CN100431817C

CN100431817C - Belt type continuous plate manufacturing device and method of manufacturing sheet polymer

Info

Publication number: CN100431817C
Application number: CNB200380107621XA
Authority: CN
Inventors: 奥津肇; 沟田浩敏
Original assignee: Mitsubishi Rayon Co Ltd
Current assignee: Mitsubishi Chemical Corp
Priority date: 2003-01-07
Filing date: 2003-12-22
Publication date: 2008-11-12
Anticipated expiration: 2023-12-22
Also published as: JP2004209868A; CN1732072A

Abstract

A belt type continuous plate manufacturing apparatus comprising two facing endless belts 1, 1' and gaskets 7 sandwiched by belt surfaces at their both side edge portions, wherein a polymerizable raw material is fed into a space surrounded by the facing belt surfaces and the gaskets 7 from its one end, the polymerizable raw material is solidified together with running of the belts in a heating zone, and the plate polymer is taken out from the other end, characterized in that three or more upper and lower roll pairs satisfying the following formulae (1) and (2) are placed so that respective axes thereof orthogonally cross the belt running direction, between a raw material feeding position and a heating initiation position; and a method of producing a plate polymer by using it: D/Z>=0.04 (1), 0.30<=D/X<=0.99 (2) [D=outermost diameter of roll body portion (mm), Z=width of roll body portion (mm), X=distance between axis centers of adjacent upper and lower roll pairs (mm)].

Description

The manufacture method of belt type continuous plate device and sheet polymer

Technical field

The present invention relates to continuously the polymerism raw material be carried out the method that polymerization is made the belt type continuous plate device of plate-shaped products (sheet polymer) and made sheet polymer with this device.

Background technology

Be the sheet polymer that obtains of main material with the methyl methacrylate because its superior characteristic, be widely used for cleaning purposes, lighting use and other field of billboard, building materials purposes, bus etc.In addition, in recent years, also as the LGP of the such display unit of LCD, along with the ITization in the world, its demand increases sharp.

Concerning this LGP, certainly require good optical characteristics as material, in addition, distribute, more also require the dimensional accuracy (being designated hereinafter simply as " thickness of slab precision ") of very high thickness direction with original purposes for making display not produce uneven briliancy.

On the other hand, as the method for continuous manufacturing sheet polymer, the continuous casting process that has used the belt type continuous plate device is arranged.This belt type continuous plate device be in the horizontal direction with same speed advance between the relative conveyer belt of up and down 2 endless belt conveyers, supply with the polymerism raw material from a side, when endless belt conveyer moves, make it polymerization, obtain the device of sheet polymer from the opposing party with methods such as heating.

Problem as the thickness of slab precision of such continuous plate device is, exists to come from the plate-shaped products thickness deviation in the longitudinal direction that the supply of raw material inequality that offers device is caused.Particularly in recent years, to the high request of thickness of slab precision, even to being connected in the degree that flow deviation that the such method of flowmeter also detects the small degree of not coming out also becomes problem being set on the feed line.

Therefore, in order to suppress the thickness deviation of length direction, not on the feed line but on the continuous plate device, be necessary to be provided with some mechanism.Can enumerate as such mechanism, for example, as shown in the special fair 4-1685 communique of Japan, from the raw material supplying position to right with the roll shaft up and down that the perpendicular mode of the direct of travel of conveyer belt disposes the heating starting position with axle separately.But, to this up and down roll shaft on the overall diagram of belt type continuous plate device, only having done schematic record, and to not doing any clear and definite record with the relation of the thickness of slab precision of length direction.

In addition, on the belt type continuous plate device, except aforesaid up and down roll shaft to, endless belt conveyer and sealing gasket etc. also apply great influence to the thickness of slab precision of plate-shaped products.For example, for endless belt conveyer, importantly how the transmission zone face that contacts with raw material is held in the plane.Particularly in heating region,, produce distortion along with thermal expansion, thereby will note keeping the non-temperature constant state that transmits zone face because material liquid or endless belt conveyer occurrence temperature change.

As the technology that in heating region, keeps the transmission zone face of non-temperature constant state, for example just like shown in the Japanese Patent Publication 58-49167 communique, the polymerism raw material carries out polymerization so that reach in the interval of the state that can not flow in heating region, makes the both side ends of the width of conveyer belt keep the method higher than the temperature of central part etc.But, when present inventors carry out supplementary test according to this communique, taken place because some situation produces the problem of optical distortion along the direct of travel of conveyer belt on the width of the plate-shaped products that makes.This optical distortion is remarkable especially on the temperature boundary position that adds hot media of the central part of the both side ends of the high temperature of width and low temperature.Over can not satisfying into year, this optical distortion, wishes to improve at once to the requirement of the extreme strictness of goods.

Also have, yes is used for preventing the leakage of polymerism raw material for sealing gasket, is the vitals for the thickness of slab precision that improves resulting plate-shaped products.Can enumerate as the sealing gasket that is fit to the belt type continuous plate device, for example shown in the Japanese Patent Publication 47-49823 communique, be the sealing gasket of 0.01～0.5kg/cm in the compressive strength of polymerization temperature lower compression during to the target thickness of slab.

But, when being the plate-shaped products of 3mm, the manufacturing thickness of being put down in writing in the embodiment of this communique sets ± the thickness of slab precision level of 0.3mm, and for the purposes of desired goods in recent years, the situation that precision is not enough is in the majority.And, distinguish according to present inventors' investigation, even sealing gasket has satisfied the compressive strength that this communique is put down in writing, the outside that raw material leaks into sealing gasket has according to circumstances still taken place.As the reason deducibility that this leakage takes place for being because: the distance between the last lower conveyor belt face in the heating region as shown in Figure 6, since for keep to transmit roll shaft up and down that zone face disposed right under T1 and roll shaft between T2 unequal, so apply periodic shear stress with the driving fit portion that transmits zone face at sealing gasket.

Yet, even take to use the sealing gasket of high compression-strength to improve the means of the adaptation between sealing gasket and transmission zone face in order to prevent such leakage, because transmit the hydraulic pressure of zone face compares with liquid pushing in the raw material, the reaction force that has only the sealing gasket pushing to transmit zone face becomes high, and the result is that the both ends of the width of resulting plate-shaped products often become extremely thick.

Summary of the invention

The present invention puts forward for solving described prior art problems.That is, the purpose of this invention is to provide and a kind ofly can make the belt type continuous plate device of sheet polymer and the manufacture method of sheet polymer with high thickness of slab precision.

Present inventors have at first carried out detailed discovering to the thickness deviation of length direction, and the narrow device of the belt type continuous plate device of amplitude broad and amplitude is compared, and significant thickness deviation has taken place.And, study with keen determination having carried out for the roll shaft up and down that disposes in the perpendicular mode of separately the axle and the direct of travel of conveyer belt in heating starting position interval from the raw material supplying position, found that, when the width of the external diameter of roll shaft stem portion, roll shaft stem portion, adjacent roll shaft satisfy specific the relation to each other axle distance between centers, the thickness deviation of length direction will lower widely.

And, present inventors to how the endless belt conveyer face being remained the plane inquire into, find out that its reason is the optical distortion that direct of travel took place along conveyer belt in the centre position of spraying the mutually different spray nozzle that adds hot media, thermal expansion speed in the both side ends of the width of endless belt conveyer is more faster than central part, the thermal deformation dislocation has taken place, thereby has formed the concavo-convex of part.And, the thermal expansion speed of endless belt conveyer has been carried out discussion with keen determination, found that, if the speed that the temperature of endless belt conveyer is risen (below, abbreviate " programming rate " as) fix in a certain specific scope, the thermal deformation of endless belt conveyer comes down to carry out equably, then can obtain not having on width the sheet polymer of the high thickness of slab precision of having of optical distortion.

Present inventors find further that also when using some specific sealing gasket, the thickness of slab precision of sheet polymer significantly improves.

Promptly, belt type continuous plate device of the present invention is, by be configured to relative transmission zone face with same speed in the space that the relative transmission zone face of equidirectional two endless belt conveyers of advancing and the continuous seal pad of advancing with the state of the transmission zone face clamping of the dual-side portion that is positioned at them are surrounded, supply with the polymerism raw material from the one end, the polymerism raw material is solidified, take out sheet polymer from its other end; It is characterized in that:, and make its axle separately perpendicular with the direct of travel of conveyer belt right to configuration the heating starting position more than or equal to 3 pairs of roll shafts up and down that satisfy following formula (1) and (2) from the raw material supplying position;

Formula (1): D/Z 〉=0.04

Formula (2): 0.30≤D/X≤0.99

Wherein: the external diameter (mm) of D=roll shaft stem portion

The width (mm) of Z=roll shaft stem portion

The adjacent roll shaft up and down of X=is to each other axle distance between centers (mm).

And, in the present invention,, regulates two endless belt conveyer both sides and makes the maximum of its per 1 minute temperature rising smaller or equal to 60 ℃ when two endless belt conveyers of advancing arrive the inlet of heating regions and temperature when rising beginning.

Also have, in the present invention, employed sealing gasket is smaller or equal to 0.5N/mm in the compressive strength of heating-up temperature lower compression during to the thickness of sheet polymer, and, be more than or equal to 8mm at the transmission zone face and the contact width between the sealing gasket outer surface of heating-up temperature lower compression during to the thickness of sheet polymer.

Description of drawings

Fig. 1 is the schematic sectional view of an example of expression belt type continuous plate device of the present invention;

Fig. 2 be the roll shaft up and down of Fig. 1 to 11,11 ' diagrammatic top view;

Fig. 3 be the roll shaft up and down of Fig. 1 to 11,11 ' diagrammatic side view;

Fig. 4 is that expression is provided for detecting the view of generating laser 15 of position (sealing gasket in-position) of sealing gasket that raw material that the belt type continuous plate device extends because of deadweight arrives the dual-side portion of downside conveyer belt;

Fig. 5 is an enlarged drawing of representing the contact site between endless belt conveyer face and sealing gasket outer surface with the cross section vertical with direction of belt travel;

Fig. 6 be up and down endless belt conveyer the conveyer belt interplanar distance from and up and down roll shaft between the diagrammatic side view of relation;

Fig. 7 is the evaluation ideograph of the optical distortion of embodiment and comparative example;

Fig. 8 is the stereogram of the board size of expression when embodiment and comparative example are evaluated;

Fig. 9 is the stereogram of the board size of expression when embodiment and comparative example are evaluated.

The specific embodiment

Fig. 1 is the schematic sectional view of an example of expression belt type continuous plate device of the present invention.

On the device shown in this figure, two endless belt conveyers (stainless steel conveyor belt etc.) 1,1 ' respectively by

main belt wheel

2,3,2 ', 3 ' grant tension force, and downside conveyer belt 1 ' by the 3 ' starting of main belt wheel.The liquid polymerization raw material that contains polymerizable compound is carried liquid by constant displacement pump 5, supplies to downside from nozzle 6 and transmits on the zone face.In this example, the position of the leading section of this nozzle 6 is raw material supplying positions.

Endless belt conveyer 1,1 ' width should be 500mm～5000mm, thickness should be 0.1mm～3mm.Be applied to endless belt conveyer 1,1 ' on tension force on the perpendicular sectional area of each and direct of travel, should be 1.0 * 10 ⁷Pa～1.5 * 10 ⁸In the Pa scope.If tension force is too little, big deflection can take place and be undesirable in conveyer belt.If tension force is too big, rigidity that must intensifier neither be desirable so that exceed necessary degree.

Make endless belt conveyer 1 under the effect of frictional force by sealing gasket described later and sheet polymer, with endless belt conveyer 1 ' advance to same direction with identical speed.Its gait of march should be 0.1m/min～10m/min, can do suitable change according to the situations such as timetable of thickness of slab of producing or replacing kind.

In the dual-side portion that transmits between the zone face, should use in the compressive strength of heating-up temperature lower compression during to the thickness of sheet polymer is that the sealing gasket 7 that is less than or equal to 0.5N/mm seals.Sealing gasket 7 by be positioned at the continuous plate device more the spool 13 of upstream position provide, sealing gasket end 14 should be exposed to the outside of spool 13.

As the material of sealing gasket, owing to can at random adjust spring rate, so the soft PVC that should adopt always to be adopted by the mixed proportion that changes plasticizer.As the plasticizer that is blended in the polyvinyl chloride, can use dibutyl phthalate (DBP) or phthalic acid two (2-ethylhexyl) ester or other generally to use plasticizer in polyvinyl chloride.For example, dibutyl phthalate (DBP) or phthalic acid two (2-ethylhexyl) when ester uses as plasticizer, in order to make the sealing gasket with the desirable compressive strength of the present invention, it is 20～60 mass parts that the mixed proportion of plasticizer should be relative 100 mass parts polyvinyl chloride.In addition, suitably heat of mixing stabilizing agent, antioxidant etc.

As being fit to do the material of sealing gasket, can also enumerate the foamed material etc. that polyethylene for example and other have flexible plastics outside the soft PVC.Expansion ratio when these materials are shaped by adjusting just can at random be adjusted spring rate.And the always general rubber-like of using such as natural rubber or other rubber is adjusted spring rate owing to can add the sulphur degree by change, so also can be used as sealing gasket.

As the profile of sealing gasket, can be different shapes such as circle, ellipse, rectangle, square.Under the situation of rectangle or square etc., except that the deflection of partes glabra, because the distortion in bight can influence compressive strength, so preferably adopt circular or oval-shaped sealing gasket in order to obtain uniform compressive strength.As the structure of sealing gasket, the inside that preferably has section becomes the hollow structure of blank part.

About the size of sealing gasket, the girth of the peripheral part of section should be more than or equal to 20mm, and is better more than or equal to 30mm.Should be at transmission zone face and the contact width between sealing gasket outer surface of heating-up temperature lower compression during more than or equal to 8mm to the thickness of sheet polymer.In order to make contact width more than or equal to 8mm, the girth of the peripheral part of section must be bigger than the K value shown in the following formula (4), preferably sets girth than the big 2mm of K value or more than the 2mm.

K[mm]=2 * (target thickness of slab [mm])+16...... (4)

If the girth of the peripheral part of sealing gasket section surpasses 400mm, the use amount of the sealing gasket of every goods must increase, and is disadvantageous from the angle of manufacturing cost.

The wall thickness of the sealing gasket of hollow structure should be in 0.1mm～4mm scope.Under the situation that in hollow bulb, is blown into air or inert gas, air flue in order to ensure hollow bulb, wall thickness should be set at sheet polymer thickness 45% or below it, and the sectional area of the hollow bulb when being compressed to sheet polymer thickness should be set at least more than or equal to 1mm ²

The cross dimensions of sealing gasket should be, at the thickness of heating-up temperature lower compression to sheet polymer, be 0.5N/mm promptly in the compressive strength of heating-up temperature lower compression during to the target thickness of goods, and, during to the thickness of sheet polymer, the outer surface of sealing gasket as shown in Figure 5 and the contact width B value that transmits between zone face should be more than or equal to 8mm in the heating-up temperature lower compression.If compressive strength is low excessively, just can not keep the shape of section, owing to be difficult to provide stable sealing gasket to device for board manufacture, this is not desirable.If contact width B is narrow, the frequency that material liquid leaks into the sealing gasket outside will increase, and, owing to act on the reaction force that transmits on the zone face in narrower scope at sealing gasket on the width, undesirable so thickness of slab thickens.Yet if contact width surpasses 150mm, with respect to the width of limited endless belt conveyer, the shared ratio of goods significantly descends, and is disadvantageous from the angle of productivity ratio.

Reach under the situation of desired pressure at the hollow bulb that air or inert gas is blown into the sealing gasket of hollow structure, because the apparent compressive strength that can freely regulate sealing gasket, so also can use wall thickness low elasticity sealing gasket as thin as a wafer.

Though the end that air or inert gas both can sealing gaskets before will offering device for board manufacture, that be wound onto the state on the spool is connected with gas pipeline and is blown into; On the contrary, also can be connected with gas pipeline and be blown into, but be preferably the former at the sealing gasket that will be connected with the plate end after the continuous plate device is peeled off.

The pressure of the hollow bulb of the sealing gasket of hollow structure, should be adjusted at gauge pressure is 0～3.0 * 10 ⁴In the Pa scope.If the hollow bulb hypertonia is compared with the internal hydraulic pressure of raw material because the reaction force of sealing gasket is very big, can cause that the thickness of slab precision reduces and unfavorable.And,, undesirable owing to can not guarantee to transmit contact width between zone face and sealing gasket fully if the expansion of sealing gasket becomes acutely.

When the sealing gasket of hollow structure connected to each other, the external diameter of sealing gasket and the external diameter of connecting portion should not have big difference, and in use connecting portion should not peeled off.And when the hollow bulb of sealing gasket was blown into air etc., air etc. should not leak from connecting portion.

The method that can be listed below as the method for attachment of such sealing gasket.

To separately diameter difference is 0～2mm, preferred 0～1mm, more preferably in the hollow bulb of two of 0～0.5mm hollow sealing pad α, β, the hollow sealing pad γ that inserts the suitable length littler than its diameter to be to couple together each sealing gasket α, β, again the method that the driving fit of the outside and the sealing gasket of inboard (minor diameter) partly is bonded together with bonding agent; Among two hollow sealing pads that needs connect, the end face of a sealing gasket is contacted with thermals source such as steam or heaters while heating to stretch make its elongation, diameter is also along with after attenuating, be inserted into the end of another hollow sealing pad again, again the method that the driving fit of the outside and inboard sealing gasket partly is bonded together with bonding agent; With diameter difference separately is 0～2mm, preferred 0～1mm, and more preferably the end face of two of 0～0.5mm hollow sealing pads makes its melting adhered method together etc. with heating and meltings such as heating plates behind the circumferential part aligning with hollow.

After sealing gasket connects to each other, should use the overlap of excision connecting portions such as scissors or cutoff tool so that the sealing gasket surface flattens cunning.Moreover, also plastic tape should be twisted in connecting portion.And, before connecting the hollow sealing pad, should put plastic tube in advance with the suitable length of meeting the thermal contraction function, perhaps after the hollow sealing pad connects, on connecting portion,, plastic tube is shunk by the heating of thermals source such as steam or heater, it is close on the hollow sealing pad that includes connecting portion, thereby can prevents that gas from leaking faults such as gas from the fault location of connecting portion.

In addition, the seam crossing of the two ends of contracted plastic tube and hollow sealing pad also should be rolled up plastic tube to reinforce.

The polymerism raw material along with endless belt conveyer 1,1 ' advance, by the configuration represented with blacking up and down roll shaft to 11,11 ' the interval after, enter heating region, be cured.In the present invention, with in the heating region the position near raw material supplying side be called the heating starting position.Heating region for example have hot water spray device 8,8 ' etc. heater.Hot water spray device 8,8 ' temperature should be in 50 ℃～100 ℃ scope.

In the present invention, when this temperature rises beginning, should regulate the maximum that programming rate makes in per 1 minute both sides' temperature of endless belt conveyer up and down rise and be less than or equal to 60 ℃.If the maximum that temperature rises in per 1 minute is too high, the thermal expansion of endless belt conveyer is carried out sharp, and uneven the dislocation with thermal deformation of temperature small on the conveyer belt width direction is associated, and easily causes optical distortion.And then, in per 1 minute up and down the maximum that rises of both sides' temperature of endless belt conveyer preferably in 10 ℃～58 ℃ scopes.

As the method for regulating programming rate, though be not particularly limited, but preferably adopt following method of adjustment: for example, the inlet of endless belt conveyer arrival heating region is in the temperature rising incipient stage up and down, in at least 30 seconds after the temperature rising beginning, the space of passing through should maintain relative humidity more than or equal to 50% and temperature be 50 ℃～100 ℃, it is desirable doing in view of the above.

More specifically, following method is arranged: for example, as shown in Figure 1, with use hot water spray device 8,8 ' heating region compare more and be provided with in addition the initial stage heating region 12 of environmental gas temperature maintenance at 50 ℃～100 ℃ near the raw material supplying side, utilize the heat transfer of environmental gas to be adjusted to the method for desired programming rate etc.And, big humidity in this initial stage heating region is maintained more than or equal to 50%.Because humidity is higher, the condensation heat transfer of the water vapour in the applied environment gas can further improve the free degree of regulating programming rate easily.But, for initial stage heating region 12, there is no need to be provided with the perpendicular wall of direction of belt travel spatially to separate the heating region that is positioned at its back, as long as can with about endless belt conveyer 1,1 ' programming rate be adjusted in the desired scope, also can be the structure of opening wide.

As other the control method of programming rate, also useful hot blast is as method of heat medium etc.

In addition, for the situation that initial stage heating region 12 is not set in addition, the also method that can be listed below: for example, make hot water spray device 8,8 ' the method that reduces of the hot water temperature of inlet portion of heating region, perhaps reduce the method etc. of spray volume of the hot water of inlet portion.

After having passed through heating region, for example, make plate-shaped products (sheet polymer) 10 at last with far infra-red heater 9,9 ' heat-treat and finish polymerization.Temperature range in far infra-red heater 9,9 ' interval should be in 100 ℃～150 ℃.In addition, other mode of heating such as hot blast can be adopted in two intervals of hot water spray device, far-infrared heater.

Next, to be configured in raw material supplying position and the up and down roll shaft of heating between the starting position to 11,11 ' be described in detail.In addition, " length " expression of the distance of direction of belt travel, with the perpendicular direction of direction of belt travel, i.e. roll shaft distance in the axial direction " width " expression.

Fig. 2 be the roll shaft up and down of Fig. 1 seen from the top to 11,11 ' schematic diagram.Fig. 3 be this up and down roll shaft to 11,11 ' schematic side view.Among two figure, for the ease of see up and down roll shaft to 11,11 ' and illustrate after the part of the endless belt conveyer 1 of upside cut.

As shown in Figures 2 and 3, raw material flows to from nozzle 6 on the transmission zone face of downside, afterwards owing to deadweight is temporarily expanded on the width that transmits zone face, at A ₁Point and A ₂Point contacts with the sealing gasket 7 of dual-side portion.

On Fig. 2 and Fig. 3, though the nozzle 6 that uses a tubulose as raw material supplying portion, the present invention is not limited to this.For example, can use the nozzle to the different shapes such as screw die shape of width expansion, it also can be several that the quantity of nozzle both can be one.And nozzle 6 also has no particular limits in the position of width, but its configuration should make raw material distribute equably on width, perhaps should be left-right symmetry with the center of width.That is, raw material supplying portion should have raw material and flows to by the structure on the plane that sealing gasket surrounded of downside endless belt conveyer and dual-side portion from one or several pipe.

In the present invention, up and down roll shaft to 11,11 ' the external diameter D[mm of roll shaft stem portion], the width Z[mm of roll shaft stem portion], adjacent roll shaft is to each other axle distance between centers X[mm] satisfy following formula (1) and (2)

Formula (1): D/Z 〉=0.04

Formula (2): 0.30≤D/X≤0.99

When the value of D/Z less than 0.04 the time, the rigidity step-down of the width of roll shaft, when deviation appears in the quantity delivered of raw material, eliminate deviation even dwindle the gap of up-down rollers between centers, but it is opposite, deflection has taken place because of the reaction force of raw material in the roll shaft stem portion, and deviation still is extended to the back operation, and change has appearred in the thickness of slab of end article.The value of D/Z should be less than or equal to 0.3.Also have, the value of D/X was eliminated deviation less than 0.30 o'clock even dwindle the gap of up-down rollers between centers, but raw material leave roll shaft between, the grazing of the last lower conveyor belt face of length direction is extremely low, to the elimination deviation less than obtaining effect of sufficient.And when the value of D/X surpassed 0.99, adjacent in the longitudinal direction roll shaft up and down was to there being the danger of contact to each other.

Up and down roll shaft to 11,11 ' in, if having at least a pair ofly when satisfying following formula (3), will obtain the effect of the thickness deviation of high reduction length direction.

Formula (3): 0.50≤D/X≤0.99

And, when the roll shaft up and down that satisfies formula (3) to more than or equal to two pairs the time, can obtain higher effect.The right arrangement position of roll shaft up and down that satisfies formula (3) has no particular limits.

Roll shaft should be 60mm～500mm to the external diameter D of the stem portion of 11,11 ' employed roll shaft up and down.And, all roll shafts to 11,11 ' the roll shaft stem portion both can have identical external diameter, also can be the roll shaft of the external diameter of several differences to combining.The width Z of roll shaft stem portion should be 1000mm～5000mm.Adjacent roll shaft should be 200mm～600mm to axle distance between centers X each other.

About the material of roll shaft stem portion, the both roll shaft stem portion that can make with for example various metal species materials such as stainless steel, iron, aluminium, also the roll shaft stem portion that can make with the carbonaceous composite of for example carbon roll shaft etc.And, for alleviating because the infringement that causes of contact to the stainless steel conveyor belt surface, can be on the surface of roll shaft stem portion coated with rubber.And the external diameter after covering with rubber can be crown structure.But, cause roll shaft stem portion diameter excessive if rubber wall is too thick, obstruction is added hot media and transmits contacting between zone face, and the deadweight deflection of roll shaft stem portion is increased.Take all factors into consideration the premises, the thickness of the rubber that is covered should be 1mm～20mm.About the dimensional accuracy of roll shaft stem portion, the tolerance of external diameter should be less than or equal to 0.1mm.

In the present invention, from the raw material supplying position to the up and down roll shaft of heating the starting position to 11,11 ' logarithm be more than or equal to 3 pairs.This logarithm is preferably greater than especially or equals 6 pairs.Roll shaft is to 11,11 ' to each other arrangement pitch up and down, both can be all roll shaft up and down to 11,11 ' along the equally spaced configuration of direction of belt travel, also can be partly to change arranged spaced.Roll shaft can be connected with framework independently moving up and down separately respectively by bearing to 11,11 ' both up and down, also can take with the same framework linking number moving up and down mode right to roll shaft.

And, roll shaft up and down to 11,11 ' in more near the position of raw material supplying position, transmit zone face in order to keep downside, can also below the downside conveyer belt, dispose 1 or several roll shaft.

In this device, transmission zone face maintaining body as the endless belt conveyer of advancing face-to-face, the last roll shaft that joins by upper surface with upside conveyer belt 1 and with downside conveyer belt 1 ' the lower roller shaft that joins of lower surface constitute, it is right to have disposed the perpendicular roll shaft up and down of several axles to separately and direction of belt travel along the direct of travel of conveyer belt.No matter be aforesaid up and down roll shaft to 11,11 ', still be configured in use hot water spray device 8,8 ' the thermal treatment zone interval in several to roll shaft up and down to 4,4 ', the roll shaft up and down that all belongs to above-mentioned transmission zone face maintaining body is right.Up and down roll shaft to 4,4 ' suitable structure, with aforesaid roll shaft up and down to 11,11 ' identical.

Next, on the transmission zone face that flows to downside from nozzle 6 and because the position A of the sealing gasket of the dual-side portion of the raw material arrival downside conveyer belt that deadweight extends ₁Point, A ₂The detection method of point (being designated hereinafter simply as " sealing gasket in-position ") and the method for adjustment of this in-position describe.

As shown in Figure 3, sealing gasket in-position A ₁Point, A ₂Point, usually since its on minimum position, the gap between upper conveyor belt and the lower conveyor belt, thereby be difficult to from correctly holding its position with method such as visual on every side.At this, present inventors are through deep discussion, and having found can be extremely correctly and easily hold sealing gasket in-position A ₁Point, A ₂The method of point.

That is, one side is provided with generating laser in raw material supplying portion, and the apparatus structure of emission laser is very effective from this generating laser along direction of belt travel.And, behind raw material supplying portion base feed, the position in direction of belt travel of the sealing gasket of the dual-side portion of the raw material arrival downside endless belt conveyer that extends at width owing to conduct oneself with dignity can be detected by following method: for example, launch laser from generating laser along direction of belt travel, detect by in the light of the gas-liquid interface of raw material and atmosphere reflection with the perpendicular reverberation of direction of belt travel; And, its be put can adjust make its with respect to the amplitude of fluctuation of direction of belt travel in being less than or equal to the scope of 1m.According to such method, the supply inequality that occurs when continuous plate unit feeding raw material of detection difficult can be held highly indirectly by instant and precision in the past, and it is uneven to improve this supply well.But amplitude of fluctuation is the phase for a short time.

Fig. 4 is the schematic diagram that is illustrated in the state of the generating laser 15 that is provided for detecting the sealing gasket in-position on the belt type continuous plate device.

In generating laser 15, Wavelength of Laser is had no particular limits, can use He-Ne type or other desired type.In order to hold the sealing gasket in-position A of both sides ₁Point, A ₂Put the two, the quantity of generating laser 15 should be two.Illuminating part to generating laser 15 should be adjusted, and makes direct of travel that direction of light and downside transmit zone face keeping parallelism in fact.Laser of launching from illuminating part and the distance between sealing gasket should be 1～300mm.The straightaway abreast of emitted laser and sealing gasket is at sealing gasket in-position A ₁Point, A ₂On near the gas-liquid interface of the material liquid the point, reflect to all directions.In these reverberation, the operator who is positioned at continuous plate device side can be easy to confirm the reverberation vertical with direction of belt travel with visual, can hold sealing gasket in-position A accurately indirectly ₁Point, A ₂The change conditions of point.

When the supply of raw material of supplying with from nozzle 6 measures existing deviation, variation has taken place in the position of length direction in observable laser reverberation from the side of continuous plate device owing to the operator, so by adjust roll shaft up and down to 11,11 ' the distance of up-down rollers between centers, then can revise at an easy rate the variation of this position.

Generating laser 15 there is no need often to start when the continuous plate device moves, and is only confirming sealing gasket in-position A ₁Point, A ₂Make its starting just enough during point.

The raw material of sheet polymer can suitably be selected according to the sheet polymer as finished product.It is the manufacturing of methacrylic resin plate of primary raw material that continuous plate device of the present invention is particularly suitable for the methyl methacrylate.When making the methacrylic resin plate, should use the Polymerization of Methyl raw material that contains more than or equal to 50 quality %.Representative enumerating: single with methyl methacrylate or can with the mixture of other monomer of methyl methacrylate copolymer.Further also can enumerate: make the methyl methacrylate based polymer be dissolved in the slurry in methyl methacrylate or its mixture or the part of methyl methacrylate or its mixture carried out prepolymerized slurry.

But other the monomer as copolymerization can be enumerated, for example: the acrylate of acrylic acid first, ethyl acrylate, n-butyl acrylate, 2-EHA etc.; Methacrylate beyond the methyl methacrylate of EMA, n-BMA, methacrylic acid 2-Octyl Nitrite etc.; Vinyl acetate resin, acrylonitrile, methacrylonitrile and styrene etc.Consider the flowability of polymerism raw material, the polymer containing ratio of slurries should be modulated to and be less than or equal to 50 quality %.

In the polymerism raw material, also can add chain as required and move agent.Move agent as chain, can use the mercaptan of the first order, the second level or the third level that alkyl or replacement alkyl are for example arranged etc.Its concrete example can be listed below: n-butanethiol, i-butanethiol, n-octyl mercaptan, n-dodecyl mercaptan, s-butanethiol, s-dodecyl mercaptan and t-butanethiol etc.

And, in the polymerism raw material, add polymerization initiator usually.Can be listed below as concrete example: organic peroxides such as the own ester of peroxidating neopentanoic acid uncle, the own ester of peroxidating 2 ethyl hexanoic acid uncle, di-isopropyl peroxydicarbonate, the neodecanoic acid tert-butyl ester, the peroxidating neopentanoic acid tert-butyl ester, lauroyl peroxide, benzoyl peroxide, tert-butylperoxy isopropyl carbonate, peroxidized t-butyl perbenzoate, dicumyl peroxide, di-tert-butyl peroxide; 2,2 '-azo two (2, the 4-methyl pentane nitrile), 2,2 '-azodiisobutyronitrile, 1,1 '-azo two (1-cyclohexane formonitrile HCN) and 2,2 '-azo two azo-compounds such as (2,4, the 4-trimethylpentane).

In addition, also can add various additives in raw material as required, for example cross linking agent, ultra-violet absorber, light stabilizer, oxidation stabilizers, plasticizer, dyestuff, pigment, parting compound and propylene are multilayer rubber etc.And adding inorganic filler in the polymerism raw material just can manufacture of intraocular marble slab shaped polymer.

Utilize the thickness of the sheet polymer that the present invention makes to should be 0.3～20mm.

Below, by embodiment the present invention is done more detailed description, these are not limitation of the invention.Also have, " quality % " brief note is " % ", " mass parts " brief note is " part ".

Embodiment 1

In aggregate rate is 100 parts in 20% methyl methacrylate slurries (viscosity 1Pas, 20 ℃), adding is as the own ester of peroxidating neopentanoic acid uncle (Japanese grease (strain) system of polymerization initiator, trade name: パ-ヘサシ Le PV) 0.1 part and evenly mix for 0.005 part, obtained aqueous polymerism raw material as the dioctyl sodium sulphosuccinate of parting compound.This polymerism raw material deaeration in vacuum tank, use the device of Fig. 1, making thickness is that 5mm, width are the plate-shaped products 1 of 1300mm.

In the present embodiment, the device of Fig. 1 is: total length is 10m, two stainless steel endless belt conveyers 1,1 ' thickness be that 1.5mm, width are 1.5m, utilize oil pressure that last lower conveyor belt is all applied 3.0 * 10 ⁷The tension force of Pa.And,, the sealing gasket of polyvinyl chloride system is set as sealing gasket 7.

Uniformly-spaced arranged in the interval from the raw material supplying position to the heating starting position add up to 4 pairs up and down roll shaft to 11,11 ', right arrangement pitch X is 200mm to make roll shaft.Up and down roll shaft to 11,11 ' the stem portion of each roll shaft be that the stainless steel of hollow form is made by the core section, its outside is coated with rubber, also has the solid shafting of stainless steel at the two ends of each roll shaft.And, up and down roll shaft to 11,11 ' primary stainless steel cadre's the external diameter of each roll shaft be 70mm, the external diameter D that comprises rubber section is 80mm, width Z is 1600mm, the stainless steel wall thickness is 5mm, with interior straight roll shaft, the external diameter of solid shafting is 30mm to the tolerance of external diameter at 0.1mm, and the width of solid shafting is 125mm.In addition, to all roll shafts up and down to 11,11 ' adjust, making up and down, the axle base of roll shaft is 90.0mm.This 4 couple up and down roll shaft to 11,11 ' in, D/Z=0.05, D/X=0.40.

Roll shaft up and down to 11,11 ' in, the beam warp bearing of upside roll shaft 11 is bearing on the framework moving up and down.And, downside roll shaft 11 ' the beam warp bearing be bearing on the framework that is fixed in pedestal.

The length of heating region is 5m, have in inside 76 ℃ hot

water spray device

8,8 '.In this heating region, the stainless steel up-down rollers axle of equally spaced arranging the external diameter that adds up to 12 pairs of surfaces to be covered and be 140mm, width and be 1600mm by rubber to 4,4 ', the arrangement pitch that makes its roll shaft is 400mm.Use this hot water spray device 8,8 ' the rear of heating region, be provided with the long interval of 2m by far infra-red heater 9,9 ' heat-treat.

Device as above with endless belt conveyer 1,1 ' gait of march be 130mm/min when operation, making thickness is that 5mm, width are the plate-shaped products 1 of 1300mm.

Embodiment 2

In the device of Fig. 1, from the raw material supplying position to 4 couple in the interval of heating starting position up and down roll shaft to 11,11 ' in, as roll shaft begin several the second couples from raw material supplying position one side about to what use be: primary stainless steel cadre's external diameter is 130mm, the external diameter D that comprises rubber section is 150mm, width Z is 1600mm, the stainless steel wall thickness is 5mm, the external diameter of solid shafting is 20mm, the width of solid shafting is 125mm, the tolerance of external diameter at 0.1mm with interior straight roll shaft, and the axle base of roll shaft is adjusted into 160.0mm up and down, in addition, identical with embodiment 1, make plate-shaped products 2.This begin from raw material supplying position one side several the second couples up and down roll shaft to 11,11 ', D/Z=0.094, D/X=0.75.

Embodiment 3

The polymerism raw material after the deaeration, is utilized the device of Fig. 1 more large-scale than embodiment 1 occasion in vacuum tank, making thickness is that 3mm, width are the plate-shaped products 3 of 2800mm.

In the present embodiment, the device of Fig. 1 is: total length is 100m, two stainless steel endless belt conveyers 1,1 ' thickness be that 1.5mm, width are 3m, utilize oil pressure that last lower conveyor belt is all applied 8.0 * 10 ⁷The tension force of Pa.And,, the sealing gasket of polyvinyl chloride system is set as sealing gasket 7.

Uniformly-spaced arranged in the interval from the raw material supplying position to the heating starting position add up to 8 pairs up and down roll shaft to 11,11 ', right arrangement pitch X is 350mm to make roll shaft.Up and down roll shaft to 11,11 ' the stem portion of each roll shaft be that the stainless steel of hollow form is made by the core section, its outside is coated with rubber, also has the solid shafting of stainless steel at the two ends of each roll shaft.And, up and down roll shaft to 11,11 ' primary stainless steel cadre's the external diameter of each roll shaft be 138mm, the external diameter D that comprises rubber section is 160mm, width Z is 3100mm, the stainless steel wall thickness is 5.7mm, with interior straight roll shaft, the external diameter of solid shafting is 60mm to the tolerance of external diameter at 0.1mm, and the width of solid shafting is 300mm.In addition, with all roll shafts up and down to 11,11 ' the axle base of roll shaft up and down be adjusted into 168.0mm.This 8 couple up and down roll shaft to 11,11 ' in, D/Z=0.052, D/X=0.46.

The length of heating region is 48m, have in inside 80 ℃ hot

water spray device

8,8 '.In this heating region, the external diameter that equally spaced arrange to add up to 120 pairs of surfaces to be covered by rubber be 280mm, width be the stainless steel up-down rollers axle of 3100mm to 4,4 ', and to make the right arrangement pitch of roll shaft be 400mm.Use this hot water spray device 8,8 ' the rear of heating region, be provided with the long interval of 15m by far infra-red heater 9,9 ' heat-treat.

Device as above with endless belt conveyer 1,1 ' gait of march be 2.3m/min when operation, making thickness is that 3mm, width are the plate-shaped products 3 of 2800mm.

Comparative example 1

As from the raw material supplying position to 4 couple in the interval of heating starting position up and down roll shaft to 11,11 ', it is right that 4 pairs of roll shafts equally spaced are set, the external diameter D that its primary stainless steel cadre's external diameter is 47.6mm, comprise rubber section be 60mm, width Z be 1600mm, stainless steel wall thickness be the external diameter of 3.2mm, solid shafting be the width of 20mm, solid shafting be the tolerance of 125mm, external diameter at 0.1mm with interior straight roll shaft, and the axle base of roll shaft is 160.0mm about making, and the right arrangement pitch X of roll shaft is 150mm.In addition, all identical with embodiment 1, make plate-shaped products 4.This 4 couple up and down roll shaft to 11,11 ', D/Z=0.038, D/X=0.40.

Comparative example 2

From the raw material supplying position to the roll shaft up and down in the interval of heating starting position to 11,11 ' add up to 4 pairs, these 4 pairs of roll shafts are arranged becoming uniformly-spaced, X changes to 400mm with its arrangement pitch.In addition, all identical with embodiment 1, make plate-shaped products 5.This 4 couple up and down roll shaft to 11,11 ' in, D/Z=0.05, D/X=0.20.

Below, the evaluation to the thickness of slab precision is described

The method of the thickness of slab precision of evaluation goods 1,2 (embodiment 1,2) and goods 4,5 (comparative example 1,2) is as follows.At first, as shown in Figure 8, the plate-shaped products of making is continuously cut off every 1000mm along its length, obtain 50 blocks of plates that are of a size of 1300mm * 1000mm * 5mm.And, to all 50 blocks of plates, to the A point of the central part on the width of section and from B1, the B2 point mensuration thickness of the inside 100mm of both sides portion, with the difference of maximum and minimum of a value as thickness deviation amount W.

About the evaluation of thickness of slab precision,, mean that then the glacing flatness of plate on width is high more if the absolute value of this thickness deviation amount W is more little.

In addition, about the thickness of slab precision of goods 3 (embodiment 3), as shown in Figure 9, the size of 50 blocks of plates is decided to be 2800mm * 1000mm * 3mm, and B1, B2 point is decided to be the inside 200mm from both sides portion, in addition similarly evaluates with above-mentioned.

The evaluation result of above-mentioned plate is listed in table 1.

Table 1

Embodiment 4

Is employed length among the embodiment 1 that the heating region of 5m is divided into: preceding partly is that to maintain temperature be that 70 ℃ of relative humidity are that 70% length is the initial stage heating region 12 of 0.5m, later half be to use temperature be 76 ℃ hot water spray device 8,8 ' length be the heating region 8 of 4.5m, in addition, all identical with embodiment 1, making thickness is the plate-shaped products 6 of 5mm.At this, the holdup time of heating region 12 is 3.8min in the early stage.And, in order to hold the up and down programming rate of endless belt conveyer, begin from raw material supplying side opposed facing on post thermocouple respectively to measure variations in temperature on the surface of lower conveyor belt face.Consequently, the programming rate of initial 1 minute last lower conveyor belt is: the upside conveyer belt is that 21 ℃/min, downside conveyer belt are 22 ℃/min, and programming rate henceforth is lower value.

Embodiment 5

To employed length among the embodiment 4 is the initial stage heating region of 0.5m, and the use water temperature is that 85 ℃ hot water spray device heats, and in addition all identical with embodiment 4, making thickness is the plate-shaped products 7 of 5mm.The programming rate of initial 1 minute last lower conveyor belt is to go up lower conveyor belt to be all 63 ℃/min, and programming rate henceforth is for being lower than the value of 50 ℃/min.

Below, the evaluation to optical distortion is described.

Optical distortion with following method evaluation goods 6,7.As shown in Figure 7, plate-shaped products 6,7 (10) place obliquely make its become with ground 30 the degree angles, so that observe the section that plate-shaped

products

6,7 is (10) and direct of travel conveyer belt is perpendicular and make light arrive two sides from Halogen lamp LED 16, lay Halogen lamp LED 16 light injected from ground and the acutangulate side of sheet, the plate-shaped products 6,7 (10) that on the projection screen 17 that is configured on the opposite lateral boundaries, mirrors as available visual the evaluation.

In the evaluation of optical distortion, when the black and white inequality does not appear in the picture of projection, be judged as the good plate of no optics distortion; If when in picture, having found the deep or light decorative pattern of informal voucher or black and white, then be judged as the bad plate of quality with optical distortion.

The evaluation result of above-mentioned plate, W lists in table 2 with the thickness deviation amount.

Table 2

Embodiment 6

With respect to 100 parts of polyvinyl chloride, be mixed with equably: as 45 parts of the dibutyl phthalates of plasticizer (consonance fermentation (strain) system), as 10 parts in the calcium carbonate of carrier (white lapicide's industry (strain) system), epoxidised soybean oil (big Japanese ink chemistry (strain) system as heat stabilizer, trade name: エ Port サイザ-W100EL) 4 parts, carbonic acid metal salt (big Japanese ink chemistry (strain) system, trade name: グレ Star Network ML508C) 1 part, by this mixture hot forming, making external diameter is 16mm, wall thickness is 1.0mm, profile is that circle and section are the sealing gasket 7 of hollow structure.Except that using sealing pad 7, identical with embodiment 4, making thickness is the plate-shaped products 8 of 5mm.Compressive strength when under 76 ℃ sealing gasket 7 being compressed to thickness 5mm is 0.14N/mm, and the sealing gasket outer surface is 18mm with the contact width B that transmits zone face.

In the present embodiment, the accident that material liquid leaks into the sealing gasket outside does not take place in service continuously on 6th fully.

Embodiment 7

Except being blown into air, the hollow bulb to the left and right sides of sealing gasket 7 both sides make gauge pressure reach 4.0 * 10 ³Pa, outside, all the other are identical with embodiment 6, and making thickness is the plate-shaped products 9 of 5mm.

Embodiment 8

Except that external diameter is changed to the 7mm, all the other are identical with embodiment 6, make sealing gasket 7.And except that using sealing pad 7, all the other are identical with embodiment 4, and making thickness is the plate-shaped products 10 of 5mm.Compressive strength when under 76 ℃ sealing gasket 7 being compressed to thickness 5mm is 0.16N/mm, and the sealing gasket outer surface is 5.5mm with the contact width B that transmits zone face.

In the present embodiment, in service continuously on 6th observes the phenomenon that twice a spot of material liquid leaks into the sealing gasket outside.

Embodiment 9

Except with respect to 100 parts of polyvinyl chloride, with more 22 parts of the quantitative changes of dibutyl phthalate (DBP), and wall thickness changed to outside the 1.1mm, all the other are identical with embodiment 6, make sealing gasket 7.And except that using sealing pad 7, identical with embodiment 4, making thickness is the plate-shaped products 11 of 5mm.Compressive strength when under 76 ℃ sealing gasket 7 being compressed to thickness 5mm is 0.7N/mm, and the sealing gasket outer surface is 17.6mm with the contact width B that transmits zone face.

Embodiment 10

As shown in Figure 4, with main belt wheel 2 ' the position of the opposite side of direct of travel of conveyer belt on 2 generating lasers 15 (reason meeting of consulting and deliberating (strain) made, model NAL-6FL) are set, in addition identical with embodiment 7, make plate-shaped products 12.In service continuously on 6th for the catoptrical shift in position amplitude of seeing from as shown in Figure 4 operator's position of laser is limited within the 1m, has carried out suitable adjustment to the axle base of roll shaft up and down and has made it in the scope of 89.7～90.3mm.Also have, make all roll shafts up and down during adjustment 11,11 ' all axle bases with identical roll shaft up and down.

The above-mentioned thickness deviation amount W and the evaluation result of optical distortion amount are listed in table 3.

Result shown in the table 1 shows that plate-shaped products 1～3 (embodiment 1-3) has sufficient grazing as the LGP purposes.Wherein, the thickness of slab precision of plate-shaped products 2 (embodiment 2) is fabulous.On the other hand, when comparing with the plate-shaped products 6,7 shown in the table 2 (embodiment 4,5), the programming rate of the initial 1 minute last lower conveyor belt of initial stage heating region is the plate-shaped products 6 (embodiment 4) of 21～22 ℃/min, all is being better than the plate-shaped products 7 that programming rate is 63 ℃/min (embodiment 5) aspect thickness of slab precision and the optical distortion two.In addition, when comparing with the plate-shaped products 8～12 shown in the table 3 (embodiment 6～10), use has the grazing of the plate-shaped products 8,9,12 (embodiment 6,7,10) that the sealing gasket of specific compressive strength and contact width makes, and is better than plate-shaped products 10,11 (embodiment 8,9).Wherein, be blown into the plate-shaped products 9 (embodiment 7) that air makes to the hollow bulb of sealing gasket and have quite high grazing, be blown into air and generating laser is set to the hollow bulb of sealing gasket and make the catoptrical shift in position amplitude of laser be controlled at 1m to demonstrate with interior and plate-shaped products 12 (embodiment 10) that make and have high grazing.Corresponding with these, the thickness of slab low precision of plate-shaped products 4,5 (comparative example 1,2) not exclusively is suitable for the LGP purposes.

Table 3

Claims

1. belt type continuous plate device, by be configured to relative transmission zone face with same speed in the space that the relative transmission zone face of equidirectional two endless belt conveyers of advancing and the continuous seal pad of advancing with the state of the transmission zone face clamping of the dual-side portion that is positioned at them are surrounded, supply with the polymerism raw material from the one end, the polymerism raw material is solidified, take out sheet polymer from its other end; It is characterized in that:, and make its axle separately perpendicular with the direct of travel of conveyer belt right to configuration the heating starting position more than or equal to 3 pairs of roll shafts up and down that satisfy following formula (1) and (2) from the raw material supplying position;

Formula (1): D/Z 〉=0.04

Formula (2): 0.30≤D/X≤0.99

Wherein: the external diameter (mm) of D=roll shaft stem portion

The width (mm) of Z=roll shaft stem portion

The adjacent roll shaft up and down of X=is to each other axle distance between centers (mm),

Side is provided with generating laser in raw material supplying portion, launches laser by this generating laser along direction of belt travel.

2. belt type continuous plate device according to claim 1 is characterized in that, 3 pairs or the centering of roll shaft up and down more than it, has a pair of following formula (3) that satisfies at least;

Formula (3): 0.50≤D/X≤0.99

Wherein: the external diameter (mm) of D=roll shaft stem portion

3. belt type continuous plate device according to claim 1 is characterized in that, raw material supplying portion has following structure: raw material is flow into downwards from one or several pipe on the downside endless belt conveyer face between the sealing gasket of dual-side portion.

4. the manufacture method of a sheet polymer is characterized in that: use the described belt type continuous plate device of claim 1, make sheet polymer by containing the Polymerization of Methyl raw material.

5. the manufacture method of sheet polymer according to claim 4, it is characterized in that, to behind raw material supplying portion base feed because deadweight and the raw material that extends at width arrive the position of direction of belt travel of sealing gasket of the dual-side portion of downside endless belt conveyer detects, and to this position adjustment make its with respect to the amplitude of fluctuation of direction of belt travel in 1m.

6. the manufacture method of sheet polymer according to claim 4, it is characterized in that, by launching laser along direction of belt travel from generating laser, detect the perpendicular reverberation of direction of belt travel with the light that on the gas-liquid interface of raw material and atmosphere, reflects, with to behind raw material supplying portion base feed, because deadweight and the raw material that extends at width arrive the position of direction of belt travel of sealing gasket of the dual-side portion of downside endless belt conveyer and detect, and to this position adjustment make its with respect to the amplitude of fluctuation of direction of belt travel in 1m.

7. the manufacture method of sheet polymer according to claim 4, it is characterized in that, when two endless belt conveyers of advancing arrive the inlet of heating regions and temperature when rising beginning, regulates two endless belt conveyer both sides and make the maximum of its per 1 minute temperature rising smaller or equal to 60 ℃.

8. the manufacture method of sheet polymer according to claim 8, it is characterized in that, when two endless belt conveyers of advancing arrive the inlet of heating regions and temperature when rising beginning, in at least 30 seconds after the temperature rising beginning, the space that conveyer belt passes through is maintained at relative humidity, and temperature is 50 ℃～100 ℃ more than or equal to 50%.

9. the manufacture method of sheet polymer according to claim 4, it is characterized in that, employed sealing gasket is smaller or equal to 0.5N/mm in the compressive strength of heating-up temperature lower compression during to the thickness of sheet polymer, and, be more than or equal to 8mm at the transmission zone face and the contact width between the sealing gasket outer surface of heating-up temperature lower compression during to the thickness of sheet polymer.

10. the manufacture method of sheet polymer according to claim 10 is characterized in that, sealing gasket has hollow structure, is blown into air or inert gas to adjust the pressure of hollow bulb in the hollow bulb of sealing gasket.

11. the manufacture method of sheet polymer according to claim 11 is characterized in that, adjust sealing gasket hollow bulb pressure to gauge pressure 0～3.0 * 10 ⁴In the Pa scope.