CN202764180U - Screw assembly for extrusion processing of nylon without nylon drying process - Google Patents

Screw assembly for extrusion processing of nylon without nylon drying process Download PDF

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Publication number
CN202764180U
CN202764180U CN201220029958XU CN201220029958U CN202764180U CN 202764180 U CN202764180 U CN 202764180U CN 201220029958X U CN201220029958X U CN 201220029958XU CN 201220029958 U CN201220029958 U CN 201220029958U CN 202764180 U CN202764180 U CN 202764180U
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CN
China
Prior art keywords
nylon
screw
kneading member
screwing element
reverse
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn - After Issue
Application number
CN201220029958XU
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Chinese (zh)
Inventor
马建中
刘均科
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
TIANJIN GERUIDE NEW MATERIAL TECHNOLOGY Ltd
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TIANJIN GERUIDE NEW MATERIAL TECHNOLOGY Ltd
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Priority to CN201220029958XU priority Critical patent/CN202764180U/en
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Publication of CN202764180U publication Critical patent/CN202764180U/en
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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25Component parts, details or accessories; Auxiliary operations
    • B29C48/36Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/50Details of extruders
    • B29C48/505Screws
    • B29C48/575Screws provided with elements of a generally circular cross-section for shearing the melt, i.e. shear-ring elements
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25Component parts, details or accessories; Auxiliary operations
    • B29C48/36Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/50Details of extruders
    • B29C48/505Screws
    • B29C48/54Screws with additional forward-feeding elements
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25Component parts, details or accessories; Auxiliary operations
    • B29C48/36Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/50Details of extruders
    • B29C48/505Screws
    • B29C48/57Screws provided with kneading disc-like elements, e.g. with oval-shaped elements

Abstract

The utility model relates to a screw assembly for extrusion processing of nylon without a nylon drying process. An assembly with two screws with the same structure is arranged on an extruder; the screw comprises a spline shaft with splines, and threaded components and kneading components, wherein spline grooves corresponding to the splines on the spline shaft are form in inner holes of the threaded components and the kneading components; the length of the screw is 26,000 mm and the diameter of the screw is 65mm; a plurality of different threaded components and a plurality of different kneading components are sleeved on the spline shaft sequentially; and the two screws which are meshed with each other in the same direction have 90-degree phase angle during assembly. The screw assembly can sufficiently volatilize water contained in nylon during processing, so that the nylon (polyamide PA) drying process is omitted before processing, the nylon is not foamed and has good mechanical properties, energy sources are saved, and the production cost is reduced.

Description

Need not nylon is carried out the screw combinations of drying and processing for extrusion molding processing nylon
Technical field
The utility model relates to a kind of plastics extrusion molding process equipment, and particularly a kind of nylon (polyamide PA) is removed drying and processing from before processing, energy-conservation and cost is low is used for extrusion molding processing nylon and need not nylon is carried out the screw combinations of drying and processing.
Background technology
As everyone knows, nylon (polyamide PA) is a kind of macromolecular material, it is one of kind that consumption is maximum in the engineering plastics, nylon (polyamide PA) is very easy to suction and makes moist, during preservation generally all use the material packing that intercepts water, generally, nylon (polyamide PA) all need to reach 4-6 hour drying and processing under greater than 100 ℃ high temperature before injection moulding or extrusion molding processing, its water content is reduced to below 0.2%, otherwise will foam, have a strong impact on material mechanical performance.
Summary of the invention
The utility model provides a kind of nylon (polyamide PA) to remove drying and processing from before processing for solving the technical problem that exists in the known technology, the screw combinations that need not nylon is carried out drying and processing for extrusion molding processing nylon that energy-conservation and cost is low.
The technical scheme that the utility model is taked for the technical problem that exists in the solution known technology is: it comprises extruding machine, it is characterized in that: on the extruding machine with the identical screw combinations of two root architectures, screw rod comprises splined shaft, screwing element and kneading member, the endoporus of screwing element and kneading member is with the spline corresponding with the spline on the splined shaft, a plurality of different screwing elements are arranged in order with a plurality of different kneading members and are enclosed within on the splined shaft, and the screwing element and the kneading member that arrange are fixed in the two ends of splined shaft; Turning to of two screw rods is identical, during assembling, and 90 ° of phase angles of two screw rod phases phasic difference.
The utility model can also adopt following technical scheme:
The forward and reverse screwing element of described a plurality of difference is to represent with X/Y, X/YSK and X/YL, wherein X represents the helical pitch (unit is mm) of screwing element, Y represents the length (unit is mm) of screwing element, SK among the X/YSK refers to that the screw channel of screwing element is darker, tapering is arranged at the screw channel bottom, X/Y represents that screwing element is the forward screw thread among X/Y and the X/YSK, and X/YL represents that screwing element is reverse thread;
In the described a plurality of different forward and reverse screwing element that represents with X/Y X/Y, X/YSK and X/YL have various concrete data as:
72/72SK, 72/36SK, 72/72,64/64,56/56,44/44, in the reverse thread element that its X/YL represents 44/22L is arranged, m * X/Y or m * X/YL represent the several forward and reverse screwing element that specification is identical, such as 2 * 72/36 or 2 * 44/22L;
The described forward and reverse kneading member of a plurality of differences that represents with α/n/Z, α represents the error angle of kneading member, and n represents the number of kneading block, and Z represents the length of whole kneading member; α/n/Z represents the forward kneading member, and α/n/ZL represents reverse kneading member, and its concrete data are 45 0/ 5/56,60 0/ 4/44,45 0/ 5/72,90 0/ 5/56, oppositely kneading member is such as 45 0/ 5/56L, m * α/n/Z or m * α/n/ZL represent the several forward and reverse kneading member that specification is identical, such as 2 * 45 0/ 5/56 or 2 * 45 0/ 5/56L;
Described every screw rod is divided into: totally 5 sections of solid conveying section A, melt zone B, mixing section C, exhaust section D and homogenizing zone E, wherein
Solid conveying section A comprises following element:
56/56A?,72/72,?72/72SK?,?72/36SK,?64/64,?56/56,44/44,44/44,44/44;
Melt zone B element arrangements is as follows: 45 0/ 5/56,45 0/ 5/56,60 0/ 4/44,56/56,45 0/ 5/56,45 0/ 5/56,45 0/ 5/56L, 44/44,
90 0/5/56,44/22L;
Mixing section C element arrangements is as follows: 72/72,72/72,56/56,44/44,44/44,45 0/ 5/56,45 0/ 5/56,56/56,44/44,60 0/ 4/44,45 0/ 5/72,56/56,44/44,45 0/ 5/56,90 0/ 5/56,44/44,90 0/ 5/56,44/22L;
Exhaust section D element arrangements is as follows: 72/72,72/72;
Homogenizing (metering) section E element arrangements is as follows: 64/64,56/56,56/56,44/44,44/44,44/44.
Advantage and the good effect that the utlity model has are: because nylon (polyamide PA) extrusion molding is added man-hour, exempted the front oven dry link to nylon (polyamide PA) of processing, under this process conditions, nylon (polyamide PA) can not foam, good mechanical properties, this screw combinations are fully volatilized the moisture in the nylon (polyamide PA), keep the stable mechanical property of nylon, and energy savings, reduce production costs.
Description of drawings
Fig. 1 is the structural representation of screw rod integral body;
Fig. 2 is the structural representation of screwing element;
Fig. 3 is the structural representation of kneading member;
Fig. 4 is the structural representation of kneading and screwing element engagement.
Among Fig. 1-Fig. 4: 1. screw rod, 2. splined shaft, 3. screwing element, 4. kneading member,
5. spline, the A. solid conveying section, the B. melt zone, the C. mixing section, the D. exhaust section,
E. homogenizing zone.
The specific embodiment
For further understanding summary of the invention of the present utility model, Characteristic, hereby exemplify following examples, and cooperate accompanying drawing to be described in detail as follows:
Such as Fig. 1-shown in Figure 3: on the extruding machine with identical screw rod 1 combination of two root architectures, described screw rod 1 length is 2600mm, diameter is 65mm, screw rod 1 comprises splined shaft 2, screwing element 3 and kneading member 4, the endoporus of screwing element 3 and kneading member 4 is with the spline 5 corresponding with the spline on the splined shaft 2, screwing element 3 and kneading member 4 are arranged in order and are enclosed within on the splined shaft 2, turning to of two screw rods 1 is identical, as shown in Figure 4: during assembling, 90 ° of phase angles of two screw rod 1 phase phasic differences; Screwing element 3 is delivery element, kneading member 4 is shearing elements, the description of screwing element 3 is generally X/Y and X/YSK, and X represents the helical pitch (unit is mm) of screwing element 3, and Y represents the length (unit is mm) of screwing element 3, such as 72/72SK, the helical pitch that represents this screwing element 3 is 72mm, and length is 72mm, and the SK among the 72/72SK refers to that the screw channel of screwing element 3 is darker, tapering is arranged at the screw channel bottom, and 72/72 is common screwing element 3; The description of kneading member 4 is generally α/n/Z, and α represents the error angle of kneading member 4, and n represents the number of kneading block, and Z represents the length of whole kneading member 4; X/Y represents that screwing element 3 is the forward screw thread, and X/YL represents that screwing element 3 is reverse thread; α/n/Z represents forward kneading member 4, and α/n/ZL represents reverse kneading member 4; M * X/Y or m * α/n/Z represents several screwing elements 3 or the kneading member 4 that specification is identical;
Screw combinations is from screw rod 1 root to screw rod 1 head as shown in Figure 1: screwing element 3 and kneading member 4 are followed successively by (unit is mm) from top to bottom:
56/56A, 2 * 72/72SK, (SK refers to that the screw channel of screwing element 3 is darker, and certain tapering is arranged at the screw channel bottom, is convenient to carry high material of filling; Common screw element 3 screw channels bottom is smooth; ) 72/36SK, 64/64,64/64,56/56,44/44,44/44,44/44,45 0/ 5/56,45 0/ 5/56,60 0/ 4/44,
56/56,45 0/5/56,45 0/5/56,45 0/5/56L,44/44,90 0/5/56,44/22L,72/72,
72/72,,56/56,?44/44,?44/44,?45 0/5/56,45 0/5/56,?56/56,?44/44?,60 0/4/44?,?45 0/5/72,?56/56,?44/44?,45 0/5/56,90 0/5/56,44/44,?90 0/5/56,44/22L,72/72,?72/72,64/64,?56/56,?56/56,?44/44,?44/44,44/44。
During operation:
1.. the use of screwing element 3
Screwing element 3 is divided into forward and reverse thread, and the forward screw thread is mainly used in the conveying of material, and reverse thread mainly plays the back-mixing effect of supercharging and material, and the geometric parameter of screwing element 3 mainly contains helical pitch and spiral groove depth, can be divided into large, medium and small helical pitch; Spiral groove depth has deeply, in, shallow minute,
Large helical pitch refers to that pitch is 1.5d~d(d screw diameter); Little helical pitch refers to that pitch is about 0.4d, and along with helical pitch increases, the Screw Extrusion amount increases, and residence time of material reduces, and mixed effect reduces; The occasion of selecting steep-lead thread is that to carry be main, is beneficial to raising output;
Selecting middle helical pitch screw thread occasion is to carry with supercharging to be mixed into the master;
Selecting the occasion of little helical pitch screw thread, generally is in the combination that screwing element 3 helical pitches reduce gradually, is used for A solid conveying section and E homogenizing metering section, plays supercharging, improves melting; Improve the stability of extruding of mixture.  
2.. the use of kneading member 4
Kneading member 4 is key elements of double screw extruder, its Main Function provides strong shearing force, material is realized high degree of dispersion by the shear action of kneading member 4, when material is distinguished by mediating, its interface is different from shear direction, because the shearing force effect makes material constantly update the interface, makes material refinement and homogenizing.
⑴. direction: forward and is oppositely arranged---oppositely, the conveying of material there is inhibition, plays time expand, improve the effect that increases pressure and melting effect of filling;
⑵. angle: what " 30 °, 45 °, 60 °, 90 ° " were generally arranged divides its effect and effect: during forward, increases alternate angle, will reduce conveying capacity, prolong the time of staying, improve melting effect, but easier leakage current; In the time of oppositely, increase angle, will reduce the effectively restriction of polymer, but easier leakage current;
Spiral shell rib width generally has 7mm, 11mm, 11.2mm, 14mm, 19mm etc., and this is to weigh one of most important parameters shearing size and mixed size, and the larger mixing of the larger shearing of width is less; The less mixing of the less shearing of width is larger.
The screw rod 1 of double screw extruder can be divided into 5 sections: A solid conveying section, B melt zone, C mixing section, D exhaust section and E homogenizing zone.
The segmentation of screw rod 1 and function thereof:
1. solid conveying section A: mainly be convey materials and prevent flash; Solid conveying section comprises following element: 56/56A, 72/72,72/72SK, and 72/36SK, 64/64,56/56,44/44,44/44,44/44,
At the A solid conveying section, because the polymer raw material morphological differences, filler or additive are different, require this section larger appearance material space to be arranged to adapt to the adjustment of feeding quantity, prevent that material from producing flash in the spout accumulation; Its mode has two kinds, and a kind of is to adopt deep trouth forward screw thread, and another kind is to adopt the large helical pitch forward of medium screw channel screw thread; Solid conveying zone also can or improve the degree of filling of granular material in screw rod with loose granular material compacting except conveying function, to promote material at the fusion plastification in next district; Therefore, the screw channel volume-variation in this district is because of descending, the descending gradual change of the helical pitch of its screw thread, and what the utility model adopted is the large helical pitch forward of medium screw channel screw thread;
2. melt zone B: by heat transmission and fricting shearing, make the abundant melting of material and homogenizing; B melt zone element arrangements is as follows: 45 0/ 5/56,45 0/ 5/56,60 0/ 4/44,56/56,45 0/ 5/56,45 0/ 5/56,45 0/ 5/56L, 44/44,
90 0/ 5/56,44/22L, at this section, material is subject to beginning melting after certain compression through the delivery area, and mixes, and makes the thermal source of material melting that two kinds of sources be arranged, the one, the external heat that the machine barrel heating provides, another is the shear heat of screw rod, and the high shear forces that the shear heat of screw rod relies on this district's element to produce produces, and distinguishes because kneading member 4, reverse thread or steep-lead thread element 3 are set at this;
3. mixing section C makes the further refinement of material component size with even, forms desirable structure, and C mixing section element arrangements is as follows:
72/72,72/72,56/56,44/44,44/44,45 0/ 5/56,45 0/ 5/56,56/56,44/44,60 0/ 4/44,45 0/ 5/72,56/56,44/44,45 0/ 5/56,90 0/ 5/56,44/44,90 0/ 5/56,44/22L, material is in melting state behind melting process, mixing between each component of co-mixing system begins just to mix from melting, and the dispersed phase polymer size occurs further sharply to change the micron order when finishing from elementary millimetre-sized macroparticle to melting, and the effect of mixed zone is exactly with the further refinement of component and homogenizing, therefore, the elements combination in this district is take kneading member 4 as main body, and screwing element 3 is that the district is mediated in auxiliary composition high shear;
4. exhaust section D: discharge the impurity such as steam and low molecular weight substance; D exhaust section element arrangements is as follows:
72/72,72/72, the Flow of Goods and Materials feature of exhaust area is the after compression suddenly decompression of material of complete molten condition, the volatile material is rapidly volatilization under vacuum condition, break away from melt, in next-door neighbour's exhaust area starting position left-hand thread element 3 or reverse kneading member 4 are set, with melt sealant, set up high pressure; Exhaust area adopts steep-lead thread element 3, to form low degree of filling and thin melt zone, makes material that the Free Surface that can expose be arranged, and is beneficial to gas purging;
5. homogenizing (metering) section E: homogenizing (metering) section E element arrangements is as follows:
64/64,56/56,56/56,44/44,44/44,44/44, this section is mainly used in melt Conveying and supercharging, sets up certain pressure, make die orifice place material that certain density be arranged, further mix simultaneously, finally reach the purpose of smooth extruding pelletization, the screw configuration in this district should be realized supercharging by screwing element 3 helical pitch gradual changes or screw channel gradual change.
Its advantage is: because nylon (polyamide PA) extrusion molding is added man-hour, exempted the front oven dry link to nylon (polyamide PA) of processing, under this process conditions, nylon (polyamide PA) can not foam, good mechanical properties, this screw combinations are fully volatilized the moisture in the nylon (polyamide PA), keep the stable mechanical property of nylon, and energy savings, reduce production costs.
Above-described embodiment is described preferred embodiment of the present utility model; be not that scope of the present utility model is limited; under the prerequisite that does not break away from the utility model design spirit; various distortion and improvement that those of ordinary skills make the technical solution of the utility model all should fall in the definite protection domain of the utility model claims.

Claims (6)

1. one kind is used for extrusion molding processing nylon and need not nylon is carried out the screw combinations of drying and processing, it comprises extruding machine, it is characterized in that: make up with the identical screw rod of two root architectures (1) on the extruding machine, screw rod (1) comprises the splined shaft (2) with spline, screwing element (3) and kneading member (4), the endoporus of screwing element (3) and kneading member (4) is with the spline (5) corresponding with the spline on the splined shaft (2), a plurality of differences just, reverse screwing element (3) with a plurality of different just, reverse kneading member (4) is arranged in order and is enclosed within on the splined shaft (2), and the two ends of splined shaft (2) are fixing with the screwing element (3) and the kneading member (4) that arrange; Turning to of two screw rods (1) is identical, during assembling, and 90 ° of phase angles of two screw rods (1) phase phasic difference; Every screw rod is divided into: totally 5 sections of solid conveying section (A), melt zone (B), mixing section (C), exhaust section (D) and homogenizing zones (E).
2. the screw combinations that need not nylon is carried out drying and processing for extrusion molding processing nylon according to claim 1, it is characterized in that: described screw rod (1) length is 2600mm, diameter is 65mm.
3. the screw combinations that need not nylon is carried out drying and processing for extrusion molding processing nylon according to claim 1, it is characterized in that: described a plurality of differences just, reverse screwing element (3) represents with X/Y and X/YSK respectively, wherein X represents that the helical pitch unit of screwing element (3) is mm, Y represents that the long measure of screwing element (3) is mm, SK among the X/YSK refers to that the screw channel of screwing element (3) is darker, tapering is arranged at the screw channel bottom, X/Y and X/YSK represent that screwing element (3) is the forward screw thread, and X/YL represents that screwing element (3) is reverse thread.
4. the screw combinations that need not nylon is carried out drying and processing for extrusion molding processing nylon according to claim 3 is characterized in that: in the described a plurality of different forward and reverse screwing element (3) that represents with X/Y, X/YSK and X/YL X/Y, X/YSK and X/YL have various concrete data as:
72/72SK, 72/36SK, 72/72,64/64,56/56,44/44, in the reverse thread element (3) that its X/YL represents 44/22L is arranged, m * X/Y or m * X/YL represent that the identical forward and reverse screwing element (3) of specification is m, and such as 2 * 72/36 or 2 * 44/22L, expression has 2 72/36 or 2 45 0The screwing element of/5/56L (3).
5. the screw combinations that need not nylon is carried out drying and processing for extrusion molding processing nylon according to claim 3, it is characterized in that: the described forward and reverse kneading member (4) of a plurality of differences that represents with α/n/Z, α represents the error angle of kneading member (4), n represents the number of kneading block, and Z represents the length of whole kneading member (4); α/n/Z represents forward kneading member (4), and α/n/ZL represents reverse kneading member (4), and its concrete data are 45 0/ 5/56,60 0/ 4/44,45 0/ 5/72,90 0/ 5/56, oppositely kneading member (4) is such as 45 0/ 5/56L, m * α/n/Z or m * α/n/ZL represent that the identical forward and reverse kneading member (4) of specification is m; Such as 2 * 45 0/ 5/56 or 2 * 45 0/ 5/56L, expression has 2 45 0/ 5/56 or 2 45 0/ 5/56 kneading member (4).
6. according to claim 1 for extrusion molding processing nylon and need not nylon is carried out the screw combinations of drying and processing, it is characterized in that: in the described every screw rod (1),
Solid conveying section (A) comprises following element:
56/56A?,72/72,?72/72SK?,?72/36SK,?64/64,?56/56,44/44,44/44,44/44;
Melt zone (B) element arrangements is as follows: 45 0/ 5/56,45 0/ 5/56,60 0/ 4/44,56/56,45 0/ 5/56,45 0/ 5/56,45 0/ 5/56L, 44/44,
90 0/5/56,44/22L;
Mixing section (C) element arrangements is as follows: 72/72,72/72,56/56,44/44,44/44,45 0/ 5/56,45 0/ 5/56,56/56,44/44,60 0/ 4/44,45 0/ 5/72,56/56,44/44,45 0/ 5/56,90 0/ 5/56,44/44,90 0/ 5/56,44/22L;
Exhaust section (D) element arrangements is as follows: 72/72,72/72;
Homogenizing zone (E) element arrangements is as follows: 64/64,56/56,56/56,44/44,44/44,44/44.
CN201220029958XU 2012-01-30 2012-01-30 Screw assembly for extrusion processing of nylon without nylon drying process Withdrawn - After Issue CN202764180U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201220029958XU CN202764180U (en) 2012-01-30 2012-01-30 Screw assembly for extrusion processing of nylon without nylon drying process

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Application Number Priority Date Filing Date Title
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Publication Number Publication Date
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102529062A (en) * 2012-01-30 2012-07-04 天津戈瑞德新材料科技有限公司 Screw rod assembly used for extrusion processing without dry processing to nylon
CN104149304A (en) * 2014-07-04 2014-11-19 广东聚石化学股份有限公司 Twin screw for controlling flame-retardant polypropylene material to be decomposed in machining process

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102529062A (en) * 2012-01-30 2012-07-04 天津戈瑞德新材料科技有限公司 Screw rod assembly used for extrusion processing without dry processing to nylon
CN102529062B (en) * 2012-01-30 2015-05-20 天津万塑新材料科技有限公司 Screw rod assembly used for extrusion processing without dry processing to nylon
CN104149304A (en) * 2014-07-04 2014-11-19 广东聚石化学股份有限公司 Twin screw for controlling flame-retardant polypropylene material to be decomposed in machining process

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