GB2195315A - Containers - Google Patents
Containers Download PDFInfo
- Publication number
- GB2195315A GB2195315A GB08722729A GB8722729A GB2195315A GB 2195315 A GB2195315 A GB 2195315A GB 08722729 A GB08722729 A GB 08722729A GB 8722729 A GB8722729 A GB 8722729A GB 2195315 A GB2195315 A GB 2195315A
- Authority
- GB
- United Kingdom
- Prior art keywords
- containers
- container
- layers
- thermoforming
- web
- 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
- 239000000463 material Substances 0.000 claims abstract description 24
- 238000003856 thermoforming Methods 0.000 claims abstract description 22
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000000853 adhesive Substances 0.000 claims abstract description 10
- 230000001070 adhesive effect Effects 0.000 claims abstract description 10
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229920001223 polyethylene glycol Polymers 0.000 claims abstract description 7
- 239000005020 polyethylene terephthalate Substances 0.000 claims abstract description 7
- 239000002202 Polyethylene glycol Substances 0.000 claims abstract description 5
- 229920000098 polyolefin Polymers 0.000 claims abstract description 5
- 235000013305 food Nutrition 0.000 claims abstract description 3
- 238000000926 separation method Methods 0.000 claims abstract description 3
- 229920001169 thermoplastic Polymers 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 11
- -1 polyethylene Polymers 0.000 claims description 8
- 239000004416 thermosoftening plastic Substances 0.000 claims description 8
- 238000011109 contamination Methods 0.000 claims description 6
- 239000000470 constituent Substances 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 5
- 239000004698 Polyethylene Substances 0.000 claims description 4
- 239000004743 Polypropylene Substances 0.000 claims description 4
- 235000015243 ice cream Nutrition 0.000 claims description 4
- 235000013310 margarine Nutrition 0.000 claims description 4
- 239000003264 margarine Substances 0.000 claims description 4
- 229920000573 polyethylene Polymers 0.000 claims description 4
- 229920000642 polymer Polymers 0.000 claims description 4
- 229920001155 polypropylene Polymers 0.000 claims description 4
- 238000002360 preparation method Methods 0.000 claims description 4
- 238000003825 pressing Methods 0.000 claims description 3
- 239000004952 Polyamide Substances 0.000 claims description 2
- 239000004793 Polystyrene Substances 0.000 claims description 2
- 229920001328 Polyvinylidene chloride Polymers 0.000 claims description 2
- PVEOYINWKBTPIZ-UHFFFAOYSA-N but-3-enoic acid Chemical class OC(=O)CC=C PVEOYINWKBTPIZ-UHFFFAOYSA-N 0.000 claims description 2
- 239000012611 container material Substances 0.000 claims description 2
- 238000007796 conventional method Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 claims description 2
- 150000002148 esters Chemical class 0.000 claims description 2
- 239000003925 fat Substances 0.000 claims description 2
- 235000019197 fats Nutrition 0.000 claims description 2
- 230000004927 fusion Effects 0.000 claims description 2
- 230000003993 interaction Effects 0.000 claims description 2
- 238000003475 lamination Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 229920002647 polyamide Polymers 0.000 claims description 2
- 229920000728 polyester Polymers 0.000 claims description 2
- 229920000139 polyethylene terephthalate Polymers 0.000 claims description 2
- 229920002223 polystyrene Polymers 0.000 claims description 2
- 239000004800 polyvinyl chloride Substances 0.000 claims description 2
- 229920000915 polyvinyl chloride Polymers 0.000 claims description 2
- 239000005033 polyvinylidene chloride Substances 0.000 claims description 2
- 238000004064 recycling Methods 0.000 claims description 2
- 238000007666 vacuum forming Methods 0.000 claims description 2
- 239000002699 waste material Substances 0.000 claims description 2
- 208000031872 Body Remains Diseases 0.000 claims 1
- 238000005520 cutting process Methods 0.000 claims 1
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
- B32B1/00—Layered products having a non-planar shape
-
- 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
- B32B27/32—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
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
-
- 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
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
-
- 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
- B29K2023/00—Use of polyalkenes 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
- B29K2067/00—Use of polyesters or derivatives thereof, as moulding material
-
- 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
- B32B2250/00—Layers arrangement
- B32B2250/24—All layers being polymeric
-
- 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
-
- 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
- B32B2367/00—Polyesters, e.g. PET, i.e. polyethylene terephthalate
-
- 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
- B32B2439/02—Open containers
-
- 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
- B32B38/00—Ancillary operations in connection with laminating processes
- B32B38/12—Deep-drawing
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
Abstract
Laminated containers for food are prepared by thermoforming different overlying polymeric sheets in a web without using adhesive, by heat fusing the web in the thermoforming areas to facilitate separation of the scrap material of the web into its separate layers. The sheets comprise olefin polymers and poly- ethylene terephthalate esters of glycol or poly-ethylene glycol.
Description
SPECIFICATION
Containers
This invention relates to containers and their manufacture from laminated thermoplastic sheet material.
Containers such as tubs for margarine, icecream and other products of the food and other industries, are commonly made from thermoplastic sheet material by thermo-forming methods in which part of the sheet is heated and drawn by pressure or vacuum into a mould, the formed container then being cut from the web of sheet material. The sheet material is selected to provide a mechanically robust container from an economically thin web and it may also be required to accept printing and meet other requirements, including in particular avoiding interaction between the container material and its contents. For this reason such containers may be made from laminated sheet material, each lamination being selected to contribute special properties appropriate to its position in the laminate.
Thus the inner lamina may be selected for resistance to contamination of the contents and the outer for mechanical strength.
The present invention provides a process for the preparation of containers by thermoforming under pressure or vacuum from a blank comprising two or more superimposed layers of thermoplastic polymer sheet material and parting surplus material from the formed container, wherein the superimposed sheets are brought into contact, substantially in the area of each container blank and in the absence of added adhesive, with contact plate means heated to fuse the layers together before thermoforming the container and wherein the contact plate means is contoured to exclude air between the layers.
Heating to fuse the superimposed layers is done before thermoforming by using contact plates only at those areas which are to be thermoformed ie. in the area of each blank, to facilitate separation af each layer for recycling from the skeletal remnants of the sheet left after removing the formed containers. Similarly, since the extent of fusion between the layers may be controlled by the pressure, temperature and time applied, the thermoformed blank area may be used to a sufficiently limited extent to permit the constituent layers of the containers themselves to be separated for recyciing after usage.
A particular advantage of the invention is that in the absence of adhesive between the layers, the rim of containers made in accordance with the invention may be rolled without contamination of the edges by adhesive.
Preferably the containers of the invention are printed on one layer only, the speed of the printing process for which is therefore higher in comparison with printing a single sheet of the full container thickness. Printing may be distorted intentionally in such a manner that the thermoforming process yields the required print design on the finished formed container. In another printed embodiment of the invention, the outer layer is transparent and reverse printed on its inner surface to protect the print from wear and the contents of the container from contamination with the print.
Different combinations of film material may be selected from a wide variety of thermoplastic polymers, including for example the polyolefins, in particular polyethylene, polypropylene and polystyrene, polyhalohydrocarbons, eg, polyvinylchloride, polyvinylidene chloride and the fluoride-polyethylenes and polypropylenes, vinylacetates, polyamides and polyesters. In particular, combinations of polyolefins with polyethylene terephthalate esters of glycol and polyethylene glycols are preferred for containers intended for use in the edible fats industry, for example for ice-cream and margarine.
The containers made in accordance with the invention may comprise two or more sheets or films of different thicknesses and three or four layers or laminates may, for example be used.
The containers may be formed by thermopressure or vacuum-forming in which the sheet material is pressed or sucked into a mould. The conventional methods of thermoforming are usually appropriate, provided the temperature and contact pressure, by contact plates achieves the desired effect of fusing the thermoplastic film material and the necessary conditions for the thermoforming process can be applied.
Separate sheets, coming from different takeoff rolls, may be combined and fed intermittently in a controlled manner via a system of feed rolls to a heating and pressing station where contact is made with a contact plate means at each of predeterminate succession of container blank zones on the web. The resulting partly fused film combination is then transferred from station to a thermoforming station and after forming the containers are cut from the sheet and the waste can be collected and separated into its constituent layers.
1. A container comprising two or more fused layers free from added adhesive, of olefine polymer with poly-ethylene terephthalate esters of glycol or poly-ethylene glycol.
2. Process for the preparation of containers as claimed in claim 1 by thermoforming under pressure or vacuum from a blank comprising two or more superimposed layers of thermoplastic sheet material selected from olefine polymers and poly-ethylene terephthalate esters of glycol or poly-ethylene glycol
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (5)
1. A container comprising two or more fused layers free from added adhesive, of olefine polymer with poly-ethylene terephthalate esters of glycol or poly-ethylene glycol.
2. Process for the preparation of containers as claimed in claim 1 by thermoforming under pressure or vacuum from a blank comprising two or more superimposed layers of thermoplastic sheet material selected from olefine polymers and poly-ethylene terephthalate esters of glycol or poly-ethylene glycol and parting surplus material from the formed container, wherein the superimposed sheets are brought into contact, substantially in the area of each container blank and in the absence of added adhesive, with contact plate means heated to fuse the layers together before thermoforming the container and wherein the contact plate means is contoured to exclude air between the layers.
3. Process according to Claim 2 wherein separate sheets from different rollers are combined to provide a web which is fed first to a heating and pressing station where the web is heated and pressed by contact plate means at a temperature at which the combined layers are fused at predetermined container blank zones and then to a thermoforming station where containers are thermoformed from the blanks, cutting the formed containers from the web and separating the skeletal remains of the web into its constituent layers.
4. Process according to Claim 2 or 3 wherein print is applied to one or some only of the layers of the container blanks.
5. Process according to Claim 4 wherein the print is applied in reverse to the inner face of an outer transparent layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08722729A GB2195315B (en) | 1984-01-25 | 1987-09-28 | Containers |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08401929A GB2153287B (en) | 1984-01-25 | 1984-01-25 | Containers |
| GB08722729A GB2195315B (en) | 1984-01-25 | 1987-09-28 | Containers |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8722729D0 GB8722729D0 (en) | 1987-11-04 |
| GB2195315A true GB2195315A (en) | 1988-04-07 |
| GB2195315B GB2195315B (en) | 1988-10-26 |
Family
ID=26287222
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08722729A Expired GB2195315B (en) | 1984-01-25 | 1987-09-28 | Containers |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2195315B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5318824A (en) * | 1986-05-02 | 1994-06-07 | Mitsui Petrochemical Industries, Ltd. | Packaging structure |
| DE29509659U1 (en) * | 1994-06-22 | 1995-09-21 | Müller Formenbau GmbH, 66687 Wadern | Plastic container |
-
1987
- 1987-09-28 GB GB08722729A patent/GB2195315B/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5318824A (en) * | 1986-05-02 | 1994-06-07 | Mitsui Petrochemical Industries, Ltd. | Packaging structure |
| DE29509659U1 (en) * | 1994-06-22 | 1995-09-21 | Müller Formenbau GmbH, 66687 Wadern | Plastic container |
Also Published As
| Publication number | Publication date |
|---|---|
| GB8722729D0 (en) | 1987-11-04 |
| GB2195315B (en) | 1988-10-26 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19960125 |