a0<\/span><\/em><\/strong><span style=\"font-size: 16px;\">such as long-term preservation of various bacteria, yeasts, enzymes, protozoa, microalgae, etc.<\/span><\/p>\n<p style=\"line-height: 1.5em; margin-bottom: 10px;\"><strong><span style=\"font-size: 16px;\">Drying Machine for Food:<\/span><\/strong><em><strong>\u00a0<\/strong><\/em><span style=\"font-size: 16px;\">such as coffee, tea, meat, fish and eggs, seaweed, fruits, vegetables, seasonings, tofu, convenience foods, etc.<\/span><\/p>\n<p style=\"text-align: center;\"><img loading=\"lazy\" decoding=\"async\" class=\"\" title=\"1 application of SED-DG Series Food Vacuum Freeze Drying Machine.jpg\" src=\"https:\/\/dev.gseo.dev\/sedpharma\/wp-content\/uploads\/2022\/07\/bb6a651ca6fb5994a73087caf8abd738.jpg\" alt=\"1 application of SED-DG Series Food Vacuum Freeze Drying Machine.jpg\" width=\"842\" height=\"672\" \/><\/p>\n<h2 style=\"line-height: 1.5em;\"><span style=\"font-size: 24px;\"><em><strong>What are the Advantages of Freeze Drying?<\/strong><\/em><\/span><\/h2>\n<p style=\"margin-bottom: 10px; line-height: 1.5em;\"><span style=\"font-size: 16px;\">The freeze drying method is basically carried out below 0\u00b0C, that is, the product is carried out in a frozen state, and generally does not exceed 60\u00b0C during drying.<\/span><\/p>\n<p style=\"line-height: 1.5em; margin-bottom: 10px;\"><span style=\"font-size: 16px;\">Under vacuum conditions, when the water vapor is directly sublimated, the drug remains in the frozen ice shelf, forming a sponge-like loose porous structure, so its volume is almost unchanged after drying.<\/span><\/p>\n<h3 style=\"line-height: 1.5em;\"><strong><em><span style=\"font-size: 16px;\">Advantages of Freeze Drying Process<\/span><\/em><\/strong><\/h3>\n<p style=\"margin-bottom: 10px; line-height: 1.5em;\"><span style=\"font-size: 16px;\">1. Many heat-sensitive substances will not be denatured or inactivated.<\/span><\/p>\n<p style=\"line-height: 1.5em; margin-bottom: 10px;\"><span style=\"font-size: 16px;\">2. During the freeze-drying process, the growth of microorganisms and the action of enzymes cannot proceed, so the original properties can be maintained.<\/span><\/p>\n<p style=\"line-height: 1.5em; margin-bottom: 10px;\"><span style=\"font-size: 16px;\">3. Because the product is dried in a frozen state, the volume of the product is almost unchanged, and the original structure is maintained without concentration.<\/span><\/p>\n<p style=\"line-height: 1.5em; margin-bottom: 10px;\"><span style=\"font-size: 16px;\">4. Since the drying process is carried out under vacuum, there is very little oxygen, so some easily oxidized substances are protected.<\/span><\/p>\n<p style=\"line-height: 1.5em; margin-bottom: 10px;\"><span style=\"font-size: 16px;\">5. The drying process can remove 95%\uff5e99% of moisture, so that the product can be stored for a long time without deterioration.<\/span><\/p>\n<p style=\"margin-bottom: 10px; line-height: 1.5em;\"><span style=\"font-size: 16px;\">6. Because the material is in a frozen state and the temperature is very low, the temperature of the heat source for heating is not high, and the normal temperature or low temperature heater can meet the requirements.<\/span><\/p>\n<h2 style=\"line-height: 1.5em;\"><span style=\"font-size: 24px;\"><em><strong>Where to Get a Freeze Dryer\uff1f<\/strong><\/em><\/span><\/h2>\n<p style=\"margin-bottom: 10px; line-height: 1.5em;\"><span style=\"font-size: 16px;\">SED Pharma has rich experience in sales of best dryer machine for Labs (such as laboratory <\/span><a style=\"text-decoration: underline; font-size: 16px;\" href=\"https:\/\/dev.gseo.dev\/sedpharma\/product\/high-speed-centrifugal-spray-dryer-in-food-industry-sed-pg\/\" target=\"_blank\" rel=\"noopener\"><strong><span style=\"font-size: 16px;\">spray dryer<\/span><\/strong><\/a><span style=\"font-size: 16px;\">) or manufacturers in pharmaceutical, food, chemical industry. We also have our own factory that can provide you with complete after-sales service. Welcome to consult!<\/span><\/p>\n<p style=\"line-height: 1.5em; margin-bottom: 10px;\">\n","protected":false},"excerpt":{"rendered":"<p>The freeze dryer is based on vacuum freeze drying technology and is widely used in the fields of medicine, biological products, food blood products, and active substances. Fundamental of Freeze Dry System The basic principle of vacuum\u00a0freeze dry system is based on the three-state change of water. Water has solid, liquid and gaseous states, and [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":361,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[50],"tags":[],"class_list":["post-360","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-case-study"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v19.10 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>What is Freeze Dryer\uff1f - SED Pharma<\/title>\n<meta name=\"description\" content=\"The freeze dryer is based on vacuum freeze-drying technology and is used in medicine, biological products and active substances.\" \/>\n<meta name=\"robots\" content=\"noindex, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"What is Freeze Dryer\uff1f - 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