GB2108890A - Container having a light transmissive region - Google Patents

Container having a light transmissive region Download PDF

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Publication number
GB2108890A
GB2108890A GB08130102A GB8130102A GB2108890A GB 2108890 A GB2108890 A GB 2108890A GB 08130102 A GB08130102 A GB 08130102A GB 8130102 A GB8130102 A GB 8130102A GB 2108890 A GB2108890 A GB 2108890A
Authority
GB
United Kingdom
Prior art keywords
light transmissive
container
layer
relatively opaque
bulge
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
Application number
GB08130102A
Other versions
GB2108890B (en
Inventor
Earle Ryan Duffin
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.)
FLEXTANK Ltd
Original Assignee
FLEXTANK Ltd
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 FLEXTANK Ltd filed Critical FLEXTANK Ltd
Priority to GB08130102A priority Critical patent/GB2108890B/en
Publication of GB2108890A publication Critical patent/GB2108890A/en
Application granted granted Critical
Publication of GB2108890B publication Critical patent/GB2108890B/en
Expired legal-status Critical Current

Links

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
    • B65D25/00—Details of other kinds or types of rigid or semi-rigid containers
    • B65D25/54—Inspection openings or windows
    • 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
    • B29C37/00—Component parts, details, accessories or auxiliary operations, not covered by group B29C33/00 or B29C35/00
    • B29C37/0053—Moulding articles characterised by the shape of the surface, e.g. ribs, high polish
    • 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
    • B29C69/00—Combinations of shaping techniques not provided for in a single one of main groups B29C39/00 - B29C67/00, e.g. associations of moulding and joining techniques; Apparatus therefore
    • B29C69/001—Combinations of shaping techniques not provided for in a single one of main groups B29C39/00 - B29C67/00, e.g. associations of moulding and joining techniques; Apparatus therefore a shaping technique combined with cutting, e.g. in parts or slices combined with rearranging and joining the cut parts
    • 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
    • B29C2793/00—Shaping techniques involving a cutting or machining operation
    • B29C2793/009—Shaping techniques involving a cutting or machining operation after shaping
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/001—Combinations of extrusion moulding with other shaping operations
    • B29C48/0011—Combinations of extrusion moulding with other shaping operations combined with compression moulding
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/12—Articles with an irregular circumference when viewed in cross-section, e.g. window profiles
    • 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
    • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0018—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds having particular optical properties, e.g. fluorescent or phosphorescent
    • B29K2995/0025—Opaque
    • 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
    • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0018—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds having particular optical properties, e.g. fluorescent or phosphorescent
    • B29K2995/0026—Transparent
    • 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
    • B29L2009/00—Layered products
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Containers Having Bodies Formed In One Piece (AREA)

Abstract

A method is described of manufacturing a container having a light transmissive region therein to provide a visible indication of the contents of the container. The preferred method utilises a mould (1) having an indent (3) in the mould wall which receives relatively opaque (4) and light transmissive (5) layers of plastics material. This results in a bulge or ridge (7) in the container wall. The bulge or ridge is then machined to remove the corresponding region of relatively opaque material, thereby revealing a region of the underlying light transmissive material, Fig. 2 (not shown). <IMAGE>

Description

SPECIFICATION Container having light transmissive region This invention relates to a method of manufacturing a container having a transmissive region therein to provide a visible indication of the contents of the container.
UK Patent Specification No. 1157439 describes a container having a light transmissive band to enable a liquid level inside the container to be readily seen. The container was produced by moulding a layer of opaque plastics material in a suitable mould. A section of the mould was removed, together with a band of the opaque plastics material, and replaced by a fresh piece of mould without the opaque plastics material. A fresh charge of light transmissive plastics material was then inserted into the mould and the moulding process was continued to build-up the thickness of the container wall. This resulted in a container having a light transmissive band therein.
However, this process has the disadvantage of leaving a long split down the side of the mould, considerably weakening its construction.
To avoid the latter disadvantage, one proposal has been to produce containers by a similar technique but having only short strips or bands which are staggered down the side of the container. For example, the container may have a series of oval vertical patches in its side wall.
However, it is a more time-consuming process to produce such patches and hence the cost of manufacture can be thereby increased.
The present invention seeks to overcome the latter mentioned disadvantages.
The invention provides a method of manufacturing a container having a light transmissive wall portion or portions therein to provide a visible indication of the contents of the container, the method comprising the steps of: (a) forming the container such that a portion of its wall, which is made of overlying layers of relatively opaque and light transmissive material, bulges away from said wall, the relatively opaque layer being external to the light transmissive layer, with respect to the direction of the bulge, and (b) removing the relatively opaque layer of material, in the region of the bulge, to reveal the light transmissive layer.
In the above method, there is no need to remove a section of the mould and/or a corresponding section of the container wall to provide a light transmissive region.
Preferably, the method is applied in a moulding process to provide the advantage of a continuous moulding technique. In the latter case, a continuous light transmissive band can be provided in the wall of the container, without weakening the construction of the mould, and the continuous band is clearly more advantageous, than a series of light transmissive patches, for inspecting the container contents.
The invention also provides a method of manufacturing a container having a light transmissive band therein to provide a visible indication of the contents of the container the method comprising the steps of: (a) providing a mould having a shape for forming a container, said mould having an indent in a wall portion thereof, (b) applying material to the mould to provide overlying relatively opaque and light transmissive layers, said layers forming a bulge at said indent with the opaque layer external to the light transmissive layer, with respect to the direction of the bulge, and (c) removing the relatively opaque layer, in the region of the bulge, to reveal the light transmissive layer thereby to form said light transmissive band.
The invention further provides a container having a light transmissive wall portion or portions therein, the container wall or walls having an outer layer of relatively opaque material and an inner layer of light transmissive material, the light transmissive wall portion or portions being provided by a region of the light transmissive layer which bulges through the relatively opaque layer to a major surface thereof and which has been revealed by removal of the relatively opaque material.
Although the preferred method is applied to a moulding technique, it is clearly apparent that the invention may be applied to other techniques wherein a container has a wall portion or portions formed by overlying layers of relatively opaque and light transmissive material.
An example of the invention will now be described with reference to the accompanying drawings, in which: Fig. 1 illustrates a section through the wall portion of a container in a mould, and Fig. 2 illustrates the same wall portion, removed from the mould, and having a region of an opaque layer removed to reveal a light transmissive layer.
As the technique of moulding containers with plastics material, e.g. polythene, is well known in the art, it will not be described in detail.
Referring to Fig. 1, this illustrates a section through a portion of a mould 1 and a wall 2 of a container formed in the mould. The mould has an indent 3 which preferably extends along the axial length of, e.g. a generally cylindrical mould for producing a cylindrical container. The wall 2 of the container is made of overlying layers 4, 5 of relatively opaque and light transmissive material respectively. For example, layer 4 is made of black polythene and layer 5 is made of natural polythene.
In the moulding process, the thinner layer 4 of plastics material is first applied to the mould 1, whereby it forms a layer which extends into the indent 3. Subsequently, the thicker layer 5 of plastics material is built-up to provide a desired wall thickness for the container. Layer 5 extends into an indent 6 which is correspondingly formed in the underside of the opaque layer 4. The wall 2 of the container is thereby provided with a bulge or ridge 7. After the plastics material has set, the light transmissive layer is uncovered in the region of the bulge or ridge 7 as described below.
Fig. 2 illustrates the same wall portion 2 of the container, when removed from the mould 1, and after the bulge or ridge 7 has been machined away, for example, to a point immediately above the major surface of layer 4. This machining reveals the underlying layer of light transmissive plastics material 5, whereby a light transmissive region or band is provided in the wall of the container.
Preferably, the depth of the indent 3 in the mould 1 and the thickness of the opaque layer 4 is such that the indent 6 is formed to receive the part of the layer 5, whereby the opaque layer can be removed by machining to just above the surface of layer 4. Otherwise it would be necessary to machine below the surface of layer 4 to reveal the light transmissive layer 5.
Clearly, the indents which are provided in the mould 1 may be of different shapes and sizes, for example, they may be provided in the form of a continuous ridge, or a series of discontinuous depressions.
The preferred moulding process is a rotational moulding technique, but a blow moulding technique could also be used. Generally speaking, the preferred moulding process is one in which two dissimilar coloured walls can be superimposed on one another. Usually, one wall is made of opaque material (e.g. containing a proportion of carbon black) to absorb ultraviolet radiation to prevent any degradation of the plastics material. However, it would be possible, if required, to use a relatively opaque material (which might transmit some light) compared with a light transmissive or translucent material (like natural polythene).

Claims (10)

1. A method of manufacturing a container having a light transmissive wall portion or portions therein to provide a visible indication of the contents of the container, the method comprising the steps of: (a) forming the container such that a portion of its wall, which is made of overlying layers of relatively opaque and light transmissive material, bulges away from said wall, the relatively opaque layer being external to the light transmissive layer, with respect to the direction of the bulge, and (b) removing the relatively opaque layer of material, in the region of the bulge, to reveal the light transmissive layer.
2. A method according to claim 1 wherein the bulge is in the form of a ridge to provide a light transmissive band in said container.
3. A method according to claim 1 or 2 in which the container is formed by a moulding technique wherein the relatively opaque and light transmissive layers are applied to a mould having an indent therein for forming said bulge.
4. A method of manufacturing a container having a light transmissive band therein to provide a visible indication of the contents of the container, the method comprising the steps of: (a) providing a mould having a shape for forming a container, said mould having an indent in a wall portion thereof, (b) applying material to the mould to provide overlying relatively opaque and light transmissive layers, said layers forming a bulge at said indent with the relatively opaque layer external to the light transmissive layer, with respect to the direction of the bulge, and (c) removing the relatively opaque layer, in the region of the bulge, to reveal the light transmissive layer thereby to form said light transmissive band.
5. A method according to claim 4, wherein the depth of the indent and the thickness of the relatively opaque layer are such that an indent is formed in the relatively opaque layer, the latter indent extending beyond the major surface of the relatively opaque layer, whereby the light transmissive layer also extends beyond said major surface of the relatively opaque layer, said light transmissive band being formed by removing the relatively opaque layer, in the region of the bulge, to a point immediately above the major surface of the relatively opaque layer.
6. A method according to any one of the preceding claims wherein the step of removing the relatively opaque layer is carried out by machining the bulge to reveal the light transmissive layer.
7. A method according to claim 1 and substantially as herein described.
8. A container made according to the method of any one of claims 1-7.
9. A container having a light transmissive wall portion or portions therein, the container wall or walls having an outer layer of relatively opaque material and an inner layer of light transmissive material, the light transmissive wall portion or portions being provided by a region of the light transmissive layer which bulges through the relatively opaque layer to a major surface thereof and which has been revealed by removal of the relatively opaque material.
10. A container according to claim 9 and substantially as herein described with reference to the accompanying drawings.
GB08130102A 1981-10-06 1981-10-06 Container having a light transmissive region Expired GB2108890B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB08130102A GB2108890B (en) 1981-10-06 1981-10-06 Container having a light transmissive region

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB08130102A GB2108890B (en) 1981-10-06 1981-10-06 Container having a light transmissive region

Publications (2)

Publication Number Publication Date
GB2108890A true GB2108890A (en) 1983-05-25
GB2108890B GB2108890B (en) 1985-06-05

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ID=10524972

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08130102A Expired GB2108890B (en) 1981-10-06 1981-10-06 Container having a light transmissive region

Country Status (1)

Country Link
GB (1) GB2108890B (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2139940A (en) * 1983-05-18 1984-11-21 Bata Ind Ltd Method of moulding a footwear sole
EP0171769A2 (en) * 1984-08-13 1986-02-19 TERUMO KABUSHIKI KAISHA trading as TERUMO CORPORATION Clinical electrothermometer
EP0180951A2 (en) * 1984-11-06 1986-05-14 TERUMO KABUSHIKI KAISHA trading as TERUMO CORPORATION Electronic clinical thermometer
GB2255324A (en) * 1991-04-08 1992-11-04 Colgate Palmolive Co Squeeze-to-empty tube with viewing window
EP1339097A2 (en) * 1999-04-20 2003-08-27 Shin-Etsu Polymer Co., Ltd. Wafer container box

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2139940A (en) * 1983-05-18 1984-11-21 Bata Ind Ltd Method of moulding a footwear sole
EP0171769A2 (en) * 1984-08-13 1986-02-19 TERUMO KABUSHIKI KAISHA trading as TERUMO CORPORATION Clinical electrothermometer
EP0171769A3 (en) * 1984-08-13 1987-06-10 Terumo Kabushiki Kaisha Trading As Terumo Corporation Clinical electrothermometer
US4743121A (en) * 1984-08-13 1988-05-10 Terumo Kabushiki Kaisha Clinical electrothermometer
EP0180951A2 (en) * 1984-11-06 1986-05-14 TERUMO KABUSHIKI KAISHA trading as TERUMO CORPORATION Electronic clinical thermometer
EP0180951A3 (en) * 1984-11-06 1987-06-16 Terumo Kabushiki Kaisha Trading As Terumo Corporation Electronic clinical thermometer
US4729672A (en) * 1984-11-06 1988-03-08 Terumo Kabushiki Kaisha Electronic clinical thermometer
GB2255324A (en) * 1991-04-08 1992-11-04 Colgate Palmolive Co Squeeze-to-empty tube with viewing window
GB2255324B (en) * 1991-04-08 1995-10-04 Colgate Palmolive Co Tube dispenser
EP1339097A2 (en) * 1999-04-20 2003-08-27 Shin-Etsu Polymer Co., Ltd. Wafer container box
EP1339097B1 (en) * 1999-04-20 2006-06-21 Shin-Etsu Polymer Co., Ltd. Wafer container box

Also Published As

Publication number Publication date
GB2108890B (en) 1985-06-05

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PCNP Patent ceased through non-payment of renewal fee