US20030024847A1 - Bag or bag-forming material of a synthetic material for vacuum preservation of articles, particularly of foodstuffs - Google Patents

Bag or bag-forming material of a synthetic material for vacuum preservation of articles, particularly of foodstuffs Download PDF

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Publication number
US20030024847A1
US20030024847A1 US10/189,013 US18901302A US2003024847A1 US 20030024847 A1 US20030024847 A1 US 20030024847A1 US 18901302 A US18901302 A US 18901302A US 2003024847 A1 US2003024847 A1 US 2003024847A1
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US
United States
Prior art keywords
bag
rough
stripes
layer sheet
foodstuffs
Prior art date
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.)
Abandoned
Application number
US10/189,013
Inventor
Alberto Malaspina
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NOUVA POLIVER DI ODDONE COLOMBA & C SNC
Nuova Poliver di Oddone Colomba and C SNC
Original Assignee
Nuova Poliver di Oddone Colomba and C SNC
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Nuova Poliver di Oddone Colomba and C SNC filed Critical Nuova Poliver di Oddone Colomba and C SNC
Assigned to NOUVA POLIVER DI ODDONE COLOMBA & C. S.N.C. reassignment NOUVA POLIVER DI ODDONE COLOMBA & C. S.N.C. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: MALASPINA, ALBERTO
Publication of US20030024847A1 publication Critical patent/US20030024847A1/en
Priority to US11/148,246 priority Critical patent/US20050227844A1/en
Abandoned legal-status Critical Current

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Classifications

    • 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
    • B65D33/00—Details of, or accessories for, sacks or bags
    • B65D33/01—Ventilation or drainage of bags
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C59/00—Surface shaping of articles, e.g. embossing; Apparatus therefor
    • B29C59/02—Surface shaping of articles, e.g. embossing; Apparatus therefor by mechanical means, e.g. pressing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B2155/00—Flexible containers made from webs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B2160/00—Shape of flexible containers
    • B31B2160/10—Shape of flexible containers rectangular and flat, i.e. without structural provision for thickness of contents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B2170/00—Construction of flexible containers
    • B31B2170/20—Construction of flexible containers having multi-layered walls, e.g. laminated or lined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B31B70/008—Stiffening or reinforcing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B31B70/60—Uniting opposed surfaces or edges; Taping
    • B31B70/64—Uniting opposed surfaces or edges; Taping by applying heat or pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B31B70/74—Auxiliary operations
    • B31B70/81—Forming or attaching accessories, e.g. opening devices, closures or tear strings

Definitions

  • This invention relates to a bag or bag-forming material of a synthetic material for the vacuum preservation of articles, particularly foodstuffs in the home.
  • bags are widely used in the home for protection and preservation of vegetables, meat, cheese and other foodstuffs in refrigerators. These bags consist of two walls of a synthetic material, joined by weldings along three edges.
  • the walls are generally multi-layer sheets made of polyethylene, which material is compatible with foodstuffs but is permeable to gases.
  • Such bags are generally closed by means of knots, clips or the like.
  • the walls of the bags consist of several layers of different materials comprising an inner layer of polyethylene, which material is compatible with foodstuffs but permeable to gases, and a layer of a material that is impermeable to gases, such as polyamide. Therefore, the air is extracted from the bag by means of a vacuum bell, then the bag is hermetically sealed also along the fourth edge defining the mouth, by means of a hot weld.
  • the main object of the present invention is therefore to provide a bag of a synthetic material for vacuum preserving foodstuffs, which will avoid the drawback of the trapped air pockets and which, at the same time, has low manufacturing costs, i.e. substantially similar to the costs of conventional bags.
  • Another object of the invention is to provide a bag having a high flexibility and shape adaptability with respect to the article contained in it.
  • a further object of the invention is to provide a bag which can be manufactured on conventional assembly lines, without a need for complex extra equipments.
  • FIG. 1 is a perspective view of a bag according to a first preferred embodiment of the invention
  • FIG. 2 diagrammatically shows a process for manufacturing the bag according to the invention
  • FIG. 3 is a perspective view of a second embodiment of a bag according to the invention.
  • a bag 10 has two walls 12 , 14 which are hot welded along a peripheral line 20 .
  • Each wall is made of a multi-layer synthetic material known per se, consisting of three or more alternating layers of polyamide and polyethylene.
  • the inmost layer is usually made of polyethylene, which material is compatible with foodstuffs and is easy to weld, while one or more of the remaining layers are made of polyamide, which imparts the bag a high mechanical strength and provides it with an effective air leak barrier.
  • At least wall 12 has three hot-printed, rough stripes 16 a , 16 b , 16 c on its inner surface, which are substantially rectilinear and extend longitudinally, preferably over the full length of the bag.
  • the number of three rough stripes is the most advantageous for bags having common sizes (e.g. about 20 cm ⁇ 30 cm), their number can be changed, two stripes or only a single stripe being sufficient in the case of long and narrow bags.
  • the width of each stripe can be changed, preferably in the range 0.5 cm to 2 cm.
  • the stripe can be printed, as shown in FIG. 2, by pressing the wall between a welding bar 22 , having a welding surface is coated with a rough, non-adhesive material 24 such as a close-mesh teflon cloth, and a smooth counterbar 28 .
  • the teflon cloth preferably has 5 to 20 meshes/cm, and more preferably 12 meshes/cm.
  • a single-layer, a polyethylene sheet 118 is coupled to wall 112 of the bag, and is joined to wall 112 by means of three rough stripes 116 a , 116 b , 116 c similar to rough stripes 16 a , 16 b , 16 c .
  • the hot imprints forming the stripes are obtained by welding a single-layer sheet 118 to multi-layer sheet 112 .
  • Such stripes can be obtained by using the same welding bar (coated with a rough, non-adhesive material) shown with reference to the preferred embodiment.
  • a further advantage of the invention is that the stripes do not significantly stiffen the wall of the bag, which therefore retains a high flexibility and shape adaptability with respect to the article contained in it.
  • the stripe is preferably rectilinear, it may be differently shaped, e.g. S-shaped. Similarly, the stripe may extend only over a longitudinal portion of the bag, rather than over its full length. Materials and sizes can be different from what has been shown, depending on requirements.
  • a bag-forming material may also be marketed, similar to the above described bag, i.e. comprising a tube made of two elongated walls welded together at opposite sides, one of the wall being hot-printed as taught above. A roll of 5 to 10 meters of such a tube is provided to the user, who will cut a desired length of the tube and seal it at one end to form the bag, then at the opposite end after insertion of an article and extraction of air.

Abstract

The bag consists of two walls made from sheets of a multi-layer, synthetic material, welded together along part of the perimeter. One of the walls has two or three rectilinear, longitudinal rough stripes on its inner surface, obtained by hot-printing and extending substantially along the full length of the bag. The stripes are obtained by pressing a welding bar, coated with a rough, non-adhesive material, such as teflon cloth, against the multi-layer sheet forming the wall of the bag.

Description

    BACKGROUND OF THE INVENTION
  • This invention relates to a bag or bag-forming material of a synthetic material for the vacuum preservation of articles, particularly foodstuffs in the home. [0001]
  • Nowadays, bags are widely used in the home for protection and preservation of vegetables, meat, cheese and other foodstuffs in refrigerators. These bags consist of two walls of a synthetic material, joined by weldings along three edges. The walls are generally multi-layer sheets made of polyethylene, which material is compatible with foodstuffs but is permeable to gases. Such bags are generally closed by means of knots, clips or the like. [0002]
  • Recently, the practice has become widespread of creating a vacuum in the bag containing the foodstuffs, in order to improve the preservation of foodstuffs subjected to a high risk of deterioration. The walls of the bags (which are welded along three edges) consist of several layers of different materials comprising an inner layer of polyethylene, which material is compatible with foodstuffs but permeable to gases, and a layer of a material that is impermeable to gases, such as polyamide. Therefore, the air is extracted from the bag by means of a vacuum bell, then the bag is hermetically sealed also along the fourth edge defining the mouth, by means of a hot weld. [0003]
  • Such operation cannot be performed in the home, because the air extraction is hindered by the mutual adhesion of the inner surfaces of the bag, which will prevent its areas which are far from the mouth from being completely emptied, and will allow air pockets to survive. Successively, such pockets will spread all over the bag so that the purpose of preventing contact between the foodstuffs and the air will be not achieved. [0004]
  • In order to overcome such drawback, it has been proposed to form bubbles or embossed crests, forming a network of grooves, on one of the walls of the bag, so that the air will be always allowed to find a way towards the mouth, where suction takes place. Although this is an effective method, the extra operations needed for this treatment require high precision and considerably increase the cost of the bag. [0005]
    • SUMMARY OF THE INVENTION
  • The main object of the present invention is therefore to provide a bag of a synthetic material for vacuum preserving foodstuffs, which will avoid the drawback of the trapped air pockets and which, at the same time, has low manufacturing costs, i.e. substantially similar to the costs of conventional bags. [0006]
  • Another object of the invention is to provide a bag having a high flexibility and shape adaptability with respect to the article contained in it. [0007]
  • A further object of the invention is to provide a bag which can be manufactured on conventional assembly lines, without a need for complex extra equipments. [0008]
  • The above-mentioned objects and advantages, and other that will become apparent below, are achieved by the invention with a bag of a synthetic material having the features recited in claim [0009] 1.
    •  BRIEF DESCRIPTION OF THE DRAWINGS
  • The invention will now be described in more detail, with reference to some preferred but not exclusive embodiments shown by way of non limiting example in the attached drawings, wherein: [0010]
  • FIG. 1 is a perspective view of a bag according to a first preferred embodiment of the invention; [0011]
  • FIG. 2 diagrammatically shows a process for manufacturing the bag according to the invention; [0012]
  • FIG. 3 is a perspective view of a second embodiment of a bag according to the invention.[0013]
    • DESCRIPTION OF THE PREFERRED EMBODIMENTS
  • With reference to the Figures, a [0014] bag 10 has two walls 12, 14 which are hot welded along a peripheral line 20. Each wall is made of a multi-layer synthetic material known per se, consisting of three or more alternating layers of polyamide and polyethylene. The inmost layer is usually made of polyethylene, which material is compatible with foodstuffs and is easy to weld, while one or more of the remaining layers are made of polyamide, which imparts the bag a high mechanical strength and provides it with an effective air leak barrier.
  • According to the invention, at least [0015] wall 12 has three hot-printed, rough stripes 16 a, 16 b, 16 c on its inner surface, which are substantially rectilinear and extend longitudinally, preferably over the full length of the bag.
  • Although the number of three rough stripes is the most advantageous for bags having common sizes (e.g. about 20 cm×30 cm), their number can be changed, two stripes or only a single stripe being sufficient in the case of long and narrow bags. Also the width of each stripe can be changed, preferably in the range 0.5 cm to 2 cm. [0016]
  • The stripe can be printed, as shown in FIG. 2, by pressing the wall between a [0017] welding bar 22, having a welding surface is coated with a rough, non-adhesive material 24 such as a close-mesh teflon cloth, and a smooth counterbar 28. The teflon cloth preferably has 5 to 20 meshes/cm, and more preferably 12 meshes/cm.
  • In a second embodiment of the bag, shown in FIG. 3, a single-layer, a [0018] polyethylene sheet 118 is coupled to wall 112 of the bag, and is joined to wall 112 by means of three rough stripes 116 a, 116 b, 116 c similar to rough stripes 16 a, 16 b, 16 c. The hot imprints forming the stripes are obtained by welding a single-layer sheet 118 to multi-layer sheet 112. Such stripes (the two sheets being welded along them) can be obtained by using the same welding bar (coated with a rough, non-adhesive material) shown with reference to the preferred embodiment.
  • This approach provides an increased protection of the outer walls against possible micro-fissures which could arise during the impact of the welding bar, particularly in the case of very thin walls and/or walls with only few polyamide layers. [0019]
  • The rough stripes have been found to effectively prevent sticking or adherence between parts of the bag, and therefore forming of air pockets. Such bags can be made by an easy and cheap process, which is simple to be executed on a conventional plant for mass production of conventional bags. [0020]
  • Moreover, since teflon, as well as welding bars, are commonly used for making the peripheral weldings of the walls, the process uses devices, materials and technologies that are common and well known in the field. [0021]
  • A further advantage of the invention is that the stripes do not significantly stiffen the wall of the bag, which therefore retains a high flexibility and shape adaptability with respect to the article contained in it. [0022]
  • The preferred embodiments of the invention which have been described above can be changed in different ways, as will be evident for the person skilled in the art, and particularly the materials and the sizes can be varied. [0023]
  • For example, although the stripe is preferably rectilinear, it may be differently shaped, e.g. S-shaped. Similarly, the stripe may extend only over a longitudinal portion of the bag, rather than over its full length. Materials and sizes can be different from what has been shown, depending on requirements. [0024]
  • Instead of a bag sealed at one end, a bag-forming material may also be marketed, similar to the above described bag, i.e. comprising a tube made of two elongated walls welded together at opposite sides, one of the wall being hot-printed as taught above. A roll of 5 to 10 meters of such a tube is provided to the user, who will cut a desired length of the tube and seal it at one end to form the bag, then at the opposite end after insertion of an article and extraction of air. [0025]
  • The disclosures in Italian Patent Application No. TO2001A000772 from which this application claims priority are incorporated herein by reference. [0026]

Claims (14)

What is claimed is:
1. A bag of a synthetic material for vacuum preservation of foodstuffs, comprising two walls joined along a peripheral welding line, wherein at least one of said walls has, on its inner surface, at least one rough stripe extending longitudinally and obtained by hot-printing.
2. The bag of claim 1, wherein said at least one rough stripe extends substantially along the full length of the bag.
3. The bag of claim 1, wherein said at least one rough stripe is substantially rectilinear.
4. The bag of claim 1, wherein said at least one wall is provided with three of said rough stripes.
5. The bag of claim 1, wherein said at least one rough stripe is obtained by pressing a welding bar having a welding surface coated with a rough, non-adhesive material, against the inner surface of said at least one wall.
6. The bag of claim 5, wherein said rough, non-adhesive material is a teflon cloth.
7. The bag of claim 6, wherein said teflon cloth has preferably 5 to 20 meshes/cm.
8. The bag of claim 6, wherein said teflon cloth has 12 meshes/cm.
9. The bag of claim 1, wherein the wall provided with rough stripes consists of a multi-layer sheet in which at least the most internal layer is compatible with foodstuffs.
10. The bag of claim 9, wherein said most internal layer is made of polyethylene.
11. The bag of claim 1, wherein the wall provided with rough stripes comprises an outer, multi-layer sheet and an inner, single-layer sheet made of a food-compatible material.
12. The bag of claim 11, wherein said inner, single-layer sheet is polyethylene.
13. The bag of claim 11, wherein said single-layer sheet is welded to the multi-layer sheet along the rough stripes.
14. A tube of a synthetic material for vacuum preservation of articles, comprising two walls joined along opposite lateral welding lines, wherein at least one of said walls has, on its inner surface, at least one rough stripe extending longitudinally and obtained by hot-printing.
US10/189,013 2001-08-03 2002-07-05 Bag or bag-forming material of a synthetic material for vacuum preservation of articles, particularly of foodstuffs Abandoned US20030024847A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US11/148,246 US20050227844A1 (en) 2001-08-03 2005-06-09 Bag or bag-forming material of a synthetic material for vacuum preservation of articles, particularly of foodstuffs

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITTO2001A000772 2001-08-03
IT2001TO000772A ITTO20010772A1 (en) 2001-08-03 2001-08-03 ENVELOPE OF PLASTIC MATERIAL FOR THE VACUUM STORAGE OF FOOD.

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US11/148,246 Abandoned US20050227844A1 (en) 2001-08-03 2005-06-09 Bag or bag-forming material of a synthetic material for vacuum preservation of articles, particularly of foodstuffs

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EP (1) EP1281625B1 (en)
AT (1) ATE273859T1 (en)
DE (1) DE60200990T2 (en)
ES (1) ES2225698T3 (en)
IT (1) ITTO20010772A1 (en)

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US6991109B1 (en) 2001-04-17 2006-01-31 Foodfresh Technologies Llc Vacuum sealable bag apparatus and method
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DE60200990T2 (en) 2005-01-05
US20050227844A1 (en) 2005-10-13
ATE273859T1 (en) 2004-09-15
ITTO20010772A1 (en) 2003-02-03
DE60200990D1 (en) 2004-09-23
EP1281625A1 (en) 2003-02-05
EP1281625B1 (en) 2004-08-18
ITTO20010772A0 (en) 2001-08-03

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