Weighing scales – Discharge from weigher to receiver
Patent
1992-09-14
1995-11-14
Wong, Peter S.
Weighing scales
Discharge from weigher to receiver
141 83, 222 55, G01G 1316
Patent
active
054668948
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention is directed to a method for supplying pre-defined bulk material weights in an exact manner in shipping packages, particularly in bags, as well as to an automatic filling apparatus.
Background Art
Aside from classic shipping packages, specialized filling and packing arrangements for consumer packaging are known in the area of the so-called packing industry. As a rule, filling quantities of several hundred grams, at most several kilograms, are supplied. In general, 5-10 kg weights are felt to be the upper limit. The size is adapted for easy handling for sale and for the consumer and from the retail store to the final consumer, e.g. in the kitchen. Shipping packages serve primarily for transporting from one processing plant to the next, in the classic case from the mill to the baker. The weight of shipping packages, which is usually suited to male workers, is between 20 and 100 kg.
In practice, three stages of automation developed for filling shipping bags correspond to the specific requirements: automatic closing of bags closing of bags
This shows that the preparation of portions is the basis in every case for all stages of automation. The core problem consists in forming and precisely weighing bulk good portions within a short span of time. One and the same bulk material can behave differently: the goods may be mixed with air when transported and behave more or less like liquid, or extreme conditions, such as heat or cold, of the machine elements and the resulting adhesion between the bulk material and wall parts may also be troublesome.
The contents of the bag represent small portions in comparison to the dimensions of storage silo installations. Nevertheless, filling equipment of intermediate depots, for example, have large dimensions. Assuming room heights of 3 to 4 m, the packing devices take up one to two floors.
After the bulk weigher, a weigher discharge hopper is usually used so that the entire contents of the weigher are collected in an intermediate buffer prior to packing, which likewise requires height.
Counter to the practice of the past two decades of replacing the bag by tank and large-container transportation, there is now a reverse trend toward small shipping packages, i.e. the bag. In many countries, professional associations demand a reduction in bag weight, e.g. of 50 to 25 kg, which means a doubling of the quantity of bags with the same output tonnage. For this reason there is an increasing demand for packing stations with a very high unit output capacity. So-called valve bags are most widely used for especially fine industrial products like cement, lime, plastics, etc. The bag is filled with product via a beak-like filling neck or sleeve through a correspondingly small valve opening of the bag. After the desired weight is reached, the bag opening can be closed immediately by means of prepared paper folds.
The enormous advantage consists in that the product is only very seldom mixed with air. The chief disadvantage of this system consists in its limited use. Grains, semolina, flour, bran, and feedstuff, etc. have sharply differing bulk weights as is well known, so that with different products the same bag size can be filled with different weights.
In classic flour bags, on the other hand, a small amount of empty space in the filled, closed paper or plastic bag is not troublesome since this bag is tightly closed after filling, either by a sewing machine or by means of glue.
The bag is suitable for simple shipping of unit goods over long distances and is a convenient unit for optimal "handling" in the plant in many respects. Depending on the specific product, particular criteria, such as questions of hygiene, dust-free, tight bag filling, are important. In almost all cases, the buyer demands precise filling weight of each individual bag. However, filling a large number of individual bags per hour by exact weight can only be accomplished cheaply by a high degree of automation. Generally, certain methodical rules must be observed by lawmakers in the so-calle
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Buehler AG
Gibson Randy W.
Wong Peter S.
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