METHOD AND TOOL FOR AN AIRTIGHT SEALING OF TWO FOILS

Abstract: For producing an airtight sealing of two foils (4, 5) a metal slide (3) is used that is open in the side, and a flexible tube (1), the cavity (2) of which is hermetically sealed, as the foils (4, 5) are led into the slide (3) with the tube (1) at the top, after which a pressure is put to the cavity (2) of the tube so that it will expand and thus press the foils (4, 5) against the inner walls of the slide and in this way secure a complete sealing between the parts. When the pressure is removed from the interior of the tube, the parts can be easily separated and the method can be repeated. For placing the foils (4, 5) and the tube (1) in the right way a tool can be used, which consists of rolls (6, 7, 8) so that the foils (4, 5) and the tube (1) are placed correctly in the slide (3) when the tool is taken across the slide (3) by means of the rolls (8, 6).

Description: METHOD AND TOOL FOR AN AIRTIGHT SEALING- ' OF TWO FOILS The invention relates to an airtight sealing of two foils and a tool, for practising this method. When sealing hags ' of .e.g. plastic foil it is diffi¬ cult,.-.when handling large sizes, to obtain a sealing by simple means, which can be re-opened and then sealed again if .desired without any damage to the foil. As such bags ' furthermore are rather expensive, there is a considerable • economic risk/connected to the use/of the hi ' therto known- sealing-methods. These methods may most often, consist of rolling the edge of the foils and keeping t e;.-material, by means of tape or the like.' When large foil bags which e.g. shallC' be used for storage of crops or the like are to be sealed, the sealing must take, place all the way round the bagj and secure an airtight connection of the underlaying foil and:.the top foil. This must take place in a.- . simple way without damage to the foils, and besides, the sealing must be able .to be re-opened if desired and sealed again, which is not pδssible by means of the hitherto known methods. Furthermore, the sealing must be completely airtight. It is the object of the invention to meet these shortcomings and to improve the sealing method, and this is obtained by means of a method according to the invention, where the sealing area of the two foils is placed into a hollow slide through a longi¬ tudinal groove 'in. the slide, after which a flexible airtigh ' ty.tub ' .e is- placed into it',: 1 which." " tubeLis then inflated to press the foils against the inner walls of . the. slide. In this way . an airtight sealing of. two or more,"foils'- can-.be-obtained-by . simple means, which sealing can be released .without damage to the foil, as the inflated ' tube will press, the foils with an even and constant pressure against .the inner walls of the slide. The method is also very ' quick, and can be easily practised anywhere, as there is no special need for an air pressure source,..because e.g. a hand- operated pump can easily supply . the desired pressure to the tube. When using the tool of claim 2 " the parts can be led down into the slide by . " just rolling the tool across the slide so that the materials, are put ' -.ii tthe right place in this. Finally it is appropriate as mentioned in .claim 3, to provide the tool with a backstop roll, as the placing of the foils and ' .the tube can be effected ' without the slide having ' to rest on a firm foundation. The invention will be further described in the follow¬ ing with reference' o the drawing, where Fig. 1 shows" a sectional ' view of the parts before the sealing, Fig.. 2 shows a sectional view of the parts after the sealing, Fig. 3 shows a sectional view of the parts, when being put into » place, and Fig. " shows a ' -.se.ctional. view of the parts, seen in' the direction IV- IV in ' Fig . ' 3. * _Λ- l y A ?ι - The method will be described with reference to the parts, shown in Figs 1 and 2,. i.e. ' the foils 4 and 5 which can be a sealing area of a 'foil sack or an underlaying foil 5 and a top foil 4 in a silo. Along the complete sealing area a slide 3 mainly of metal as e.g. aluminum is provided, which in the shown example 'is in the shape ' of .a hollow slide with a longitudinal opening " or " roove at the top. The. foils are first pu .-down into the slide, and then a flexible airtight tube 1 is pressed down ' into the slide at the top of the foils. The tube is " air¬ tight, as already mentioned, and. ' further provided with a supply for'pressure air/ Then a pressure is put to the. cavity ' 2 of the tube, which thereby expands and presses the foils ' 4, 5 outr.against the interio "of " 'the tube for the formation of a comple¬ tely airtight connection between' the foils, as shown in Fig. 2. When removing ' the pressure from the tube, this can easily be drawn ou of the slide together with the foils, after which the method can be repeated. Thus no damage overtakes -.the:pants;,-and thus the sealing can take place at any desired place on the foil, so that e.g. the volume of a bag may be varied according to the need. For the placing of the parts the tool shown in Figs 3 and 4 can be used. It consists of a handle or a frame 9, to the upper part of which a wheel 6 is mounted, which is rounded along ' he 'outsideiso that it can run in the groove at the top of the slide 3. In front of this wheel 6 a smaller roll 8 is ' mounted " which can " run .inside the slide and press down the foils,, as shown in Fig. ' 3. To the handle a. ' further roll 7 is mounted which can abut on "the underside of the slide, and thus ' form a c ' ouriterpres ' sure against the other wheels β and 8. When this tool, is led across the parts, the wheel β 10 presses the ' tube .down into the slide .3,"while ' the first smaller "roll 8 presses the foils 4 and 5 down in front of the , ' tub ' e 1.- Thus " the " correct placing of the parts in the slide is secured so that the parts will not be damaged -when. ' pressure ' is put to the ca- 15 vity of the tube. In order to make the handling of the tool easier, the handle 9 can ' be provided with a not-shown prolon¬ gation, so that ' you. ' can drive the tool across the 20. slide in upright ' position, when the slide is ■ - • - • -;._._ on a foundation on a level with the ground. 25 30

Claims: C A I M S 1. Method 'for an airtight. sealing ' of two foils, c h a r a c t e r i z e d i n that the sealing area of the two foils .(4, 5) -is placed into a hollow slide (3) through a longitudinal groove in the slide, after which a flexible tube (1) is placed into it, which tube is then inflated to press the ' foils (4,' 5) against the inner walls.of the slide (3). 2.. Tool for practising,the method according to claim 1, c h a r a c t e r i z e d i n that it .comprises a wheel (6) with a mainly convex outer sectional form that permits the wheel (β) to run in the groove of. the slide " (3), ' .and a further roll (8) that can run inside the slide against its end ' wall. • 5. Tool according to claim 2, c h a r a c t e r i ¬ z e d i n that a backstop roll (7) is mounted which runs against the outer end wall of the slide (3)-

Inventors: HINDSGAUL KIM, OLAFSEN WALTHER
Applicants: HINDSGAUL KIM, OLAFSEN WALTHER
Application year: 1982
Main classification: F16B5
IPC codes: B25B27, B29C65, B65B51, B65D33, B65D77, F16B2, F16B5