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The content is the object of packaging. Whether the measurement and supply of the automatic packaging machine is timely and accurate will directly affect the quality of the packaging product. It is the same as the quality of the content itself. It is related to the reputation of the manufacturer and the interests of consumers. Trade also affects the reputation of a country and the image of a nation. Correct, fast, simple and economical are the basic requirements for the metering and supply of contents.
The contents are various, with different types and forms, different physical and chemical properties, different prices, different packaging methods and specifications, and different requirements for measurement accuracy. Even for the same kind of products, different specifications will be used for packaging due to sales needs. Therefore, the metering process is quite complicated. Measurement supply-generally divided into three categories: weight, capacity, and counting. For example, the weight (grams) of packaged milk powder, the volume (mls) of packaged oral liquids, and the quantity (counts) of cigarettes.
At present, the capacity measurement and supply mostly use measuring cups, screw volume meters, metering pumps and other mechanical methods, which are introduced in books on automatic packaging machinery. Some small items, such as wood screws, thumbtacks, paper clips, etc., are marked on the packaging box, but they often use the method of measuring-determining the weight to change the counting supply to the weight supply. Weighing supply has a wide range of applications and high accuracy. The principle and method of automatic control of weighing supply and counting supply will be introduced below.
Full-automatic packaging machine weight supply is a method of using a weighing scale to weigh the contents (commonly known as "weighing") to achieve quantitative supply. In full-automatic packaging machines, it is often used to quantify the packaging of loose items such as powder, fine particles and irregular small pieces. The accuracy of the weight supply mainly depends on the weighing device itself, and has nothing to do with the change of the bulk density of the weighed items (under the condition of constant humidity), so it can accurately measure all kinds of bulk goods with unstable bulk density.
Weighing scales can be manufactured very accurately with a measuring accuracy of 0.1%. In particular, various electronic scales are small in size, light in weight, simple in structure, fast in response to sensors, easy to connect with a computer, and easy to automate the packaging process. Weight supply includes three stages of feeding, weighing and discharging. The so-called automatic control of weight supply is to study what method is used. The three stages of material feeding, weighing and discharging are organically linked and coordinated with other actions of the packaging machine. The working mode according to weight supply can be divided into two types: intermittent and continuous.