GB2083438A - Calibrating bag - Google Patents
Calibrating bag Download PDFInfo
- Publication number
- GB2083438A GB2083438A GB8029121A GB8029121A GB2083438A GB 2083438 A GB2083438 A GB 2083438A GB 8029121 A GB8029121 A GB 8029121A GB 8029121 A GB8029121 A GB 8029121A GB 2083438 A GB2083438 A GB 2083438A
- Authority
- GB
- United Kingdom
- Prior art keywords
- bag
- calibration
- film
- tube
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F19/00—Calibrated capacity measures for fluids or fluent solid material, e.g. measuring cups
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B70/00—Making flexible containers, e.g. envelopes or bags
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01C—PLANTING; SOWING; FERTILISING
- A01C7/00—Sowing
- A01C7/08—Broadcast seeders; Seeders depositing seeds in rows
- A01C7/10—Devices for adjusting the seed-box ; Regulation of machines for depositing quantities at intervals
- A01C7/107—Calibration of the seed rate
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01M—CATCHING, TRAPPING OR SCARING OF ANIMALS; APPARATUS FOR THE DESTRUCTION OF NOXIOUS ANIMALS OR NOXIOUS PLANTS
- A01M7/00—Special adaptations or arrangements of liquid-spraying apparatus for purposes covered by this subclass
- A01M7/0089—Regulating or controlling systems
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B2155/00—Flexible containers made from webs
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B2155/00—Flexible containers made from webs
- B31B2155/002—Flexible containers made from webs by joining superimposed webs, e.g. with separate bottom webs
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B2160/00—Shape of flexible containers
- B31B2160/10—Shape of flexible containers rectangular and flat, i.e. without structural provision for thickness of contents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B70/00—Making flexible containers, e.g. envelopes or bags
- B31B70/74—Auxiliary operations
- B31B70/81—Forming or attaching accessories, e.g. opening devices, closures or tear strings
- B31B70/813—Applying closures
- B31B70/8134—Applying strings; Making string-closed bags
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Soil Sciences (AREA)
- Environmental Sciences (AREA)
- Pest Control & Pesticides (AREA)
- Wood Science & Technology (AREA)
- Zoology (AREA)
- Insects & Arthropods (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Bag Frames (AREA)
- Making Paper Articles (AREA)
Abstract
A calibration bag for an outlet of, for example, an agricultural machine is made by superposing two layers of translucent or transparent thermoplastics material and welding them together by a weld line (19) to define a pocket (20) open at one end, applying at least one calibration mark (21) accurately in register with the weld line (19), and preferably providing attachment means (17) at or adjacent the open end enabling the bag to be attached to a dispensing outlet. <IMAGE>
Description
SPECIFICATION
Calibrating bag
This invention relates to a calibrating bag for use with an agricultural machine for dispensing fertilizer and other crop or ground treating agents.
Such substances are usually dispensed in powder or granule form from an appliance including a plurality of outlets, such as discharge nozzles, connected to a hopper. The- rate of dispensing is quite critical, as it determines the dosage per unit area. Clearly, under-dosing may result ih, low crop yield or only partial eradication of pests and/or weeds, and over-dosing may result in waste or poisioning of the ground. Whilst each of the outlets can be adjusted to vary the flow therethrough, they are not'calibrated and it is usual to calibrate them by attaching a tubular calibration bag to each outlet and then operating the appliance over a specific distance as though in use, for example 100 metres.The amount agent dispensed from each outlet can be checked against a predetermined desired amount and the outlets adjusted and the procedure repeated if necessary until all the nozzles are dispensing the correct amount of agent.
Heretofore, such calibration bags have been in the form of an extruded tube of plastics material printed with directions and calibration lines, sealed at one end and provided with a tunnel hem and drawstring at the other, for attachment to an outlet of the appliance.
It has been found, however, that bags of this' sort are very far from accurate and errors up to 20% in the amount agent measured have occurred. This is due to several factors. Firstly, the width qf the tube, and hence the diameter when filled, can vary widely in manufacture, variations of up to 10% are nqt uncommon. Secondly, the position of the cut-off and seal at the base of the bag varies and this can cause errors around 5%.
Thirdly, the printing of the calibration lines and directions-is often out of register with the lengths of tube as produced and this can again give errors of about 5%. Of course, sometimes these errors cancel out, but the nature of the manufacturing process is such that it is impossible to know the degree of error without testing each bag; which is clearly uneconomic when very large numbers of such bags, which are a disposable item, are involved.
It is an object of the present invention, therefore, to provide a calibration bag which does not have the aforesaid disadvantages of extruded and printed tubular bags, but which can still be produced cheaply and simply.
Accordingly the invention provides a method of making a calibration bag comprising forming a tube, closed at one end, from thermoplastics film and, with the tube flattened, welding together the two layers of film to define, within the area of the flattened tube a pocket open at one end, and applying one or more calibration marks to the tube at a fixed location or fixed locations relative to the outline of the pocket.
Preferably the calibration mark(s) and the welding are carried out simultaneously. The calibration mark(s) can be applied by lines of welding outside the pocket or by hot metal foil blocking.
The welding and/or application of calibration mark(s) can be effected before or after the bag is severed from the bag-making stock. The bag can be printed conventionally with directions and explanations of the calibrati6n mark(s).
The bag can have a tunnel hem and drawstring at its open end.
Preferably the pocket tapers from the open end towards the closed end.
The bag can be extruded with the direction of extrusion coincident with the length of the bag.
Alternatively, to facilitate production of the tunnel hem, the bag can be formed by forming tunnel hems along the opposite edges of a web of fi!m, folding the web so that the edges lie together and cutting the folded web transversely of its length. The cut edges can be simultaneously welded together.
The invention also provides a calibration bag comprising a pair of superposed films of thermoplastics material having been welded together to define a pocket open at one end and one or more calibration marks having been applied thereto in register with the pocket.
The film is at ieast partially translucent or transparent to allow the end of material placed in the bag to be readily ascertainable.
Preferably the film is transparent polyester or polyethylene.
The invention will be described, further, by way of example, with reference to the accompanying drawings, wherein: Fig. 1 is a perspective view of a known calibration bag; and
Fig. 2 is an elevation of a bag conforming to the present invention.
The conventional bag 10 isa tube extruded longitudinally and sealed at its base 11 and printed with directions at 12 and calibration marks at 13. A tunnel hem 14 is provided at the upper, open end and has a drawstring 1 5. When material is placed in the bag the bag will assume a generally circular-sectional configuration and the end of the material in relation to the calibration marks should enable the amount of material in the bag to be determined. Unfortunately, inaccuracies in the width of the bag due to the extrusion variations, variations in the position of the weld at base 11 and variations in the register of the printed material make this bag potentially very inaccurate.
Illustrated in Figure 2 is a preferred bag 1 6 conforming to the invention. The bag 1 6 comprises a pair of superposed films of transparent polyethylene. The pair of films can be formed by extruding in the longitudinal direction of the bag and flattening the tube so formed.
Aiternaitvely, and to facilitate production of a tunnel hem 17 at the open end, a web of film can have tunnel hems formed along its edges and then be folded and the two superposed films so formed cut transversely and sealed along edges 1 8.
Each bag 1 6 has its two films welded together by a generally V-shaped line of welding 19 which defines a pocket 20. The size of the pocket 20 is independent on the sizes of the films as cut or of the tube as extruded. Simultaneously with the welding, calibration marks 21 are applied by hot foil blocking. Thus the calibration marks are in exact desired register with the pocket 20 and give an accurate measure of material placed into the bag 16.
Instructions 22 and calibration explanation material 23 can be applied by conventional printing. It does not matter if this material is not in exact register with the pocket 20 or calibration marks 21. The fact that the pocket 20 is tapered gives a greater sensitivity in relation to small amounts of material.
The invention is not limited to the details of the foregoing and variations may be made thereto.
Claims (15)
1. A method of making a calibration bag comprising superposing two layers of transparent or translucent thermoplastics film, welding the two layers together to define a pocket open at one end, applying one or more calibration marks at a fixed location or fixed locations relative to the pocket and providing attachment means at or adjacent the open end of the pocket to permit attachment of the bag to a dispensing outlet.
2. A method of making a calibration bag comprising forming a tube, closed at one end, from thermoplastics film and, with the tube flattened, welding together the two layers of film to define, within the area of the flattened tube a pocket open at one end, and applying one or more calibration marks to the tube at a fixed location or fixed locations relative to the outline of the pocket.
3. A method as claimed in claim 1 or 2 wherein the welding and the appplication of the calibration
mark(s) are effected simultaneously.
4. A method as claimed in claim 1, 2 or 3, wherein the or each calibration mark is applied by a line or lines of welding.
5. A method as claimed in claim 1, 2 or 3, wherein the or each calibration mark is applied by 'hot foil blocking.
6. A method as claimed in any preceding claim
including the further step of printing on the bag
directions as to use, and/or explanation of the
calibration mark(s) or the like.
7. A method as claimed in claim 1 or any claim
appendant thereto, wherein the attachment
means comprises a tunnel hem and drawstring.
8. A method as claimed in claim 1 or any claim
appendant thereto, wherein the attachment
means comprises a tunnel hem and an elastic
band.
9. A method as claimed in any preceding claim
wherein the tunnel formed tapers to be narrower
at its closed end than at its open end.
10. A method as claimed in claim 9 wherein the
pocket is defined by a generally V-shaped weld
line.
11. A method as claimed in any preceding
claim wherein the two layers of plastics film are
portions of an extruded tube of such material.
12. A method as claimed in claim 7, wherein tunnel hems are first formed along two opposite
edges of a web of film and the web is folded so that such edges lie together and the web is cut transversely of its length.
1 3. A method as claimed in claim 12, wherein the cut edges of the film are welded together.
14. A method of making a calibration bag
substantially as hereinbefore described with
reference to and as illustrated in Fig. 2 of the
accompanying drawings.
15. A calibration bag made by the method of
any preceding claim.
1 6. A calibration bag substantially as
hereinbefore described with reference to and as
illustrated in Fig. 2 of the accompanying drawings.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB8029121A GB2083438B (en) | 1980-09-09 | 1980-09-09 | Calibrating bag |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB8029121A GB2083438B (en) | 1980-09-09 | 1980-09-09 | Calibrating bag |
Publications (2)
Publication Number | Publication Date |
---|---|
GB2083438A true GB2083438A (en) | 1982-03-24 |
GB2083438B GB2083438B (en) | 1984-03-07 |
Family
ID=10515966
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB8029121A Expired GB2083438B (en) | 1980-09-09 | 1980-09-09 | Calibrating bag |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB2083438B (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0297803A1 (en) * | 1987-06-29 | 1989-01-04 | Nomix-Chipman Limited | Calibration of fluid delivery equipment |
US4925096A (en) * | 1987-12-31 | 1990-05-15 | Nomix Manufacturing Company Limited | Apparatus for delivering a liquid |
US5131591A (en) * | 1988-09-05 | 1992-07-21 | Nomix Manufacturing Company | Device for measuring flow |
CN111034698A (en) * | 2019-12-17 | 2020-04-21 | 台州市斯佩雷尔植保机械有限公司 | Knapsack sprayer |
-
1980
- 1980-09-09 GB GB8029121A patent/GB2083438B/en not_active Expired
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0297803A1 (en) * | 1987-06-29 | 1989-01-04 | Nomix-Chipman Limited | Calibration of fluid delivery equipment |
US4889001A (en) * | 1987-06-29 | 1989-12-26 | Nomix Manufacturing Company Ltd. | Calibration of fluid delivery equipment |
AU616415B2 (en) * | 1987-06-29 | 1991-10-31 | Nomix Manufacturing Company Limited | Calibration of fluid delivery equipment |
US4925096A (en) * | 1987-12-31 | 1990-05-15 | Nomix Manufacturing Company Limited | Apparatus for delivering a liquid |
US5131591A (en) * | 1988-09-05 | 1992-07-21 | Nomix Manufacturing Company | Device for measuring flow |
CN111034698A (en) * | 2019-12-17 | 2020-04-21 | 台州市斯佩雷尔植保机械有限公司 | Knapsack sprayer |
CN111034698B (en) * | 2019-12-17 | 2021-07-16 | 台州市斯佩雷尔植保机械有限公司 | Knapsack sprayer |
Also Published As
Publication number | Publication date |
---|---|
GB2083438B (en) | 1984-03-07 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PG | Patent granted |