US20180036937A1 - Extrusion-to-sheet production line and method - Google Patents
Extrusion-to-sheet production line and method Download PDFInfo
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- US20180036937A1 US20180036937A1 US15/619,708 US201715619708A US2018036937A1 US 20180036937 A1 US20180036937 A1 US 20180036937A1 US 201715619708 A US201715619708 A US 201715619708A US 2018036937 A1 US2018036937 A1 US 2018036937A1
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- sheet
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- belt
- pattern
- optical element
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- 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
- B29C59/00—Surface shaping of articles, e.g. embossing; Apparatus therefor
- B29C59/02—Surface shaping of articles, e.g. embossing; Apparatus therefor by mechanical means, e.g. pressing
- B29C59/04—Surface shaping of articles, e.g. embossing; Apparatus therefor by mechanical means, e.g. pressing using rollers or endless belts
- B29C59/043—Surface shaping of articles, e.g. embossing; Apparatus therefor by mechanical means, e.g. pressing using rollers or endless belts for profiled articles
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- 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
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- 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
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/22—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of indefinite length
- B29C43/24—Calendering
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- B29C47/0021—
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- B29C47/004—
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- B29C47/8805—
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- B29C47/8845—
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- B29C47/885—
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- B29C47/886—
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- 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
- B29C48/0011—Combinations of extrusion moulding with other shaping operations combined with compression moulding
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- 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
- B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
- B29C48/91—Heating, e.g. for cross linking
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- 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
- B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
- B29C48/911—Cooling
- B29C48/9135—Cooling of flat articles, e.g. using specially adapted supporting means
- B29C48/914—Cooling of flat articles, e.g. using specially adapted supporting means cooling drums
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- 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
- B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
- B29C48/911—Cooling
- B29C48/9135—Cooling of flat articles, e.g. using specially adapted supporting means
- B29C48/9145—Endless cooling belts
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- 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
- B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
- B29C48/911—Cooling
- B29C48/9135—Cooling of flat articles, e.g. using specially adapted supporting means
- B29C48/915—Cooling of flat articles, e.g. using specially adapted supporting means with means for improving the adhesion to the supporting means
- B29C48/9155—Pressure rollers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D11/00—Producing optical elements, e.g. lenses or prisms
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- 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
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/32—Component parts, details or accessories; Auxiliary operations
- B29C43/44—Compression means for making articles of indefinite length
- B29C43/48—Endless belts
- B29C2043/486—Endless belts cooperating with rollers or drums
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- B29C47/0061—
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- 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
- B29C48/002—Combinations of extrusion moulding with other shaping operations combined with surface shaping
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- 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
- B29C59/00—Surface shaping of articles, e.g. embossing; Apparatus therefor
- B29C59/02—Surface shaping of articles, e.g. embossing; Apparatus therefor by mechanical means, e.g. pressing
- B29C59/04—Surface shaping of articles, e.g. embossing; Apparatus therefor by mechanical means, e.g. pressing using rollers or endless belts
Definitions
- FIG. 1 is a schematic side view of an exemplary extrusion-to-sheet production line embodiment.
- FIGS. 2A and 2B are enlarged exploded fragmentary cross-sections through the embossing belt, plastic sheet, and carrier film in the flat cooling area of the extruder-to-sheet production line of FIG. 1 , taken on the plane of the line 2 - 2 of FIG. 1 .
- FIGS. 3A and 3B are enlarged fragmentary cross-sections through the plastic sheet and carrier film of FIG. 1 downstream of the flat cooling area, taken on the plane of the line 3 - 3 of FIG. 1 .
- FIG. 4 is a flow chart of an example of a method to produce embossed plastic sheet from a continuously-extruded sheet of molten plastic using a continuous embossing belt.
- the extrusion-to-sheet production line and method comprise a first roll and a second roll set to a predetermined gap through which a continuously-extruded sheet of molten plastic material passes to calender the sheet to a predetermined thickness.
- the sheet is caused to pass through a nip formed between the second roll and a continuous belt looped around a third roll and a fourth roll spaced apart from one another.
- the nip is where the belt is at its closest point between the second roll and the third roll.
- the belt comprises an embossing pattern of optical element shapes that is an inverse pattern of a pattern of optical element shapes to be embossed at a first major surface of the sheet.
- the sheet remains in contact with the second roll until the sheet passes through the nip, where the pattern of optical element shapes on the belt is embossed into the first major surface of the sheet.
- Downstream of the third roll is a flat cooling area through which the belt passes while the first major surface of the sheet is still in contact with the embossing pattern on the belt for cooling the sheet and completing the set of the pattern of optical element shapes into the sheet while the sheet is in a flat configuration.
- Downstream of the flat cooling area is a separation area where the belt separates from the sheet after completing the set of the pattern of optical element shapes into the sheet.
- the extrusion-to-sheet production line has the advantage that relatively thick polymer sheets of a specified thickness containing a precise pattern of optical element shapes can be continuously produced at a relatively high rate.
- Typical production rates range from about 1.5 millimeters per second for sheets near the maximum of the thickness range described below to about 500 millimeters per second for sheets near the minimum of the thickness range.
- FIG. 1 shows an example of an extrusion-to-sheet production line or apparatus 10 comprising a first roll 12 and a second roll 14 set to a predetermined gap 16 through which a continuously-extruded sheet 18 of molten plastic material passes to calender the sheet to a predetermined thickness.
- the gap 16 is settable to calender the sheet 18 to a defined thickness.
- the calendered sheet 18 has a thickness of between about 0.3 millimeters and about 15 millimeters.
- the sheet 18 of molten plastic material is continuously extruded through a gap die 20 into the gap 16 between the first and second rolls 12 and 14 .
- the plastic material is comprised of a single optical material (for example, acrylic, polycarbonate or other appropriate material) which may be rigid or flexible depending on thickness.
- the sheet 18 After passing through the gap 16 , the sheet 18 remains in contact with the second roll 14 and rotation of the second roll 14 causes the sheet 18 to pass through a nip 22 formed between the second roll 14 and a continuous belt 24 looped around a heated third roll 26 and a cooled fourth roll 28 in spaced relation from the third roll 26 .
- the nip 22 is where the belt 24 is at the closest point between the second roll 14 and the third roll 26 .
- the first, second and third rolls 12 , 14 and 26 are located in order adjacent one another, and the third and fourth rolls 26 and 28 are offset from one another and configured to receive the continuous embossing belt 24 . In the example shown in FIG. 1 , the first, second and third rolls are stacked vertically one above the other.
- the second roll may include a first sub-roll and a second sub-roll adjacent one another.
- the gap is between the first roll and the first sub-roll of the second roll
- the nip is between the second sub-roll of the second roll and the third roll.
- the belt 24 comprises an embossing pattern 30 of optical element shapes 32 that is an inverse of a pattern 34 of optical element shapes 36 to be embossed at a first major surface 38 of the sheet 18 (see FIG. 2 ).
- the rolls described herein as being heated may be electrically heated, heated by circulating hot oil, or heated in another suitable way.
- the rolls described herein as being cooled may be cooled by circulating coolant, such as water.
- Rolls 12 , 14 , 26 and 28 are rotatably driven in the direction of the arrows shown in
- FIG. 1 using any suitable drive (including but not limited to a chain drive or synchronous hydraulic or electric motors, not shown) to advance the belt 24 and cause the continuously-extruded sheet 18 to pass through the gap 16 between the first and second rolls 12 and 14 and remain in contact with the second roll 14 until the sheet passes through the nip 22 .
- any suitable drive including but not limited to a chain drive or synchronous hydraulic or electric motors, not shown
- the nip transfers the pattern of optical element shapes 32 from the belt 24 to the extruded sheet 18 while the sheet is near or above the glass transition temperature of the plastic material.
- first roll 12 is cooled and the second roll 14 is heated to a temperature to maintain the extruded sheet 18 near, at or above its glass transition temperature upstream of the nip.
- both the first roll 12 and the second roll 14 are cooled to cool the extruded sheet 18 to a temperature at which the plastic material has sufficient structural integrity to form the sheet but is still malleable enough to emboss.
- a belt adjuster 39 is connected to the fourth roll 28 to steer the belt 24 around the third and fourth rolls 26 and 28 , and to adjust the spacing between the third and fourth rolls 26 and 28 to accommodate belts of different lengths and to allow the belt 24 to be installed and removed.
- a flat cooling area 40 Downstream of the third roll 26 is a flat cooling area 40 through which the belt 24 passes while the first major surface 38 of the sheet 18 is still in contact with the embossing pattern on the belt.
- at least one pressure roller 59 is provided in the region of the flat cooling area 40 for pressing the sheet against the belt to assist in maintaining the sheet in contact with the embossing pattern on the belt during passage through the flat cooling area.
- the flat cooling area 40 is located between the third and fourth rolls 26 and 28 such that the third roll rotates towards the flat cooling area, which is for cooling the sheet and completing the set of the pattern of optical element shapes 36 into the sheet while the sheet is in a flat configuration in order to maintain high geometrical tolerances on the individual optical element shapes of the pattern.
- the flat cooling area 40 includes a cooling element 41 through which a coolant is circulated to cool the sheet.
- the cooling element 41 is located close to the second major surface 48 of the sheet 18 .
- At least one pressure roller is provided downstream of the nip 22 and upstream of the flat cooling area 40 for pressing the sheet 18 against the embossing pattern on the belt 24 while the sheet is still in a hot state to set the pattern of optical element shapes 36 into the sheet.
- FIG. 1 shows three circumferentially-spaced pressure rollers 42 , 44 and 46 that are movable into and out of engagement with a second major surface 48 of the sheet for sequentially pressing the sheet against the belt downstream of the nip and upstream of the flat cooling area while the sheet is still in a hot state to set the pattern of optical element shapes into the sheet.
- a greater or lesser number of pressure rollers may be provided as desired.
- the pressure rollers 42 , 44 and 46 as well as the pressure roller 59 are each typically faced with rubber or another compliant material.
- FIG. 1 shows a carrier film 50 being superimposed into direct contact with the second major surface 48 of the sheet 18 downstream of the nip 22 and upstream of the flat cooling area 40 .
- FIG. 1 shows the carrier film 50 being fed from a supply reel 52 around a guide roller 54 for superimposing the carrier film 50 into direct contact with the second major surface 48 of the sheet 18 upstream of the first pressure roller 42 .
- the supply reel and guide roller are located to superimpose the carrier film into direct contact with the second major surface of the sheet upstream of the second roll 14 .
- the carrier film 50 is made of a suitable protective material such as biaxially oriented polyethylene terephthalate that has a glass transition temperature higher than the temperature of the sheet at the nip so the carrier film will not melt or fuse to the sheet.
- the carrier film 50 has a surface 55 with a finish that is transferred onto the second major surface 48 of the sheet by pressure asserted by one or more of the pressure rollers.
- FIGS. 2A and 2B schematically show examples of surface finishes on the carrier film 50 , a smooth finish 56 shown in FIG. 2A , and a matte finish 58 shown in FIG. 2B .
- the surface 55 of the carrier film 50 that is superimposed into direct contact with the second major surface 48 of the sheet 18 comprises an additional embossing pattern of optical element shapes that is an inverse pattern of an additional pattern of optical element shapes to be embossed at the second major surface 48 of the sheet.
- Exemplary optical element shapes 36 that are set into the first major surface 38 of the sheet 18 (and if desired also into the second major surface 48 of the sheet) include light-scattering elements, which are typically features of indistinct shape or surface texture, such as printed features, ink-jet printed features, selectively-deposited features, chemically etched features, laser etched features, and so forth.
- Such optical element shapes are typically formed in a master (not shown) by the above-mentioned processes and are transferred from the master to the belt 24 by a suitable process such as electro-forming.
- exemplary optical element shapes include features of well-defined shape such lenticular or prismatic grooves and features of well-defined shape that are small relative to the linear dimensions of the major surfaces of the sheet, which are sometimes referred to as micro-optical element shapes.
- the smaller of the length and width of micro-optical element shapes is less than one-tenth of the width of the sheet and the larger of the length and width of the micro-optical element shapes is less than one-half of the width of the sheet.
- the length and width of the micro-optical elements are measured in a plane parallel to the major surfaces of the sheet.
- Micro-optical elements are shaped to predictably reflect or refract light. However, one or more of the surfaces of the micro-optical elements may be modified, such as roughened, to produce a secondary effect on the light reflected or refracted by the micro-optical elements.
- At least one of the size, shape, depth, density and orientation of the optical element shapes 36 set into the sheet 18 may vary across the width and/or the length of the sheet.
- the size and density of the optical element shapes 36 set into the first major surface 38 of the sheet vary across the width of the sheet.
- the optical element shapes 36 set into the sheet 18 can be protrusions from the sheet as shown in FIG. 2A , or indentations into the sheet as shown in FIG. 2B .
- the maximum size of a light guide that can be made using the production line 10 is nominally equal to the width and length of the belt 24 .
- the production line 10 can be used to make light guides smaller than the maximum-size light guide by locating multiple discrete patterns of optical element shapes along the length and/or width of the belt.
- the patterns of optical element shapes need not be the same.
- the patterns of optical element shapes for the light guides of several tablet devices can be located on the belt alongside a pattern of optical element shapes for the light guide of a large-screen television.
- FIGS. 1, 3A and 3B show the sheet 18 and the carrier film 50 passing through a sheet output area 62 aligned tangentially with the third and fourth rolls 26 and 28 after the belt 24 has separated from the sheet 18 in the separation area 60 .
- the carrier film 50 is a disposable protective layer that can be subsequently removed from the sheet 18 whenever desired.
- FIG. 4 is a flow chart 68 of an example of a method to produce embossed plastic sheet from a continuously extruded-sheet of molten plastic using a continuous embossing belt.
- the continuously-extruded sheet 18 of molten plastic material passes between the first and second rolls 12 and 14 set to a predetermined gap to calender the sheet to a predetermined thickness (see FIG. 1 ).
- the sheet passes through the nip 22 formed between the second roll 14 and the continuous embossing belt 24 looped around the heated third roll 26 and cooled fourth roll 28 spaced apart from one another.
- the nip is where the belt is at the closest point between the second and third rolls.
- the belt comprises an embossing pattern of optical element shapes to be embossed at the first major surface of the sheet.
- the sheet is kept in contact with the second roll 14 until the sheet passes through the nip, where the pattern of optical element shapes on the belt is embossed into the first major surface of the sheet.
- the belt passes through the flat cooling area 40 downstream of the third roll 26 while the first major surface of the sheet is still in contact with the embossing pattern of optical element shapes on the belt to cool the sheet and complete the set of the pattern of optical element shapes into the sheet while the sheet is in a flat configuration.
- the belt separates from the sheet after completing the set of the pattern of optical element shapes into the sheet.
- the orientation of the extrusion-to-sheet production line is merely exemplary and different orientations can be used.
- the line can be inverted so that the embossed sheet exits the line at an area above the area through which the continuously-extruded sheet of molten plastic material enters the line or the line can be rotated through a suitable angle.
- the phrase “one of” followed by a list is intended to mean the elements of the list in the alternative.
- “one of A, B and C” means A or B or C.
- the phrase “at least one of” followed by a list is intended to mean one or more of the elements of the list in the alternative.
- “at least one of A, B and C” means A or B or C or (A and B) or (A and C) or (B and C) or (A and B and C).
Abstract
Extrusion-to-sheet production line and method comprise first and second rolls set to a predetermined gap through which a continuously-extruded sheet of molten plastic material passes to calender the sheet to a predetermined thickness. The sheet passes through a nip formed between the second roll and a continuous belt looped around a third roll and a fourth roll. The belt comprises an embossing pattern of optical element shapes that is an inverse pattern of optical element shapes to be embossed at a first major surface of the sheet. The sheet remains in contact with the second roll until the sheet passes through the nip, where the pattern of optical element shapes on the belt is embossed into the first major surfaces of the sheet. Downstream of the third roll is a cooling area through which the belt passes.
Description
- This application is a continuation of U.S. patent application Ser. No. 15/047,673, filed Feb. 19, 2016, which is a continuation of U.S. patent application Ser. No. 13/772,613, filed Feb. 21, 2013, which claims the benefit of U.S. Provisional Application Ser. No. 61/608,686, filed Mar. 9, 2012, the entire disclosures of which are incorporated herein by reference.
- It is known to continuously emboss patterns of micro-prismatic elements on one or more surfaces of sheets or films using one or more embossing bands or belts. However, there is a need to be able to produce thicker polymer sheets of a single material containing a pattern of optical elements at a relatively high rate while maintaining high tolerances on the geometry of the optical elements.
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FIG. 1 is a schematic side view of an exemplary extrusion-to-sheet production line embodiment. -
FIGS. 2A and 2B are enlarged exploded fragmentary cross-sections through the embossing belt, plastic sheet, and carrier film in the flat cooling area of the extruder-to-sheet production line ofFIG. 1 , taken on the plane of the line 2-2 ofFIG. 1 . -
FIGS. 3A and 3B are enlarged fragmentary cross-sections through the plastic sheet and carrier film ofFIG. 1 downstream of the flat cooling area, taken on the plane of the line 3-3 ofFIG. 1 . -
FIG. 4 is a flow chart of an example of a method to produce embossed plastic sheet from a continuously-extruded sheet of molten plastic using a continuous embossing belt. - The embodiments will now be described with reference to the drawings, wherein like reference numerals are used to refer to like elements throughout. The figures are not to scale. Features that are described and/or illustrated with respect to an exemplary embodiment may be used in the same way or in a similar way in one or more other embodiments and/or in combinations with or instead of the features of other embodiments.
- As described in detail below, the extrusion-to-sheet production line and method comprise a first roll and a second roll set to a predetermined gap through which a continuously-extruded sheet of molten plastic material passes to calender the sheet to a predetermined thickness. The sheet is caused to pass through a nip formed between the second roll and a continuous belt looped around a third roll and a fourth roll spaced apart from one another. The nip is where the belt is at its closest point between the second roll and the third roll. The belt comprises an embossing pattern of optical element shapes that is an inverse pattern of a pattern of optical element shapes to be embossed at a first major surface of the sheet. The sheet remains in contact with the second roll until the sheet passes through the nip, where the pattern of optical element shapes on the belt is embossed into the first major surface of the sheet. Downstream of the third roll is a flat cooling area through which the belt passes while the first major surface of the sheet is still in contact with the embossing pattern on the belt for cooling the sheet and completing the set of the pattern of optical element shapes into the sheet while the sheet is in a flat configuration. Downstream of the flat cooling area is a separation area where the belt separates from the sheet after completing the set of the pattern of optical element shapes into the sheet.
- The extrusion-to-sheet production line has the advantage that relatively thick polymer sheets of a specified thickness containing a precise pattern of optical element shapes can be continuously produced at a relatively high rate. Typical production rates range from about 1.5 millimeters per second for sheets near the maximum of the thickness range described below to about 500 millimeters per second for sheets near the minimum of the thickness range.
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FIG. 1 shows an example of an extrusion-to-sheet production line orapparatus 10 comprising afirst roll 12 and asecond roll 14 set to apredetermined gap 16 through which a continuously-extrudedsheet 18 of molten plastic material passes to calender the sheet to a predetermined thickness. Thegap 16 is settable to calender thesheet 18 to a defined thickness. In an example, the calenderedsheet 18 has a thickness of between about 0.3 millimeters and about 15 millimeters. - In the example shown in
FIG. 1 , thesheet 18 of molten plastic material is continuously extruded through a gap die 20 into thegap 16 between the first andsecond rolls - After passing through the
gap 16, thesheet 18 remains in contact with thesecond roll 14 and rotation of thesecond roll 14 causes thesheet 18 to pass through anip 22 formed between thesecond roll 14 and acontinuous belt 24 looped around a heatedthird roll 26 and a cooledfourth roll 28 in spaced relation from thethird roll 26. Thenip 22 is where thebelt 24 is at the closest point between thesecond roll 14 and thethird roll 26. The first, second andthird rolls fourth rolls continuous embossing belt 24. In the example shown inFIG. 1 , the first, second and third rolls are stacked vertically one above the other. However, other arrangements of the rolls are possible and may be used. Moreover, the second roll may include a first sub-roll and a second sub-roll adjacent one another. In this case, the gap is between the first roll and the first sub-roll of the second roll, and the nip is between the second sub-roll of the second roll and the third roll. - The
belt 24 comprises anembossing pattern 30 ofoptical element shapes 32 that is an inverse of apattern 34 ofoptical element shapes 36 to be embossed at a firstmajor surface 38 of the sheet 18 (seeFIG. 2 ). The rolls described herein as being heated may be electrically heated, heated by circulating hot oil, or heated in another suitable way. The rolls described herein as being cooled may be cooled by circulating coolant, such as water. - Rolls 12, 14, 26 and 28 are rotatably driven in the direction of the arrows shown in
-
FIG. 1 using any suitable drive (including but not limited to a chain drive or synchronous hydraulic or electric motors, not shown) to advance thebelt 24 and cause the continuously-extrudedsheet 18 to pass through thegap 16 between the first andsecond rolls second roll 14 until the sheet passes through thenip 22. As thesheet 18 passes through thenip 22, the nip transfers the pattern of optical element shapes 32 from thebelt 24 to theextruded sheet 18 while the sheet is near or above the glass transition temperature of the plastic material. - In an example, the
first roll 12 is cooled and thesecond roll 14 is heated to a temperature to maintain the extrudedsheet 18 near, at or above its glass transition temperature upstream of the nip. In another example, both thefirst roll 12 and thesecond roll 14 are cooled to cool theextruded sheet 18 to a temperature at which the plastic material has sufficient structural integrity to form the sheet but is still malleable enough to emboss. - In the example shown in
FIG. 1 , abelt adjuster 39 is connected to thefourth roll 28 to steer thebelt 24 around the third andfourth rolls fourth rolls belt 24 to be installed and removed. - Downstream of the
third roll 26 is aflat cooling area 40 through which thebelt 24 passes while the firstmajor surface 38 of thesheet 18 is still in contact with the embossing pattern on the belt. In the example shown inFIG. 1 , at least onepressure roller 59 is provided in the region of theflat cooling area 40 for pressing the sheet against the belt to assist in maintaining the sheet in contact with the embossing pattern on the belt during passage through the flat cooling area. - The
flat cooling area 40 is located between the third andfourth rolls FIG. 1 , theflat cooling area 40 includes acooling element 41 through which a coolant is circulated to cool the sheet. Thecooling element 41 is located close to the secondmajor surface 48 of thesheet 18. - In another example also shown in
FIG. 1 , at least one pressure roller is provided downstream of thenip 22 and upstream of theflat cooling area 40 for pressing thesheet 18 against the embossing pattern on thebelt 24 while the sheet is still in a hot state to set the pattern of optical element shapes 36 into the sheet.FIG. 1 shows three circumferentially-spacedpressure rollers major surface 48 of the sheet for sequentially pressing the sheet against the belt downstream of the nip and upstream of the flat cooling area while the sheet is still in a hot state to set the pattern of optical element shapes into the sheet. A greater or lesser number of pressure rollers may be provided as desired. Thepressure rollers pressure roller 59 are each typically faced with rubber or another compliant material. - In another example also shown in
FIG. 1 , acarrier film 50 is superimposed into direct contact with the secondmajor surface 48 of thesheet 18 downstream of thenip 22 and upstream of theflat cooling area 40.FIG. 1 shows thecarrier film 50 being fed from asupply reel 52 around aguide roller 54 for superimposing thecarrier film 50 into direct contact with the secondmajor surface 48 of thesheet 18 upstream of thefirst pressure roller 42. In another example, the supply reel and guide roller are located to superimpose the carrier film into direct contact with the second major surface of the sheet upstream of thesecond roll 14. - The
carrier film 50 is made of a suitable protective material such as biaxially oriented polyethylene terephthalate that has a glass transition temperature higher than the temperature of the sheet at the nip so the carrier film will not melt or fuse to the sheet. Thecarrier film 50 has asurface 55 with a finish that is transferred onto the secondmajor surface 48 of the sheet by pressure asserted by one or more of the pressure rollers.FIGS. 2A and 2B schematically show examples of surface finishes on thecarrier film 50, asmooth finish 56 shown inFIG. 2A , and amatte finish 58 shown inFIG. 2B . In another example, thesurface 55 of thecarrier film 50 that is superimposed into direct contact with the secondmajor surface 48 of thesheet 18 comprises an additional embossing pattern of optical element shapes that is an inverse pattern of an additional pattern of optical element shapes to be embossed at the secondmajor surface 48 of the sheet. - Exemplary optical element shapes 36 that are set into the first
major surface 38 of the sheet 18 (and if desired also into the secondmajor surface 48 of the sheet) include light-scattering elements, which are typically features of indistinct shape or surface texture, such as printed features, ink-jet printed features, selectively-deposited features, chemically etched features, laser etched features, and so forth. Such optical element shapes are typically formed in a master (not shown) by the above-mentioned processes and are transferred from the master to thebelt 24 by a suitable process such as electro-forming. Other exemplary optical element shapes include features of well-defined shape such lenticular or prismatic grooves and features of well-defined shape that are small relative to the linear dimensions of the major surfaces of the sheet, which are sometimes referred to as micro-optical element shapes. The smaller of the length and width of micro-optical element shapes is less than one-tenth of the width of the sheet and the larger of the length and width of the micro-optical element shapes is less than one-half of the width of the sheet. The length and width of the micro-optical elements are measured in a plane parallel to the major surfaces of the sheet. Micro-optical elements are shaped to predictably reflect or refract light. However, one or more of the surfaces of the micro-optical elements may be modified, such as roughened, to produce a secondary effect on the light reflected or refracted by the micro-optical elements. - At least one of the size, shape, depth, density and orientation of the optical element shapes 36 set into the
sheet 18 may vary across the width and/or the length of the sheet. In the examples shown inFIGS. 2A and 2B , the size and density of the optical element shapes 36 set into the firstmajor surface 38 of the sheet vary across the width of the sheet. The optical element shapes 36 set into thesheet 18 can be protrusions from the sheet as shown inFIG. 2A , or indentations into the sheet as shown inFIG. 2B . The maximum size of a light guide that can be made using theproduction line 10 is nominally equal to the width and length of thebelt 24. Theproduction line 10 can be used to make light guides smaller than the maximum-size light guide by locating multiple discrete patterns of optical element shapes along the length and/or width of the belt. The patterns of optical element shapes need not be the same. For example, the patterns of optical element shapes for the light guides of several tablet devices can be located on the belt alongside a pattern of optical element shapes for the light guide of a large-screen television. - Downstream of the
flat cooling area 40 is aseparation area 60 where thebelt 24 separates from thesheet 18 and thesuperimposed carrier film 50 after completing the set of the pattern of optical element shapes into the sheet.FIGS. 1, 3A and 3B show thesheet 18 and thecarrier film 50 passing through asheet output area 62 aligned tangentially with the third andfourth rolls belt 24 has separated from thesheet 18 in theseparation area 60. Thecarrier film 50 is a disposable protective layer that can be subsequently removed from thesheet 18 whenever desired. -
FIG. 4 is aflow chart 68 of an example of a method to produce embossed plastic sheet from a continuously extruded-sheet of molten plastic using a continuous embossing belt. - In
block 70 the continuously-extrudedsheet 18 of molten plastic material passes between the first andsecond rolls FIG. 1 ). - In
block 72 the sheet passes through thenip 22 formed between thesecond roll 14 and thecontinuous embossing belt 24 looped around the heatedthird roll 26 and cooledfourth roll 28 spaced apart from one another. The nip is where the belt is at the closest point between the second and third rolls. The belt comprises an embossing pattern of optical element shapes to be embossed at the first major surface of the sheet. - In
block 74 the sheet is kept in contact with thesecond roll 14 until the sheet passes through the nip, where the pattern of optical element shapes on the belt is embossed into the first major surface of the sheet. - In
block 76 the belt passes through theflat cooling area 40 downstream of thethird roll 26 while the first major surface of the sheet is still in contact with the embossing pattern of optical element shapes on the belt to cool the sheet and complete the set of the pattern of optical element shapes into the sheet while the sheet is in a flat configuration. - In
block 78 the belt separates from the sheet after completing the set of the pattern of optical element shapes into the sheet. - The orientation of the extrusion-to-sheet production line is merely exemplary and different orientations can be used. For example, the line can be inverted so that the embossed sheet exits the line at an area above the area through which the continuously-extruded sheet of molten plastic material enters the line or the line can be rotated through a suitable angle.
- In this disclosure, the phrase “one of” followed by a list is intended to mean the elements of the list in the alternative. For example, “one of A, B and C” means A or B or C. The phrase “at least one of” followed by a list is intended to mean one or more of the elements of the list in the alternative. For example, “at least one of A, B and C” means A or B or C or (A and B) or (A and C) or (B and C) or (A and B and C).
- Although this disclosure has described certain embodiments, equivalent alterations and modifications will become apparent upon the reading and understanding of the specification. In particular, with regard to the various functions performed by the above-described components, the terms used to describe such components are intended to correspond, unless otherwise indicated, to any component which performs the specified function of the described component (e.g., that is functionally equivalent), even though not structurally equivalent to the exemplary embodiments. In addition, while a particular feature may have been disclosed with respect to only one embodiment, such feature may be combined with one or more other features as may be desired and advantageous for any given or particular application.
Claims (21)
1. (canceled)
2. An extrusion-to-sheet production line, comprising:
a first roll and a second roll set to a predetermined gap through which a continuously-extruded sheet of molten plastic material passes;
a heated third roll;
a continuous belt looped around the third roll and a fourth roll spaced apart from the third roll, the belt comprising an embossing pattern that is an inverse pattern of a pattern of optical element shapes to be embossed at a first major surface of the sheet, wherein the second roll and the belt at a closest point between the second roll and the third roll form a nip that transfers the pattern of optical element shapes on the belt to the first major surface of the sheet; and
a separation area where the belt separates from the sheet after completing the transfer of the pattern of optical element shapes into the sheet.
3. The extrusion-to-sheet production line of claim 2 , additionally comprising a pressure roller downstream of the nip for pressing the sheet against the embossing pattern on the belt.
4. The extrusion-to-sheet production line of claim 2 , wherein the optical element shapes of the pattern that are set into the sheet are micro-optical element shapes.
5. The extrusion-to-sheet production line of claim 2 , wherein the optical element shapes of the pattern that are set into the sheet are lenticular or prismatic.
6. The extrusion-to-sheet production line of claim 2 , wherein the first roll and the second roll are cooled.
7. The extrusion-to-sheet production line of claim 2 , wherein the second roll is heated.
8. The extrusion-to-sheet production line of claim 2 , additionally comprising a supply reel and a guide roller for superimposing a carrier film into direct contact with a second major surface of the sheet.
9. The extrusion-to-sheet production line of claim 8 , additionally comprising a pressure roller downstream of the nip for pressing the sheet against the embossing pattern on the belt.
10. The extrusion-to-sheet production line of claim 9 , wherein the supply reel and the guide roller are arranged to superimpose the carrier film into direct contact with the second major surface of the sheet upstream of the pressure roller.
11. The extrusion-to-sheet production line of claim 8 , wherein a surface of the carrier film that is superimposed into direct contact with the second major surface of the sheet comprises an embossing pattern that is an inverse pattern of a pattern of optical element shapes to be embossed at the second major surface of the sheet.
12. The extrusion-to-sheet production line of claim 8 , wherein a surface of the carrier film that is superimposed into direct contact with the second major surface of the sheet has a smooth finish.
13. The extrusion-to-sheet production line of claim 2 , additionally comprising a cooling area downstream of the third roll and upstream of the separation area through which the belt passes while the first major surface of the sheet is still in contact with the embossing pattern on the belt for cooling the sheet and completing the set of the pattern of optical element shapes.
14. The extrusion-to-sheet production line of claim 13 , additionally comprising a pressure roller downstream of the nip and upstream of the cooling area for pressing the sheet against the embossing pattern on the belt.
15. The extrusion-to-sheet production line of claim 2 , additionally comprising a gap die through which the sheet of molten plastic material is extruded into the gap between the first roll and the second roll.
16. A method, comprising:
passing an extruded sheet of molten plastic material between a first roll and a second roll set to a predetermined gap to calender the sheet to a thickness;
passing the sheet through a nip formed between the second roll and a belt looped around a heated third roll and a fourth roll spaced apart from the third roll, the nip being where the belt is at a closest point between the second roll and the third roll, the belt comprising an embossing pattern that is an inverse of a pattern of optical element shapes to be embossed at a first major surface of the sheet, where the pattern of optical element shapes on the belt is embossed into the first major surface of the sheet;
separating the belt from the sheet after setting the pattern of optical element shapes into the sheet.
17. The method of claim 16 , additionally comprising passing the belt through a cooling area downstream of the third roll while the first major surface of the sheet is still in contact with the embossing pattern on the belt to cool the sheet and set the pattern of optical element shapes into the sheet.
18. The method of claim 16 , additionally comprising maintaining the second roll at a temperature such that the sheet remains above the glass transition temperature of the plastic material upstream of the nip.
19. The method of claim 16 , additionally comprising superimposing a carrier film into direct contact with a second major surface of the sheet downstream of the nip.
20. The method of claim 19 , additionally comprising transferring a finish shape on a surface of the carrier film that is superimposed into direct contact with the second major surface of the sheet onto the second major surface of the sheet during pressing of the carrier film against the sheet.
21. The method of claim 19 , wherein a surface of the carrier film that is superimposed into direct contact with the second major surface of the sheet has a smooth finish.
Priority Applications (1)
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US15/619,708 US20180036937A1 (en) | 2012-03-09 | 2017-06-12 | Extrusion-to-sheet production line and method |
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US201261608686P | 2012-03-09 | 2012-03-09 | |
US13/772,613 US9296146B1 (en) | 2012-03-09 | 2013-02-21 | Extrusion-to-sheet production line and method |
US15/047,673 US9701060B2 (en) | 2012-03-09 | 2016-02-19 | Extrusion-to-sheet production line and method |
US15/619,708 US20180036937A1 (en) | 2012-03-09 | 2017-06-12 | Extrusion-to-sheet production line and method |
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US15/047,673 Continuation US9701060B2 (en) | 2012-03-09 | 2016-02-19 | Extrusion-to-sheet production line and method |
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US20180036937A1 true US20180036937A1 (en) | 2018-02-08 |
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US13/772,613 Expired - Fee Related US9296146B1 (en) | 2012-03-09 | 2013-02-21 | Extrusion-to-sheet production line and method |
US15/047,673 Expired - Fee Related US9701060B2 (en) | 2012-03-09 | 2016-02-19 | Extrusion-to-sheet production line and method |
US15/619,708 Abandoned US20180036937A1 (en) | 2012-03-09 | 2017-06-12 | Extrusion-to-sheet production line and method |
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US13/772,613 Expired - Fee Related US9296146B1 (en) | 2012-03-09 | 2013-02-21 | Extrusion-to-sheet production line and method |
US15/047,673 Expired - Fee Related US9701060B2 (en) | 2012-03-09 | 2016-02-19 | Extrusion-to-sheet production line and method |
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Families Citing this family (9)
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KR20170091683A (en) * | 2014-12-04 | 2017-08-09 | 미츠비시 가스 가가쿠 가부시키가이샤 | Functional sheet including polyester resin, and lens using functional sheet |
TWI640554B (en) * | 2016-11-28 | 2018-11-11 | 林紫綺 | Isothermal extrusion molding system and isothermal roller structure thereof |
US11110500B2 (en) | 2016-11-28 | 2021-09-07 | Tzu-Chi LIN | Uniform temperature roller system having uniform heat exchange by supercritical fluid |
US10695971B2 (en) * | 2018-01-15 | 2020-06-30 | Ting Yi LIOU | Plastic flooring having registration system |
CN109834923B (en) * | 2019-03-22 | 2021-09-10 | 胡岚君 | Reduce artifical material loading cost's high-efficient type plastic board knurling equipment |
CN211222117U (en) * | 2019-09-16 | 2020-08-11 | 南京贝迪电子有限公司 | Production equipment for prism light guide film |
CN111571905A (en) * | 2020-05-29 | 2020-08-25 | 成都阿茂芙科技有限公司 | PET plastic sheet extrusion production line |
CN111716780A (en) * | 2020-06-12 | 2020-09-29 | 杭州西奥电梯有限公司 | Production equipment and process and elevator traction belt produced by production equipment |
DE102020120395A1 (en) * | 2020-08-03 | 2022-02-03 | Surteco Gmbh | Process for manufacturing an add-on bar |
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US3756760A (en) * | 1971-11-08 | 1973-09-04 | Hallmark Cards | Finishing roll for extruded plastic sheet |
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DE3573649D1 (en) | 1984-07-02 | 1989-11-16 | Mitsubishi Rayon Co | Light diffuser |
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JP2538667B2 (en) | 1989-04-13 | 1996-09-25 | 富士通株式会社 | Backlight |
US5057974A (en) | 1990-06-22 | 1991-10-15 | Tatsuji Mizobe | System for uniformly illuminating liquid crystal display board from rear side |
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US6200399B1 (en) | 1999-01-14 | 2001-03-13 | Avery Dennison Corporation | Method and apparatus for embossing a precision pattern of micro-prismatic elements in a resinous sheet or laminate |
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2013
- 2013-02-21 US US13/772,613 patent/US9296146B1/en not_active Expired - Fee Related
-
2016
- 2016-02-19 US US15/047,673 patent/US9701060B2/en not_active Expired - Fee Related
-
2017
- 2017-06-12 US US15/619,708 patent/US20180036937A1/en not_active Abandoned
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US20160311150A1 (en) | 2016-10-27 |
US9701060B2 (en) | 2017-07-11 |
US9296146B1 (en) | 2016-03-29 |
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Owner name: RAMBUS INC, CALIFORNIA Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:THIELMAN, W. SCOTT;REEL/FRAME:043812/0658 Effective date: 20120618 Owner name: RAMBUS DELAWARE LLC, OHIO Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:RAMBUS INC;REEL/FRAME:044149/0688 Effective date: 20130301 |
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