CA2243299A1 - Twist packaging - Google Patents
Twist packaging Download PDFInfo
- Publication number
- CA2243299A1 CA2243299A1 CA002243299A CA2243299A CA2243299A1 CA 2243299 A1 CA2243299 A1 CA 2243299A1 CA 002243299 A CA002243299 A CA 002243299A CA 2243299 A CA2243299 A CA 2243299A CA 2243299 A1 CA2243299 A1 CA 2243299A1
- Authority
- CA
- Canada
- Prior art keywords
- layer
- styrene
- packaging material
- weight
- twist
- 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
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
- B32B27/302—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising aromatic vinyl (co)polymers, e.g. styrenic (co)polymers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2323/00—Polyalkenes
- B32B2323/10—Polypropylene
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2325/00—Polymers of vinyl-aromatic compounds, e.g. polystyrene
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2439/00—Containers; Receptacles
- B32B2439/70—Food packaging
Landscapes
- Laminated Bodies (AREA)
- Wrappers (AREA)
Abstract
The invention relates to a multilayer packaging material for twist packing, produced by coextrusion. It consists of at least one A layer, which is formed of a synthetic material containing polypropylene, and at least one B layer, which contains a styrene/styrene-butadiene-copolymer blend.
Description
FIL ~ ~ ~ . J AM~.~D~
~i l~.ANSLATION
TWIST PACKAGING
Technical Area The invention relates to a packaging material for twist packaging, as well as a twist package consisting of this packaging material.
State of the Art A known type of closure of complete wrappers for packaging purposes, especially of small packaged articles such as candies, is closure by turning or twisting.
In the process, the item(s) being packaged is/are enclosed within the packaging material, then sealed by lateral turning (twisting) of the packaging material on one or both sides. In the case of these twist packages, however, the packaging material must on the one hand be such that it may be turned-that is, twisted-and on the other hand be such that it retain its shape once twisting to the closed state has occurred. Only in this way is it assured that in transport and storage the packaged goods are not released from their packaging as a result of spontaneous untwisting of the film.
This twist behavior is achieved either by means of high surface friction, as in the case of polypropylene (PP), for example, and/or by breaking up the internal structure of the material, as in the case of cellophane, for example.
On the other hand, surfaces that glide readily with little friction are needed to assure that the packaging material can pass through the machinery, in the case of the production process, for example. For this reason, known PP
materials often have a top coating that is capable of sliding, which is omitted in the region of twist for the purpose of twisting.
Presentation of the Invention It is the object of the invention, therefore, to provide a packaging material with satisfactory twist behavior while at the same time assuring proper operation of the machinery.
According to the invention, a multi-layered packaging material for twist packaging that is produced by means of coextrusion is proposed, which consists of at least one layer A, which is formed of a plastic that contains polypropylene, and at least one layer B, which contains a styrene/styrene-butadiene copolymer blend.
Preferably, layers A abut layer B on both sides of the latter.
The packaging material according to the invention further exhibits the advantages that layer A contains a sealable polypropylene copolymer and layer B contains 15-25~ styrene by weight and 75-85~ styrene-butadiene copolymer by weight, relative to a total percentage of 100 by weight of the overall weight of layer B.
The invention further relates to a twist package for unitary packaged goods, such as candies, which may be produced from the aforementioned packaging material.
A Way to Carry Out the Invention The layers A, for example, are applied bilaterally to layer B by means of coextrusion, so that a multi-layered composite having the structure A-B-A results.
The thicknesses of the layers are selected from among the following ranges of percentages, such that their sum in every case must yield 100~ of the overall thickness of the layers.
A: 15-35 B: 30-60~
A: 15-35~.
The materials of layer A are plastics or blends that contain polypropylene (PP).
The PP can be either a homopolymer or a copolymer, or even a mixture (blend) of these. A copolymer affords the additional advantage of being able to seal to itself to a PP homopolymer or to PP blends.
The composition of the layer according to A can be modified by the addition of additives.
Layer B consists of a styrene/styrene-butadiene copolymer blend, where so-called "General Purpose Polystyrene" (Crystal Styrene) is suitable as the styrene component. Polystyrene having a molecular weight in excess of 200,000 and a molecular weight distribution of 2-3 is particularly preferred.
Styrene-butadiene-styrene (SBS) and styrene-butadiene-rubber (SBR) types having a 10-90~ proportion of styrene by weight and a 10-90~ proportion of butadiene by weight relative to the total weight of the copolymer are suitable as styrene-butadiene copolymers. Very good results can be achieved with a butadiene proportion of 10 to 36~ by weight.
A blend of 15-25~ by weight of high molecular weight [poly]styrene and a styrene-butadiene copolymer in the proportion of 75-85% by weight is particularly preferred.
In addition, multi-layered combinations such as A-B-A-B-A, in which the distribution of layer thicknesses are as follows, is also technically possible:
A: 13-23 B: 15-30 A: 14-24 B: 15-30~
A: 13-23~.
The sum of the individual layers must in every case be 100~ of the total thickness of the layers. These multi-layered composites do indeed exhibit a high degree of rigidity, but they are more difficult to produce.
In order to improve the adhesion of the layers to one another, adhesion promoters such as EVA, EAA, etc., for example, can be used at low thicknesses.
The fact that the outermost layer of material comprises PP-containing layer A iS critical in the production of the multi-layered packaging material according to the invention. In this way, the ability to resist water and oil is assured, as well as the decorative configuration of the packaging material by printing or metallizing.
To examine the properties of the packaging material according to the invention in the wrapping of candies, 5000 candies were individually wrapped by turning enclosure (twisting) using a candy wrapping machine as described in "Verpacken mit Kunststoffen" [Packing with Plastics], pages 231/232 (Gunther Kuhne, Carl Hanser Verlag [Publishers], Munich 1974). The twisted film segments exhibited good twisting behavior, which is brought about by layer B, so that the package did not open of its own accord as a result of untwisting. On the other hand, the package could be opened easily to allow the wrapped contents to be removed, which may be attributed to the low degree of surface friction of layer A. Furthermore, layer A assures satisfactory processability in the manufacture of the twist packaglng .
~i l~.ANSLATION
TWIST PACKAGING
Technical Area The invention relates to a packaging material for twist packaging, as well as a twist package consisting of this packaging material.
State of the Art A known type of closure of complete wrappers for packaging purposes, especially of small packaged articles such as candies, is closure by turning or twisting.
In the process, the item(s) being packaged is/are enclosed within the packaging material, then sealed by lateral turning (twisting) of the packaging material on one or both sides. In the case of these twist packages, however, the packaging material must on the one hand be such that it may be turned-that is, twisted-and on the other hand be such that it retain its shape once twisting to the closed state has occurred. Only in this way is it assured that in transport and storage the packaged goods are not released from their packaging as a result of spontaneous untwisting of the film.
This twist behavior is achieved either by means of high surface friction, as in the case of polypropylene (PP), for example, and/or by breaking up the internal structure of the material, as in the case of cellophane, for example.
On the other hand, surfaces that glide readily with little friction are needed to assure that the packaging material can pass through the machinery, in the case of the production process, for example. For this reason, known PP
materials often have a top coating that is capable of sliding, which is omitted in the region of twist for the purpose of twisting.
Presentation of the Invention It is the object of the invention, therefore, to provide a packaging material with satisfactory twist behavior while at the same time assuring proper operation of the machinery.
According to the invention, a multi-layered packaging material for twist packaging that is produced by means of coextrusion is proposed, which consists of at least one layer A, which is formed of a plastic that contains polypropylene, and at least one layer B, which contains a styrene/styrene-butadiene copolymer blend.
Preferably, layers A abut layer B on both sides of the latter.
The packaging material according to the invention further exhibits the advantages that layer A contains a sealable polypropylene copolymer and layer B contains 15-25~ styrene by weight and 75-85~ styrene-butadiene copolymer by weight, relative to a total percentage of 100 by weight of the overall weight of layer B.
The invention further relates to a twist package for unitary packaged goods, such as candies, which may be produced from the aforementioned packaging material.
A Way to Carry Out the Invention The layers A, for example, are applied bilaterally to layer B by means of coextrusion, so that a multi-layered composite having the structure A-B-A results.
The thicknesses of the layers are selected from among the following ranges of percentages, such that their sum in every case must yield 100~ of the overall thickness of the layers.
A: 15-35 B: 30-60~
A: 15-35~.
The materials of layer A are plastics or blends that contain polypropylene (PP).
The PP can be either a homopolymer or a copolymer, or even a mixture (blend) of these. A copolymer affords the additional advantage of being able to seal to itself to a PP homopolymer or to PP blends.
The composition of the layer according to A can be modified by the addition of additives.
Layer B consists of a styrene/styrene-butadiene copolymer blend, where so-called "General Purpose Polystyrene" (Crystal Styrene) is suitable as the styrene component. Polystyrene having a molecular weight in excess of 200,000 and a molecular weight distribution of 2-3 is particularly preferred.
Styrene-butadiene-styrene (SBS) and styrene-butadiene-rubber (SBR) types having a 10-90~ proportion of styrene by weight and a 10-90~ proportion of butadiene by weight relative to the total weight of the copolymer are suitable as styrene-butadiene copolymers. Very good results can be achieved with a butadiene proportion of 10 to 36~ by weight.
A blend of 15-25~ by weight of high molecular weight [poly]styrene and a styrene-butadiene copolymer in the proportion of 75-85% by weight is particularly preferred.
In addition, multi-layered combinations such as A-B-A-B-A, in which the distribution of layer thicknesses are as follows, is also technically possible:
A: 13-23 B: 15-30 A: 14-24 B: 15-30~
A: 13-23~.
The sum of the individual layers must in every case be 100~ of the total thickness of the layers. These multi-layered composites do indeed exhibit a high degree of rigidity, but they are more difficult to produce.
In order to improve the adhesion of the layers to one another, adhesion promoters such as EVA, EAA, etc., for example, can be used at low thicknesses.
The fact that the outermost layer of material comprises PP-containing layer A iS critical in the production of the multi-layered packaging material according to the invention. In this way, the ability to resist water and oil is assured, as well as the decorative configuration of the packaging material by printing or metallizing.
To examine the properties of the packaging material according to the invention in the wrapping of candies, 5000 candies were individually wrapped by turning enclosure (twisting) using a candy wrapping machine as described in "Verpacken mit Kunststoffen" [Packing with Plastics], pages 231/232 (Gunther Kuhne, Carl Hanser Verlag [Publishers], Munich 1974). The twisted film segments exhibited good twisting behavior, which is brought about by layer B, so that the package did not open of its own accord as a result of untwisting. On the other hand, the package could be opened easily to allow the wrapped contents to be removed, which may be attributed to the low degree of surface friction of layer A. Furthermore, layer A assures satisfactory processability in the manufacture of the twist packaglng .
Claims (5)
1. Multi-layered packaging material for twist packaging, produced by means of coextrusion, consisting of at least one layer A, which is made of a polypropylene-containing plastic, and at least one layer B, which contains a styrene/styrene-butadiene copolymer blend.
2. Packaging material according to claim 1, characterized by the fact that layers A adjoin layer B on both sides.
3. Packaging material according to claims 1 or 2, characterized by the fact that layer A contains a sealable polypropylene copolymer.
4. Packaging material according to one of the claims 1 through 3, characterized by the fact that layer B
contains 15-25% styrene by weight and 75-85%
styrene-butadiene copolymer by weight, relative to 100% by weight of the overall weight of layer B.
contains 15-25% styrene by weight and 75-85%
styrene-butadiene copolymer by weight, relative to 100% by weight of the overall weight of layer B.
5. Twist packaging for unitary packaged goods such as candies, characterized by the fact that it can be manufactured from a packaging material according to one of the claims 1-4.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT0201096A AT405628B (en) | 1996-11-18 | 1996-11-18 | USE OF A MULTI-LAYER PACKAGING MATERIAL PRODUCED BY COEXTRUSION FOR TWIST PACKAGING |
| ATA2010/96 | 1996-11-18 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2243299A1 true CA2243299A1 (en) | 1998-05-28 |
Family
ID=3525895
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002243299A Abandoned CA2243299A1 (en) | 1996-11-18 | 1997-11-18 | Twist packaging |
Country Status (9)
| Country | Link |
|---|---|
| EP (1) | EP0885120A1 (en) |
| AT (1) | AT405628B (en) |
| AU (1) | AU4934297A (en) |
| BR (1) | BR9707156A (en) |
| CA (1) | CA2243299A1 (en) |
| EE (1) | EE9800217A (en) |
| NO (1) | NO983296L (en) |
| PL (1) | PL327926A1 (en) |
| WO (1) | WO1998022281A1 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10105125B4 (en) * | 2001-02-05 | 2004-06-03 | Nordenia Deutschland Gronau Gmbh | Packaging film for rotary wrapping packaging |
| DE10107592B4 (en) * | 2001-02-17 | 2005-04-28 | Nordenia Deutschland Gronau | labeling film |
| ITTO20010647A1 (en) * | 2001-07-04 | 2003-01-04 | Nova Plast S R L | USE OF A MULTI-LAYER FILM MATERIAL TO REALIZE ENVELOPES. |
| ITPD20020291A1 (en) * | 2002-11-14 | 2004-05-15 | Bp Europack Spa | PACKING PARTICULARLY FOR THE PACKAGING OF FOOD PRODUCTS. |
| JP5427411B2 (en) * | 2005-11-15 | 2014-02-26 | ダウ グローバル テクノロジーズ エルエルシー | Stretched multilayer shrink label |
| DE602007009577D1 (en) | 2007-07-16 | 2010-11-11 | Rkw Se | FOILS FOR LABEL MATERIALS |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB993981A (en) * | 1961-10-10 | 1965-06-02 | William Robert Brown | Improvements in or relating to twist sealable sheet material and container, and method of making the same |
| JPS5119079A (en) * | 1974-08-09 | 1976-02-16 | Sumitomo Bakelite Co | FUKUGO FUIRUMUNAISHISHIITO |
| DE7441421U (en) * | 1974-12-12 | 1975-04-10 | Ebert Kg | Wrapper for sweets and the like |
| JPS5957748A (en) * | 1982-09-29 | 1984-04-03 | 電気化学工業株式会社 | Coextruded laminated sheet |
| DE3611341A1 (en) * | 1986-04-04 | 1987-10-08 | Hoechst Ag | OPAQUE FILM FOR THE SWEET WRAP |
| DE9111671U1 (en) * | 1991-09-19 | 1991-11-14 | Ebert Folien AG, 65201 Wiesbaden | Plastic packaging film |
| IT1251530B (en) * | 1991-10-31 | 1995-05-16 | Enichem Polimeri | THERMOPLASTIC MULTI-LAYER COUPLED |
| DE4318031A1 (en) * | 1993-05-29 | 1994-12-01 | Hoechst Ag | Resin-containing, biaxially oriented polypropylene multilayer film, process for its production and its use |
-
1996
- 1996-11-18 AT AT0201096A patent/AT405628B/en not_active IP Right Cessation
-
1997
- 1997-11-18 WO PCT/AT1997/000248 patent/WO1998022281A1/en not_active Application Discontinuation
- 1997-11-18 BR BR9707156A patent/BR9707156A/en unknown
- 1997-11-18 EE EE9800217A patent/EE9800217A/en unknown
- 1997-11-18 EP EP97911952A patent/EP0885120A1/en not_active Withdrawn
- 1997-11-18 AU AU49342/97A patent/AU4934297A/en not_active Abandoned
- 1997-11-18 PL PL97327926A patent/PL327926A1/en unknown
- 1997-11-18 CA CA002243299A patent/CA2243299A1/en not_active Abandoned
-
1998
- 1998-07-16 NO NO983296A patent/NO983296L/en not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| ATA201096A (en) | 1999-02-15 |
| AT405628B (en) | 1999-10-25 |
| WO1998022281A1 (en) | 1998-05-28 |
| BR9707156A (en) | 1999-05-18 |
| AU4934297A (en) | 1998-06-10 |
| PL327926A1 (en) | 1999-01-04 |
| NO983296D0 (en) | 1998-07-16 |
| EP0885120A1 (en) | 1998-12-23 |
| NO983296L (en) | 1998-09-17 |
| EE9800217A (en) | 1998-12-15 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |