CN104129062A - Detecting nitrogen blow event during polymerization process - Google Patents

Abstract

Processes and systems for detection of a nitrogen blow event during a polymer production process, such as a nylon 6,6 polymer production process, are disclosed and described. Processes and systems for arresting a nitrogen blow event during a polymer production process, such as nylon 6,6 polymer production processes, are also disclosed and described.

Description

Nitrogen during detection polymerization technique blows event

Technical field

The present invention relates to for utilizing acoustic information to detect and stoping the nitrogen during polymer casting process to blow the system and method for event.

Background technology

In the production technology of nylon polymer, based on autoclave pressure curve, the nylon polymer of melting is shifted out from autoclave, then push by template.After extruding, the nylon polymer of melting is quenched in cold water, and thinly slice or graininess.By maintaining the pressure curve for pushing with the nitrogen compressing in autoclave.Typical autoclave pressure is 3 to 9barA.

If allow nitrogen to leak by template in casting latter stage (being production process), or in the larger gap of mobile favorite outer appearance of the nylon polymer of melting, will there is so nitrogen and blow event.If allow this event not to be examined for a long time, it may be less desirable and also not dangerous so.Therefore,, for stopping fast or preventing nitrogen to blow, should close rapidly autoclave squeezing valve.

Traditionally, can on casting streamline, arrange an operator, the production technology of monitoring nylon polymer.When aware nitrogen blow open begin time, this operator immediately starting switch to close autoclave squeezing valve.While just beginning in order to blow at nitrogen, react fast, this operator in observation process must not because of other anything disturbed.Thus, just to reaching the object of production process monitoring and timely operate high pressure still squeezing valve, higher time and human cost have just been dropped into.

In addition,, even if keep absorbed state in observation process, operator is closing in time autoclave squeezing valve, preventing or reduce aspect generation that nitrogen blows event to greatest extent, also less successful.This be because with reaction time of operator Comparatively speaking the nitrogen event of blowing come sooner.

Summary of the invention

The problem that the present invention relates to the relevant method of polymers manufacturing and wherein exist.In one aspect, the present invention includes the method for blowing event for detection of nitrogen in polymer fabrication processes, this manufacturing process is for example nylon or nylon 6,6 polymer fabrication processes.In certain embodiments, the method generally includes: 1) use microphone to receive by nitrogen by the acoustic information producing for the template of extrusion molten polymer; 2) convert described acoustic information to electronic signal; And 3) use logic controller to blow event assessment electronic signal with the frequency of at least every 0.1 second 1 time for nitrogen.

In addition, also disclose in a kind of polymer fabrication processes and stoped nitrogen to blow the method for event.In some aspects, the method can comprise by such nitrogen that detects as herein described and blows event; And automatically close in response to the detection that nitrogen blows event the autoclave squeezing valve that nitrogen passes through.

Similarly, also disclose some nitrogen and blown the embodiment of detection system.One exemplary embodiment of described system can comprise: 1) microphone, and it is configured to detect by nitrogen by the acoustic information producing for the template of extrusion molten polymer; 2) modular converter, itself and described microphone electric coupling, and be configured to receive acoustic information and convert described acoustic information to electronic signal from described microphone; And 3) logic controller, itself and described modular converter electric coupling, and be configured to blow event assessment electronic signal with the frequency of every 0.1 second 1 time for nitrogen.

A kind of embodiment that blows prevention system for the nitrogen that stops the nitrogen occurring in polymer production technique to blow event is also disclosed herein.In one aspect, this system can comprise that the component set assembling like that as described herein and configure blows event to detect nitrogen, and also comprises a kind of setting, the autoclave squeezing valve electric coupling that the logic controller of wherein said system and nitrogen pass through.In this arranges, logic controller can be configured to when detecting that instruction nitrogen sends the signal of automatically closing autoclave squeezing valve while blowing the electronic signal of generation.

In addition the invention discloses, the embodiment of the method for the end for identifying nylon polymer casting event.This event can comprise: according to the end of the parameter prediction casting event of described event; And detect the nitrogen occurring during casting and blow event.In this case, nitrogen blows the end of the detection confirmation casting event of event.

Propose in other embodiments to finish the method for nylon polymer casting event.In one embodiment, the method can comprise: 1) according to the end of the parameter prediction casting event of described event; 2) detect like that as described herein nitrogen and blow event; And 3) the autoclave squeezing valve with template coupling is closed in the detection of blowing event in response to nitrogen.

Brief description of the drawings

Fig. 1 is that the nitrogen that is configured for according to an embodiment of the invention detecting during polymer production technique blows the equipment of system and the schematic diagram of logical block of event;

Fig. 2 be according to embodiments of the invention in order to improve the partial sectional view of embodiment of directionality acoustic assembly of direction and sensitivity of microphone, wherein this microphone in order to obtain acoustic information from polymer production technique;

Fig. 3 is the side view of the assembly of Fig. 2, and its exterior insulation shell is in retracted position;

Fig. 4 is the side view of the assembly of Fig. 3, and its exterior insulation shell is in forward location;

Fig. 5 is the diagram of the acoustic information that obtains during the typical nitrogen relevant with autoclave blows event;

Fig. 6 is the diagram of the acoustic information that obtains in the system arranging from Fig. 5 autoclave, and the nitrogen that wherein this acoustic information is occurred by the autoclave closing on blows event and produces; And

Fig. 7 is the schematic diagram that the nitrogen in order to describe the example according to the present invention blows event, threshold switch event and microphone level value.

It should be noted in the discussion above that these figure are only the examples of several embodiments of the present invention, therefore it is not in order to limit the scope of the invention.

Detailed description of the invention

Although following detailed description has comprised many details for illustrating, those of ordinary skill in the art can understand many variations to details below and replace all in the scope of embodiment disclosed herein.

Therefore, the following examples are set forth in the situation that without loss of generality and not any claimed invention being limited.Before describing the present invention in more detail, it will be appreciated that, the disclosure is not limited to specific embodiment as described herein, because this can change.Also should understand term used herein is only in order to describe specific embodiment, instead of restriction, because scope of the present invention is only defined by the following claims.Unless otherwise defined, all technology used herein and scientific terminology have the those of ordinary skill meaning of understanding conventionally of the affiliated technical field of the disclosure.

With in description and claims, use the same, unless explicitly pointed out in literary composition, represent that the word of odd number meaning also has plural meaning simultaneously.Therefore, such as, in the time mentioning " microphone ", the meaning also can refer to multiple microphones, " autoclave " also represents multiple autoclaves.

In the present invention, " comprising ", " containing " and " having " etc. can have gives their implication and can represent " comprising " etc. in united states patent law, and ordinary solution is interpreted as open-ended term.Term " by ... composition " be closed term, and only include according to the device of specifically listing in united states patent law, method, component, parts, member, step etc." mainly by ... composition " etc., in the time of the device comprising for the present invention, method, component, assembly, structure, step etc., refers to disclosed element in literary composition, and it can contain additional structure group, component, assembly, method step etc.But additional device, method, component, assembly, structure, step etc. are compared with corresponding device disclosed herein, component, method etc., the essential characteristic to device, component, method etc. and new feature do not produce materially affect.

Furthermore, " mainly by ... composition " and other similar terms in the time of other analogs that comprise for equipment, method, composition, parts, structure, step or the present invention, its implication is identical with the implication specifying in united states patent law.And this term is open, it allows to occur comparing the more content of recorded content (but except embodiment of prior art), and prerequisite is that the basic or new feature of recording can be because of occurred not changing more than recorded content.When using open term during as " comprising ", need to understand that the statement of " substantially by ... composition " and " by ... composition " also should directly be supported, as clear and definite statement.

As described herein, " nitrogen blows " and " nitrogen blows event " refer to nitrogen from for extrusion molten polymer as the phenomenon that blows out or emit in the template of nylon 6,6 polymer.Nitrogen usually blows the final stage that (not always) can show or indicate the casting event of producing polymer.Equally, be noted that term " nitrogen blows " also comprises the contingent event that blows out causing due to nitrogen and/or other gas that may occur.Therefore, nitrogen blows and can be caused by the space in the polymer of melting in some instances, and this space is generally nitrogen, but also can comprise or can be steam or degraded gas.Therefore, for the equipment of this example that will realize, this gas is that nitrogen is unessential, and term " nitrogen blows " generally includes contingent nitrogen and/or other gas blows out event.

As described herein, " acoustic information " and other similar terms refer to the acoustic properties of sound, as pitch, frequency and volume (namely pressure or level).These attributes comprise that its measurement is all known.

The commutative in the text use of term " equipment " and " system ".

Should be noted, ratio, concentration, quantity and other data may have certain scope.What also need understanding is, scope of application form is convenient in order to express, succinct, therefore it should be interpreted as not only comprising herein the clearly scope limits value of narration flexibly, also comprise other all single numerical value or subintervals in scope, just as each numerical value and subinterval comprise from " approximately ' X ' is to about ' Y ' ".In order to be further illustrated, the concentration range meaning of " about 0.1% to 5% " is not only to comprise the concentration that is approximately 0.1wt% or 5wt% explicitly pointing out, and also comprises other single concentration (as 1%, 2%, 3% and 4%) and subinterval (as 0.5%, 1.1%, 2.2%, 3.3% and 4.4%) in this specified scope.In instantiation, according to the significant digits of numerical value, the numeral with term " about " can comprise traditional making up a round number.In addition, " approximately from X to Y " comprises " approximately ' X ' is to about ' Y ' ".

" approximately " used herein permissible level or scope in the time representing numerical value or scope has variation to a certain degree, as described in fixed value or scope in as described in boundary value 10% in or 5% in.

In addition, if when feature of the present disclosure or aspect being described according to list or Ma Kushi group, those skilled in the art also will recognize that the present invention thus or are described according to the subgroup member of individual member or Ma Kushi group.Such as, if X is described as being selected from the group being made up of bromine, chlorine and iodine, the claim that is bromine for X so and the claim that is bromine and chlorine for X be described as completely just look like they be list separately like that.For example, in the situation that feature in the present invention or aspect are described with tabular form, it will be recognized by those skilled in the art that the present invention also can describe according to the individual member of list or Ma Kushi group or any combination of subgroup member.Therefore, if X is described as being selected from the group that comprises bromine, chlorine and iodine, Y is described as being selected from the group that comprises methyl, ethyl and propyl group, is that bromine and Y are that the description of the claim of methyl is fully and is supported so for X.

Be significantly, in the situation that not deviating from scope of the present invention or spirit, those skilled in the art read have in will be appreciated that described herein and illustrated each embodiment after the present invention can easily separate or with other several embodiment in discrete component and the feature of any one Feature Combination.The method of any record can be carried out with the order of the event recorded or with possible in logic any other order.

Embodiments of the invention combine the polymer production technique of for example nylon 6,6, so that higher automaticity to be provided, and significantly reduce or eliminate the needs of operator being assisted for operation process.Therefore, by eliminating or at least reducing near the time that operator stops production equipment, can bring many advantages, comprise cost-saving, raise the efficiency, improve security etc.

Below with reference to Fig. 1, show in nylon polymer production technology for detection of and/or stoped nitrogen to blow the schematic diagram of the embodiment of the system 10 of event.Herein by example to nylon, more particularly the polymerization process of nylon 6,6 is discussed.Be appreciated that, in the time that nylon polymerization is discussed, the convergence principle of describing in literary composition not only with nylon 6,6 is relevant, also relevant with other nylon polymers, polyamide polymer, even relevant to other polymer that do not relate to nylon, just as described completely for any any concrete polymer interested that air-blowing phenomenon occurs to push and produce.Therefore, in process of production, material is melt into nylon polymer by autoclave 20.In example, autoclave comprises agitator or auger 25, but also can similarly use the autoclave that there is no agitator or auger.On specified point in this technique, autoclave pressurizes with nitrogen, and autoclave squeezing valve 30 opens to allow the nylon of melting from autoclave, to flow out under the pressure of nitrogen.Flow through after autoclave squeezing valve, the nylon of melting continues to be pushed by this system, until arrive extrusion die plate 40, here melted nylon is extruded (i.e. casting) one-tenth wire or sheet by template, quenches afterwards and cut into thin slice or particle in cooling water.

Along with autoclave is emptying and provide to the molten polymer of template and start to exhaust, thereby the point that there will be the pressure of nitrogen in system to exceed residue melted nylon polymer causes nitrogen to blow out from template.This event can be the strong release with remarkable strength, and can cause the melted nylon polymer of droplets splash uncontrollably or be injected in template environment around.Just as mentioned previously, this event be harmful to and also even the operating personnel in region are nearby caused to danger.It also causes needs cleaning equipment to comprise equipment obvious confusion around.

Due to the sound producing, therefore can know that nitrogen blows event and when starts in the time that nitrogen starts to leave template.Refer again to Fig. 1, microphone 50 is shown as the acoustic information being produced by template 40 by nitrogen for receiving.This microphone can be the microphone that can fully receive arbitrarily desired acoustic information.

In one embodiment, microphone 50 can be Electret Condencer Microphone.This microphone is known, for example, have the Brual of 50mV/Pa sensitivity and the microphone of Kjaer class 4189 types.Also can select the microphone of other types.Typical capacitance microphone comprises metal-back and the metal film as measurement mechanism.Under film, it is base plate.Acoustic information such as sound wave will receive and make metal film vibrations by microphone.These vibrations change distance between film and base plate.Film and base plate be combined to form capacitor.The vibrations of film have caused the dielectric value changing between film and base plate.The variation of dielectric value shows as the variation of condenser capacitance.Therefore the acoustic information, entering and attribute thereof can be used as the function of the capacitance changing in capacitor and are measured.2 to 60pF(but this electric capacity depends on the diameter of film, in certain embodiments, this diameter can be, micromicrofarad) in scope.

Modular converter 65 and microphone 50 electric coupling, and be configured to receive acoustic information and convert thereof into electronic signal from microphone.Modular converter can comprise preamplifier 60 and sound level watch-dog 70.In the example shown in Fig. 1, preamplifier is integrated in microphone, and sound level watch-dog is expressed as separate modular.Described here is for an illustrative examples that may arrange.Having will be understood that after having considered the present invention, also can adopt other settings as those skilled in the art.Therefore, in certain embodiments, preamplifier can be the integrated unit with microphone.Preamplifier is conventionally in order to change or to be varied to low impedance value by the acoustic information receiving from microphone or signal from high impedance value.Such as, the resistance value of Electret Condencer Microphone can be about 1G ohm, and preamplifier can be reduced to this value about 50 ohm or less.The example of this preamplifier is Brual and Kjaer class 2671 types.B & K microphone preamplifier class 2671 types have the sensitivity of 1mV/mV.Real output signal is constant 12V DC voltage, and wherein, microphone signal is added on this 12V DC voltage.

As mentioned above, sound level watch-dog 70 can be a part for modular converter 65, and can with preamplifier 60 electric coupling.In some specific embodiments, these two kinds of devices can pass through coaxial cable electric coupling.Sound level watch-dog can be carried out at least three kinds of basic operations to the signal receiving from preamplifier.First, sound level watch-dog filters the signal receiving.Research finds that nitrogen blows frequency that the sound of generation mainly has between 15-40kHz.Therefore, in one aspect, sound level watch-dog can be configured to filter out have to be in and represent that nitrogen is by all acoustic information substantially of the frequency outside the frequency range of template 40.In one embodiment, sound level watch-dog can filter out and be in about 15kHz to all outside the frequency range of about 40kHz or all frequency substantially.

Except filtering, sound level watch-dog 70 also can be configured to carry out the function of linearizing signal.This function can by use logarithm in sound level watch-dog for example all the assembly (not shown) of side's (LMS) detector complete.Also can use mechanism or assembly that other can linearizing signal.In addition, sound level watch-dog also can be configured to before signal output its standardization.In certain aspects, this signal can be standardized into 4-20mA standard signal.

Still with reference to figure 1, logic controller 90 shown in figure and modular converter 65 electric coupling, its in certain embodiments also can be directly and sound level watch-dog 70 be coupled.Logic controller is configured to the electronic signal of assessment from modular converter.In certain embodiments, logic controller also can or be communicated by letter with it with 30 electric coupling of autoclave squeezing valve (directly or indirectly).When perceive from converter unit show that nitrogen blows the signal that may start of event time, logic controller signals autoclave squeezing valve and closes.Closing of autoclave squeezing valve blocked the path of nitrogen arrival template 40 and therefore stopped or having stoped nitrogen to blow event, or at least whole nitrogen blows event.

Consider the speed (conventionally in 1s or faster) that the nitrogen event of blowing occurs, advantageously adopt logic controller 90 with high-frequency judgement, sampling, reception or perception the signal from modular converter 65, so that autoclave squeezing valve shutdown signal or order can be sent to autoclave squeezing valve or be received by it, and are closed in time to reduce, stop or minimize nitrogen and blow event.In some respects, logic controller can at least every 0.1 second (, 1/10th seconds) frequency (being interval) once be assessed the signal from modular converter.On the other hand, this frequency or interval can be between every 0.1 seconds and every 0.001 second.On the other hand, this frequency or interval can be between every 0.08 seconds and every 0.02 second.On the other hand, this frequency or interval can be approximately every 0.04 second 1 time.

Nylon polymer casting or manufacturing process are controlled by process control system or unit (established technology controller) 80.The basic operation of this unit or system control autoclave 20 and other technique components.An example of this unit or system is the TDC3000DCS being manufactured by Honeyville.In some instances, process control system can all or part ofly comprise or integrated nitrogen of the present invention blows detection system.In other configurations, nitrogen blows detection system and can separate with process control system.

Comprise or integrated nitrogen blows in the example of detection system at process control system 80, logic controller 90 can be controlled autoclave squeezing valve 30 or be communicated with (sending signal to it) by process control system.But in other examples, logic controller can directly be controlled autoclave squeezing valve or communicate with.

As shown in Figure 1, in certain embodiments, technology controlling and process unit 80 also can with modular converter 65 electric coupling, as shown in the figure, and be further coupled with sound level watch-dog 70 as shown.But, even this example, thus process control system or unit conventionally not can or can not with close fully in time autoclave squeezing valve with the interval that stops satisfactorily or best nitrogen to blow (be mostly just approximately once per second) evaluate, processing, perception or monitoring be from the signal of sound level watch-dog.But after being coupled with modular converter, process controller can be used as the standby of logic controller 90 or supplements.Like this, if logic controller lost efficacy, technology controlling and process unit still can be closed autoclave squeezing valve when needed.Can more in the embodiment of high-speed traffic, can not use logic controller with modular converter in technology controlling and process unit.

In the time that autoclave squeezing valve 30 cuts out, the nitrogen event of blowing is stoped or is suppressed.Consider speed and the efficiency of current system, the autoclave squeezing valve that nitrogen passes through can start from the nitrogen event of blowing less than 1 second in automatically close.In certain aspects, closing of autoclave squeezing valve occurs in 0.1 to 0.6 second that starts from the nitrogen event of blowing.In aspect other, this valve cuts out in about 0.54 second or shorter time.Can close squeezing valve by using such as the electromechanical assembly 95 of helix tube or other similar installations, these devices are suitable for receiving the signal from logic controller, and close high-pressure extrusion valve after the signal of closing autoclave squeezing valve receiving from logic controller.

With reference now to Fig. 2-4,, shown in figure is directionality acoustic assembly 100 according to an aspect of the present invention.In certain embodiments, microphone can be that direction is sensitive, to concentrate better the sound of self-template.In order further to increase or improve the directionality of microphone, and further suppress or eliminate the sound from surrounding environment, as near the sound of the autoclave operation of other batches from, can use the assembly shown in Fig. 2.

As shown in the figure, microphone 50 is arranged at and is configured to sound guidance to first party tropism's shell 140 of microphone.First party tropism's shell shown in figure be shaped as tubulose.But some shapes that other can strengthen or be conducive to the directionality receiving by the sound of microphone are all suitable for.First party tropism's shell can use and be applicable to widely durable material, such as the plastic material comprising such as PVC.On the one hand, can according to its price whether cheap come selection material.In addition, also can carry out selection material according to its specific sound inhibitory property.

Shell 110 and sound insulating barrier 120 are selectively included in assembly 100.When use, directionality acoustic assembly be arranged near template and opening towards template.For ease of locating this assembly, can use support bar 130.Support bar can be coupled with first party tropism shell 140, and extends inward and pass assembly, and sound insulation layer and shell are depended on thereon.Further as shown in Figures 3 and 4, shell and/or sound insulation layer can be retracted in the time need to solving any problem of assembly, such as the placement in order to facilitate microphone 50 with remove.

Below with reference to shown in Fig. 5 and 6, figure for using the diagrammatic representation of the signal that microphone disclosed by the invention and assembly record.Fig. 5 provides the sound level level of blowing event from the typical nitrogen of nylon production system, and this nylon production system has been assembled according to microphone of the present invention.Figure 6 shows that the sound level that the adjacent system nitrogen event of blowing obtains while generation.Can find out, the sound level that adjacent system records is obviously different, and therefore System and method for described herein can be distinguished these curves by programming.Like this, multiple system can be used with closing on also together with the autoclave of work.

It should be noted native system assembly and module be connected and line should careful carrying out, to ensure to reduce or prevent the possibility of the interference of any illusory positive signal or other signals.In an example, microphone can be only on one side of the line from microphone to controller, particularly one side ground connection of the line between microphone and sound level watch-dog.Such ground connection configuration can reduce the generation of false positive signal.

In some instances, the nitrogen event of blowing may be unforeseen.In other examples, when the nitrogen event of blowing can expectability betides nylon polymer batch machining or casting (producing) event and will finish.In a rear situation, can blow detection system and method with nitrogen of the present invention and carry out the end of explicit recognition casting or processing event, blow event itself thereby finish nitrogen.In this example, the parameter of event is monitored, and this parameter is monitored by process control system 80 in some instances.In the time that event proceeds to its later stage and terminal stage, can use nitrogen to blow the detection of beginning open with the end of explicit recognition batch machining, thereby and can stop with the detection that nitrogen blows the beginning open in some instances the function End Event of process equipment.

In order further to improve the accuracy detecting and mistake to be minimized, particularly blowing detection system with nitrogen while showing that batch machining or casting event finish, very helpful according to monitoring environment and watch-dog correct detection system.Once microphone is suitably arranged near autoclave and other equipment and after template, starts to gather initial voice reading and collection information.Can set warning limit value according to these initial readings.Or, can set warning limit value according to the general understanding to casting process before or to the understanding of specific casting equipment.In one aspect, conventionally warn that limit value is about 90db or higher sound level.

Example

For provide to those of ordinary skill in the art meet nitrogen of the present invention described herein blow event detection and/or stop technique, provide example below.Particular step given here, device, material or numerical value are exemplary, are not construed as limiting the invention.

Blow event detection and/or stop the embodiment of sequence of events of system as follows for operating disclosed nitrogen:

Starting before casting, the Gao-Gao of microphone signal (HH) and high (H) warning limit value in process for emptying control system.This can prevent that nitrogen from blowing detection system and activating (can carry out shut off valve with air equally, conventionally discharge this air for opening valve) because air flows out squeezing valve.

Process control system is forbidden to the nitrogen of logic controller and is blown detection activation signal.Therefore, logic controller can not be got involved squeezing valve.

Sometimes after casting event starts, processing controller writes HH warning limit value (for example 92 decibels) and H warning limit value (for example 90 decibels) to microphone signal data storehouse point.

In the latter stage of casting event, nitrogen discharges by template and is emitted in for example, sound in particular frequency range (, 15kHz to 40kHz).

Measure the intensity of sound and use electronic signal (for example, analog signal) to processing controller and the logic controller measured intensity of report continuously.The scope of the corresponding 34dB to 94dB of this signal.

In processing controller, microphone signal is arranged so that squeezing valve is closed or is interlocked in the time that measured sound level exceeds HH value.

In last a few minutes of casting, if microphone signal exceedes H value, logic controller or processing controller or the two also can be closed squeezing valve together.

Fig. 7 has shown the exemplary plot with the real time data of drawing based on sound level.In this example, nitrogen blows and detects limit value and can be set to the sound higher than casting equipment normal operating, but blows before event or nitrogen blows sound level level that experience or that produce during event lower than nitrogen.In addition, as described herein, microphone and sound device can be configured to the frequency that can filter outside 15kHz to 40kHz scope, and this scope is to represent that nitrogen blows the typical frequency range that event occurs.Shown in particular example in, before nitrogen blows event, squeezing valve part is closed, as shown in the figure.This process is typical for autoclave nylon technique.For example, exchange moisture content because top layer has the gaseous environment of larger chance and top conventionally, therefore the top layer of the molten polymer in autoclave and the remainder of polymer are compared and may be had very different attributes.Therefore, the viscosity of leaving the polymer of template is compared from the viscosity of other parts of polymer may be very different, and this makes in last 1-2 minute of casting, to have abnormal high throughput.In order to prevent the problem relevant to the high throughput of this burst, this valve can partly cut out to reduce throughput.This early part is closed and is also contributed to detect in early days when nitrogen blows event more quick closedown squeezing valve.Therefore,, in lower valve position, in valve actuator, there is less air to want emptying with shut off valve.The real response of as shown in Figure 7, the nitrogen detecting being blown is shown as after the less horizontal component of the figure relevant to squeezing valve curve of output.

Although to describe the present invention specific to the language of architectural feature and/or operation,, in claim, theme required for protection is not limited to above-mentioned special characteristic and operation.On the contrary, above-mentioned disclosed special characteristic is the example form that realizes claim with operation.Not departing under the prerequisite of the disclosed spirit and scope of the present invention, can design the setting of multiple amendment and replacement.

Claims (42)

1. a method of blowing event for detection of the nitrogen in polymer fabrication processes, comprising:

Use microphone to receive by nitrogen by the acoustic information producing for the template of extrusion molten polymer;

Convert described acoustic information to electronic signal; And

Use logic controller to assess described electronic signal with the frequency of at least every 0.1 second 1 time for the nitrogen event of blowing.

2. method according to claim 1, wherein, is used microphone to receive described acoustic information and comprises the voice attribute of measurement as the function of the capacitance of the variation in capacitor.

3. method according to claim 2, wherein, the scope of described capacitance at about 2 pico farads between about 60 pico farads.

4. method according to claim 1, wherein, changes described acoustic information and comprises that use preamplifier is converted to low impedance value by described acoustic information from high impedance value.

5. method according to claim 4, wherein, described high impedance value is about 1G ohm, described low impedance value is about 50 ohm or still less.

6. method according to claim 1, wherein, changes described acoustic information and comprises that the filtering of use sound level watch-dog is any in representing that nitrogen is by the frequency outside the frequency range of template.

7. method according to claim 6, wherein, described expression nitrogen is from about 15kHz to about 40kHz by the frequency range of template.

8. method according to claim 1, wherein, change described acoustic information comprise with logarithm all square detector carry out signal described in linearisation.

9. method according to claim 8, wherein, described method further comprises the 4-20mA signal that linearizing signal standards is changed into standard.

10. method according to claim 1, wherein, the frequency of described logic controller assessment signal is between every 0.1 second 1 time to every 0.001 second 1 time.

11. methods according to claim 10, wherein, the frequency of described logic controller assessment signal is between every 0.08 second 1 time to every 0.02 second 1 time.

12. methods according to claim 11, wherein, the frequency of described logic controller assessment signal is approximately every 0.04 second 1 time.

13. methods according to claim 1, wherein, the interruption of the polymer flow that the described nitrogen event of blowing is caused by the space in the polymer of melting causes.

14. methods according to claim 1, wherein, described nitrogen blows the end of representations of events polymer casting event.

15. methods according to claim 1, wherein, described polymer is nylon 6,6 polymer.

16. 1 kinds for stoping the nitrogen of polymer fabrication processes to blow the method for event, comprising:

As claimed in claim 1ly detect described nitrogen and blow event like that; And

Blow the detection of event in response to described nitrogen, automatically close the autoclave squeezing valve that nitrogen passes through.

17. methods according to claim 16, wherein, after the closing of described autoclave squeezing valve occurs in the described nitrogen event of blowing and starts less than in 1 second.

18. methods according to claim 16, wherein, between 0.1 second to 0.6 second after the closing of described autoclave squeezing valve occurs in the described nitrogen event of blowing and start.

19. methods according to claim 16, wherein, in after the closing of described autoclave squeezing valve occurs in the described nitrogen event of blowing and start 0.54 second or shorter time.

20. methods according to claim 16, wherein, described autoclave squeezing valve part before automatically closing step is closed.

21. methods according to claim 16, wherein, described logic controller and the electric coupling of autoclave squeezing valve, and when determining while occurring that nitrogen blows event that transmitted signal is to close described valve.

22. methods according to claim 21, wherein, described logic controller is electrically coupled on autoclave squeezing valve by the process control system of controlling polymer fabrication processes operation.

23. method according to claim 16, wherein, described polymer is nylon polymer.

24. methods according to claim 23, wherein, described nylon polymer is nylon 6,6 polymer.

25. 1 kinds of nitrogen that blow event for detection of the nitrogen relevant to polymer fabrication processes blow detection system, comprising:

Microphone, it is configured to detect by nitrogen by the acoustic information producing for the template of extrusion molten polymer;

Modular converter, itself and described microphone electric coupling, and be configured to receive acoustic information and convert described acoustic information to electronic signal from described microphone; And

Logic controller, itself and described modular converter electric coupling, and be configured to assess described electronic signal with the frequency of at least every 0.1 second 1 time for the nitrogen event of blowing.

26. systems according to claim 25, wherein, described modular converter further comprises:

Preamplifier, itself and described microphone electric coupling, and be configured to receive acoustic information and described acoustic information is converted to low impedance value from high impedance value from described microphone; And

Sound level watch-dog, itself and described preamplifier are coupled, and are configured to receive acoustic information from described preamplifier, and filtering is any in representing that nitrogen is by the frequency outside the frequency range of template.

27. systems according to claim 26, wherein, described sound level watch-dog is further configured to and uses all described signals of square detector linearityization of logarithm.

28. systems according to claim 27, wherein, described sound level watch-dog is further configured to the 4-20mA signal that linearizing signal standards is changed into standard.

29. systems according to claim 25, wherein, described microphone is orientation-sensitive.

30. systems according to claim 29, wherein, described system also comprises the shell with described microphone coupling, described shell is provided with opening and to strengthen described microphone, the directionality of sound is received.

31. systems according to claim 30, wherein, described shell is roughly tubulose, and described microphone resides in this tubulose shell.

32. systems according to claim 30, wherein, described shell insulate, further to suppress except by being configured to allow sound to enter the sound the sound that the opening in shell receives.

33. systems according to claim 30, wherein, the opening of described shell is towards described template.

34. systems according to claim 29, wherein, described microphone is measured the acoustic information of reception as the function of the capacitance of the variation in capacitor.

35. systems according to claim 29, wherein, described microphone is ground connection in a side of the cabling between microphone and controller only, to reduce the generation of wrong positive signal.

36. systems according to claim 25, wherein, described polymer is nylon 6,6 polymer.

37. 1 kinds are blown prevention system for the nitrogen that stops nitrogen that polymer fabrication processes occurs to blow event, comprising:

By the such component set of assembling and configuring described in claim 25, wherein said logic controller is electrically coupled to the autoclave squeezing valve that nitrogen passes through, and is configured to show that when detecting nitrogen sends the signal of automatically closing autoclave squeezing valve while blowing the electronic signal of generation.

38. according to the system described in claim 37, and wherein, described system further comprises electromechanical assembly, and it is suitable for receiving signal from described logic controller, and closing autoclave squeezing valve in the time that described logic controller receives the signal of closing autoclave squeezing valve.

39. according to the system described in claim 37, and wherein, described polymer is nylon polymer.

40. according to the system described in claim 39, and wherein, described nylon polymer is nylon 6,6 polymer.

41. 1 kinds for identifying the method for end of nylon polymer casting event, comprising:

According to the end of the parameter expection casting event of described event; And

Blow event by such nitrogen that detects claimed in claim 1, wherein, described nitrogen blows the end of the detection confirmation casting event of event.

42. 1 kinds are finished the method for nylon polymer casting event, comprising:

According to the end of the parameter expection casting event of described event;

Blow event by such nitrogen that detects claimed in claim 1; And

Blow the detection of event in response to described nitrogen and close the autoclave squeezing valve being coupled with template.