US3376371A - Continuous casting process - Google Patents

Continuous casting process Download PDF

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Publication number
US3376371A
US3376371A US490945A US49094565A US3376371A US 3376371 A US3376371 A US 3376371A US 490945 A US490945 A US 490945A US 49094565 A US49094565 A US 49094565A US 3376371 A US3376371 A US 3376371A
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Prior art keywords
belts
composition
rollers
belt
fluid
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Expired - Lifetime
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US490945A
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English (en)
Inventor
Charles J Opel
Paul H Bottoms
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
GKN Aerospace Transparency Systems Inc
Original Assignee
Swedlow Inc
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Application filed by Swedlow Inc filed Critical Swedlow Inc
Priority to US490945A priority Critical patent/US3376371A/en
Priority to GB42039/66A priority patent/GB1168084A/en
Priority to NO164824A priority patent/NO136399C/no
Priority to AT899266A priority patent/AT310441B/de
Priority to BE687405D priority patent/BE687405A/xx
Priority to SE12927/66A priority patent/SE312427B/xx
Priority to DK499666AA priority patent/DK124384C/da
Priority to NL6613600A priority patent/NL6613600A/xx
Priority to CH1390266A priority patent/CH463090A/de
Priority to ES0331636A priority patent/ES331636A1/es
Priority to DE19661645388 priority patent/DE1645388A1/de
Priority to JP41063524A priority patent/JPS4936944B1/ja
Priority to FR78064A priority patent/FR1500417A/fr
Publication of US3376371A publication Critical patent/US3376371A/en
Application granted granted Critical
Priority to ES341824A priority patent/ES341824A1/es
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J19/18—Stationary reactors having moving elements inside
    • B01J19/22—Stationary reactors having moving elements inside in the form of endless belts
    • 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
    • B29C39/00—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor
    • B29C39/14—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor for making articles of indefinite length
    • B29C39/16—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor for making articles of indefinite length between endless belts
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F2/00—Processes of polymerisation
    • C08F2/02—Polymerisation in bulk
    • 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
    • B29C37/00—Component parts, details, accessories or auxiliary operations, not covered by group B29C33/00 or B29C35/00
    • B29C37/005—Compensating volume or shape change during moulding, in general
    • 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
    • B29K2105/0002—Condition, form or state of moulded material or of the material to be shaped monomers or prepolymers

Definitions

  • the present invention relates to the continuous casting of polymeric compositions. There has been substantial interest in casting polymeric compositions for many years and many processes have been proposed and developed for such casting. Much of this development work has concerned the casting of acrylic and other polymerizable unsaturated organic materials.
  • the casting processes which have been previously developed comprise subjecting the polymerizable compositions to heat and/or light with or without the application of pressure.
  • a highly successful and widely used process comprises casting liquid monomer between a pair of rigid sheets which sheets are provi-ded with a peripheral gasket of exible material to compensate for the shrinkage which occurs during polymerization, the assembly being immersed in a hot water bath or hot air oven for the length of time required to carry out the thermal polymerization.
  • the hot water bath is, of course, the source of both heat and pressure. This process has come to be known as cell casting.
  • Cell casting is, as is apparent from the foregoing description, a batch process and, although widely used, is subject to all of the deficiencies of any batch process, viz, a substantial amount of down time between casting operations, size limitations, quality control diiculties due to inadvertent changes in pressure, temperature and composition, etc.
  • the present invention obviates the foregoing and other diiiculties which have been inherent in the continuous casting processes previously proposed and makes possible, for the rst time, continuous casting of acrylic and other polymerizable monomers in a manner which is suitable for commercial use and which produces a product having acceptable characteristics.
  • It is another object of the present invention to provide a process for continuous casting of acrylic and other polymerizable monomers comprising a pair of moving endless belts which are inclined in such a manner that the pressure of the materials between the belts is suflicient to maintain the spacing between them at a desired predetermined distance.
  • the apparatus used in the method of the present invention comprises a pair of endless belts mounted on rollers in such a manner that the lower run of the upper belt is substantially parallel to the upper run of the lower belt for a substantial portion of their lengths.
  • These belts are arranged such that the lower run of the upper belt and the upper run of the lower belt are inclined at an angle to the horizontal.
  • each of the belts is caused to move ⁇ around its supporting rollers such that ythe lower run of the upper belt and the upper run of the lower belt move in the same direction, and such that there is substantially no relative movement between the lower run of the upper ibelt and the upper run of the lower belt.
  • Liquid polymerizable monomer is fed to the intake ends of these belts and is passed through at least one heating station.
  • a liquid acrylic monomer composition is fed into l'the casting apparatus and is lirst heated -to a sufficient extent to cause the monomer to polymerize (or cure) and is then subjected to a further heating step to postcure the polymerized composition.
  • the initial heating step may be performed by heating with hot air, by causing the moving belts to pass through a zone which is llooded with hot water or, preferably, may be accomplished Iby spraying hot Water on the external surface of the moving belts.
  • the critical requirement of the apparatus and process of the present invention is that the angle of inclination to the hori zontal of the belts be such that a pressure head of the liquid monomer is developed which is suicient to maintain the spacing ybetween the bel-ts and the desired distance until the liquid has polymerized.
  • the inclined path of the moving belts may be a str-aight line or, as claimed in copending application Ser. No. 490,897, led on the same date as the present application in the name of Hellsund, and assigned to the assignee of the present application, these belts may follow a curved path which is defined by the natural curvature of the belts.
  • FIGURE la illustrates a portion of an embodiment of the present invention 3 wherein the path defined by the moving belts is the natural curvature of these belts.
  • FIGURE 1b illustrates the remainder of the apparatus illustrated in FIGURE la.
  • FIGURE 2 is a vertical cross-section taken on line 2-2 of FIGURE 1a which illustrates the spray means used as -a source of heating medium.
  • FIGURE 3 is a vertical crosssection taken on line 3-3 of FIGURE 2 which illustrates a -side view of the t spray means and moving belts.
  • FIGURE 4 is a ventical cross-section taken on line 4 4 of FIGURE lb and shows the moving belts passing through the postcuring oven.
  • FIGURE 5 is a vertical cross-section taken on line 5-5 of FIGURE 4 and illustrates a side view of the moving belt passing through the postcuring oven.
  • FIGURE 6 illustrates another embodiment of the present invention wherein the path of the moving belt is a straight line which is inclined to the horizontal.
  • FIGURE 7 is a vertical cross-section taken on line 7 7 of FIGURE 6 and illustrates the water looding heating means which may be used in the present invention.
  • one embodiment of the apparatus used in the method of the present invention comprises an upper belt 11 which is positioned above a lower belt 12.
  • Upper belt 11 is supported on rollers 13 and 14 while lower belt 12 is supponted on rollers 15, 16, 17.
  • lower belt 12 is somewhat longer than upper belt 11 so as to provide exposed area 18 which serves as a convenient means for feeding liquid monomer between rollers 13 and 16.
  • Support posts 19' which are provided with rollers and rollers 21 provide additional support for the belts 11 and 12.
  • Roller 14 is mounted on movable support 22 and support 22 is in turn connected to piston 23.
  • rollers 14 and 17 are driven by motor 26 .through chains 27 and 28.
  • FIGURES la and lb are also illustrated in FIGURES la and lb.
  • the housing 29 for the spray means which are used to provide lthe heat for polymerization of the monomer and housing 30 of the postcuring oven. These heating means are illustrated in more detail in FIGURES 2-5.
  • housing 29 encloses a series of spray means some of which are positioned above the lower run of the upper belt as indicated generally by numeral 31 and some of which are positioned below the upper run of the lower belt and are indicated generally by numeral 32.
  • -spray nozzles 33 are so constructed such that a square pattern is sprayed by each nozzle on belts 11 and 12 in the manner indicated by the broken lines emanating from each nozzle 33.
  • Each of the nozzles 33 is mounted on one of pipes 34 and the pipes 34 are connected to conduits 35.
  • Conduits 35 are connected to a source of hot water or other suitable liquid (not shown).
  • housing 29 is provided with a supporting gusset 36. Gaskets 50 and y51 are also provided between belts 11 Aand 12 to prevent leakage of the polymerizable composition.
  • rollers 37 are provided above the lower run of belt 11 and a desired inclined path which is generally parallel to belt 12. Furthermore, since shrinkage generally occurs during polymerization, this shrinkage must be compensated for by causing belts 11 and 12 to assume a path which converges to the same extent as the decrease in thickness caused by polymerization shrinkage. Preferably, this may be accomplished by providing spring-loaded mountings for rollers 37, such as those shown in FIGURE 7 for rollers 77, or any other suitable means may be used such las adjustable mountings. Rollers 37 and 38 are preferably arranged such that they form a square pattern, i.e., such that each roller is equidistant from its adjacent rollers in both the lateral and longitudinal direction.
  • housing 29 is constructed in sections, two of which are indicated generally by numerals 39 and 40 in FIGURE 3. Each of these sections is supported at one end by support member 19 and at the other end by support member 41 as seen most clearly in FIGURE la. As shown in FIGURE 3, the exit end of each section is provided t with wiper means 42 and 43 which substantially prevent the water or other liquid on the surfaces of belts 11 and 12 from leaving section 39. ⁇
  • housing 30 is adjacent to the last section of housing 29 and wiper means 44 and ⁇ 45 are provided to substantially prevent the water or other liquid on the surfaces of belts 11 and 12 from entering housing 1 30.
  • a series of upper rollers 46 and a series of lower rollers 47 are also provided in housing 30 to supportfbelts 11 and 12 in much the sarne manner as rollers 37 and 38 in housing 29.
  • rollers 46 and 47 are so arranged i that the belts 11 and 12 assume a converging path in order product.
  • rollers 46 are spring mounted in order to compensate yfor the shrinkage which might occur during post-curing. If the product shrinks away from the belts,
  • rollers 46 are spring mounted in order to urge belt 11 toward Ibelt 12 and thereby compensate for the shrinkage. It is also preferred to provide rollers 38 and 47 with fixed mountings. Housing 30 may might remain on the surface of belts 11 and 12 and may comprise any conventional means such as spray means, rotating brushes, solvent solution, etc. It is, of course, desirable to remove any deposits which may be present on the surfaces of belts 11 and 12 since such deposits would otherwise result in the formation of irregularities on the surface of the cast sheet.
  • endless belts 50 and 51 are arranged such that the path of the lower run of belt 50 and the upper lun of 51 is a substantially straight line which is inclined to the horizontal.
  • roller 50 is mounted on rollers 52 and 53 while belt 51 is mounted on rollers 54 and 55.
  • Roller 52 is preferably adjustably mounted as illustrated in FIGURE 6 such that screw 56 may be used to adjust the position of axle 57 in mounting 58 to thereby adjust the tension exerted by rollers 52 and 53 on belt 50.
  • Roller 54 is similarly preferably ⁇ adjustably mounted such that screw 59 ⁇ may be used to adjust the position of axle 60 in mounting 61 to adjust the tension exerted on belt 51.
  • Rollers 53 and 55 are driven by motor 62 through chains 63 and 64.
  • FIGURES 6 and 7 a water flooding means which may be used as an alternative heating means is illustrated in FIGURES 6 and 7.
  • This water flooding heating means comprises an upper water inlet pipe 65 which branches into feeder pipe 66 which feeder pipe in turn branches into a pair of delivery pipes 68.
  • delivery pipes 68 deliver hot water to the inlet end of the upper portion of the heating means.
  • hot water is supplied to the inlet end of the lower portion of the water flooding means by pipe 70.
  • Pipe 70 is surrounded by housing 72 which is provided with front and back walls 73 and 74.
  • Rollers 77 are provided above the lower run of belt 50 and rollers 78 are provided below the upper run of belt 51. As explained with regard to rollers 37 and 38, rollers 77 function to support belt 51 while rollers 77 maintain belt 51 in the desired position and exert pressure on the material being cast. Rollers 77 are illustrated as being spring loaded in FIGURE 7 such that springs 79 urge these rollers toward belt 50. However, rollers 77 may also be provided with a fixed mounting.
  • a postcuring means which is indicated generally by numeral 80 is also illustrated in FIGURE 6.
  • the postcuring means comprises a conventional forced air heating system.
  • rollers 86 and 81 are mounted such that the shrinkage which occurs during postcuring is compensated for by causing the belts 50 and 51 to assume a converging path.
  • this is accomplished by providing rollers 86 with a spring loaded mounting while providing rollers 81 with a fixed mounting.
  • IRollers 7 S are preferably provided with a fixed mounting as illustrated in FIGURE 7.
  • gaskets 82 and 83 may be provided. Gaskets 82 and 83 may travel at substantially the same speed as belts 50 and 51 and thus provide a dynamic side seal for the material being cast.
  • FIG- URES 1-5 The operation of the apparatus illustrated in FIG- URES 1-5 and the apparatus illustrated in FIGURES 6 and 7 are similar in many respects.
  • a fluid composition comprising a polymerizable organic monomer is fed to the inlet end of the casting apparatus and is polymerized while being carried between the moving belts which are substantially parallel for a large portion of the time during which they are in contact with the composition being polymerized and cast.
  • These belts have substantially no relative motion during the time they are in contact with the composition being polymerized and cast and are inclined at an angle to the horizontal.
  • this angle of inclination will depend upon the viscosity of the composition being polymerized, the polymerization conditions, the length of the belts and other factors. However, given the principles of the present invention, only routine experimentation is required to determine that angle of inclination which will be sufficient to maintain the desired spacing between the moving belts by means of the uid pressure being exerted by the material being polymerized. In general, it has been found that this angle may vary from about 0.5 to about 5.0.
  • the configuration of the curved path defined by the lower belt will be the natural sag or natural curvature of these belts.
  • natural curvature means that curvature which a given belt would assume when the ends thereof are supported at a given height under a given tension. It has been found preferable to calculate the natural curvature for a given tension and to arrange support rollers 37 and 38 such that they assume the path of this natural curvature and then to hold the upper belt under greater tension than the given tension and the lower belt under less tension than the given tension such that the tension on the upper belt tends to ⁇ pull the lower run thereof against rollers 37 and the upper run of the lower belt can relax against rollers 38.
  • the stainless steel belts which are held under a tension of about 5100 p.s.i. for the lower belt and 7000 p.s.i. for the upper belt, these being somewhat less than maximum tension, maximum tension being defined as the greatest tension to which the belts may be subjected without reaching the yield point.
  • the concept of natural curvature and the methods of calculating this curvature are known to those skilled in the art and, as such, do not form a part of the present invention. For example, these considerations are discussed in The Sandvik Steel Band Conveyor Handbook published in 1956 by The Sandvik Steel Works Co. Ltd., which is incorporated by reference herein.
  • the curved incline of the belts extends over only a portion of their path between the rollers.
  • the path of the belts is substantially horizontal from a point shortly before they enter the postcuring unit housing 30 until they reach rollers 14 and 17 and the curved path extends between the last section of the housing 29 and rollers 13 and 16.
  • the curved portion of this path is tangent to the horizontal portion and this relationship taken with the length of the path between rollers 13 and 16 and the horizontal portion plus the natural curvature of the belts under a given tension will determine the vertical distance above rollers 14 and 17 to which rollers 13 and 16 must be raised.
  • compositions which may be cast according to the present invention may be various types of liquids including monomeric compounds in the liquid state, preferably when at normal atmospheric pressure, partially polymerized monomeric compounds and solutions of soluble polymeric resins in monomeric compounds.
  • pastes may be employed including mixtures of liquid monomeric and solid polymeric organic compounds which are at least partially soluble in the monomeric compounds.
  • the liquids and pastes used in the present invention may ⁇ contain plasticizers such as tricresyl phosphate or dibutyl phthalate; fillers such as iinely divided inorganic materials; reinforcing materials such as fabrics, glass fibers, wire, etc.; dyes and pigments, providing that these materials do not prevent the polymerization of the monomeric compounds contained in these mixtures.
  • the monomeric material may also contain a parting agent to facilitate separation of the belts from the cast product and polymerization catalyst such as benzoyl peroxide or acetyl peroxide.
  • Patterned or contoured surfaces may be produced on the cast sheet by providing a matrix having a surface which is the negative of that desired on the surface of the cast sheet between one or both of the moving belts and the composition being cast.
  • This matrix may be attached to the surface of the moving belt or may be mounted on separate rollers operated at such a speed so as to move the matrix material at substantially the same linear speed as that ofthe moving belts.
  • Example I A viscous syrup comprising 98% methyl methacrylate, 0.5% laurcyl peroxide (catalyst), .000l% Zelec (parting agent), 0.5% ethylene glycol dimethacrylate and 0.05% Tinuvin P (ultraviolet absorber) is fed to the inlet end of an apparatus of the type illustrated in FIGURES 1a and lb.
  • the length of the curved portion of the path of these belts is approximately 135 feet while the length of the horizontal portion of these belts is approximately 30 feet.
  • the vertical distance between the top and bottom of the curved portion is 6 feet.
  • the belts are 54 inches wide.
  • the temperature in housing 29 is maintained at 160 F.
  • the speed of the belts is 3 feet per minute.
  • the belts are set 1A; inch apart to produce a cast sheet having a thickness of approximately Ms inch. These sheets are transparent, have extremely smooth surfaces, are free from internal voids or bubbles and are substantially free from internal strain.
  • the belts used were fabricated from ⁇ highly polished stainless steel.
  • Example -II the upper belt in such a manner as to maintain a constant spacing of 1/s inch between the belt.
  • the monomeric material was first exposed to a temperature of 150 F. in the water flooding zone to cure the monomeric syrup and was then subjected to a temperature of 250 F. in the hot air oven to postcure the cast sheet.
  • a process for preparing substantially rigid sheets and the like which comprises passing a tiuid composition comprising a polymerizable organic monomer between and in contact with two moving surfaces, providing a pair of seals between said surfaces such that said uid composition is confined in a space bounded on -two oppoing sides by said seals, allowing said uid to lill the cavity defined by said surfaces and said seals, passing said composition and moving surfaces through at least one zone in which said composition is subjected to conditions which cause said monomer to polymerize, one of said surfaces being disposed above the other of said surfaces in said zone, said upper surface being of such a size and weight that it would bow downwardly into said uid and toward said second surface if said surfaces were 8 horizontal in said zone, maintaining the path of said surfaces through said zone at anincline to the horizontal to cause a uid head to be developed by said fluid composition, said incline being sufficient for the fluid -pres sure between said surfaces to maintain said surfaces substantially parallel to each other and the spacing
  • a process for preparing substantially rigid ⁇ sheets and the like which comprises passing a fluid composition comprising a polymerizable organic monomer between and in contact with two moving surfaces, providing a pair of seals between said surfaces such that said fluid composition is confined in a space bounded on two opposing sidesby said seals, allowing said uid to fill the cavity de- ⁇ fined by said surfaces and said seals, passing said moving surfaces and said composition through a first heating zone, heating said monomer to an extent sufficient to cause polymerization thereof in said, first heating zone, one of said surfaces being disposed above the other of said surfaces in said zone, said ⁇ upper surface being of such a size and weight that it would bow downwardly into said uid and toward said second surface if said surfaces were horizontal in said zone, ⁇ maintaining the path of said surfaces through said first zone ⁇ being at an incline to the horizontal to cause a fluid head to be developed by said fluid composition, said incline being sufficient for the fluid pressure exerted by said fluid composition between said surfaces to maintain said

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Polymerisation Methods In General (AREA)
  • Closing Of Containers (AREA)
  • Moulding By Coating Moulds (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
US490945A 1965-09-28 1965-09-28 Continuous casting process Expired - Lifetime US3376371A (en)

Priority Applications (14)

Application Number Priority Date Filing Date Title
US490945A US3376371A (en) 1965-09-28 1965-09-28 Continuous casting process
GB42039/66A GB1168084A (en) 1965-09-28 1966-09-20 Continuous Casting Process and Apparatus
NO164824A NO136399C (no) 1965-09-28 1966-09-21 Fremgangsm}te og apparat for kontinuerlig st¦ping av stive plastplater, s{rlig polymetylmetakrylatplater
AT899266A AT310441B (de) 1965-09-28 1966-09-26 Verfahren zur kontinuierlichen Herstellung von Platten od.dgl. aus polymerisierbaren Kunststoffen
BE687405D BE687405A (xx) 1965-09-28 1966-09-26
SE12927/66A SE312427B (xx) 1965-09-28 1966-09-26
CH1390266A CH463090A (de) 1965-09-28 1966-09-27 Verfahren und Vorrichtung zur Herstellung praktisch harter Platten und Folien
NL6613600A NL6613600A (xx) 1965-09-28 1966-09-27
DK499666AA DK124384C (da) 1965-09-28 1966-09-27 Fremgangsmåde til kontinuerlig støbning af stive formstofplader, især polymethylmethacrylatplader, og apparat til udøvelse af fremgangsmåden.
ES0331636A ES331636A1 (es) 1965-09-28 1966-09-27 Un procedimiento para preparar planchas y estructuras similares, esencialmente rigidas.
DE19661645388 DE1645388A1 (de) 1965-09-28 1966-09-27 Verfahren und Einrichtung zum fortlaufenden Giessen
JP41063524A JPS4936944B1 (xx) 1965-09-28 1966-09-28
FR78064A FR1500417A (fr) 1965-09-28 1966-09-28 Procédé et dispositifs de coulée continue de polymères, notamment pour l'obtention de produits rigides
ES341824A ES341824A1 (es) 1965-09-28 1968-06-15 Un aparato para moldeo continuo de polimeros.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US490945A US3376371A (en) 1965-09-28 1965-09-28 Continuous casting process

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US3376371A true US3376371A (en) 1968-04-02

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US490945A Expired - Lifetime US3376371A (en) 1965-09-28 1965-09-28 Continuous casting process

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US (1) US3376371A (xx)
JP (1) JPS4936944B1 (xx)
AT (1) AT310441B (xx)
BE (1) BE687405A (xx)
CH (1) CH463090A (xx)
DE (1) DE1645388A1 (xx)
DK (1) DK124384C (xx)
ES (2) ES331636A1 (xx)
FR (1) FR1500417A (xx)
GB (1) GB1168084A (xx)
NL (1) NL6613600A (xx)
NO (1) NO136399C (xx)
SE (1) SE312427B (xx)

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2170931A2 (en) * 1972-02-03 1973-09-21 Berte Joseph Continuous cast polyurethane films mfr - using an anti adhesion varnish
US3852387A (en) * 1970-04-24 1974-12-03 James W White Double belt plastic sheet forming and take-off method
US3872197A (en) * 1968-12-30 1975-03-18 Mitsubishi Rayon Co Process and an apparatus for continuously casting a sheet and the like
US4046850A (en) * 1973-10-25 1977-09-06 Sumitomo Chemical Company, Limited Continuous casting of a polymerizable composition between moving endless belts
US4089918A (en) * 1974-12-25 1978-05-16 Sumitomo Chemical Company, Limited Process for the continuous casting of liquid polymerizable compositions
US4133861A (en) * 1973-01-18 1979-01-09 Mitsubishi Rayon Co., Ltd. Process for continuous manufacture of methyl methacrylate polymer plate
US4211742A (en) * 1976-07-20 1980-07-08 Sumitomo Chemical Company, Limited Process for the continuous casting of liquid polymerizable compositions
US4828784A (en) * 1985-12-21 1989-05-09 Ucb S.A. Method of producing a layer of plastics material between two glass panes and apparatus for performing the method
US5308425A (en) * 1992-10-22 1994-05-03 Aristech Chemical Corporation Method of making crosslinked acrylic sheet with enhanced vacuum molding attributes
US5372493A (en) * 1993-05-13 1994-12-13 Rodgers; Gary C. Continuous casting apparatus using two moving belts
US5415931A (en) * 1990-08-27 1995-05-16 Aristech Chemical Corporation Acrylic-filled thermoformable acrylic sheet
WO1998017713A1 (en) * 1996-10-21 1998-04-30 Aristech Chemical Corporation Process for making a mineral filled acrylic sheet having a matte finish with improved stain resistance
WO1998023426A1 (de) * 1996-11-27 1998-06-04 Polytech Klepsch & Co. Gmbh Vorrichtung zum herstellen von formteilen
EP0958877A2 (en) 1998-04-23 1999-11-24 Premark RWP Holdings, Inc. Apparatus for slicing off sheets containing polymeric particles with a dimension greater than thickness of the sheet
US20070090559A1 (en) * 2002-12-24 2007-04-26 Lg Chem, Ltd. Method for continuously producing artificial marble and apparatus therefor
WO2009000007A1 (de) * 2007-06-27 2008-12-31 Berndorf Band Gmbh Vorrichtung zum kontinuierlichen polymerisieren

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2500728A (en) * 1943-12-17 1950-03-14 Ici Ltd Production of polymeric resin sheets by continuously polymerizing monomeric material
US2958096A (en) * 1957-10-30 1960-11-01 Goodrich Co B F Method and apparatus for continuously curing plastic material

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2500728A (en) * 1943-12-17 1950-03-14 Ici Ltd Production of polymeric resin sheets by continuously polymerizing monomeric material
US2958096A (en) * 1957-10-30 1960-11-01 Goodrich Co B F Method and apparatus for continuously curing plastic material

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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Publication number Publication date
NO136399B (xx) 1977-05-23
CH463090A (de) 1968-09-30
FR1500417A (fr) 1967-11-03
ES341824A1 (es) 1968-12-01
JPS4936944B1 (xx) 1974-10-04
NO136399C (no) 1977-08-31
DK124384C (da) 1973-03-12
BE687405A (xx) 1967-03-28
DK124384B (xx) 1972-10-16
NL6613600A (xx) 1967-03-29
DE1645388A1 (de) 1970-10-22
SE312427B (xx) 1969-07-14
GB1168084A (en) 1969-10-22
ES331636A1 (es) 1967-11-16
AT310441B (de) 1973-09-25

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