WO2002083395A1 - A method of producing a film material and an abrasive material produced according to the method - Google Patents
A method of producing a film material and an abrasive material produced according to the method Download PDFInfo
- Publication number
- WO2002083395A1 WO2002083395A1 PCT/SE2002/000717 SE0200717W WO02083395A1 WO 2002083395 A1 WO2002083395 A1 WO 2002083395A1 SE 0200717 W SE0200717 W SE 0200717W WO 02083395 A1 WO02083395 A1 WO 02083395A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- mentioned
- layer
- particles
- film
- die
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D11/00—Constructional features of flexible abrasive materials; Special features in the manufacture of such materials
- B24D11/001—Manufacture of flexible abrasive materials
-
- 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
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/20—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of indefinite length
- B29C44/22—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of indefinite length consisting of at least two parts of chemically or physically different materials, e.g. having different densities
- B29C44/24—Making multilayered 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/07—Flat, e.g. panels
- B29C48/08—Flat, e.g. panels flexible, e.g. films
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
- B29C48/10—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels flexible, e.g. blown foils
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
- B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
- B29C48/21—Articles comprising two or more components, e.g. co-extruded layers the components being layers the layers being joined at their surfaces
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/30—Extrusion nozzles or dies
- B29C48/305—Extrusion nozzles or dies having a wide opening, e.g. for forming sheets
- B29C48/307—Extrusion nozzles or dies having a wide opening, e.g. for forming sheets specially adapted for bringing together components, e.g. melts within the die
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/30—Extrusion nozzles or dies
- B29C48/32—Extrusion nozzles or dies with annular openings, e.g. for forming tubular articles
- B29C48/335—Multiple annular extrusion nozzles in coaxial arrangement, e.g. for making multi-layered tubular 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/001—Combinations of extrusion moulding with other shaping operations
- B29C48/0012—Combinations of extrusion moulding with other shaping operations combined with shaping by internal pressure generated in the material, e.g. foaming
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/001—Combinations of extrusion moulding with other shaping operations
- B29C48/0018—Combinations of extrusion moulding with other shaping operations combined with shaping by orienting, stretching or shrinking, e.g. film blowing
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/001—Combinations of extrusion moulding with other shaping operations
- B29C48/0019—Combinations of extrusion moulding with other shaping operations combined with shaping by flattening, folding or bending
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/04—Particle-shaped
-
- 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
- B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
- B29K2105/04—Condition, form or state of moulded material or of the material to be shaped cellular or porous
-
- 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
- B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
- B29K2105/25—Solid
- B29K2105/251—Particles, powder or granules
-
- 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
- B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
- B29K2995/0037—Other properties
- B29K2995/0072—Roughness, e.g. anti-slip
-
- 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
- B29L2007/00—Flat articles, e.g. films or sheets
- B29L2007/008—Wide strips, e.g. films, webs
-
- 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
- B29L2009/00—Layered products
-
- 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
- B29L2023/00—Tubular articles
- B29L2023/001—Tubular films, sleeves
Definitions
- the present invention concerns a method of producing a film material.
- the invention also concerns an abrasive material produced according to the method.
- WO, A1 , 97/21536 shows a method of producing a sheet material, an apparatus for producing the material as well as an abrasive product produced in accordance with the method.
- the method comprises the steps to form a mixture of polymer and particles, to lead the mixture to an extrusion die, to extrude the mixture through the die in order to produce an extruded sheet of polymer comprising particles, to bring the extruded sheet to pass over a casting surface while the polymer is still in a softened form and at the same time to cause the polymer in the sheet to move towards the casting surface.
- Owing to the polymer being concentrated closest to the casting surface particles will be concentrated further from the casting surface in the extruded sheet.
- the respective concentration is achieved by applying an electrostatic charge to the extruded sheet before the sheet gets in contact with the casting surface in the form of a casting cylinder.
- the particles may be constituted by abrasing particles and an abrasive material is thus achieved.
- One purpose of the present invention is to create a method by which a film material in general and an abrasive material in particular may be produced without the absolute need for any casting surface. The method of production is thus also to be useful for so called blowing of film.
- a further purpose of the present invention is to provide an abrasive material which is produced in accordance with the method and thus especially a rationally and economically produced emery or abrasive cloth for dry and wet grinding.
- the invention thus comprises a method of producing a film material, the method comprising the steps of creating at least a first, a second and a third mixture comprising at least a first, a second and a third polymer respectively, leading each one of the mixtures to a co-extrusion die and co-extruding the mixtures through the die in order to produce a co-extruded film comprising at least a first, a second and a third layer respectively.
- At least the mentioned second mixture comprises a blowing agent at the same time as the mentioned second mixture creating the mentioned second layer in the co-extruded film, the mentioned second layer being surrounded by at least the mentioned first layer on one side and at least the mentioned third layer on the other side.
- the mentioned first mixture comprises particles.
- Each one of the mentioned particles is in every direction of a thickness which is larger than the thickness for the mentioned first layer without particles leading to the fact that the particles, through the expansion of the blowing agent in the mentioned second layer, are pressed out upon the surface of the mentioned first layer and create unevennesses in the surface layer there.
- the mentioned blowing agent may expand when it leaves the mentioned die.
- the mentioned blowing agent may be constituted by a chemical blowing agent of endo- or exothermal type.
- the mentioned particles may be of a size of 5-500 ⁇ m.
- the mentioned particles may be constituted by aluminium oxide, silicon carbide, zirconium alumina, grind glass, sapphire, garnet, diamond and/or magnetic powder such as iron powder or iron filings.
- the mentioned third layer may be stiffer than the mentioned first layer.
- the mentioned third layer may be thicker than mentioned first layer.
- the men- tioned third polymer may be of a viscosity, which is higher than the viscosity of the mentioned first polymer.
- the mentioned co-extrusion die may be constituted by a die ring being part of an equipment for blowing of a film.
- the mentioned co-extrusion die may be constituted by a slit die being part of an equipment for casting film.
- the invention thus also comprises an abrasive material for cutting working and which is produced in accordance with the method above.
- the abrasive material shows at least one surface layer with unevennesses, the mentioned unevennesses being constituted of particles in a first layer in a co-extruded film comprising at least three layers.
- the mentioned first layer with particles may, when the abrasive material is being used, be somewhat resilient towards a second porous layer situated between the mentioned first layer and a third layer in the mentioned co-extruded film.
- Figure 1 shows, in cross section, a co-extrusion die during planar extrusion according to the prior art.
- Figure 2 shows, in cross section, a co-extrusion die according to figure 1 dur- ing planar extrusion according to the invention.
- FIG. 3 shows, partly in cross section, an equipment for blowing of film according to the prior art.
- Figure 4 shows, in cross section, a part of the equipment for blowing of film according to figure 3 during blowing according to the invention.
- FIG 1 a previously known co-extrusion die 1 is shown during planar extrusion according to the prior art of film.
- three channels 2, 3 and 4 three more or less different but known compounded materials are flowing, each one compris- ing a polymer, and are co-extruded through the slit die to a laminate comprising three layers 5, 6 and 7.
- Co-extrusion dies exist for more as well as fewer layers.
- the layers according to the figure all have the same thickness but this may also vary. From the figure is also evident that each one of the layers is mainly of the same thickness nearby the die as well as a bit away from the same which charac- terise planar extrusion according to the prior art.
- FIG 2 the known co-extrusion die 1 is shown during planar extrusion according to the invention.
- an abrasive material is produced.
- a compounded material flows which is based upon a thermoplastic polymer containing 1-80% abrasive material in the form of particles 8 of an alloy or a mineral.
- Suitable thermoplastic polymers are polyolefins, polyester, polystyrene, polycarbonate, polyamide, polyurethane, EVA, EMA, EBA, thermoplastic elasto- meres such as SBS as well as EPDM and the like.
- Suitable materials for the particles 8 are aluminium oxide, silicon carbide, zirconium alumina, grind glass, sapphire, garnet, diamond and other hard materials according to the Mohr scale. The size of the particles may be 5-500 ⁇ m.
- the particles are first surface treated with silanes, titanates or peroxides in a high speed mixer of for example any of the makes Henchel or PMI.
- a high speed mixer for example any of the makes Henchel or PMI.
- the material is compounded in a single or double screw extruder of for example any of the makes Berstorff or Leistritz together with different types of additives and processural agents.
- the types of polymer, additives and processural agents vary and are combined from case to case.
- the compoundation means that the particles are dispersed to pri- mary particles and distributed in the polymer material comprising the mentioned additives and processural agents and that the mixture is extruded, cooled and cut to normal size of granulate, a form which is then easy to use in the final production of the grinding material.
- Suitable additives are pigment, reinforcement, UV-stabi- lisers, antioxidants, impact modifiers, flame retardants, softening agents, antistatic agents and the like.
- Suitable processural agents are lubricative agents, surface active agents, fluorelastomers and the like.
- thermoplastic polymer contains a balanced amount of a chemical blowing agent of endo- or exothermal type.
- the blowing agent as well as the additives and processural agents are put to the polymer material in the form of a concentrate, a so called master batch.
- a mixture flows which is based upon a thermoplastic polymer which may be filled with filling material in the form of dolomite, calcium carbonate and/or talc.
- the mixture also contains additives and processural agents. All or parts of the filling material may, if desired, be replaced for iron powder which has been magnetised in order to give the end product the advantage of easily being able to be mounted upon an abrasive tool which has been adapted for such a magnetic mounting.
- the particles 8 In order for the particles 8 really to give an abrasive effect in the layer 5 in the finished abrasive product it is needed that the particles 8 are moved out upon the surface of the layer 5 and create unevennesses in the surface layer. This movement is achieved by the blowing agent in the layer 6, as soon as it leaves the extrusion die 1 , expanding and thereby pressing the particles 8, which from the beginning nearby the die 1 partly reach into the middle layer 6, completely out of the middle layer 6.
- Each one of the abrasive particles 8 is large enough to be able to extend from the bottom level of the layer 5 to and past the top layer 5 irrespective of how the particles are turned and twisted.
- the particles will thus create the desired unevennesses in the surface layer and these unevennesses are only covered by an extremely thin layer of polymer which mainly follows the forms of the unevennesses and which is re- lated to the above mentioned chemical coupling between particles and polymer.
- the expansion of the blowing agent in the layer 6 may be directed mainly towards the layer 5 by making the second outer layer 7 stiffer and/or thicker than the layer 5 or by monitoring the viscosities of the materials in the melts.
- the blowing agent expands more or less continuously to the point where the material has solidi- fied/crystallised, the so called frost line 9. It is important that the abrasive particles 8 get a possibility of moving freely to and through the top level of the layer 5 without any cooling cylinder hindering the process.
- FIG 3 an equipment for blowing of film according to the prior art is shown.
- a ring formed co-extrusion die 10 is here aimed upwards.
- the die 10 blows a balloon-like body 1 1 the wall of which is all the layers being parts of the laminate.
- the laminate is collected between nip rolls 12, corona treated at 13 - i.e. treated with strong UV-light in order to break the surface down- and collected upon windup rolls.
- the film may also be antistatically treated and/or pressed (with paint or the like) before the winding up.
- the known equipment for blowing of film is shown under production of an abrasive material according to the invention. Three layers are used in the laminate in accordance with what has been earlier described in connection with planar extrusion.
- the layer 5 comprising particles and constituting the abrasive layer in the finished product, may constitute the outside of the balloon-like body 1 1 , like in the figure 4, or the inside of it. If the layer 5 constitutes the inside of the balloon-like body 1 1 the wearing upon the nip rolls 12 which are most often made of a rubber material will become less.
- the layer 5 with the abrasive particles 8 is laid as an inner layer at blowing.
- the choice whether the layer 5 with the abrasive particles 8 is to lay in an outer or inner layer is often in practice decided by which machine equipment one has to one's disposal.
- blowing agent concentrate in the form of a master batch (modified azodi- carbonamide)
- a blown film with a thickness of 250 ⁇ m was achieved of which the layer 5 (the abrasive layer in the finished product) showed a thickness of 70 ⁇ m, the middle layer 6 a thickness of 110 ⁇ m and the layer 7 finally a thickness of 70 ⁇ m.
- the number of layers in the laminate may be varied within rather wide limits as long as the abrasive layer is situated farthest out at any side and at least one layer comprising blowing agent constitutes any one of the middle layers.
- the number of layers that are recommended however is 3-7 whereby a blown film for the described aim may have a total thickness of 60-500 ⁇ m.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Laminated Bodies (AREA)
- Polishing Bodies And Polishing Tools (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE0101339-0 | 2001-04-12 | ||
SE0101339A SE521880C2 (en) | 2001-04-12 | 2001-04-12 | Method of making a film material and abrasive material made according to the method |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2002083395A1 true WO2002083395A1 (en) | 2002-10-24 |
Family
ID=20283790
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/SE2002/000717 WO2002083395A1 (en) | 2001-04-12 | 2002-04-11 | A method of producing a film material and an abrasive material produced according to the method |
Country Status (2)
Country | Link |
---|---|
SE (1) | SE521880C2 (en) |
WO (1) | WO2002083395A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7963827B2 (en) | 2006-07-14 | 2011-06-21 | Saint-Gobain Abrastives, Inc. | Backingless abrasive article |
US9028732B2 (en) * | 2010-08-16 | 2015-05-12 | Multi Technologies Industrial L.L.C. | Self-adhered single-sided slip-resistant material |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3855376A (en) * | 1971-04-15 | 1974-12-17 | Mitsubishi Rayon Co | Process for making structural material having a foamed inner layer |
GB1486638A (en) * | 1973-11-27 | 1977-09-21 | Alkor Gmbh | Matt and scratch-resistant films and process for their manufacture |
US4206165A (en) * | 1976-03-26 | 1980-06-03 | Tri-Seal International, Inc. | Method of co-extrusion with foam core |
US4221624A (en) * | 1978-04-03 | 1980-09-09 | Eslinger Haynes L | Method of manufacturing a foamed core thermoplastic sheet |
WO1997021536A1 (en) * | 1995-12-08 | 1997-06-19 | Minnesota Mining And Manufacturing Company | Sheet material incorporating particulate matter |
-
2001
- 2001-04-12 SE SE0101339A patent/SE521880C2/en not_active IP Right Cessation
-
2002
- 2002-04-11 WO PCT/SE2002/000717 patent/WO2002083395A1/en not_active Application Discontinuation
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3855376A (en) * | 1971-04-15 | 1974-12-17 | Mitsubishi Rayon Co | Process for making structural material having a foamed inner layer |
GB1486638A (en) * | 1973-11-27 | 1977-09-21 | Alkor Gmbh | Matt and scratch-resistant films and process for their manufacture |
US4206165A (en) * | 1976-03-26 | 1980-06-03 | Tri-Seal International, Inc. | Method of co-extrusion with foam core |
US4221624A (en) * | 1978-04-03 | 1980-09-09 | Eslinger Haynes L | Method of manufacturing a foamed core thermoplastic sheet |
WO1997021536A1 (en) * | 1995-12-08 | 1997-06-19 | Minnesota Mining And Manufacturing Company | Sheet material incorporating particulate matter |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7963827B2 (en) | 2006-07-14 | 2011-06-21 | Saint-Gobain Abrastives, Inc. | Backingless abrasive article |
US8349041B2 (en) | 2006-07-14 | 2013-01-08 | Saint-Gobain Abrasives, Inc. | Backingless abrasive article |
US9028732B2 (en) * | 2010-08-16 | 2015-05-12 | Multi Technologies Industrial L.L.C. | Self-adhered single-sided slip-resistant material |
Also Published As
Publication number | Publication date |
---|---|
SE0101339L (en) | 2002-10-13 |
SE0101339D0 (en) | 2001-04-12 |
SE521880C2 (en) | 2003-12-16 |
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