WO2005117578A1 - Floating element and a method for production of such - Google Patents
Floating element and a method for production of such Download PDFInfo
- Publication number
- WO2005117578A1 WO2005117578A1 PCT/NO2005/000184 NO2005000184W WO2005117578A1 WO 2005117578 A1 WO2005117578 A1 WO 2005117578A1 NO 2005000184 W NO2005000184 W NO 2005000184W WO 2005117578 A1 WO2005117578 A1 WO 2005117578A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- floating element
- floating
- element according
- blowing agent
- raw material
- Prior art date
Links
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 10
- 238000000034 method Methods 0.000 claims abstract description 21
- 229920001155 polypropylene Polymers 0.000 claims abstract description 9
- -1 polypropylene Polymers 0.000 claims abstract description 7
- 239000004743 Polypropylene Substances 0.000 claims abstract description 6
- 239000004033 plastic Substances 0.000 claims abstract description 6
- 229920003023 plastic Polymers 0.000 claims abstract description 6
- 239000004604 Blowing Agent Substances 0.000 claims description 12
- 239000002994 raw material Substances 0.000 claims description 11
- 239000004676 acrylonitrile butadiene styrene Substances 0.000 claims description 2
- 239000004800 polyvinyl chloride Substances 0.000 claims description 2
- 239000004698 Polyethylene Substances 0.000 claims 2
- 229920000573 polyethylene Polymers 0.000 claims 2
- 230000015572 biosynthetic process Effects 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 7
- 239000000203 mixture Substances 0.000 abstract description 3
- 238000007664 blowing Methods 0.000 abstract description 2
- 230000009172 bursting Effects 0.000 abstract 1
- 238000001816 cooling Methods 0.000 description 3
- 238000005187 foaming Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 239000004594 Masterbatch (MB) Substances 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229930091051 Arenine Natural products 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000002666 chemical blowing agent Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000012768 molten material Substances 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B1/00—Constructional features of ropes or cables
- D07B1/20—Buoyant ropes, e.g. with air-filled cellular cores; Accessories therefor
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01K—ANIMAL HUSBANDRY; AVICULTURE; APICULTURE; PISCICULTURE; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
- A01K75/00—Accessories for fishing nets; Details of fishing nets, e.g. structure
- A01K75/04—Floats
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2501/00—Application field
- D07B2501/20—Application field related to ropes or cables
- D07B2501/2038—Agriculture, forestry and fishery
Definitions
- the present invention concerns a floating element to be used for keeping fishing net and fishing gear floating. It is also described a method for producing such floating elements.
- the present invention utilizes special mixing ratios of the different raw materials of polypropylene (PP), polyetylene (PE), polystyrene (PS), polyvinyl chloride (PVC), acrylonitrile butadiene styrene (ABS).
- PP polypropylene
- PE polyetylene
- PS polystyrene
- PVC polyvinyl chloride
- ABS acrylonitrile butadiene styrene
- the preferred plastic material is polypropylene (PP).
- the blowing agent producing the structure of the cells is based on an endothermic process.
- the mixing ratios between the raw material and the blowing agent are from 95 - 99.5 % of the raw material to 5 - 0.5 % of the blowing agent.
- Fig. 1 shows a schematic outline of the process and the apparatus
- Fig. 2 shows a cross-section of an extruded floating element.
- the process is starting with plastic raw material and the blowing agent being mixed in suitable mixing ratio, for about 15 minutes in a separate mixing unit.
- the purpose is to obtain a correct dispersion of the two materials.
- After the mixing they are emptied into a container where the mixture is sucked continuous into the extruder 1.
- the preparing of the raw material is initiated.
- the material is screwed through different zones (1 - 12) in the extruder where the material gradually becomes molten. By increasing the temperature and pressure, the chemical foaming process starts.
- the cavities filled with air (the cell structure) in the floating element are created when the molten material leave the nozzle, as the blowing agent expands.
- the extruder may consist of a number of zones. In the present case there are nine zones in the extruder, and four zones in the nozzle 2.
- the temperature will here depend on the raw material and the desired properties. For the present process, the temperature preferably varies from 120 °C to 250 °C.
- the floating element is formed with a smooth surface film having a thickness from 0 to 0.5 mm.
- the thickness of the surface film is regulated in the process of cooling/calibration after the product emerges from the nozzle 2.
- the surface films produce a protection against external influences and damages, and provide that the floating elements are robust and resist larger load as exposed to during fishing in deep seas.
- the shearing device 6 preferably a guillotine, is cutting the extruded material directly on the line into the desired length.
- a common length of the cylindrical floating elements is from 10 - 100 mm.
- the floating elements are produced simultaneously with a plurality of cavities (several strings simultaneously) and cut direct on the lines into desired length.
- the preferred blowing agent used in the process is HYDROCEROL (trademark) produced by Clariant Germany. This is a chemical blowing agent in master batch form, based on an endothermic blowing process. This is the preferred blowing agent, but the process for the production is not limited to this. Any blowing agent with the suitable chemical properties can be used to obtain the requested results.
- the chemical reaction of the master batch initiates at ca. 160 °C.
- the optimum generation of gas occurs between 160 and 220 °C.
- Figure 2 is a schematic cross-section of a floating element and shows that cells of relative equal size, pores or cavities 10, dispersed relatively uniform over the length and the cross-section of the entire floating element.
- the surface film 11 constitutes a protective layer providing that the floating element with the cavities will not be inflicted by damage, in such a way they resist the pressures the elements are exposed to during fishing in deep seas.
- the density in the completed finished elements is between 0.3 and 0.8 kg/dm 3 , preferably between 0.4 and 0.65 kg/dm 3 . It is in principle requested that the density is as low as possible, but if the density is too low, i.e. there are too many cavities in the structure, this can result in cracking the floating element, making it collapse and by taking in water. The floating element will be especially exposed for this on large depths under high pressure. If the density is low, i.e. few cavities in the structure, this will produce poor buoyancy properties. In the floating elements according to the invention a balance between the buoyancy properties and the regard towards collapse and cracking of the elements has been found.
- the floating elements produced by the process are very robust as they withstand large pressures on ocean depths.
- the structure of the cells provide satisfactory buoyancy as floating elements to be used with net and other fishing gear.
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Environmental Sciences (AREA)
- Marine Sciences & Fisheries (AREA)
- Animal Husbandry (AREA)
- Biodiversity & Conservation Biology (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NO20042281A NO20042281L (en) | 2004-06-02 | 2004-06-02 | Flow element as well as feed material for the manufacture of such |
NO20042281 | 2004-06-02 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2005117578A1 true WO2005117578A1 (en) | 2005-12-15 |
Family
ID=35005900
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/NO2005/000184 WO2005117578A1 (en) | 2004-06-02 | 2005-06-02 | Floating element and a method for production of such |
Country Status (2)
Country | Link |
---|---|
NO (1) | NO20042281L (en) |
WO (1) | WO2005117578A1 (en) |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3407151A (en) * | 1964-06-18 | 1968-10-22 | Shell Oil Co | Production of expandable and cellular resin products |
WO1990000644A1 (en) * | 1988-07-15 | 1990-01-25 | Timo Piirto | A floatable cord and a method for manufacturing the same |
WO1993015132A1 (en) * | 1992-02-04 | 1993-08-05 | The Dow Chemical Company | Dimensionally-stable polypropylene foam expanded with inorganic blowing agents |
WO1996030180A1 (en) * | 1995-03-31 | 1996-10-03 | Exxon Chemical Patents Inc. | Foamed rotationally molded articles |
US5609803A (en) * | 1991-11-13 | 1997-03-11 | Centro Sviluppo Settori Impiego S.R.1. | Process for manufacturing bodies of polymeric material, having a core of foamed material enclosed in an outer shell |
-
2004
- 2004-06-02 NO NO20042281A patent/NO20042281L/en unknown
-
2005
- 2005-06-02 WO PCT/NO2005/000184 patent/WO2005117578A1/en active Application Filing
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3407151A (en) * | 1964-06-18 | 1968-10-22 | Shell Oil Co | Production of expandable and cellular resin products |
WO1990000644A1 (en) * | 1988-07-15 | 1990-01-25 | Timo Piirto | A floatable cord and a method for manufacturing the same |
US5609803A (en) * | 1991-11-13 | 1997-03-11 | Centro Sviluppo Settori Impiego S.R.1. | Process for manufacturing bodies of polymeric material, having a core of foamed material enclosed in an outer shell |
WO1993015132A1 (en) * | 1992-02-04 | 1993-08-05 | The Dow Chemical Company | Dimensionally-stable polypropylene foam expanded with inorganic blowing agents |
WO1996030180A1 (en) * | 1995-03-31 | 1996-10-03 | Exxon Chemical Patents Inc. | Foamed rotationally molded articles |
Also Published As
Publication number | Publication date |
---|---|
NO20042281L (en) | 2005-12-05 |
NO20042281D0 (en) | 2004-06-02 |
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