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This paper aims to optimize the weighing control system and compensate weighing error for weighing control system of coal mine paste-filling weighing control system.

The process of the paste-filling weighing control system is analyzed and the mathematical model of the paste-filling material weight is established. Then, the back-propagation (BP) neural network is used to optimize the control system and compensate the weighing error.

Without the BP neural network, the weighing error of the paste-filling control system is more than 3 per cent, whereas after optimization with the BP neural network, the weighing error is less than 1 per cent. With the simulation results, it is seen that the weighing error of the paste-filling control system decreases and the accuracy of the weighing control system improves and optimizes.

The method can be further used to improve the control precision of the coal mine paste-filling system.

Strain gauge loadcells have been used for many years to measure the contents weight of tanks, hoppers and the many various specialist processing vessels found in industrial manufacturing processes. Many of these applications have been extremely successful, providing the user with accurate and repeatable measurements with which to monitor and control chemically reactive, sometimes complex, blending operations. The benefits of a non‐contact measurement which is a direct indication of weight are self evident and have brought a reduction in manufacturing costs and improvement of product quality to those companies which have correctly applied the technique.

Although more frequently alleged by the defence in food and drugs prosecutions than the circumstances probably justify, acts of sabotage by operatives in deliberately introducing foreign bodies—some of them intrinsically dangerous—into foods during processing and packaging are becoming more prevalent. The evidence for an allegation of deliberate malpractice is in most cases circumstantial, but when object or material is thoroughly extraneous to any part of the food processing, it can reasonably be inferred. For example, glass splinters in a bottle of milk or soft drink, are an inseparable hazard of automatic bottling, but glass in a can of corned beef or sausages, in the absence of structural alterations, window breakages, etc., could lead to the suspicion that it had been placed there. Similarly, a hairnet, when all female operatives had resisted successfully the wearing of this headgear, and a sewing needle in bread, apart from the stale confectionery joke of its being used with thread to drag jam through the doughnuts!

EVERYBODY connected with the design of aeroplanes appreciates the importance of weight and C. G. position, yet it seems to be the one subject about which very little has been published in this country.

The purpose of this paper is to review the most recent innovations in sensor technology for better quality in packaging. Checking for container seals, damaged product, contaminates as well as tracking product to meet government requirements.

In-depth interviews with both the exhibitors and integrators of sensors at the recent PackExpo show.

Sensor technology continues to address an ever increasing number of packaging applications including quality, safety, product tracking, correct labeling as well as counting, weighing and other more traditional applications.

Sensor technology advances with greater use of X-ray, magnetic detection and remote chemical monitoring that are addressing an ever increasing number of packaging applications including quality, safety as well as counting, weighing and other more traditional applications.

Customers will learn about the latest in X-ray, magnetic sensing and the application of vision, weighing and counting technologies for improved products as they pass through the packaging phase of production.

Production of cationic resin at International Paint's Ladywood plant in Birmingham is now being achieved with the use of Bofors' computer controlled electronic weighing system.

The purpose of this paper is to develop a capacitance vehicle weighing device. The key part of this device is the capacitance vehicle weighing sensor. This paper discusses the static and dynamic performance test of capacitance vehicle weighing sensor with emphasis, and provides theoretical analysis, in order to provide the tests and theoretical basis for the popularization and application of the vehicle weighing device.

The paper gives an introduction to the weighing sensor in respects of the structure design and measuring principles, with the emphasis on the static and dynamic performance of the testing processes. Then, the paper provides the corresponding testing processes and data with theoretical analysis.

This weighing sensor can be applied to static as well as dynamic tests thus the capacitance vehicle weighing device is practical and worthy of promotion and popularization.

The capacitance vehicle weighing device is characterized by its simple structure, simple measuring circuits, strong reliability in anti‐interference, small size and low cost. The static performance is of little repetitive error, and the use of software may efficiently solve the problems of non‐linearity and hysteresis. In dynamic measurement, the speed, acceleration and vibration of the vehicle produce little effect on the result, which can be neglected, thus being able to overcome the disadvantages of the traditional weighing method which is of low speed and great errors.

A portable weighing device that gives an instant check on the contents of industrial storage drums has been developed by A Cheshire company.

BEFORE discussing the machines and methods used, it is necessary to understand the fundamental laws which govern the testing of materials.