DE2014873A1 - Method and device for the production of squeeze tubes for packaging - Google Patents

Description

Ρ » MÖLLER-B0R6. DR, MANITZ DR. D ^ i «= L 201 4873

L .. _ ,, .. α FiNSTERWALD. OiPL-ING. G, i, wi ₍ ^ i, V
S MÖNCHEN 22, ROBERT-KOCH-STR. 1

Telephone 22S1 ίο

Munich, March 26th 1970 Lo / tü - L 1003

HCAD ₅ STAINES,! 2IDJ) LESEX, MGLAND

Method and device for the production of. Packaging

Quotschuben

Priority: Great Britain from March 28, 1969 Kr. 16 480/69

The invention relates to a squeeze clibara or flexible tube container | and in particular an apparatus and a method of making it.

Pinch trubcn for packaging materials such as pastes and Liquids are usually made of metal, e.g. B. lead, tin or aluminum, by impact extrusion from a small disc or a blank of the metal, -where the tubes normally have a thin, flexible side wall and a slightly thicker headboard and drainage opening · Tubes of this type have, however, deficiencies, namely in the first place that the thin walls sometimes appear during the Use of the tubes breaks with the result that their contents

00 * 840/166 · ■

is pressed out at other studs than at the opening. In addition, products react with certain properties, e. B. those that have acidic properties, such as fluoride toothpaste, chemically with the metal of the tubes, causing damage to the product and / or the Tube is caused. To this latter shortcoming too overcome, is known to be the inner wall of the tube with. provided with a protective coating, e.g. B. from an epoxy resin, a hydrocarbon wax such as paraffin or a micro-guard Although this is partially successful, it is extremely difficult to obtain a protective coating which will The inside of the tube is completely covered and is also free of holes »

A newer direction of development for this general container Art was to mold the containers entirely from synthetic plastics, but here it is again known that made of plastic materials, such as polyethylene or polyvinyl chloride, made containers for receiving certain Products unsuitable because of the permeability of the Plastic material, although the material is susceptible to attack theee products could withstand that ingredients such as solvents, steam and odorous substances migrate outside through the tube walls, and / or dfcß oxygen or other gases can penetrate inside and the contents the container can spoil. Another major disadvantage of such tubes made exclusively of plastic is that they are too flexible. "Therefore the tube part remains not squeezed together when expressing a part or its content, but tends to expand again only as soon as the pressure on it has been released, ./whether there is air inside through the emptying ring it is eiiigeeaugb »

_{# It} was recognized that most of the shortcomings encountered when using the two just mentioned. Forms of containers occur,

BATH ORIGINAL

Ö0984Ö / 188S

can be overcome by creating a composite is »where the container is a splint body, the one Inner layer made of plastic material and an outer layer made of metal. However, there has not been an effective and economically viable way of making them Composite tubes available · For example, it has been proposed to form such a tube by inserting a preformed, inner Plastic tube was made and placed on its outside a pre-formed metal foil was attached. However, with the fixing of the preformed metal foil on the Plastic tube associated with considerable difficulty, because a complete accuracy in the dimensioning of the Metal foil required, which of course would be unusable if the edge were larger or smaller would correspond to a perfect fit, wäm Beyond that the product composite tube is considered by the consumer to be non-attractive found that the metal foil must have a substantial thickness in order that it can be shaped, and this means that the composite tube is relatively heavy

It has also been proposed to produce a metal squeeze tube in the normal way, ie by impact extrusion, and then insert a flexible sleeve made of an inert material, e.g. B, polyethylene. In order for such a tube to be of any use from an economic point of view, the inner sleeve * must align with the outer | Metal tube in a tight friction fit. From this it is clear that because of the thinness of the plastic sleeve, which is necessarily included, it is basically possible to force the plastic inner sleeve into the outer metal tube precisely and effectively on a commercial production scale. ,

The most successful composite tube made of plastic / metal, the is known, is from a prefabricated, Jchichtfolieninaterlal,

-.MHBKXJA ₈ 009840/1656 bad ORIGINAL

in en

which is a / interlayer / of heat-sealable thermoplastic Material includes inlaid metal foil. The body or tubular parts of such containers are produced by winding the layered film in a mandrel and forming the overlapping parts of the film a tube-like body can be heat-sealed. These Tubes are relatively easy to produce, but they have the lack of "that it is impossible, sia without inner seams at the location of the longitudinally overlapping edges of the laminate pb to manufacture. The presence of such seams in contact is essential the content of the tube is a serious deficiency, since in the most favorable case, the content will continue to exist and in the worst case the constituents dey tube tend to calibrate to decoating. Another kangel found in tubes which have bodies wound from flat strips or foils, is that the foil layer is necessarily * extends the entire length of the body »Usually squeeze tubes are attached to the base after filling with the product by means of, for example, heat-sealing devices or sealed by ultrasonic vibrations, and the film because it extends over the entire length of the tube, the implementation and effectiveness of such sealing operations and the seals produced in this way.

Recently, a procedure for producing squeezable or flexible, tubular composite containers has been proposed, in the case of soft, a plastic metal container can be produced can, and the method of operation is wrapping a layer of metal foil around a pre-formed tube of art · » material and the production of adhesion of the metal foil falls asleep with the plastic tube. The invention provides an apparatus for producing such squeeze tubes and ebejuf & lle A modification of the basic process for forming such tubes.

. .. * «BA ° ORIGINAL

008840/1556

According to the invention "comprises an apparatus for manufacturing squeezable layer tubes by wrapping metal foil around a tube made of plastic material a Dorr., facilities for continuously moving a tube of plastic material along the mandrel, at least one supply for Metal foil in endless ribbon form, a device for wrapping the metal foil around the pipe while calibrating the pipe lengthways of the mandrel, a device to: e generation of heat in the metal foil, means for pressing the heated foil against the tube so that the adhesion of the foil to the tube to form a layer pipe is effected, and a cutting device for cutting the layer pipe to the required Lengths. The process of making a squeezable sheet- | tube involves the continuous movement of a tube of plastic material along a. Dornyf z. B. by a pipe from " dom material is extruded onto a mandrel integral with the extruder is, the continuous winding of metal foil in strip form around the plastic pipe 'while it is moved along the mandrel, generating heat in the metal foil, pressing the heated film against the tube so that the film adheres to the tube with the formation of a layered tube is effected, and the cutting of the layer tube on the required lengths.

You Tube of plastic material is preferably metal - g foil immediately after forming wrapped, and for this purpose the mandrel iBt preferably an integral part of Rohrßtrangpreßapparatur. Thus, the plastic tube will be if the extrusion head by means of which the Piastikrohr is produced is provided with a tubular extension piece, which serves as a mandrel, extruded directly onto the mandrel · This can be carried out at leichtesten if the extruder • ine with Right-angled head extruder , with the mandrel mounted within the cross-head of it of the extruder.

■ *> .- ■■■■■■■ , -. 'BADÖRIEiNAL

00 9840/1516

20U873 I.

Her extrusion head itself will normally be provided with cooling means, e.g. B. for air and / or water cooling, and since the plastic tube must be cold enough so that the metal foil wrapping can be accommodated without deformation, the mandrel is preferably also provided with cooling devices. This can have cooling water suitably the shape of an inner bore or a plurality of inner bores for circulation, and alternatively or additionally they may include an internal bore or a plurality of internal bores for the passage of cooling air. Preferably, when air cooling is used, the exterior of the dome is made with a * spiral recess ψ which communicates with the interior air passage. This is the interior of the cathedral at his back. Wärtigen end air supplied through a connection opening at the front end of the mandrel into the spiral recess

1) 6

escape on the outside of the mandrel, and on the one hand it acts directly on the cooling of the inside of the plastic tube as well as the production of a very thin "air cushion" between the mandrel and the pipe that is moved lengthways on it, this cushion helps to maintain the shape of the pipe, while it is wrapped with the metal foil.

The metal film supply preferably consists of a single m metal foil winding, which has a width which is equivalent to the outer periphery of the Plastikrohre- "or slightly exceeds this. It is wrapped around the plastic tube, while the latter moves along the mandrel, so that a longitudinal seam or a seam that slightly overlaps in the longitudinal direction is produced. Alternatively, two or more wraps of metal foil can be wound around the drill hole, each one half, or one thirds wide. of the circumference of the pipe is equivalent. If two windings are used, two longitudinal seams are produced, etc.If necessary, the film can be wound helically around the plastic pipe,

- δ - _BAD ORIQlNM.

20H873

The heating device for generating heat in the film consists of one or more high-frequency induction coils which are arranged in a suitable manner in relation to the film in order to achieve the required heating thereof. The heat required to heat the induction coil (s) is equal to that which increases the temperature of the film sufficiently so that it is bonded to the outside of the plastic tube. Preferably, the film is coated with a surface coating, e.g. B. by rolling or spray coating, made of a thermoplastic material, e.g. B. polyethylene or a copolymer of ethylene, the polymer chains of which are linked by metal ions, such as "Surlyn", which softens when heat is reduced in the film to such an extent that it breaks the bond between the film and TJj dem Plastic pipe brought about when the film is pressed against the pipe. In a preferred case, the metal foil forms part of a composite sealant, which comprises the following layers in surface order: (1) a heat-sensitive adhesive or a thermoplastic material such as polyethylene or a copolymer of ethylene whose polymer chains are linked by metal ions, such as urlyn "where the thickness of the layer does not exceed 0.025 mm (0.001 inch); (2) the metal foil layer, e.g. made of aluminum with a thickness not exceeding 0.025 mm (0.001 inchX) (3) a layer of paper which can be patterned and which suitably has a basis weight of 40 g / m, (4) a layer of polyethylene or other thermoplastic material suitably not exceeding a thickness of 0.025 mm (0.001 in.) If desired, there may be a thin layer of adhesive between layers (2) and (J). The one used herein The term "foil" includes composite laminates of which the metal foil was a component

The foil can be heated before being wrapped around the pipe is, however, the heating advantageously takes place after

0OS840 / 155 «

20U873 S

Wrapping Btatt · The induction winding is therefore preferred arranged in such a way that it encircles the mandrel, which should of course be made of an insulating material, and the tube, and suitably it is at an angle to the mandrel. This means that the winding is preferably in one Plane that is at an angle to the horizontal plane that includes the mandrel axis. If if desired, an auxiliary winding may be placed adjacent to the path of movement of the foil from the winding onto the tube. the Induction coil or the induction coils are suitably connected to a high frequency generator, to deliver high-frequency currents in the range from 1 to 5 MHz The preferred frequency is 2 MHz, and suitably the generator has a kW output of 1.5 to 6 kW. The kW output determines the maximum power that can be applied to the Winding can be transferred and thus the size of the metal foil layer, which is wound around the plastic pipe induced electromagnetic eddy currents

To improve the absorption capacity of the outer surface of the plastic pipe » for the film wrapping applied to the jjachfoleend enlarge, the surface is preferably activated thereon before the film is applied, e.g. B. by means of a flame treatment or a corona discharge.

The film or laminate containing the film is preferred wrapped around the plastic pipe by means of a series of cooperating rollers, which are similar in effect with such rollers, which are used to form metal tubes from sheet metal strips.

Pressure is applied to the film to press it firmly against the plastic tube, preferably by means of an arrangement of two rollers with the two rollers of each arrangement forming an obtuse angle of about 120 ° between them Sc becomes stripe-shaped in a typical construction

- 8 009840/1660 _BA D

Metal foil, ζ. B. made of tin or aluminum, from a winding fed, which eats arranged above a dome, lengthways a tube made of plastic material, for example by means of pull-off rollers or ribbons is pulled. The slide is becoming increasingly all around the moving pipe is wound to make a longitudinal seam on the underside of the pipe. It should be noted that an overhead seam is obtained if * the film of is fed to a winding arranged below the mandrel. The tube and the applied film then pass through the force field of the winding and while they pass through here,. they are subjected to the pressure of a roller arranged to compress the top of the assembly, then two rollers attached at 120 ° press the lower sides the assembly and then two rollers arranged at 120 ° the upper sides of the assembly and finally a single roller the seam along the bottom of the assembly.

These pressure rollers suitably have arcuate pressure surfaces; H. they are of the type called primeval glass rollers known iet, so that the slide firmly gon the pipe over it entire surface is pressed. The pressure rollers are preferably made all made of an insulating material. So they can Pressure surfaces themselves consist of a silicone rubber, which is in polytetrafluoroethylene bearings in a holder made of phenolic resin laminate (Handelfibezeichnung.ühifnol) mounted eats. The roller axes can be made of nylon.

In the preferred use of the device according to the invention, a tube made of plastic material is continuously from the Head of an extruder with a right-angled head along a internally cooled mandrel attached through the crosshead of the extruder. While the pipe extends lengthways de · Domes under the influence of the extruder screw and the am The end of the mandrel is located away from the extruder

009840/1556

20H873 Λ

Pick-up rollers "moved, the pipe is covered with metal foil or suitably wrapped in a laminate containing metal foil. Heat is induced in the foil, the foil becomes pressed against the plastic pipe by means of rollers and it the adhesion on the pipe with the formation of a composite layer pipe causes. When the layered tube cools down, it is divided into tubes of the desired length, for example by means of a drop knife or other shear mechanism.

These tubes are then connected to one end with a shoulder and The nozzle part is provided which is friction welded to the tubes can be, and further, if desired, with a Closure cap can be provided. The tubes are then used for filling through the one opposite the school gate and the opening Well done.

Basically for the production of the continuously extruded pipe Thermoplastic material used can be any of those normally used in the manufacture of plastic or plastic pipes - thermoplastic materials used in containers. Examples include olefinic polymers and copolymers, ζ. B. polyethylene, polypropylene and ethylene-propylene copolymers} Styrene polymers and copolymers, polyvinyl chloride, Polycarbonates, polyamides such as nylon, and cellulose acetate.

In the drawing, the device according to the invention for production of squeezable sheet tubes reproduced herein

Fig. 1 is a side elevational view of the apparatus showing most of the essential parts for wrapping the film around around the extruded tube and its heating}

Fig. 2 is a section length of the section line A-A of Fig. 1, the shows the position of an arrangement of the pressure pins;

- 10 -

BATH ORIGINAL

009840/1556

Jli

Fig. 3 is a diagram showing the sequence in the various pressure rollers work to wind the film around the pipe and thereby close it associate; -

Fig. 4 is a section showing the structure of one of the pressure rollers reflects;

Fig. 5 is a schematic elevation, partly in section, showing the arrangement of the dome in the cross head of an extrusion press and shows the system for cooling the dome.

In Figs. 1 and 3 strip metal foil 2 (suitably a composite film) from a supply winding (which is not shown) around a feed roll Λ made of insulating Material, e.g. B. made of a phenolic resin laminate ..with ·

¹ ■. fed

Paper or fabric insert (trademark Tufnoly, and it will around a pipe 6 made of a thermoplastic material, which runs along a dome (inside the pipe 6, see Fig. 5) is pulled, wrapped around * The wrapping is effected by rollers 8, 10 and 12, 14 and 16 and 10, which are in this Order are arranged along the pipe. Roller 8 only is shown in Fig. 1, but in Fig. 3 the type and way explained in which the various rollers lengthways and to the - pipe 6 are arranged. It follows from this that the roller 8 acts on the top of the pipe, the rollers 12 and 12 on the upper sides, the rollers 14 and 16 on the lower sides and the roller 18 on c Ie underside, so that they consecutively wind the film 2 around uu the tube 6.

At the same time as the film is twisted, it wrestles around the tube they are also subjected to heating by means of an induction winding 20 which surrounds the tube and at an angle thereto is, as can be seen most clearly from FIG. the Winding 20 is connected to a high frequency generator and induces sufficient heat in the foil to generate the Foil adjacent thermoplastic material to soften, ti. H.

009840 / 16S *

■ BATHROOM

20H873

JtI

a coating on the foil or the surface of the plastic pipe, or both, so that the foil and the Pipe are connected to each other under the applied pressure.

The third pressure rollers for bringing the film into contact, the Rollers 14 and 16 are shown in detail in Figure 2, and Figure 4 illustrates the structure of the roller heads. Every Roller iet rotatably arranged, for. B. on a pin 30 made of polytetrafluoroethylene in a holder 32 of, for example a phenolic resin laminate with a paper or fabric insert (trademark Tufnol) or another insulating material Material. The holder 32 has elongated holes 34 so that it can be set so that it is used in the manufacture of pipes, with different diameters is useful. The curved surface 36 of the roller is preferably made of a silicone rubber, B. a silicone rubber with a Shore hardness of 70, and the roller is arranged in its arrangement by means of washers 38 centered from polytetrafluoroethylene.

The tube 6 of thermoplastic material is freshly extruded from a right-angled head extruder which is indicated in Fig. 5 by the dash-dotted line · The extrusion flange 40, the cross-head flange 42 and the Cross head 44 are indicated. The mandrel basically consists of two parts, a first part 46, which is in the crosshead 44 is arranged and around which thermoplastic material is extruded and a second part 46, which to the first part is attached outside of the crosshead and around which the wrapping stage of the film on the extruded Tube takes place. The part 4G is made of insulating material, e.g. B. made of phenolic resin laminate with paper or fabric insert (trade name Tufnol).

The part 46 of the dome is drilled for air and water cooling in No. From the compressed air supply via a copper pipe

- 12 -009840 / 1588 BADORIQiNAL

20 H 87 3

supplied air occurs lengthways de? Eurehti-itte 52 and 54 in the Parts 46 and 48 'and further over the outlet opening 56 long of the spiral-shaped "incisions 58 and 60" on the outer Surfaces of the mandrel rails 46 or 48 are formed by * Likewise, cooling water is in the mandrel portion 46 through a Inlet 62 is inserted into a tee 64 and it circulates through the passages 66 and 68 and finally leaves the mandrel 46 via an outlet 70 *

The tube 6 is extruded around uia the Dor ^ part 46 and moves thereto length, thereby j by air and water, * by the passage 52, the · spiralfönttige recess 58 or * is the passages 66 and 68durchtritt cooled _f · When the tube has come onto the mandrel part 48 made of I ^ enol resin Öchichtpreßstoff (Tufnol), it is "sufficiently cooled" to be wrapped in the film material 2 and during pressing

to the pressure rollers by no deformation / suffer "The amount sat Sehichtrohr is brought down from the mandrel and means - means cut to the required lengths - not shown. Then each length is provided with a shoulder and an opening, and is ready for the filling.

-Pat a t p a rt in g e ctio ns -

Claims (1)

20H873 Claims Device for forming squeezable layered tubes by winding clay metal foil around a tube made of plastic material, characterized by a Born, a facility of continuous movement a tube made of plastic material along the Bornes, at least one supply for metal foil in endless Bandform, a device for wrapping the metal foil around the pipe while the drill runs along the Bornes moved, a device for generating heat in the metal foil, a device for pressing the heated Foil against the pipe, causing the foil to adhere to the pipe / forming a layer pipe it, and a Cutting device sum cutting the layer pipe the required lengths 2 · Device according to claim 1, characterized by an internally cooled well. 5 · Device according to claim 2, characterized by a Born with at least one inner bore is provided for the passage of cooling water. 4. Apparatus according to claim 2 or 3, characterized by a well, which is provided with at least one inner bore for the passage of cooling air. 5. Apparatus according to claim 4, characterized through a hole for the passage of air which ait one trained on the exterior & side of the cathedral spiral recess is in communication. BATH 001840/156 20H873 ils " 6. Device according to one of claims 1 to 5 »marked by a mandrel inserted within the cross head of a right-angled head extruder is arranged. . 7. Device according to one of claims 1b is 6, characterized by a device for moving the tube length of the Bornes, which includes peeling rollers Q. Device according to one of claims 1 bi β 7 * characterized by a heat-generating device which comprises one or more induction windings which - are arranged so that they encircle the Born in the direction of movement t down from the point at which the Metal foil around the drill made of plastic material that is attached to it. moved lengthways, wrapped 9 · Device according to claim 8, characterized by one winding or several windings that lie or lie at an * angle with respect to the Bornes. .10. Device according to one of claims 1 to 9 »geke η nzeichnet by means for pressing the heated foil against the drilling, which comprises a number of rollers with a curved surface · ί 11 · Device according to claim 10, 6 «k e η η ζ e i c h η e t by rollers arranged in pairs along the length of the fountain with the obtuse angle between the Rolling of each pair is about 120 ° 12. A method for producing a squeezable layer tube, '' thereby geke η η ζ eich η β t that esj & ie continuous movement of a drill made of Kunetitoffalterial * 15 009840/1656 along a fountain, the continuous enveloping one Metal foil in strip form around the plastic tube, while moving it along the mandrel, the induction of heat in the metal foil, the pressing of the heated foil against the pipe causing the foil on the drill to form a layer pipe a and cutting off the layer tube to the required lungs, 15 · Process for the production of a squeezable layered tube, characterized in that it involves the continuous extrusion of a tube made of KunstetoffamteriAl along a dome integral with the extruder, the continuous wrapping of metal foil in strip form ring around the plastic tube as it moves along the fountain, inducing heat in the metal foil, The pressing of the heated foil against the pipe to effect the adhesion of the film to the pipe to form a Laminate and cutting off the laminate includes the required lengths. 14. Method according to claim 12 or 13, characterized in that the metal foil is a composite foil is used, which contains a metal foil. 15 · The method according to any one of claims 12 to 14, characterized gekennz eichnet that the surface of the plastic tube before wrapping the metal foil around it is activated. 16 · The method according to claim 15 »characterized in that the surface is activated, but all one "» Is subjected to Lumen treatment or a corona discharge. 17 · Squeezable layer tubes, manufactured according to the process one of claims 12 to 16. - 16 - - 0098A0 / 1 BRfi _BAD ORIGINAL