AU597782B2 - Mould for use on twin-walled sheeting - Google Patents
Mould for use on twin-walled sheeting Download PDFInfo
- Publication number
- AU597782B2 AU597782B2 AU11215/88A AU1121588A AU597782B2 AU 597782 B2 AU597782 B2 AU 597782B2 AU 11215/88 A AU11215/88 A AU 11215/88A AU 1121588 A AU1121588 A AU 1121588A AU 597782 B2 AU597782 B2 AU 597782B2
- Authority
- AU
- Australia
- Prior art keywords
- mould
- moulding
- polycarbonate sheet
- sheet
- casing
- 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.)
- Ceased
Links
- 238000000465 moulding Methods 0.000 claims description 17
- 239000000463 material Substances 0.000 claims description 14
- 229920000515 polycarbonate Polymers 0.000 claims description 8
- 239000004417 polycarbonate Substances 0.000 claims description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- 239000011810 insulating material Substances 0.000 claims description 4
- 229910001220 stainless steel Inorganic materials 0.000 claims description 4
- 239000010935 stainless steel Substances 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 3
- 229920005830 Polyurethane Foam Polymers 0.000 claims description 2
- 239000011496 polyurethane foam Substances 0.000 claims description 2
- 239000006260 foam Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
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
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/56—Coatings, e.g. enameled or galvanised; Releasing, lubricating or separating agents
-
- 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
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/0011—Moulds or cores; Details thereof or accessories therefor thin-walled moulds
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
Description
-4
H
FORM 10 59 7 U 2 COMMONWEALTH OF AUSTRALIA PATENTS ACT 1952 COMPLETE
SPECIFICATION
(ORIGINAL)
FOR OFFICE USE: Class Int. Class Application Number: PI1649 Lodged: 29 April 1987 It Accepted: Published: Priority: Related Art: EfDJLA I w
V
t NTy OLLA- U'LLARS 4 4 1 Name and Address of Applicant: Actual Inventor: Address for Service: Precision Roofing Accessories Co.
108-110 Bowden Street West Ryde New South Wales 2114
AUSTRALIA
Graham Long, Pty. Ltd J FESTAWFO'TrO™™ tA .T.ACE MAIL @FFICERV/ Spruson Ferguson, Patent Attorneys, Level 33 St Martins Tower, 31 Market Street, Sydney, New South Wales, 2000, Australia Complete Specification for the invention entitled: Mould For Use On Twin-Walled Sheeting The following statement is a full description of this invention, including the best method of performing it known to me/us 5815/2 r 1, i i MOULD FOR USE ON TWIN-WALLED SHEETING The present invention relates to the moulding of sheeting for such uses as roofing, and in particular to the moulding of twin-walls sheeting for sky-lights.
In the past, roofing structures such as sky-lights, have been moulded from a smooth acrylic material in a conventional mould and apparatus. This apparatus has required that the sheeting material is heated uniformly by means such as heating elements, and that the heated material is then brought into contact with a stationary mould, and pressed thereon so as to form the material to the desired shape. These conventional moulds can be made of wood or any other substances that is regularly used in the moulding industry.
With the onset of a new sheeting material known a polygal (Registered Trade Mark) such moulding techniques are no longer possible. The sheeting is a twin-walled polycarbonate material, with smooth outer surfaces, but unlike its predecessor, does not have a solid interior but comprises a series of webbs running from one side of the sheet to the other. In this way the sheeting is lightweight and has excellent light transmission and insulating properties making it highly suitable for roofing.
However, due to the partially hollow interior, the sheeting does not readily retain heat applied thereto and this results in a temperature differential on the surfaces of the sheet. Therefore, when the heated sheet is brought into contact with the mould, the resultant temperature differential causes cracks, and bubbles to appear on the surfaces of the moulded sheet,. Clearly, this is an undesired effect of using this new o 25 material.
Therefore, it is an object of the present invention to provide a mould which will compensate for the lightweight nature of such building o 0.
materials and produces a smooth finish.
Accordingly, in one broad form the present invention provides a mould 30 for use in moulding apparatus adapted for moulding a twin-walled polycarbonate sheet material, said mould comprising: a mould surface having a predetermined form corresponding to the desired shape of a moulded finished product, the surface being a polished stainless steel material which forms part of a mould casing, and wherein said casing is filled with an insulating material for retaining heat proximate said mould surface during forming of the polycarbonate sheet.
Preferably, the mounting structure is made of galvanized iron and the insulating material is polyurethane foam.
1
J
-i j 2a One embodiment of the present invention will now be described, by way of example only, with reference to the accompanying drawings in which: i 4,
(I
'r 666b
O
i d i dClrr Figure 1 is a cross-sectional view of the mould of the present invention; Figure 2 is a schematic representation of an apparatus containing the mould of the present invention; and Figure 3 is a schematic representation of the apparatus of Figure 2 wherein the sheeting material is clearly in contact with the mould of the present invention.
In Figure 1 there is depicted the mould 10 of the present invention which comprises a moulding surface 11 and structure 12 onto which the moulding surface 11 is mounted. In the preferred embodiment the moulding surface 11 and structure 12 form an enclosed box which is filled with polyeurethane foam 13.
In Figure 2 the mould 10 is seen assembled within a conventional press 14, with a sheet of twin-walled polycarbonate material 15 located therein. The sheet 15 is heated by way of the elements 16 to the desired temperature for moulding, and then brought into contact with the moulding surface 11 by lowering pneumatic cylinders 17. Figure 3 shows the sheet as formed over the mould The moulding surface 11 is of a polished stainless steel and is preferably of a 2 mm thick 304 grade steel. Also, the structure 12 is preferably 3.5 mm galvanised iron. Due to the properties of th, substances used, ie, the stainless steel and foam, the temperature differential mentioned earlier is reduced, and in some cases eliminated so as to produce a smooth surface on the moulded sheet.
r15 The above mentioned describes only one embodiment of the present invention and modifications, obvious to those skilled in the art, can be made thereto without departing from the scope of the present invention.
For example, the mould could be used in a different apparatus which does not require the use of pneumatic cylinders nor conventional heating o elements, but theeffect of the mould produces the same unique result. o3, elements, but the effect of the mould produces the same unique result.
j-
P
TCW/2244z 23932
Claims (7)
1. A mould for use in moulding apparatus adapted for moulding a twin-walled polycarbonate sheet material, said mould comprising: a mould surface having a predetermined form corresponding to the desired shape of a moulded finished product, the surface being a polished stainless steel material which forms part of a mould casing, and wherein said casing is filled with an insulating material for retaining heat proximate said mould surface during forming of the polycarbonate sheet.
2. The mould of claim 1 wherein said mould casing is supported by a mounting structure.
3. The mould of claim 1 wherein said mounting structure is made of galvanized iron.
4. The mould of any one of claims 1 to 3 wherein said insulating material is polyurethane foam. o
5. Moulding apparatus comprising the mould of any one of claims 1 to 4 which comprises a press for supporting a polycarbonate sheet and moving said sheet into moulding contact with the mould surface. o
6. The apparatus of claim 5 wherein said mould apparatus further comprises heating elements adapted to heat said polycarbonate sheet and said mould surface prior to the forming process.
7. A mould substantially as hereinbefore described with reference to, and as shown in the accompanying drawings. f, 0 08. Moulding apparatus as hereinbefore described with reference to, and as shown in the accompanying drawings. o o DATED this SECOND day of MARCH 1990 Precision Roofing Accessories Co Pty Ltd o o Patent Attorneys for the Applicant SPRUSON FERGUSON -I i 2~ ,.A
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU11215/88A AU597782B2 (en) | 1987-04-29 | 1987-04-29 | Mould for use on twin-walled sheeting |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU11215/88A AU597782B2 (en) | 1987-04-29 | 1987-04-29 | Mould for use on twin-walled sheeting |
| AUPI164987 | 1987-04-29 | ||
| AUPI1649 | 1987-04-29 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| AU1121588A AU1121588A (en) | 1989-01-27 |
| AU597782B2 true AU597782B2 (en) | 1990-06-07 |
Family
ID=25614403
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU11215/88A Ceased AU597782B2 (en) | 1987-04-29 | 1987-04-29 | Mould for use on twin-walled sheeting |
Country Status (1)
| Country | Link |
|---|---|
| AU (1) | AU597782B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017066238A1 (en) * | 2015-10-12 | 2017-04-20 | Ppg Industries Ohio, Inc. | Method and apparatus for making a polymeric aircraft window panel |
-
1987
- 1987-04-29 AU AU11215/88A patent/AU597782B2/en not_active Ceased
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017066238A1 (en) * | 2015-10-12 | 2017-04-20 | Ppg Industries Ohio, Inc. | Method and apparatus for making a polymeric aircraft window panel |
| US11110634B2 (en) | 2015-10-12 | 2021-09-07 | Ppg Industries Ohio, Inc. | Method and apparatus for making a polymeric aircraft window panel |
Also Published As
| Publication number | Publication date |
|---|---|
| AU1121588A (en) | 1989-01-27 |
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