阅读说明：本技术 一种bopp包装膜的制备及其生产工艺 (Preparation and production process of BOPP packaging film ) 是由 孙伟 徐鹏 于 2021-08-03 设计创作，主要内容包括：本发明涉及BOPP薄膜制造技术领域,且公开了一种BOPP包装膜的制备及其生产工艺,包括定位底座、电机、厚片、剥离辊、挤出模头、气刀,所述定位底座的上活动套接有中心辊,所述中心辊外固定套接有活动辊,所述中心辊的顶部固定套接有进水管,所述进水管的顶端固定连接有布水管。本发明通过设计的弹性胶层、空腔、挤压板、弹簧,使冷却腔中的冷却水在向下流动并吸收厚片热量导致温度上升时,使弹性胶层软化、空腔内气体热涨,从而使挤压板上抬,弹性胶层涨大,使涨大区域的冷却腔空隙变小,从而使冷却水流速加快,单位时间内带走更多的热量,使冷却腔的顶部与底部进行自调节,从而使厚片各处受到的冷却效果均匀。(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.)

1. The utility model provides a preparation facilities of BOPP packaging film, includes location base (1), motor (3), slab (19), peel roller (20), extrusion die (21), air knife (22), its characterized in that: the last activity of location base (1) has cup jointed central roller (2), the outer fixed cover of central roller (2) has cup jointed activity roller (7), the fixed inlet tube (9) that has cup jointed in top of central roller (2), the top fixedly connected with water distributor (10) of inlet tube (9), the water sprayhead (11) of the top fixedly connected with equipartition of water distributor (10), the bottom fixed cup joint of central roller (2) has outlet pipe (12), the bottom fixedly connected with collector pipe (13) of outlet pipe (12), the bottom fixedly connected with suction head (14) of collector pipe (13), the partition layer (151) of the one end fixed connection equipartition of activity roller (7), adjacent four the top fixed connection of partition layer (151) has elastic glue layer (15), elastic partition layer (15) and elastic glue layer (151) form the cavity (16) of equipartition, the bottom fixedly connected with spring (18) of cavity (16), the top fixedly connected with stripper plate (17) of spring (18), the top of stripper plate (17) and the bottom fixed connection of elasticity glue film (15), the output end fixedly connected with driving gear (4) of motor (3), driving gear (4) meshing has driven gear roller (5), the one end fixedly connected with chill roll (6) of driven gear roller (5), the outside at activity roller (7) is cup jointed in the activity of chill roll (6), clearance between chill roll (6) and activity roller (7) forms cooling chamber (8).

2. The apparatus for preparing BOPP packaging film as claimed in claim 1, wherein: 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), and the weight of the water suction heads (14) is one to five times that of the water spraying nozzles (11).

3. The apparatus for preparing BOPP packaging film as claimed in claim 1, wherein: 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.

4. The apparatus for preparing BOPP packaging film as claimed in claim 1, wherein: saturated air is filled in the cavities (16), two cavities (16) which are farthest away on the same straight line are respectively close to one end of the cooling cavity (8), and the cavities (16) are arranged in an arc shape on the cross section.

5. 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).

6. The apparatus for preparing BOPP packaging film as claimed in claim 1, wherein: the water spray nozzles (11) and the water suction heads (14) are both positioned in the cooling cavity (8), and the two water spray nozzles (11) which are farthest away and the two water suction heads (14) which are farthest away are both close to two ends of the cooling cavity (8).

7. 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 the cooling cavity (8) through the water spray nozzle (11), and discharging the cooling water from the water suction head (14);

s2, starting the motor (3) to rotate the chill 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 heated to expand, 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 to be arranged in a step shape;

s5, the step formed by the impact of cooling water enables the movable roller (7) to rotate, and the elastic glue layer (15) in each area has the change of the expansion degree again according to the temperature change;

s6, taking away the cooled thick sheet (19) after contacting the stripping roller (20), and keeping the chill roller (6) 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 and transversely stretched, 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 (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.

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, the inside condenser tube of chill roll is adopted mostly to carry out the heat transfer cooling, 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 direction 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 crystallinity of slab simultaneously, great difference exists in the grain thickness, this can influence final finished product's quality, and follow-up tensile process appears drawing 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: a preparation device of a BOPP packaging film comprises a positioning base, a motor, a thick sheet, a stripping roller, an extrusion die head and an air knife, wherein a center roller is sleeved on the upper part of the positioning base in a movable manner, a movable roller is sleeved outside the center roller in a fixed manner, a water inlet pipe is fixedly sleeved at the top of the center roller, a water distribution pipe is fixedly connected at the top end of the water inlet pipe, uniformly distributed water spray nozzles are fixedly connected at the top end of the water distribution pipe, a water outlet pipe is fixedly sleeved at the bottom of the center roller, a water collecting pipe is fixedly connected at the bottom end of the water outlet pipe, a water suction head is fixedly connected at the bottom end of the water collecting pipe, one end of the movable roller is fixedly connected with uniformly distributed partition layers, the top parts of the four adjacent partition layers are fixedly connected with elastic glue layers, the elastic glue layers and the partition layers form uniformly distributed cavities, springs are fixedly connected at the bottom ends of the cavities, and extrusion plates are fixedly connected at the top ends of the springs, the top of stripper plate and the bottom fixed connection of elasticity glue film, the output fixedly connected with driving gear of motor, the driving gear meshing has the driven gear roller, the one end fixedly connected with chill roll of driven gear roller, the chill roll activity cup joints the outside at the activity roller, the clearance between chill roll and the activity 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 the cooling cavity through a water spray nozzle, and discharging the cooling water from the 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, blowing the casting body by an air knife, and attaching the casting body to the surface of a chill roll;

s4, when 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, enabling the movable roller to rotate by the step formed by the impact of cooling water, and enabling the elastic glue layer in each area to have the expansion degree change again according to the temperature change;

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

s7, the stripping roller drives the thick sheet to move forward to the stretching device, so that the thick sheet is longitudinally and transversely stretched, 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 chill roll, the movable roll and the cooling cavity, the water spray nozzle can spray cooling water from the top of the cooling cavity all the time, so that the sprayed cooling water can be radiated to the whole chill roll, thereby avoiding the problem of uneven cooling of the left end and the right end of a thick sheet, and meanwhile, through the way of shunting the cooling water, the cooling water can not only rapidly cool the thick sheet, but also rapidly pre-cool the chill roll, thereby improving the cooling effect of the thick sheet initially clinging to the chill roll, and avoiding the problems of necking and tilting.

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 structural view 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 shown in FIG. 2;

FIG. 4 is a schematic view of a structure of a partition layer 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 glue 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 derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within 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 suction head 14 is always positioned at the bottom of the cooling chamber 8, the water spray nozzle 11 is always positioned at the top of the cooling chamber 8, so that after the 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, so that one water flow uniformly cools the thick sheet, the other water flow precools the chilling roller 6, make simultaneously movable roller 7 when rotating, can receive the gravity influence of suction head 14 to and rivers impact the influence to the ladder that elastic glue layer 15, stripper plate 17 formed, carry out the incessant rotation of self-regulation, make the thick piece in each department can receive even cooling effect always, the equal fixedly connected with of one end of inlet tube 9 and outlet pipe 12 has movable ring 23, movable ring 23 and circulative cooling system's pipeline activity joint, when making movable roller 7 carry out the self-regulation, its rotation can not influence the cooling water of inlet tube 9 and outlet pipe 12 and carry.

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 the four adjacent partition layers 151 are fixedly connected with the elastic adhesive layer 15, the elastic adhesive 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 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 sheets 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 adhesive layer 15 is extruded by the thermally expanded air, the cavities 16 are arranged in an arc shape on the cross section, the heat absorbed by the cavities 16 can generate step change according to the temperature change of the thick sheets 19, the subsequent elastic adhesive layer 15 and the extrusion plates 17 are arranged in a step shape, 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 end of the extrusion plate 17 is fixedly connected with the bottom end of the elastic glue layer 15, the elastic force of the elastic glue layer 15 is one-fifth times of the elastic force of the spring 18, when the cooling water is not heated, the elastic glue layer 15 can be kept in an original state and is inconvenient, after the cooling water is heated, the elastic glue layer 15 is heated and softened, meanwhile, the elastic glue layer is expanded under the elastic force of the spring 18 and the extrusion force of hot expanding air, a bulge is formed under the extrusion of the extrusion plate 17, and finally step arrangement is formed.

Referring to fig. 1, the output end of the motor 3 is fixedly connected with a driving gear 4, the driving gear 4 is meshed 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 in 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 two ends of the cooling cavity 8, so that all parts of the 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 differences of crystallinity and 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 the cooling cavity 8 through the water spray nozzle 11, and discharging the cooling water from the water suction head 14;

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

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

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

s5, the step formed by the impact of the cooling water enables the movable roller 7 to rotate, and the expansion degree of the elastic glue layer 15 in each area changes again according to the temperature change;

s6, taking away the cooled thick sheet 19 after contacting the stripping roller 20, and keeping the chill roller 6 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 and transversely pulled, and the material on the surface of the film is added 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 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 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, discharging the water streams to the circulating cooling system from a water outlet pipe 12 after being sucked into a water collecting pipe 13 by a water suction head 14, 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 be subjected to heat exchange with the cooling water in the cooling cavity 8 to 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 temperature is gradually raised under the influence of heat exchange, so that 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, so that the elastic glue layer 15 is expanded, at the moment, the cooling water flowing through the elastic glue layer 15 with different expansion degrees correspondingly increases the flow rate, at the same time, the elastic glue layer 15 with the same expansion degree forms steps under the influence of the temperature, so that the cooling water impacts each step, the movable roller 7 is forced 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, at the moment, the cooling water is influenced by gravity, more amount of the cooling water flows counterclockwise, the cooling water in the clockwise direction is reduced, at the moment, each elastic glue layer 15 is added with the cooling water and the position is changed, the degree of expansion changes again;

finally, the thick sheet is taken away by the stripping roller 20 when contacting the stripping 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 a new thick sheet again, meanwhile, after the cooling water in the anticlockwise direction enables the cooling effect of each part 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 is noted that, herein, relational terms such as first and second, and the like may be 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 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.