CN115257098A

CN115257098A - High-barrier composite BOPP film and processing technology thereof

Info

Publication number: CN115257098A
Application number: CN202210755775.4A
Authority: CN
Inventors: 项晓波; 王辉煌; 戴建付
Original assignee: Ruian Dongwei Plastic Co ltd
Current assignee: Ruian Dongwei Plastic Co ltd
Priority date: 2022-06-30
Filing date: 2022-06-30
Publication date: 2022-11-01
Anticipated expiration: 2042-06-30
Also published as: CN115257098B

Abstract

The invention discloses a high-barrier composite BOPP film and a processing technology thereof, belonging to the field of BOPP films, wherein the barrier property of the BOPP film is greatly improved by compounding with PVDC materials, so that the use effect is better, in addition, in the processing process, the surface of the part to be cut of the BOPP film can be adhered with edge strips which are converted from strips into layers through hot compress treatment, when the BOPP film is cut, on one hand, the gravity of the edge of the film body is effectively increased, so that the film body is not easy to adhere with a cutting knife or other objects, the formation of tearing openings caused by local adhesion is effectively avoided, on the other hand, the edge after cutting is in a colored state, the light transmission of the film body is poorer than that of the rest parts, and the clear influence can be formed by matching with light detection treatment, the probability of finding the cracks is greatly improved, the probability of the cracks on the edge of the rolled film is effectively reduced, and the use effect is improved.

Description

High-barrier composite BOPP film and processing technology thereof

Technical Field

The invention relates to the field of BOPP films, in particular to a high-barrier composite BOPP film and a processing technology thereof.

Background

BOPP films are produced by first passing a melt of high molecular polypropylene through a long and narrow head to form a sheet or thick film, then stretching the film in two perpendicular directions (longitudinal, transverse) simultaneously or in steps in a special stretching machine at a certain temperature and a set speed, and subjecting the film to appropriate cooling or heat treatment or special processing (e.g. corona, coating, etc.). Commonly used BOPP films include: common biaxially oriented polypropylene films, heat-sealing biaxially oriented polypropylene films, cigarette packaging films, biaxially oriented polypropylene pearlized films, biaxially oriented polypropylene metalized films, delustering films and the like.

Although the initiated tear strength of the BOPP film is improved after stretching, the secondary tear strength of the BOPP film is very low, so that no cut can be left on two end faces of the BOPP film, otherwise, the BOPP film is easy to tear during printing and compounding, however, when the BOPP film is cut and wound for packaging, due to static electricity, the edge of the film in a free state is easy to stick to other objects after cutting, when the sticking is released, the edge is likely to have cracks due to tearing, and is also easy to adhere to a cutting knife, when the cutting knife moves, the stress is uneven to crack, and due to the transparency and the colorlessness of the BOPP film, the cracks are difficult to find, partial cuts exist on the edge of the film which is partially rolled, and the BOPP film is easy to tear during use, and the waste of resources is high.

Disclosure of Invention

1. Technical problem to be solved

Aiming at the problems in the prior art, the invention aims to provide a high-barrier composite BOPP film and a processing technology thereof, the barrier property of the BOPP film is greatly improved through compounding with PVDC materials, the using effect is better, in addition, in the processing process, the surface of the part to be cut of the BOPP film can be adhered with edge strips which are converted into layers from strips through hot compress treatment, during cutting, on one hand, the gravity of the edge of the film body is effectively increased, the film body is not easy to adhere with a cutting knife or other objects, the formation of tearing openings caused by local adhesion is effectively avoided, on the other hand, the edge is in a colored state after cutting, the light transmission of the edge is poorer than that of the rest parts, and the clear influence can be formed by matching with light detection treatment, the probability that the cracks are found is greatly improved, the probability that the cracks exist on the edge of the rolled film is effectively reduced, and the using effect is improved.

2. Technical scheme

In order to solve the above problems, the present invention adopts the following technical solutions.

The utility model provides a high resistant separates compound BOPP film, includes the film body, the equal hot-pressing veneer in both upper ends has the layer of protecting the limit about the film body, the film body from the top down includes outer rete, interior intermediate layer and the interior rete that compounds each other in proper order, protect the limit layer include with interior rete and bond the outer melten gel layer at interior rete upper surface, outer melten gel layer runs through interior rete and bonds through hot-pressing with outer rete upper surface, the one side colorless transparent that the layer of protecting the limit is close to the edge, the part that the layer of protecting the limit kept away from the edge presents coloured state.

Further, the outer melt adhesive layer is made of a hot melt material, the hot melt temperature of the outer melt adhesive layer is lower than that of the film body, and the hot melt temperature difference of the outer melt adhesive layer and the film body is not less than 20 ℃.

Further, the inner interlayer is a biaxially oriented polypropylene film material, the outer film layer and the inner film layer are both made of PVDC materials, and PVDC is one of homopolymerized polyvinylidene chloride, methyl acrylate-polyvinylidene chloride copolymer and vinyl chloride-polyvinylidene chloride copolymer.

A processing technology of a high-barrier composite BOPP film comprises the following steps:

s1, respectively hot-melting high-molecular polypropylene and PVDC materials, co-extruding the melts of the high-molecular polypropylene and the PVDC materials through a co-extrusion die head, and cutting to form a sheet;

s2, performing bidirectional stretching on the sheet through a special stretcher, and cooling to obtain a film body;

s3, carrying out hot compress treatment on the part of the film body needing to be cut, and then carrying out cutting operation at the hot compress position;

and S4, performing optical inspection treatment on the edge of the cut film body, and winding, packaging and warehousing the film body after the film body is qualified to finish the processing of the high-barrier composite BOPP film.

Further, before the film body obtained in the step S2 is subjected to the step S3, corona treatment and coating treatment are selectively performed on the film body according to actual needs.

Further, the hot compress treatment comprises the following specific steps:

s31, adsorbing an attaching strip through a manipulator connected with a strip moving plate, and placing the attaching strip on a target part to be cut of the film body;

s32, controlling the strip moving plate to heat, extruding the attaching strips to enable the attaching strips to be flattened in a hot melting mode and to be evenly adhered to the film body, cooling and solidifying the attaching strips to enable the flattened attaching strips to be in a state that two sides are colored and the middle is colorless, and cutting the colorless middle by aligning a cutting knife to the colorless middle during cutting to form the film body with two cut edges provided with the edge protection layers.

Further, the optical inspection process comprises the following specific steps:

s41, irradiating the edge of the film body adhered with the edge protection layer by using a light beam to form a shadow under the action of light, projecting the shadow on a pure smooth background wall, and controlling the distance between the film body and the background wall to be 3-5 times of the distance between a light source and the film body;

s42, observing the edge of the shadow on the background wall, and removing the film body with the obvious gap, wherein the film body without the obvious gap meets the standard.

Further, it has electric magnetic stripe and hot plate to move slat lower extreme electric connection, the electric magnetic stripe is located the hot plate middle part, and the two bottom surface and move the equal parallel and level each other of slat lower surface.

Further, the edge strip includes outer melting adhesive tape, wraps up the interior auxiliary piece and two fixed inlay including outer melting adhesive tape lower extreme surface and is close to the interior liquid guide layer of outer melting adhesive tape inner wall of auxiliary piece, outer melting adhesive tape upper end middle part is fixed to be inlayed and is had ferromagnetic strip, interior auxiliary piece bottom middle part fixedly connected with and the transparent arch that ferromagnetic strip corresponds, the colour development strip has all been placed at both ends about transparent arch, and two colour development strips and two interior liquid guide layers are all about transparent protruding symmetry, and colour development strip and interior auxiliary piece contact.

Furthermore, dark liquid is filled in the color development strips in a saturated mode, the inner liquid guide layer is formed by arranging a plurality of cotton threads with strong water absorption, and the inner attached pieces are of high-temperature-resistant net surface structures.

3. Advantageous effects

Compared with the prior art, the invention has the advantages that:

(1) This scheme is through the complex with PVDC material, increase substantially BOPP film self separation nature, make the result of use better, additionally, in the course of working, handle through the hot compress, can wait to cut partial surface adhesion at BOPP film and change into the limit strip that attaches of stratiform by the strip, when the cutting, on the one hand, its gravity at effectively increase film body edge, make it be difficult for with cutting knife or other object adhesion, effectively avoid causing the formation of tearing opening because of local adhesion, on the other hand, the edge presents coloured state after the cutting, the relative all the other parts light transmissivity of its light transmissivity deteriorates, cooperation light detection handles, can form more clear influence, increase substantially the probability that the breach was discovered, effectively reduce to roll up the film edge that establishes and have the probability of breach, improve the result of use.

Drawings

FIG. 1 is a schematic structural diagram of a BOPP film of the present invention;

FIG. 2 is a schematic structural diagram of a BOPP film section of the invention;

FIG. 3 is a schematic structural diagram of an edge protection layer portion of a BOPP film according to the present invention;

FIG. 4 is a schematic structural view of a cross section of the bead of the present invention;

FIG. 5 is a schematic perspective view of the edge strip of the present invention;

FIG. 6 is a schematic view showing a structure of a film body according to the present invention in a process of performing a hot compress treatment;

FIG. 7 is a schematic structural diagram of a slat of the present invention;

FIG. 8 is a partial structural view of the present invention when the cross section of the attaching edge strip becomes flat after being subjected to heat pressing;

FIG. 9 is a schematic diagram of the present invention during the light inspection process.

The reference numbers in the figures illustrate:

the film comprises a film body 1, an edge protection layer 2, an outer film layer 11, an inner interlayer 12, an inner film layer 13, an outer melt adhesive layer 21, an inner attached layer 22, an outer melt adhesive tape 31, an inner attached sheet 321, an inner liquid guide layer 322, a ferromagnetic strip 4, a color development strip 5, a strip moving plate 6, a heating plate 71 and an electromagnetic strip 72.

Detailed Description

The drawings in the embodiments of the invention will be combined; the technical scheme in the embodiment of the invention is clearly and completely described; obviously; the described embodiments are only some of the embodiments of the present invention; but not all embodiments, are based on the embodiments of the invention; all other embodiments obtained by a person skilled in the art without making any inventive step; all fall within the scope of protection of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top/bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted", "provided", "fitted/connected", "connected", and the like, are to be interpreted broadly, such as "connected", which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example 1:

referring to fig. 1-2, a high barrier composite BOPP film includes a film body 1, a protective layer 2 is thermally laminated on the left and right upper ends of the film body 1, the film body 1 includes an outer film layer 11, an inner interlayer 12 and an inner film layer 13 which are mutually laminated in sequence from top to bottom, the inner interlayer 12 is a biaxially oriented polypropylene film material, the outer film layer 11 and the inner film layer 13 are both made of PVDC material, and PVDC is homopolymerized polyvinylidene chloride.

In practice, the PVDC may also be selected from a copolymer of methyl acrylate and polyvinylidene chloride or a copolymer of vinyl chloride and polyvinylidene chloride, and is not limited to polyvinylidene chloride.

Referring to fig. 3, the edge protection layer 2 includes an inner adhesion layer 22 and an outer adhesive layer 21 adhered to the upper surface of the inner adhesion layer 22, the outer adhesive layer 21 penetrates through the inner adhesion layer 22 and is adhered to the upper surface of the outer film layer 11 by hot pressing, one side of the edge protection layer 2 close to the edge is colorless and transparent, and the portion of the edge protection layer 2 far from the edge is colored.

Outer melten gel layer 21 is made for hot melt material, outer melten gel layer 21 hot melt temperature is less than the hot melt temperature of film body 1, and the two hot melt difference in temperature is not less than 20 ℃, effectively guarantee in the production and processing process, when carrying out the hot compress to the film body 1 that forms after the biaxial stretching, outer melten gel strip 31 hot melt is pressed into outer melten gel layer 21's platykurtic by the circular shape strip in cross-section, film body 1 is difficult for receiving the influence of temperature when should being heated, difficult emergence fold or fused phenomenon.

s1, respectively hot-melting high-molecular polypropylene and PVDC materials, co-extruding melts of the high-molecular polypropylene and the PVDC materials through a co-extrusion die head, cutting the co-extruded melts to form sheets, and performing three-layer co-extrusion during co-extrusion, wherein the three-layer co-extrusion is performed in sequence of PVDC-high-molecular polypropylene-PVDC melts, so that PVDC is compounded inside and outside an obtained film body 1, and the barrier property of the film body is effectively guaranteed;

s2, performing biaxial stretching on the sheet through a special stretcher, and cooling to obtain a film body 1;

s3, carrying out hot compress treatment on the part of the film body 1 needing to be cut, and then carrying out cutting operation at the hot compress position;

and S4, performing optical inspection treatment on the edge of the cut film body 1, and winding, packaging and warehousing the film after the film is qualified to finish the processing of the high-barrier composite BOPP film.

Before the film body 1 obtained in the step S2 is subjected to the step S3, corona and coating treatment is selectively performed on the film body 1 according to actual needs.

The hot compress treatment comprises the following specific steps:

s31, adsorbing an edge strip through a manipulator connected with a strip moving plate 6, and placing the edge strip on a target part to be cut of the film body 1;

the specific structure of the manipulator is the prior art, which is not specifically disclosed herein, the movement of the ribbon moving plate 6 is controlled by the manipulator, and the connection mode between the ferromagnetic strip 4 and the manipulator can be threaded connection, clamping connection and the like, and in specific implementation, technicians can set and select the ribbon moving plate reasonably according to actual conditions;

s32, the heating of lath 6 is moved in the control, and the extrusion attaches the strake, make its hot melt flatten and even adhesion on film body 1, and cool off solidification processing, it is coloured to make the limit of attaching that is flattened form both sides, the colourless state in middle part, during the cutting, the cutting knife is aimed at the colourless part in middle part and is cut, thereby form two incision edges and all have film body 1 who protects limit layer 2, the colourless part in middle part is convenient for when the cutting, fix a position the cutting point, it is relatively even to guarantee effectively that the limit layer 2 on the film body 1 edge after the cutting is relatively even, the too big condition of width difference is difficult to appear.

The optical detection treatment comprises the following specific steps:

s41, irradiating the edge of the film body 1 adhered with the edge protection layer 2 by using a light beam to form a shadow under the action of light, and projecting the shadow on a pure-color smooth background wall, as shown in FIG. 9, controlling the light source, the edge of the film body 1 and the background wall to be parallel to each other in space and to be positioned on the same straight line as much as possible, controlling the distance between the film body 1 and the background wall to be 3-5 times of the distance between the light source and the film body 1, wherein the distance between the film body 1 and the background wall is too small, so that the imaging is relatively small, the amplification effect on the edge of the film body 1 is poor, the difficulty of finding cracks and the like is still large, the distance is too far, the imaging edge is too virtual, and the finding of the edge cracks on the edge is also influenced;

s42, observing the edge of the shadow on the background wall, and removing the film body 1 with the obvious gap, wherein the film body 1 without the obvious gap meets the standard.

The lower end of the strip moving plate 6 is electrically connected with an electric magnetic strip 72 and a heating plate 71, the electric magnetic strip 72 is positioned in the middle of the heating plate 71, the bottom surfaces of the two are flush with the lower surface of the strip moving plate 6, the electric magnetic strip 72 is electrified to enable the electric magnetic strip to have magnetism, at the moment, 3 can be adsorbed and aligned to the area to be cut of the film body 1, then the heating plate 71 is controlled to be electrified to enable the electric magnetic strip to be heated, meanwhile, the strip moving plate 6 is controlled by a manipulator to extrude 3, the electric magnetic strip is gradually changed from a cylindrical shape to a flat shape, meanwhile, the hot melting is carried out, 3 can be covered on the edge of the film body 1 in a hot pressing mode, the edge protecting layer 2 is formed, after the hot pressing, the manipulator is controlled to reset, the ferromagnetic strip 4 is carried to reset together, the ferromagnetic strip 4 is recycled, meanwhile, the middle part of the strip 3 after the hot pressing is sunken shape, and the cutting and the positioning are convenient.

The attaches the strake including outer melting adhesive tape 31, wrap up at outer melting adhesive tape 31 lower extreme surface's interior tag 321 and two fixed inlays interior liquid guide layer 322 that is close to outer melting adhesive tape 31 inner wall including tag 321, outer melting adhesive tape 31 upper end middle part is fixed to be inlayed and has ferromagnetic strip 4, interior tag 321 bottom middle part fixedly connected with is the transparent protrusion that corresponds with ferromagnetic strip 4, color development strip 5 has all been placed at both ends about transparent protrusion, the inside saturated packing of color development strip 5 has dark liquid, transparent protrusion is convenient for divide into two parts with 3, when making hot pressing, dark liquid that it oozes after color development strip 5 breaks is difficult for spreading towards color development strip 5 middle part, but by interior liquid guide layer 322 absorption, make color development strip 5 both sides present colored state, two color development strip 5 and two interior liquid guide layers 322 all are about transparent protrusion symmetry, and color development strip 5 and interior tag 321 contact, simultaneously because ferromagnetic strip 4 is retrieved sunken and the colorless part that forms and corresponds, the staff of being convenient for further location of cutting point, effectively guarantee that cutting department is located between two interior liquid guide layers 322.

Interior drainage layer 322 is formed by arranging the cotton thread that many hydroscopicities are strong, make it break the back at color development strip 5, can adsorb dark liquid fast, make safe edge layer 2 except that the edge can present obvious coloured state, be convenient for cut the location, interior tag 321 is high temperature resistant wire side structure, when the hot pressing, thereby it passes interior tag 321 space and 1 hot pressing cladding of film body to be convenient for outer melting adhesive tape 31 hot melt, in addition, outer melting adhesive layer 21 of outer melting adhesive tape 31 formation after the hot pressing, interior tag 321 forms interior tag 22.

Through the complex with PVDC material, increase substantially BOPP film self separation nature, make the result of use better, in addition, in the course of working, handle through the hot compress, can wait at BOPP film that cut partial surface adhesion changes into the limit strip that attaches of stratiform by the strip, when the cutting, on the one hand, its gravity at 1 edge of effective increase film body, make it be difficult for with cutting knife or other object adhesion, effectively avoid causing the formation of tearing the mouth because of local adhesion, on the other hand, the edge presents coloured state after the cutting, the relative all the other parts light transmissivity of its light transmissivity worsen, cooperation light is examined the processing, can form more clear influence, improve the probability that the breach was found by a wide margin, effectively reduce the film edge that the book was established and have the probability of breach, improve the result of use.

The above; but are merely preferred embodiments of the invention; the scope of the invention is not limited thereto; those skilled in the art can appreciate that the present invention is not limited to the specific embodiments disclosed herein; the technical scheme and the improved concept of the invention are equally replaced or changed; are intended to be covered by the scope of the present invention.

Claims

1. The utility model provides a high resistant separates compound BOPP film, includes film body (1), its characterized in that: film body (1) is controlled two upper ends soaking and is pressed veneer and have safe edge layer (2), film body (1) from the top down is in proper order including outer rete (11), interior intermediate layer (12) and interior rete (13) that clad each other, safe edge layer (2) include with interior nexine (22) and bond outer melten layer (21) at interior nexine (22) upper surface, outer melten layer (21) run through interior nexine (22) and bond through hot pressing with outer rete (11) upper surface, safe edge layer (2) are close to one side colorless transparent at edge, the part that safe edge layer (2) kept away from the edge presents the colored state.

2. The high-barrier composite BOPP film according to claim 1, wherein: the outer melt adhesive layer (21) is made of hot melt materials, the hot melt temperature of the outer melt adhesive layer (21) is lower than that of the film body (1), and the hot melt temperature difference of the outer melt adhesive layer and the film body is not less than 20 ℃.

3. The high-barrier composite BOPP film and the processing technology thereof according to claim 1, wherein the high-barrier composite BOPP film is characterized in that: the inner interlayer (12) is a biaxially oriented polypropylene film material, the outer film layer (11) and the inner film layer (13) are both made of PVDC materials, and the PVDC is one of homopolymerized polyvinylidene chloride, methyl acrylate-polyvinylidene chloride copolymer and vinyl chloride-polyvinylidene chloride copolymer.

4. The processing technology of the high-barrier composite BOPP film according to claim 2, characterized in that: the method comprises the following steps:

s2, performing bidirectional stretching on the sheet material through a special stretcher, and cooling to obtain a film body (1);

s3, carrying out hot compress treatment on the part of the film body (1) needing to be cut, and then carrying out cutting operation at the hot compress position;

and S4, performing optical inspection treatment on the edge of the cut film body (1), and winding, packaging and warehousing after the cut film body is qualified to finish the processing of the high-barrier composite BOPP film.

5. The processing technology of the high-barrier composite BOPP film according to claim 4, characterized in that: before the film body (1) obtained in the step S2 is subjected to the step S3, the film body (1) is subjected to corona and coating treatment selectively according to actual needs.

6. The processing technology of the high-barrier composite BOPP film according to claim 4, characterized in that: the hot compress treatment comprises the following specific steps:

s31, adsorbing an attaching strip through a manipulator connected with a strip moving plate (6), and placing the attaching strip on a target part to be cut of the film body (1);

s32, controlling the strip moving plate (6) to heat, extruding the attaching strips to enable the attaching strips to be flattened and adhered to the film body (1) uniformly in a hot melting mode, cooling and solidifying to enable the flattened attaching strips to be colored at two sides and colorless in the middle, and cutting the colorless part in the middle by a cutting knife during cutting to form the film body (1) with two cut edges provided with the edge protection layers (2).

7. The processing technology of the high-barrier composite BOPP film according to claim 6, characterized in that: the optical detection treatment comprises the following specific steps:

s41, irradiating the edge of the film body (1) adhered with the edge protection layer (2) by using a light beam to form a shadow under the action of light, projecting the shadow on a pure smooth background wall, and controlling the distance between the film body (1) and the background wall to be 3-5 times of the distance between a light source and the film body (1);

s42, observing the edge of the shadow on the background wall, and removing the film body (1) with the obvious gap, wherein the film body (1) without the obvious gap meets the standard.

8. The processing technology of the high-barrier composite BOPP film according to claim 6, characterized in that: move slat (6) lower extreme electric connection have electric magnetic stripe (72) and hot plate (71), electric magnetic stripe (72) are located hot plate (71) middle part, and both bottom surfaces and move slat (6) lower surface and all parallel and level each other.

9. The processing technology of the high-barrier composite BOPP film according to claim 6, characterized in that: attach the strake including outer melting adhesive tape (31), parcel outside interior slice (321) and two fixed inlay including outer melting adhesive tape (31) lower extreme surface be close to outer melting adhesive tape (31) inner wall's interior drainage layer (322), outer melting adhesive tape (31) upper end middle part is fixed to be inlayed and is had ferromagnetic strip (4), interior slice (321) bottom middle part fixedly connected with is with the transparent arch that ferromagnetic strip (4) correspond, colour development strip (5) have all been placed at both ends about transparent arch, and drainage layer (322) are all symmetrical about transparent arch in two colour development strips (5) and two, and colour development strip (5) and interior slice (321) contact.

10. The processing technology of the high-barrier composite BOPP film according to claim 9, characterized in that: the color development strip (5) is internally filled with deep color liquid in a saturated mode, the inner liquid guide layer (322) is formed by arranging a plurality of cotton threads with strong water absorption, and the inner attached sheet (321) is of a high-temperature-resistant net surface structure.