Weighing and filling method for puffed food packaging machine

The weighing and filling method of the puffed food packaging machine is used for the measurement of puffed food materials which are easy to absorb moisture, easy to agglomerate, uneven in particle size and unstable in bulk density. High precision, but things are slower,

The layout of the device is relatively large, and it is mostly used to fill powdery and small-grain foods.

Commonly used devices: lever scales, spring scales, hydraulic scales, electronic scales, etc.
1. Intermittent weighing filling machine
There are two kinds of net weight filling method and gross weight filling method.
A, net weight filling method
Filling process: The feeder 2 transports the material from the storage hopper 1 to the measuring hopper 3. When the material in the measuring hopper is estimated to reach the determined quality, the hopper 5 is pushed out and enters the packaging container.

The feed can be done with a rotary feeder, belt, auger or other means, and weighed with a rigid scale or electronic scale.
Features: Because the weighing result is not affected by the change of container tare, the weighing accuracy is very high, and it is widely used in free-flowing solid materials requiring high-precision metering.

It can also be used for foods that are not suitable for volumetric filling, such as puffed and fried foods.
B, gross weight filling method
Filling process: The feeder 2 transports the material from the storage hopper 1 to the hopper 3, enters the packaging container, and determines the scale below the container to measure. When the contents of the container are estimated to reach the determined quality, the conveyor output is determined.

Features: The gross weight weighing method does not have a measuring bucket. The packaging container is placed on the scale to be filled. When the quality is determined, the feeding is stopped, so the quality is called gross weight.

The measurement accuracy is greatly affected by the quality of the container, and the measurement accuracy is not high. However, since the food is directly dropped into the container without weighing the measuring bucket, the adhesion signs of the food material do not affect the measurement accuracy.

Therefore, in addition to being applicable to materials that can flow freely, it is also used for metering filling with positively viscous materials.
2. Continuous weighing device
Receiving the weighing of the electronic belt scale can fundamentally reduce the time difference between the signal sent by the lever scale and the timing of the supply shutdown, which leads to the measurement error of the material, and can greatly improve the metering speed.

It is necessary to comply with high-speed packaging machines.
Filling process: The material flows continuously through the weighing pan during the belt transport process. The material on the belt (measured distance) on the weighing pan has undergone a quality change due to changes in apparent density.

This change resolves the sensor into a power change, and compares it with a given value, and then drives the actuator through signal amplification to control the gate lift to adjust the thickness of the layer.
In order to achieve quantitative packaging, a constant velocity arrangement of the splitter turntable is arranged below the outflow end of the electronic belt scale material. Each part of the turntable intercepts a piece of material on the belt in a commensurate time

(ie intercepting equal quality materials) and then injecting into the packaging container. The belt speed can be controlled to control the filling amount.
The measuring speed of the electronic belt weigher is 20-200 packs per minute, the metering range is 50-100g per pack, the measuring accuracy is ±(1.0~1.5)%, and the compliance accuracy is ±0.5g.