干法制粒机时利用物料本身的结晶水，依靠机械挤压原理，直接对原料粉末不加粘合剂及水进行压片成型—>压片成型—>片状物粗碎—>造粒成型为一体的制粒设备。制成不规则状颗粒，完成从粉体至颗粒的物理变化过程。干法制粒机具有工艺简单、生产批量大、易于清洁维护等特点。广泛用于医药、食品、化工等行业。
干法制粒机主要分为制粒装置和动力装置，两部分在空间上隔离。制粒装置又主要分为10个模块：1.水平喂料系统2.螺杆进料系统3.辊压系统，压辊4.预防系统5.破碎系统6.取样口7.两级筛分制粒系统8.取样口9.颗粒出口10.机架。
干法制粒过程中辊压过程，干粉状或微细晶体状原料被压辊挤压成薄片，并且薄片的质量决定了最终用的质量。干法制粒机使用了辊压
控制技术，该设备的控制设备能够调节不同物料以及同一物料不同批次之间的任何物理性质的波动（如局部的不均匀），使得干法制粒的工艺参数（如处理量、片状密度、辊压压力、速度等）能够被精确、重复地调整，从而高效地生产出高质量的颗粒。
此外，干法制粒机进料和辊压处理过程之间有明确的、模块化的分离，螺杆进料系统直接将粉末送至压辊，使得辊压过程中不会影响螺杆进料系统的初步压制过程。
干法制粒机主要表现在对不同物料的适应性好、结构紧凑、拆装和清洗速度、一次成型率高、成品颗粒的质量包括密度、硬度、溶解度、颜色存在较小差异、自动化程度高。
DG系列干法制粒机—设备特点
1.整机悬臂式设计，具有观察方便、便于清理的特点。将加工区与动力传动区隔离且外形整洁，拆装清洗简便，实现了从粉体到颗粒的洁净密闭式生产。
2.压片传动结构采用油封、硅胶压辊专用密封空气隔离（漏轴结构）密封，有效做到传动部分与工作部分的安全隔离，且拆装、保养、更换便捷。
3.采用双螺杆送料，在送料末端有真空脱气装置，供料均匀且密实，提高成片强度的均匀性及成品率。
水冷式压辊，进出口结构为内置式，试物料在挤压过程时不会升温，影响物料性能。
 4采用PLC触屏智能化控制，一键启动，一键停止，可靠性高，操作简单。压轮间隙可调，传感器有效监控油压间隙距离等参数
5可选配置压轮水冷却系统、除尘回收系统 、震动分筛功能
压轮分为网纹，直纹，光轮三种适应不同物料。
6系统结构设计合理，人机界面安全、可靠、快捷、工艺流程配比合理，生产运行可靠。整机全不锈钢制作，接触物料部分可为316材质，符合GMP和FDA要求。
In the dry granulator, the crystal water of the material itself is used, relying on the principle of mechanical extrusion, to directly compress the raw material powder without any binder and water—>tabletting and molding—>coarse flakes—>granulation and molding As an integrated granulating equipment. It is made into irregular particles to complete the physical change process from powder to particle. Dry granulator has the characteristics of simple process, large production batch, easy to clean and maintain. It is widely used in medicine, food, chemical and other industries.
The dry granulator is mainly divided into a granulating device and a power device, and the two parts are completely separated in space. The granulating device is mainly divided into 10 modules: 1. Horizontal feeding system 2. Screw feeding system 3. Rolling system, pressure roller 4. Prevention system 5. Crushing system 6. Sampling port 7. Two-stage screening system Granule system 8. Sampling port 9. Granule outlet 10. Rack.
During the rolling process of dry granulation, the dry powder or fine crystalline raw material is squeezed into flakes by the pressing roller, and the quality of the flakes determines the quality of the final use. The dry granulator uses the latest roll press
Control technology, the control equipment of this equipment can adjust any physical property fluctuations (such as local unevenness) between different materials and different batches of the same material, so that the process parameters of dry granulation (such as throughput, flake density, Rolling pressure, speed, etc.) can be accurately and repeatedly adjusted to efficiently produce 
high-quality pellets.
In addition, there is a clear and modular separation between the feed of the dry granulator and the rolling process. The screw feeding system directly sends the powder to the pressing roller, so that the initial process of the screw feeding system will not be affected during the rolling process. Suppressing process.
Dry granulator is mainly manifested in its good adaptability to different materials, compact structure, high speed of disassembly and cleaning, high one-time molding rate, small differences in the quality of finished particles including density, hardness, solubility, color, and high degree of automation.
DG series dry granulator—equipment features
1. The cantilever design of the whole machine has the characteristics of convenient observation and easy cleaning. The processing area is completely isolated from the power transmission area and the appearance is neat, easy to disassemble and clean, and realize the clean and closed production from powder to granule.
2. The sheet-pressing transmission structure adopts oil seal and silicone pressure roller special sealing air isolation (leakage shaft structure) to effectively isolate the transmission part and the working part, and it is convenient to disassemble, maintain and replace.
3. It adopts twin-screw feeding and a vacuum degassing device at the end of the feeding. The feeding is uniform and dense, which improves the uniformity of the strength of the sheet and the yield.
The water-cooled pressure roller has a built-in inlet and outlet structure, and the test material will not heat up during the extrusion process, which will affect the material performance.
 4It adopts PLC touch screen intelligent control, one key to start, one key to stop, high reliability and simple operation. The pressure roller gap is adjustable, and the sensor effectively monitors the oil pressure gap distance and other parameters
5 Optional roller water cooling system, dust removal and recovery system, vibration screening function
The pressure wheel is divided into three types: net grain, straight grain and smooth wheel to adapt to different materials.
6 The system structure design is reasonable, the man-machine interface is safe, reliable, and fast, the process flow ratio is reasonable, and the production operation is reliable. The whole machine is made of stainless steel, and the contact material part can be made of 316 material, which meets GMP and FDA requirements