GB2267677A - Rotational moulding of multi-coloured articles - Google Patents

Rotational moulding of multi-coloured articles Download PDF

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Publication number
GB2267677A
GB2267677A GB9212376A GB9212376A GB2267677A GB 2267677 A GB2267677 A GB 2267677A GB 9212376 A GB9212376 A GB 9212376A GB 9212376 A GB9212376 A GB 9212376A GB 2267677 A GB2267677 A GB 2267677A
Authority
GB
United Kingdom
Prior art keywords
moulding
shell
mould
colour
article
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
GB9212376A
Other versions
GB2267677B (en
GB9212376D0 (en
Inventor
Peter Godfrey Knowles
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.)
ROTATIONAL MOULDINGS Ltd
Original Assignee
ROTATIONAL MOULDINGS 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 ROTATIONAL MOULDINGS Ltd filed Critical ROTATIONAL MOULDINGS Ltd
Priority to GB9212376A priority Critical patent/GB2267677B/en
Publication of GB9212376D0 publication Critical patent/GB9212376D0/en
Publication of GB2267677A publication Critical patent/GB2267677A/en
Application granted granted Critical
Publication of GB2267677B publication Critical patent/GB2267677B/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
    • B29C41/02—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor for making articles of definite length, i.e. discrete articles
    • B29C41/04—Rotational or centrifugal casting, i.e. coating the inside of a mould by rotating the mould
    • 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
    • B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
    • B29C41/02—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor for making articles of definite length, i.e. discrete articles
    • B29C41/18—Slush casting, i.e. pouring moulding material into a hollow mould with excess material being poured off

Abstract

A method of making a rotationally moulded article comprises the steps of forming a shell-like moulding 14 of plastics material of one colour, placing this shell-like moulding within a mould 10, 21 to be used in a rotational moulding operation, and moulding the rest of the article using a differently coloured plastics material 23. The shell-like moulding 14 forms part of the outer surface of the finished article 24. The shell-like moulding may be formed by dump-moulding and the mould used for this may form part of the rotational mould. <IMAGE>

Description

MOULDED ARTICLE AND METHOD This invention concerns an article largely formed by a rotational moulding technique and method for making same.
Many large mouldings, such as litter bins and other street furniture", for example, are generally made by a rotational moulding technique on account of the relative low cost of the mould - in that it is in the form of an empty box, or whatever shape.
Sometimes it is desired to make an article, such as a litter bin, having parts of different colour. With rotationally moulded articles, this has ordinarily been achieved by overlaying the outer surface of an article moulded from a plastics material of one colour with a thin layer of different colour, either during or after the moulding operation. In any event, such layer is prone to wear, and the article has limited life - in its original and intended livery.
It is an object of the present invention to provide a moulded article and method for making same by a rotational moulding technique, which overcomes, at least to some extent, the problem aforesaid.
According to the present invention there is provided a method of making a rotationally moulded article comprising the steps of forming a shell-like moulding of plastics material of one colour, placing said shell-like moulding within a mould to be used in a rotational moulding operation so as to form part of the outer surface of the rotationally moulded article formed therein with a plastics material of different colour.
The shell-like moulding of one colour may be formed by a dump-moulding technique.
The invention includes articles manufactured by the method aforesaid.
The invention will be further apparent from the following description, with reference to the figures of the accompanying drawing, which show, by way of example only, the sequential stages in producing a moulding in accordance with the method of the invention.
Figure 1 shows an open-topped bowl shaped first mould part 10 having an outwardly extending flange 11 around its upper rim.
The mould part 10 is filled with a powdered plastics material 12, such as polyethylene, of a certain colour and its external surface is heated by flame indicated at 13 in Figure 2 to cause a layer of the material 12 to fuse and form a skin 14 of desired depth over the internal surface of the mould part 10.
The mould part 10 is then removed from the flame 13 and the unfused filling 12 is poured therefrom as shown in Figure 3. This is known as dump-moulding.
The mould part 10 with its contained skin 14 is then joined with a second mould part 20 having an outwardly extending flange 21 which mates with and is clamped to the flange 11 to form a box-like enclosure 22 (see Figure 4) into which a charge 23 of thermoplastics powder, such as of polyethylene, of a different colour is introduced.
The mould 22 is then positioned on a rotational moulding machine to cause the charge to be distributed over the internal surface of the mould part 20 and skin 14 and fused to form a further skin 24. The mould is opened to reveal an article having a portion of one colour adjacent a portion of a second colour as shown in Figure 5.
The joint 25 between the parts of different colour is a well-defined line acceptably clear for most applications.
It will be appreciated that it is not intended to limit the invention to the above example only, many variations, such as might readily occur to one skilled in the art, being possible, without departing from the scope thereof.

Claims (4)

1. A method of making a rotationally moulded article comprising the steps of forming a shell-like moulding of plastics material of one colour, placing said shell-like moulding within a mould to be used in a rotational moulding operation so as to form part of the outer surface of the rotationally moulded article formed therein with a plastics material of different colour.
2. A method according to claim 1, wherein the shell-like moulding of one colour is formed by a dump-moulding technique.
3. A method according to either claim 1 or claim 2, wherein the mould in which the shell-like moulding of one colour is formed itself forms part of the mould in which the rotationally moulded article is formed.
4. An article manufactured by any of the methods of claims 1-3.
GB9212376A 1992-06-11 1992-06-11 Moulded article and method Expired - Lifetime GB2267677B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9212376A GB2267677B (en) 1992-06-11 1992-06-11 Moulded article and method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9212376A GB2267677B (en) 1992-06-11 1992-06-11 Moulded article and method

Publications (3)

Publication Number Publication Date
GB9212376D0 GB9212376D0 (en) 1992-07-22
GB2267677A true GB2267677A (en) 1993-12-15
GB2267677B GB2267677B (en) 1995-10-25

Family

ID=10716912

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9212376A Expired - Lifetime GB2267677B (en) 1992-06-11 1992-06-11 Moulded article and method

Country Status (1)

Country Link
GB (1) GB2267677B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6126881A (en) * 1998-12-24 2000-10-03 Riva Sports, Llc Rotomolding process to form a product having multiple colors in a non-random, sequentially segregated and controlled patterns

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1140384A (en) * 1966-04-01 1969-01-15 Louis Herbert Barnett Moulding mechanism and method
EP0299943A1 (en) * 1987-07-13 1989-01-18 Italo-Suisse A mould for manufacturing chocolate objects having at least two different colors, and a method to be applied therewith

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0411214A1 (en) * 1989-07-04 1991-02-06 Sunrex Industry Co., Ltd Fluororesin rotation molded articles and process for preparing same
GB2267675B (en) * 1992-05-21 1995-09-20 Nanma Mfg Co Ltd Rotational moulding process and product

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1140384A (en) * 1966-04-01 1969-01-15 Louis Herbert Barnett Moulding mechanism and method
EP0299943A1 (en) * 1987-07-13 1989-01-18 Italo-Suisse A mould for manufacturing chocolate objects having at least two different colors, and a method to be applied therewith

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6126881A (en) * 1998-12-24 2000-10-03 Riva Sports, Llc Rotomolding process to form a product having multiple colors in a non-random, sequentially segregated and controlled patterns

Also Published As

Publication number Publication date
GB2267677B (en) 1995-10-25
GB9212376D0 (en) 1992-07-22

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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)
PE20 Patent expired after termination of 20 years

Expiry date: 20120610