GB2078598A - Moulding Articles Formed of Conjoined Portions - Google Patents
Moulding Articles Formed of Conjoined Portions Download PDFInfo
- Publication number
- GB2078598A GB2078598A GB8021884A GB8021884A GB2078598A GB 2078598 A GB2078598 A GB 2078598A GB 8021884 A GB8021884 A GB 8021884A GB 8021884 A GB8021884 A GB 8021884A GB 2078598 A GB2078598 A GB 2078598A
- Authority
- GB
- United Kingdom
- Prior art keywords
- mould
- portions
- article
- cavity
- conjoined
- 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
- B29C39/00—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor
- B29C39/02—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor for making articles of definite length, i.e. discrete articles
- B29C39/021—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor for making articles of definite length, i.e. discrete articles by casting 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
- B29C37/00—Component parts, details, accessories or auxiliary operations, not covered by group B29C33/00 or B29C35/00
- B29C37/02—Deburring or deflashing
-
- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C45/14778—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles the article consisting of a material with particular properties, e.g. porous, brittle
-
- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/16—Making multilayered or multicoloured articles
-
- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/16—Making multilayered or multicoloured articles
- B29C45/1671—Making multilayered or multicoloured articles with an insert
-
- 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
- B29K2075/00—Use of PU, i.e. polyureas or polyurethanes or derivatives thereof, as moulding material
-
- 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
- B29L2031/54—Balls
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Professional, Industrial, Or Sporting Protective Garments (AREA)
Abstract
A moulded article e.g. a sports ball is produced by initially moulding a first portion (2) in a mould cavity (16) Fig. 2 (not shown). A piece of porous sheet material may be moulded to the first portion in the cavity (16) and then the portion (2) is located in a recess (26) of a mould member (24) which is moved into cooperation with a further mould member (14) whose cavity (16) is closed by the surface (8) of the porous sheet and the second portion of the article is moulded in the cavity (16) so as to adhere firmly to the first portion (2). The article is then removed from the mould arrangement and the marginal portions (12) of the porous sheet are trimmed in a fettling step. <IMAGE>
Description
SPECIFICATION Improvements In or Relating To the Moulding
of Articles a
The invention is concerned with improvements
in or relating to the moulding of articles formed
from two conjoined portions. For example, it may
be found applicable to the manufacture of sports
balls from synthetic plastics materials.
It is often found inconvenient to attempt to
mould a compact solid object from synthetic
plastics material in a single moulding operation,
principally because of problems associated with
incorrect distribution of material in the
corresponding mould cavity and resultant voids in
the product. Sports balls are examples of products
which because of their compact configuration are
particularly prone to the formation of voids.
The invention therefore proposes the use of a
method of producing moulded articles formed
from at least two conjoined portions, comprising
the steps of procuring a mould member having a
mould cavity with a configuration corresponding
to a first of said article portions, closing the mould
cavity and forming said first portion, and then
forming in a second mould cavity the second
portion of the article one wall of said second
mould cavity being defined by a flat surface of the
first article portion.
Under certain circumstances, however, this
solution may present problems not only of
adherence between the two portions, but also
connected with the precise alignment of the first
portion with the mould cavity for the second
portion. Where two-stage moulding process is to
be applied to the production of for instance
cricket-balls, very close tolerances must be
observed, if the products are to be acceptable
substitutes for conventional leather cricket balls,
in respect of dimensions, overall weight and its
distribution within the ball, and precision of
alignment of the component portions.
The invention therefore also provides a method
of producing moulded articles formed from at
least two conjoined portions, comprising the
following steps; procuring a mould member
provided with a mould cavity having a
configuration corresponding to a first of said
article portions, placing over the open cavity a
sheet of rigid or semi-rigid porous material,
closing the cavity with a mould closing plate
member so as to trap marginal portions of said
sheet, moulding said first portion of the article in
the closed cavity so that the moulding material -enters and keys into interstices of the porous
sheet material, procuring a further mould member -provided with a mould cavity having a
configuration corresponding to a second of said
article portions, supplying moulding material to
the mould cavity of the further mould member so
as as to form a second portion of the article when
the cavity of the further mould member is closed
by the presence of the first moulded portion of the
article clamped thereagainst by suitable clamping
means, so that the marginal portions of the sheet material are trapped between the further mould member and the clamping means, and thereafter trimming said marginal portions of the material from the moulded product.
In the example already mentioned, that is, the production of moulded sports balls such as a cricket ball, the first portion of the ball to be moulded corresponds to one half of the article, the second portion, corresponding to the other half, being moulded thereon to form a spherical shape with the mould parting line arranged to be aligned with a simulated seam formed on the ball.
The presence of the trimmed porous sheet material in the finished article is thus virtually undetectable visually.
The porous sheet material may be of any suitable material which has a sufficient degree of rigidity so that marginal portions extend stiffly from the first moulded portion to act as handling means to facilitate handling and location of the first portion with relation to the mould cavity for the second portion. The porous of the material should preferably be sufficient to allow the moulding material of the ball, for example polyurethane, thoroughly to penetrate the interstices of the sheet material so as to embed the sheet material firmly.
There will now be described an example of the production of a sports ball according to the invention. It will be understood that the description, which is to be read with reference to the drawings, is given by way of example only and not by way of limitation.
In the drawings~ Figure 1 is a perspective view of a first portion of the article at an intermediate stage in the method according to the invention;
Figure 2 is sectional view through a first mould member containing the first article portion of
Figure 1; and
Figure 3 is a sectional view through a further mould member and a clamping means.
Figures 1 and 2 show a first portion 2 of a cricket ball, moulded from polyurethane and having a hemispherical configuration, the curved surface 4 of which is provided with a simulated seam 6. The portion 2 has a flat surface 8 in which is embedded a central portion of a piece of semi-rigid porous sheet material 10, marginal portions 12 of which extendly stiffly from the ball portion (Figure 1). The portion 2 is formed in a mould arrangement as shown in Figure 2, comprising a first member 14 having a cavity 16 corresponding to the configuration of the ball portion 2. The cavity 16 is closed firstly by inserting the piece of semi-rigid porous sheet material 10 and then by positioning a mould closing plate member 18.The size of the sheet material is chosen to provide marginal portions 12 which are wide enough for ease of handling as will be hereinafter explained, and to permit trapping thereof between the mould member especially in the vicinity of locating peg-andsocket arrangement 20 conventionally provided on confronting mould surfaces. In the present example the sheet material measures approximately 1 00x 120 mm, suitable for use in moulding a cricket ball, the diameter of which must be 72.5 mm to comply with the appropriate regulations. The material used in the example is a polyester inter-lining having a random fibre arrangement, but it will be understood that a variety of non-impervious sheeting materials may be suitable, in either felted, woven or net form.
When the first portion is removed from the mould member 14, it will be observed that the surface 8 is generally flat, with few or none of the fibres of the material 10 being visible within the circumference of the portion 2. Polyurethane flash 22 forms around the surface 8 and will be trimmmed off when the marginal portions 12 of the material 10 are removed.
The first portion 2 is then received in clamping means which in the present example is a mould member 24 having a recess 26 into which fits the hemispherical surface 4. The member 24 is provided with pegs of the peg-and-socket locating means 20 and the marginal portions 12 of the material 10 are forced over these pegs to assist in maintaining accurate alignment of the portion 2 with a cavity in a further mould member. In the present example the further mould member is identical with the mould member 14 and will be referred to as such. Figure 3 therefore shows the clamped portion 2 being lowered into a position confronting the mould member 14 so that when the cavity 16 is closed by the surface 8, the second portion of the ball is moulded so as to adhere firmly to the first portion and in accurate alignment therewith.
The ball is then removed from the moulding arrangement and the flash 22 and the marginal portions 10 are neatly trimmed in a fettling step.
Various modifications may be made within the scope of the invention.
Claims (7)
1. A method of producing moulded articles formed from at least two conjoined portions, comprising the steps of procuring a mould member having a mould cavity with a configuration corresponding to a first of said article portions, closing the mould cavity and forming said first portion, and then forming a second mould cavity the second portion of the article one wall of said second mould cavity being defined by a flat surface of the first article portion.
2. A method of producing moulded articles.
formed from at least two conjoined portions, comprising the following steps; procuring a mould member provided with a mould cavity having q configuration corresponding to a first of said article portions, placing over the open cavity a sheet of rigid or semi-rigid porous material, closing the cavity with a mould closing plate member so as to trap marginal portions of said sheet, moulding said first portion of the article in the closed cavity so that moulding material enters and keys into interstices of the porous sheet material, procuring a further mould member provided with a mould cavity having a configuration corresponding to a second of said article portions, supplying moulding material to the mould cavity of the further mould member so as to form a second portion of the article when the cavity of the further mould member is closed by the presence of the first moulded portion of the article clamped thereagainst by suitable clamping means, so that the marginal portions of the sheet material are trapped between the further mould member and the clamping means, and thereafter trimming said marginal portions of the material from the moulded product.
3. A method as claimed in claim 2 wherein location pins are provided on confronting surfaces of the two mould members used in the formation of the second portion of the article and are adapted to penetrate the marginal portions of the sheet material.
4. A method as claimed in claim 3 wherein the sheet material is porous and sufficiently stiff to facilitate handling.
5. A sports ball produced by the method according to claim 2, comprising two hemispherical portions and including between said portions a flat circular sheet of porous material lying in the plane of an annular simulated stitched seam.
6. A method of producing moulded articles formed from at least two conjoined portions substantially as hereinbefore described with reference to and as shown in the drawings.
7. A sports ball formed from two conjoined hemispherical portions, constructed substantially as hereinbefore described with reference to and as shown in the drawings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8021884A GB2078598B (en) | 1980-07-03 | 1980-07-03 | Moulding articles formed of conjoined portions |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8021884A GB2078598B (en) | 1980-07-03 | 1980-07-03 | Moulding articles formed of conjoined portions |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2078598A true GB2078598A (en) | 1982-01-13 |
| GB2078598B GB2078598B (en) | 1984-01-04 |
Family
ID=10514525
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8021884A Expired GB2078598B (en) | 1980-07-03 | 1980-07-03 | Moulding articles formed of conjoined portions |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2078598B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2626810A1 (en) * | 1988-02-08 | 1989-08-11 | Ryo Catteau Sa Ste Nle Ets | METHOD OF MARKING THE SURFACE OF OBJECTS, MEANS FOR IMPLEMENTING THE METHOD AND OBJECTS THUS BRANDED |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108466387B (en) * | 2018-04-02 | 2020-02-18 | 詹智胜 | Ball forming die and process |
-
1980
- 1980-07-03 GB GB8021884A patent/GB2078598B/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2626810A1 (en) * | 1988-02-08 | 1989-08-11 | Ryo Catteau Sa Ste Nle Ets | METHOD OF MARKING THE SURFACE OF OBJECTS, MEANS FOR IMPLEMENTING THE METHOD AND OBJECTS THUS BRANDED |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2078598B (en) | 1984-01-04 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 732 | Registration of transactions, instruments or events in the register (sect. 32/1977) | ||
| PCNP | Patent ceased through non-payment of renewal fee |