Hangzhou Shengde Machinery Co., Ltd
shu@sedpharma.com
15336513721
Room 602, 6th Floor, Building 1, No. 2630 Yuhangtang Road (Jingcheng Electric Power Technology Park), Yuhang District, Hangzhou City
On the pharmaceutical packaging line, filling, capping, rolling, capping, and labeling are the core processes. Among them, capping is a key step in ensuring the sealing of liquid and solid bottled drugs. As the core equipment for achieving this function, the selection of the capping machine (also known as the screw capping machine or screw capping machine) directly affects production efficiency, cost control, and product quality. This article will comprehensively introduce the working principle and main types of capping machines in the most direct way, and provide you with a practical selection guide.
The working principle of the capping machine is clever and efficient, and its core process can be decomposed into four steps:
Bottle entry and positioning:The bottles that have been filled and capped are fed into the capping machine through a conveyor belt. By using a screw or star wheel bottle separation device, the bottles are precisely separated into the required spacing.
Bottle body clamping:After the bottle enters the capping station, the V-shaped clamping blocks or belts on both sides will firmly clamp the bottle body (or bottle shoulder), ensuring that the bottle will not rotate or move during the capping process, providing a stable foundation for capping.
Rub and tighten the lid:This is the most crucial step. A pair of high-speed reverse rotating rubbing wheels (usually made of wear-resistant polyurethane or silicone) move from both sides to the center, contacting and pressing the side wall (skirt) of the bottle cap. By relying on friction to drive the bottle cap to rotate, it is tightened onto the thread of the bottle mouth.
Torque control and bottle discharge:When the tightening torque reaches the preset value (controlled by a mechanical clutch or servo motor system), the rubbing wheel stops applying force or automatically disengages. The tightened bottle is released and transported by a conveyor belt to the next process (such as a labeling machine).
Features:Throughout the process, the rubbing wheel only contacts the side wall of the bottle cap and does not touch the top, so it will not damage the appearance of the top of the bottle cap, making it particularly suitable for bottle caps with printing and anti-counterfeiting structures.
Classified by degree of automation:
Semi automatic capping machine:Manual bottle placement and retrieval are required, with low automation and slow speed. Suitable for laboratory research and development, small batch production, or intermediate product trial production.
Fully automatic online capping machine:Integrated into the automated packaging production line, it automatically completes the entire process of bottle feeding, capping, and discharging, with high speed and stable efficiency. It is the mainstream choice for large-scale pharmaceutical production.
Classified by screw cap method (this is the key classification):
Rubbing wheel capping machine:The most common type is to use a pair of rubbing wheels for work. Compact structure and wide application.
Rubbing tape capping machine:Using a parallel wear-resistant belt instead of a rubbing wheel, the contact surface for wrapping the bottle cap is larger and the force transmission is softer. It is suitable for irregular bottles or particularly tall bottle caps, but the structure is relatively complex.
Divided by driving control mode:
Mechanical torque type:Controlling torque through mechanical spring clutch has lower cost, but relatively poor accuracy and long-term stability.
Servo torque type:Adopting servo motor drive and control, with high torque accuracy, programmable control of screw cap speed curve, and data recording function. It is a standard configuration of modern capping machines.
When choosing a capping machine, please verify the following key indicators and communicate fully with the supplier. We takeSED-CG three wheel capping machineUsing some publicly available parameters as an example, explain how to interpret these indicators:
| Selection dimension | Key issues and parameters | Explanation and Example Reference |
|---|---|---|
| 1. Production speed | How many bottles/minute are needed? | SED-CG has a nominal speed of 10-100 bottles per minuteThis is a wide range, and the actual speed needs to match the bottle and lid types. When selecting, it is necessary to test the actual bottle sample as the standard. |
| 2. Compatibility | What is the material, type, diameter, and height range of the bottle cap? | This is the most important indicator. SED-CG clearly indicates that it is suitable for plastic covers such as ordinary covers, protective ring covers, double-layer covers, flip covers, etcYou must provide all bottle cap samples that need to be processed for testing. |
| 3. Torque requirements | What is the torque range required by the process? How high control accuracy and repeatability are required? | The torque control range of the equipment must cover your requirements. SED-CG uses a frequency converter to control the speed of the screw cap motor, which is the basis for achieving torque control. For higher precision requirements, specific configurations need to be confirmed. |
| 4. Control and Data | Is the user interface user-friendly? Do you need data recording? | SED-CG is equipped with a touch screen that supports both Chinese and English interfaces, and can display speed, output, and alarm informationIf strict torque recording is required for each bottle, it is necessary to confirm whether a servo control system is equipped. |
| 5. Compliance and Cleanliness | Is the equipment made of 304/316L stainless steel? Is cleaning convenient? | The SED-CG machine shell is made of high-quality stainless steel plate, and the material contact part is polished with high precisionThe main transmission is built-in, and these designs are conducive to cleaning. Need to inspect on-site for any hygiene blind spots. |
| 6. Connection and Integration | Does the height and width of the equipment inlet and outlet match my line? | The size of SED-CG equipment is 2280 * 1080 * 1940mmYou need to check if this size can fit into your existing production line layout and confirm if the import and export heights match. |
| 7. Core configuration | What are the brands and grades of key electrical components? | SED-CG mentioned brands such as Delta (control system, frequency converter), Sike (photoelectric eye), Schneider (switch), etc. in the electrical configurationThis can serve as a reference for evaluating the overall grade and reliability of the equipment. |
| 8. Supplier support | Can you provideFree bottle sample testing？ | This is a mandatory option!No matter how attractive the device parameters are, it must be tested with your actual bottle cap and bottle to verify its capping ability, capping success rate, and torque stability. |
Core recommendation:
Do not make decisions solely based on product samples and prices.Be sure to bring the bottles and caps you actually use to the supplier or watch a remote videoField testingObserve the stability of the operation process, listen to the noise level, and most importantlyCheck the uniformity of torque after rotating the cap(Randomly select 10-20 bottles using a torque meter).
Conclusion
Choosing a suitable capping machine is a highly technical investment. By thoroughly understanding its working principle, clarifying your own production needs, and strictly following the above guidelines for inspection and verification, you will definitely be able to equip your production line with a reliable capping machine.During the evaluation process, equipment such as the SED-CG three wheel capping machine that provides clear technical parameters, compatibility range, and core component brands can provide you with a clear and measurable reference benchmarkHelp you make wiser decisions.
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