CN1860013A - Thick flat-plate molded product and method of producing the same - Google Patents
Thick flat-plate molded product and method of producing the same Download PDFInfo
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- CN1860013A CN1860013A CNA2004800283293A CN200480028329A CN1860013A CN 1860013 A CN1860013 A CN 1860013A CN A2004800283293 A CNA2004800283293 A CN A2004800283293A CN 200480028329 A CN200480028329 A CN 200480028329A CN 1860013 A CN1860013 A CN 1860013A
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- plate molded
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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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/72—Heating or cooling
- B29C45/73—Heating or cooling of the mould
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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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/37—Mould cavity walls, i.e. the inner surface forming the mould cavity, e.g. linings
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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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/72—Heating or cooling
- B29C45/73—Heating or cooling of the mould
- B29C2045/7343—Heating or cooling of the mould heating or cooling different mould parts at different temperatures
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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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/37—Mould cavity walls, i.e. the inner surface forming the mould cavity, e.g. linings
- B29C45/372—Mould cavity walls, i.e. the inner surface forming the mould cavity, e.g. linings provided with means for marking or patterning, e.g. numbering articles
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- 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
- B29L2011/00—Optical elements, e.g. lenses, prisms
Abstract
A rectangular thick flat-plate molded product, produced by injection molding, including a thermoplastic resin and a method of producing the molded product are provided. In the molded product, the difference between the maximum thickness and the minimum thickness is equal to or smaller than 3% of the thickness of the central portion, the thickness from the central portion to a peripheral edge is uniform and even, a fine recess-ridge pattern on the surface of a metal die can be accurately transferred to the product, and the molded product can be suitably used as an optical material. In the method of producing the molded product by injection molding, a metal die is heated so that the temperature of at least a pair of two opposed end sides of a rectangular cavity of the metal die is maintained higher by 2 DEG C or more than the maximum temperature of the central portion of the cavity of the metal die.
Description
Technical field
The present invention relates to thick flat-plate molded product and manufacture method thereof.Say in further detail, the present invention relates to from central portion to the brim-portion thickness homogeneous and do not have deviation, the micro concavo-convex pattern on roller mould surface correctly, and be suitable for thick flat-plate molded product and the manufacture method thereof used as optical material.
Background technology
The injection mo(u)lding product are used in the broad range from commonly used to accurate purposes such as commodity, automobile component, household electrical appliances parts, electronic unit, optical instrument.Whether good whether the quality of injection mo(u)lding product and productivity well are subjected to about mould institute to a great extent.In the making of injection mo(u)lding product, all require the technology of height aspect all in the homogenization of operating accuracy, quality, productivity etc.The light diffusing sheet of liquid crystal indicator (light Expansion falls apart), LGP (Guide tabula rasa) though etc. at first sight be the flat board of simple shape, practically go up requirement extremely tight flatness must be arranged, and do not have thickness deviation.Even dull and stereotyped so simple shape also is difficult for producing and does not have the injection mo(u)lding of thickness deviation product, there are not the injection mo(u)lding of thickness deviation product in order to make, carried out various trials.
For example, result from the injection molding forming method that the thickness deviation of the scuffing (か じ り) of mould of variation of the skew of the platen depth of parallelism or pull bar ( イ バ) elongation or formed body reduces as making, proposed to regulate the depth of parallelism of stationary platen and movable platen in advance with the state of the temperature that is heated to the platen temperature when being equivalent to actual injection mo(u)lding respectively, thus the temperature (patent documentation 1) when when injection mo(u)lding, making platen maintain the depth of parallelism to regulate., when injection mo(u)lding, owing to power effects such as clamping pressure or injection pressure make die deformation, the occasion of particularly large-scale moulding product is difficult to only realize collimation by the control temperature.In addition, as improving photomagneto disk basal disc equidimension precision and the coarse precision of face, and can improve the injection forming mold of the packed density of formed body, but fixed die and dynamic model have been proposed to have, and before solidifying, the molten resin material in being expelled to the disk inner chamber presses cutting sleeve (カ Star ト ス リ one Block), carry out the airtight of the formation of centre bore and disk inner cavity then simultaneously, then, movable side combination is risen and compress the mould (patent documentation 2) of one-shot forming body once more., also be difficult to reduce the thickness deviation of large-scale rectangular moulding product by such method.In addition, deflection as the mould that can suppress to cause owing to briquetting pressure, and can be suppressed at the land area big slit of generation and produce the mould on glue limit, proposed to be provided with the die injection moulding (patent documentation 3) of a plurality of jet space according to inner chamber number and configuration., though such device is effectively for producing a plurality of moulds, can not be applicable to the mould of only producing 1 large-scale moulding product.
[patent documentation 1] spy opens flat 10-323872 communique (the 2nd page, Fig. 1～2)
[patent documentation 2] spy open flat 6-270208 communique (the 2nd～3 page, Fig. 1)
[patent documentation 3] spy open flat 10-44197 communique (the 2nd page, Fig. 1)
Summary of the invention
The objective of the invention is to, a kind of thick flat-plate molded product and manufacture method thereof are provided, described thick flat-plate molded product does not evenly have deviation from the central portion to the brim-portion thickness, correctly the fine relief pattern on roller mould surface can use as optical material suitably.
The present inventor is in order to solve above-mentioned problem, that furthers investigate found that, when making thick flat-plate molded product by the injection mo(u)lding of thermoplastic resin, the thickness of the marginal portion of thick flat-plate molded product is thicker than the thickness of central portion, therefore, when thick flat-plate molded product is used as the LGP of liquid crystal indicator, produce the part of the different striated of brightness such as open-wire line and blanking bar in the marginal portion of picture, and, the end limit of heating die injection moulding and make it the temperature that keeps higher than the central portion of mould, the difference of the thickness of the thickness of the marginal portion of thick flat-plate molded product and central portion reduces thus, when thick flat-plate molded product is used as the LGP of liquid crystal indicator, marginal portion at picture can not produce open-wire line and blanking bar etc., based on this discovery, so that finished the present invention.
That is, the invention provides:
(1) a kind of thick flat-plate molded product, this thick flat-plate molded product are the rectangular thick flat-plate molded products that thermoplastic resin forms that contains by the injection mo(u)lding manufactured, it is characterized in that, with following formula:
Gap width (ギ ヤ Star プ value)={ (T
MAX-T
MIN)/T
CENTER} * 100 (in above-mentioned formula, T
MAXMaximum ga(u)ge, the T of expression flat-plate molded product
MINMinimum thickness, the T of expression flat-plate molded product
CENTERThe thickness of the central portion of expression flat-plate molded product) gap width of expression is below 3% or 3%;
The thick flat-plate molded product of (2) the 1st records, wherein, gap width is below 1% or 1%;
The thick flat-plate molded product of (3) the 1st or the 2nd record, wherein, the thickness of central portion is 3～50mm;
The thick flat-plate molded product of each record in (4) the 1st～the 3rd, wherein, thermoplastic resin is the resin with ester ring type structure;
The thick flat-plate molded product of each record in (5) the 1st～the 3rd, wherein, thermoplastic resin is methacrylic resin or (methyl) alkyl acrylate-aromatic vinyl copolymer;
The thick flat-plate molded product of each record in (6) the 1st～the 5th, wherein this thick flat-plate molded product is the LGP of liquid crystal indicator; And
The manufacture method of the thick flat-plate molded product of each record in (7) the 1st～the 6th, it is characterized in that, when the thick flat-plate molded product by injection mo(u)lding manufactured thermoplastic resin, heating mould is so that the temperature maintenance on 2 end limits of at least 1 pair relative direction of the rectangle inner chamber of die injection moulding is higher more than 2 ℃ or 2 ℃ than the maximum temperature of the central portion of the inner chamber of mould.
In addition, as preferred mode of the present invention, can enumerate:
The manufacture method of the thick flat-plate molded product of (8) the 6th records, wherein, in 1 molding cycle, the thermal medium that circulates in will the thermal medium stream in mould is converted to the thermal medium of high temperature and the thermal medium of low temperature, thereby the temperature of the central portion of the inner chamber of the mould when making injection moulding uprises, the temperature step-down of the central portion of the inner chamber of the mould when making cooling.
Description of drawings
Fig. 1 is the constructed profile by the thick flat-plate molded product of injection mo(u)lding manufactured, Fig. 2 is the key diagram of the picture of liquid crystal indicator, Fig. 3 is the key diagram of the central portion of thick flat-plate molded product, and Fig. 4 is a kind of key diagram of mode of heating means that the end limit of the inner chamber in the inventive method is shown.Among the figure, symbol 1 is a central portion, the 2nd, and end limit, the 3rd, open-wire line, the 4th, blanking bar, the 5th, inner chamber, the 6th, heater air flow pressure switch rod.
The specific embodiment
Thick flat-plate molded product of the present invention is in the rectangular thick flat-plate molded product of the thermoplastic resin by the injection mo(u)lding manufactured, the difference of maximum ga(u)ge and minimum thickness is below 3% or 3% of central portion thickness, be more preferably below 2% or 2% the thick flat-plate molded product below preferred especially 1% or 1%.The object that is suitable for thick flat-plate molded product of the present invention and manufacture method thereof has no particular limits, can be fit to be used in the large-scale thick flat-plate molded product of the flatness of surface requirements strictnesses such as LGP, light diffusing sheet, reflecting plate, but be particularly suitable for being used in the LGP of liquid crystal indicator.
Fig. 1 is the constructed profile by the thick flat-plate molded product of injection mo(u)lding manufactured.During by injection mo(u)lding manufactured thick flat-plate molded product, can obtain holding the thickness on the limit 2 moulding product thicker than central portion 1.When such moulding product are used as the LGP in the liquid crystal indicator, near the incidence surface of picture, occur as the open-wire line 3 of the wire that brightness that Fig. 2 institute pattern ground illustrates is strong or the blanking bar 4 of the band shape a little less than the brightness etc., make the picture quality reduction.Difference by using maximum ga(u)ge and minimum thickness is the thick flat-plate molded product of the present invention below 3% or 3% of the central portion thickness LGP as liquid crystal indicator, can obtain not having the good picture of exterior quality of open-wire line or blanking bar etc.
In the present invention, the central portion of said thick flat-plate molded product is the intersection of diagonal of rectangular thick flat-plate molded product.When thick flat-plate molded product is not correct rectangle, each limit of its shape prolonged and the rectangular intersection of diagonal that forms as central portion.At this moment, make to reach and prolong each limit minimumly and form rectangle by the gross area that prolongs additional part that each limit forms and deduction part.Fig. 3 is the key diagram of the central portion of thick flat-plate molded product.Shown in 3 examples of this figure, in each example, shown in dotted line, each limit prolonged and form rectangle, for example, shown in the chain-dotted line of the figure of central authorities, do not prolong each limit.
In thick flat-plate molded product of the present invention, the preferred 3～50mm of the thickness of central portion is more preferably 5～20mm.Even the maximum ga(u)ge of the flat-plate molded product of the not enough 3mm of the thickness of central portion and the difference of minimum thickness surpass central portion thickness 3%, also be difficult to produce optic unfavorable conditions such as open-wire line or blanking bar.The thickness of central portion surpasses the thick flat-plate molded product of 50mm, needs the time during owing to cooling, is not very wise move by the injection mo(u)lding manufactured.
The thermoplastic resin that uses among the present invention is not particularly limited, can enumerate, for example, resin, methacrylic resin, Merlon, polystyrene, acrylonitritrile-styrene resin resin, (methyl) acrylate-aromatic vinyl copolymer with ester ring type structure, preferable methyl methyl acrylate-styrene copolymer resin, ABS resin, polyether sulfone etc.In the middle of these, can preferably use resin, methacrylic resin and (methyl) acrylate-aromatic vinyl copolymer, preferred especially the resin that uses with ester ring type structure with ester ring type structure.
Resin with ester ring type structure is because the good fluidity of molten resin, therefore the fine relief pattern of the surface of internal cavity of roller mould correctly, and because hygroscopicity is extremely low, so excellent in dimensional stability, on thick flat-plate molded product, can not produce warpage, because proportion is little, can make large-scale thick flat-plate molded product lightweight.
As resin, can enumerate the fluoropolymer resin that has the ester ring type structure at main chain or side chain with ester ring type structure.Has the fluoropolymer resin of ester ring type structure because mechanical strength and hear resistance are good at main chain, so can especially preferably use.Ester ring type structure optimization saturated cyclic hydrocarbon structure, its carbon number is preferred 4～30, is more preferably 5～20, preferred especially 5～15.Ratio with the repetitive with ester ring type structure in the fluoropolymer resin of ester ring type structure is preferably 50 weight % or more than the 50 weight %, is more preferably 70 weight % or more than the 70 weight %, preferred especially 90 weight % or more than the 90 weight %.
As resin with ester ring type structure, can enumerate, for example, the hydrogenation thing of the unsaturated bond part that contains aromatic rings of the cyclic olefin polymer of monomers of the addition polymer of the ring-opening polymerization polymer of norborneol vinyl monomer or ring opening copolymer thing or its hydrogenation thing, norborneol vinyl monomer or addition copolymer or its hydrogenation thing, monocycle or its hydrogenation thing, cyclic conjugated diene class polymer of monomers or its hydrogenation thing, alicyclic vinyl ring type hydro carbons polymer of monomers or copolymer or its hydrogenation thing, vinyl aromatic hydro carbons polymer of monomers or copolymer etc.In the middle of these, the hydrogenation thing of the unsaturated bond part that contains aromatic rings of the hydrogenation thing of ENB class polymer of monomers and vinyl aromatic hydro carbons polymer of monomers is owing to mechanical strength and excellent heat resistance, so especially preferably use.
As methacrylic resin, can enumerate with respect to whole repetitives and preferably contain 80 moles of % or 80 moles the methacrylic resin more than the % from the repetitive of methyl methacrylate.Wherein, preferably according to ASTM D1238 benchmark, the melt flow rate (MFR) of measuring under 230 ℃, the heavy burden of 37.3kg is the methacrylic resin that 0.5～20g/10 divides.
(methyl) alkyl acrylate-aromatic vinyl copolymer can carry out copolymerization with aromatic ethenyl compound and (methyl) acrylic acid alkyl ester compound with low alkyl group and obtain.
As aromatic ethenyl compound, can enumerate styrene, AMS, a methyl styrene, p-methylstyrene, chloro styrene, to chlorostyrene etc.They can use separately or use simultaneously more than 2 kinds or 2 kinds.
As (methyl) acrylic acid alkyl ester compound with low alkyl group, can enumerate and have carbon number and be 1～4 alkyl, preferably have (methyl) alkyl acrylate that carbon number is 1 or 2 alkyl, particularly, can enumerate methyl methacrylate, EMA, methyl acrylate, ethyl acrylate.They can use separately or use simultaneously more than 2 kinds or 2 kinds.
Each components in proportions that constitutes above-mentioned copolymer is, aromatic ethenyl compound is the scope of 95～5 weight %, and (methyl) acrylic acid alkyl ester compound with low alkyl group is the scope of 5～95 weight %.Wherein, from aspects such as optical characteristics, mouldabilities, preferred above-mentioned aromatic ethenyl compound is the scope of 60～20 weight %, and (methyl) acrylic acid alkyl ester compound with low alkyl group is the scope of 80～40 weight %.
The glass transition temperature Tg of the thermoplastic resin that uses among the present invention is more than 80 ℃ or 80 ℃, preferred 90～250 ℃.Glass transition temperature Tg is according to JISK 7121 benchmark, and (DSC) measures by the differential scanning calorimetry.
In addition, when using thick flat-plate molded product of the present invention, optionally, can in above-mentioned resin, mix other polymer, various compounding ingredient or the filler more than a kind or 2 kinds or 2 kinds as LGP.As other polymer, can enumerate rubber or resins such as polybutadiene, polyacrylate.
As compounding ingredient, can enumerate compounding ingredients such as colouring agents such as antioxidant, ultra-violet absorber, light stabilizer, near infrared ray absorption, dyestuff or pigment, lubricant, plasticizer, antistatic additive, fluorescent whitening agent.In addition, LGP may not be transparent, can cooperate the particulate that comprises polystyrene base polymer, polysiloxanes base polymer or their cross-linking agent, thereby give light scattering ability.
Above-mentioned other polymer, various compounding ingredient or packing material can be alone or in combination uses more than 2 kinds or 2 kinds, its use level can suitably be selected in the scope of not damaging purpose of the present invention, for thermoplastic resin 100 weight portions, be generally 0～5 weight portion, preferred 0～3 weight portion.
In the manufacture method of thick flat-plate molded product of the present invention, when the thick flat-plate molded product by injection mo(u)lding manufactured thermoplastic resin, heating mould is so that the temperature maintenance on 2 end limits of at least 1 pair relative direction of the rectangle inner chamber of die injection moulding is higher more than 2 ℃ or 2 ℃ than the maximum temperature of the central portion of the inner chamber of mould.The temperature of the central portion of said inner chamber is meant the temperature of central portion of mould of the central portion contact of thick flat-plate molded product.In addition, the temperature on 2 end limits of said relative direction is meant the temperature on 2 end limits of the mould that contacts with thick flat-plate molded product.In addition, when having Temperature Distribution on 2 end limits, the temperature maintenance that is necessary to make its lowermost portion is high more than 2 ℃ or 2 ℃ for the maximum temperature than the central portion of inner chamber.Fig. 4 is a kind of key diagram of mode of heating means that the end limit of the inner chamber in the inventive method is shown.In this figure, imbed the heater air flow pressure switch rod 6 that constitutes by heating resistor on 2 long limits of 1 pair of relative direction of the inner chamber 5 of mould.By regulating voltage, can control the temperature on the end limit of inner chamber to the heater air flow pressure switch rod energising.In mode shown in Figure 4, heater air flow pressure switch rod in addition, is also imbedded on 2 other limits in 2 long limits of 1 pair of relative direction of heating mould inner chamber, 4 end limits of 2 pairs of relative directions that can heating bore.In the methods of the invention, the method on the end limit of heating bore is not particularly limited, for example, the stream of thermal medium is set near the end limit of inner chamber that can be in mould, and heats by the thermal medium of circulation high temperature.
In the methods of the invention, the temperature on 2 end limits of at least 1 pair of relative direction by making dies cavity can be prevented the few thick flat-plate molded product with excellent flatness of marginal portion thickening, thickness deviation of thick flat-plate molded product than the temperature height of the central portion of inner chamber.In addition, when thick flat-plate molded product is LGP, be provided for the fine prism patterns (プ リ ズ system パ one Application) of diffused light mostly at exiting surface, be provided for controlling the fine patterns such as projection of reflection direction at reflecting surface.The molten resin of delivering in the inner chamber from cast gate flows in inner chamber and arrival end limit, thereby inner cavity filled., between flow periods, the temperature of molten resin descends in inner chamber, and on the end limit of inner chamber, the transfer printing of the fine relief pattern of mould becomes incomplete easily.According to method of the present invention, the temperature on the end limit of the inner chamber that the temperature by making molten resin descends easily is than the maximum temperature height of inner chamber central portion, the transfer printing that can improve the fine relief pattern of mould.
In the methods of the invention, the temperature control method of mould is not particularly limited, for example, the thermal medium of circulation uniform temperature in the stream of the thermal medium in mould, can control mold temperature for certain, perhaps, in 1 cycle of injection mo(u)lding, alternately feed the thermal medium of high temperature and the thermal medium of low temperature, improve mold temperature when injection moulding, the flowability and the transfer printing that improve molten resin reduce mold temperature when cooling, thereby can shorten molding cycle, improve productivity.The control mold temperature is one regularly, and its temperature reaches the maximum temperature of inner chamber central portion, and when alternately feeding the thermal medium of the thermal medium of high temperature and low temperature, in 1 molding cycle, the maximum temperature that the central portion of inner chamber arrives is the maximum temperature of inner chamber central portion.
In the methods of the invention, the temperature maintenance on 2 end limits of at least 1 pair of relative direction of the inner chamber of mould is higher more than 2 ℃ or 2 ℃ than the maximum temperature of the central portion of inner chamber, be more preferably high 3 ℃～30 ℃, be more preferably high 5～20 ℃.During 2 ℃ of the difference deficiencies of the maximum temperature of the lip temperature of the inner chamber of mould and the central portion of inner chamber, can not fully show the effect of the fine relief pattern of the effect of the thickness deviation that reduces thick flat-plate molded product and correct roller mould.When the difference of the maximum temperature of the lip temperature of the inner chamber of mould and the central portion of inner chamber is excessive, the molding cycle of prolongation is arranged, reduce productive danger.
In the present invention, usually with Tg+100 (℃)～Tg+200 (℃), preferred Tg+150 (℃)～Tg+200 (℃) resin temperature, usually with Tg-50 (℃), preferred Tg-30 (℃)～Tg (℃) mold temperature under carry out injection mo(u)lding.In addition, the glass transition temperature of the thermoplastic resin that is to use of above-mentioned Tg (unit for ℃).
Embodiment
Below, enumerate embodiment the present invention is described in further detail, but the present invention is not subjected to any restriction of these embodiment.
In addition, in embodiment and comparative example, thick flat-plate molded product is estimated by following method.
(1) gap width
With the intersection of diagonal of LGP as central portion, on by central portion and the straight line parallel, use non-contact three-dimensional analyzer [three hawk light devices (strain), NH-3] with minor face, from the end to end of LGP measuring space thickness, and obtain gap width by following formula with 0.1mm.
Gap width={ (T
MAX-T
MIN)/T
CENTER} * 100 in above-mentioned formula, T
MAXMaximum ga(u)ge, the T of expression LGP
MINMinimum thickness, the T of expression LGP
CENTERThe thickness of the central portion of expression LGP.
(2) transferring rate
With the intersection of diagonal of the LGP of minor face 276.4mm, long limit 344.0mm as central portion, by central portion and be parallel on the straight line of minor face, use super degree of depth microscope [(strain) キ one エ Application ス, VK-95001, measure the height h (μ m) of columned projection at central portion, apart from central portion 69.1mm, 103.6mm, from 132mm to 138mm 13 of spacing 0.5mm and 138.2mm, obtain the transferring rate of each point by following formula, mean value and standard deviation by the numerical computations of trying to achieve again.
Transferring rate=(h/h
t) * 100 (%)
Wherein, h
tBe the theoretical level (μ m) of the columned projection that calculates by mould, with the deep equality of the columned pit of dies cavity.
(3) exterior quality
1 cold-cathode fluorescence lamp [the Ha リ ソ Application ラ イ テ ィ Application グ of Toshiba (strain), MBSM24JN10WX370NLU] respectively is installed on 2 long limits of LGP, and the assembling liquid crystal indicator by visual, is noted open-wire line and blanking bar that lamp is neighbouring, checks presentation quality.
Embodiment 1
Use as a kind of norbornene polymer [Japanese ゼ オ Application (strain) with resin of ester ring type structure, ZEONOR1060R, 100 ℃ of glass transition temperatures] as thermoplastic resin, with injection moulding machine [toshiba machine (strain), IS350GS, screw diameter 70mm, clamping pressure 3430kN], by 17 inches type LGPs of injection mo(u)lding manufactured.
The moulding product are of a size of minor face 276.4mm, long limit 344.0mm, thickness 8.0mm.Or be the surface of internal cavity of movable side of mould of the exiting surface of LGP, with the state that connects with the lower end between adjacent unit prismatic, perpendicular to long limit section being set is that the unit prismatic of isosceles triangle of base 50 μ m, drift angle 140 degree is as the prism patterns of diffused light.At the surface of internal cavity of the fixation side of the mould of the reflecting surface that becomes LGP, the cave of the columned projection that forms diameter 80 μ m, high 80 μ m is set from the spacing 130 μ m of the centre on 2 long limits of inner chamber with expanding near the long limit spacing 300 μ m successively to.Adjacent with 2 long limits of dies cavity, respectively imbed the heater air flow pressure switch rod of 1 800W.In addition, 1 minor face at inner chamber is provided with ventilating opening (Off ア Application ゲ one ト).
Use above-mentioned injection moulding machine and mould, forming temperature be 270 ℃, mold temperature be near 85 ℃, the long limit of mould temperature be 95 ℃, 5 seconds injection times, injection moulding after-applied 10 second 15MPa pressurize, then cool off 120 seconds, take out under 5 seconds, molding cycle 140 seconds, carry out the injection mo(u)lding of LGP.Mold temperature by will be in mould the temperature of warm water of stream circulation remain 80 ℃ and regulate, near the voltage that temperature is switched on to heater air flow pressure switch rod by control the long limit of mould remains 95 ℃.The maximum temperature of the central portion of dies cavity is 85 ℃, and the long limit temperature of inner chamber is 95 ℃.
The maximum ga(u)ge of the LGP that obtains is 8.011mm, and minimum thickness is 7.995mm, and the thickness of central portion is 8.001mm, and gap width is 0.20%.The mean value of transferring rate is 89.5%, and standard deviation is 0.34%.When using this LGP to estimate exterior quality, on the picture of liquid crystal indicator, do not have open-wire line, blanking bar, exterior quality is good.
Embodiment 2
Except take out 5 seconds, injection moulding 5 seconds, during 10 seconds of pressurize in mould the warm water of 90 ℃ of stream circulations, cooling during 100 seconds in mould the cold water of 25 ℃ of stream circulations, under the condition identical, carry out the injection mo(u)lding of LGP with embodiment 1.The maximum temperature of the central portion of dies cavity is 90 ℃, and the long limit temperature of inner chamber is 95 ℃.
The maximum ga(u)ge of the LGP that obtains is 8.018mm, and minimum thickness is 7.989mm, and the thickness of central portion is 8.005mm, and gap width is 0.36%.The mean value of transferring rate is 93.7%, and standard deviation is 0.18%.When using this LGP to estimate exterior quality, on the picture of liquid crystal indicator, do not have open-wire line, blanking bar, exterior quality is good.
Embodiment 3
Except using resin that methacrylic resin [Asahi Chemical Industry's (strain), デ Le ペ Star ト 80NH] replaces having the ester ring type structure as thermoplastic resin, forming temperature changes into beyond 260 ℃, under the condition identical with embodiment 1, carries out the injection mo(u)lding of LGP.
The maximum ga(u)ge of the LGP that obtains is 8.025mm, and minimum thickness is 7.994mm, and the thickness of central portion is 8.015mm, and gap width is 0.39%.The mean value of transferring rate is 80.3%, and standard deviation is 1.50%.When using this LGP to estimate exterior quality, on the picture of liquid crystal indicator, do not have open-wire line, blanking bar, exterior quality is good.
Embodiment 4
Except using methacrylate-aromatic vinyl copolymer [Nippon Steel's chemistry (strain), エ ス チ レ Application MS-600] replace having the resin of ester ring type structure as beyond the thermoplastic resin, under the condition identical, carry out the injection mo(u)lding of LGP with embodiment 1.
The maximum ga(u)ge of the LGP that obtains is 8.052mm, and minimum thickness is 7.978mm, and the thickness of central portion is 8.040mm, and gap width is 0.92%.The mean value of transferring rate is 82.4%, and standard deviation is 1.82%.When using this LGP to estimate exterior quality, on the picture of liquid crystal indicator, do not have open-wire line, blanking bar, exterior quality is good.
Comparative example 1
Except taking-up is adjacent to 2 heater air flow pressure switch rods that long limit is imbedded of dies cavity, do not carry out beyond the heating of long side, under the condition identical, carry out the injection mo(u)lding of LGP with embodiment 1.The maximum temperature of the central portion of dies cavity is 85 ℃, and the long limit temperature of inner chamber is 85 ℃.
The maximum ga(u)ge of the LGP that obtains is 8.102mm, and minimum thickness is 7.808mm, and the thickness of central portion is 8.005mm, and gap width is 3.67%.The mean value of transferring rate is 84.9%, and standard deviation is 11.98%.When using this LGP to estimate exterior quality, near the long limit of the picture of liquid crystal indicator, open-wire line and blanking bar occur, exterior quality is bad.
Embodiment 1～4 and comparative example 1 the results are shown in table 1.
Table 1
| Thermoplastic resin | Mold temperature (℃) | Gap width (%) | Transferring rate (%) | Exterior quality | |||
| Middle body is the highest | Long limit | Mean value | Standard deviation | ||||
| Embodiment 1 | The ester ring type structure | 85 | 95 | 0.20 | 89.5 | 0.34 | Well |
| Embodiment 2 | The ester ring type structure | 90 | 95 | 0.36 | 93.7 | 0.18 | Well |
| Embodiment 3 | Methacrylic acid | 85 | 95 | 0.39 | 80.3 | 1.50 | Well |
| Embodiment 4 | The copolymer of methacrylate-aromatic ethenyl compound | 85 | 95 | 0.92 | 82.4 | 1.82 | Well |
| Comparative example 1 | The ester ring type structure | 85 | 85 | 3.67 | 84.9 | 11.98 | Open-wire line, blanking bar |
As shown in table 1, heater air flow pressure switch rod is imbedded on 2 long limits that are adjacent to dies cavity, the LGP of the embodiment 1～4 that near the long limit of maintenance dies cavity temperature is higher than the maximum temperature of dies cavity central portion, the deviation of the transferring rate of thickness deviation and columned projection is little, on the picture of liquid crystal indicator, do not have open-wire line or blanking bar, have good performance.Particularly, used the excellent performance of LGP of the embodiment 1～2 of resin with ester ring type structure.In contrast, do not have the LGP of comparative example 1 on the end limit of heating mould inner chamber, the deviation of the transferring rate of thickness deviation and columned projection is little, occurs open-wire line or blanking bar on the picture of liquid crystal indicator.
Industrial applicibility
The thickness deviation of thick flat-plate molded product of the present invention is little, and flatness is good, uses by the LGP as liquid crystal indicator, can obtain not having at picture the exterior quality of the excellence of open-wire line or blanking bar etc. According to the inventive method, by the end limit of heating die injection moulding inner chamber, make the temperature on end limit higher than the temperature of the central portion of inner chamber, can easily make the thick flat-plate molded product that thickness deviation is little, flatness is good.
Claims (7)
1. thick flat-plate molded product, it is the rectangular thick flat-plate molded product that thermoplastic resin forms that contains by the injection mo(u)lding manufactured, it is characterized in that, with following formula:
Gap width={ (T
MAX-T
MIN)/T
CENTER} * 100
(in above-mentioned formula, T
MAXMaximum ga(u)ge, the T of expression flat-plate molded product
MINMinimum thickness, the T of expression flat-plate molded product
CENTERThe thickness of the central portion of expression flat-plate molded product) gap width of expression is below 3% or 3%.
2. according to the thick flat-plate molded product of claim 1 record, wherein, gap width is below 1% or 1%.
3. according to the thick flat-plate molded product of claim 1 or 2 records, wherein, the thickness of central portion is 3～50mm.
4. according to the thick flat-plate molded product of each record in the claim 1～3, wherein, thermoplastic resin is the resin with ester ring type structure.
5. according to the thick flat-plate molded product of each record in the claim 1～3, wherein, thermoplastic resin is methacrylic resin or (methyl) alkyl acrylate-aromatic vinyl copolymer.
6. according to the thick flat-plate molded product of each record in the claim 1～5, this thick flat-plate molded product is the LGP of liquid crystal indicator.
7. according to the manufacture method of the thick flat-plate molded product of each record in the claim 1～6, it is characterized in that, when the thick flat-plate molded product by injection mo(u)lding manufactured thermoplastic resin, heating mould is so that the temperature maintenance on 2 end limits of at least 1 pair relative direction of the rectangle inner chamber of die injection moulding is higher more than 2 ℃ or 2 ℃ than the maximum temperature of the central portion of the inner chamber of mould.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003340603 | 2003-09-30 | ||
| JP340603/2003 | 2003-09-30 |
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|---|---|
| CN1860013A true CN1860013A (en) | 2006-11-08 |
| CN100482442C CN100482442C (en) | 2009-04-29 |
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| CNB2004800283293A Expired - Fee Related CN100482442C (en) | 2003-09-30 | 2004-09-29 | Thick flat-plate molded product and method of producing the same |
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| Country | Link |
|---|---|
| JP (1) | JPWO2005030468A1 (en) |
| KR (1) | KR20060088550A (en) |
| CN (1) | CN100482442C (en) |
| TW (1) | TW200526392A (en) |
| WO (1) | WO2005030468A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110103411A (en) * | 2019-04-24 | 2019-08-09 | 中国航发北京航空材料研究院 | A kind of multiple injection molding die and the injection moulding method using the mold |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6591891B2 (en) * | 2015-12-28 | 2019-10-16 | 株式会社クラレ | Manufacturing method of injection molded products |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0712635B2 (en) * | 1987-09-28 | 1995-02-15 | ポリプラスチックス株式会社 | Injection molding method for cylindrical molded products |
| JPH0673887B2 (en) * | 1988-12-14 | 1994-09-21 | 出光石油化学株式会社 | Injection molding mold and method of molding disk substrate using the mold |
| JP3601463B2 (en) * | 2000-05-26 | 2004-12-15 | 住友化学工業株式会社 | Method for manufacturing large light guide plate having pattern |
| JP4202653B2 (en) * | 2002-01-16 | 2008-12-24 | 三菱電線工業株式会社 | Resin long body molding die and molding method thereof |
-
2004
- 2004-09-29 CN CNB2004800283293A patent/CN100482442C/en not_active Expired - Fee Related
- 2004-09-29 TW TW093129400A patent/TW200526392A/en unknown
- 2004-09-29 JP JP2005514324A patent/JPWO2005030468A1/en not_active Withdrawn
- 2004-09-29 KR KR1020067006171A patent/KR20060088550A/en not_active Application Discontinuation
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110103411A (en) * | 2019-04-24 | 2019-08-09 | 中国航发北京航空材料研究院 | A kind of multiple injection molding die and the injection moulding method using the mold |
Also Published As
| Publication number | Publication date |
|---|---|
| KR20060088550A (en) | 2006-08-04 |
| WO2005030468A1 (en) | 2005-04-07 |
| TW200526392A (en) | 2005-08-16 |
| JPWO2005030468A1 (en) | 2006-12-07 |
| CN100482442C (en) | 2009-04-29 |
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