CN1100347A - Method and apparatus for producing tubular bodies, in particular for packaging-tubes - Google Patents

Abstract

Multi-layer plate is rolled around a longitudinal extended spool to form a pipe with overlapped edges. For sake of soldering, the overlapped edges are extruded closely by two longitudinally driving belt conveyers. The inner belt conveyer inside pipe has a longitudinal groove, which produces a pit onseam preventing melting material from extending arbitrarily. The melting material may be cooled in advance so that it will not stick onto near substance.

Description

Method and apparatus for producing tubular bodies, in particular for packaging-tubes

The present invention relates to a kind of as Patent right requirement 1 method as described in the preamble and a kind of as Patent right requirement 8 equipment as described in the preamble.

United States Patent (USP) 3,388 disclosed this equipment,, it is found that for No. 017: in the body of producing according to this method the outward flange of weld seam exist do not have on soldered and might peel off or even the solder joint that tears apart.Thereby peeling off the particulate material that gets off enters in the pipe and can stain with mixed in together can the generation inadequately of packed goods.

Have found that the solder joint that might peel off is that protrusion owing to weld seam in the welding process forms, the understanding that just is being based on this fact has just caused the present invention.The outward flange of this protrusion makes it and can not realize contacting with contiguous thing because thereby the minimum meeting of its thickness is cooled off too early.

The objective of the invention is to design the method and apparatus of more than one types in view of the above, weld seam does not wherein exist the sort of by the edge of extruding the formed not welding of material jail.

The objective of the invention is to reach by the feature that the characteristic that utilizes Patent right requirement 1 and 8 is put down in writing.

On the interior conveyer belt contiguous soldered seam crossing has a groove longitudinally, and it has provided formalize really shape and can prevent the formation at projection edge of weld seam.Guarantee the even heating at the bracing edge of paper tinsel plate by weld seam closely, thereby, the too early cooling of material avoided.Because the configuration of cannelure, weld seam will move in will taking place, thereby the outside of body body is roughly a smooth surface.

In addition, the method that obtains by the present invention has following advantage, promptly under the situation of multilayer paper tinsel plate, having only internal layer is that thing with the tubing the inside of finishing encapsulation keeps in touch, if the inward flange of metal foil layer is to cut sth. askew in the following manner, be outside the scope of internal layer other layer of stretching out the paper tinsel plate, then can guarantee the continuous connection of internal layer in the commissure.If internal layer covers other layer, by the cannelure in the interior conveyer belt, the fringe region of extension partly is pressed downward among the internal layer of this fringe region part.

The result that production method of the present invention is brought forms perfect weld seam in high-quality encapsulation tubing.

If multilayer paper tinsel plate has a metal level, an aluminium lamination is preferably arranged, by the conduction heating, contiguous plastic layer also can rise to welding temperature, and it is favourable then adopting claim 2 to 4 and 9 and 10 preferred embodiments.

When the paper tinsel plate of processing does not have metal level or metal level arranged but metal level is too thin so that can not produce sufficient welding heat by high frequency radiation the time, then adopt claim 5 to 7,10 and 11 preferred embodiment is favourable.The transmission of welding heat is by finishing as the radial drive band of soldering appliance and the contact between the paper tinsel plate in this case.

Preferably adopt steel to make as the conveyer belt of soldering appliance, by high frequency radiation their heating is had special advantage, that is: other parts near them will can not be heated.Because these conveyer belts preferably have very little quality, they not only can be heated to needed temperature soon but also can be cooled down soon, therefore, can reach high efficiency because its process velocity is fast.

In addition, increasing the operating rate band can be by reaching according to claim 12 preferred embodiment.

Describe one embodiment of the present of invention now in conjunction with the accompanying drawings in detail.

Fig. 1 is a kind of diagrammatic side views of equipment of the body of Production and Packaging pipe;

The pipe that Fig. 2 shows this equipment forms the zone, and it is the partial enlarged drawing of Fig. 1;

Fig. 3 shows the cross section that pipe forms the zone;

Fig. 4 then is the detail of Fig. 3.

Equipment shown in Figure 1 is supplied to a paper tinsel plate that pulls out from not shown conveying roller.It is aluminium sheet that one deck is arranged in the multi-layered sheet, and it is embedded between two layers of thermoplastic thin layer at least.Above when the plastic layer of tubing inboard is transmitting, being positioned at.In this equipment, thereby the paper tinsel plate is formed the tubing that has the bracing edge by continuous reeling around an axle that longitudinally stretches, and this bracing edge is welded together under the effect of heat.The endless conveyor 12 that is positioned under the paper tinsel plate is used to launch the paper tinsel plate.By guide 14, the two edges of conveyer belt 12 are bent upwards, thereby make the paper tinsel plate that is placed on the conveyer belt be subjected to roll-in around a single mandrel, and the top of this axle position conveyer belt 12 is extending longitudinally.The overlap joint edge of the paper tinsel plate of delimiting by the edge that is parallel to each other 10 interior conveyer belt 16 and outside push mutually between the conveyer belt 18.Two conveyer belts are used as compression tool.Interior conveyer belt 16 stretches as far as deflection cylinder 20 places along the axle that is positioned at shaping pipe the inside that is mentioned to above, turns back then to the inside of the tubing that forms.

Pressed orienting roll to arrive tubing to 22 at interior conveyer belt 16 and formed before regional 24, it can be conducted preheating by device 26 in its guide channel.But be provided with a welder 28 and be used for producing welding heat owing to form regional 24 places, promptly the aluminium foil of interlocking in the paper tinsel thin plate heated, thereby be not that preheating is carried out in absolute demand by the high frequency radiation conduction at tubing.Can regulate heating by measuring high frequency radiation, so the thermoplastic layer in the paper tinsel plate can be heated to the temperature that is enough to weld.In welding process and after the welding, the bracing edge of the body of formation abuts against endless conveyor 16 and 18 and mutually produce extruding.After welding, the weld seam of formation cools off by the cooling conveyer belt 30 of a circulation transmission, and the pressure that leans on interior conveyer belt 16 then is held.This pressure cooling can allow high process velocity.The body that longitudinally soldered closure is got up is cut by a cutter sweep that does not illustrate in the drawings, leaves described device along direction 32 again, and comes to an end by tube head and sealing cap are installed.

Conveyer belt 16 was how to lead at pipe shaped region 24 along above mentioned axle 34 to be carried out guiding in Fig. 2 showed, and this conveyer belt is caused deflection cylinder 20 back to be returned.The last transmission plane 16 of interior conveyer belt ' rest on the axle 34.Following transmission plane 16 " then is imported in the cannelure 36 that is arranged in the axle 34.Tubing shown in broken lines is represented with reference number 38.

Shown in Figure 3 is the schematic partial cross sectional that pipe is shaped and distinguishes, and wherein the paper tinsel plate has been rolled into the shape of pipe 38 by means of the effect of conveyer belt 12.The last transmission plane 16 of driving-belt 16 in this figure clearly show that ' how on axle 34, to be directed to, and how transmission plane 16 " is directed in groove 36 down.By elasticity welder 28, the bracing edge of the tubing 38 that outer conveyer belt 18 extruding form.

Fig. 4 shows the details that tubing forms zone 24.As can be seen from the figure: interior conveyer belt 16 has a cannelure 40, its effect be make pipe 38 pipe seam towards inside.Cannelure 40 defines the pipe seam shape that formalizes really, and prevents that by flowing of melted material of restriction in welding process bracing edge 42 and 44 from uncontrollable expansion taking place in extrusion process.This material is a thermoplastic material, particularly polyethylene, polypropylene or their copolymer.This welding plastics form the skin of the paper tinsel plate that is made into tubing 38.Except being equipped with between the plastic layer the aluminium lamination, the paper tinsel thin plate can also have other layer, as ply of paper and the adhesive layer that is used for aluminium foil.

Producing among the embodiment of device of body with a kind of paper tinsel plate of setting metal level or being equipped with an extremely thin metal level that is provided with, two conveyer belts 16 and 18 as the circulation transmission of soldering appliance are heated to needed welding temperature by high frequency radiation by conduction.Heating can form regional 24(Fig. 2 at tubing) carry out before, for outer conveyer belt 18, heating also can be carried out in tubing forms the zone by the heater of relative set.Under such situation, device 26 is not to carry out preheating as internal conveyer belt 16, but this conveyer belt once is heated to the needed temperature of welding.In an embodiment of this device,, perhaps form regional 24(Fig. 2 at tubing by installing 28) before or within this zone, can finish the heating of external conveyer belt 18.

If conveyer belt is to finish heating by high frequency radiation, the conveyer belt 16 and 18 of the transmission that then circulates preferably is formed from steel., if welding heat is by installing 28 only and directly produce in the aluminium lamination of paper tinsel thin plate, the conveyer belt 16 and 18 that is used as compression tool also can by, for example polytetrafluoroethylene (PTFE) is made.Do not need device 26 in this case.

The device 26 and 28 that is used to conduct heating generally all includes a high frequency coil; The energy that is discharged by this coil is concentrated in heated zone.The radio-frequency generator of known type can be used to provide these high frequency coils.

A described multilayer paper tinsel plate and metal level is arranged, it is that everybody is known that the multilayer paper tinsel plate of an aluminium lamination is particularly arranged.But above-mentioned device only also is suitable for the processing of the paper tinsel plate be made up of one deck thermoplastic layers.

Claims (12)

1, produce body by a paper tinsel plate (10), especially encapsulate the method for tubing, this paper tinsel plate (10) but the edge that has a medial surface and a lateral surface of forming by welding plastic and be parallel to each other and stretch, said paper tinsel plate continuous reeling and form and have edge (42 around the axle of a longitudinal extension, 44) tubing (38), described edge overlaps along limit portion, when they conveyer belts (16 of operation longitudinally in the belt driving of two circulations, when being pressed together 18), be welded together by heating, it is characterized in that: the two edges (42 that comprise the tubing that forms by this way, 44) be extruded at interior a part of periphery, in the extrusion process after applying welding heat, in entering cannelure (40) in the conveyer belt (16) to small part, this conveyer belt (16) moves in established tubing (38) lining.

2, according to the described method of claim 1, chaff (10) has multilayer, and the one deck in the intermediate layer is a metal level, it is characterized in that: the metal level at two overlap joint edges (42,44) is conducted heating by high frequency radiation.

3, according to the described method of claim 2, it is characterized in that: interior conveyer belt (16) is preheated.

4, according to the described method of claim 3, it is characterized in that: interior conveyer belt (16) is a metal tape, with before pipe (18) contacts, is promptly given heat by the mode of high-frequency heating by conduction at it.

5, according to the described method of claim 1, it is characterized in that: the conveyer belt of employed circulation annular drive (16,18) is a metal belt, and this conveyer belt is heated to the necessary temperature of welding process by high frequency radiation by conduction.

6, according to the described method of claim 3, it is characterized in that: the heating of two conveyer belts (16,18) is to carry out before they contact with the tubing that will be formed (38).

7, according to claim 5 or 6 described methods, it is characterized in that: externally conveyer belt (18) heating is to carry out in welding region in unique mode or in additional mode.

8, produce body by a paper tinsel plate (10), especially encapsulate the equipment of tubing, this paper tinsel plate (10) has the edge of an inboard and an outside and the stretching, extension that is parallel to each other, this equipment has the device (12,14) that paper tinsel plate (10) is wound into continuously body at a spool with longitudinal axis on every side, this body has edge (42,44), and they overlap along limit portion; It also includes to be used for producing and will overlap the device (26,28) that edge (42,44) welds together needed heat, and two operations longitudinally, and be used for and overlap the belt transmission conveyer belt (16,18) of circulation that edge (42,44) presses together, it is characterized in that: on the conveyer belt (16) of formed tubing (38) the inside operation, have one to be used for accepting, accept the cannelure (40) at the overlap joint edge (42,44) of formed tubing (38) to small part.

9, equipment as claimed in claim 8 is characterized in that: the device that produces welding heat comprises a high-frequency energy device (28) that directly carries out radiation on the zone to the overlap joint edge (42,44) of formed tubing (38).

10, according to claim 8 or 9 described equipment, it is characterized in that: conveyer belt (16) is to be formed from steel at least, be provided with device (26) forming outside the zone (24) of body, it internally conducts with (16) and gives heat or unique conduction heating by high frequency radiation being applied to device on the interior conveyer belt (16).

11, according to the described equipment of claim 10, it is characterized in that: outer conveyer belt (18) also is formed from steel and is provided with device (28), it by means of a kind of device with the high frequency waves radiation outside on the conveyer belt (18), these radiation areas can be shaped district (24) before at body, also can thereby carrying out unique conduction, heat by external conveyer belt (18) in the weld zone.

12, according to the described equipment of the arbitrary claim of claim 8 to 11, it is characterized in that: when when the pipe travel direction is looked, the cooling conveyer belt (30) that keeps in touch with formed tubing (38) is positioned at the rear of outer conveyer belt (18).

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