GB2141685A - Bag-forming machine - Google Patents
Bag-forming machine Download PDFInfo
- Publication number
- GB2141685A GB2141685A GB08309934A GB8309934A GB2141685A GB 2141685 A GB2141685 A GB 2141685A GB 08309934 A GB08309934 A GB 08309934A GB 8309934 A GB8309934 A GB 8309934A GB 2141685 A GB2141685 A GB 2141685A
- Authority
- GB
- United Kingdom
- Prior art keywords
- spreaders
- tube
- bag
- forming
- machine
- 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.)
- Withdrawn
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
- B65B9/00—Enclosing successive articles, or quantities of material, e.g. liquids or semiliquids, in flat, folded, or tubular webs of flexible sheet material; Subdividing filled flexible tubes to form packages
- B65B9/10—Enclosing successive articles, or quantities of material, in preformed tubular webs, or in webs formed into tubes around filling nozzles, e.g. extruded tubular webs
- B65B9/13—Enclosing successive articles, or quantities of material, in preformed tubular webs, or in webs formed into tubes around filling nozzles, e.g. extruded tubular webs the preformed tubular webs being supplied in a flattened state
- B65B9/14—Devices for distending tubes supplied in the flattened state
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Containers And Plastic Fillers For Packaging (AREA)
Abstract
In a bag-forming machine, a flexible tube (12) is advanced and transversely sealed by bars (11). Spreaders (4) are used to engage opposite inner surfaces of the tube (12) and spread and flatten the tube (12) prior to sealing, thus avoiding puckers. The bag can be filled while the spreaders (4) are still within the bag. In order to avoid difficulties caused by friction between the tube (12) and the spreaders (4), and also to allow the bag to assume a more roundish shape for filling, the spreaders (4) are retractable and openable pneumatically, the stroke of the pneumatic ram being limited so that when open, the spreaders (4) assume a fixed, predetermined position. The retraction and opening of the spreaders (4) is cyclical, the spreaders (4) being retracted while the tube (12) is advanced and being open while the tube (12) is stationary. <IMAGE>
Description
SPECIFICATION
Bag-forming machine
In GB 2065599A, there is described an automatic or part-automatic bag-forming machine, which has spreaders for avoiding puckers or wrinkles in the tube prior to forming a transverse seam. There are also grippers which grip the sides of the tube and move aprart transversely. In this way, a liquid-tight container can be provided.
It has now been found better to use spreaders which can be retracted cyclically, and/or spreaders which have a fixed position when they are operative. The spreaders can be used with or without'the grippers.
The spreaders can open automatically to a fixed, pre-determined position, and can be retained in this position until the transverse seam has been formed, being retracted as soon as practicable after forming the transverse seam. By having a fixed position, the width is precisely determined in such a way that the tube will be perfectly flat. By retracting the spreaders, there is less friction when advancing the film to form the next bag or container, and also the bag or container can assume a more roundish shape for filling.
The fixed position of the spreaders can be adjustable, according to the container width or possibly factors such as the elasticity of the film.
Preferably, the spreaders are close above the means for forming the transverse seam and the grippers, if present, are close below such means.
The spreaders are preferably pressure-fluid actuated, pneumatic action being most preferred.
An embodiment of the invention is illustrated in the accompanying drawing. The machine can be a known bag-forming machine, for instance as in GB 2065599A. So as to be within the tube of film, there is a circularsection forming tube 1 which carries two slotted brackets 2 and a slide bracket 3.
Diametrically opposed spreaders 4 are pivoted to the brackets 2 and are connected by pivoted links 5 to a head 6. The head 6 is mounted on the end of a rod 7, guided by a guide sleeve 8 held by the bracket 3 and connected to a double-acting, adjustablestroke pneumatic ram 9. The ram 9 is mounted on the top-most plate 10 of the machine. It will be seen that retraction of the rod 7 retracts the spreaders 4, and extension of the rod 7 extends the spreaders 4 to a predetermined fixed position.
A standard arrangement can be used for forming a transverse seam, including a clamp bar 11. The top of the clamp bar 11 will be just below the retracted position of the spreaders 4. The side of the spread tube is indicated at 12.
1. A bag-making machine, comprising:
means for feeding a flexible tube which will provide the wall of a bag;
spreaders which will be positioned within the tube, for engaging opposite inner surfaces of the tube and spreading and flattening the tube, the spreaders assuming a fixed, predetermined position when operative, but being retractable;
means for actuating the spreaders so that they are retracted as the feed means feeds the tube, and are then opened into said fixed position; and
means adjacent the spreaders for forming a transverse seam across the tube, to close the tube.
2. A bag-making machine, for making containers out of flexible material, comprising:
diametricaily-opposed spreaders;
feed means for feeding a tube of flexible material over the spreaders so that the spreaders form the tube into a pucker-free shape of elongate cross-section;
means for actuating the spreaders so that they are retracted as the feed means feeds the tube, and are then opened up into a fixed, predetermined position in which they spread and flatten the tu be; and
sealing means downstream of the spreaders, for sealing the sides of the tube to each other along a transverse zone.
3. The machine of Claim 1 or Claim 2, wherein grippers are provided downstream of the seal-forming or ceiling means for gripping the outer surfaces of the edges of the flat tube and tensioning the tube transversely by relative transverse movement between the grippers.
4. The machine of any of the preceding
Claims, wherein the spreaders are pneumatically actuated.
5. A bag-making machine, wherein the spreaders are substantially as herein described with reference to, and as shown in, the accompanying drawings.
6. A method of making a flexible liquid tight container in a bag-making machine, the method comprising:
making a tube of flexible material;
passing the tube over diametrically-opposite spreaders while the spreaders are retracted;
when the tube is stationary, actuating the spreaders to open them into a fixed, predetermined position in which they engage opposite inner surfaces of the tube and spread and flatten the tube to form a pucker-free shape of elongate cross-section; and
sealing the sides of the tube to each other along a transverse zone.
7. The method of Claim 6, wherein the spreaders are close upstream of the means for sealing the sides of the tube to each other, and grippers are provided downstream of the
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (8)
1. A bag-making machine, comprising:
means for feeding a flexible tube which will provide the wall of a bag;
spreaders which will be positioned within the tube, for engaging opposite inner surfaces of the tube and spreading and flattening the tube, the spreaders assuming a fixed, predetermined position when operative, but being retractable;
means for actuating the spreaders so that they are retracted as the feed means feeds the tube, and are then opened into said fixed position; and
means adjacent the spreaders for forming a transverse seam across the tube, to close the tube.
2. A bag-making machine, for making containers out of flexible material, comprising:
diametricaily-opposed spreaders;
feed means for feeding a tube of flexible material over the spreaders so that the spreaders form the tube into a pucker-free shape of elongate cross-section;
means for actuating the spreaders so that they are retracted as the feed means feeds the tube, and are then opened up into a fixed, predetermined position in which they spread and flatten the tu be; and
sealing means downstream of the spreaders, for sealing the sides of the tube to each other along a transverse zone.
3. The machine of Claim 1 or Claim 2, wherein grippers are provided downstream of the seal-forming or ceiling means for gripping the outer surfaces of the edges of the flat tube and tensioning the tube transversely by relative transverse movement between the grippers.
4. The machine of any of the preceding
Claims, wherein the spreaders are pneumatically actuated.
5. A bag-making machine, wherein the spreaders are substantially as herein described with reference to, and as shown in, the accompanying drawings.
6. A method of making a flexible liquid tight container in a bag-making machine, the method comprising:
making a tube of flexible material;
passing the tube over diametrically-opposite spreaders while the spreaders are retracted;
when the tube is stationary, actuating the spreaders to open them into a fixed, predetermined position in which they engage opposite inner surfaces of the tube and spread and flatten the tube to form a pucker-free shape of elongate cross-section; and
sealing the sides of the tube to each other along a transverse zone.
7. The method of Claim 6, wherein the spreaders are close upstream of the means for sealing the sides of the tube to each other, and grippers are provided downstream of the sealing means, gripping the outer surfaces of the edges of the flat tube and tensioning the tube transversely by relative transverse movement between the grippers.
8. A method of making a flexible liquidtight container in a bag-making machine, substantially as herein described with reference to the accompanying drawings.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB08309934A GB2141685A (en) | 1983-04-13 | 1983-04-13 | Bag-forming machine |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB08309934A GB2141685A (en) | 1983-04-13 | 1983-04-13 | Bag-forming machine |
Publications (2)
Publication Number | Publication Date |
---|---|
GB8309934D0 GB8309934D0 (en) | 1983-05-18 |
GB2141685A true GB2141685A (en) | 1985-01-03 |
Family
ID=10541007
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB08309934A Withdrawn GB2141685A (en) | 1983-04-13 | 1983-04-13 | Bag-forming machine |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB2141685A (en) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1372778A (en) * | 1971-09-01 | 1974-11-06 | Sig Schweiz Industrieges | Apparatus for the manufacture of bags |
GB1486486A (en) * | 1974-02-13 | 1977-09-21 | Sig Schweiz Industrieges | Manufacture of bags |
GB2065599A (en) * | 1979-12-20 | 1981-07-01 | Rowell F J | Liquid packaging system |
-
1983
- 1983-04-13 GB GB08309934A patent/GB2141685A/en not_active Withdrawn
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1372778A (en) * | 1971-09-01 | 1974-11-06 | Sig Schweiz Industrieges | Apparatus for the manufacture of bags |
GB1486486A (en) * | 1974-02-13 | 1977-09-21 | Sig Schweiz Industrieges | Manufacture of bags |
GB2065599A (en) * | 1979-12-20 | 1981-07-01 | Rowell F J | Liquid packaging system |
Also Published As
Publication number | Publication date |
---|---|
GB8309934D0 (en) | 1983-05-18 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |