CN113635531B - Preparation and production process of BOPP packaging film - Google Patents

Abstract

The invention relates to the technical field of BOPP film manufacturing, and discloses a preparation method and a production process of a BOPP packaging film. According to the invention, through the designed elastic glue layer, the cavity, the extrusion plate and the spring, when cooling water in the cooling cavity flows downwards and absorbs heat of the thick sheet to cause temperature rise, the elastic glue layer is softened, and gas in the cavity is expanded thermally, so that the extrusion plate is lifted, the elastic glue layer is expanded, and gaps of the cooling cavity in an expanded area are reduced, so that the flow rate of the cooling water is accelerated, more heat is taken away in unit time, the top and the bottom of the cooling cavity are self-regulated, and the cooling effect on each part of the thick sheet is uniform.

Description

Preparation and production process of BOPP packaging film

Technical Field

The invention relates to the technical field of BOPP film manufacturing, in particular to a preparation method and a production process of a BOPP packaging film.

Background

The cast sheet made of the BOPP film means that molten high-molecular polypropylene is forced to pass through a long and narrow die under the pushing of pressure to form a viscous BOPP melt, the viscous BOPP melt is rapidly attached to a chill roll under the strong blowing of an air knife, and the viscous BOPP melt is forcedly cooled and vitrified by the chill roll to form a thick sheet with uniform thickness.

The cooling of current chill roll, adopt the inside condenser tube of chill roll to carry out the heat transfer cooling mostly, but because the length of chill roll and the width of slab are great, the cooling water that gets into from the water inlet is under the heat transfer through the front end slab, make the cooling water temperature of delivery port orientation be greater than the cooling water temperature of water inlet, this cooling that will lead to the slab is inhomogeneous, arouse the perk and the necking phenomenon of high temperature side slab easily, can make the degree of crystallinity of slab simultaneously, there is great difference in the grain thickness, this can influence final off-the-shelf quality, and follow-up tensile process appears stretching inhomogeneous problem.

Disclosure of Invention

The invention provides a preparation method and a production process of a BOPP packaging film, aiming at the defects of the existing BOPP film manufacturing cast chilling roller in the use process, which are provided in the background technology.

The invention provides the following technical scheme: the utility model provides a preparation facilities of BOPP packaging film, includes location base, motor, slab, peel roll, extrusion die, air knife, the center roller has been cup jointed in the last activity of location base, the movable roller has been cup jointed to the center roller external fixation, the fixed inlet tube that has cup jointed in top of center roller, the top fixedly connected with water distributor of inlet tube, the water spray nozzle of the top fixedly connected with equipartition of water distributor, the fixed outlet pipe that has cup jointed in bottom of center roller, the bottom fixedly connected with collector pipe of outlet pipe, the bottom fixedly connected with suction head of collector pipe, the partition layer of the one end fixed connection equipartition of movable roll, adjacent four the top fixedly connected with elastic glue layer on partition layer, elastic glue layer and partition layer form the cavity of equipartition, the bottom fixedly connected with spring of cavity, the top fixedly connected with stripper plate of spring, the top of stripper plate and elastic glue layer's bottom fixed connection, the output fixedly connected with driving gear of motor, the driving gear meshing has driven gear roller, the one end fixedly connected with chill roll of driven gear roller, the chill roll activity is in the outside of chill roll cup joints, clearance between chill roll and the movable roller forms the cooling chamber.

Preferably, the water distribution pipe is fixedly sleeved on the top of the movable roller, the water spray nozzle penetrates through the top of the movable roller, the water collection pipe is fixedly sleeved on the bottom of the movable roller, the water suction head penetrates through the bottom of the movable roller, and the weight of the water suction head is one to five times that of the water spray nozzle.

Preferably, the one end of inlet tube and outlet pipe is equal fixedly connected with activity ring, activity ring and circulative cooling system's pipeline activity joint.

Preferably, the cavities are filled with saturated air, two cavities which are farthest away on the same straight line are respectively close to one end of the cooling cavity, and the cavities are arranged in an arc shape on the cross section.

Preferably, the elastic force of the elastic glue layer is one fifth of the elastic force of the spring.

Preferably, the water spray nozzles and the water suction heads are both located in the cooling cavity, and the two water spray nozzles which are farthest away and the two water suction heads which are farthest away are both close to two ends of the cooling cavity.

The production process for preparing the BOPP packaging film comprises the following steps:

s1, starting a circulating cooling system, spraying cooling water into a cooling cavity through a water spray nozzle, and discharging the cooling water from a water suction head;

s2, starting a motor to rotate the chilling roller;

s3, extruding a BOPP packaging film casting body by an extrusion die head, and blowing the casting body by an air knife to enable the casting body to be attached to the surface of a chilling roller;

s4, after the cooling water gradually moves downwards to exchange heat, the temperature is increased, so that the air in the cavity is thermally expanded, the elastic adhesive layer is softened, the spring drives the extrusion plate to jack the elastic adhesive layer, and the elastic adhesive layers in all the areas are expanded and arranged in a step shape;

s5, the movable roller is rotated by the step formed by the impact of cooling water, and the expansion degree of the elastic adhesive layer of each area is changed again according to the temperature change;

s6, taking away the cooled thick sheet after contacting the stripping roller, and keeping the chilling roller to rotate continuously;

s7, the stripping roller drives the thick sheet to move forward to the stretching device, so that the thick sheet is longitudinally pulled and transversely pulled, and the material on the surface of the film is added to form the BOPP packaging film;

s8, trimming the BOPP packaging film, testing the thickness of the BOPP packaging film, and feeding the thickness back to a control system of the extrusion die head;

s9, drawing the BOPP packaging film, then carrying out electric quantity treatment and finishing winding, and then putting the BOPP packaging film into an aging treatment device;

and S10, cutting, inspecting and packaging the processed BOPP packaging film to obtain a finished product.

The invention has the following beneficial effects:

1. according to the invention, through the designed water spray nozzle, the water suction head, the chilling roller, the movable roller and the cooling cavity, the water spray nozzle is enabled to spray cooling water from the top of the cooling cavity all the time, and the sprayed cooling water can be radiated to the whole chilling roller, so that the problem of uneven cooling of the left end and the right end of a thick sheet is avoided.

2. According to the invention, through the designed elastic glue layer, the cavity, the extrusion plate and the spring, when cooling water in the cooling cavity flows downwards and absorbs heat of the thick sheet to cause temperature rise, the elastic glue layer is softened, and gas in the cavity is expanded thermally, so that the extrusion plate is lifted, the elastic glue layer is expanded, and gaps of the cooling cavity in an expanded area are reduced, so that the flow rate of the cooling water is accelerated, more heat is taken away in unit time, the top and the bottom of the cooling cavity are self-regulated, and the cooling effect on each part of the thick sheet is uniform.

3. According to the invention, through the designed elastic glue layer, the cavity, the extrusion plate, the spring, the water inlet pipe and the water outlet pipe, when the elastic glue layer expands, the elastic glue layer can form a step shape under the action of the extrusion plate, so that flowing cooling water impacts the extrusion plate under the action of gravity and subsequent water pressure, the movable roller rotates, the position of the water spray nozzle is changed, the water spray nozzle is closer to the initial position of the thick plate, more cooling water flows towards the initial position direction of the thick plate, the flowing speed and the heat exchange effect of the cooling water are accelerated, and under the condition that the elastic glue layer expands, the cooling effect of each part can still reach a uniform state through self-adjustment.

Drawings

FIG. 1 is a schematic view of the structure of the present invention;

FIG. 2 is a schematic view of the cavity structure of the present invention;

FIG. 3 is an enlarged view of a portion of the structure A of FIG. 2 according to the present invention;

FIG. 4 is a schematic view of a partition layer structure according to the present invention.

In the figure: 1. positioning a base; 2. a center roller; 3. a motor; 4. a driving gear; 5. a driven gear roll; 6. a chill roll; 7. a movable roller; 8. a cooling chamber; 9. a water inlet pipe; 10. a water distribution pipe; 11. a water spray nozzle; 12. a water outlet pipe; 13. a water collection pipe; 14. a suction head; 15. an elastic adhesive layer; 151. a partition layer; 16. a cavity; 17. a pressing plate; 18. a spring; 19. thick plate; 20. a peeling roller; 21. an extrusion die head; 22. an air knife; 23. a movable ring.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.

Referring to fig. 1-2, a BOPP packaging film manufacturing apparatus includes a positioning base 1, a motor 3, a thick sheet 19, a peeling roller 20, an extrusion die 21, and an air knife 22, wherein the positioning base 1 is movably sleeved with a central roller 2, the central roller 2 is fixedly sleeved with a movable roller 7, the top of the central roller 2 is fixedly sleeved with a water inlet pipe 9, the top of the water inlet pipe 9 is fixedly connected with a water distribution pipe 10, the top of the water distribution pipe 10 is fixedly connected with uniformly distributed water spray nozzles 11, the water distribution pipe 10 is fixedly sleeved on the top of the movable roller 7, the water spray nozzles 11 penetrate the top of the movable roller 7, the bottom of the central roller 2 is fixedly sleeved with a water outlet pipe 12, the bottom of the water outlet pipe 12 is fixedly connected with a water collecting pipe 13, the bottom of the water collecting pipe 13 is fixedly connected with a water suction head 14, the water collecting pipe 13 is fixedly sleeved on the bottom of the movable roller 7, the water suction head 14 penetrates the bottom of the movable roller 7, the weight of the water suction head 14 is five times of the weight of the water spray nozzles 11, the water suction head 14 is always positioned at the bottom of the cooling cavity 8, the water spray nozzle 11 is always positioned at the top of the cooling cavity 8, so that after cooling water is sprayed out from the water spray nozzle 11, two water flows in the clockwise direction and the anticlockwise direction can be formed at the top of the cooling cavity 8, one water flow can uniformly cool the thick sheet, the other water flow can pre-cool the chill roll 6, meanwhile, the movable roll 7 can be influenced by the gravity of the water suction head 14 when rotating, and the step impact influence formed by the water flow on the elastic rubber layer 15 and the extrusion plate 17 can be realized, the self-adjusting uninterrupted rotation can be realized, the thick sheet at each position can always be subjected to the uniform cooling effect, one ends of the water inlet pipe 9 and the water outlet pipe 12 are fixedly connected with the movable ring 23, the movable ring 23 is movably clamped with a pipeline of a circulating cooling system, so that when the movable roll 7 is self-adjusting, the rotation of which does not affect the cooling water delivery of the inlet pipe 9 and the outlet pipe 12.

Referring to fig. 2-4, one end of the movable roller 7 is fixedly connected with the partition layers 151 which are uniformly distributed, the tops of four adjacent partition layers 151 are fixedly connected with the elastic glue layer 15, the elastic glue layer 15 and the partition layers 151 form uniformly distributed cavities 16, saturated air is filled in the cavities 16, two cavities 16 which are farthest away from each other on the same straight line are respectively close to one end of the cooling cavity 8, so that the cavities 16 can affect the thick plates 19 at each position, the heated cooling water can affect the cavities 16, the saturated air in the cavities 16 is thermally expanded, the elastic glue layer 15 is extruded by the thermally expanded air, the cavities 16 are arranged in an arc shape on the cross section, heat absorbed by the cavities 16 can generate step change according to the temperature change of the thick plates 19, the subsequent elastic glue layer 15 and the extrusion plates 17 form step-shaped arrangement, the bottom ends of the cavities 16 are fixedly connected with springs 18, the top ends of the springs 18 are fixedly connected with the extrusion plates 17, the top ends of the extrusion plates 17 are fixedly connected with the bottom ends of the elastic glue layer 15, the elastic glue layer 15 is five times of the elasticity of the springs 18, when the temperature of the cooling water is not raised, the elastic glue layer 15 is heated, the elastic glue layer is heated, and the extrusion plates form a softened extrusion plates, and the extrusion plates 17, and the extrusion plates are finally extruded springs are extruded springs.

Referring to fig. 1, the output end of the motor 3 is fixedly connected with a driving gear 4, the driving gear 4 is engaged with a driven gear roller 5, one end of the driven gear roller 5 is fixedly connected with a chill roller 6, the chill roller 6 is movably sleeved outside a movable roller 7, a cooling cavity 8 is formed by a gap between the chill roller 6 and the movable roller 7, a water spray nozzle 11 and a water suction head 14 are both positioned in the cooling cavity 8, and the two water spray nozzles 11 which are farthest away from each other and the two water suction heads 14 which are farthest away from each other are both close to the two ends of the cooling cavity 8, so that each part of a thick sheet 19 on the same straight line can be cooled by the same cooling water, the warping and necking phenomena caused by uneven cooling are avoided, and the crystallinity and the difference of the thickness of crystal grains are reduced.

A production process for preparing a BOPP packaging film comprises the following steps:

s1, starting a circulating cooling system, spraying cooling water into a cooling cavity 8 through a water spray nozzle 11, and discharging the cooling water from a water suction head 14;

s2, starting the motor 3 to rotate the chilling roller 6;

s3, extruding a BOPP packaging film casting body by an extrusion die head 21, blowing the casting body by an air knife 22, and attaching the casting body to the surface of a chill roll 6;

s4, after the cooling water gradually moves downwards to exchange heat, the temperature is increased, so that the air in the cavity 16 is thermally expanded, the elastic adhesive layer 15 is softened, the spring 18 drives the extrusion plate 17 to jack up the elastic adhesive layer, and the elastic adhesive layers 15 in all the areas are expanded and arranged in a step shape;

s5, the cooling water impacts the formed ladder to enable the movable roller 7 to rotate, and the elastic adhesive layer 15 in each area changes in expansion degree again according to temperature change;

s6, the cooled thick sheet 19 is brought away by the stripping roller 20 after contacting the stripping roller, and the chill roller 6 keeps rotating continuously;

s7, the stripping roller 20 drives the thick sheet 19 to move forward to the stretching device, so that the thick sheet 19 is longitudinally pulled, transversely pulled and subjected to film surface material adding treatment to form the BOPP packaging film;

s8, performing edge cutting treatment on the BOPP packaging film, testing the thickness of the BOPP packaging film, and feeding back the thickness to a control system of the extrusion die head 21;

s9, drawing the BOPP packaging film, then carrying out electric quantity treatment and finishing rolling, and then putting the BOPP packaging film into an aging treatment device;

and S10, slitting, inspecting and packaging the processed BOPP packaging film to obtain a finished product.

The use method (working principle) of the invention is as follows:

firstly, starting a circulating cooling system, enabling cooling water to enter a water distribution pipe 10 from a water inlet pipe 9 and spray into a cooling cavity 8 from a water spray nozzle 11, enabling the cooling water to be divided into two streams of water in clockwise and anticlockwise directions, finally converging the water streams at the bottom of the cooling cavity 8, sucking the water streams into a water collecting pipe 13 by a water suction head 14, then discharging the water streams to the circulating cooling system from a water outlet pipe 12, simultaneously starting a motor 3, enabling a driving gear 4 to drive a driven gear roller 5 to rotate, enabling a chill roller 6 to rotate, enabling an extrusion die head 21 to start extruding a BOPP packaging film casting body, enabling the casting body to be attached to the surface of the chill roller 6 and rotate synchronously along with the rotation of the chill roller 6 under the blowing of an air knife 22, and enabling the casting body to generate heat with the cooling water in the cooling cavity 8 to exchange heat and gradually form a thick sheet;

then, in the process that the cooling water in the cooling cavity 8 flows from the top to the bottom, the cooling water is influenced by heat exchange, the temperature is gradually increased, the elastic glue layer 15 is softened, the gas in the cavity 16 is expanded, the spring 18 drives the extrusion plate 17 to extrude the elastic glue layer 15, the elastic glue layer 15 is expanded, the cooling water flowing through the elastic glue layer 15 with different expansion degrees at the moment is correspondingly increased in flow speed, meanwhile, the elastic glue layer 15 with the same expansion degree is stepped under the influence of the temperature, the cooling water impacts each step, the movable roller 7 is stressed to rotate, the water spray nozzle 11 rotates counterclockwise and is close to the initial position of the thick sheet, the water suction head 14 rotates counterclockwise and is far away from the bottom, the cooling water is influenced by gravity, a larger amount of the cooling water flows counterclockwise, the cooling water in the clockwise direction is reduced, and the expansion degree of each elastic glue layer 15 is changed again under the addition of the cooling water and the change of the position;

finally, the thick sheet is taken away by the peeling roller 20 when contacting with the peeling roller 20, the position of the chill roller 6 losing the thick sheet is pre-cooled under the influence of cooling water in the clockwise direction, and contacts with a new thick sheet again, meanwhile, after the cooling water in the counterclockwise direction enables the cooling effect at each position to be in a balanced state, the expansion degree of the elastic adhesive layer 15 is reduced, the height of the step formed by the elastic adhesive layer 15 and the extrusion plate 17 is reduced, the stress of the movable roller 7 is reduced, at the moment, under the action of gravity, the water suction head 14 rotates towards the bottom of the cooling cavity 8, and the water spray nozzle 11 rotates towards the top of the cooling cavity 8.

It should be noted that, in this document, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, 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.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (4)

1. The utility model provides a preparation facilities of BOPP packaging film, includes positioning base (1), motor (3), slab (19), peel roller (20), extrusion die (21), air knife (22), its characterized in that: the upper movable sleeve of the positioning base (1) is sleeved with a center roller (2), the outer fixed sleeve of the center roller (2) is sleeved with a movable roller (7), the top of the center roller (2) is fixedly sleeved with a water inlet pipe (9), the top of the water inlet pipe (9) is fixedly connected with a water distribution pipe (10), the top of the water distribution pipe (10) is fixedly connected with a water spray nozzle (11) uniformly distributed, the bottom of the center roller (2) is fixedly sleeved with a water outlet pipe (12), the bottom of the water outlet pipe (12) is fixedly connected with a water collection pipe (13), the bottom of the water collection pipe (13) is fixedly connected with a water suction head (14), a partition layer (151) uniformly distributed at one end of the movable roller (7) is fixedly connected with an elastic adhesive layer (15) at the top of the partition layer (151), the elastic adhesive layer (15) and the partition layer (151) form a cavity (16) uniformly distributed, the bottom of the cavity (16) is fixedly connected with a spring (18), the top of the spring (18) is fixedly connected with an extrusion plate (17), the top of the extrusion plate (17) is fixedly connected with the bottom of the elastic adhesive layer (15), the output end of the motor (3) is fixedly connected with a driven gear (4), and the driven roller (5), one end of the driven gear roller (5) is fixedly connected with a chilling roller (6), the chilling roller (6) is movably sleeved on the outer side of the movable roller (7), and a cooling cavity (8) is formed in a gap between the chilling roller (6) and the movable roller (7);

the water distribution pipe (10) is fixedly sleeved at the top of the movable roller (7), the water spraying nozzles (11) penetrate through the top of the movable roller (7), the water collecting pipe (13) is fixedly sleeved at the bottom of the movable roller (7), the water suction heads (14) penetrate through the bottom of the movable roller (7), the weight of the water suction heads (14) is one point five times of that of the water spraying nozzles (11), saturated air is filled in the cavities (16), two farthest distances on the same straight line are reserved at one end, close to the cooling cavity (8), of each cavity (16), the water spraying nozzles (11) and the water suction heads (14) are arranged in an arc shape on the cross section, and the two farthest water spraying nozzles (11) and the two farthest water suction heads (14) are close to two ends of the cooling cavity (8).

2. The preparation facilities of a BOPP packaging film of claim 1 characterized in that: the equal fixedly connected with activity ring (23) of one end of inlet tube (9) and outlet pipe (12), activity ring (23) and circulative cooling system's pipeline activity joint.

3. The apparatus for preparing BOPP packaging film as claimed in claim 1, wherein: the elasticity of the elastic glue layer (15) is one to five times of the elasticity of the spring (18).

4. A production process for preparing a BOPP packaging film is characterized by comprising the following steps:

s1, starting a circulating cooling system, spraying cooling water into a cooling cavity (8) through a water spray nozzle (11), and discharging the cooling water from a water suction head (14);

s2, starting the motor (3) to rotate the chilling roller (6);

s3, extruding a BOPP packaging film casting body by an extrusion die head (21), blowing the casting body by an air knife (22) to enable the casting body to be attached to the surface of a chill roll (6);

s4, after the cooling water gradually moves downwards to exchange heat, the temperature is increased, so that the air in the cavity (16) is thermally expanded, the elastic glue layer (15) is softened, the spring (18) drives the extrusion plate (17) to jack up the elastic glue layer, and the elastic glue layers (15) in all areas are expanded and arranged in a step shape;

s5, the movable roller (7) is rotated by the step formed by the impact of cooling water, and the elastic glue layers (15) in all the areas have the change of the expansion degree again according to the temperature change;

s6, taking away the cooled thick sheet (19) after contacting with the stripping roller (20), and continuously keeping the chilling roller (6) to rotate;

s7, the stripping roller (20) drives the thick sheet (19) to move forward to the stretching device, so that the thick sheet (19) is longitudinally and transversely pulled, and the material on the surface of the film is added to form the BOPP packaging film;

s8, trimming the BOPP packaging film, testing the thickness of the BOPP packaging film, and feeding back the thickness to a control system of the extrusion die head (21);

s9, drawing the BOPP packaging film, then carrying out electric quantity treatment and finishing winding, and then putting the BOPP packaging film into an aging treatment device;

and S10, cutting, inspecting and packaging the processed BOPP packaging film to obtain a finished product.

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