GB2599178A - A container formed from a thermo-plastic material - Google Patents
A container formed from a thermo-plastic material Download PDFInfo
- Publication number
- GB2599178A GB2599178A GB2102741.2A GB202102741A GB2599178A GB 2599178 A GB2599178 A GB 2599178A GB 202102741 A GB202102741 A GB 202102741A GB 2599178 A GB2599178 A GB 2599178A
- Authority
- GB
- United Kingdom
- Prior art keywords
- container
- ribs
- base
- concentric
- locate
- 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
- 239000012815 thermoplastic material Substances 0.000 title claims abstract description 9
- 230000002093 peripheral effect Effects 0.000 claims abstract description 13
- 235000013399 edible fruits Nutrition 0.000 claims abstract description 10
- 238000000465 moulding Methods 0.000 claims abstract description 7
- 230000000694 effects Effects 0.000 claims abstract description 6
- 235000013311 vegetables Nutrition 0.000 claims abstract description 6
- 238000010276 construction Methods 0.000 claims abstract description 3
- 238000000638 solvent extraction Methods 0.000 abstract 1
- 239000000463 material Substances 0.000 description 35
- 238000004519 manufacturing process Methods 0.000 description 7
- 229920000139 polyethylene terephthalate Polymers 0.000 description 4
- 239000005020 polyethylene terephthalate Substances 0.000 description 4
- 244000144730 Amygdalus persica Species 0.000 description 2
- 240000009088 Fragaria x ananassa Species 0.000 description 2
- 235000006040 Prunus persica var persica Nutrition 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 235000021012 strawberries Nutrition 0.000 description 2
- 235000004936 Bromus mango Nutrition 0.000 description 1
- 240000007228 Mangifera indica Species 0.000 description 1
- 235000014826 Mangifera indica Nutrition 0.000 description 1
- 235000009184 Spondias indica Nutrition 0.000 description 1
- 241000219094 Vitaceae Species 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 235000012055 fruits and vegetables Nutrition 0.000 description 1
- 235000021021 grapes Nutrition 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- -1 polyethylene terephthalate Polymers 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000003856 thermoforming Methods 0.000 description 1
- 238000009966 trimming Methods 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
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
- B65D85/00—Containers, packaging elements or packages, specially adapted for particular articles or materials
- B65D85/30—Containers, packaging elements or packages, specially adapted for particular articles or materials for articles particularly sensitive to damage by shock or pressure
- B65D85/34—Containers, packaging elements or packages, specially adapted for particular articles or materials for articles particularly sensitive to damage by shock or pressure for fruit, e.g. apples, oranges or tomatoes
-
- 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
- B65D1/00—Containers having bodies formed in one piece, e.g. by casting metallic material, by moulding plastics, by blowing vitreous material, by throwing ceramic material, by moulding pulped fibrous material, by deep-drawing operations performed on sheet material
- B65D1/22—Boxes or like containers with side walls of substantial depth for enclosing contents
- B65D1/26—Thin-walled containers, e.g. formed by deep-drawing operations
-
- 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
- B65D81/00—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents
- B65D81/02—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents specially adapted to protect contents from mechanical damage
-
- 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
- B29C2791/00—Shaping characteristics in general
- B29C2791/001—Shaping in several steps
-
- 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
- B29C2791/00—Shaping characteristics in general
- B29C2791/004—Shaping under special conditions
- B29C2791/006—Using vacuum
-
- 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
- B29C2791/00—Shaping characteristics in general
- B29C2791/004—Shaping under special conditions
- B29C2791/007—Using fluid under pressure
-
- 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
- B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
- B29C51/08—Deep drawing or matched-mould forming, i.e. using mechanical means only
-
- 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
- B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
- B29C51/10—Forming by pressure difference, e.g. vacuum
-
- 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
- B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
- B29C51/26—Component parts, details or accessories; Auxiliary operations
- B29C51/30—Moulds
- B29C51/36—Moulds specially adapted for vacuum forming, Manufacture thereof
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/712—Containers; Packaging elements or accessories, Packages
- B29L2031/7162—Boxes, cartons, cases
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Ceramic Engineering (AREA)
- Packaging Frangible Articles (AREA)
- Buffer Packaging (AREA)
Abstract
A container 4 formed of a one piece moulding of thermoplastic material comprises a base 28 and an upstanding peripheral sidewall wall or walls 26 having a substantially rigid construction. The base of the container has integrally formed therein a plurality of ribs 25 upstanding in the interior of the base of the container, the ribs being relatively thin and flexible to provide a cushioning effect for the contents of the container. The ribs may include elongate ribs arranged in spaced parallel relationship, partitioning rib(s) or an array of ribs shaped to support a particular type of product. Further, the ribs may comprise at least one set of concentric ribs adapted to receive and locate in the container a large fruit or vegetable; the concentric ribs may increase in height away from the axis to form a shaped shallow cup adapted to cushion and locate a fruit or vegetable.
Description
A container formed from a thermoplastic material The present invention relates a container formed from a thermoplastic material. The invention is particularly, but not exclusively, applicable to containers for storing and displaying food products such as soft fruit and vegetables in supermarkets.
According to the present invention there is provided a. container formed of a one piece moulding of thermoplastic material comprising a base and an upstanding peripheral sidewall wall or walls having a substantially rigid construction, the base of the container having integrally formed therein a plurality of ribs upstanding in the interior of the base of the container, the ribs being relatively thin and flexible to provide a cushioning effect for the contents of the container.
In a preferred embodiment, the plurality of ribs includes elongate ribs arranged in spaced parallel relationship.
In another preferred embodiment, one or two ribs are provided in the base of the container to divide the container into a number of compartments for locating and protecting individual items from damaging each other during transit.
In a further embodiment, the plurality of ribs comprise at least one set of concentric ribs adapted to receive and locate in the container a large fruit or vegetable. In a development of this embodiment, the concentric ribs may increase in height away from the axis of the concentric ribs to form a shaped shallow cup adapted to cushion and locate a fruit or vegetable.
In another preferred embodiment, the ribs are arranged to provide an array of ribs shaped to support a particular type of product The present disclosure also illustrates a method of manufacturing a container from a sheet of thermoplastic material, the container having a base and an upstanding sidewall or walls, the method including a mould shaped to define the exterior profile of the container, warming the sheet of thermoplastic material to a mouldable temperature, and placing the warmed sheet of thermoplastic material over the mould, providing a plug shaped to provide the internal profile of the container and being adapted to be inserted in the mould to clamp the material to define the container therebetween, forming the lower face of the plug with a peripheral groove or rib extending around the periphery of the base adjacent the side wall of the container, the peripheral groove or rib mating with a corresponding peripheral rib or groove, as the case may be, on or in the mould to securely clamp the material of the container between the mould and the plug throughout the moulding process. so that the wall of the container and the base of the container can be subjected to different pressures, forming a lower face of the plug to define the profile of the base of the container, forming a plurality of grooves in the lower face of the plug, applying a vacuum or pressurised air to the insert to draw or press the sheet of material into the grooves therein to form ribs upstanding in the interior of the base of the container, and thereby stretching the material of the ribs to form a thinner material for the ribs thus increasing the flexibility of the ribs to provide a cushioning effect for the contents of the container.
Preferred embodiments of the present invention will now be described with reference to the accompanying figures in which:-Figures 1-7 illustrate a tool for manufacturing a container from a thermo-forming material in seven stages.
Referring now to Figure 1 in particular there is shown a tool for manufacturing a container from a thermo-formable plastics material such as polyethylene terephthalate (PET), the container having a peripheral wall 26 and a base 28 and typically being intended for storing and displaying products such as soft fruit for sale in supermarkets and the like. In a practical application, a bank of six or eight of such tools are arranged in a frame (not shown) to produce six or eight containers simultaneously from a large sheet or film of material 4. The container is thus formed as a one-piece moulding which is shaped and cut from a thermoformable sheet or film of material which in this embodiment comprises PET.
A mould 6 which serves to define the outer shape and dimensions of the container is located in the frame 8. A pressure box 10 is positioned above the mould 6 and has a downwardly extending wall 11 the lower edge 12 of which engages with the frame 8 to provide a substantially airtight seal with the sheet of material 4 trapped therebetween. A plug 14 is located in the pressure box 10, the plug 14 having an interior space 18 connected a to a source of vacuum through a vacuum pipe 16. At its lower face 20, the plug has a recess therein in which is located an insert 22 containing a plurality of grooves 24 which define the profile of the base 28 of the container 2. The inner, rear side of the insert 22 is connected to the space 18 so that the insert 22 and the grooves 24 are subjected to vacuum supplied through the vacuum pipe 16. As a result, the material of the base is drawn into the grooves to form a plurality of ribs 25 in the interior of the base of the container, the ribs being in spaced parallel relationship. The size, positioning and shape of the grooves is determined by the intended application and the type of product, such as strawberries, grapes, peaches et cetera for which the container is intended.
Referring now to Figure 4 and 4a in particular, the plug 14 has a peripheral groove 30 extending around the periphery of its lower face 20 which in the moulding position engages in a rib 32 located in the base of the mould just inwardly of the peripheral wall 26 of the container. The peripheral groove 30 and rib 32 serve to securely clamp the material of the container in position to define and secure the peripheral wall 26 of the container separate from the base. In this way, the wall of the container and the base of the container can then be subjected to different pressures. This not only prevents material from the wall being drawn into the base when the base material is deformed thereby to maintain the rigid strength required for the wall but enables the material of the base to be stretched into the grooves to form a thinner material for the base in these areas thus increasing the flexibility and cushioning effect of the ribs formed in the base of the container. In an alternative embodiment (not shown) the rib 32 is located on the lower face of the plug and the groove 30 is formed in the base of the mould. In an alternative embodiment (not shown) there is no insert and the plug is formed of a metal such as aluminium and the grooves are machined in the lower face of the plug. In an alternative embodiment in which a peripheral rib is formed on the plug, the material of the plug is machined away to leave the peripheral rib standing proud of the remainder of the lower face of the plug.
As shown in Figure 2, the pressure box 10 is closed to trap the sheet material 4 between the frame 8 and the lower edge 12 of the pressure box 10. Thereafter, as shown in Figure 5, air pressure is fed to the space 34 between the pressure box and the plug 12, which urges the plug downwardly until the plug presses the material 4 down until it contacts the base of the mould as shown in Figure 4. In this position, the sheet material is urged by the rib 32 into the groove 30 where it is clamped securely in position. In this way, the material defining the wall 26 of the container is clamped securely in position so that when further moulding takes place on the material at the base of the plug, the material defining the wall 26 of the container cannot flow into the base 28 of the container 2. Turning now to Figure 6, in this stage of the manufacture, a vacuum is applied through the vacuum pipe 16 to the interior of the plug 12 and the vacuum thus draws the material of the base of the container into the grooves 24 to form ribs 25 upstanding in the base of the container. As a consequence, the material of the base 28 of the container 2 is greatly thinned. In this way, the wall of the container remains a relatively thick and rigid material but the material of the ribs 25 in the base 28 of the container are relatively thin and flexible. In this way, the ribs form a cushion to protect, for example, soft fruit such as strawberries during storage and transportation without the necessity of having to insert a cushioning material such as a layer of foamed material, fabric, bubblewrap or the like in the base of the container. This has the great advantage that containers in accordance with the present disclosure are formed entirely of the one single PET material which greatly facilitates recycling of the container after use. A further advantage is that the additional manufacturing steps currently used of supplying a layer of protective material in the base of the container and gluing it in position are eliminated, which lowers production cost. In an alternative embodiment, instead of using a vacuum to urge the material into engagement with the insert, air pressure could be applied to the underside of the material to urge the material up into the grooves in the insert. The temperature of the air pressure may be adjusted to ensure that the base of the container remains sufficiently flexible to ensure that the material is drawn or pressed completely into the grooves.
Turning now to Figure 7, the final stage of manufacturing the container is shown. The pressure box 10 is withdrawn, with the plug 14 and a quick blast of release air is applied to the underside of the mould through air supply openings 36 to release the container from the mould 6, from where it passes to a trimming station where the edge of the container walls are trimmed to a desired finished state. The temperature of the release air is low enough such that it does not affect or distort the shape of the moulded parts of the container.
The embodiment described provides a cushioning effect to products stored in the container but in alternative embodiments just one or two ribs could be provided in the base of the container to divide the container into a number of compartments for locating and protecting individual items such as mangoes from damaging each other during transit. In another form, the base of the container may be formed with at least one set of concentric ribs adapted to receive and locate in the container a larger fruit such as a peach. The concentric ribs may increase in height away from the axis of the concentric ribs to form a shaped shallow cup adapted to cushion and locate a larger fruit, for example.
In another preferred embodiment, the ribs are arranged to provide an array of ribs shaped to support a particular type of product.
Claims (6)
- CLAIMS1. A container formed of a one piece moulding of thermoplastic material comprising a base and an upstanding peripheral sidewall wall or walls having a substantially rigid construction, the base of the container having formed integrally therein a plurality of ribs upstanding in the interior of the base of the container, the ribs being relatively thin and flexible to provide a cushioning effect for the contents of the container.
- 2. A container according to claim 1, wherein the plurality of ribs includes elongate ribs arranged in spaced parallel relationship
- 3. A container according to claim 1 or 2, wherein one or two ribs are provided in the base of the container to divide the container into a number of compartments for locating and protecting individual items from damaging each other during transit.
- 4. A container according any one of the preceding claims, wherein the ribs are arranged to provide an array of ribs shaped to support a particular type of product.
- 5. A container according to any one of the preceding claims wherein the plurality of ribs comprise at least one set of concentric ribs adapted to receive and locate in the container a large fruit or vegetable.
- 6. A container according to claim 5 wherein the concentric ribs increase in height away from the axis of the concentric ribs to form a shaped shallow cup adapted to cushion and locate a fruit or vegetable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2102741.2A GB2599178B (en) | 2019-01-24 | 2019-01-24 | A container formed from a thermoplastic material |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2102741.2A GB2599178B (en) | 2019-01-24 | 2019-01-24 | A container formed from a thermoplastic material |
| GB1900964.6A GB2580685B (en) | 2019-01-24 | 2019-01-24 | A method and tool for manufacturing a container from a thermoplastic material |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB202102741D0 GB202102741D0 (en) | 2021-04-14 |
| GB2599178A true GB2599178A (en) | 2022-03-30 |
| GB2599178B GB2599178B (en) | 2023-11-22 |
Family
ID=80468950
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2102741.2A Active GB2599178B (en) | 2019-01-24 | 2019-01-24 | A container formed from a thermoplastic material |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2599178B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55161881A (en) * | 1979-06-05 | 1980-12-16 | Mitsubishi Electric Corp | Production of phosphor |
| US4696401A (en) * | 1985-06-13 | 1987-09-29 | Robert S. Wallace | Cushioning packaging media |
| JPH06171679A (en) * | 1993-02-05 | 1994-06-21 | Mitsuhiro Takahashi | Cherry pack |
| US5954203A (en) * | 1997-12-24 | 1999-09-21 | Allegiance Corporation | Packaging container |
| WO2004080818A2 (en) * | 2003-03-12 | 2004-09-23 | Hbv Innova Ag | Receptacle for fragile items, particularly fruit and vegetables |
| EP1544129A1 (en) * | 2003-10-15 | 2005-06-22 | Cryovac, Inc. | Thermoformed plastic container and method for its manufacture |
| WO2015112002A1 (en) * | 2014-01-21 | 2015-07-30 | Multitray B.V. | Box-shaped plastic fruit container |
-
2019
- 2019-01-24 GB GB2102741.2A patent/GB2599178B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55161881A (en) * | 1979-06-05 | 1980-12-16 | Mitsubishi Electric Corp | Production of phosphor |
| US4696401A (en) * | 1985-06-13 | 1987-09-29 | Robert S. Wallace | Cushioning packaging media |
| JPH06171679A (en) * | 1993-02-05 | 1994-06-21 | Mitsuhiro Takahashi | Cherry pack |
| US5954203A (en) * | 1997-12-24 | 1999-09-21 | Allegiance Corporation | Packaging container |
| WO2004080818A2 (en) * | 2003-03-12 | 2004-09-23 | Hbv Innova Ag | Receptacle for fragile items, particularly fruit and vegetables |
| EP1544129A1 (en) * | 2003-10-15 | 2005-06-22 | Cryovac, Inc. | Thermoformed plastic container and method for its manufacture |
| WO2015112002A1 (en) * | 2014-01-21 | 2015-07-30 | Multitray B.V. | Box-shaped plastic fruit container |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2599178B (en) | 2023-11-22 |
| GB202102741D0 (en) | 2021-04-14 |
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