DK172597B1

DK172597B1 - Method for the packaging of an angular object and packaging piece for use in the method

Info

Publication number: DK172597B1
Application number: DK797A
Authority: DK
Inventors: Kurt Junker-Jensen
Original assignee: Junker Jensen Kurt
Priority date: 1997-01-03
Filing date: 1997-01-03
Publication date: 1999-02-15
Also published as: DK797A

Description

i DK 172597 B1in DK 172597 B1

Den foreliggende opfindelse angår en fremgangsmåde til emballering af en kantet genstand i krympefolie, hvor der dannes et emballageemne, som placeres over genstanden, hvorefter en krympning udføres.The present invention relates to a method of packaging an angular article in shrink film, whereby a packaging blank is formed which is placed above the article, after which a shrinkage is performed.

5 Opfindelsen angår endvidere et emballageemne til brug ved fremgangsmåden.The invention further relates to a packaging blank for use in the process.

Når kantede genstande emballeres i krympefolie, har der hidtil optrådt et problem med cn uensartet eller utilstrækkelig emballering. Idet materialet under varmepåvirkning krymper lige meget i tvær- og længderetning, vil en krympefolie, som er anbragt over 10 en kantet genstand, kunne krybe op langs en uregelmæssig eller tilspidsende flade. Der kan således opleves situationer, hvor folien trækker sig sammen ved overfladen af et kantet emne, således at det ikke slutter omkring et sådant emne.When angular items are packaged in shrink wrap, there has so far been a problem with uneven or inadequate packaging. As the material shrinks equally longitudinally and transversely, a shrink wrap disposed over an angled object can creep up along an irregular or tapered surface. Thus, situations can be experienced where the foil contracts at the surface of an angled blank so that it does not end around such a blank.

Ved emballering af lampeskærme, som har en stort set konisk form, har der vist sig 15 særlige problemer. Lampeskærme er således fremstillet af et meget tyndt materiale, som ikke tåler meget direkte varme. Det vil således ikke være ualmindeligt, at lampeskærme ødelægges ved temperaturer over 100eC. Det er således ønskeligt at anvise et materiale, som på effektiv måde kan varmkrympes ved en temperatur på ca. 100°C og fortrinsvis efter en relativ kort tids varmepåvirkning.When packing lampshades which have a largely tapered shape, 15 particular problems have been encountered. Thus, lamp shades are made of a very thin material that cannot withstand very direct heat. Thus, it will not be uncommon for lamp shades to be destroyed at temperatures above 100 ° C. Thus, it is desirable to provide a material which can effectively heat shrink at a temperature of approx. 100 ° C and preferably after a relatively short time heat effect.

20 Når emballageemnet varmepåvirkes for at krympes omkring en sådan konisk lampeskærm, er der en tendens til, at folien glider op langs lampeskærmen. Der vil således være en risiko for, at der ikke findes noget kantområde, der trækker sig ind omkring den koniske forms grundflade. Dette giver anledning til utilstrækkelig emballering og 25 kan tillige give risiko for, at emballagen glider helt af lampeskærmen. Problemerne med emballering af lampeskærme er især udtalt ved glatte lampeskærme.20 When the package blank is heat affected to shrink around such a conical lamp shade, there is a tendency for the foil to slide up along the lamp shade. Thus, there will be a risk that there will be no edge area that extends around the tapered base surface. This causes insufficient packaging and may also cause the packaging to slip completely off the lamp shade. The problems of packaging lampshades are particularly pronounced with smooth lampshades.

Der optræder et andet problem ved emballering af lampeskærme, som er fremstillet af varmefølsomme plastmaterialer. Der er således en risiko for en misfarvning på grund 30 af varmepåvirkningen af lampeskærmen under krympningen. Der vil endvidere være risiko for at beskadige andre varmefølsomme genstande under krympeemballeringen.Another problem occurs when packaging lampshades made of heat-sensitive plastic materials. Thus, there is a risk of discoloration due to the heat effect of the lamp shade during shrinkage. Furthermore, there will be a risk of damaging other heat sensitive objects during shrink packaging.

Dette kan for eksempel være tilfældet i forbindelse med levnedsmidler.This may be the case, for example, with food.

DK 172597 B1 2DK 172597 B1 2

Der har hidtil været anvendt PVC-materialer til krympning. Disse har været anvendt, da det er muligt at opnå en klar gennemsigtig folie. Dette er ønskeligt af æstetiske grunde. Det er således ønskeligt, at den emballerede genstand skal være tydelig synlig gennem krympefolien. Imidlertid er PVC uønsket af miljøhensyn. Endvidere er PVC-5 materialer uønsket, da emballageemner fremstillet af PVC ikke egner sig til længere tids lagerføring. Hvis et emballageemne af PVC-materiale lagerføres i længere tid, vil der være en risiko for at der optræder en sammenklistring, således at det er vanskeligt om ikke umuligt at åbne emballageemnet for at føre dette over den genstand, der skal emballeres.PVC materials have so far been used for shrinkage. These have been used since it is possible to obtain a clear transparent film. This is desirable for aesthetic reasons. Thus, it is desirable for the packaged article to be clearly visible through the shrink film. However, PVC is undesirable for environmental reasons. Furthermore, PVC-5 materials are undesirable as packaging items made of PVC are not suitable for long-term storage. If a PVC blank is stored for an extended period of time, there will be a risk of sticking, so that it is difficult if not impossible to open the blank to carry it over the item to be packed.

1010

Det er formålet med den foreliggende opfindelse at anvise en fremgangsmåde samt et emballageemne, som afhjælper ovennævnte ulemper, og som gør det muligt at fremstille præfabrikerede emballageemner, der på sikker måde kan benyttes til krympeem-ballering af kantede genstande.It is an object of the present invention to provide a method and a package blank which alleviate the above-mentioned drawbacks and which make it possible to prepare prefabricated packing items which can be safely used for shrink wrapping of edged items.

1515

Dette opnås ifølge den foreliggende opfindelse med en fremgangsmåde af den indledningsvis nævnte type, som er særpræget ved, at det dannede emballageemne placeres mellem beskyttelsesskærme, således at kantområder af emnet, der er indrettet for at kunne nå omkring ender af den kantede genstand, frilægges udenfor skærmene, at den 20 frilagte folie varmepåvirkes for etablering af en delvis krympning af kantområdeme, at det således forbehandlede emballageemne placeres på genstanden, og at det varmepåvirkes for etablering af krympning af folien til denne slutter tæt om genstanden.This is achieved according to the present invention with a method of the type mentioned initially, which is characterized in that the formed packaging blank is placed between protective screens, so that edge areas of the blank arranged to reach around ends of the angular object are exposed outside. the screens that the 20 exposed film is heat affected to establish a partial shrinkage of the edge areas, that the thus-prepackaged packaging blank is placed on the article and that it is heat affected to establish shrinkage of the film to it ends close to the article.

Emballageemnet, som benyttes ved fremgangsmåden, er særpræget ved, at det er 25 fremstillet af en krympeplast, som er elastisk strækbar i det mindste efter en delvis krympning.The packaging material used in the process is characterized in that it is made of a shrinkable plastic which is elastically extensible at least after a partial shrinkage.

Idet de frilagte kantområder bibringes en delvis krympning, vil det præfabrikerede emne, når dette anbringes over den genstand, der skal emballeres, på forhånd være 30 bibragt en krympning i den ønskede retning. Emballageemnet placeres, således at det forkrympede kantområde anbringes uden for den genstand, der skal emballeres. Ved den efterfølgende varmepåvirkning for krympning af folien omkring genstanden, vil DK 172597 Bl 3 kantområdeme trække sig sammen om genstandens ender. Der er således ikke risiko for, at emballageemnet ved krympningen glider på genstandens overside, således at ’ der ikke opnås en tætsluttende emballage. Det vil være muligt at præfabrikere det delvise krympede emne. Dette betyder, at selve fremstillingen af emballageemnet og 5 forkrympningen kan foretages i virksomheder, hvor der Andes dyrt udstyr hertil. Herefter kan de præfabrikerede emballageemner leveres til en forbruger, for eksempel en lampefabrikant, som kan foretage den afsluttende krympning. Den afsluttende krympning for emballering af genstande kan ske meget enkelt, for eksempel ved anvendelse af en varmepistol.As the exposed edge areas are imparted to a partial shrinkage, the prefabricated blank, when placed over the article to be packaged, will be pre-shrunk in the desired direction. The packaging blank is positioned so that the crimped edge area is placed outside the article to be packaged. By the subsequent heat effect for shrinkage of the film around the object, the edge regions will contract around the ends of the object. Thus, there is no risk of the packaging blank sliding on the top of the article during shrinkage so that no tightly sealed packaging is obtained. It will be possible to prefabricate the partially shrunk item. This means that the actual manufacture of the packaging item and the shrinkage can be carried out in companies where Andes expensive equipment for this. Subsequently, the prefabricated packaging items can be delivered to a consumer, for example a lamp manufacturer, who can make the final shrinkage. The final shrinkage for packing items can be very simple, for example using a heat gun.

1010

Da emneme kan fremstilles i virksomheder, hvor man kan foretage en passende sammensvejsning og opskæring af foliebaner for at fremstille emballageemneme, vil fremgangsmåden ifølge opfindelsen gøre det muligt for en fabrikant af mindre serier af genstande, som skal emballeres, at få foretaget en effektiv emballering. Der vil så-15 ledes ikke være behov for at sende genstandene til en traditionel emballagefabrik, hvor der foretages en krympeemballering i industrielle anlæg. Fabrikanten af de mindre serier kan ganske enkelt bestille det antal præfabrikerede emballageemner, som han har brug for. Derefter kan den afsluttende krympning ske meget enkelt uden risiko for, at emballagen kun giver en delvis dækning og beskyttelse af den genstand, der embal-20 leres.Since the blanks can be manufactured in companies where appropriate welding and cutting of foil webs can be made to produce packaging blanks, the method of the invention will enable a manufacturer of smaller batches of articles to be packaged to have efficient packaging. Consequently, there will be no need to ship the items to a traditional packaging factory where shrink packaging is done in industrial plants. The smaller series manufacturer can simply order the number of pre-made packaging items that he needs. Thereafter, the final shrinkage can be very simple without the risk that the packaging provides only partial coverage and protection of the item being packaged.

En yderligere fordel ved fremgangsmåden ifølge opfindelsen vedrører varmepåvirkningen. Idet plasten er forkrympet i kantområdeme, som skal bibringes den største krympning ind omkring enderne af en genstand, så vil der være behov for mindre 25 varmepåvirkning, når emballageemnet er anbragt på genstanden. Denne reducerede varmepåvirkning har især betydning, når der skal emballeres varmefølsomme genstande, som for eksempel plastskærme, levnedsmidler eller lignende. Den skadelige varmepåvirkning kan yderligere mindskes, såfremt der anvendes folier, som er egnet til krympning ved lave temperaturer, for eksempel polyolefiner.A further advantage of the method according to the invention relates to the heat effect. Since the plastic is shrunk in the edge regions which are to be imparted to the largest shrinkage around the ends of an article, less heat will be needed when the blank is placed on the article. This reduced heat effect is particularly important when packaging heat-sensitive objects, such as plastic screens, foodstuffs or the like. The detrimental heat effect can be further reduced if films suitable for shrinkage at low temperatures are used, for example polyolefins.

3030

Dette vil navnlig være tilfældet, når der emballeres skålformede genstande, som for eksempel lampeskærme af plast, hvor der er risiko for misfarvning. Når der emballeres 4 DK 172597 B1 lampeskærme, som typisk har en glat overflade og et konisk ydre, vil det dannede emballageemne stort set have form som en tilspidsende pose. I denne situation vil en forkrympning ske af kantområdet langs poseåbningen. Idet poseåbningen bibringes en mindre tværsnitsdimension eller grundflade end lampeskærmen, vil det være muligt at 5 krænge emballageemnet over lampeskærmen, således at det forkrympede kantområde er anbragt elastisk eftergiveligt ind over lampens kant. Emballageemnet vil let kunne krænges over lampeskærmen, når denne er anbragt på et fikstur. Det samme fikstur vil lampeskærmen være anbragt på ved den efterfølgende krympning.This will especially be the case when packaging bowl-shaped objects, such as plastic lampshades, where there is a risk of discoloration. When packaging lamp shades which typically have a smooth surface and a tapered exterior, the resulting packaging blank will largely be shaped like a tapered bag. In this situation, a shrinkage will occur of the edge area along the bag opening. As the bag opening is provided with a smaller cross-sectional dimension or base surface than the lamp shade, it will be possible to increment the package blank over the lamp shade so that the shrunk edge area is resiliently disposed inwardly over the edge of the lamp. The blank can easily be tilted over the lamp shade when placed on a fixture. For the same fixture, the lamp shade will be placed on the subsequent shrinkage.

10 Emballageemnet kan fremstilles ved, at to overlejrede folier sammensvejses og opskæres, således at der dannes et emballageemne med en ønsket form. Alternativt kan centerfoldede folier anvendes. Når der anvendes centerfoldede folier, vil det almindeligvis kun være nødvendigt at placere én svejsning i foliebanens tværretning. Dette er medvirkende til at fremme det æstetiske udseende af den indpakkede genstand. Der 15 anvendes fortrinsvis glasklare folier, således at genstanden præsenteres så tydeligt som muligt. I denne situation er det fordelagtigt, at der kun optræder en sammensvejsning i emballageemnet.The packaging blank can be made by welding and cutting two superimposed sheets to form a packaging blank with a desired shape. Alternatively, center-folded films can be used. When center-folded films are used, it will generally be necessary to place only one weld in the transverse direction of the film web. This is instrumental in promoting the aesthetic appearance of the wrapped item. Preferably, glass clear films are used so that the object is presented as clearly as possible. In this situation, it is advantageous that there is only one weld in the packaging blank.

Selv om opfindelsen er særlig fordelagtig i forbindelse med tilspidsende genstande, 20 der skal emballeres, så vil fremgangsmåden med fordel kunne benyttes til andre kantede genstande. Således vil for eksempel også cylindriske emner eller uregelmæssigt formede emner, som termokander, sammenpakkede elementer for display, som for eksempel en sammenpakket yatzyblok og yatzybæger, kunne emballeres ved en fremgangsmåde ifølge opfindelsen. Således vil emballageemnet på grund af sin elastiske 25 eftergivelighed og forkiympede tilstand være medvirkende til at foretage en indbyrdes fiksering af de emner, der skal emballeres. Hvis der emballeres en cylindrisk genstand, vil der foretages en forkrympning af kantområdeme ved hver ende af et stort set cylindrisk emballageemne. Når dette emne placeres om en cylindrisk genstand, vil de forkrympede områder virke som elastiske manchetter, der er placeret ved hver ende af 30 genstanden. Fremgangsmåden ifølge opfindelsen vil ligeledes kunne anvendes til emballering af kasseformede genstande, idet der også her vil kunne fremstilles et rørformet emballageemne, som forkrympes ved rørets endeområder.Although the invention is particularly advantageous in connection with tapered articles to be packaged, the method can advantageously be used for other angular objects. Thus, for example, cylindrical blanks or irregularly shaped blanks, such as thermos jars, compacted display elements, such as a packed yatzy block and yatzy cup, may also be packaged by a method of the invention. Thus, due to its resilient resilience and shrunken state, the packaging blank will be instrumental in fixing the items to be packaged. If a cylindrical object is packaged, a shrinkage of the edge areas will be performed at each end of a substantially cylindrical package blank. When this item is placed about a cylindrical object, the shrunken areas will act as elastic cuffs located at each end of the article. The method according to the invention can also be used for the packaging of box-shaped articles, in which case also a tubular package blank can be produced which is shrunk at the end regions of the pipe.

5 DK 172597 B15 DK 172597 B1

Opfindelsen vil herefter blive forklaret nærmere under henvisning til den medfølgende skematiske tegning, hvor fig. I skematisk illustrerer fremstillingen af et emballageemne, S fig. 2 viser et dannet emballageemne, fig. 3 viser det dannede emballageemne i forstørret målestok i et trin, hvor der foretages forkrympning af kantområdet, fig. 4 viser det dannede forkiympede emballageemne, fig. 5 viser et snit til illustration af det forkrympede emne anbragt over en lam-10 peskærm, der sidder på et fikstur, og fig. 6 viser et snit, der illustrerer en lampeskærm, der er emballeret ved fremgangsmåden ifølge opfindelsen.The invention will then be explained in more detail with reference to the accompanying schematic drawing, in which fig. In schematic illustration of the preparation of a packaging blank, S fig. Fig. 2 shows a formed blank; Figure 3 shows the enlarged scale of the formed blank in a step of shrinking the edge area; 4 shows the formed grafted packaging blank; FIG. 5 is a sectional view illustrating the shrunken blank positioned over a lamp screen mounted on a fixture; and FIG. 6 is a sectional view illustrating a lamp shade packaged by the method of the invention.

I det efterfølgende vil opfindelsen forklares under henvisning til emballering af en 15 genstand i form af en konisk lampeskærm 1 ved hjælp af et emballageemne 2.1 teg ningens forskellige figurer vil identiske eller tilsvarende elementer blive betegnet med samme henvisningsbetegnelse. Sådanne enkeltdetaljer vil således ikke blive forklaret i forbindelse med hver enkelt figur.In the following, the invention will be explained with reference to the packaging of an article in the form of a tapered lampshade 1 by means of a packaging blank 2.1 in the various figures of the drawing, identical or similar elements will be designated by the same reference numeral. Thus, such individual details will not be explained in connection with each figure.

20 I fig. 1 ses en foliebane 3 med en centerfoldning 4. De to overlejrede foliebaner sammensvejses langs en linie 5. Langs linierne 6 og 7 foretages der en opskæring. Herved fremkommer emballageemner 2, som kan adskilles fra foliebanen 3 ved, at der foretages en opskæring langs svejsningen 5. Restmaterialet 8 kan oprulles. Restmateriale 9 oprulles sammen med restmaterialet 8 ved fremstillingen. Herefter fremkommer em-25 ballageemnet 2, således som vist i fig. 2. Emballageemnet 2 har en stort set konisk poseform med en åbning 10 ved grundfladen og en åbning 11 ved den spidse ende af posen. Åbningen 11 kan udelades men vil almindeligvis anvendes af æstetiske hensyn, og da det er muligt at gribe omkring lampeskærmen 1 via åbningen 11, når lampeskærmen skal anbringes på et fikstur 12, således som forklaret senere.In FIG. 1 shows a foil web 3 with a center fold 4. The two superposed foil webs are welded along a line 5. Along lines 6 and 7 a cut is made. This results in packaging blanks 2 which can be separated from the film web 3 by cutting along the weld 5. The residual material 8 can be rolled up. Residual material 9 is coiled up with residual material 8 during manufacture. Next, the blanket blank 2, as shown in FIG. 2. The packaging blank 2 has a substantially tapered bag shape with an opening 10 at the base surface and an opening 11 at the pointed end of the bag. The aperture 11 can be omitted but will generally be used for aesthetic reasons, and since it is possible to grip the lampshade 1 via the aperture 11 when the lampshade is to be mounted on a fixture 12, as explained later.

30 I fig. 3 ses, hvorledes beskyttelsesskærme 13 afdækker en del af emballageemnet 2, således at kun et kantområde 14 er frilagt uden for skærmene (kun en skærm 13 er 6 DK 172597 B1 synlig). Det frilagte kantområde 14 opvarmes ved hjælp af en varmepistol 15 eller alternativt ved hjælp af varmluftdyser. Herved etableres en delvis krympning, således at emballageemnet 2 antager den form, som er vist i fig. 4. Det ses her, at kantområdet 14 er forkrympet på en sådan måde, at det bibringes en væsentlig mindre diameter. På 5 grund af plastens karakter vil der optræde en elastisk eftergivelighed i det forkrympede kantområde 14. Herved kan emballageemnet 2 placeres over en lampeskærm 1, således som vist i fig. 5. Der er foretaget en forkrympning, således at grundfladen eller åbningen ved emballageemnct 2 har et mindre omfang end grundfladen 16 for lampeskærmen 1. Emballageemnet 2 krænges således ned over lampeskærmen og vil med 10 den yderste kant 17 af kantområdet 14 være hindret i at glide væk fra lampeskærmen 1. Lampeskærmen 1 er monteret på fiksturet 12, som har en kuplet del 18, hvorved lampeskærmen 1 via sin holder 19 for indgreb omkring en pære kan sidde fast på fiksturet 12, når emballageemnet placeres over lampeskærmen 1. Herefter færdig-krympes emballageemnet ved hjælp af en varmluftpistol 20 eller ved hjælp af en 15 varmluftkrympetunnel. Denne færdigkrympning kan hensigtsmæssigt ske hos en lampeskærmsfabrikant, som modtager et antal præfabrikerede emner af den type, som er vist i fig. 4 fra et emballagefuma.In FIG. 3 shows how protective screens 13 cover part of the packaging blank 2 so that only one edge area 14 is exposed outside the screens (only one screen 13 is visible). The exposed edge area 14 is heated by means of a heat gun 15 or alternatively by means of hot air nozzles. Hereby a partial shrinkage is established so that the blank 2 takes the form shown in FIG. 4. It is seen here that the edge region 14 is shrunk in such a way as to give a substantially smaller diameter. Due to the nature of the plastic, an elastic resilience will occur in the pre-shrunk edge region 14. Hereby, the packaging blank 2 can be placed over a lamp shade 1, as shown in FIG. 5. A shrinkage has been made so that the base surface or opening of packaging item 2 has a smaller scope than the base surface 16 of the lamp shade 1. The packaging element 2 is thus lowered over the lamp shade and with 10 the outer edge 17 of the edge area 14 will be prevented from sliding. away from the lampshade 1. The lampshade 1 is mounted on the fixture 12, which has a domed portion 18, whereby the lampshade 1 via its holder 19 for engagement around a bulb can be fixed to the fixture 12 when the packaging item is placed over the lampshade 1. Then the shrink is finished. the blank by means of a hot air gun 20 or by means of a 15 hot air shrinkage tunnel. This final shrinkage may conveniently occur at a lampshade manufacturer receiving a number of prefabricated items of the type shown in FIG. 4 from a packaging fuma.

I fig- 6 ses den færdigemballerede lampeskærm 1. Det ses her, at kantområdet 14 ved 20 krympningen er trukket ind i lampeskærmen. Ved fremgangsmåden er det således sikret, at emballageemnet 2 ikke glider op langs den koniske lampeskærm l's yderside.Figure 6 shows the pre-packaged lamp shade 1. It is seen here that the edge area 14 at 20 shrinkage is pulled into the lamp shade. Thus, by the method, it is ensured that the packaging blank 2 does not slide up along the outside of the conical lamp shade 1.

Som eksempel på et plastmateriale, der er egnet til brug ved fremgangsmåden og til fremstilling af et emballageemne ifølge opfindelse kan som eksempel blandt flere 25 nævnes cryo-vac plast af typen D940, som kan erhverves fra firmaet W.R. Grace.As an example of a plastic material suitable for use in the process and for the manufacture of a packaging item according to the invention, there may be mentioned, for example, among several 25 cryo-vac plastics of the type D940, which can be purchased from the company W.R. Grace.

Claims

7 DK 172597 B1

A method of packaging an angular article in shrink film, forming a packaging blank which is placed above the article, after which a shrinkage is performed, characterized in that the formed packaging blank is placed between protective screens such that the edge area T of the blank is arranged for being able to reach about ends of the edged article, is exposed outside the screens that the exposed film is heat affected to establish a partial shrinkage of the edge areas, that the thus-prepared packaging blank is placed on the article and that it is hot affected to establish shrinkage of the film thereon. ends tightly around the object.

Method according to claim 1, characterized in that the article is substantially tapered, that the formed blanket is substantially in the form of a tapered bag, that an edge area is shrunk along the bag opening so as to provide an opening less than the base surface of the tapered article and that the workpiece is tilted over the article so that the edge region is resiliently disposed beyond the base surface of the article.

Method according to Claim 1 or 2, characterized in that a bowl-shaped object is preferably packaged, preferably a lampshade with a smooth surface.

Method according to any of the preceding claims, characterized in that the object is placed on a fixture during the application and shrinkage of the workpiece.

Method according to any one of the preceding claims, characterized in that a hot air gun or a hot air shrink tunnel is used for carrying out the shrinkage. Packaging blank for use in a method according to any one of the preceding claims, characterized in that it is made of a shrinkable plastic which is resiliently stretchable at least after a partial shrinkage. 8 DK 172597 B1

Packaging blank according to claim 6, characterized in that the plastic material is selected from polyolefins and is preferably a cryo-vac plastic material suitable for low temperature shrinkage.

Packaging blank according to claim 6, characterized in that the plastic material is selected from glass clear shrink films suitable for low temperature shrinkage and preferably selected from polyolefins.

Packaging blank according to claim 6, 7 or 8, characterized in that it has substantially 10 the shape of a crankcase or cylinder.