US3920123A - Packaging under heat-shrunk film - Google Patents

Packaging under heat-shrunk film Download PDF

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Publication number
US3920123A
US3920123A US452331A US45233174A US3920123A US 3920123 A US3920123 A US 3920123A US 452331 A US452331 A US 452331A US 45233174 A US45233174 A US 45233174A US 3920123 A US3920123 A US 3920123A
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United States
Prior art keywords
film
edging
edges
glued
packaging
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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US452331A
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English (en)
Inventor
Nerio Martelli
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Solvay SA
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Solvay SA
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Publication date
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Publication of US3920123A publication Critical patent/US3920123A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D71/00—Bundles of articles held together by packaging elements for convenience of storage or transport, e.g. portable segregating carrier for plural receptacles such as beer cans or pop bottles; Bales of material
    • B65D71/06—Packaging elements holding or encircling completely or almost completely the bundle of articles, e.g. wrappers
    • B65D71/08—Wrappers shrunk by heat or under tension, e.g. stretch films or films tensioned by compressed articles
    • B65D71/10—Wrappers shrunk by heat or under tension, e.g. stretch films or films tensioned by compressed articles and provided with inserts

Definitions

  • ABSTRACT A packaging comprising a film which is folded over edge to edge to form a loop and enclosing the product to be packaged and which is heat shrunk around the latter, and an edging made of a relatively rigid material glued to the edges of the film before shrinkage has an improved tear strength when the ends of the edges of the film are not glued to the rigid edging in order to enable them to contract freely during the shrinkage.
  • FIG. 1 A first figure.
  • Thepresent invention relates to a packaging under heat-shrunk film in which one of the sides is equipped with an edging made of a relatively rigid material.
  • Packagings of the same type are already known, from German Pat. Application 1,901,104 of 10.1.1969 in the name of UNION CARBIDE. These packagings are made from a rectangle of heat-shrinkable film. The rectangle is folded in two, edge to edge, and the two folds are welded on one another by means of a glue which can be activated by heat so as to form a tube under the weld as well as an edging. The articles to be packaged are placed inside the tube whilst the edging is covered over its entire length with a relatively rigid material such as cardboard. The whole is then heated so as to bring about the shrinkage of the tubular part. It is impossible for the edging, which is covered with a non-shrinkable rigid material, to contract. Because of this, two mechanically weakened linear ,zones are created in the shrunk film along the edging. Since, furthermore, these zones terminate at their two ends at. nonwelded edges of the film, there are great risks that the film will tear at these places.
  • edges of the film are not glued to the edging in order to enable them to contract freely during the shrinkage.
  • thin films are used which have been stretched, at least in one direction and preferably in two orthogonal directions, at a temperature at which the crystallites'can become oriented. If these films are reheated at the temperature at which the stretching was carried out, the orientation tensions are liberated and the film contracts and tends to return to its original dimensions.
  • the extent of stretching, and consequently the degree of orientation and the capacity for contraction, is not critical as long as it is sufficient to make it possible to immobilize the packaged articles.
  • the thickness of the film is not critical either as long as it is sufficient to sup port the weight of the packaged articles. lngeneral, this thickness is less than 1 mm, and most frequently less than 0.5 mm.
  • the films are made of any film-formingmaterial whatsoever which can be oriented by stretching. It is I which is heat-shrunk around the latter, andan edging propylene), thermoplastic polyesters (for example, polyethylene glycol terephthalate) and polyamides. The best results are obtained with films based on a polymer which contains at least mol% of vinyl chloride and which does not contain plasticizer (less than 10% by'weight and preferably less than 5%).
  • the edgings used within the scope of the invention are made of any relatively rigid flat material whatsoever. Cardboard is preferably used. However, it is also possible to make the edgings from a sufficiently rigid plastic.
  • the edgings are glued to the edges of the film before shrinkage.
  • various methods can be used. For example, it is possible to employ an adhesive dissolved in a solvent which is removed by evaporation. If the film and the edging are made of materials which are suitable for the purpose, it is also possible to weld the film to the edging by local heating without employing any glue.
  • an adhesive which can be activated by heat, of the type commonly called hotmelt.
  • the use of these adhesives is well known in the art. They are generally based on vinyl resins.
  • a sachet open at the top, containing the articles to be packaged, forms the starting material.
  • This sachet can consist of two identical flat faces welded on three sides or of a rectangle folded in two and welded at the two lateral sides. It can also be of parallelepiped shape and can thus possess a flat bottom and lateral sides.
  • the bottom of the loop should not contain a weld but should be made by folding the film. In this way, packagings of improved mechanical strength are produced.
  • the edging used within the scope of the invention can be single or double. When it is single, it is either placed between the two edges of the film or glued to one of them which is itself glued to the other. When it is double, it can be made either of a single part and folded at its center or of two parts fixed one against the other.
  • the invention is further illustrated by the following.
  • FIG. 8 Diagrammatic front view of a packaging after shrinkage.
  • FIG. 90 Profile view in cross-section of a single edging secured between the film
  • FIG. 9b Profile view in cross-section of a single edging secured to the outer surface of the sealed edges of the film
  • FIG. 90 Profile view in cross-section ofa folded edging wtih one fold position between the film and the other on the outer surface of the film,
  • FIG. 9d Profile view in cross-section of two single edging secured to outer surfaces of the film
  • FIG. 92 Profile view in cross-section ofa folded edging secured to outer surfaces of the film.
  • FIG. 1 represents a diagrammatic front view of the prepared packaging.
  • the packaging is represented in the non-shrunk state and it does not contain any articles to be packaged. It consists of an edging l, for example made of cardboard, and of a transparent film 2, for example made of non-plasticized polyvinyl chloride.
  • FIG. 2 represents a profile view in cross-section of the same packaging.
  • FIG. 3 represents a plan view of the inside face of the opened out edging I. This edging is made from a rectangular piece of cardboard folded symmetrically along the line 8.
  • the film is also employed in the form ofa rectangular piece folded over to form a loop about the line 3 so as practically to superpose the upper edges.
  • the upper edges of the film are not glued to one another.
  • the system for closing and gluing the edging is explained by FIG. 3 wherein strips of hot-melt adhesive, with which the edgings are provided before being pressed against the upper edges of the film, are represented.
  • the strip 5 serves to join the edging firmly to one fold of the film and the strip 6 has the same function for the other fold.
  • the strip 7 serves to glue the two side portions of the edging to one another; it does not come into contact with the film.
  • the film can be employed in the form of a tubular loop open at its lateral ends, it is nevertheless preferred to weld the ends 4 so as to form a bag which is closed on three sides and open at the top. This especially prevents dust from entering inside the packaging.
  • FIG. 4 represents the same packaging as FIG. 1, from the same angle, but after shrinkage around a packaged article consisting of a cellular plate 9 made from heatshaped expanded polystyrene on which fruit 10 is placed.
  • FIG. 5 represents the same packaging seen in profile.
  • the strenghtening of the packaging is achieved by using an edging which is not so long as the upper edges of the film.
  • the edges of the film should project by at least 5 mm on either side of the edging. The best results are obtained when they project by at least 10 mm.
  • the strengthening effect is further improved by the fact that the two folds are welded laterally: There is thus no live section of the film in the vicinity of the edging which, under the effect of the weight of the packaged articles, could give rise to a tear.
  • FIG. 6 wherein the edging, opened out and equipped with strips of glue as in FIG. 3, is represented.
  • the strips of glue 5 and 6 must be stopped before the end of the edging as is represented in FIG. 6.
  • the end of the strip of glue should be at a distance of at least 1 mm from the ends of the edging. The best results are obtained when this distance is greater than 3 mm.
  • the packaging has the form indicated in FIG. 7. Here again, there is gathering of material 11, preventing tearing.
  • FIG. 9a represents a new variant of the use of double edgings.
  • FIG. 9d relates to the use of two single edgings which can be firmly attached to one another by any means whatsoever, for example clips.
  • FIG. 9e An embodiment has been represented in FIG. 9e wherein the film adhers to a double edging folded over on the entire inner surface of the latter.
  • This embodiment is particularly valuable when the articles to be packaged are very heavy.
  • the opening of the handle during shrinkage is prevented by fixing the two side portions to one another by any method whatsoever, for example clips. It is possible to pierce the two edges of the film right through by means of a single perforations; the sticking of the two side portions of the edging is thus achieved.
  • the shrinking of the film around the packaged articles is effected in accordance with well-known techniques by subjecting the packaging to a high temperature (preferably above C) for a few seconds.
  • the packagings of the invention possess advantages which are peculiar to them and which make them particularly valuable.
  • the edging can be used not only to identify the packaged products and to give various other pieces of information, but it can also serve as a handle for transporting and handling the packaging and for displaying it for sale.
  • it can be equipped with openings which co-operate with the hand, or with perforations which make it possible to slip the packagings over rods which are perpendicular to them.
  • These rods can themselves be fixed to vertical flat surfaces in display racks, or to trolleys for standardized transport. In the latter case, the trolleys can be stocked directly at the production site and it is possible to eliminate the manpower used to stock display racks by bringing the trolleys directly to the retail sites.
  • the packagings of the invention can be used for packaging a very large number of products, and espeedging made of a relatively rigid material glued to the edges of the film before shrinkage, and the ends of the edges of the film are not glued to the edging in order to enable them to contract freely during the shrinkage.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Packages (AREA)
US452331A 1973-03-28 1974-03-18 Packaging under heat-shrunk film Expired - Lifetime US3920123A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7311714A FR2223983A5 (enrdf_load_stackoverflow) 1973-03-28 1973-03-28

Publications (1)

Publication Number Publication Date
US3920123A true US3920123A (en) 1975-11-18

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ID=9117221

Family Applications (1)

Application Number Title Priority Date Filing Date
US452331A Expired - Lifetime US3920123A (en) 1973-03-28 1974-03-18 Packaging under heat-shrunk film

Country Status (11)

Country Link
US (1) US3920123A (enrdf_load_stackoverflow)
JP (1) JPS5026697A (enrdf_load_stackoverflow)
BE (1) BE812705A (enrdf_load_stackoverflow)
CA (1) CA1021736A (enrdf_load_stackoverflow)
CH (1) CH585135A5 (enrdf_load_stackoverflow)
DE (1) DE2411564A1 (enrdf_load_stackoverflow)
ES (1) ES200884Y (enrdf_load_stackoverflow)
FR (1) FR2223983A5 (enrdf_load_stackoverflow)
GB (1) GB1447732A (enrdf_load_stackoverflow)
IT (1) IT1005628B (enrdf_load_stackoverflow)
NL (1) NL7404243A (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4958735A (en) * 1985-06-28 1990-09-25 W. R. Grace & Co.-Conn. Easy open, hemetically sealed, display package made from heat shrinkable film
US20200002042A1 (en) * 2017-03-16 2020-01-02 Sealed Air Corporation (Us) Identification of shrink-wrapped objects

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7732423U1 (de) * 1976-10-25 1978-02-09 Sharp Anthony John Verkaufspackung
JPS5973263A (ja) * 1982-10-19 1984-04-25 Toyoda Mach Works Ltd 工作機械におけるワ−クテ−ブル位置決め制御装置
JPS6132056U (ja) * 1984-07-31 1986-02-26 株式会社 ト−ビ 吊下げ包装体
FR2620425A1 (fr) * 1987-09-11 1989-03-17 Tosi Patrick Dispositif d'accrochement pour emballage en film plastique
FR2730216B1 (fr) * 1995-02-08 1997-03-14 Secret Patrick Emballage de protection et presentation pour produits fragiles, irreguliers et sujets au tassement
DE102006005453B4 (de) * 2006-02-03 2008-03-13 Beiersdorf Ag Schrumpfbare Folienverpackung

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2554841A (en) * 1948-07-13 1951-05-29 Jr Herbert Rumsey Package
US2668403A (en) * 1951-02-17 1954-02-09 Jr Herbert Rumsey Method of making heat-sealed and heat-shrunk package
US3024962A (en) * 1958-03-10 1962-03-13 Bagcraft Corp Bag construction
US3142436A (en) * 1962-09-12 1964-07-28 Rotogravure Packaging Inc Bag hanger
US3203621A (en) * 1963-04-12 1965-08-31 Tompkins Label Service Inc Resealable bag-top closures
US3256941A (en) * 1964-09-23 1966-06-21 Gulf Oil Corp Bag closure
US3288347A (en) * 1965-01-15 1966-11-29 Mobil Oil Corp Support tray for produce packaging
US3424306A (en) * 1968-01-15 1969-01-28 Union Carbide Corp Package and method of producing same
US3687282A (en) * 1970-05-05 1972-08-29 Illinois Tool Works Container package

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2554841A (en) * 1948-07-13 1951-05-29 Jr Herbert Rumsey Package
US2668403A (en) * 1951-02-17 1954-02-09 Jr Herbert Rumsey Method of making heat-sealed and heat-shrunk package
US3024962A (en) * 1958-03-10 1962-03-13 Bagcraft Corp Bag construction
US3142436A (en) * 1962-09-12 1964-07-28 Rotogravure Packaging Inc Bag hanger
US3203621A (en) * 1963-04-12 1965-08-31 Tompkins Label Service Inc Resealable bag-top closures
US3256941A (en) * 1964-09-23 1966-06-21 Gulf Oil Corp Bag closure
US3288347A (en) * 1965-01-15 1966-11-29 Mobil Oil Corp Support tray for produce packaging
US3424306A (en) * 1968-01-15 1969-01-28 Union Carbide Corp Package and method of producing same
US3687282A (en) * 1970-05-05 1972-08-29 Illinois Tool Works Container package

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4958735A (en) * 1985-06-28 1990-09-25 W. R. Grace & Co.-Conn. Easy open, hemetically sealed, display package made from heat shrinkable film
US20200002042A1 (en) * 2017-03-16 2020-01-02 Sealed Air Corporation (Us) Identification of shrink-wrapped objects
US10787286B2 (en) * 2017-03-16 2020-09-29 Sealed Air Corporation (Us) Identification of shrink-wrapped objects
US11866220B2 (en) 2017-03-16 2024-01-09 Sealed Air Corporation (Us) Identification of shrink-wrapped objects

Also Published As

Publication number Publication date
BE812705A (fr) 1974-09-23
NL7404243A (enrdf_load_stackoverflow) 1974-10-01
ES200884Y (es) 1976-01-16
ES200884U (es) 1975-09-01
JPS5026697A (enrdf_load_stackoverflow) 1975-03-19
GB1447732A (en) 1976-08-25
IT1005628B (it) 1976-09-30
CH585135A5 (enrdf_load_stackoverflow) 1977-02-28
CA1021736A (en) 1977-11-29
DE2411564A1 (de) 1974-10-17
FR2223983A5 (enrdf_load_stackoverflow) 1974-10-25

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