CN1715225A - Forming device and method for producing thin plate material using downward drawing method in slit - Google Patents

Abstract

The downward drawing formation device and method for producing sheet material is applied in producing great size glass plate in low cost, high efficiency and high quality. The method includes leading homogeneous thermoplastic material into fluid distributing pipe, distributing the fluid in linear lengthwise decrement flow rate to automatic balance of static pressure, making thermoplastic material to flow downward to the connected channel and making the thermoplastic material to pass through the outlet in the bottom of the channel in homogeneous flow rate each unit length. The device of the present invention includes material pipe, joint connected below the material pipe, two fluid distributing units connected symmetrically below the joint and channel connected to these fluid distributing units and with slot of rectangular cross section.

Description

Utilize the long and narrow hole glass tube down-drawing to produce the molding device and the method for thin plate material

Technical field

The invention belongs to the glass ware forming Processes and apparatus, particularly a kind of molding device and method of utilizing the long and narrow hole glass tube down-drawing to produce thin plate material.

Background technology

At present in order in the manufacture method of producing sheet glass, U.S. US3,338, the method of a kind of what is called of No. 696 patent disclosures ' overflow fusion method ', its advantage is the sheet glass both side surface produced because of not contacting with any object, thus can obtain goodish surface quality, and can be under the situation that need not grind, directly cut, obtain required sheet glass finished product.

Yet, because when making large-scale sheet glass, pressure pipe (Isopipe) such as employed in ' overflow fusion method ', it is quite accurate that its designing technique not only needs, difficulty is high, and in process of production, the associated temperature control condition of being arranged in pairs or groups, very harsh again, therefore, for making traditional ' overflow fusion method ' to produce colory sheet glass, the dealer is in its production unit and successive process, and required cost of paying and maintenance cost are quite expensive naturally.Another shortcoming of ' overflow fusion method ' is that to produce suitable be sheet glass below the 0.5mm in order to make thickness to this kind processing procedure, this is because of the thin more easy-formation not more of glass, when utilizing ' overflow fusion method ' to make sheet glass still more, the sheet glass of its moulding is to be merged by two sheet glass to form, at this moment, because thin more sheet glass heat loss through radiation when moulding is fast more, cause two sheet glass to be difficult for merging, easily cause good article rate significantly to reduce.In addition, because when utilizing ' overflow fusion method ' to make sheet glass, sheet glass is to merge moulding at the root that waits pressure pipe (Isopipe) (root), therefore, in process of production, if etc. the root of pressure pipe (Isopipe) when any damage taking place causing residual bubble, its sheet glass of producing all will become defective products, at this moment, since root be with etc. pressure pipe one-body molded, so can't change impaired root separately, and need to change pressure pipes such as whole, its required cost that expends, manpower and man-hour are also considerable naturally.

Another kind of manufacture method of producing sheet glass is ' the drop-down method of forming of long and narrow hole '.' the drop-down method of forming of long and narrow hole ' is different with aforesaid ' overflow fusion method ', and its history that is used to make sheet glass is morning far beyond ' overflow fusion method '.In traditional ' the drop-down method of forming of long and narrow hole ', any divider is not set, only below its moulding pond, adorn the nozzle shaped device, this can be by U.S. US2,880, No. 551 patent is learnt, its advantage is the liquid level pressure unanimity in the fusion glass of passing through the nozzle shaped device, its shortcoming then is the temperature that is difficult for evenly controlling fusion glass in the moulding pond, cause by the glass temperature and the viscosity of nozzle shaped device inconsistent, and unstable, cause and can't accurately control sheet glass thickness, therefore, when utilizing ' the drop-down method of forming of long and narrow hole ' to make sheet glass, for effectively controlling the temperature of fusion glass, the size in moulding pond and volume can't be too big, so the effective width of the sheet glass of being produced is also little.

Succeed, though there is the dealer to improve the uppity shortcoming of fusion glass temperature, at U.S. US2, in No. 880551 patents, disclosed the molding device of forming by platinum divider and nozzle and replaced the moulding pool technology, and utilized platinum heating mechanism, effectively the temperature distribution of fusion glass in the control dispenser, make divider with the fusion glass uniformly distributing to jet exit, produce the sheet glass of large-size again with glass tube down-drawing.Because, in above-mentioned molding device, still need by the temperature of control dispenser temperature distribution with the control fusion glass, beginning can reach uniform flux and distribute, this measure will cause fusion glass when nozzle is pulled out, in the different temperature distribution of generation on glass, cause sheet glass when moulding, easily to produce unevenness and brush mark, increase the degree of difficulty of sheet glass moulding control on foot.

Summary of the invention

The purpose of this invention is to provide a kind of high quality and large size thin plate material, maintenance of equipment long and narrow hole glass tube down-drawing of utilizing easy, with low cost, that effectively promote production efficiency of making and produce the molding device and the method for thin plate material.

The inventive method comprises and will be melting shape homogeneous thermoplastic material importing dispense tube, make the homogeneous thermoplastic material by two rear flank of uniformly distributing to dispense tube, make that the flow longshore current body distribution piping both sides length direction of homogeneous thermoplastic materials is made linear decrease in dispense tube, and make flow unanimity in the dispense tube unit length, so that distribution of static pressure of thermoplastic material tends to balance automatically in it; Make the homogeneous thermoplastic material by uniformly distributing during, can vertically flow to downwards and be connected in the channel of dispense tube below, and make that the homogeneous thermoplastic material can be with the outlet by the channel root edge of the unit length flow of unanimity to the dispense tube both sides; Present device comprises in order to the feeder sleeve that imports thermoplastic material, the joint that is connected the feeder sleeve below, two dispense tube and channel; Two dispense tube are able to symmetry and are connected both sides, joint below; Make the thermoplastic material that imports by feeder sleeve enter two dispense tube respectively through behind the joint, and flow to the end of dispense tube respectively to both sides along the medullary ray of two dispense tube, and when stable state is produced, order is flowed within it and the flow that is the homogeneous thermoplastic material of melting shape is made linear decrease along the length direction of dispense tube both sides, and make the interior flow unanimity of dispense tube unit length, so that distribution of static pressure of thermoplastic material tends to balance automatically in it; Channel has the notch in the cross section that is rectangle, and the one end is connected with the root edge of two dispense tube along its length, and is conducted with two dispense tube; The homogeneous thermoplastic material that flows into two dispense tube with order by uniformly distributing to dispense tube two rear flank, can vertically flow to the outlet of channel root edge via the notch of channel downwards, and with the flow of unanimity by the outlet of channel root edge.

Wherein:

The homogeneous thermoplastic material eliminates its mobile static pressure loss in dispense tube by its potential energy in the dispense tube per unit length, and the static pressure of the thermoplastic material of arbitrary position in the dispense tube is reached unanimity.

The angle that the per unit length medullary ray of dispense tube length direction corresponds to its horizontal direction is designed to successively decrease to the dispense tube zygomorphy, with the uniformly distributing flow, and make the static pressure of the thermoplastic material of arbitrary position in the dispense tube reach unanimity.

The width of channel, be designed to make the homogeneous thermoplastic material flow in arbitrary unit length on the dispense tube to flow in the channel along the terrestrial attraction direction with self gravitation, order can be with the outlet by the channel root edge of the flow of consistent unit length through the homogeneous thermoplastic material of channel.

The pairing horizontal sextant angle of medullary ray of the per unit length of divider dispense tube all is made as identical, but the length direction of longshore current body distribution piping, then make the pairing caliber of dispense tube of per unit length be designed to distribution piping zygomorphy convergent, with the uniformly distributing flow, also can make the static pressure of homogeneous thermoplastic material in the dispense tube per unit length reach unanimity.

The width of channel, be designed to make the homogeneous thermoplastic material flow in arbitrary unit length on the dispense tube to flow in the channel along the terrestrial attraction direction with self gravitation, order can be with the outlet by the channel root edge of the flow of consistent unit length through the homogeneous thermoplastic material of channel.

After the homogeneous thermoplastic material passes through the long and narrow hole nozzle of outlet of channel root edge and below thereof in regular turn with consistent flow, produce the thin plate material of consistency of thickness according to glass tube down-drawing.

Two dispense tube are designed to according to Hydrodynamics Theory along forming of arbitrary position of its length direction that the potential energy of homogeneous thermoplastic material eliminates its mobile static pressure loss in dispense tube in it, and the static pressure of the thermoplastic material of arbitrary position in the dispense tube is reached unanimity.

Two dispense tube correspond to formed each horizontal sextant angle of its sea line along arbitrary place-centric line of its length direction, are designed to more toward two dispense tube ends, and its horizontal sextant angle is littler.

Be connected and be designed to make that the homogeneous thermoplastic material flow in arbitrary unit length can flow in the channel along the terrestrial attraction direction with self gravitation on the dispense tube in the channel width of two dispense tube root edges, order can be with the outlet by the channel root edge of the flow of consistent unit length through the homogeneous thermoplastic material of channel.

The pairing horizontal sextant angle of medullary ray of the per unit length of dispense tube all is made as identical, but the length direction of longshore current body distribution piping then makes the pairing caliber of dispense tube of per unit length be designed to distribution piping zygomorphy convergent.

Be connected and be designed to make that the homogeneous thermoplastic material flow in arbitrary unit length can flow in the channel along the terrestrial attraction direction with self gravitation on the dispense tube in the channel width of two dispense tube root edges, order can be with the outlet by the channel root edge of the flow of consistent unit length through the homogeneous thermoplastic material of channel.

The linking of channel below is provided with nozzle, can pass through nozzle by consistent flow to make the homogeneous thermoplastic material by channel.

Because the inventive method comprises that the homogeneous thermoplastic material is imported dispense tube, longshore current body distribution piping both sides length direction to be made flow unanimity in linear decrease and the unit length with flow and distributed with the static pressure of thermoplastic material to the both sides of dispense tube by uniformly distributing and tend to balance automatically, vertically flow to and be connected in the channel of dispense tube below and make that the homogeneous thermoplastic material can be with the outlet by the channel root edge of the unit length flow of unanimity downwards; Joint, symmetry that present device comprises feeder sleeve, be connected the feeder sleeve below are connected two dispense tube of both sides, joint below and are connected the channel that has the cross section notch that is rectangle in two dispense tube root edges.The pressure distribution of homogeneous thermoplastic material tends to balance automatically and is not subjected to restriction on its length direction in the dispense tube of the present invention, therefore, be specially adapted to produce the large-scale sheet glass of wideer and consistency of thickness, it is compared with traditional ' overflow fusion method ', not only with low cost, maintenance easily, and between operational period, the temperature of fusion glass in its divider, flow and pull speed all more easily are maintained at stationary state, effectively avoided tradition ' overflow fusion method ' when utilizing two sheet glass to melt to be combined into a slice sheet glass, because of intensive radiation cooling, cause two sheet glass merging the shortcoming that difficulty takes place in the moulding; Do not need to require harsh especially on present device and the environment, therefore, can significantly reduce and safeguard and maintain required cost.Not only make the high quality and large size thin plate material, and maintenance of equipment is easy, with low cost, effectively promote production efficiency, thereby reaches purpose of the present invention.

Description of drawings

Fig. 1,, the present invention produces the molding device structural representation stereographic map of thin plate material for utilizing the long and narrow hole glass tube down-drawing.

Fig. 2,, the present invention produces the molding device dispensing arrangement diagrammatic elevation view of thin plate material for utilizing the long and narrow hole glass tube down-drawing.

Fig. 3,, the present invention produces fusion glass flow distribution process synoptic diagram in the molding device divider of thin plate material for utilizing the long and narrow hole glass tube down-drawing.

Fig. 4,, the present invention produces dispense tube structural representation longitudinal sectional view on the molding device per unit length of thin plate material for utilizing the long and narrow hole glass tube down-drawing.

Fig. 5,, the present invention produces the molding device dispensing arrangement diagrammatic top view of thin plate material for utilizing the long and narrow hole glass tube down-drawing.

Fig. 6,, the present invention produces the molding device dispensing arrangement schematic transverse sectional view of thin plate material for utilizing the long and narrow hole glass tube down-drawing.

Fig. 7,, the present invention produces the molding device dispensing arrangement signal longitudinal sectional view of thin plate material for utilizing the long and narrow hole glass tube down-drawing.

Embodiment

Molding device and method that the present invention utilizes the long and narrow hole glass tube down-drawing to produce thin plate material are mainly according to Hydrodynamics Theory, design divider, and divider comprises dispense tube with specific profile and the channel with special width.

The forming method that the present invention utilizes the long and narrow hole glass tube down-drawing to produce thin plate material comprises: will be melting shape homogeneous thermoplastic material and import dispense tube, make the homogeneous thermoplastic material by two rear flank of uniformly distributing to dispense tube, make that the flow longshore current body distribution piping both sides length direction of homogeneous thermoplastic materials is made linear decrease in dispense tube, and make flow unanimity in the dispense tube unit length, so that distribution of static pressure of thermoplastic material tends to balance automatically in it; Make the homogeneous thermoplastic material by uniformly distributing during, can vertically flow to downwards and be connected in the channel of dispense tube below, and make that the homogeneous thermoplastic material can be with the outlet by the channel root edge of the unit length flow of unanimity to the dispense tube both sides.

Wherein dispense tube is when stable state is produced, the thermoplastic material flow that makes homogeneous in it and be the melting state is made linear decrease along the length direction of dispense tube both sides, and make flow unanimity in the unit length of dispense tube, so that distribution of static pressure of thermoplastic material tends to balance automatically in it, and make thermoplastic material by uniformly distributing to liquid distribution piping two rear flank, can vertically flow to channel downwards, and with the unit length flow of unanimity by the set long and narrow hole nozzle in channel below, produce the thin plate material of consistency of thickness along the divider length direction according to glass tube down-drawing.

Need special declaration at this, the present invention is with the enforcement aspect of glass material as one of thermoplastic material in each embodiment of the following stated.Only the present invention is not limited thereto when actual applying, and anyly is familiar with this skill person, utilizes Apparatus and method for of the present invention with other thermoplastic materials, produces other thin plate material, all belongs to the protection domain of institute of the present invention desire opinion.

As shown in Figure 1, the present invention utilizes the molding device of long and narrow hole glass tube down-drawing production thin plate material to be made of divider 20 and nozzle 50.

Divider 20 is made of feeder sleeve 10, joint 33, two dispense tube 32 and channel 40.

Feeder sleeve 10 is arranged at divider 20 tops, in order to import thermoplastic material, and in most preferred embodiment, the homogeneous fusion glass of thermoplastic material for having stirred.

Joint 33 is in order to connect feeder sleeve 10 and two dispense tube 32 respectively, make two dispense tube 32 be arranged in divider 20 both sides symmetrically, make the thermoplastic material that imports by feeder sleeve 10 enter two dispense tube 32 respectively through behind the joint 33 for fusion glass, and flow to the end 322 of dispense tube 32 along the medullary ray 321 of two dispense tube 32 to both sides respectively, be uniformly distributed to divider 20 both sides.

For reaching this purpose, two dispense tube 32 must be designed to make in it length direction linear decrease for the flow longshore current body distribution piping 32 of the thermoplastic materials of fusion glass.

Channel 40 is provided with the notch in the cross section that is rectangle, and the one end is connected with the root edge of two dispense tube 32 along its length, and is conducted with two dispense tube 32; Its other end is connected with nozzle 50, the fusion glass that flows into two dispense tube 32 with order by uniformly distributing to dispense tube two rear flank, can vertically flow to nozzle 50 places of channel 40 root edges via the notch of channel 40 downwards, and, produce the sheet glass of consistency of thickness along divider 20 length directions according to glass tube down-drawing with the outlet 501 of the flow of unanimity by nozzle 50.

For being described more specifically the flowing-path of fusion glass in divider 20 and how producing the sheet glass of consistency of thickness, special being that example is described in detail as follows as Fig. 2, Fig. 3, divider 20 shown in Figure 4:

In most preferred embodiment, flow through the fusion glass of divider 20 for order can be with the outlet 501 by nozzle 50 of the flow of unanimity, the medullary ray 321 of two dispense tube 32 must be according to Hydrodynamics Theory, according to special mathematical formula, calculation Design goes out the shape and the width of dispense tube 32 and channel 40, when making divider 20 under stable state, produce sheet glass, can make the flow of the fusion glass in the dispense tube 32 make linear decrease along dispense tube 32 length directions, and make flow unanimity in dispense tube 32 unit lengths, so that distribution of static pressure of fusion glass tends to balance automatically in it, and make fusion glass by 32 liang of rear flank of uniformly distributing to two dispense tube, can vertically flow to channel 40, and with the flow of unanimity by nozzle 50, produce the sheet glass of consistency of thickness along divider 20 length directions with glass tube down-drawing.

As shown in Figure 3, when fusion glass after feeder sleeve 10 is imported into joint 33, its flow Q will be divided into two, respectively to two side flow of two dispense tube 32, when flowing to the end 322 of two dispense tube 32 respectively, be the flow beginning vanishing of the thermoplastic material of fusion glass.

As shown in Figure 4, if two dispense tube 32 are corresponded to formed each the horizontal sextant angle θ of its sea line along arbitrary place-centric line 321 of its length direction _Z, be designed to more past two dispense tube 32 ends 322, its horizontal sextant angle θ _ZLittler, make the velocity of flow of the thermoplastic material in two dispense tube 32 slower more toward terminal 322 velocity of flow, even the flow for the thermoplastic material of fusion glass also in the dispense tube 32 can be made linear decrease along the length direction of dispense tube 32, and make the interior flow unanimity of dispense tube 32 unit lengths, to reach the purpose of uniformly distributing flow.

So, mobile is the thermoplastic material of fusion glass in arbitrary position on two dispense tube, 32 medullary rays 321, will be because of each corresponding horizontal sextant angle θ _ZDesign, can simultaneously eliminate its mobile static pressure loss dispense tube 32 in by its potential energy, what make arbitrary positions in the dispense tube 32 is that the static pressure of the thermoplastic material of fusion glass reaches unanimity and more tends towards stability.

Being connected in the channel 40 of two dispense tube 32 root edges also needs via flow dynamics analysis, suitably distribute to make the designed width of rebate that goes out to make, and the flow that the fusion glass that flow reaches unanimity on per unit length is consistent is by nozzle 50 via two dispense tube 32.In addition, because in divider 20, fusion glass are influenced vertically by terrestrial attraction to flow downward in the channel 40, therefore, most preferred embodiment is when the width of rebate of design channel 40, be to utilize this characteristic, the ability that fusion glass is flowed downward is reached by the weight of gravity or fusion glass itself fully, do not need fully it is applied extra reactive force, that is disobey the depended on pressure difference fully and keep flow on the unit length, the fusion glass of channel 40 of guaranteeing more to flow through can be produced the sheet glass of consistency of thickness with the outlet 501 by nozzle 50 of the flow of unanimity.

In view of the above,, only need to change the width of its outlet 501, can produce the sheet glass of different thickness by changing nozzle 50 if desire changes the thickness of the sheet glass of being produced.

In the most preferred embodiment, for the static pressure that makes the thermoplastic material of arbitrary position in two dispense tube 32 reaches unanimity, when designing dispense tube 32 according to mathematical formula according to Hydrodynamics Theory, because two dispense tube 32 one-piece constructions are the left-right symmetry shape, as Fig. 2, Fig. 3, shown in Figure 4, so at this only with one half hitch structure, according to black root-Bo Su flow equation formula (Hogen-Poiseuille equation), on the analysing fluid distribution piping 32 corresponding to the certain level angle theta _ZThe cross section flow of arbitrary position z as follows:

${\left(\frac{Q}{2}\right)}_z=\frac{\mathrm{\π}\×D^4}{128\×\mathrm{\η}}\×\frac{\mathrm{\ΔP}}{\mathrm{\ΔS}}$

Wherein:

Q is the flow (cm of fusion glass ³/ sec);

η is the viscosity (poise) of fusion glass;

D is the diameter (cm) of dispense tube 32;

ρ is the density (g/cm of fusion glass ³);

Δ S is that longshore current body distribution piping 32 medullary rays are by the flowing-path distance of a S1 to some S2.

Total pressure required when Δ P is mobile is poor.

At this moment, can be expressed as to the total pressure difference Δ P of some S2 by a S1:

ΔP＝P _s1-P _s2+ρ×g×ΔH

Wherein:

Δ H is a potential difference;

P _S1Be static pressure at a S1;

P _S2Be static pressure at a S2;

G is universal gravity constant 980 (cm/sec ²).

If required total pressure difference Δ P was provided by potential difference Δ H fully when fusion glass flowed, will can not cause static pressure poor when then flowing, i.e. P _S1=P _S2So the pressure gradient of the arbitrary position z on the length direction of dispense tube 32 can be expressed as:

$\frac{\mathrm{\ΔP}}{\mathrm{\Δs}}=\mathrm{\ρ}\×g\×\sin {\mathrm{\θ}}_z$

Therefore, dispense tube 32 is corresponding to the certain level angle theta _ZThe cross section flow of arbitrary position z, can be rewritten into as follows:

${\left(\frac{Q}{2}\right)}_z={\mathrm{<figure-callout\; id="1"\; label="K"\; filenames="A20041005009700231.png"\; state="\{\{state\}\}">K</figure-callout>}}_1\&times;\frac{D^4}{\mathrm{\&eta;}}\&times;\sin {\mathrm{\&theta;}}_z$

Wherein:

K ₁Be constant.

According to the above, because the flow of most preferred embodiment expectation fusion glass on the per unit length of dispense tube 32 can reach unanimity, in the fusion glass that meaning is promptly imported by feeder sleeve 10, half flow (Q/2) _InMake linear decrease along the length direction of dispense tube 32 respectively, its formula is as follows:

$\frac{d{(Q/2)}_{\mathrm{in}}}{dz}=-\mathrm{const}.$

If its entry condition of substitution $z=0\&DoubleRightArrow;{\left(\frac{Q}{2}\right)}_0={\left(\frac{Q}{2}\right)}_{\mathrm{in}}$ And end-point condition $z=\frac{\mathrm{<figure-callout\; id="2"\; label="L"\; filenames="A20041005009700231.png"\; state="\{\{state\}\}">L</figure-callout>}}{2}\&DoubleRightArrow;{\left(\frac{Q}{2}\right)}_{\frac{\mathrm{<figure-callout\; id="2"\; label="L"\; filenames="A20041005009700231.png"\; state="\{\{state\}\}">L</figure-callout>}}{2}}=0,$ And, can resolve to such an extent that its assignment of traffic formula is as follows through differential equation:

${\left(\frac{Q}{2}\right)}_z={\left(\frac{Q}{2}\right)}_{\mathrm{in}}\&times;(1-\frac{z}{L/2})$

By above-mentioned assignment of traffic formula, can determine the flow size of arbitrary position z on longshore current body distribution piping 32 length, afterwards relend cross section flow formula by dispense tube 32, can determine each position z horizontal sextant angle θ on the medullary ray 321 _ZCharacteristic all can not cause mobile static pressure loss.

As Fig. 5, shown in Figure 6, flow through the fusion glass of channel 40 for order can be with the outlet 501 by nozzle 50 of the flow of unanimity, most preferred embodiment is according to Hydrodynamics Theory, when calculating the specific width 401 of channel 40 according to numerical expression, the spy is considered as two flat boards that stand vertically and be parallel to each other with channel 40, and the fusion glass between two flat boards mobile be considered as the perpendicular flow of extending between flat board unlimited, in addition analytical calculation.In theory, under the stable-state flow situation, fit quality is kept weighing apparatus equation (Continuous equation), and only considers that it is as follows to get its fluid momentum equation (Navier-Stokesequation) along the flowing of terrestrial attraction direction y:

$0=-\frac{\&PartialD;P}{\&PartialD;y}-\mathrm{\&rho;}\&times;g+\mathrm{\&eta;}\&times;\left(\frac{{\&PartialD;}^{2}v}{{\&PartialD;}^{2}x}\right)$

Wherein:

V is the velocity of flow (cm/sec) of terrestrial attraction direction y;

Expression is poor along the flowing pressure of terrestrial attraction direction.

If bring its final condition into, resolve aforesaid equation, will try to achieve velocity of flow v, this moment is because for to analyze with infinite slab, so the flow of the unit length that its flow can the z direction

Expression, promptly $q=\frac{Q}{L}=\underset{-b}{\overset{b}{\&Integral;}}v\&times;\mathrm{dx},$ After resolving, can obtain following formula again:

$q=\frac{Q}{L}=-K\&times;\frac{b^3}{\mathrm{\&eta;}}(\frac{\&PartialD;P}{\&PartialD;y}+\mathrm{\&rho;}\&times;g)$

Wherein:

K is a constant;

Negative sign (-) is only represented the physical significance that flows downward;

B is a half-width (cm) of channel 40 notches.

In the most preferred embodiment, owing to do not need to be designed to flowing pressure poor dispense tube 32, only depend on the fusion glass self gravitation to flow, the fusion glass flow q in arbitrary unit length reaches unanimity on the dispense tube 32 so can make, therefore, desire to make dispense tube 32 interior unit length flows the fusion glass that is q to flow along the terrestrial attraction direction, in theory with own wt, this kind flows and not to be subjected to the y direction distance affects that flows, and channel 40 notches one half-width b can following formulate:

Q×η＝K ₂×b ³×L

Wherein:

K ₂Be constant;

L is dispense tube 32 length of length or divider 20 in the horizontal direction.

Therefore, according to the designed divider 20 of aforementioned formula, be in fusion glass under the operating environment of stable-state flow, the static pressure of the fusion glass of arbitrary position in each dispense tube 32 can be reached unanimity, and the fusion glass of the channel 40 of flowing through also can be with the outlet 501 of consistent flow distribution by nozzle 50.

Because in aforementioned most preferred embodiment, when the homogeneous fusion glass in divider 20 during steady flow, its internal pressure distributes and will be subjected to the restriction of divider 20 external forms, can automatically change toward equilibrium state, with reach order through the fusion glass in the channel 40 with the flow distribution of unanimity net result in nozzle 50 outlets 501.Therefore, based on as a same reason, in other most preferred embodiment of the present invention, also can be according to Hydrodynamics Theory and aforementioned mathematical formula, each dispense tube 32 and channel 40 are designed to other profile and width of rebate.

As shown in Figure 7, the embodiment of the invention also can be with the medullary ray 821 pairing horizontal sextant angle θ of the per unit length of divider 70 dispense tube 82 _ZAll be made as identical, but the length direction z of longshore current body distribution piping 82, then make the dispense tube 82 pairing caliber D of per unit length be the convergent state, so, also can make that the static pressure of fusion glass reaches unanimity in the dispense tube 82 per unit length, and order flow through the fusion glass of channel 90 can be with of the outlet 901 of consistent flow by channel 90.Present embodiment utilizes the profile of following two formula Fluid Computation distribution pipings 82 and the width of channel 90 respectively when design dispense tube 82 and channel 90:

${\left(\frac{Q}{2}\right)}_z\&times;\mathrm{\&eta;}={\mathrm{<figure-callout\; id="1"\; label="K"\; filenames="A20041005009700231.png"\; state="\{\{state\}\}">K</figure-callout>}}_1\&times;D^4\&times;\sin {\mathrm{\&theta;}}_z,Q\&times;\mathrm{\&eta;}={\mathrm{<figure-callout\; id="2"\; label="K"\; filenames="A20041005009700231.png"\; state="\{\{state\}\}">K</figure-callout>}}_2\&times;b^3\&times;L$

Wherein:

Q is the flow (cm of fusion glass ³/ sec);

η is the viscosity (poise) of fusion glass;

D is the caliber (cm) of dispense tube 82;

K ₁And K ₂Be respectively constant;

B is a half-width (cm) of channel 90 notches;

L is dispense tube 82 length in the horizontal direction or the length of divider 70.

As can be known described according to above-mentioned two most preferred embodiments, in design during dispense tube, no matter adopt caliber to fix but design that the pairing horizontal sextant angle of per unit length successively decreases along its length direction; Or adopt the pairing horizontal sextant angle of per unit length to fix but design that caliber successively decreases along its length direction; Sheet glass moulding viscosity or change of production need not accord with Q ₁* η ₁=Q ₂* η ₂Restriction.

In sum, the divider that goes out owing to aforementioned two most preferred embodiments are designed, can make the pressure distribution of fusion glass in the divider tend to balance automatically and be not subjected to restriction on its length direction, therefore, method and apparatus of the present invention is specially adapted to produce the large-scale sheet glass of wideer and consistency of thickness, it is compared with traditional ' overflow fusion method ', not only with low cost, maintenance easily, and between operational period, the temperature of fusion glass in its divider, flow and pull speed all more easily are maintained at stationary state, effectively avoided tradition ' overflow fusion method ' when utilizing two sheet glass to melt to be combined into a slice sheet glass, because of intensive radiation cooling, cause two sheet glass merging the shortcoming that difficulty takes place in the moulding.Though, the sheet glass surface that method and apparatus of the present invention is produced is not ' if overflow fusion method ' good, only because the quality on surface only need be via preliminary grinding, can reach requirement of client easily, so the present invention do not need to require harsh especially on equipment after the moulding and environment, therefore, can significantly reduce and safeguard and maintain required cost.

Claims (14)

1, a kind of forming method that utilizes the long and narrow hole glass tube down-drawing to produce thin plate material, it is characterized in that it comprise will be melting shape homogeneous thermoplastic material import dispense tube, make the homogeneous thermoplastic material by two rear flank of uniformly distributing to dispense tube, make that the flow longshore current body distribution piping both sides length direction of homogeneous thermoplastic materials is made linear decrease in dispense tube, and make flow unanimity in the dispense tube unit length, so that distribution of static pressure of thermoplastic material tends to balance automatically in it; Make the homogeneous thermoplastic material by uniformly distributing during, can vertically flow to downwards and be connected in the channel of dispense tube below, and make that the homogeneous thermoplastic material can be with the outlet by the channel root edge of the unit length flow of unanimity to the dispense tube both sides.

2, the forming method that utilizes the long and narrow hole glass tube down-drawing to produce thin plate material according to claim 1, it is characterized in that the homogeneous thermoplastic material eliminates its mobile static pressure loss in dispense tube by its potential energy in the described dispense tube per unit length, the static pressure of the thermoplastic material of arbitrary position in the dispense tube is reached unanimity.

3, the forming method that utilizes the long and narrow hole glass tube down-drawing to produce thin plate material according to claim 2, the angle that the per unit length medullary ray that it is characterized in that described dispense tube length direction corresponds to its horizontal direction is designed to successively decrease to the dispense tube zygomorphy, with the uniformly distributing flow, and make the static pressure of the thermoplastic material of arbitrary position in the dispense tube reach unanimity.

4, the forming method that utilizes the long and narrow hole glass tube down-drawing to produce thin plate material according to claim 3, the width that it is characterized in that described channel, be designed to make the homogeneous thermoplastic material flow in arbitrary unit length on the dispense tube to flow in the channel along the terrestrial attraction direction with self gravitation, order can be with the outlet by the channel root edge of the flow of consistent unit length through the homogeneous thermoplastic material of channel.

5, the forming method that utilizes the long and narrow hole glass tube down-drawing to produce thin plate material according to claim 2, the pairing horizontal sextant angle of medullary ray that it is characterized in that the per unit length of described divider dispense tube all is made as identical, but the length direction of longshore current body distribution piping, then make the pairing caliber of dispense tube of per unit length be designed to distribution piping zygomorphy convergent, with the uniformly distributing flow, also can make the static pressure of homogeneous thermoplastic material in the dispense tube per unit length reach unanimity.

6, the forming method that utilizes the long and narrow hole glass tube down-drawing to produce thin plate material according to claim 5, the width that it is characterized in that described channel, be designed to make the homogeneous thermoplastic material flow in arbitrary unit length on the dispense tube to flow in the channel along the terrestrial attraction direction with self gravitation, order can be with the outlet by the channel root edge of the flow of consistent unit length through the homogeneous thermoplastic material of channel.

7, the forming method that utilizes the long and narrow hole glass tube down-drawing to produce thin plate material according to claim 2, after it is characterized in that described homogeneous thermoplastic material passes through the long and narrow hole nozzle of outlet of channel root edge and below thereof in regular turn with consistent flow, produce the thin plate material of consistency of thickness according to glass tube down-drawing.

8, a kind of molding device that utilizes the long and narrow hole glass tube down-drawing to produce thin plate material is characterized in that it comprises in order to the feeder sleeve that imports thermoplastic material, the joint that is connected the feeder sleeve below, two dispense tube and channel; Two dispense tube are able to symmetry and are connected both sides, joint below; Make the thermoplastic material that imports by feeder sleeve enter two dispense tube respectively through behind the joint, and flow to the end of dispense tube respectively to both sides along the medullary ray of two dispense tube, and when stable state is produced, order is flowed within it and the flow that is the homogeneous thermoplastic material of melting shape is made linear decrease along the length direction of dispense tube both sides, and make the interior flow unanimity of dispense tube unit length, so that distribution of static pressure of thermoplastic material tends to balance automatically in it; Channel has the notch in the cross section that is rectangle, and the one end is connected with the root edge of two dispense tube along its length, and is conducted with two dispense tube; The homogeneous thermoplastic material that flows into two dispense tube with order by uniformly distributing to dispense tube two rear flank, can vertically flow to the outlet of channel root edge via the notch of channel downwards, and with the flow of unanimity by the outlet of channel root edge.

9, the molding device that utilizes the long and narrow hole glass tube down-drawing to produce thin plate material according to claim 8, it is characterized in that described two dispense tube are designed to according to Hydrodynamics Theory along forming of arbitrary position of its length direction that the potential energy of homogeneous thermoplastic material eliminates its mobile static pressure loss in dispense tube in it, reach unanimity the static pressure of the thermoplastic material of arbitrary position in the dispense tube.

10, the molding device that utilizes the long and narrow hole glass tube down-drawing to produce thin plate material according to claim 9, it is characterized in that described two dispense tube correspond to formed each horizontal sextant angle of its sea line along arbitrary place-centric line of its length direction, be designed to more past two dispense tube ends, its horizontal sextant angle is littler.

11, the molding device that utilizes the long and narrow hole glass tube down-drawing to produce thin plate material according to claim 10, it is characterized in that described the linking be designed to make that the homogeneous thermoplastic material flow in arbitrary unit length can flow in the channel along the terrestrial attraction direction with self gravitation on the dispense tube in the channel width of two dispense tube root edges, order can be with the outlet by the channel root edge of the flow of consistent unit length through the homogeneous thermoplastic material of channel.

12, the molding device that utilizes the long and narrow hole glass tube down-drawing to produce thin plate material according to claim 9, the pairing horizontal sextant angle of medullary ray that it is characterized in that the per unit length of described dispense tube all is made as identical, but the length direction of longshore current body distribution piping then makes the pairing caliber of dispense tube of per unit length be designed to distribution piping zygomorphy convergent.

13, the molding device that utilizes the long and narrow hole glass tube down-drawing to produce thin plate material according to claim 12, it is characterized in that described the linking be designed to make that the homogeneous thermoplastic material flow in arbitrary unit length can flow in the channel along the terrestrial attraction direction with self gravitation on the dispense tube in the channel width of two dispense tube root edges, order can be with the outlet by the channel root edge of the flow of consistent unit length through the homogeneous thermoplastic material of channel.

14, the molding device that utilizes the long and narrow hole glass tube down-drawing to produce thin plate material according to claim 9 is characterized in that the below linking of described channel is provided with nozzle, can pass through nozzle by consistent flow to make the homogeneous thermoplastic material by channel.

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