CN1015971B - Apparatus for continuously producing heat-shrinkable cress linked resin tub - Google Patents
Apparatus for continuously producing heat-shrinkable cress linked resin tubInfo
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- CN1015971B CN1015971B CN87104754A CN87104754A CN1015971B CN 1015971 B CN1015971 B CN 1015971B CN 87104754 A CN87104754 A CN 87104754A CN 87104754 A CN87104754 A CN 87104754A CN 1015971 B CN1015971 B CN 1015971B
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Abstract
The present invention relates to a device for continuously producing a shrink fitted cross-linking resin tube by cross-linking resin. The present invention comprises an extruding head section, a fluid, a cross-linking cylinder, an expansion mould, a cooling cylinder, a pair of conductors and a roller which are in a sequential connection form, wherein the extruding head section extrudes stock into a hollow tube, the fluid is sent into the tube to be expanded under pressure, the cross-linking cylinder is used for heating the tube-shaped resin to cross link the tube-shaped resin, the expansion mould expands the tube under fluid pressure, the cooling cylinder cools the tube, the conductors change the tube into a tabular shape, and the roller pressurizes the tube to pull the tube away from the extruding head section; the cross-linking cylinder continuously extends to the smooth inner surface of the cooling cylinder without obvious gaps and steps.
Description
The present invention relates to the device of the heat-shrinkable crosslinked resin pipe of a kind of continuous production.This pitch tube is applicable to the junction that coats various pipelines and cable and coat various tubing of protection and bar, to reach anticorrosion and adiabatic purpose.More particularly, but it has related to the device that a kind of mixture by crosslinkable resin is produced this heat-shrinkable pipe.
For to being used for the joint of the used band coating steel pipes of oil, coal gas, urban water, chemical plant and other occasion, perhaps antirust and adiabatic to the joint of the protection steel pipe that is used for power cable, communication cable used a kind of heat-shrinkable tubing usually.This it can carry out thermal contraction by heating, under the situation of sealing fully, cover these joints.But heat-shrinkable pipe is that portion causes molecular anisotropy by the structural change that the distortion because of the meltable mixture that ultra high molecular weight is arranged causes within it.And utilized after the various opposite sex forms, under situation about reheating, destroyed its directionality and recovered a kind of like this tubing of its reset condition.In producing this heat-shrinkable tubing, various synthetic resin have been used.In these resins, most interested is crosslinked synthetic resin now, for example crosslinkable polythene material.
The production of the crosslinked resin tubing of this flammable contraction, existing narration in Japan Patent 47-19356.Its technology has been used a kind of metal lining, for example, the aluminum pipe of many pores is arranged in its tube wall.
A kind of crosslinkable resin is pushed, be coated on the lining, the lining after the coating is successively by crosslinked chamber, expansion chambers and cooling chamber.Wherein, in crosslinked chamber, finish crosslinked.Then, in expansion chambers,, the pitch tube on the lining is expanded by the inside and outside pressure of control valve.Tubing after the expansion cools off in cooling chamber, again on a suitable belt reel.
Above-mentioned prior art technology has been used a kind of metal lining, resin is carried out extrusion coated thereon.Use metal lining to increase production cost.Metal lining finally will from around pitch tube take out, need loaded down with trivial details operation.Thereby, but be difficult to produce continuously under the situation of heat-shrinkable pipe, this technology be quite be not suitable for mass-produced.
Formerly have in the technical matters, the resin on the metal lining is expanded by pipe external and internal pressure in expansion chambers.Pipe is free state in expansion chambers, the outer surface of the pipe of not taked what measure to make to expand obtains certain support.Consequently, between external and internal pressure,, will cause overextended or expansion not enough as long as not balance is arranged slightly.Increase too much result owing to overdistension causes diameter, pipe may be wrinkling in cooling chamber.It has constituted obstruction but this prior art technology has been applied to another factor of the large quantities of quantity-produceds of heat-shrinkable pipe.
But heat-shrinkable pipe generally is by mixture being squeezed into tubulose and by the pipe in the crosslinked tube is heated continuously, forms that crosslinked crosslinkable resin synthetic makes.Normally used crosslinked tube is a tube that its inner wall surface is the such metal of stainless steel.Resin on the tubing after the extruding is bonded in or adheres to through regular meeting on the inwall of crosslinked tube.Usually, between the inwall of pipe after the extruding and crosslinked tube, apply oil,, prevent that resin from adhering to reduce the friction between them.Because some composition in the lubricating oil may work with the crosslinking medium of resin compound, perhaps some compositions may make resin compound that undesirable quality takes place to degenerate in the lubricating oil.Therefore, some lubricating oil can not use.Use lubricating oil that other problem also can take place, lubricating oil can not be assigned to the whole medial surface of crosslinked tube fully, and lubricated usefulness reduces, thereby causes adhesion.Therefore, with regard to a kind of method of adhering to of can be during crosslinked preventing of needs exploitations without lubricating oil.
Usually, but in producing thermal contraction and material, be lower than crosslinking temperature at the cross-linking process latter temperature but be higher than under the situation of softening temperature, but by expansion or increase pipe diameter and give pipe a heat-shrinkable.When keeping diameter constant, pipe is cooled to be lower than softening temperature.When stating previous technology on the implementation, in crosslinked chamber, be heated to awfully hot resin, entered under the situation of expansion chambers, still remained near the temperature the crosslinking temperature.High temperature like this also will be carried out resin in the expansionary phase crosslinked, but can not reach heat-shrinkable fully.Simultaneously, when stating previous technology on the implementation, because the heat affecting of expansion chambers makes the cooling effectiveness of cooling chamber reduce inevitably, therefore, cooling chamber must extend to certain length, thereby the total length of whole device has been increased.Simultaneously, also to add installation cost.
As mentioned above, but, heat-shrinkable pipe covers tubing and bar or their joint because being mainly used in, so, in order to guarantee the connection of pipe, through inner surface coating one deck tack coat of the pipe of being everlasting.A kind of we are familiar with, but form the technology of tack coat in thermal contraction pipe inner wall surface, but by realizing on the inner wall surface that binding material directly is added to established heat-shrinkable tube.Another kind of processing method, but in producing heat-shrinkable tube, adopted two extrusion techniques.Wherein, binding material and resin compound are all expanded, and form ectonexine simultaneously.But these are used for forming tack coat on the inner surface of heat-shrinkable tube prior art technology all runs into many problems.But add the technology of binding material on the heat-shrinkable tube that forms, needing increases some technological processes, and it will increase production cost.But two-layer the expansion simultaneously to form the technology of heat-shrinkable tube simultaneously, depend on need be quite expensive extruder and special two extrusion techniques of mould.But all being suitable for a kind of high efficiency method of cheapness, these two kinds of previous technologies do not produce the crosslinked resin heat-shrinkable tube that on inwall, adds one deck binding material continuously.
Therefore, main purpose of the present invention provides a kind of device through improving, but is used for producing the crosslinked tubing of thermal contraction continuously and can not appearing at and comprise the such problem of prior art technology of using metal gasket with a kind of low cost and high efficiency method.
But another purpose of the present invention provides a kind of device to be used for ceaselessly producing the crosslinked tubing of the thermal contraction with predetermined diameter with stable manner.
But the 3rd purpose of the present invention provides a kind of device that has improved in order to the crosslinked tubing of continuous production thermal contraction, it in addition under lubricated oil condition, it is bonding to prevent that also tubular resin from occurring in crosslinked cylinder.
But have the heat endurance improved and the crosslinked tubing of thermal contraction of heat-shrinkable but the present invention the 4th purpose provides a kind of can production continuously, this device has shortened length thereby has reduced total installation cost.
But providing, the 5th purpose of the present invention a kind ofly can produce a kind of thermal contraction crosslinked resin tubing that wall within it adds one deck adhesives that has continuously with inexpensive and effective method.
Get on very well simply, but the invention provides a kind of device that is used for producing continuously thermal contraction crosslinked resin tubing, it contains:
One comprises mould and is used for crosslinkable resin composition is squeezed into the extrusion head of hollow tubular product with the core rod that it matches, a fluid with certain pressure that is used for that is fitted together with extrusion head is directed to the device that is extruded in the tubing of extruding, a crosslinked tube that is positioned at the extrusion head downstream, be used to make the tubular resin mixture crosslinked, one be positioned at crosslinked downstream part be used to guide tubing and have along the dilatation mold of the ever-increasing inner wall surface of its diameter of flow direction, a cooling cylinder that is used to cool off tubing that is positioned at the dilatation mold downstream side, be positioned at the cooling cylinder downstream be used to make tubing become the guiding device of flat; Be positioned at the device that is used for tubing is pulled away from extrusion head in guiding device downstream, wherein, the inner surface of level and smooth seamless and step extends to cooling cylinder from crosslinked tube; And, guiding device comprises a nozzle that is positioned at the cooling cylinder downstream part, it is centered around the outer surface of the tubing that comes out from cooling cylinder circumferentially, the initial rounded cross section of nozzle inlet gradually becomes the outlet of elliptic cross-section, and nozzle places near the cooling cylinder outlet and its population remains constant to the inner edge girth in exit.
With device with said mechanism, but in order to the crosslinkable of making heat-shrinkable pipe but also there is not crosslinked resin to be pressed into crosslinked tube by the hole between extrusion die and the core rod with the shape of hollow tube, it is crosslinked to carry out in crosslinked tube constantly to heat tubing, then it is introduced in the extension module, the internal diameter of this extension module increases to outlet continuously and smoothly from the inlet that links to each other with crosslinked tube, then tubing is introduced cooling cylinder from the port of export of conical die maximum gauge, because pressure fluid is injected into the tubing inside that is extruded, the internally crosslinked and still awfully hot tubing of crosslinked tube because of the effect of pressure fluid along the expansion of extension module inner surface radial direction, but the tubing of having expanded and then in cooling cylinder, constantly cool off and obtained heat-shrinkable pipe.
The inner surface that extends to cooling cylinder from crosslinked tube is smooth continuous do not have slit and step, resin tubing to be extruded from crosslinked tube when cooling cylinder is introduced, the outer surface of tubing is supported by the inner surface of the continuous phase connection of each parts, if to a certain zone of cooling cylinder, slit or step are occurring from crosslinked tube, the pressure fluid that is used to expand of inlet tube inside forms differential expansion or inhomogeneous in this zone so, and tubing is moved has not steadily influenced continuous production.Because have inner surface smooth and continuous and that do not have slit and step from crosslinked tube to all parts of cooling cylinder, so the present invention has eliminated this trouble.
The device that the additives of reducing friction is added to the outer surface of the tubing that leaves extrusion head is positioned at from extrusion head outlet vicinity near the zone the crosslinked tube porch.The additives of reducing friction that add from charge door have reduced the friction between the inner surface of the outer surface of tubing to be extruded and crosslinked tube, prevented the bonding of resin, guaranteed that tubing to be extruded transmits along direction of transfer reposefully, thereby made tubing production smooth more.
Can on crosslinked tube inner surface, be equipped with and have the lining that the height of resin is broken away from ability and low-friction coefficient, for example fluoride resin.When promoting the moving stably continuously of tubing to be extruded even under the situation that does not have the above-mentioned additives that reduce to rub, can prevent that also resin is mutually bonding with crosslinked tube, this embodiment makes the heat-shrinkable crosslinked tubing of continuous production become possibility, it has eliminated inappropriate problem that above-mentioned use lubricating oil occurs, and promptly some lubricating oil compositions and resin work and do not have lubricating oil and cause bonding.Certainly, it has considered the additives that reduce to rub are added on the interior lining of crosslinked tube.
It also is possible being inserted into the adhesives supply line in crosslinked tube or the extension module, and the effect of this pipeline is adhesives, is typically the hot melt adhesion material and sprays into pipe material inner wall to be extruded formation one deck adhesives in crosslinked tube or in the extension module.But the configuration of adhesives supply pipe makes us do using common individual layer pressurizing unit to produce continuously under the big change situation and have the heat-shrinkable pipe that portion within it adds one deck adhesives to the head of pressurizing unit and it.
Guiding device can be a nozzle, and it is positioned at the below of cooling cylinder, preferably is adjacent to the cooling cylinder outlet, circumferentially is centered around the outer surface of the tubing that enters.Its shape of nozzle can resemble the suction tool of a dust catcher, and more particularly nozzle can be thought a circular cross-section at first, is merged into oval cross section gradually.The length that required designs of nozzles becomes to make inner core remains unchanged from their outlets that enters the mouth.In the present embodiment, when tubing from cooling cylinder when the nozzle, do not changing under its girth situation, it deforms and is flat.Should note the fluid that is used to expand is preferably in and be at least 0.1 kilogram/meter
2Pressure introduce down.If do not have its internal diameter from its inlet to the nozzle that all remains unchanged of outlet, thin-wall pipes will continue to expand after by cooling cylinder because of the fluid pressure of inside, but produce the final products that its internal diameter exceeds range of receiving.
Such as already described, but use nozzle will guarantee that stable production has the heat-shrinkable pipe of preliminary dimension.
Near the extension module inlet, can be furnished with Temperature-controlled appliance, in order to the temperature of pitch tube is controlled in the scope between resin crosslinks temperature and softening temperature.Therefore control device is when introducing dilatation mold by the tubing of crosslinked tube, and its temperature drops to the level that is lower than crosslinking temperature immediately, but to prevent between expansionary phase or the expansion back takes place crosslinked and reduced heat-shrinkable.Because the influence of high-temperature cross-linking tube to cooling cylinder avoided in the outfit of temperature control device, thus the efficient of cooling cylinder increased, so cooling cylinder can reduce length, reduced installation cost.Under low temperature condition, the effect that oil is rubbed as the reduction relatively poor owing to high viscosity presents of reduce to rub additives or lubricating oil.Under cooling cylinder lengthening situation, use the scope of high viscosity oil plant also to prolong, frictional force also is increased to the program that is difficult to pull straight tubing, reduces the heavy oil district by the length that reduces cooling cylinder is solid, and it is minimum that the trombone slide difficulty is dropped to.
Above-mentioned purpose of the present invention, characteristics and advantages accompanying drawing will be clearer by the description of reading following most preferred embodiment, wherein,
Fig. 1 is the axial section of principle of producing the device of tubing according to an embodiment of the invention continuously.
Fig. 2 has the crosslinked cylinder of lining and the profile of dilatation mold amplification partly in this device.
Fig. 3 produces the principle axial section of the device of tubing corresponding to Fig. 1 according to another embodiment of the present invention continuously, wherein is furnished with the adhesives pipe.
Fig. 4 is the profile of the another kind of layout of adhesives pipe.
Fig. 5 is the principle axial section that is similar to the device of Fig. 1 continuous production tubing according to still another embodiment of the invention, wherein is furnished with outlet nozzle.
Fig. 6 is the axial section of getting along Fig. 5 VI-VI line.
Fig. 7 is the nozzle segment transverse cross-sectional view along Fig. 5 VII-the VII line is got.
Fig. 8 is the nozzle segment transverse cross-sectional view along Fig. 5 VIII-the VIII line is got.
Fig. 9 is the perspective view of the chamfered portion of used nozzle in Fig. 5 device.
Figure 10 is the principle axial section that the device of continuous production tubing according to still another embodiment of the invention is similar to Fig. 1, has wherein inserted insulator between each parts.
But Figure 11 is the temperature profile that has shown viewed cast resin in the production heat-shrinkable pipe of the device that uses Figure 10.
But Figure 12 has used viewed tubular resin temperature curve map in the device production heat-shrinkable pipe of Figure 10 having omitted insulator.
Referring to Fig. 1, it illustrates a kind of device of continuous production tubing according to an embodiment of the invention.
This device contains an extruder head 3, and this extrusion head 3 comprises a dilatation mold that is general cylindrical structure 1 with vertical center axis and the coaxial general cylindrical core rod 2 of being of mould that is positioned at.The bottom of the extruded hole 3A of continuous circular shape between dilatation mold 1 and core rod 2 forms.Extruded hole 3A links to each other with pressurizing unit body (not shown) by carrying resin material passage 4.Pressurizing unit forces crosslinkable resin compound 15 to press to head 3 by passage 4 under certain pressure, thereby resin extruded is become hollow pipe 5.Core rod 2 is furnished with axially extended passage 6 the liquid with certain pressure is added in the inside of the pipe 5 of 3A formation from outer liquid body source (not shown).
The dilatation mold that is frustum 10 with inner surface 10A is positioned at the below of crosslinked tube, the diameter of inner surface 10A from the top or the porch to the below or the continuous increase in exit.In illustrated embodiment, the direct and crosslinked cylinder of the conical arrival end of mould 10 links to each other.The cooling cylinder 11 that equals mould outlet with its internal diameter that links to each other with the flaring exit of mould 10 is positioned at the below of dilatation mold 10, and cooling cylinder 11 is cylindrical drum that have water-cooled or air cooling cover.
Is the smooth continuous surface that does not have obvious gaps and step from crosslinked tube 7 to the inner surface that cooling cylinder 11 extends.
Owing to receive from the tubing of cooling cylinder 11 and make it be deformed into the guiding device 12 of flat cross section below cooling cylinder 11.Guiding device 12 comprises a nozzle, it be centered around circumferentially tubing in the cooling cylinder around, and it is designed to cross section, the rounded hole of initiating terminal, be elliptical aperture cross section shape then gradually.The draw-gear 13 that occurs with paired roller 13A and 13B form is positioned at the below of guiding device 12, in order to down to pull flat tubing 5 from guiding device 12, simultaneously in relative side pressurization.Draw-gear 13 provides drop-down drag and pressure.The reel (not shown) is positioned at the below of draw-gear.Reel can be positioned at the below or the side of traction roller.
Adopt said apparatus, can be by the crosslinkable resin compound of following step, but be typically the crosslinked tubing of polyethylene production thermal contraction.
The pitch tube 5 of Non-crosslinked is squeezed in the crosslinked tube 7, as mentioned above, gravity and with the rotation nip drum 13A that the take-up force of scroll (not shown) interrelates, under the pulling force of 13B, move down gradually by crosslinked tube 7.In by tube 7 processes, tubular resin carries out heat cross-linking, in this stage, the expansionary force of managing 5 pressurized fluids is pressed to the inner surface of crosslinked tube 7, and the anti-friction agent that adds is used for reducing crosslinked tube 7 inner surfaces and manage frictional force between 5 outer surfaces thereby the pipe of extruding moves down reposefully, can not be bonded to or adhere on the cylinder.
Crosslinked then pitch tube 5 is by dilatation mold 10, and at this moment, pipe 5 is warm still, so it can be under the effect of the expansionary force of pressure fluid, and the expansion inner surface 10A expansion along mould 10 increases its diameter gradually.Dilated pipe 5 arrives cooling cylinder 11, here is cooled near room temperature, forms a heat-shrinkable crosslinked tubing.Because from crosslinked tube 7 inner surfaces to cooling cylinder 11 is smooth, continuous and the aforesaid gap of neither one, sink or step, therefore pipe can move down reposefully, and under the fluid pressure that is used to expand, can not produce the protruding or uneven of any part.
Then, pipe 5 is out of shape by nozzle 12 or narrows down, by puck 13A, 13B flattens fully, and the pipe that has flattened is wound onto (not shown) on the roller.Pipe 5 is by puck 13A, and 13B pressurizes and the tube interior space segment before the roller is formed hermetic sealing, and therefore, fluid pressure can effectively be used for expansion.
Fig. 2 has provided an embodiment, wherein, and at lining 20 of inner surface formation of crosslinked tube 7 and dilatation mold 10.Lining 20 is to have the material of high release property and low-friction coefficient in order to the resin compound of making pipe.The material of shown lining comprises fluoride resin for example polytetrafluoroethylene (PTFE) and pottery.Lining 20 can form with coating fluoride resin or similar wadding method, or inserts the lining of a moulding in advance.
Lining 20 prevents that tubular resin is solidified to crosslinked tube inner surface and reduces frictional resistance between the dilatation mold 10 of crosslinked tube 7.Therefore, the use of lining 20 can be saved the use anti-friction agent, from and cancelled the hand-hole 9 Fig. 1.Certainly, can be when being equipped with lining 20 also 9 add anti-friction agents from the hole.
Another preferred embodiment represents in Fig. 3, roughly the same among it and Fig. 1, and identical here part is marked with identical numeral.In this embodiment, pressure fluid service duct 6 is form in core rod 2, and it departs from central axis, but is parallel to this axis.Form another one through hole 21 on the axis of core rod 2, conduit 22 extends in the crosslinked tube 7 by it, is used for from outside input adhesives, and adhesives conduit 22 has some spray-hole 22A at its end.In the embodiment of the explanation of this figure, spray-hole 22A is configured in the crosslinked tube 7.
When producing heat-shrinkable pipe with the device of Fig. 3, adhesives, be typically hot melt adhesion material hole 22A by conduit 22 under molten state and be sprayed onto from the head 3 on the inner surface of the pipe 5 of crosslinked tube 7 expansions, a tube cooling and a hardening so layer of adhesive material 18 of formation on the inner surface of pipe, layer of adhesive material 18 are cooled.Can produce the heat-shrinkable crosslinked tubing that layer of adhesive material is arranged on the surface within it so continuously.
Though in the embodiment shown in fig. 3, adhesives is injection in crosslinked tube 7, and adhesives conduit 22 can further extend downwards, so hole 22A is configured in the dilatation mold 10, and adhesives is injected in dilatation mold on the inner surface of pipe like this.
Fig. 4 has illustrated the layout of another kind of pressure fluid transfer passage and adhesives conveyance conduit.Pressure fluid transfer passage 6 stretches into the direction of aiming at the central axis of core rod 2.Adhesives carrier pipe 22 is by the coaxial centre that is configured in passage 6, and the gap between them is G.
Fig. 5 has illustrated another kind of preferred embodiment to Fig. 9, and it is particularly suitable for making the heat-shrinkable tubing of thin-walled.This embodiment uses a nozzle 121 as guide, is used for making pipe 5 distortion that come from cooling cylinder to be flat.Nozzle 121 surrounds whole circumference of pipe 5.
More particularly, nozzle 121 is combinations of segment 121A and 121B, and as shown in Figure 9, it is separated along the vertical plane of crossing central shaft.Nozzle 121 has the top or the arrival end that link to each other with the bottom or the port of export of cooling cylinder 11.Nozzle 121 is at the interior shape of horizontal cross-section mouth, and promptly the cross section perpendicular to central shaft is such, and nozzle presents in the porch and adjacent cooling cylinder 11(Fig. 7) same cross section, and be combined into oval cross section gradually to the low side or the port of export.In the exit of foot, nozzle has a non-circular cross-section, and it is at a pair of straight flange that is linked to each other by the semicircle limit shown in Figure 8.As clear expression among Fig. 8, oval cross section has a minor axis diameter that is equivalent to the twice of pipe wall thickness t, and the minor axis straight line is the distance between a pair of straight flange.Nozzle 121 is designed to that its internal circumference remains unchanged in the level cross-sectionn, and perhaps the diameter that exports from entering the mouth to cooling cylinder is the same.More particularly, when cooling cylinder 11 had an inside diameter D o, nozzle 121 had an internal diameter that equals Do in its porch, as shown in Figure 7.Therefore, internal circumference equals π Do.The inner circumferential cross section of nozzle 121 during this period, keeps internal circumference to equal π Do progressively smoothly from the oval transition to its exit of the circle of its porch.The inside non-circular cross-section of nozzle 121 has the minor axis diameter and the major diameter that equals [π (Do/2-t)+2t] that equal 2t in its exit, as (lubricant film thickness is ignored) that Fig. 8 found out.
In this embodiment, the pipe 5 that leaves cooling cylinder 11 is imported into nozzle 121 immediately, and there, its cross section becomes ellipse from circle, becomes pancake at last, changes consistent with the inner periphery cross section of nozzle 121.Because the value that the interior section girth of nozzle 121 is maintained fixed from its outlet that enters the mouth, pipe 5 is directed downwardly under the situation that its girth remains unchanged, and has eliminated the possibility that pipe increases its girth by the effect of managing the intramedullary expansion fluid pressure after leaving cooling cylinder 11.This has just guaranteed consistently, but has stably produced the heat-shrinkable pipe with fixed diameter.
Further preferred embodiment is represented in Figure 10.Wherein, the temperature control equipment that occurs with cooling jacket form is used for making pipe 5 to remain below crosslinking temperature and is higher than on the temperature of resin softening point, and it is configured in the top of dilatation mold 10, just the porch of dilatation mold.In addition, between the inlet of the outlet of extruder head mould 1 and crosslinked tube 7, between the inlet of the outlet of crosslinked tube 7 and dilatation mold 10, between the inlet of the outlet of dilatation mold 10 and cooling cylinder 11, put into insulator 26,27,28, be used for stoping respectively mutual heat transmission.Heat insulator can be the material of low thermal conductivity, as pottery.Certainly, the insulator between two adjacent components is connected to form smooth and continuous inner surface.
But Figure 11 has explained through diagrams when using Figure 10 device to make heat-shrinkable pipe by crosslinkable resin, the curve of the temperature that occurs on the different position of resin extruded direction.In order to compare, Figure 12 illustrates and is using except heat insulator 26,27,28 and temperature control equipment 25 are omitted, during other device production similar pipe identical with Figure 10, and similar temperature curve on the resin extruded direction.The structure that it should be noted that the latter also within the scope of the invention.
As what obviously find out from Figure 12, in this embodiment, heat insulator 26,27,28 and temperature control equipment have been removed.The temperature of tubular resin is under the heat affecting of heating or crosslinked tube 7, and the place before head 3 extruding has increase slightly.Along with pipe 3 advances to crosslinked tube 7 from the head, temperature is increased to the crosslinking temperature scope gradually.Along with pipe advances to cooling cylinder 11 from crosslinked tube 7 by dilatation mold 10, temperature suitably reduces under the effect of cooling cylinder 11 then, and in fact the cross-linking zone of Chan Shenging does not overlap with the zone that extends to the exit from crosslinked porch.Then should the zone usually from the inlet of the crosslinked tube 7 position P under slightly
1Extend to the position P at the following slightly place of inlet that is positioned at dilatation mold 10
2This is called effective cross-linking zone.If the low side P of effective cross-linking zone
2Be positioned at more the below, then crosslinked may occurring in the dilatation mold 10 in the pipe process of expansion even after this, but this causes the heat-shrinkable of pipe not enough probably.The heat affecting of crosslinked tube can cover the zone of cooling cylinder 11, and it can reduce cooling effectiveness.For tubular resin is cooled to low temperature fully, cooling cylinder must suitably prolong, the elongation of cooling cylinder means that use also will extend as the zone of the thick oil of anti-friction agent, and it has caused stoping pitch tube toward drop-down frictional force undesirable increase to take place.Furtherly, owing to just be heated before leaving extruder head 3 at resin under the heat affecting of crosslinked tube 7, as previously mentioned, resin is easy to be burnt or be bonded in the extruder head 3.
In contrast, most preferred embodiment shown in Figure 10 can eliminate any heat affecting between the parts fully, and extruder head 3 in this embodiment, crosslinked tube 7, and the heat between dilatation mold 10 and the cooling cylinder 11 is transmitted insulated body 26,27,28 blocking-up.In addition, temperature control equipment 25 approaches the porch of dilatation mold 10, can the strict temperature of controlling dilatation mold 10.Therefore, effectively cross-linking zone in fact is limited in the scope of crosslinked tube 7.In more detail as shown in figure 11, in fact, resin is not to be heated to leave extruder head 3 always.Along with tubular resin enters crosslinked tube 7, it is subjected to unexpected rapid warm raising, up to crosslinking temperature.Along with it comes out and enter dilatation mold 10 from crosslinked tube 7, it is subjected to a temperature drop fast.Along with it enters cooling cylinder 11, its temperature is further reduced to aforesaid low temperature.This can be avoided being experienced in as shown in figure 12 the device, during the expansionary phase or occur crosslinked possibility later on, but guarantees that the pipe of making has enough heat-shrinkables.Owing to improved the efficient of cooling cylinder 11, allow to shorten cooling cylinder, thereby reduce the total length of device.The reducing of cooling cylinder 11 length caused using the zone as the thick oil of anti-friction agent, reduced frictional resistance, is convenient to steadily pulling out of pitch tube.Owing to prevented that resin heated phenomenon in extruder head 3 occurs under the heat affecting of crosslinked tube T, the phenomenon that resin is burnt before crosslinked can not take place.
Be appreciated that insulator shown in Figure 10 26,27,28 can replace with forced cooling device.The coolant jacket that for example has same effect.Also can in extrusion die, dispose a coolant jacket, be burnt there in order to prevent resin.
Provided the heat-shrinkable optimum temperature curve of making by crosslinkable polyvinyl resin mixture below.Resin enters extruder head 3 under about 125 ℃ temperature, be heated to about 250 ℃ so that in crosslinked tube 7, carry out crosslinked.Then, be cooled to be higher than the temperature of 115 ℃ of softening points for expansion in dilatation mold, but be lower than 150 ℃, subsequently, in cooling cylinder 11, be cooled to be lower than about 60 ℃.
Though the embodiment that illustrates is a vertical-type, yet device of the present invention also can be made horizontal type, and wherein, pipe is by the extruding of level and towing.
From top description, we can know that device of the present invention can be produced heat-shrinkable tubing continuously reposefully by crosslinkable resin, can not run into hell and high water when tubing draws.Therefore be suitable for most producing continuously the heat-shrinkable tubing of certain-length, owing to do not need the desired metal lining of early stage technique device, wherein resin tubing is extruded and is coated on the tubular metal liner, so device of the present invention can be produced this tubing effectively with low cost, and can produce heat-shrinkable crosslinked resin tubing effectively to produce scale by batch.
Claims (9)
1, a kind of device that is used for producing continuously heat-shrinkable crosslinked resin tubing comprises
A combination extruder head that comprises mould and core rod is to be squeezed into hollow pipe to crosslinked resin; Be fitted together with above-mentioned extrusion head, be used for fluid is introduced device in the tubing that is pushed by above-mentioned extrusion head under pressure; The crosslinked tube that makes the tubular resin mixture crosslinked of being used to that is positioned at above-mentioned extrusion head downstream part; A dilatation mold that is positioned at above-mentioned crosslinked tube downstream part is used to guide tubing from wherein passing through, and along the inner surface that has continuous expansion on its downstream direction; A cooling cylinder that is used to cool off tubing that is positioned at above-mentioned dilatation mold downstream part; Be positioned at the guiding device that tubular material is become flat of above-mentioned cooling cylinder downstream part; What be positioned at above-mentioned guiding device downstream is used to draw the device that tubing leaves above-mentioned extruder head; Wherein, the smooth inner surface that extends to above-mentioned cooling cylinder continuously from above-mentioned crosslinked tube does not have obvious gaps and step, it is characterized in that: above-mentioned guiding device comprises a nozzle that is positioned at above-mentioned cooling cylinder downstream part, be used for being centered around circumferentially the outer surface of the tubing that comes out from cooling cylinder, wherein, the initial rounded cross section inlet of said nozzle gradually becomes the outlet of elliptic cross-section, and said nozzle places near the above-mentioned cooling cylinder outlet and the inner edge girth in its exit that enters the mouth remains constant.
2, device according to claim 1 is characterized in that, above-mentioned fluid guiding device comprises a passage in core rod, and pressure fluid is from wherein passing through.
3, device according to claim 1, it is characterized in that, it comprises also and being arranged in near the device in the above-mentioned crosslinked tube inlet near zone outlet of above-mentioned extruder head that it is used for anti-friction agent is delivered to the outer surface of pipe, so that it leaves above-mentioned extruder head smoothly.
4, device according to claim 1 is characterized in that, above-mentioned crosslinked tube has one to use the lining that has the material of high detachment and low-friction coefficient to make to resin on the surface within it.
5, device according to claim 1 is characterized in that, guiding device comprises a pair of roller, is used for rotating on one side under the pressure contact on one side from both sides pipe being pressed from both sides into flat.
6, device according to claim 1 is characterized in that, it so that comprise near the temperature control equipment that is positioned at the dilatation mold inlet, be used for making pipe to be higher than being lower than the resin compound crosslinking temperature under the temperature of softening temperature and pass through.
7, device according to claim 1, it is characterized in that, have one group of combination at least from extrusion head mould and crosslinked tube, the combination of crosslinked tube and dilatation mold, the device of selecting in the combination of dilatation mold and cooling cylinder is connected by an insulator that is used to block heat transmission therebetween.
8, device according to claim 1, it is characterized in that, have one group of combination from extrusion head mould and crosslinked tube at least, crosslinked tube and extension module have combination, and the device of selecting in the combination of dilatation mold and cooling cylinder is by being connected in order to the device of forcing to cool off the pipe that passes through in it.
9, device according to claim 1 is characterized in that, it further comprises the device that is used for bonding agent is sprayed onto the inner surface of pipe that is positioned at crosslinked tube or dilatation mold inside.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN87104754A CN1015971B (en) | 1987-07-11 | 1987-07-11 | Apparatus for continuously producing heat-shrinkable cress linked resin tub |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN87104754A CN1015971B (en) | 1987-07-11 | 1987-07-11 | Apparatus for continuously producing heat-shrinkable cress linked resin tub |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1030544A CN1030544A (en) | 1989-01-25 |
| CN1015971B true CN1015971B (en) | 1992-03-25 |
Family
ID=4814996
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN87104754A Expired CN1015971B (en) | 1987-07-11 | 1987-07-11 | Apparatus for continuously producing heat-shrinkable cress linked resin tub |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1015971B (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20040084614A (en) * | 2003-03-29 | 2004-10-06 | 엘지전선 주식회사 | Expansion tube of slit type heat shrinkable tube |
| US7500842B2 (en) * | 2004-06-10 | 2009-03-10 | Pla Giken Co., Ltd. | Catheter molding apparatus |
| CN100509334C (en) * | 2006-03-15 | 2009-07-08 | 赵成刚 | Thermal-shrinkage tube expanding mould |
| WO2008044310A1 (en) * | 2006-10-13 | 2008-04-17 | Sumitomo Electric Fine Polymer, Inc. | Heating apparatus for heat shrinkable tube |
| CN102019681A (en) * | 2009-09-17 | 2011-04-20 | 上海公元建材发展有限公司 | Large-diameter PE straight-wall pipe startup molding and towing device and startup method thereof |
| WO2016198477A1 (en) * | 2015-06-08 | 2016-12-15 | Windmöller & Hölscher Kg | Device and method for cooling a blown film |
| CN105085987B (en) * | 2015-09-18 | 2016-08-31 | 佟子豪 | The preparation method of covering property granule |
| CN109016480B (en) * | 2018-10-08 | 2023-09-15 | 上海长园电子材料有限公司 | Replaceable forming die and solder sleeve forming equipment and method |
| CN112895506B (en) * | 2021-01-15 | 2021-11-12 | 江南大学 | Production method of large-caliber engineering pipeline |
-
1987
- 1987-07-11 CN CN87104754A patent/CN1015971B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| CN1030544A (en) | 1989-01-25 |
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