JPH03500159A - Glass drawing method and furnace - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Glass drawing method and furnace 1 bean ball 1 The present invention relates to the processing of softenable non-conducting materials, and more particularly to the processing of softenable non-conducting materials. Drawing of clad and unclad fibers and fiber bundles from stage preforms 6 The present invention particularly relates to the introduction of glass fibers, fiber bundles, and composite products into a furnace. The present invention relates to a method for withdrawing a preform from a melted or softened end.

11 Dwarf I Glass drawing technology was used to produce continuous, flexible fibers, which later became fiber optic screens and fiber optic screens. The process of assembling into composite products such as face plates and various types of image modifiers. Current volume in the production of relatively short segments for processing is also an effective mode. Ru. In addition to being used for drawing fibers and composite fiber bundles, the present invention also involves This type of extraction technology is applied to later processing of composite products. mutual affection The process treatment involves cross-sectional reduction, either uniform or gradual. The latter technique is used for the formation of enlarged and reduced bodies. I did that Processing also includes forming image orientation devices such as partial rotors, inverters, etc. including various degrees of twisting and other manipulations.

An important objective in this technical field is the uniformity of heating and the A high degree of temperature control in the critical softening region of Failure to equalize work area heating is a leading cause of product defects and rejections, resulting in the loss of expensive materials and manufacturing time. These considerations lead to large, often distinct optical and physical magnitudes. and from preforms with very complex cross-sectional properties where thermodynamic properties can emerge. It is particularly critical in product formation.

The need for uniform heating limits traditional heating and withdrawal speed limits, as well as maximum criticality when upper limits on form and product cross-sectional shapes are achieved and exceeded. reach the state of the world. In this industry, there are demands to extract relatively delicate composite products. It is a goal of those skilled in the art to create uniform heating in a drawer furnace at a moderate temperature. It was not something I would recognize. The main reason for failure to achieve this goal is within Also, radiant heating at temperatures from below 1100 to below 1400 (600℃ to 750℃) It is difficult to equalize the heat radiation from the elements. Separate radiating elements are unavoidable. -Tends to produce uniform heating. Experiment to create a radiation source that continuously surrounds the molten area Attempts to embed individual elements in a diffusion matrix do not create the desired uniformity. won. Additionally, most composite products utilize radiant energy that is uniformly introduced. This complicates the problem of non-uniform radiation sources. However, it also limits the level of uniformity even for ideal homogeneous radiation sources.

This problem of absorption differences arises when different glasses are included in the same product and Any application with different infrared absorption properties (e.g. core versus cladding) or present in any product with extremely thick-walled preforms or drawer diameters. . In the latter case, the amount of heating due to absorption at the surface of the working area is due to the heat transfer directed towards the center of the object. It should be carefully controlled according to the conduction velocity. At each position toward the center, the convergence The radiant energy itself cannot penetrate at a level comparable to that at the working surface.

A conventional method has been developed that approximates a uniform radiant element. The method includes a preform and and the product on their common axis at a speed sufficient to smooth out variations in the radiant heating source. Includes turning. This technology harmonizes the rotation of the preform and product. Not only does it require a complicated mechanism for winding, but it also requires a Requires reel rotation and lateral transfer. At its best, this technique Produces horizontal (stratified) uniformity without producing directional uniformity, thereby This technology produces a hot “spot” instead of a “hot” ring. It does not address the issue of non-uniform absorption in the product.

The problem of non-uniform absorption is that the product has an infrared absorption tendency that is inversely proportional to the residual material. This is particularly true when light-absorbing elements such as MA cladding or fibers are included.

Such factors limit the internal anomalies of temperature and the selection of withdrawal speed in radiant furnaces. This results in increased and complicated viscosity.

A secondary consequence of the inability to achieve uniform heating in the withdrawal method is that Form size and reduction rate in the drawing process are severely limited. the result Composite products with very small diameter fiber optic components are Typically, such steps involve a single fiber. , pulling down multiple fiber bundles, pulling out multiple multiple fiber bundles, and after these This includes melting personal items to make them into Glocks. Such multi-step processing This is time consuming and each step has its own failure rate (on the order of 20%). Therefore, it is an object of the present invention to heat the preform to create highly controlled and uniform heating. The purpose is to provide a method of acting on the work area.

Another object of the invention is that the limitations on preform, product dimensions and drawer reduction are significant. The objective is to provide a highly expanded method.

Another object of the present invention is to provide a method for processing certain fiber optic processes without compromising quality. glazed panel, making it possible to eliminate at least one of the successive reduction drawers in the The goal is to provide a method for

Another object of the invention is to provide a method by which the dimensions of the working area in which reduction occurs can be selected and controlled. It is about providing. In another aspect, the invention particularly relates to a retractable preform. Provides an apparatus adapted to assist in the implementation of uniform heating of and control of the work area. .

Other objectives will become apparent from the description of specific embodiments.

January J and 1st The present invention is preferably created with a separate heating chamber and conducted with a draw-out chamber. 0 that uses a controlled high velocity flow of temperature controlled air or other fluid to enter the The method is a force-free pair for uniformly heating the working area of the preform. This method, which utilizes the temperature distribution characteristics of flow mixing, preferably uses a cooling fluid. Reduced flow of heat by back-circulating to a separate heating chamber for reheating 0 methods that include body removal to maintain the desired smooth temperature/time contour Data from temperature sensors at critical point locations in the flow cycle for fluid heating control including the use of

In another aspect, the method includes introducing a uniformly temperature-prepared preform into a work area. A small portion of the preform just outside the furnace draw-out chamber to ensure that This includes the requirements for ambient temperature regulation and different preforms. Reduces the requirement to compensate for different thermal conductivity of the system and preform clamping means let In practice, this step ensures that more heat from the furnace is applied to the preform than is desired. Forms an insulator that prevents damage from occurring.

Another aspect of the method of the invention includes determining the effective distance from the inlet to the outlet of the draw chamber of the furnace. includes controlled movement of an extensible insulation means to adjust, thereby The dimensions of the business area can be adjusted at will.

A further aspect of the invention is a drawer furnace particularly adapted to carry out the method. Ru. The furnace has a drawer chamber with a preform inlet and an outlet, and a controllable processing chamber. a preferably separate fluid heating chamber having a thermal element. Separate fluid addition The thermal chamber is in communication with the withdrawal chamber by an inlet passage or groove. The connection is strong mediated by convection control means.

In variations of both the method and apparatus, the preform inlet is located at the bottom of the furnace. , the product is drawn upwardly through an outlet at the top of the drawing chamber of the furnace. Stages of change and elements may be adopted separately.

The described method and apparatus are suitable for large diameter and possibly complex geometries in all dimensions. A retractable workpiece, which is a composite of materials with different copy-absorbing properties. A high-speed forced convection fluid is supplied to the working area, which solves the technical problem of uniform heating of objects. heat without producing the extreme differences in temperature encountered in radiant heating. Energy transfer is possible. Thus, surface hot spots or internal hot spots Avoiding spots is due to the amount of heat conduction into the workpiece or the small amount of free convection of dead air. Rather than relying solely on it, it can be controlled by the rate of forced convection and temperature regulation.

Furthermore, at a constant thermal energy application, the dimensions of the working area (drawing of the diameter-reduced profile) Technical issues of control (with respect to This can be easily resolved by lengthening it within the range.

Brief description of the drawing Both the method and the apparatus of the invention are illustrated in the drawings, which are given by way of example only and are not restrictive. It can be best understood by reference to the specific embodiments presented in .

FIG. 1 is a flow diagram of an embodiment of the method of the present invention.

FIG. 2 is a cross-sectional view of a furnace embodying the principles of the invention.

FIG. 3 is a simplified partial cross-sectional view of the pre-cooling cooler.

FIG. 4 shows a preferred form of drawer chamber inlet with adjustable diameter means. FIG.

FIG. 5 is a cross-sectional view of FIG. 2 taken along the line V-■, and is a specific example of the heated fluid dispensing means. is exemplified.

FIG. 6 is an exemplary diagram illustrating the operation of an adjustable insulating sleeve.

Figure 7 shows a modified device designed to perform an upward, not downward, withdrawal operation. FIG.

Noboru IB There are several modes of implementing the method of the invention, some of the details of which and processing raw materials. The following is satisfied, including the currently intended best mode: This is a detailed description of an application example. A detailed description of the specific design and configuration of the apparatus for carrying out the invention. A description is also provided here.

The method diagram shown in Figure 1 outlines the basic steps of the entire method. This method is based on calculated and experimental air temperature and flow data (very precise). In the optimal use of the one-piece method, first, the inlet Some degree of temperature control of the preform is required. This inlet temperature is not only the ambient temperature (the control of which is ineffective) but also the preform and its feed. It depends on the amount of conduction from the previous furnace through the mechanism. The impact of these factors is In the invented method, the temperature of the preform is "standardized" just before it enters the furnace. The temperature is lowered by the stage it brings to. This is the maximum at certain stages of the method of the invention. is also often a cooling phase, but depending on the ambient conditions it can also be a mild warming phase. Ru. The simplest implementation of this temperature standardization step 10 involves Bring the air at temperature and blow it around the preform at the point where it enters the furnace. Includes attaching. At the same time, the preform is available at the feed stage 11. It is fed into the drawing chamber of the furnace using a feed tlI side. This has a motor drive. Includes a driven screw. The feeding mechanism can be used if the core and cladding or multiple If the rad is to be driven at different speeds, several such drive screws are provided. It is possible. This feeding mechanism does not need to be equipped with rotation means, such rotation means being Achieving the furnace uniformity described in Figure 1 is a complex strategy with limited success. It is something that was given.

The most important aspect of the present invention is that air or other heat exchange fluid is used in the fiber drawing chamber. heating in a chamber preferably separate from the chamber. if If the chamber is not separated, at least the working area should be separated from the radiant elements used there. should be hidden from The heated air may then be conditioned in step 13. introduced into the drawer chamber using forced convection means, i.e. fans, air pumps, etc. Or distributed. The air heating stage 12 is preferably guided by a temperature measuring stage 14. controlled (e.g. by introducing a variable resistance or a controlled cooling gas system); This measurement is preferably performed as air is introduced into the draw chamber.

These measurements can be performed, for example, by inserting thermocouples into the air flow pattern. and by a preselection algorithm via electrical or electronic processing means. to control the air heating means.

This includes individual or continuous thermal control using calculated or table parameters. The feedback or feedforward process leading to configuration step 15 is may be included. This step also includes variable control of the heated air flow rate. this purpose is the opening of a temperature/time profile suitable for uniform heating of a particular preform in a particular work area. It originates from For this purpose, heated air is passed through the working area of the preform to form a stage Sent to 16. Although the preferred mode of flow is rather turbulent, the working area It has a directionality that runs through it in a strict direction. The incoming flow is at the inlet end of the draw chamber. It is also preferred to distribute the material around the preform.

When the preform is at working temperature, the combination of gravity and tensile forces in the drawing stage 17 The reduced diameter product is drawn in the usual manner using a drawer. Preform product withdrawal amount and that the amount of diameter reduction depends on both the temperature profile and the working area length (among other things). Additional work area shapes may be used in step 18. of the withdrawal method according to the requirements of the product and or properties of the preform, which can be previously set or It can be adjusted in various stages.

A satisfactory method of shaping the working area includes: from the inlet of the drawer chamber to the effective outlet; This includes changing the effective distance of the In detail, this is the exit of the drawer chamber. The insulating sleeve, which can be variably extended from the mouth to the inlet, is positioned concentrically with the drawer shaft. This can be achieved by

To facilitate temperature control, the heated air flowing through the work area is In step 19, it may be withdrawn from the chamber and reheated in a heating chamber. If additional If the air temperature measurement step 20 is carried out during air extraction, improved heating setting control is achieved. can be done. Such adjustments may be made, for example, on the basis of heat absorption measurements from temperature differences. obtain.

After product withdrawal, normal product processing is carried out, generally designated as step 21. be done. Rotating and reciprocating take-up reels may be provided for continuous fibers. addition A typical coating can be applied. For more discrete products, semi-finished products and Multiple and/or multiple element complexes for one or more processes Means may be provided for periodic cutting to bundle into a union.

This method provides extremely uniform heating, which allows for very large diameter preforms to be Because it is possible to withdraw products with very large diameters from the It is possible to feed the product from the bottom of the furnace to the top and then pull out the product from the top. It turned out to be useful. This modification method is based on the shape of the work area and the winding characteristics of the product. beneficially alters the influence of gravity on This modification method uses a relatively long slope with a gentle slope. Particularly applicable in work areas.

The entire method of the present invention can be used without the use of special control means. ) is applied to a composite preform that exceeds one It was drawn down to a diameter of 0.03 inches (0.08 cm) in stages. Prefo The chamber was standardized to approximately 70 below (21”C). It was heated so that it could be delivered under 1380°C (750°C). Air passes through the work area was force fed at high speed and extracted at approximately 1375″F (747°C). Manufacturing speed and product quality, which traditionally requires multiple steps for such reduction. It could also be compared to extraction by radiation.

In other cases, the heating uniformity of the method was excellent, starting from a 3-inch preform. Enables one-step production of 1-inch products with superior quality and production speed. Ta.

The preform was introduced into the furnace from below and rolled up from above.

No restrictions are found on the dimensions of the preforms to which the method can be applied successfully. won. When applied to traditional withdrawal methods, the manufacturing speed is currently normal speed limited by the capacity of the winding mechanism, which can be easily modified or It was nearly 5 to 6 times more.

This system can handle large diameter workpieces without deforming the workpiece during normal drawing operations. The ability to effectively deliver heat to a workpiece allows for particular uses of the system. Noh. Typically, large diameter products formed from a large number of fine fibers are stacking and melting of fibers under heating and under very high pressure for void removal formed by a highly inefficient process involving These large diameter products can be efficiently formed in the following manner. First, cut the fiber to the desired diameter. The preforms are shaped by stacking them into bundles that are slightly larger than the product. will be accomplished. The bundle is then placed into an airtight glass enclosure and the glass enclosure is then It is assumed to be empty. The resulting preform is then shaped into the desired shape. In embodiments of the invention, the diameter is reduced by only a small amount relative to the diameter. Passed. The result is a uniformly fused, void-free, undeformed fiber structure. A product with a large diameter is formed. This product cannot be slipped into the airtight plate. Ru. In practice, it is necessary to continuously apply a vacuum to the enclosure during the withdrawal period. can be obtained. Since the deformation caused by such a pull-out is very small, the workpiece can be It is possible to add a twisting motion to the This allows the product to have a uniform helix of fibers. It has an orientation. The finished product is used to form an image rotator or an image inverter. It can be cut into

Mustache 1 Apparatus specially designed for carrying out the method of the invention is disclosed in FIGS. 2 to 7. and is most comprehensively illustrated in a modified schematic embodiment in FIG.

Although forced convection furnaces have been available in the past, the furnace of the present invention has a unique combination with other elements. It is designed to take advantage of the special properties of forced convection in laminating and glazing operations. Application to forced convection heating glass drawing technology described in the shape is a special feature of this technology. unexpected and surprising diametral capacity, withdrawal speed and quality (product rejects). regarding maxims).

The overall combination as illustrated in FIG. 2 and designated generally by the reference numeral 30 includes a preferred or feed with capacity for differential feeding of the various components of a composite preform. A mechanism 31 is included. The feeding mechanism of the composite preform has the necessary airtight seal. The workpiece of the apparatus may include a vacuum assembly 32 and clamping means 33 for is a heat softenable, drawable preform 34. it against the preform temperature standardization or “precooling” immediately before entering the furnace (indicated overall by number 40). For implementation, this embodiment provides a supply via a conduit 37 with a controllable valve 38. Hollow collar 35 or thermal insulation supplied with relatively constant temperature air from a source 36 have a body. The "pre-cooling" air is directed inward and radially at number 39. It is directed inwardly toward the preform through a plurality of holes as shown. mark It is satisfactory and preferable to select 70"F (approximately 21"C), which is close to room temperature, as the standard value. It turned out to be convenient. finer control in maintaining a constant preform temperature. Temperature sensors are provided above and/or below the hollow collar 35 to achieve control. , air temperature and/or volume control.

Preform 34 is fed into furnace 40 through draw chamber port 41 . Applicable The inlet is preferably somewhat refractory to ensure mild resistance to heat loss. This is the “iris” assembly.

Drawer chamber 43 is one of two chambers included in this embodiment of the furnace; The chamber is a separate air heating chamber 44. The air heating chamber contains combustible, Heating means are provided which can be inductive, discharge inducing, non-conductive, etc. In the preferred embodiment, a large area resistance coil 45 is included. These include source 4 6 and a control mechanism 47 such as a variable impedance or variable transducer. be done.

A forced convection element 50 (high temperature fan, pump, etc.) draws air through the heating element. The flow is then directed through the groove 51 which communicates with the withdrawal chamber 43. like this Delivery is accomplished by an internal, radially perforated delivery means 52, such as a blennium. preferably mediated by

Temperature sensing transducer means 54 are provided at positions along the flow path and The signal is sent to the central control system 60.

The air flow can be actively or moderately drawn through the preform/workpiece, resulting in an effective draw. A working area 55 is created that terminates at or near the outlet chamber outlet 56 location. air The flow returns to the convection element 58 and also sends its signal to the central control system 60. Through the return groove 57 a return air temperature sensing transducer means 59 may be provided. Continued.

At the exit of the effective draw chamber there is a diameter adjusting means 59 similar to the diameter means 42 at the inlet position. The setting is obtained. The effective drawer chamber outlet 56 is in movable engagement with the actual outlet. A disconnection sleeve extending within the drawer chamber towards the opening 41 allows the actual outlet 61 to be is identified as The product is heated as it is pulled through the inner end of this disconnection sleeve. Shielded from heated streams. This movable position therefore defines the end of the working area 55. Ru. The position of the disconnection sleeve may be temporarily fixed by screws or clamps, or by a support. - by an elongating means 63 such as a rack and gear or friction wheel activated. It can be under variable central control.

The product is normally removed by a withdrawal mechanism 64 using gravity, traction means, etc. It is pulled out. The product is then transferred to a further processing element 65, i.e. the winding reel. It is sent to a roll, cutter, pandora, slicer, etc.

An effective hollow collar 35 may be constructed as shown in FIG. relatively constant temperature compressed air is passed through conduit 37 from a constant temperature air source such as a near compressor. into the empty collar 35 and through the radial holes 39 into the preform. Directed inward.

Figure 4, looking down at the drawer chamber inlet, shows the effective inlet diameter of the preform 3. 4 (representative single clad fiber - shown as an optical preform). An example of an adjustable diameter means 42 for accommodating is illustrated. similar mechanism may be used for the diameter adjustment mechanism 59 of the effective drawer chamber outlet 56.

FIG. 5 is a horizontal detail of the flow distribution means 52 taken along II V-V in FIG. 5 shows a detailed view of the flow distribution means 52 with an interior shaped to facilitate flow control; FIG. It is embedded in a toroidal brenum with side radial holes 53. Preferred ingredients In some embodiments, the inner radial bore is elongated along the axis of the workpiece.

Details of a dynamic embodiment of the adjustable sleeve 62 are shown in FIG. The adjustment state for this purpose is indicated by a dashed line. Adjustment is done by means of extension under a central control system 60. This is done by distracting 63. The elongation means are preferably annular.

Examples of method variations include feeding preforms from above the furnace and withdrawing products from above the furnace. , the full benefit of the present invention, which can be satisfactorily implemented in the apparatus of FIG. , obtain the best under the circumstances according to the device variation shown in FIG. An example of this change In this case, the furnace is mounted using a floating ring 70.71 that can be rotated at will in the longitudinal plane. be attached. In this case, the feeding mechanism 31 and the drawing mechanism 64 are They are repositioned to their respective appropriate positions.

As an alternative to the rotatable shape shown in Figure 7, the device can be rotated around the central horizontal plane. Can be configured symmetrically. Therefore, if only the inlet groove from the heating chamber to the drawer chamber is The flow distribution means may be centrally located. “Inlet” and “Exit” of the drawer chamber The area is then provided with a closeable return groove, an extendable disconnection sleeve, and a pre-cooling The hollow collar and hole diameter adjusting means are supplied in the same condition. In this way The reform is fed and the product is pulled upwards or downwards with equal ease. It can be done. The selection depends on the characteristics of the preform, product and manufacturing speed.

E"Ue" Kuchibiki Several modes of industrial applicability of uniform heating provided by the withdrawal method of the present invention. are readily apparent from the foregoing description of the device and its features, and are suitable for other uses and The profit is totally (unexpected).

In current radiant furnaces, the typical product rejection rate at each stage of the multi-stage manufacturing method is approximately It is 20%. The method and apparatus of the present invention significantly reduces this rejection rate.

The withdrawal speed for medium diameter products ensures complete and reasonably uniform heating of the preform. is largely limited by the need for a sufficiently slow speed to allow The method of the present invention has been developed for several products, even large diameter preforms. The speed is 5 to 6 times faster than that of conventional drawer furnaces, and the quality is even more satisfactory. heats quickly and evenly until it can be removed.

The method of the present invention reduces the radiation required for products incorporating radiation absorbing claddings and fibers. Generally no special handling is required compared to handling in a firing furnace. such products includes the most complex image manipulation products: faceplates, image extensions, inverters, etc. .

Most importantly, in traditional methods, typical composite products are manufactured through several steps. will be built. This is the rate of diameter reduction that can be achieved without deformation of the product relative to the preform. This is based on the fact that the size of is limited. A plastic that can be heated with threshold uniformity. There were also absolute size limits for the reform. The method of the invention comprises at least 4.5 inch (128all 1 and possibly larger composite preform) The working area of the preform, including the mold, can be heated uniformly.

this is: 1. Final production of large diameters at fairly normal speed ratios from product to preform. The product may be drawn and subjected to final compaction, annealing, devoiding, and shaping. Steps are probably eliminated.

2. One or more stages of many-many-type composite product manufacturing with very large reduction ratios. You can get the benefit of being able to eliminate floors. Eliminating such steps takes time and It not only saves labor, but also saves materials through unavoidable consumption and rejects. It will save you the loss of yellow body.

It means that.

Obviously, without departing from the substantial spirit of the invention and method embodiments, Minor changes in shape and structure may be made. Accordingly, the invention is shown and described herein. It is not desirable to limit the shape to the shape itself; It is desirable to include all of the content included in the document.

The invention has thus been described. Guarantee of newness and patent certificate is desired. The scope of the claim is: international search report

Claims (16)

[Claims] 1. A method for withdrawing a product from a breform, the method comprising: feeding the breform to the drawer chamber inlet and bringing the fluid to the breform's working temperature; The step of heating the heated fluid to above flowing through a breform until reaching a drawing temperature; drawing the product from the breform through the drawer chamber outlet; A method for extracting product from a breform, including: 2. The fluid is heated in a separate heating chamber and the heated fluid is drawn into the chamber. drawing the product from the braform according to claim 1, including the step of delivering the product to the way to get it out. 3. After the heated fluid is drawn through the work area, a pull is applied to reheat the fluid. from the breform of claim 2, including the step of removing and returning to the heating chamber. Method for withdrawing the product. 4. Measures the temperature of a heated fluid at selected locations at least well spaced apart and uses the measured temperature values to heat the fluid as well as draw the fluid into the chamber. 3. The breform of claim 3, including the step of adjusting the delivery to method for withdrawing the product from the 5. Pre-selected control of the portion of the braform that is about to enter the drawer chamber drawing the product from the braform according to claim 1, including the step of bringing it to temperature; How to do it. 6. At a preselected distance from the drawer chamber exit towards the chamber entrance. A method for producing a product from a bra-form according to claim 1, including the step of introducing a disconnection means. Method for withdrawal. 7. The breform is fed upwards from the bottom of the drawer chamber, and the product is fed into the drawer chamber. A product from the braform according to claim 1, which is lifted up from above the chamber and pulled out. A method for extracting. 8. A method for withdrawing a product from a breform, the method comprising: feeding the breform from below the drawer chamber; heating the breform to working temperature in a drawer furnace; and drawing the product upwardly from the draw-out furnace. method for. 9. A glass drawing device for drawing out breform to make a product, through a drawer chamber, a separate fluid heating chamber housing a fluid heating means, a groove; forced convection elements to deliver air from the heating chamber to the drawer chamber; a furnace comprising a draw-out chamber inlet, a draw-out chamber outlet; a breform feed mechanism adapted to feed the drawer chamber inlet; a product withdrawal mechanism adapted to withdraw the product from the discharge chamber outlet; A glass drawing device consisting of 10. Bringing the breform to a standardized temperature at the drawer chamber inlet location In order to produce a product by drawing out the brake form according to claim 9, which includes a means for Glass pulling device. 11. The means to bring the breform to a standardized temperature is through conduits. includes an air source coupled to a collar around the drawer chamber inlet, with the collar facing inward. Draw out the brake form according to claim 10 having holes oriented in Glass drawing equipment for making products. 12. extending and adjusting from the drawer chamber outlet toward the drawer chamber inlet. 10. The sleeve according to claim 9, further comprising a rupture sleeve having an elongated body to obtain a A glass drawing device that pulls out the reform and makes it into a product. 13. Claims including temperature measuring means positioned in the heated fluid stream A glass drawing device for drawing out the breform described in scope item 9 to produce a product. 14. includes a central control mechanism operatively coupled to temperature measuring means, thereby controlling and directing the heated fluid through the heating means and the forced convection element; by drawing out the brake form of claim 9 for controlling the heat delivered by the Glass drawing equipment for making products. 15. A central control mechanism is operatively coupled to and controls the disconnection sleeve adjustment means. A glass for producing a product by drawing out the breform according to claim 14. pulling device. 16. The breform is formed from a bundle of elements, and the device is airtight and evacuated. The bra foam according to claim 9, comprising an enclosure surrounding the foam. A glass drawing device for pulling out products.