CN115447094A - Extrusion device for preparing BOPA film and preparation process thereof - Google Patents

Abstract

The application discloses an extrusion device for preparing a BOPA film and a preparation process thereof, and the extrusion device comprises a machine body, a feed chute, a discharge port, a heater and an extrusion screw driven by a motor, wherein the machine body comprises a main body, and the top of the machine body is provided with a notch; the cover, a pair of mechanism that opens and shuts, set up respectively in the main part both sides, be used for controlling the cover to open and shut, the mechanism that opens and shuts includes the linkage unit, pass unit and locking unit, in daily use, through adopting above-mentioned technical scheme, when needing to clear up the organism inner wall, make the unblock unit remove the locking to the cover, then the unit operation is passed in the control, make the cover remove towards the bin outlet, the back uses the linkage unit to overturn as the base point, the one end that the bin outlet was kept away from to the cover is lifted, make the notch open, expose the internal cavity, make things convenient for the staff to clear up internal cavity of the machine and extrusion screw.

Description

Extrusion device for preparing BOPA film and preparation process thereof

Technical Field

The invention relates to an extrusion device for preparing a BOPA film and a preparation process thereof.

Background

BOPA is a biaxially oriented nylon film (BOPA) which is an important material for producing various composite packaging materials and is the third packaging material after BOPP and BOPET films at present, and two processes of a tube film stretching method and a plane biaxial stretching method are mainly adopted for preparing the BOPA at present;

the principle of the tube film method is that a tube is extruded firstly, the thickness of the tube is 40-50 times of that of a film product, then the tube is cooled in a water bath, and then the film is stretched longitudinally and transversely by blowing a bubble tube;

the plane drawing method is that the melted mass of high molecular polymer is made into sheet or thick film through the machine head, then the sheet or thick film is drawn in two vertical directions in a special drawing machine under the condition of certain temperature and speed, and the film is made through proper cold and hot treatment or special processing (such as corona, etc.);

in the process of preparing the film, in order to ensure the product quality, the extrusion device must be cleaned again after being started for a certain time to prevent yellow materials and coke materials from entering normal materials. However, in the process of cleaning the equipment, the inner wall of the extruder is particularly difficult to clean, and especially when the inner wall of the extruder is required to be cleaned after the high molecular polymer melt passes through the inner wall of the extruder, the cleaning is complex, time-consuming and labor-consuming.

And the performance parameters of the current BOPA film are as follows: the thickness deviation is +/-10 percent, the average thickness deviation is +/-3 percent, the longitudinal tensile strength is more than or equal to 180MPa, the transverse tensile strength is more than or equal to 180MPa, the longitudinal heat shrinkage rate is less than or equal to 3 percent, the transverse heat shrinkage rate is less than or equal to 2.5 percent, and the haze is less than or equal to 10, and the performances of the aluminum plastic film and the medical bag in the aspects of balance, impact resistance and ductility can not meet the requirements of being used as the aluminum plastic film and the medical bag.

Disclosure of Invention

The invention aims to solve one of the technical problems in the prior art.

The application provides an extrusion device is used in BOPA membrane preparation, include organism, feed chute, bin outlet, heater and through motor drive's extrusion screw, the organism includes:

a main body, the top of which is provided with a notch;

a cover openably and closably mounted on the body for closing the slot;

a pair of opening and closing mechanisms respectively arranged at two sides of the main body and used for controlling the opening and closing of the machine cover;

wherein, the feed chute is arranged on the top of the cover and is far away from the discharge port end.

The mechanism that opens and shuts includes:

a connection unit for movably mounting the cover on the top of the main body;

the pushing unit is matched with the connecting unit and drives the cover to move towards the discharge opening and to be far away from the discharge opening end to be turned and opened by taking the connecting unit as a base point;

and the locking unit is used for fixing the cover to be far away from the discharge port end when the cover closes the notch.

The connection unit includes:

a pair of lapping edges which are respectively and integrally formed at the bottom of the outer side wall of the machine cover and the top of the outer side wall of the main body;

the side plate is integrally formed and arranged on the outer side wall of the upper side lap and extends downwards, and the inner side wall is abutted with the outer side wall of the lower side lap;

the guide groove comprises a limiting part and a guide part and is arranged at the end of the side plate far away from the feeding groove;

the support groove is arranged on the side plate and is positioned between the guide groove and the discharge port;

the pair of transmission columns are respectively installed in the guide groove and the support groove in a sliding manner;

wherein, the limiting part is in the shape of a circular arc and is concentric with the transmission column positioned in the supporting groove.

The pushing unit includes:

the screw rod is rotatably arranged on one side of the main body and is driven by the first motor;

the transmission screw sleeve is installed on the lead screw in a transmission manner;

one end of the linkage swing arm is hinged with the transmission threaded sleeve, and the other end of the linkage swing arm is hinged with the side plate;

wherein, the lead screw is arranged in parallel with the lapping edge, and the guide groove, the support groove and the pair of transmission columns are arranged between the linkage swing arm and the discharge opening.

The locking unit includes:

a locking plate integrally formed at an end of the side plate away from the guide groove and extending downward;

a locking groove arranged on the inner side wall of the locking plate;

the telescopic groove is arranged on the outer side wall of the main body and corresponds to the locking groove;

the locking sliding block is movably arranged in the telescopic groove, and the outer end of the locking sliding block can be clamped with the locking groove;

the first spring is arranged between the inner end of the locking slide block and the bottom end of the telescopic groove;

the reset piece comprises a pull rod and is used for enabling the outer end of the locking sliding block to retract into the telescopic groove.

Reset the piece and include:

the outer sliding chute is communicated with the outer wall of the main body, which is far away from the material discharge port end, and the telescopic chute;

the inner sliding groove is arranged on the inner side wall of the telescopic groove and is opposite to the outer sliding groove;

the linkage groove is arranged on the side wall of the locking slide block, which is far away from the outer sliding groove, and corresponds to the inner sliding groove;

the transverse through groove is communicated with the outer side wall, far away from the inner sliding groove, of the locking sliding block and the linkage groove;

the linkage block is slidably arranged in the inner chute, and the outer end of the linkage block is obliquely arranged;

wherein, one end of the pull rod is movably inserted through the outer chute, the transverse through groove and the linkage groove and then is fixedly connected with the outer end of the linkage block.

The piece that resets still includes:

the clamping slide block is fixedly arranged on the outer wall of the pull rod and is in sliding fit with the outer sliding chute;

the clamping groove is arranged on the side wall of the locking slide block facing the outward sliding groove and is used for clamping and matching with the clamping slide block;

the cover plate is fixedly arranged at the outer end of the outer chute through a fastener;

and the spring II is sleeved outside the pull rod, and two ends of the spring II are respectively abutted against opposite sides of the cover plate and the clamping slide block.

Further comprising:

a lower ring groove including a pair of straight portions and a pair of arc portions;

the upper ring groove is arranged on the bottom surface of the machine cover and corresponds to the lower ring groove;

the sealing rings are arranged in the lower ring groove and the upper ring groove in a lifting manner;

the lifting driving unit is used for controlling the sealing ring to lift between the upper ring groove and the lower ring groove;

wherein, a pair of straight limit portion sets up respectively at each upper side and takes along the top, and a pair of arc portion sets up both ends and communicates with a pair of straight portion around the main part top respectively.

The elevating driving unit includes:

the lifting frame is fixedly arranged on the top surface of the sealing ring through glue or a fastener;

the plurality of vertical through grooves are arranged on the top surface of the machine cover, distributed at intervals along the edge of the machine cover and communicated with the upper ring groove;

the plurality of screws are fixedly installed at the top of the lifting frame through welding and are respectively inserted into the vertical through grooves;

the internal thread pipe sleeves are provided with internal threads and are respectively in transmission connection with the screw rods through threads;

and the second motors are fixedly arranged at the top of the machine cover through supports respectively, and the output ends of the second motors are fixedly connected with the internal thread pipe sleeves.

Simultaneously discloses a preparation process of the BOPA film, which comprises the following steps:

s1, uniformly mixing the raw materials, putting the mixture into an extrusion device for melt extrusion and sheet casting, wherein the sheet casting temperature is 26 ℃;

s2, scanning the thickness of the cast piece by using a non-contact thickness gauge;

s3, preprocessing after primary thickness measurement;

s4, synchronously stretching at the stretching temperature of 180-210 ℃;

s5, trimming and recycling the side edges;

s6, performing corona treatment after secondary thickness measurement;

s7, winding, cutting and warehousing;

wherein, the raw materials comprise the following components in percentage by weight:

component 1: 80-92% of PA6 (polyamide-6), 2-3% of smooth master batch, 2-5% of antioxidant master batch, 1.5-5% of antistatic master batch and 2.5-5% of impact resistant master batch;

or comprises the following steps:

and (2) component: 80-90% of PA6 (polyamide-6), 1-3% of smooth master batch, 3-5% of antioxidant master batch, 0.5-2% of antistatic master batch, 3-5% of open master batch, 0.5-2% of dispersing master batch and 2-3% of antibacterial master batch.

The invention has the following beneficial effects:

1. through the arrangement of the connecting unit, the pushing unit and the locking unit, the cover is movably arranged on the main body and is controlled to be opened and closed, so that workers can conveniently clean the inner wall of the machine body and the extrusion screw;

2. through the arrangement of the lapping edge, the side plate, the guide groove, the support groove and the transmission column and the matching of the lapping edge, the side plate, the guide groove, the support groove and the transmission column, the cover is turned and opened by taking the support groove and the transmission column as base points after moving towards the discharge opening, when the cover is closed, the overlapping area of the inner wall and the outer wall of the main body is large, the sealing effect is ensured, and the end part of the cover is prevented from colliding with the outer wall of the main body when the cover is opened;

3. through the arrangement of the lower ring groove, the upper ring groove, the sealing ring and the lifting drive unit, the cover and the main body are sealed after the cover is closed, and high-temperature molten mass in the main body is prevented from leaking from a gap between the cover and the main body;

4. the BOPA film prepared from the raw materials of the component 1 and the component 2 has good balance, impact resistance and ductility, and can be used as an aluminum plastic film and a medicine bag respectively.

Drawings

FIG. 1 is a schematic view of the external structure of an extrusion apparatus for BOPA film production in the embodiment of the present application when the lid is closed;

FIG. 2 is a schematic view showing the external structure of an extrusion apparatus for BOPA film production in the embodiment of the present application when a cover is opened;

FIG. 3 is a schematic diagram showing the internal structure of an extrusion apparatus for BOPA film production in the embodiment of the present application when a lid is closed;

FIG. 4 is a schematic view showing the external structure of an extrusion apparatus for BOPA film production in the embodiment of the present application when a cover is opened;

FIG. 5 is an enlarged view of a portion A of FIG. 3;

FIG. 6 is a schematic structural diagram of a locking unit in the embodiment of the present application;

FIG. 7 is a schematic structural diagram of a lifting slider in an embodiment of the present application;

FIG. 8 is a flow chart of a process for preparing a BOPA film in an example of the present application;

FIG. 9 is a table comparing key data for prior BOPA films to BOPA films used as plastic-aluminum films and medicated bags in the present application.

Reference numerals

1-machine body, 101-main body, 102-notch, 103-machine cover, 2-connecting unit, 201-lap edge, 202-side plate, 203-guide groove, 203 a-limiting part, 203 b-guide part, 204-support groove, 205-transmission column, 3-push unit, 301-lead screw, 302-transmission screw sleeve, 303-motor I, 304-linkage swing arm, 4-locking unit, 401-locking plate, 402-locking groove, 403-telescopic groove, 404-locking slide block, 405-spring I, 406-upper conductive ring, 407-lower conductive ring, 5-reset piece, 501-outer sliding groove, 502-inner sliding groove, 503-linkage groove, 504-transverse groove, 505-linkage block, 506-clamping slide block, 507-clamping groove, 508-cover plate, 509-spring II, 510-pull rod, 601-lower annular groove, 602-upper annular groove, discharge-sealing ring, 7-lifting driving unit, 701-lifting frame, 702-through groove, 703-lead screw, 703-vertical screw, 705-internal thread, pipe sleeve, 8-9-screw, and 10-extrusion port.

Detailed Description

The technical solutions in the embodiments of the present application will be described below clearly with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments that can be derived by one of ordinary skill in the art from the embodiments given herein are intended to be within the scope of the present disclosure.

The terms first, second and the like in the description and in the claims of the present application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It will be appreciated that the data so used may be interchanged under appropriate circumstances such that embodiments of the application may be practiced in sequences other than those illustrated or described herein, and that the terms "first," "second," and the like are generally used herein in a generic sense and do not limit the number of terms, e.g., the first term can be one or more than one. In addition, "and/or" in the specification and claims means at least one of connected objects, a character "/", and generally means that the former and latter related objects are in an "or" relationship.

The server provided in the embodiments of the present application is described in detail with reference to the accompanying drawings through specific embodiments and application scenarios thereof.

Example 1:

as shown in fig. 1 to 4, the present application provides an extrusion apparatus for BOPA film production, including a body 1, a feed chute 8, a discharge opening 9, a heater, and an extrusion screw 10 driven by a motor, where the body 1 includes a main body 101, and a notch 102 is formed at the top of the main body; a cover 103 openably and closably mounted on the body 101 for closing the slot 102; a pair of mechanism that opens and shuts sets up respectively in main part 101 both sides for control cover 103 opens and shuts, feed chute 8 installs and keeps away from bin outlet 9 end at the cover 103 top.

Further, the opening and closing mechanism includes a connection unit 2 for movably mounting the cover 103 on the top of the main body 101; the pushing unit 3 is used for matching with the connecting unit 2 and driving the cover 103 to move towards the discharge opening 9 and make the end far away from the discharge opening 9 turn over and open by taking the connecting unit 2 as a base point; a locking unit 4 for fixing the end of the cover 103 away from the discharge opening 9 when the cover 103 closes the slot 102.

In the embodiment of the application, due to the above structure, when the melt extrusion operation is performed, the cover 103 is closed, the opening 102 is closed, the material enters the machine body 1 through the feed chute 8, the melt is formed after being heated by the heater (which may be an electric heating net), the melt is extruded from the discharge opening 9 under the action of the extrusion screw 10 driven by the motor to rotate, after a certain time of starting, the material is stopped to be added into the feed chute 8, the remaining melt in the standby body 1 is discharged from the discharge opening 9 under the action of the extrusion screw 10, the heater and the motor are stopped to operate, the locking unit 4 is operated to release the fixation of the end of the cover 103 far away from the discharge opening 9, the pushing unit 3 is started to push the cover 103 to move towards the discharge opening 9 until one end of the cover 103 moves to the position above the discharge opening 9, pushing unit 3 continues to operate, at this time, the end part of cover 103 located above discharge opening 9 rotates with connection unit 2 as a base point, the end of cover 103 far away from discharge opening 9 is turned over and opened, notch 102 is opened, when cover 103 reaches enough opening, pushing unit 3 stops operating, pushing unit 3 is driven by servo motor and can be self-locked, and cover 103 is prevented from falling after being opened, after cleaning is completed, pushing unit 3 is started, cover 103 rotates with connection unit 2 as a base point, one end of cover 103 far away from discharge opening 9 descends until the bottom surface of cover 103 abuts against the top surface of main body 101, pushing unit 3 continues to operate, cover 103 moves towards notch 102 until cover 103 completely covers notch 102, pushing unit 3 stops operating, and cover 103 is fixed by locking unit 4.

Example 2:

as shown in fig. 1 to 2, in the present embodiment, in addition to the structural features of the previous embodiment, the connection unit 2 includes a pair of ledges 201 integrally formed at the bottom of the outer sidewall of the cover 103 and the top of the outer sidewall of the main body 101, respectively; a side plate 202 integrally formed on an outer side wall of the upper side lap 201 and extending downward, the inner side wall abutting against an outer side wall of the lower side lap 201; a guide groove 203 which comprises a limiting part 203a and a guiding part 203b and is arranged at the end of the side plate 202 far away from the feed chute 8; a support groove 204 provided on the side plate 202 between the guide groove 203 and the discharge opening 9; and a pair of transmission columns 205 which are respectively and slidably installed in the guide grooves 203 and the support grooves 204, wherein the limiting parts 203a are arc-shaped and are concentric with the transmission columns 205 positioned in the support grooves 204.

Further, the pushing unit 3 comprises a screw 301 which is rotatably mounted on one side of the main body 101 and is driven by a first motor 303; a transmission screw sleeve 302 which is installed on the lead screw 301 in a transmission manner; one end of the linkage swing arm 304 is hinged with the transmission threaded sleeve 302, the other end of the linkage swing arm is hinged with the side plate 202, the screw rod 301 is arranged in parallel with the lapping edge 201, and the guide groove 203, the support groove 204 and the pair of transmission columns 205 are positioned between the linkage swing arm 304 and the discharge opening 9.

In this embodiment of the application, due to the above-mentioned structure, when the cover 103 needs to be opened, the first motor 303 is started, the lead screw 301 and the transmission screw 302 operate simultaneously, the transmission screw 302 in threaded transmission connection with the lead screw 301 moves towards the discharge opening 9, the side plate 202 is pushed by the linkage swing arm 304, the cover 103 moves towards the discharge opening 9, each transmission column 205 slides in the limiting part 203a and the support groove 204 of the guide groove 203 respectively, so that the cover 103 moves in parallel, until one end of the cover 103 far away from the feed groove 8 moves above the discharge opening 9, at this time, one transmission column 205 moves to the connection between the limiting part 203a and the guide part 203b, the other transmission column 205 abuts against one end of the support groove 204 far away from the discharge opening 9, with the operation of the first motor 303, the transmission screw 302 continues to move towards the discharge opening 9, the linkage swing arm 304 and the side plate 202 operate simultaneously, the transmission column 205 located in the guide groove 203 slides towards the guide part 203b, the outer wall of the other transmission column 205 and the inner wall of the support groove 204 and the inner wall of one end of the support groove far away from the discharge opening 9, so that the cover 103 and the end of the cover 103, when the cover 103, which is in the fixed point of the cover 103, the fixed motor 205, the cover 103, the end of the cover can stop rotating and the motor 301, and the motor 103, and the opening is enough, and the cover 103, and the opening is started;

when the cover 103 is closed, the first motor 303 is started, the lead screw 301 and the transmission screw 302 act simultaneously, the transmission screw 302 in threaded transmission connection with the lead screw 301 moves towards the direction far away from the discharge port 9, the side plate 202 is pulled through the linkage swing arm 304, the cover 103 rotates around the transmission column 205 in rotary fit with the support groove 204, the other transmission column 205 slides towards the limiting part 203a in the guide part 203b of the guide groove 203 until the bottom surface of the cover 103 is abutted against the top surface of the body, the transmission column 205 positioned in the guide groove 203 moves to the connection part of the guide part 203b and the limiting part 203a, along with the continuous operation of the first motor 303, each transmission column 205 slides in the limiting part 203a and the limiting groove of the guide groove 203 respectively until the cover 103 completely covers the notch 102, the first motor 303 stops operating, and the end of the side plate 202 far away from the discharge port 9 is fixed through the locking unit 4, so that the cover 103 is fixed;

it should be noted that, the driving screw 302 is driven by the lead screw 301 to operate, and since the interlocking swing arm 304 is located below the side plate 202, the guide groove 203 and the support groove 204 are disposed on the side plate 202, and an included angle exists between the interlocking swing arm 304 and the side plate 202, the limiting portion 203a of the guide groove 203 and the support groove 204, the force applied to the side plate 202 by the interlocking swing arm 304 is not parallel to the force of the side plate 202, but is parallel to the force of the interlocking swing arm 304.

Example 3:

as shown in fig. 6 to 7, in the present embodiment, in addition to the structural features including the foregoing embodiment, the locking unit 4 includes a locking plate 401 integrally formed at the end of the side plate 202 remote from the guide groove 203 and extending downward; a lock groove 402 provided on an inner side wall of the lock plate 401; a telescopic groove 403 provided on an outer side wall of the main body 101 to correspond to the locking groove 402; a locking slide block 404 which is movably arranged in the telescopic groove 403, and the outer end of the locking slide block can be clamped with the locking groove 402; a first spring 405 installed between the inner end of the locking slider 404 and the bottom end of the telescopic slot 403; a restoring member 5 including a pull rod 510 for retracting the outer end of the locking slider 404 into the telescopic groove 403;

further, the locking unit 4 further includes an upper conductive ring 406 and a lower conductive ring 407, the upper conductive ring 406 is mounted at the bottom end of the locking slider 404, the lower conductive ring 407 is mounted at the bottom end of the telescopic slot 403, when the upper conductive ring 406 is in contact with the lower conductive ring 407, the circuit of the first motor 303 is switched on, and when the upper conductive ring 406 is separated from the lower conductive ring 407, the circuit of the first motor 303 is switched off.

In this embodiment of the application, due to the adoption of the above structure, when the cover 103 needs to be opened, the pull rod 510 is pulled, the reset piece 5 cooperates with the locking slider 404 to move, so that the locking slider 404 is separated from the locking groove 402 and retracts into the telescopic groove 403, the upper conductive ring 406 is contacted with the lower conductive ring 407, the first spring 405 is compressed and shortened to store elastic potential energy, at this time, the first motor 303 is started, so that the cover 103 is opened, after the standby cover 103 is opened, the pull rod 510 is released, the first spring 405 releases the elastic potential energy, so that the locking slider 404 extends out of the telescopic groove 403, the upper conductive ring 406 is separated from the lower conductive ring 407, the circuit of the first motor 303 is disconnected, and the first motor 303 stops operating;

when the cover 103 is closed, the pull rod 510 is pulled, the reset piece 5 and the locking slide block 404 are in matched action, the locking slide block 404 is separated from the locking groove 402 and retracts into the telescopic groove 403, the upper conductive ring 406 is in contact with the lower conductive ring 407, the first spring 405 is compressed and shortened, elastic potential energy is stored, the first motor 303 is started at the moment, the cover 103 is closed, after the standby cover 103 is closed, the pull rod 510 is loosened, the first spring 405 discharges the elastic potential energy, the locking slide block 404 is inserted into the locking groove 402, the upper conductive ring 406 is separated from the lower conductive ring 407, a circuit of the first motor 303 is disconnected, and the first motor 303 stops running;

it should be noted that the action of pulling the pull rod 510 needs to be performed manually, so that the first motor 303 can only be operated when a worker is present and pulls the pull rod 510 to make the upper conductive ring 406 and the lower conductive ring 407 contact, which can effectively prevent the first motor 303 from being operated when the locking slider 404 is not separated from the locking groove 402 due to misoperation, thereby causing damage to the equipment, causing a gap between the cover 103 and the main body 101, and causing leakage of a high-temperature melt.

Example 4:

as shown in fig. 6 to 7, in the present embodiment, in addition to the structural features of the previous embodiments, the restoring member 5 includes an outer chute 501, which connects the outer wall of the end of the main body 101 away from the discharge opening 9 and the telescopic chute 403; an inner chute 502 provided on an inner side wall of the telescopic slot 403 opposite to the outer chute 501; a linkage groove 503 which is arranged on the side wall of the locking slide block 404 far away from the outer slide groove 501 and corresponds to the inner slide groove 502; a transverse through groove 504 which communicates the outer side wall of the locking slide block 404 away from the inner sliding groove 502 with the linkage groove 503; and the linkage block 505 is slidably mounted in the inner sliding groove 502, the outer end of the linkage block is obliquely arranged, and one end of the pull rod 510 movably penetrates through the outer sliding groove 501, the transverse through groove 504 and the linkage groove 503 and then is fixedly connected with the outer end of the linkage block 505.

Further, the reset element 5 further comprises a clamping slide block 506, which is fixedly mounted on the outer wall of the pull rod 510 and is in sliding fit with the outer sliding groove 501; the clamping groove 507 is arranged on the side wall of the locking slide block 404 facing the outward sliding groove 501 and is used for clamping and matching with the clamping slide block 506; a cover plate 508 fixedly mounted at the outer end of the outer chute 501 by a fastener; and a second spring 509 sleeved outside the pull rod 510, wherein two ends of the second spring are respectively abutted against opposite sides of the cover plate 508 and the clamping slide block 506.

In this embodiment of the application, due to the above structure, when the locking slide needs to be retracted into the telescopic slot 403, the pull rod 510 is pulled in a direction away from the locking slider 404, the linkage block 505 slides towards the linkage slot 503, the engaging slider 506 slides towards the outer sliding slot 501, the inclined end of the linkage block 505 abuts against the inner side wall of the linkage slot 503, the engaging slider 506 disengages from the engaging slot 507, the second spring 509 is pressed to shorten the stored elastic potential energy, the pull rod 510 slides in the transverse slot 504, the pull rod 510 is continuously pulled, the inclined end of the linkage block 505 slides relative to the inclined inner wall of the linkage slot 503 to push the locking slider 404 to move towards the bottom end of the telescopic slot 403, the first spring 405 is pressed to shorten the stored elastic potential energy, and at this time, the first motor 303 is started to open the cover 103; when the locking slider 404 is required to be inserted into the locking groove 402, a worker loosens the pull rod 510, elastic potential energy is released by the first spring 405 and the second spring 509, the clamping block moves towards the clamping groove 507, the linkage block 505 moves towards the direction away from the outer chute 501 until the clamping block contacts with the outer side wall of the locking slider 404, the locking slider 404 continues to ascend and is in sliding friction with the clamping block until the clamping block is inserted into the locking groove 402, the clamping block corresponds to the clamping groove 507 and is inserted into the clamping groove 507 under the action of the second spring 509, so that the locking slider 404 and the locking groove 402 are fixed when being clamped with each other, and the fixing effect of the locking unit 4 on the cover 103 away from the discharge port end is improved.

Example 5:

as shown in fig. 3 to 5, in the present embodiment, in addition to the structural features of the previous embodiments, a lower ring groove 601 is further included, which includes a pair of straight portions and a pair of arc portions; an upper ring groove 602 provided on the bottom surface of the cover 103 to correspond to the lower ring groove 601; the sealing rings 603 are arranged in the lower ring groove 601 and the upper ring groove 602 in a lifting manner; and a lifting driving unit 7 for controlling the sealing ring 603 to lift between the upper ring groove 602 and the lower ring groove 601, wherein a pair of straight edge portions are respectively arranged at the top of each upper lapping edge 201, and a pair of arc-shaped portions are respectively arranged at the front end and the rear end of the top of the main body 101 and are communicated with the pair of straight edge portions.

Further, the lifting driving unit 7 includes a lifting frame 701 fixedly mounted on the top surface of the sealing ring 603 through glue or a fastener; a plurality of vertical through grooves 702 arranged on the top surface of the cover 103, distributed at intervals along the edge thereof and communicated with the upper ring groove 602; a plurality of screws 703 fixedly installed on the top of the lifting frame 701 by welding and respectively inserted into the vertical through grooves 702; a plurality of internal thread pipe sleeves 704 which are provided with internal threads and are respectively in transmission connection with the screw rods 703 through threads; and a plurality of second motors 705 are respectively and fixedly arranged at the top of the cover 103 through brackets, and the output ends of the second motors are fixedly connected with the internal thread pipe sleeves 704.

In this embodiment of the present application, due to the above structure, the cover 103 is closed, and the locking mechanism fixes the cover away from the feed port end, the pair of transmission columns 205 are respectively located in the limiting portion 203a and the limiting groove of the guide groove 203, at this time, the upper and lower sides of the pair of transmission columns 205 are respectively in contact with the upper and lower sides of the limiting portion 203a of the guide groove 203 and the upper and lower sides of the limiting groove, and the cover 103 is not able to move horizontally or turn over, at this time, each motor two 705 is started, each internal thread pipe sleeve 704 moves synchronously with the corresponding screw 703, each screw 703 moves in the direction away from the motor two 705, the lifting frame 701 is pushed to descend, the bottom end of the sealing ring 603 enters the lower ring groove 601, and the sealing ring 603 is pressed, and the two sides of the sealing ring 603 are made of rubber, and after being pressed, the two sides of the sealing ring 603 are expanded, and abut against the opposite inner walls of the upper ring groove 602 and the lower ring groove 601, and the motor two 705 are closed, so that the sealing performance between the cover 103 and the main body 101 is improved; when the cover 103 needs to be opened, the motors 705 are started, the internal thread pipe sleeves 704 are driven to rotate in the opposite directions, the screws 703 move towards the direction close to the motors 705, the lifting frame 701 is driven to ascend until the sealing rings 603 are completely separated from the lower ring groove 601, the motors 705 are closed, the operation of the motors 303 is prevented, and when the cover 508 is driven to move horizontally, the sealing rings 603 are cut off by shearing force generated between the machine body 1 and the cover 508 which move relatively.

Example 6:

as shown in fig. 8 and fig. 9, in this embodiment, a BOPA film manufacturing process is further disclosed, which is characterized by including the following steps:

s1, uniformly mixing the raw materials, putting the mixture into an extrusion device for melt extrusion and sheet casting, wherein the sheet casting temperature is 26 ℃;

s2, scanning the thickness of the cast piece by using a non-contact thickness gauge;

s3, preprocessing after primary thickness measurement;

s4, synchronously stretching at the stretching temperature of 180-210 ℃;

s5, trimming and recycling the side edges;

s6, carrying out corona treatment after secondary thickness measurement;

s7, winding, cutting and warehousing;

wherein, the raw materials comprise the following components by weight percent:

component 1: 80-92% of PA6 (polyamide-6), 2-3% of smooth master batch, 2-5% of antioxidant master batch, 1.5-5% of antistatic master batch and 2.5-5% of impact resistant master batch;

or comprises the following steps:

component 1: 80-90% of PA6 (polyamide-6), 1-3% of smooth master batch, 3-5% of antioxidant master batch, 0.5-2% of antistatic master batch, 3-5% of open master batch, 0.5-2% of dispersing master batch and 2-3% of antibacterial master batch.

In this example of the application, the BOPA prepared by the formulation of component 1 is used as an aluminum plastic film due to the above method, and its performance parameters are: the thickness deviation is +/-6%, the average thickness deviation is +/-2%, the longitudinal tensile strength is more than or equal to 280MPa, the transverse tensile strength is more than or equal to 280MPa, the longitudinal heat shrinkage rate is less than or equal to 2.0%, the transverse heat shrinkage rate is less than or equal to 1.5%, and the haze is less than or equal to 10, the BOPA prepared by the formula of the component 2 is used as a medical medicine bag, and the performance parameters are as follows: the thickness deviation is +/-6%, the average thickness deviation is +/-2%, the longitudinal tensile strength is more than or equal to 220MPa, the transverse tensile strength is more than or equal to 220MPa, the longitudinal heat shrinkage rate is less than or equal to 2.0%, the transverse heat shrinkage rate is less than or equal to 2.0%, the haze is less than or equal to 4.0%, the balance of the product can be influenced by the thickness deviation and the average thickness deviation, and the impact resistance and the ductility can be directly influenced by the tensile strength. The tensile strength and the heat shrinkage rate are in direct proportion, the haze can be adjusted through process parameters, and the performances are not affected mutually.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one of 8230, and" comprising 8230does not exclude the presence of additional like elements in a process, method, article, or apparatus comprising the element. Further, it should be noted that the scope of the methods and apparatus of the embodiments of the present application is not limited to performing the functions in the order illustrated or discussed, but may include performing the functions in a substantially simultaneous manner or in a reverse order based on the functions involved, e.g., the methods described may be performed in an order different than that described, and various steps may be added, omitted, or combined. In addition, features described with reference to certain examples may be combined in other examples.

While the present embodiments have been described with reference to the accompanying drawings, it is to be understood that the invention is not limited to the precise embodiments described above, which are meant to be illustrative and not restrictive, and that various changes may be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (10)

1. The utility model provides an extrusion device for BOPA membrane preparation, includes organism (1), feed chute (8), bin outlet (9), heater and through motor drive's extrusion screw (10), its characterized in that, organism (1) includes:

a main body (101) provided with a notch (102) at the top;

a cover (103) openably and closably mounted on the body (101) for closing the slot (102);

the opening and closing mechanism is used for controlling the opening and closing of the cover (103);

wherein the feed chute (8) is mounted on top of the cover (103).

2. The extrusion device for BOPA film production according to claim 1, wherein the opening and closing mechanism comprises:

a connecting unit (2) for movably mounting the cover (103) on the top of the body (101);

a pushing unit (3) which is used for matching with the connecting unit (2) and driving the cover (103) to move towards the discharge opening (9) and turn over the cover by taking the connecting unit (2) as a base point;

a locking unit (4) for fixing the end of the cover (103) remote from the discharge opening (9) when the cover (103) closes the slot (102).

3. The extrusion apparatus for BOPA film production according to claim 2, wherein the connection unit (2) comprises:

a pair of lapping edges (201) which are respectively and integrally formed at the bottom of the outer side wall of the cover (103) and the top of the outer side wall of the main body (101);

a side plate (202) which is integrally formed and arranged on the outer side wall of the upper side lap edge (201) and extends downwards, and the inner side wall is abutted with the outer side wall of the lower side lap edge (201);

the guide groove (203) is arranged at the end, far away from the feed groove (8), of the side plate (202);

a support groove (204) provided on the side plate (202) between the guide groove (203) and the discharge opening (9);

and the pair of transmission columns (205) are respectively installed in the guide groove (203) and the support groove (204) in a sliding manner.

4. The extrusion apparatus for BOPA film production according to claim 3, wherein the pushing unit (3) comprises:

the lead screw (301) is rotatably arranged on one side of the main body (101) and is driven by a first motor (303);

the transmission screw sleeve (302) is mounted on the lead screw (301) in a transmission manner;

one end of the linkage swing arm (304) is hinged with the transmission threaded sleeve (302), and the other end of the linkage swing arm is hinged with the side plate (202);

the lead screw (301) and the lap edge (201) are arranged in parallel, and the guide groove (203), the support groove (204) and the pair of transmission columns (205) are located between the linkage swing arm (304) and the discharge opening (9).

5. The extrusion apparatus for BOPA film production according to claim 4, wherein the locking unit (4) comprises:

a lock plate (401) provided at an end of the side plate (202) away from the guide groove (203);

a locking groove (402) provided on an inner side wall of the locking plate (401);

a telescopic groove (403) which is arranged on the outer side wall of the main body (101) and corresponds to the locking groove (402);

the locking sliding block (404) is movably arranged in the telescopic groove (403), and the outer end of the locking sliding block can be clamped with the locking groove (402);

the first spring (405) is installed between the locking sliding block (404) and the telescopic groove (403);

a resetting piece (5) comprising a pull rod (510) for retracting the outer end of the locking slide block (404) into the telescopic groove (403).

6. The extrusion apparatus for BOPA film production according to claim 5, wherein the reset member (5) comprises:

an outer sliding groove (501) which communicates the outer side wall of the main body (101) with the telescopic groove (403);

an inner chute (502) provided on an inner side wall of the telescopic chute (403);

a linkage groove (503) which is arranged on the side wall of the locking slide block (404), corresponds to the inner sliding groove (502), and has an inclined inner end surface;

the transverse through groove (504) is communicated with the outer side wall, far away from the inner sliding groove (502), of the locking sliding block (404) and the linkage groove (503);

and the linkage block (505) is slidably arranged in the inner chute (502) and is fixedly connected with the inner end of the pull rod (510).

7. The extrusion apparatus for BOPA film production according to claim 6, wherein the reset member (5) further comprises:

the clamping sliding block (506) is fixedly arranged on the outer wall of the pull rod (510) and is in sliding fit with the outer sliding groove (501);

the clamping groove (507) is arranged on the side wall of the locking sliding block (404) facing the outward sliding groove (501) and is used for clamping and matching with the clamping sliding block (506);

the cover plate (508) is fixedly arranged at the outer end of the outer sliding chute (501) through a fastener;

and two ends of the second spring (509) are respectively abutted against the opposite sides of the cover plate (508) and the clamping slide block (506).

8. The extrusion device for BOPA film production according to claim 3, further comprising:

a lower ring groove (601) including a pair of straight portions and a pair of arc portions;

an upper ring groove (602) provided on a bottom surface of the cover (103);

a seal ring (603) movably mounted in the lower ring groove (601) and the upper ring groove (602);

and the lifting driving unit (7) is used for controlling the sealing ring (603) to lift between the upper ring groove (602) and the lower ring groove (601).

9. The extrusion apparatus for BOPA film production according to claim 8, wherein the elevation driving unit (7) comprises:

the lifting frame (701) is fixedly arranged on the top surface of the sealing ring (603) through viscose;

the vertical through grooves (702) are arranged at the edge of the top surface of the cover (103) at intervals;

the plurality of screws (703) are fixedly installed at the top of the lifting frame (701) through welding and are respectively inserted into the vertical through grooves (702);

and the internal thread pipe sleeves (704) are respectively in transmission connection with the screw rods (703) and are driven to rotate by a second motor (705).

10. A process for preparing an extrusion device suitable for the preparation of BOPA film according to any of claims 1 to 9, comprising the steps of:

s1, uniformly mixing raw materials, putting the raw materials into an extrusion device for melt extrusion and sheet casting, wherein the temperature of a cast sheet is 26 ℃;

s2, scanning the thickness of the cast piece by using a non-contact thickness gauge;

s3, preprocessing after primary thickness measurement;

s4, synchronously stretching at the stretching temperature of 180-210 ℃;

s5, trimming and recycling the side edges;

s6, performing corona treatment after secondary thickness measurement;

s7, winding, cutting and warehousing;

wherein the raw materials comprise the following components in percentage by weight:

component 1: 80-92% of PA6 (polyamide-6), 2-3% of smooth master batch, 2-5% of antioxidant master batch, 1.5-5% of antistatic master batch and 2.5-5% of impact resistant master batch;

or comprises the following steps:

80-90% of PA6 (polyamide-6), 1-3% of smooth master batch, 3-5% of antioxidant master batch, 0.5-2% of antistatic master batch, 3-5% of open master batch, 0.5-2% of dispersing master batch and 2-3% of antibacterial master batch.

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