GB2160818A - Shrinkable composite sheets for forming sleeves - Google Patents
Shrinkable composite sheets for forming sleeves Download PDFInfo
- Publication number
- GB2160818A GB2160818A GB08501206A GB8501206A GB2160818A GB 2160818 A GB2160818 A GB 2160818A GB 08501206 A GB08501206 A GB 08501206A GB 8501206 A GB8501206 A GB 8501206A GB 2160818 A GB2160818 A GB 2160818A
- Authority
- GB
- United Kingdom
- Prior art keywords
- sheet
- shrinkage ratio
- thermal shrinkage
- machine direction
- film
- 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.)
- Granted
Links
Classifications
-
- 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
- B29C61/00—Shaping by liberation of internal stresses; Making preforms having internal stresses; Apparatus therefor
- B29C61/06—Making preforms having internal stresses, e.g. plastic memory
- B29C61/0608—Making preforms having internal stresses, e.g. plastic memory characterised by the configuration or structure of the preforms
- B29C61/0616—Making preforms having internal stresses, e.g. plastic memory characterised by the configuration or structure of the preforms layered or partially layered preforms, e.g. preforms with layers of adhesive or sealing compositions
-
- 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
- B32B27/06—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
- B32B27/065—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 foam
-
- 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
-
- 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
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/18—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by features of a layer of foamed material
-
- 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
- B65D23/00—Details of bottles or jars not otherwise provided for
- B65D23/08—Coverings or external coatings
- B65D23/0842—Sheets or tubes applied around the bottle with or without subsequent folding operations
- B65D23/0878—Shrunk on the bottle
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2025/00—Use of polymers of vinyl-aromatic compounds or derivatives thereof as moulding material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
- B29K2105/04—Condition, form or state of moulded material or of the material to be shaped cellular or porous
-
- 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
- B32B2266/00—Composition of foam
- B32B2266/02—Organic
- B32B2266/0214—Materials belonging to B32B27/00
- B32B2266/0221—Vinyl resin
- B32B2266/0228—Aromatic vinyl resin, 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
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/732—Dimensional properties
- B32B2307/734—Dimensional stability
- B32B2307/736—Shrinkable
-
- 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
- B32B2571/00—Protective equipment
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Laminated Bodies (AREA)
- Wrappers (AREA)
Abstract
A shrinkable composite sheet for forming sleeves around glass bottles comprises non-foamed polystyrene film 1 is bonded face-to-face to a foamed polystyrene sheet 3 (both the machine directions being aligned) using a thermoplastic methacrylate-type bonding agent 4 capable of softening at a temperature of 80 DEG C or less. The non-foamed polystyrene film is printed on one side, has a thermal shrinkage ratio of 60-80% (140 DEG C) in the machine direction, a thermal shrinkage ratio of 10-30% (140 DEG C) in the direction normal to the machine direction and a thickness of 20-40 microns. The foamed polystyrene sheet has thermal shrinkage ratio of about 60-80% (140 DEG C) in the machine direction, a thermal shrinkage ratio of about 10-30% (140 DEG C) in the direction normal to the machine direction and a thickness of 0.2-0.4 mm. The said sheet is bonded to the printed side of the film. <IMAGE>
Description
SPECIFICATION
Shrinkable composite sheets for forming sleeves
The present invention relates to a sheet for forming sleeves used to coat and protect glass bottles or the like.
Glass bottles have hitherto be protected by applying around the outer surface a sleeve formed of a thermally-shrinkable synthetic polymer and then heating to shrink said sleeve. Foamed polystyrene has been widely used for this purpose since it has good cushioning properties. However, polystyrene sheet has poor surface smoothness and low printability and, in addition, often causes sheet trouble during printing, resulting in a marked loss of yield. After printing, the sheet also tends to become scratched at the surface. When the sleeved glass bottles are continuously carried on a conveyor or by a like means, they may not move more smoothly due to unsatisfactory slipping of the surface of the sleeve and may jam on the conveyor. Furthermore, printing may wear away or become unclear due to the friction between the bottles.
As one of the solutions to such problems, Japanese Patent Application No. 57-4294 (Japanese Patent
Laid-Open Publication No. 58-122855) discloses a sleeve-forming sheet in the form of a laminate sheet comprising a shrinkable foamed polyester sheet and a shrinkable non-foamed polystrene film, said foamed sheet having a higher shrinkage ratio than that of said non-foamed film itself, and having on each face a skin layer, the surface laminated to said non-foamed film having a thicker such layer than the surface not laminated thereon, said laminated sheet having a shrinkage ratio of not more than 60% in the machine direction and a shrinkage ratio of not more than 10% in the direction normal to the machine direction, said shrinkage ratio being larger in the machine direction than in the direction normal to the machine direction, and said foamed sheet being turned inside and bonded together at the ends.
According to the teachings disclosed therein, printability and the movability of glass bottles are expected to be markedly improved by the double layer structure. However, such sheets are troublesome to prepare since the two skin layers must be of different thicknesses and the ratio of shrinkage of the foamed sheet and the non-foamed film must be different and so on. Moreover, although three methods (thermal adhesion, bonded adhesion using for instance ethylene/vinyl acetate copolymers, and co-extrusion) are disclosed for the lamination of the foamed sheets and non- foamed films they all have their disadvantages. Thermal adhesion inevitably leads to shrinkage, deformation, and irregularity in thickness of the sleeve-forming sheet, due to the heat applied.Bonding adhesion using for example ethylene/vinyl acetate copolymers gives rise to blisters between the foamed sheet and the non-foamed film due to the heat applied when the finished sleeve-forming sheet is allowed to shrink on to the associated bottle. With co-extrusion, printing is only possible with respect to the outer side of the non-foamed film, and may possibly wear away or become unclear owing to the friction between bottles.
As a result of further studies, made to eliminate the foregoing problems, a non-foamed film and a foamed polystyrene sheet have been chosen with shrinkage ratios a specific limited laminated method is applied and printing effected between the non-foamed film and the foamed polystyrene sheet (see Japanese Utility Model Application No. 59-40459).
However, when thermosetting adhesives are used, there is a workability problem, since adhesion should be effected just after application due to their setting properties. A sleeve-forming composite sheet of foamed polystyrene using thermosetting adhesives is apt to wrinkle, probably due to the fact that the thermosetting adhesives are too hard.
The present invention set out to overcome or minimise the foregoing problems.
More specifically, the present invention consists in a shrinkable composite sheet for forming sleeves around glass bottles or the like comprising (a) a non-foamed polystyrene film 20 to 40 microns thick having a thermal shrinkage ratio of 60-80% (140 C) in the machine direction and a thermal shrinkage ratio of 10-30% (140 ) in the direction normal to the machine direction bonded, by means of (b) a thermoplastic methacrylate-type bonding agent capable of softening at a temperature of 800C or less, face to face and with machine directions aligned, to (c) a foamed polystyrene sheet 0.2 to 0.4 mm thick also having a thermal shrinkage ratio of about 60-80% (140 C) in the machine direction and a thermal shrinkage ratio of about 10- 30% (140 C) in the direction normal to the machine direction. Usually, the film (a) is printed on the face bonded to foam sheet (c).
The invention further extends to the glass bottle or the like having a protective sleeve of the above composite sheet material shrunk around its surface.
The present invention will be described in more detail with reference to the accompanying drawing, which shows a section through a sleeve-forming, shrinkable composite sheet according to the present invention.
Referring to the drawing, a non-foamed polystyrene film 1 is printed at 2 on one side with trade names, patterns or bar codes. It has a thickness of 20 to 40 microns, a thermal shrinkage ratio of 60 to 80% (140 C) in the machine direction and a thermal shrinkage ratio of 10 to 30% (140 C) in the direction normal to the machine direction. A foamed polystyrene sheet 3 has a thickness of 0.2 to 4.0 mm, and is substantially similar to the non- foamed polystyrene film 1 in terms of the shrinkage ratio For instance it may posses a thermal shrinkage ratio of about 60 to 80% (140 C) in the machine direction and a thermal shrinkage ratio of about 10 to 30% (140 C) in the direction normal to the machine direction.Thermoplastic methacrylate-type bonding agent 4 which softens at a temperature of not higher than 80 C is used to bond the foamed polystyrene sheet 3 to the printed side of the non- foamed polystyrene film 1. The thermoplastic bonding agent may be diluted with an alcoholic solvent or may be of the solventless type.
The film 1 and the sheet 3 are bonded together with the machine directions aligned.
The reason for limiting the thickness of the sheet 3 to 0.2-04 mm is that a thickness of less than 0.2 mm shows an undesirable small shock absorbing ability, while thickness exceeding 0.4 mm tends to easily become broken due to deformation whereby when wound around a bottle, the sheet is easily wrinkled. The reason for restricting the thickness of the film 1 to 20-40 mictons is that for a thickness of less than 20 microns, no sufficient film strength is obtained, and that in a thickness exceeding 40 microns, no specific merit is attained in view of strength.The reason for making the thermal shrinkage ratio of the film 2 substantially equal to that of the sheet 3 is to prevent separation of the film 1 and the sheet 3 from each other, which is caused (if the thermal shrinkage ratio of the non-foamed polystyrene film 1 differs significantly from that of the foamed polystyrene film 3) when the obtained sleeve is applied over the bottle, followed by shrinkage. Furthermore, the reason for limiting the thermoplastic type bonding agent 4 to that softening at a temperature of 8000 or less is that the thermal shrinkage ratio of the film 1 and the sheet 3 can be reduced to 5% or less at a temperature of 80 C or less.
Examples
Polystyrene resin 95 parts by weight
Dialex HH-102 (Mitusubishi
Monsanto Co. Ltd.,
HI polystyrene resin 5 parts by weight
Toughprene (Asahi Kesei Co.Ltd)
Blowing agent 5 parts by weight
Pentane (Godo Yozai Co.Ltd)
A blend of the starting materials was charged into an extruder for blowing extrusion to prepare a foamed polystyrene sheet having a thickness of 0.3 mm and an expansion ratio of 7, said sheet being shrunk to 75% (140 ) in the machine direction and to only 15% (140 ) in the direction normal to the machine direction.Next, a printed non-foamed polystyrene film having a thickness of 25 microns and thermal shrinkage properties substantially equal to those of the foregoing sheet was bonded on the printed side to the first sheet, between heated rolls at 800C and with the appliation of methacrylate base bonding agent (Dainippon Ink Chemical Co. LTd) thereby forming a sleeve-forming, shrinkable composite sheet.
The sheet was then bonded together at both ends into a cylindrical form having a diameter corresponding to that of the associated bottle, was located around the bottle, and was subjected to shrinkage with hot air. The thus obtained printing of the sleeved sheet was more beautiful than that applied directly on the surface of a single-layer foamed polystyrene sheet. In addition, since the surface of the composite sheet of the present invention was covered with the non-foamed polystyrene film, it could only be scratched with difficulty.. Furthermore, the surface of the composite sheet of the present invention was also flat and smooth so that the bottles sleeved with the sheet did not ja. Unlike the sheet as disclosed in the Japanese Patent Appiication No. 57-4294, the sheet described above was easy to produce, and the printing thereon did not wear away.
According to the sleeve-forming, shrinkage composite sheet of the present invention, printing is applied to the non-foamed polystyrene film, whereby improved printability is achieved, and no sheet trouble takes place during printing, thus leading to considerable improvements in yields. In addition, since printing is applied between the non-foamed polystyrene film and the foamed polystyrene sheet, there is no possibility that printing may wear away or become unclear due to the friction between bottles. When the composite sheet is applied over the surface of a bottle as a sleeve, it hardly flaws at the surface, since the surface is covered with the non-foamed polystyrene film. Furthermore, since the surface of the composite sheet is flat and smooth, the glass bottles sleeved with it move soothly and do not jam. Unlike the sleeve-forming sheet as disclosed in Japanese Patent Application No. 57-122855), the invented sheets are easy to produce.
Claims (4)
1. A shrinkable composite sheet for forming sleeves around glass bottles or the like comprising (a) a non-foamed polystyrene film 20 to 40 microns thick having a thermal shrinkage ratio of 60-80% (140 C) in the machine direction and a thermal shrinkage ratio of 10-30% (140 ) in the direction normal to the machine direction bonded, by means of (b) a thermoplastic methacrylate-type bonding agent capable of softening at a temperature of 80 C or less, face to face and with machine directions aligned, to (c) a foamed polystyrene sheet 0.2 to 0.4 mm thick also having a thermal shrinkage ratio of about 60-80% (140 C) in the machine direction and a thermal shrinkage ratio of about 10-30% (140 C) in the direction normal to the machine direction.
2. A shrinkable composite sheet as claimed in Claim 1 in which the film (a) is printed on the face bonded to foam sheet (c).
3. A shrinkable composite sheet as claimed in Claim 1 and substantially as herein defined.
4. A glass bottle or the like- having a protective sleeve of the composite sheet material as claimed in
Claim 1, 2 or 3 shrunk around its surface.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1984095168U JPS6110833U (en) | 1984-06-27 | 1984-06-27 | Shrinkable composite sheet for sleeve formation |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8501206D0 GB8501206D0 (en) | 1985-02-20 |
| GB2160818A true GB2160818A (en) | 1986-01-02 |
| GB2160818B GB2160818B (en) | 1987-10-28 |
Family
ID=14130229
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08501206A Expired GB2160818B (en) | 1984-06-27 | 1985-01-17 | Shrinkable composite sheets for forming sleeves |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JPS6110833U (en) |
| GB (1) | GB2160818B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0233516A2 (en) * | 1986-02-15 | 1987-08-26 | REHAU AG + Co | Plastic shrinkable sleeve |
| EP0390442A2 (en) * | 1989-03-28 | 1990-10-03 | MITSUI TOATSU CHEMICALS, Inc. | Heat-shrinkable polystyrene-base foamed composite sheet |
| WO1991000177A1 (en) * | 1989-07-03 | 1991-01-10 | Ian Alexander Cran | Laminated product |
| US5861201A (en) * | 1994-02-15 | 1999-01-19 | Owens-Illinois Labels Inc. | Multilayer label material |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5844299Y2 (en) * | 1979-09-26 | 1983-10-07 | 松下電器産業株式会社 | Air conditioner refrigeration cycle |
| JPS58122855A (en) * | 1982-01-14 | 1983-07-21 | 積水化成品工業株式会社 | Sheet for forming sleeve |
-
1984
- 1984-06-27 JP JP1984095168U patent/JPS6110833U/en active Granted
-
1985
- 1985-01-17 GB GB08501206A patent/GB2160818B/en not_active Expired
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0233516A2 (en) * | 1986-02-15 | 1987-08-26 | REHAU AG + Co | Plastic shrinkable sleeve |
| EP0233516A3 (en) * | 1986-02-15 | 1989-07-12 | REHAU AG + Co | Plastic shrinkable sleeve |
| EP0390442A2 (en) * | 1989-03-28 | 1990-10-03 | MITSUI TOATSU CHEMICALS, Inc. | Heat-shrinkable polystyrene-base foamed composite sheet |
| US4966805A (en) * | 1989-03-28 | 1990-10-30 | Mitsui Toatsu Chemicals, Inc. | Heat-shrinkable polystyrene-base foamed composite sheet |
| EP0390442A3 (en) * | 1989-03-28 | 1991-05-15 | MITSUI TOATSU CHEMICALS, Inc. | Heat-shrinkable polystyrene-base foamed composite sheet |
| AU612928B2 (en) * | 1989-03-28 | 1991-07-18 | Mitsui Chemicals, Inc. | Heat-shrinkable polystyrene-base foamed composite sheet |
| WO1991000177A1 (en) * | 1989-07-03 | 1991-01-10 | Ian Alexander Cran | Laminated product |
| US5861201A (en) * | 1994-02-15 | 1999-01-19 | Owens-Illinois Labels Inc. | Multilayer label material |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6110833U (en) | 1986-01-22 |
| JPH0123803Y2 (en) | 1989-07-20 |
| GB8501206D0 (en) | 1985-02-20 |
| GB2160818B (en) | 1987-10-28 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 732E | Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977) | ||
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 20000117 |