GB2220153A - Production of filmed formwork - Google Patents
Production of filmed formwork Download PDFInfo
- Publication number
- GB2220153A GB2220153A GB8814825A GB8814825A GB2220153A GB 2220153 A GB2220153 A GB 2220153A GB 8814825 A GB8814825 A GB 8814825A GB 8814825 A GB8814825 A GB 8814825A GB 2220153 A GB2220153 A GB 2220153A
- Authority
- GB
- United Kingdom
- Prior art keywords
- board
- cooling
- section
- belt
- heating
- 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.)
- Withdrawn
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27D—WORKING VENEER OR PLYWOOD
- B27D1/00—Joining wood veneer with any material; Forming articles thereby; Preparatory processing of surfaces to be joined, e.g. scoring
- B27D1/04—Joining wood veneer with any material; Forming articles thereby; Preparatory processing of surfaces to be joined, e.g. scoring to produce plywood or articles made therefrom; Plywood sheets
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B7/00—Moulds; Cores; Mandrels
- B28B7/38—Treating surfaces of moulds, cores, or mandrels to prevent sticking
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G9/00—Forming or shuttering elements for general use
- E04G9/02—Forming boards or similar elements
- E04G9/05—Forming boards or similar elements the form surface being of plastics
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Architecture (AREA)
- Manufacturing & Machinery (AREA)
- Life Sciences & Earth Sciences (AREA)
- Civil Engineering (AREA)
- Ceramic Engineering (AREA)
- Structural Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Wood Science & Technology (AREA)
- Forests & Forestry (AREA)
- Veneer Processing And Manufacture Of Plywood (AREA)
- Laminated Bodies (AREA)
- Forms Removed On Construction Sites Or Auxiliary Members Thereof (AREA)
- Dry Formation Of Fiberboard And The Like (AREA)
Description
APPARATUS FOR PRODUCING FILMED FORMWORK The present invention relates to
an apparatus for producing filmed wooden formwork used in receiving a cast concrete, the filming being designed to increase the surface strength and releasability of formwork from the cast concrete.
It is known in the art to cover wooden formworks such as plywood formworks, with polyolefine resin films to enhance their surface strength and smoothness. Filmed formworks are produced by at least two separate processes; the first step is to make polyolefine resin films, and the second step is to cover plywoods with -the films, which are bonded thereto with an adhesive. In most cases a final step is required to trim the eges of the films. Thus the known process is time- and labour- consuming. This reflects in the production cost.
To solve these problems the inventors have proposed an automatic process for making filmed formwork, which is disclosed in British Patent No. 2, 155,850. This process has save the labour to attach films to individual formworks. In addition, the appearance of filmed formworks has been improved.
The process mentioned above requires two heating spots at which the polyolefine resin is melted and its molten state is maintained. The provision of two heating units increases the size and cost of the equipment, particularly when two infrared ray heaters are used at 220153 f two heating stations.
An object of the present invention is to at least mitigate the problems involved in carrying out the process mentioned above; to enable the process to be carried out economically and efficiently.
According to the present invention we propose apparatus for filming the surface of a board used for formwork, the apparatus comprising a conveyor for introducing the board into the apparatus, a first disperser for dispersing an adhesive polyolefine copolymer resin powder on the board, a main heating device for heating the resin powder on the board, a press roller unit for pressing the board thereby to make the resin spread over the surface thereof, a second disperser for dispersing a non-adhesive polyolefine resin powder on the first film, and a belt-type press unit for pressing the board at a heating temperature in a first section and at a cooling temperature in a second section, the first section and the second section being separated by a partition such that the heating atmosphere and the cooling atmosphere in the respective sections do not mix with each other.
Other objects and advantages of the present invention will become more apparent from the following detailed description, by way of example, of one embodiment of apparatus according to the present invention. Reference is made to the accompanying drawings which is a schematic view of the apparatus.
k -3 The drawing shows a board 1 which is introduced on the apparatus by a conveyor 19. During the passage an adhesive polyolefine copolymer resin powder 3 is dispersed on the plywood 1 through a disperser 2. The board 1 continues to advance under a heater 4 (e.g. an infrared ray heater) and is pressed by a pair of press rollers 5,5', thereby enabling the resin to spread over the surface of the board 1. Downstream of the press rollers 5,5' there is a second disperser 6, which disperses a non-adhesive polyolefine resin 7 on the board 1. Then the board 1 is pressed by a belt-type press unit 8, which will be described in greater detail.
This press unit 8 comprises an endless steel belt 9, tension rollers 10, and a plurality of pairs of press rollers 11,12. The belt 9 runs between the paired rollers 11 and 12. The board 1 is pressed directly by the steel belt 9 against the lower press rollers 12. The press unit 8 is divided by a partition 13 into a first section 14 and a second section 15. The first section 14 has heaters 16 located near the upper rollers 11 to heat the steel belt 9, and the second section 15 has a cooling device 17, such as a cold air duct or a cold water spray nozzle, so as to cool the films of the board 1. Heaters 18 maintain the temperature of the steel belt 9 and the partition 13 separates the two sections 14 and 15 such that the heating atmosphere and the cooling atmosphere do not mix with each other.
For a better understanding examples will be described:
1 t Example 1
A five-ply plywood having a thickness of 12mm was introduced at a speed of 3m/min, and an adhesive polyolefine copolymer resin "Admer NS-10011 produced by Mitsui Oil Chemical Co. Ltd., in a powdery form of to 150 meshes was evenly dispersed on the plywood at a rate of 3 Og/M2 The plywood having a dispersed powder thereon was heated by an infrared ray furnace 4 having a length of 6m, and was pressed by the first press rollers heated to 1OO'C. Then a non-adhesive polyolefine resin "Hizex-8200CP" produced by Mitsui Oil Chemical Co. Ltd. in a powdery form of 50 to 200 meshes was dispersed on the first film through an electrostatic spray gun 6 at a rate of 150 g/M2. The belt-type press unit 8 had a carbon steel endless belt 9 having a thickness of 1.0 mm, and a length of 13m. The resin on the plywood entering the heating section 14 had a temperature of 550C and the steel belt was heated to 180C. The heating section 14 was 8m long, along which the plywood 1 was pressed and heated. The cooling section 15 had a cold air duct and a cold water spray nozzle. The resin on the plywood leaving the cooling section 15 was found crystallised, so that the plywood was smoothly released from the belt 9. The resin "Hizex-8200CP" has such a low fluidity as the index of 0.03, but nevertheless, the surface of the plywood was smoothly finished.
i Example 2
A wafer board having a thickness of 18mm was introduced. The board had numerous dimples (2 OMM2 or less in area, 0.1 to 1.5mm in depth) thereon. After the board was treated in the same manner as Example 1 until it reached the second disperser 6. A non-adhesive polyolefine resin "Hizex-8200CP" produced by Mitsui Oil Chemical Co. Ltd., in a powdery form of 50 to 200 meshes was dispersed thereon by the disperser 2. The rest of process was the same as Example 1. The dimples were filled with the resin, and the uneven surface was found smooth.
As is evident from the foregoing description, apparatus has only one main heater, and instead of providing another heater, a belt-type press unit which functions as a presser and a heater is employed. The steel belt of good thermal conductivity heats the resin on the board and maintains its temperature while it is pressed. Thus, the apparatus saves energy. An uneven surface of the board is favourably remedied with resin under the continuous pressure provided by the heated steel belt.
Claims (7)
1. Apparatus for filming the surface of a board used for formwork, the apparatus comprising a conveyor for introducing the board into the apparatus, a first disperser for dispersing an adhesive polyolefine copolymer resin powder on the board, a main heating device for heating the resin powder on the board, a press roller unit for pressing the board thereby to make the resin spread over the surface thereof, a second disperser for dispersing a non-adhesive polyolefine resin powder on the first film, and a belt-type press unit for pressing the board at a heating temperature in a first section and at a cooling temperature in a second section, the first section and the second section being separated by a partition such that the heating atmosphere and the cooling atmosphere in the respective sections do not mix with each other.
2. Apparatus according to claim 1, wherein the belttype press unit comprises a single endless steel belt and a plurality of paired press rollers having the belt running therebetween, and the first section including heating unit for heating the belt and producing hot atmosphere, and the second section including a cooling unit for cooling the belt and producing a cooling atmosphere.
3. Apparatus according to claim 1 or claim 2 wherein the main heating device is an infrared ray heater.
4. Apparatus according to any one of claims lto 3, wherein the board is plywood.
5. Apparatus according to any one wherein the cooling unit is a cold
6. Apparatus according to any one of wherein the cooling unit is a cold air
7. Apparatus for filming the surface constructed and arranged substantially as hereinbefore described with reference to and as illustrated in the accompanying drawings.
of claims 1 to 4, water spray nozzle. claims 1 to 4, supply duct. of board, Pubushed 1989 atThe Patent Office, State House, 66/71 High Holborn. London WCIR 4TP. Further copies maybe obtainedfrom ThePatentOffioe. Sales Branch, St Mary Cray, Orpington, Kent BR5 3RD. Printed by Multiplex techniques Itd, St Mar7 Cray, Kent, Con. V87
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19883821434 DE3821434A1 (en) | 1988-06-24 | 1988-06-24 | DEVICE FOR PROVIDING THE SURFACE OF A PANEL USED FOR PANELING WITH A THIN COATING |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB8814825D0 GB8814825D0 (en) | 1988-07-27 |
| GB2220153A true GB2220153A (en) | 1990-01-04 |
Family
ID=6357216
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8814825A Withdrawn GB2220153A (en) | 1988-06-24 | 1988-06-22 | Production of filmed formwork |
Country Status (3)
| Country | Link |
|---|---|
| DE (1) | DE3821434A1 (en) |
| FR (1) | FR2633212A1 (en) |
| GB (1) | GB2220153A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005083198A1 (en) * | 2004-02-27 | 2005-09-09 | Orica Australia Pty. Ltd. | Formply alternative |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB887737A (en) * | 1959-02-26 | 1962-01-24 | Technical Waxes Ltd | Improvements relating to apparatus and methods for glaze coating paper and the like |
| GB1296236A (en) * | 1969-01-30 | 1972-11-15 |
-
1988
- 1988-06-22 GB GB8814825A patent/GB2220153A/en not_active Withdrawn
- 1988-06-24 DE DE19883821434 patent/DE3821434A1/en not_active Withdrawn
- 1988-06-28 FR FR8808659A patent/FR2633212A1/en not_active Withdrawn
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB887737A (en) * | 1959-02-26 | 1962-01-24 | Technical Waxes Ltd | Improvements relating to apparatus and methods for glaze coating paper and the like |
| GB1296236A (en) * | 1969-01-30 | 1972-11-15 |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005083198A1 (en) * | 2004-02-27 | 2005-09-09 | Orica Australia Pty. Ltd. | Formply alternative |
Also Published As
| Publication number | Publication date |
|---|---|
| GB8814825D0 (en) | 1988-07-27 |
| FR2633212A1 (en) | 1989-12-29 |
| DE3821434A1 (en) | 1989-12-28 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |