DE2363761A1 - Procedure for packing goods in foil - packing edges are joined by welded strip before foil is shrunk - Google Patents

Abstract

Procedure for producing packing consisting of packed goods wrapped in shrunk thermoplastic foil by which a right-angular sheet of the foil is folded to form a half of a hose shape and the packed goods placed between its front and back sides. Thereafter the edges of the foil are welded together and the foil hot shrunk round the goods. The longitudinal edges of the packing are joined by overlapping welded strip of thermoplastic foil which when positioned is projecting with its ends over edges of the packing. During heating of the packing to shrink the foil the projecting ends of the strip are pressed on the packing surface and after the heating the completed packing is cooled.

Description

K 2290 / Gbm 676 ¹ FP-Dr, Wa-br December 18, 1973

description
to register the

KALLE AKTIENGESELLSCHAFT Wiesbaden-Biebrich

for a patent

A method for producing a package consisting of a shell made of thermoplastic plastic film, which is a The packaged goods fit tightly under shrinkage tension and a device for opening the packaging sleeve is opened / closed

The invention relates to a method for producing a package consisting of a package enclosing a packaged item and this tightly and tightly fitting packaging sleeve made of thermoplastic plastic film under shrinkage tension; whereby the packaging sleeve has a protrusion made of plastic having, as a handle element for an opening device the same serves.

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Plastic films that can be shrunk under the action of heat already used in many ways for packaging goods. Shrink packs made from these plastic films have the advantage of that after the shrinkage, as a result of the shrinkage tension of the film, the casing lies tightly against the packaged goods and thereby solves many packaging problems. From a foil cut Shrink packagings formed either completely enclose the packaged goods or envelop them in the manner of a banderole; in in any case, the sheaths have a weld seam.

Since the shrunk packaging sleeve is very tight to the packaged goods and is tight under tension, it is often difficult to get that Packaging envelope if required without using a suitable one Tool (scissors or knife) from the packaged goods without damaging them.

Even if such tools are at hand, there is a risk that -by handling them with the packaged goods Ripping the foil cover is damaged.

The invention is based on the object of a packaging method to propose, with the help of which it is possible in a simple manner, a packaging sleeve made of thermoplastic Plastic film to produce packaged goods that match the The packaged goods fit tightly under shrinkage tension, and the

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shrunk-on film cover as an integral part of a Flask-like device formed from foil in the shape has an outwardly protruding overhang, with the help of which the packaging sleeve can be easily "opened can.

The object on which the invention is based is achieved by a process for the production of a package, consisting of a packaged item and one that tightly encloses it Packaging sleeve made of shrunk thermoplastic Plastic film, which is made from a rectangular blank Format made of heat-shrinkable film by folding forms a half tube, the item to be packaged between the front and rear walls of the half tube from heat-shrink capable plastic film inserts, its edges welded and then, by the action of heat on the casing, causes the same to be shrunk onto the packaged goods, thereby characterized in that a tape of heat sealable Plastic film with the side welds of the cover firmly connected by welding in such a way that the attached band is longer than. the folding edge of the envelope, after that arranges the tape on the surface of the envelope in such a way that part of the tape is attached to its surface the wrapping film is adjacent, while the other part of the same

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near one side edge of the shell, one protruding outward Band loop forms, then on the cover and attached to it Tape lets heat act sufficient to shrink the shell and sufficient to shrink the tape in a heat-sealable state, and at the same time or afterwards only the part of the tape immediately adjacent to the surface of the packaging sleeve pressing the surface of the shrunk packaging casing and then the packaging cools down.

To manufacture the packaging sleeve, one starts with one rectangular cut of a weldable or heat-sealable thermoplastic plastic film with latent shrinkability the end.

A thermoplastic plastic film with latent shrinkability is characterized by the fact that it is under action sufficient heat shrinks, i.e. their. Dimensions shortened. That the. The latent heat shrinkage capacity inherent in the film is the result of a stretching orientation, the. it was subjected in its manufacture.

Heat-shrinkable ones due to stretch orientation are particularly suitable Films made of polyvinyl chloride or polypropylene are particularly preferred for producing the casing

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heat-shrinkable films by stretching
Polyethylene.

The film tape used consists of weldable or heat-sealable thermoplastic plastic film. It is essential to the invention that the film tape attached to the side welds of the cover made of latently heat-shrinkable film is longer than the folded edge of the half-tube from which the cover is formed, preferably the tape is 2 to 3 cm longer than the mentioned edge. That
The band advantageously has a width of about 1 to 2 cm.

In a preferred embodiment of the method, as
Wrapping film uses heat-shrinkable polyethylene film, the film tape consists of non-heat-shrinkable polyethylene film.

When using heat-shrinkable polyvinyl chloride film, it is particularly expedient to use a film tape
To choose PVC, one surface of which is a layer of particularly light, warm sealable synthetic polymer!
Has material, for example such from a
Mixed polymer based on vinyl chloride-vinyl acetate.

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A preferred embodiment of the method is intended to • Described with an example.

A heat-shrinkable plastic film is first formed from a rectangular blank of suitable dimensions by folding the same one axially symmetrically so-called Malbschlauch. The half tube has a front wall and a rear wall, both are connected in the area of the folding edge. Front and rear walls of the half tube are dimensioned the same.

The one that runs parallel to the folded edge of the half-tube The edge of the front or rear wall is referred to as the front wall edge or rear wall edge, which is at right angles to the folding kafite running edges of the half tube are called side edges.

The side edges or the front and rear wall edges are aligned in pairs.

The packaged goods are placed between the front and rear wall of the with its rear wall on a firm flat surface Half-tube inserted.

In the case described, two prismatic Body as packaged goods in the half tube as above

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Wei se described inserted that adjacent edges of the Packaged goods run parallel and at a distance from one another and the narrow sides of the packaged goods are closely adjacent and are arranged parallel to the folded edge of the half-tube. On the surface of the front wall of the half tube is then a film tape, for example one made of polyethylene, placed in such a way that its longitudinal edges parallel and at a distance from the folded edge of the half-tube get lost. The front edges of the tape are either aligned with the side edges of the half-tube or the The tape protrudes slightly over the side edges on both sides, with the front edges of the tape run parallel to the side edges of the half tube. Then the side and front wall edges are made the front wall and the rear wall of the half-tube are welded to one another, whereby a only this all-round enveloping shell made of latent heat-shrinkable film is formed.

The foil tape is simultaneously with the welding of the Side edges of the half tube or subsequently to it each in the area of its front edges or one in addition line running parallel and at a distance, each with a side edge of the front wall or the side welding

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seams the previously formed shell by welding in connected in such a way that the attached piece of tape is longer than the folded edge of the envelope.

By attaching a separating weld, the shell is then divided into two equal parts; the separating weld runs at right angles to the folded edge in such a way that that each of the two individual hulls formed from latent heat-shrinkable film encloses one packaged item.

Each of the two individual packaging sleeves points to the surface a foil tape on, each with its ends is welded to the side edges of a packing envelope. Because the attached tape is longer than the width of the envelope corresponds, it is possible to surface the tape on the Hül1 to be arranged so that a loop of tape is formed. The surface of the foil tape is applied to the Surface of the sheath pressed flat in such a way that a part of the band is in shape over a side edge of the sheath a loop of tape protrudes.

In this arrangement, the packaging cover with the foil tape attached to it is exposed to the effect of heat, which is sufficient the latent heat shrinkability of the film

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to loosen, and sufficient to heat-seal the film tape State.

One now presses that which is in a heat-sealable condition Foil tape with the exception of the part that protrudes laterally from the packing envelope in the form of a tape loop, to those who are also in "warm τ egel capable" state Surface of the foil envelope by, for example the dynamic pressure of a stream of hot air on the film envelope can act away from the surface of the tape and thereby presses this onto the wrapping film. It will the tape, with the exception of the tape loop, with the surface welded to the foil envelope.

The packaging envelope formed is allowed to cool. That emerges from the tape loop through the action of heat after the final Formation which results in cooling and protrudes from the packaging casing to the outside is referred to as a grip element and is suitable for tearing open the pack.

The packaging sleeve is opened in such a way that one pulls on the formed GriffeTement obliquely upwards in the longitudinal direction of the tape. The packaging sleeve tears -preferably along a parallel to the belt edge -ver-

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running line, and the packaged goods can easily be removed from the sleeve. .

It is of course also possible and represents a particularly advantageous embodiment of the variant described above of the method according to the invention, the welding of the side and front edges of the appropriately sized half-tube by means of a separating weld that is placed on the front wall of the half tube Foil tape in each ■ end of the separating weld seam integrally included and welded to the side edges of the shell; each. over the side edges parts of the tape that protrude from the shark separated in the process.

This is also the case with this form of implementation of the procedure Measure the tape so that it fits on the side edges of the envelope welded band longer than the front edge of the envelope is. It is also within the scope of the invention, a To use half-tube of greater length and to insert a large number of packaged goods in this. In the described Way are then a variety of packs with opening device manufactured] 11.

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If one assumes a half-tube in which only a single packaged item is inserted, the process is carried out in in principle carried out in the same way as described above, but with the modification that in this case the Trennschweißung the 'shell to form two individual shells "ent fä lit.

According to a variant of the method according to the invention is in the manner described above around a packaged item from a half tube by welding its side and front edges a closed envelope formed from latent heat-shrinkable film. The procedural va.ri ante should also can be described using an example. In the half tube are as described before the formation of the closed Case inserted two packaged goods as an example. At the same time or after the welding of the Seitenbzw. Front edges of the half tube to form the closed Cover around the two packaged goods, a weld seam is attached to the packaging cover in such a way that through they spatially separate the packaged goods in the packaging sleeve are separated. This spatially dividing weld seam extends, preferably in a straight line and preferably parallel to the side edges of the envelope or the packaged goods, between the folding and front edge.

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Then, on the space-dividing weld seam of the shell a film strip made of heat-sealable plastic film placed in such a way that it protrudes at least about 0.5 to 2 cm over the front edge of the shell and his Long axis of symmetry coincident with the long axis of the room-dividing weld seam of the shell runs. It is It is essential that the tape is longer than the distance between the front edge and the front edge of the half tube. A separation welding process is then carried out along the longitudinal axis of symmetry of the foil tape carried out; through the Separation welding this is halved lengthways and the shell at the same time divided into two, preferably equally large, closed envelopes. The cut-off welding process is used in each case half of the lengthways halved tape with each one of the side edges formed by the separation weld one of the individual shells firmly connected.

This variant of the method is carried out particularly advantageously in such a way that, by separating the half-tube, the formation in closed individual envelopes and the welding of a foil flag to one side edge of the individual envelope formed by the separating weld are effected at the same time.
A single cover should be understood as such

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become »the only one ώ ir · / i ge .; i'ickgut contains ".. By di it en Irenriö chwtH Y. b-r -.) ari g is the original placed on the packaging wrapper foil tape as predefined time ore i s eb I ängsh a 1 bi t he i and n each π ti Hi 1 f te de ^c > e 1 b en welded along a side edge with the side edge each one side edge formed by the separating weld. The welded half part of the FIGURE tape forms a foil flag in one side edge of a single packaging envelope. It is particularly preferred to carry out the side and front welded edges of the shell at the same time, for example in the form of separating welds.

It is essential that the one with the long edge of the single envelope ·? The welded foil flag protrudes at least about 0.5 to 2 cm above the alignment line of the front and / or the folded edge of the envelope, preferably it projects by the specified length beyond a line that represents the alignment of the FdI U antti de »envelope . The foil fin is the long edge, which is formed by the separating welding of the F <> 1 ι en h indti->, and the side of the I: » ¹ - the cover verbun lon,

The torch cover is now exposed to the action of Harme, which Ii η re i .ht to the ^r . uh rump fun g of the foil.

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2363767

This can be done, for example, by using the Cover in a circulating air cabinet that is more appropriate with air Temperature is operated, brings. By this measure not only does the film forming the shell become latent Heat shrinkability for shrinking onto the packaged goods brought, but the foil flag is simultaneously converted into a w.i rins i ege 1 capable state. By a pressing The surface of the film flag is now pressed against the surface of the shrunk film and by force with her we rs i egelt.

The foil flag is advantageously pressed on by applying the dynamic pressure of a warm air stream to the Can act surface of the foil flag. The action of the warm air currents on the foil flag can also be used in the Warming cabinet by an appropriate warm, on the Air flow directed over the surface of the film strip takes place.

The one that protrudes beyond the shrunk-on packaging sleeve The end of the foil flag now forms a protrusion protruding away from it, which acts as a pull tab for opening the packaging d i e η t.

In an advantageous embodiment of this method variant a longer one is used to form the packaging

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Half tube, places a plurality of packaged goods in this at a distance from each other, welded the side and Front edges of the half-tube and lays a multitude of room subdivisions ender weld seams, so that each individual packaged item is surrounded by a closed film envelope. Attaching the film strips or dividing the Packed in a variety of individual packs, each with a foil flag is carried out by appropriate arrangement of a plurality of foil strips in the above-described Way.

Even with this advantageous embodiment of the method variant, it is of course possible to do this in one operation the side welds, the front weld and the Separation welding process that leads to the individual packs with welded Foil flag leads to carry out.

Figures Ia, Ib, II, III and IV show one embodiment the variant of the procedure described first, FIGS. V, VI and VII explain an embodiment of the other variant of the method.

Fig. Ia shows a plan view of a closed on all sides Sene envelope made of film with latent heat shrinkability

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represents, which encloses two prismatic packaged goods, wherein on the front wall of the envelope ei η ..Fo.l i-enband _; is welded on. ^; In Fig. Ib is a package according to Ia as a view in ^:; Direction on the line BC of Fig. Ia shown.

Fig. II s te! 11 a view in the direction of D on Fig. Ia: the. Packaging.

Fig. III shows individual packs, the execution a long cut weld along the line BC of Fig. Ia have arisen. .

Fig. IV shows a packaged goods from a closed Packaging sleeve is surrounded; this consists of the packaged goods tightly fitting film under shrinkage tension and has an outwardly protruding film that serves as an opening device Handle element on. ,

In FIG. Ia, 1., the falling edge, means that from the half-tube formed film envelope from 'latent heat-shrinkable Plastic film, 2 the front welding seam of the cover, 3 their side welds. 4 the front wall of the envelope, 5 a foil tape and 6 prismatic packaged goods in the envelope.

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In Fig. Ib the digits 1, 2, 3, 4, 5 and 6 have the same Meaning as in Fig. Ia, 7 means the rear wall of the shell.

In Fig. II, the numbers 2, 3, 4, 5, 6 and 7 have the same meaning as in Fig. Ia or Ib, 5a means a tape loop.

In FIG. III, 8 denotes a prismatic single pack formed by separating welding along the line CD in FIG Filling material. The other digits have the meanings given in the above figures,

In FIG. IV, 9 denotes that which has been shrunk onto the packaged item 6 Packaging sleeve, 10 which is welded to the packaging sleeve Foil tape and 11 from the foil loop 5a Grip element formed by the action of heat according to FIG. II. The other digits in Fig. IV have the same meaning as indicated in the figures described above.

Fig. V shows a plan view of a sleeve formed from a half-tube made of latently heat-shrinkable plastic film with foil strips placed on its front wall, with there are two prismatic packaged goods in the envelope.

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Fig. VI shows a side view in the direction A of Fig. V,

Fig. VII shows a perspective view in the direction BC on Fig. V a finished package.

In Fig. V, 12 denotes a line along which the separation weld takes place through which the two prismatic Packaged goods containing envelope is divided into two closed envelopes, each containing a packaged goods. Simultaneously so that a half 16a, 16b of the strip 5 is in each case along one of its side edges with a longitudinal edge the side weld formed by the separation weld welded onto a single oil pack. 13 means the Bandübe.r was standing.

The other numbers in Fig, V have the same meaning as in Figs. I to IV.

In Fig. VI the numbers have the same meaning as in Figs. I to V.

In Fig. VII, the numeral 161b means a with its surface on the heat-shrunk plastic film existing packaging sleeve welded on foil tape, 162b its integral with the side weld of the shell

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dur.chi welded edge and 131 a handle device in the form of a band section, which is of the Packing cover protrudes outwards. The remaining digits in Fig. VII have the same meaning as in the preceding Characters.

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Claims (6)

236376T claims 1. Process for the production of a package, consisting of from one packaged item and one that tightly encloses it Packaging sleeve made of shrunk thermoplastic Plastic film, in which you can make a "blank rectangular Format made of heat-shrinkable film Folding forms a half tube that is to be packaged Insert the object between the front and rear sides of the half tube made of heat-shrinkable plastic film, its edges are welded and then, by the action of heat on the shell, the same is shrunk onto the Packaged goods, characterized in that one Tape made of heat-sealable plastic film with the side welds the sheath is firmly connected by welding in such a way that the attached band is longer as the folding edge of the envelope, then the tape on the surface of the envelope in such a way that a part the surface of the belt is adjacent to the foil, while the other part of the same has an outwardly protruding tape loop near a side edge of the envelope forms, then allows heat to act on the shell together with the tape attached to it, which is sufficient for the shell to Shrinking, and it is sufficient to keep the tape in warm 509826/0 "U8 2363767 siege! capable state, and at the same time or then only to the surface of the packaging sleeve immediately adjacent part of the tape on the surface of the shrunk packaging sleeve presses and then cools the packaging. 2. The method according to claim 1, characterized in that the welding of the front and side edges of the Hose and the welding of the ends of the foil tape. the side edges of the half tube at the same time front i mm t. 3. A method for producing a pack, consisting of a packaged item and a packaging casing that tightly encloses it made of shrunk thermoplastic Plastic film, which is made from a rectangular blank Format made of heat-shrinkable plastic film forms a half-tube by folding, which packing object between the front and rear walls of the half-tube and this by welding closes its edges and then shrinking it on by the action of heat on the shell causes the packaged goods, characterized in that one a strip of heat-sealable plastic film with 509826/0148 its longitudinal edge is welded to the side edge of the envelope, the tape being longer than the side edge the envelope, then allows heat to act on the envelope and tape, which is sufficient to cause the wrapping film to shrink effect, and the tape in a heat-sealable condition transferred, this then presses against the surface of the wrapping film and then cools the pack. 4. The method according to claim 3, characterized in that the formation of the side weld of the shell and the The band is welded to it at the same time. 5. The method according to claim 4, characterized in that the side weld ~ the film envelope and the welding of the foil tape is carried out on the envelope by a single cut-off welding process. 6. The method according to claim 1 to 4, characterized in that that the foil tape is pressed onto the surface of the envelope by means of the dynamic pressure of an air stream /. 509826 / 0U8