CN115417007B - Novel easy-to-uncover dry-wet separation bag, preparation process and heat-sealing layer film - Google Patents

Novel easy-to-uncover dry-wet separation bag, preparation process and heat-sealing layer film Download PDF

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Publication number
CN115417007B
CN115417007B CN202210880557.3A CN202210880557A CN115417007B CN 115417007 B CN115417007 B CN 115417007B CN 202210880557 A CN202210880557 A CN 202210880557A CN 115417007 B CN115417007 B CN 115417007B
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layer
easy
heat
bag
film
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CN115417007A (en
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权俊
甘乐勇
赵鹏伟
胡优冰
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Hangzhou God Color Printing Packaging Co ltd
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Hangzhou God Color Printing Packaging Co ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D81/00—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents
    • B65D81/32—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents for packaging two or more different materials which must be maintained separate prior to use in admixture
    • B65D81/3261—Flexible containers having several compartments
    • B65D81/3266—Flexible containers having several compartments separated by a common rupturable seal, a clip or other removable fastening device
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
    • B29C48/10—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels flexible, e.g. blown foils
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
    • B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
    • B29C55/28—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of blown tubular films, e.g. by inflation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C71/00—After-treatment of articles without altering their shape; Apparatus therefor
    • B29C71/0081—After-treatment of articles without altering their shape; Apparatus therefor using an electric field, e.g. for electrostatic charging
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B31B70/60—Uniting opposed surfaces or edges; Taping
    • B31B70/62—Uniting opposed surfaces or edges; Taping by adhesives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B31B70/60—Uniting opposed surfaces or edges; Taping
    • B31B70/64—Uniting opposed surfaces or edges; Taping by applying heat or pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B31B70/74—Auxiliary operations
    • B31B70/86—Forming integral handles or mounting separate handles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/308—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising acrylic (co)polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D31/00—Bags or like containers made of paper and having structural provision for thickness of contents
    • B65D31/12—Bags or like containers made of paper and having structural provision for thickness of contents with two or more compartments
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D75/00—Packages comprising articles or materials partially or wholly enclosed in strips, sheets, blanks, tubes, or webs of flexible sheet material, e.g. in folded wrappers
    • B65D75/52—Details
    • B65D75/58—Opening or contents-removing devices added or incorporated during package manufacture
    • B65D75/5827—Tear-lines provided in a wall portion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D77/00—Packages formed by enclosing articles or materials in preformed containers, e.g. boxes, cartons, sacks or bags
    • B65D77/08—Materials, e.g. different materials, enclosed in separate compartments formed during filling of a single container
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/05—5 or more layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/24—All layers being polymeric
    • B32B2250/246—All polymers belonging to those covered by groups B32B27/32 and B32B27/30
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/30—Properties of the layers or laminate having particular thermal properties
    • B32B2307/31—Heat sealable

Abstract

The invention relates to the technical field of packaging bags, in particular to a novel easy-to-tear dry-wet separation bag, which comprises an inner packaging bag and a packaging outer layer arranged on the outer side of the inner packaging bag, wherein a separation belt is arranged in the inner packaging bag, the inner packaging bag is separated by the separation belt to form a first cavity and a second cavity, the separation belt comprises a sealing section and an easy-to-tear heat sealing section, both sides of the easy-to-tear heat sealing section are respectively provided with a hand-tear handle which can extend outwards, the hand-tear handles are formed by cutting the packaging outer layer, the connecting parts of the hand-tear handles and the packaging outer layer are arranged on the outer side of the easy-to-tear heat sealing section, the easy-to-tear heat sealing section is separated after being stretched outwards by the hand-tear handles on both sides, and the first cavity and the second cavity are communicated by the separated easy-to-tear heat sealing section. The hand tearing handle can be formed under the condition that the thickness of the packaging bag is not increased, so that the heat sealing section easy to be torn off is quickly separated through the hand tearing handle.

Description

Novel easy-to-uncover dry-wet separation bag, preparation process and heat-sealing layer film
Technical Field
The invention relates to the technical field of packaging bags, in particular to a novel easy-to-tear dry-wet separation bag, a preparation process and a heat-seal layer film.
Background
Sealed packages are packaging products commonly encountered in the current life, and are produced in order to create a dry-wet separation of two areas within the package. When the current packaging bag for dry and wet separation is used, the packaging of the packaging bag for dry and wet separation on the market usually adopts two modes of extrusion mixing and separate external pull ring. The squeezing type dry-wet separation bag is a facial mask bag shown as a dry-wet separation facial mask bag and a skin care facial mask in patent 202022979499.9, and the dry-wet separation bag with a pull ring separately added is a facial mask packaging structure for dry-wet separation in patent 201910925224.6 and a pull-open type dry-wet separation packaging bag in patent 202120754743.3. However, the dry-wet separation bags have obvious disadvantages: 1. the dry-wet separation bag adopting the extrusion mixing mode has poor use experience of consumers, large extrusion force, difficult use for women and larger risk of mutual extrusion mixing in the transportation process; 2. the dry-wet separation bag adopting the mode of independently adding the pull ring has the advantages of high cost, high manufacturing difficulty, high process requirement, low production efficiency, difficulty in forming automatic production, large number of manual pull rings, no matter the heat-sealing pull rings or the adhesive pull rings, and material stagnation easily formed along with the change of order quantity; meanwhile, the overall thickness of the dry-wet separation bag adopting the externally-added pull ring structure can be increased, so that the packaging cost is increased, and the pull ring type dry-wet separation bag is easy to tear in a large range after being pulled, so that the condition that liquid completely flows into a cavity where the mask cloth is located at one time is caused, and the flow of mask essence cannot be controlled.
The heat sealing layer film is often used when manufacturing the dry-wet separation bag, however, the temperature and pressure required by the heat sealing layer film in the prior art are higher, the heat sealing stability is poor, and even under the heat sealing condition of the same temperature, pressure and time, the fluctuation of the heat sealing strength formed after two heat sealing is larger, so that the integral heat sealing effect is influenced, and the phenomenon that the heat sealing strength is excessive or the heat sealing strength is too low during heat sealing is easy to occur.
Disclosure of Invention
In order to solve the problem that two cavities in the existing dry-wet separation bag are not easy to pull and communicate when in use, the invention provides a novel easy-to-tear dry-wet separation bag.
The invention provides a novel easy-uncovering dry-wet separation bag, which adopts the following technical scheme:
the utility model provides a novel easy tear dry wet separation bag, is in including interior wrapping bag, establish the packing outside the interior wrapping bag, be equipped with a median in the interior wrapping bag, interior wrapping bag passes through the median separates and forms first cavity and second cavity, the median includes sealed section and easy heat seal section of taking off, easy heat seal section both sides all are equipped with the hand that can outwards stretch out and tear the pull handle, the pull handle passes through the packing is outer to tailor the shaping, the pull handle with the packing is outer connecting portion is established easy take off the outside of heat seal section, easy heat seal section passes through both sides the pull handle outwards stretches back and produces the separation, first cavity with the second cavity is through after the separation easy heat seal section intercommunication of taking off.
Through adopting above-mentioned technical scheme, when separating through the median between first cavity and second cavity, because the median comprises the seal section that the connection fastness is higher and the easy heat seal section of taking off that receives the pulling force separately easily, when the both sides of taking off the heat seal section easily receive outside pulling force, can make take off the heat seal section and form the passageway after realizing quick separation easily to make first cavity and second cavity realize intercommunication each other, liquid in the first cavity in the wet separation facial mask bag of drying for example flows into in the second cavity through the quick heat seal section of taking off of separation. And in the process of easily taking off heat seal section separation, when the separation scope reached the sealed section, the stop that again can carry out quick realization passageway continued to make the liquid in the first cavity flow out efficiency controllable, when using, can avoid all liquid to once only flow into the condition emergence of second cavity entirely, when the liquid that contains in the first cavity is more, can carry out repetitious usage, and after the second cavity is unsealed, it is more convenient to seal to the first cavity, the effectual current dry wet separation bag of solution is tearing the use after, to the problem that the resealing degree of difficulty of bag body itself is high. Simultaneously, the hand tearing handle is directly formed by the processing of the mode of cutting out of the outer package layer itself, and the connecting part of the hand tearing handle is located outside the easy-to-tear heat sealing section, because the outer package layer and the hand tearing handle are integrally formed, the whole body of the hand tearing handle is attached to the outside of the inner package bag, and accordingly the dry-wet separation bag is free of the phenomenon of external protrusion, the whole dry-wet separation bag can not be increased in thickness when the hand tearing handle is increased, and when the easy-to-tear heat sealing section is separated, the separation of the easy-to-tear heat sealing section can be realized only by directly pinching the hand tearing handle and pulling out the hand tearing handle, and the phenomenon that the existing easy-to-tear heat sealing section is not easy to separate is effectively solved.
Optionally, a release agent is arranged between the hand tearing handle and the inner packaging bag, and the hand tearing handle is attached to the inner packaging bag through the release agent.
Through adopting above-mentioned technical scheme, the hand tearing is pulled to laminating on the inner packaging bag through the release, can make the hand tearing pull and the inner packaging bag between realize closely laminating, and peel strength 0 ~ 0.8N/15mm after the complex of release, when need pull the hand tearing pull and separate from the inner packaging bag, can realize easy separation. The parting agent mainly adopts one of the following components:
1. fluorine-containing release agent: it is characterized by that after coating, a solid layer with low surface tension is formed on the film surface, so that the composite glue has no adhesive force on its surface, and its release effect is that its peel strength is 0-0.3N/15 mm after compounding
2. Silicon-containing release agent: it is characterized in that an oily layer with low surface tension is formed on the surface of the film after coating, so that the composite glue has no adhesive force on the surface, and the release effect is that the peel strength after the composite is 0-0.5N/15 mm
3. Acrylic release agent: the method is characterized in that a solid layer with low adhesive force is formed on the surface of a film after coating, and is easy to peel from the surface of the film to form a release effect, wherein the release effect is that the peel strength after compounding is 0.2-0.8N/15 mm
Optionally, natural layering is adopted between the hand tearing handle and the inner packaging bag, at least one linking point is arranged between the hand tearing handle and the outer packaging layer, and the hand tearing handle is attached to the outer side of the inner packaging bag through the linking point.
Through adopting above-mentioned technical scheme, when adopting natural layering between hand tearing pull handle and the inner packaging bag, generally connect through 1~3 tie points between hand tearing pull handle and the packing skin to make hand tearing pull handle paste outside the inner packaging bag through the tie point, when needs use, only need hand tearing pull handle outside simple knot chee, just can be the tie point and produce the fracture, thereby make hand tearing pull handle realization light withhold.
Optionally, the heat sealing width of the easy-tearing heat sealing section is smaller than the width of the sealing section, the easy-tearing heat sealing section at least comprises a peak protruding towards the inner side of the first cavity or the second cavity, and the connecting part of the hand-tearing handle is arranged on one side of the peak.
Through adopting above-mentioned technical scheme, the span of easy heat-seal section of taking off is less than the width of sealed section, can make easy heat-seal section of taking off more easily separate when receiving tensile tearing, simultaneously, easy heat-seal section of taking off has to be formed with peak valley structure when the heat-seal, and the connecting portion that the hand was torn the pull handle is located one side of peak, can make easy heat-seal section of taking off realize tearing to the face when receiving tensile, make its separation simpler, simultaneously in tearing the in-process, after easy heat-seal section of taking off is whole tears, the same power can't tear the sealed section again, thereby the length control of tearing of messenger's median is more convenient, the effectual problem that directly tears whole median directness whole or on a large scale of tearing structure has been solved, it is more convenient to make the shutoff again of sealed section, only need just can carry out the pertinence sealed through a small-size clip.
The invention provides a novel preparation process of a dry-wet separation bag easy to uncover, which aims to solve the problems that an existing dry-wet separation bag with a pull handle is complex in preparation process and large in overall thickness.
A novel easy-to-tear dry-wet separation bag preparation process comprises the following steps: s1, manufacturing an inner packaging bag with an inner single side: the single-side inner packaging bag sequentially comprises a barrier layer, an adhesive layer and an easily-uncovered heat sealing layer from outside to inside, and the easily-uncovered heat sealing layer is bonded and attached with the barrier layer by adopting a dry-method compounding process to prepare a composite semi-finished product single-side inner packaging layer composite film;
s2, manufacturing a packaging outer layer: the packaging outer layer sequentially comprises a PET high-strength pull handle layer, an adhesive layer and a printing base film/ink layer from outside to inside, wherein the printing ink layer takes PET and PA as printing base film materials, a printing film is prepared by adopting a printing process, namely the printing base film/ink layer is prepared by adopting a dry process compounding process to compound the PET high-strength pull handle layer, and a compound semi-finished product packaging outer layer compound film is prepared;
s3, curing the packaging outer layer composite film prepared in the step S2 at a high temperature, and performing cutting or windowing die cutting treatment on a designated position through a positioning die cutting process to form a hand tearing handle with a handle function on the packaging outer layer composite film, wherein the hand tearing handle forms a local point connection or separation structure between a die cutting area and the packaging outer layer composite film after the die cutting treatment;
S4, compounding the packaging outer layer composite film with the hand tearing handle on the inner packaging layer composite film through an adhesive layer, bonding the packaging outer layer composite film and the inner packaging layer composite film by adopting a dry method compounding process, thereby preparing a single-side composite film of the dry-wet separation bag,
when the die cutting area of the hand tearing handle is connected with the outer packaging layer composite film through local points, natural separation is adopted between the hand tearing handle and the inner packaging layer composite film, and the hand tearing handle is attached to the outer side of the inner packaging layer composite film through the connecting points;
when a separation structure is adopted between the die cutting area of the hand tearing handle and the packaging outer layer composite film, the packaging outer layer composite film is coated with a release agent layer, and the hand tearing handle is attached to the outer side of the inner packaging layer composite film through the release agent layer;
s5, curing the two single-side composite films at high temperature and transferring to a bag making process to manufacture the dry-wet separation bag.
By adopting the technical scheme, when the novel easy-to-tear dry-wet separation bag is produced and manufactured, automatic operation can be realized, and the preparation process for the hand-tearing handle is simple. Meanwhile, when the packaging outer layer is manufactured, PET and PA are used as printing base film materials for the printing ink layer, and a PET high-strength pull handle layer is attached to the outer side of the printing ink layer, so that the pull strength of the hand-tearing pull handle is higher, and the problem that the existing base layer directly used as the hand-tearing pull handle is easy to break or pull and deform is effectively solved. When the prepared packaging outer layer composite film is cured at a high temperature in the step S3, the packaging outer layer composite film is rolled up and put into a high-temperature drying room, so that the glue undergoes a crosslinking reaction at a temperature of generally 40-50 ℃, when the hand tearing handle is produced and molded in a die cutting mode, the incision is smoother, the molding is more convenient, the process is simpler, the problems of complex manufacturing process, high manufacturing cost and low efficiency of the handle are effectively solved, and the packaging outer layer can be manufactured in an automatic assembly line in the manufacturing process.
After the preparation process is adopted, the problems that the existing pull ring outside the dry-wet separation bag is high in cost, high in manufacturing difficulty, high in process requirement and low in production efficiency, automatic production is difficult to form, a large number of manual pull rings are needed, the overall thickness of the dry-wet separation bag is increased, and therefore packaging cost is increased are effectively solved.
Optionally, the heat sealing pressure of the easily-uncovered heat sealing section is 0.1-0.5 MPa, the heat sealing temperature is 150+/-30 ℃, and the heat sealing strength is 5+/-2N/15 mm; the heat sealing pressure of the sealing section and the outside sealing edge in the dry-wet separation bag is 0.2-0.8 MPa, the heat sealing temperature is 200+/-20 ℃, and the heat sealing strength is 12+/-3N/15 mm.
Through adopting above-mentioned technical scheme, the heat-seal pressure, the temperature and the intensity of easy take off the heat-seal section all are less than the heat-seal pressure, the temperature and the intensity of the sealed section and outside sealing edge in the wet and dry separation bag, can make easy take off the heat-seal section be able to bear or endure when tearing through the hand tearing pull ring and more easily separate, simultaneously, can also guarantee easy take off the heat-seal section and not broken bag under 40 kg's pressure at the compressive strength after the heat-seal to the difficult seepage of liquid.
Optionally, the barrier layer is one of aluminum foil, aluminizer or alumina coating.
By adopting the technical scheme, the inner packaging bag has good high barrier property and sealing property.
Optionally, the PET high-strength pull handle layer is made of a high-strength PET film, the thickness of the PET high-strength pull handle layer is 12-60 mu, and the thickness of the easy-to-tear heat seal layer is 40-120 mu.
Through adopting above-mentioned technical scheme, when can making the thickness of whole dry wet separation bag thinner, the tensile strength of hand tear handle is higher, and the hand tear handle is difficult for appearing tearing.
The heat sealing strength of the existing heat sealing film is unstable, the heat sealing strength can only be achieved through high temperature, when the heat sealing temperature and the pressure are consistent, the heat sealing strength is inconsistent for two times, the fluctuation is large,
the invention provides a preparation process of a novel easy-to-tear dry-wet separation bag, which aims to solve the problem that the heat sealing strength of the existing heat sealing layer film is unstable because the existing heat sealing layer film has the problem that the heat sealing strength is unstable after heat sealing.
The heat-sealing layer film for the novel easy-to-tear dry-wet separation bag comprises the following components of polyethylene, polyethylene-vinyl acrylate and polyethylene-acrylic resin, wherein the inner packaging bag film is produced by adopting a five-layer coextrusion film blowing process, the first three layers of the inner packaging bag film are polyethylene resins, the fourth layer of the inner packaging bag film is a mixture of polyethylene and polyethylene-acrylic resin, the ratio of the polyethylene to the polyethylene-acrylic resin is 1:1, the fifth layer of the inner packaging bag film is a mixture of polyethylene and polyethylene-vinyl acrylate, and the ratio of the polyethylene to the polyethylene-vinyl acrylate is 1:4.
By adopting the technical scheme, the front three layers adopt the mixture of the low-density polyethylene and the linear low-density polyethylene, for example, the heat sealing layer film can effectively improve the overall strength through the front three layers by mixing the low-density polyethylene (2420H) and the linear low-density polyethylene (0220 AA). Meanwhile, a high-strength heat seal film layer with high viscosity can be formed through the fourth layer, and a bottom strength heat seal film layer with a viscous bottom can be formed through the fifth layer, so that the heat seal film can form a double platform with stable heat seal strength through the fourth layer and the fifth layer.
When the heat seal strength requirement is lower, for convenient subsequent separation, only need set up the back through heat sealing equipment to temperature and pressure, make the fifth layer between two heat seal layer films produce and bond each other, just can realize the effect of end heat seal strength, and when the heat seal strength requirement is higher, for convenient assurance connection's fastness, only need set up the back through heat sealing equipment to temperature and pressure, make fourth layer and the fifth layer between two heat seal layer films all produce and bond each other, just can realize the effect of high heat seal strength. For example: the low heat-seal strength platform mainly provides heat-seal strength by fifth layer resin, adopts a heat-seal process with heat-seal pressure of 0.1-0.5 MPa and heat-seal temperature of 150+/-30 ℃ and heat-seal strength of 5+/-2N/15 mm; the high heat sealing strength platform mainly provides heat sealing strength by the fourth layer of resin, adopts a heat sealing process with heat sealing pressure of 0.2-0.8 MPa and heat sealing temperature of 200+/-20 ℃, and has heat sealing strength of 12+/-3N/15 mm. The fourth layer is a mixture of polyethylene and polyethylene-acrylic acid resin, the ratio of the polyethylene to the polyethylene-acrylic acid resin is 1:1, the fifth layer is a mixture of polyethylene and polyethylene-vinyl acrylate, and the ratio of the polyethylene to the polyethylene-vinyl acrylate is 1:4, can make the heat-seal effect of heat-seal layer film more stable, when heat-seal temperature and pressure are unanimous, can make the intensity fluctuation after the twice heat-seal less, effectually solved the problem that current heat-seal layer film can't realize forming the easy heat-seal section of taking off of high bond strength and bottom intensity bonding to direct through the heat-seal layer on the same barrier tape.
Optionally, when the five-layer co-extrusion film blowing process is adopted to manufacture the heat seal layer easy to uncover, the process comprises the following steps:
step 1, five layers of resin forming the easy-to-uncover heat seal layer are respectively fed, mixed, melted and extruded by adopting independent five screws;
step 2, five layers of extruded molten resin enter a die head through a runner, so that the molten resin in the die head is stacked in five layers from outside to inside;
step 3, uniformly extruding five layers of stacked resin from a die opening of a die head, transversely blowing and longitudinally stretching to enable the thickness of the film to reach a required thickness range, and cooling by adopting an internal circulation cooling system and an external blowing cooling system to obtain the heat-sealing layer film;
step 4, carrying out surface treatment on the cooled heat-sealing layer film by an online corona machine to ensure that the surface tension of a corona surface is more than or equal to 38dyn;
and 5, cutting into the required width and winding.
In summary, the invention has the following beneficial effects:
1. cutting a hand-tearing handle on the outer packaging layer, wherein the connecting part of the hand-tearing handle is positioned outside the easy-tearing heat-sealing section, and when the easy-tearing heat-sealing section is separated, the separation can be realized only by outwards pulling the hand-tearing handles on two sides of the easy-tearing heat-sealing section, so that two cavities in the inner part are communicated, and the hand-tearing handle formed on the outer packaging layer does not need to be added with a separate accessory, and meanwhile, the whole thickness of the whole dry-wet separation bag is not required to be increased, thereby not only effectively solving the problem that the heat-sealing section of the extrusion mixed dry-wet separation bag is not easy to separate, but also effectively solving the problems that the dry-wet separation bag in an externally-added pull ring mode has high manufacturing cost, complex process and easy increase of bag thickness;
2. Because the median comprises the seal section that the connection fastness is higher and receive the easy heat-seal section of taking off of pulling force separation easily, when the both sides of taking off the heat-seal section easily receive outside pulling force, can make take off the heat-seal section and form the passageway after realizing quick separation easily to make the liquid in the first cavity pass through the quick inflow second cavity of taking off the heat-seal section of taking off of separation. And in the process of easily tearing off the separation of heat seal section, when the separation scope reached the sealed section, the stop that can carry out quick realization passageway again was continued to it is controllable to make the liquid outflow efficiency in the first cavity, the effectual length uncontrollable problem of tearing back of the dry and wet separation bag heat seal section of having solved current dry and wet separation, can avoid the condition emergence of all liquid once only flowing into the second cavity, after the second cavity is unsealed, it is more convenient to seal the first cavity, the effectual current dry and wet separation bag of solution is tearing after using, the problem of high to the resealing degree of difficulty of bag body itself.
Drawings
FIG. 1 is a schematic view of the structure of embodiment 1 in a first embodiment of the present invention, showing the position structure of the combination of the inner bag and the outer bag with the tear-off heat seal segment;
FIG. 2 is a side view of a second embodiment of the invention showing the separation of the inner wrap and the outer wrap and the location of application of the release agent;
FIG. 3 is a side view of a third embodiment of the present invention showing the separation of the inner bag and the outer packaging layer and the connection of the tear handle to the outer packaging layer;
FIG. 4 is a flow chart of the process for preparing the dry-wet separation bag of the present invention;
in the figure: 1. a first cavity; 2. a separator; 21. a sealing section; 22. the heat sealing section is easy to uncover; 3. a second cavity; 4. a hand tearing handle; 5. peak tops; 6. an inner packaging bag; 7. packaging an outer layer; 8. a release agent; 9. and a link point.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings, and it should be noted that, on the premise of no conflict, new embodiments may be formed by any combination of the embodiments or technical features described below.
In the description of the present invention, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "left", "right", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of description and simplification of the description, and do not indicate or imply that the apparatus or element in question must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Embodiment 1, as shown in fig. 1, a novel easy-to-tear dry wet separating bag, including interior wrapping bag 6, establish the packing outer layer 7 in the interior wrapping bag 6 outside, be equipped with a median 2 in the interior wrapping bag 6, interior wrapping bag 6 passes through median 2 separates and forms first cavity 1 and second cavity 3, median 2 includes sealed section 21 and easy-to-tear heat seal section 22, easy-to-tear heat seal section 22 both sides all are equipped with the hand that can outwards stretch out and tear pull handle 4, hand-tear pull handle 4 passes through packing outer layer 7 tailors the shaping, hand-tear pull handle 4 with the connecting portion of packing outer layer 7 is established easy-to-tear heat seal section 22's outside, easy-to-tear heat seal section 22 passes through both sides hand-tear pull handle 4 outwards stretches back and produces the separation, first cavity 1 with second cavity 3 is through the after-separating easy-to-tear heat seal section 22 intercommunication.
In the use of dry and wet separating bag, dry and wet separating bag mainly divide into the interior wrapping bag 6 that is used for wrapping dry product and liquid and through the packing external layer 7 of binder adhesion in the outside, the bag face of dry and wet separating bag both sides is when sealing through the heat sealing equipment, dry and wet separating bag's inner chamber separates into dry and wet separated first cavity 1 and second cavity 3 through median 2, and when carrying out the heat seal to median 2 through the heat sealing equipment, will take one of them section as the heat seal section 22 of taking off easily, simultaneously, form a connecting portion through modes such as cross cutting or tailorring still with its hand tearing handle 4 of intercommunication on packing external layer 7, and the connecting portion of hand tearing handle 4 is located the both sides of heat seal section 22 of taking off easily, when needs to flow into second cavity 3 with liquid from first cavity 1 in, only need take off outside behind the handle 4 through the both sides hand tearing handle, just can simply and quick make the heat seal section 22 of taking off and form the separation. When separating through the median 2 between first cavity 1 and second cavity 3, because median 2 comprises seal segment 21 that the connection fastness is higher and the easy heat seal segment 22 that takes off that receives the pulling force and separate easily, when the both sides of easy heat seal segment 22 receive outside pulling force, can make the easy heat seal segment 22 take off form the passageway after realizing quick separation to make the liquid in the first cavity 1 flow into in the second cavity 3 through the easy heat seal segment 22 of taking off of separation is quick. And in the process of easily uncovering the separation of heat seal section 22, when the separation scope reached seal section 21, the stop that again can carry out quick realization passageway continued to make the liquid in the first cavity 1 flow out efficiency controllable, when using, can avoid all liquid once only to flow into the condition emergence of second cavity 3 entirely, when the liquid that contains in the first cavity 1 more, can carry out repetitious usage, and after the second cavity 3 unseals, it is more convenient to seal to first cavity 1, the effectual current dry wet separation bag of solution is tearing after using, to the problem that the resealing degree of difficulty of bag body itself is high. Meanwhile, the hand-tearing handle 4 is directly formed by processing the packaging outer layer 7 by the cutting mode, and the connecting part of the hand-tearing handle 4 is positioned outside the easy-tearing heat sealing section 22, because the packaging outer layer 7 and the hand-tearing handle 4 are integrally formed, the hand-tearing handle 4 is integrally attached outside the inner packaging bag 6, so that the dry-wet separation bag is free of the external bulge phenomenon, the whole dry-wet separation bag is free of the integral thickness when the hand-tearing handle 4 is increased, and when the easy-tearing heat sealing section 22 is separated, the separation of the easy-tearing heat sealing section 22 can be realized only by directly pinching the hand-tearing handle 4 and pulling out the hand-tearing handle outwards, and the phenomenon that the existing easy-tearing heat sealing section 22 is not easy to separate is effectively solved.
Example 2: in a further improvement of embodiment 1, as shown in fig. 2, a release agent 8 is disposed between the hand-tearing handle 4 and the inner packaging bag 6, and the hand-tearing handle 4 is attached to the inner packaging bag 6 through the release agent 8.
Because form the separation state after cutting between peripheral and the packing external layer 7 of handle 4 to lead to the unable laminating of handle 4 in the lateral surface of wrapping bag 6, cause the uncomfortable sense in outward appearance easily when transportation or production, influence sales and user's experience sense, consequently, the outside of wrapping bag 6 and the region of handle 4 laminating smear one deck release agent 8 when making the bag, thereby make handle 4 laminate on wrapping bag 6 through release agent 8, can make handle 4 and interior wrapping bag 6 closely laminate, and release agent 8's compound back peel strength is 0 ~ 0.8N/15mm, when need pull handle 4 from interior wrapping bag 6 separation, can realize easy separation. Wherein the release agent 8 mainly adopts one of the following components:
1. fluorine-containing release agent 8: it is characterized by that after coating, a solid layer with low surface tension is formed on the film surface, so that the composite glue has no adhesive force on its surface, and its release effect is that its peel strength is 0-0.3N/15 mm after compounding
2. Silicon-containing release agent 8: it is characterized in that an oily layer with low surface tension is formed on the surface of the film after coating, so that the composite glue has no adhesive force on the surface, and the release effect is that the peel strength after the composite is 0-0.5N/15 mm
3. Acrylic release agent 8: the method is characterized in that a solid layer with low adhesive force is formed on the surface of a film after coating, and is easy to peel from the surface of the film to form a release effect, wherein the release effect is that the peel strength after compounding is 0.2-0.8N/15 mm
Example 3: in a further improvement of embodiment 1, as shown in fig. 3, the tear handle 4 and the inner packaging bag 6 are layered naturally, at least one linking point 9 is arranged between the tear handle 4 and the outer packaging layer 7, and the tear handle 4 is attached to the outer packaging bag 6 through the linking point 9.
When the hand tearing handle 4 is cut, the cutting area between the hand tearing handle 4 and the outer packaging layer 7 is connected through 1-3 uncut connecting points 9, so that the hand tearing handle 4 is positioned on the same plane with the outer packaging layer 7 when the connecting points 9 are not disconnected. Therefore, after the inner packaging bag 6 and the outer packaging layer 7 are compounded, the hand tearing handle 4 can be attached to the inner packaging bag 6 under the condition that the release agent 8 is not needed, and the process is simpler and more convenient during production. When adopting natural layering between hand tearing pull handle 4 and the inner packaging bag 6, generally connect through 1~3 tie points 9 between hand tearing pull handle 4 and the packing skin 7 to make hand tearing pull handle 4 paste and take outer the inner packaging bag 6 through tie points 9, when needs use, only need the outside simple knot of hand tearing pull handle 4 to be pulled, just can be the tie point and produce the fracture, thereby make hand tearing pull handle 4 realize easily buckling.
Example 4: in a further improvement on the basis of embodiment 2 or embodiment 3, as shown in fig. 1 to 3, the heat sealing width of the heat sealing section 22 is smaller than the width of the sealing section 21, the heat sealing section 22 includes at least one peak 5 protruding toward the inner side of the first cavity 1 or the second cavity 3, and the connecting portion of the hand-tearing handle 4 is disposed at one side of the peak 5.
In the in-service use, the span of easy tearing heat seal section 22 is less than the width of sealed section 21, can make easy tearing heat seal section 22 more easily separate when receiving tensile tearing, simultaneously, easy tearing heat seal section 22 has and is formed with peak valley structure when the heat seal, and the connecting portion of hand tear handle 4 is located one side of peak 5, can make easy tearing heat seal section 22 realize tearing a bit to the face when receiving tensile, make its separation simpler, simultaneously in tearing the in-process, after easy tearing heat seal section 22 all tears, the same power can't tear sealed section 21 any more, thereby make the tear length control of median 2 more convenient, the effectual current tear structure of having directly tearing whole median 2 direct whole or problem of a large scale, it is more convenient to make the shutoff once more of sealed section 21, only need through a small-size clip just can carry out the pertinence seal.
Example 5: a process for preparing the novel easy-to-tear dry-wet separation bag of example 4, comprising the following steps:
a novel easy-to-tear dry-wet separation bag preparation process comprises the following steps:
s1, manufacturing an inner packaging bag 6 with an inner single side: the inner packaging bag 6 on one side sequentially comprises a barrier layer, an adhesive layer and an easily-uncovered heat sealing layer from outside to inside, and the easily-uncovered heat sealing layer is bonded and attached with the barrier layer by adopting a dry-method compounding process to prepare a compound semi-finished product, namely a single-side inner packaging layer compound film;
s2, manufacturing a packaging outer layer 7: the packaging outer layer 7 sequentially comprises a PET high-strength pull handle layer, an adhesive layer and a printing base film/ink layer from outside to inside, wherein the printing ink layer uses PET and PA as printing base film materials, a printing process is adopted to prepare a printing film, namely the printing base film/ink layer, and the printing base film/ink layer is compounded with the PET high-strength pull handle layer by adopting a dry compounding process to prepare a compound semi-finished product packaging outer layer compound film;
s3, curing the packaging outer layer composite film prepared in the step S2 at a high temperature, and performing cutting or windowing die cutting treatment on a designated position through a positioning die cutting process to form a hand tearing handle 4 with a handle pulling function on the packaging outer layer composite film, wherein the hand tearing handle 4 forms a local point connection or separation structure between a die cutting area and the packaging outer layer composite film after the die cutting treatment;
S4, compounding the packaging outer layer composite film with the hand tearing handle 4 on the inner packaging layer composite film through an adhesive layer, bonding the packaging outer layer composite film and the inner packaging layer composite film by adopting a dry method compounding process, thereby preparing a single-side composite film of the dry-wet separation bag,
when the die cutting area of the hand tearing handle 4 is connected with the outer packaging layer composite film by adopting local points, natural separation is adopted between the hand tearing handle 4 and the inner packaging layer composite film, and the hand tearing handle 4 is attached to the outer side of the inner packaging layer composite film through the connecting points 9;
when a separation structure is adopted between the die cutting area of the hand-tearing handle 4 and the packaging outer layer composite film, the packaging outer layer composite film is coated with a release agent layer, and the hand-tearing handle 4 is attached to the outer side of the inner packaging layer composite film through the release agent layer;
s5, curing the two single-side composite films at high temperature and transferring to a bag making process to manufacture the dry-wet separation bag.
When the dry-wet separation bag is manufactured, the inner packaging bag 6 and the outer packaging layer 7 are manufactured and molded through corresponding automatic compounding equipment, wherein the step S3 is further added in the manufacturing process of the outer packaging layer 7, the outer packaging layer compound film is subjected to cutting or windowing die cutting treatment through the step S3, so that the hand-tearing handle 4 which is integrated with the outer packaging layer compound film is formed, the outer packaging layer compound film is compounded on the inner packaging layer compound film through the adhesive layer through the compounding equipment to form a single-side dry-wet separation bag base surface, and finally the dry-wet separation bag base surface is manufactured into the dry-wet separation bag through the bag manufacturing equipment. The position of the tearing handle 4 close to the easily-torn heat-sealing section 22 of the dry-wet separation bag can be pulled to open the easily-torn heat-sealing section 22 of the dry-wet separation by pulling the tearing handle 4, so that the two cavities are communicated.
In the process of compounding the packaging outer layer composite film and the inner packaging layer composite film, if local point connection is adopted between the die cutting area of the hand tearing handle 4 and the packaging outer layer composite film, an adhesive layer and a release agent layer do not need to be coated outside the inner packaging layer composite film in the corresponding area of the hand tearing handle 4, after compounding, natural separation is adopted between the two layers, and the hand tearing handle 4 can be naturally attached to the outer side of the inner packaging layer composite film through the connecting point 9; when the cutting-off type stripping is adopted between the die cutting area of the hand-tearing handle 4 and the packaging outer layer composite film, the release agent layer is coated on the corresponding stripping area outside the packaging outer layer composite film, so that the hand-tearing handle 4 is attached to the outer side of the inner packaging layer composite film through the release agent layer, and the hand-tearing handle 4 is prevented from being turned outwards, for example: the mode of locally coating the release agent 8 by the positioning of the printing film ensures that the composite film locally forms a low composite strength area, then the shape tangent line of the pull handle is die-cut in the low composite strength area, and finally the pull handle is manufactured on the material at the outer side of the bag.
The hand tearing handle 4 is directly formed in the preparation process of the packaging outer layer composite film, the process change is smaller, the forming can be realized only by adding a die cutting process after the packaging outer layer composite film is formed, the process improvement is simpler, and the problem that the process difficulty is high when the conventional bag making process is used for manufacturing the handle is effectively solved. Meanwhile, when the packaging outer layer 7 is manufactured, PET and PA are used as printing base film materials for the printing ink layer, and a PET high-strength pull handle layer is attached to the outer side of the printing ink layer, so that the pull strength of the hand-tearing pull handle 4 is higher, and the problem that the existing base layer directly used as the hand-tearing pull handle 4 is easy to break or pull and deform is effectively solved. The high-temperature curing is carried out on the prepared packaging outer layer composite film in the step S3, and when the high-temperature curing is carried out on the two single-side composite films in the step S5, the composite film is rolled up into a high-temperature drying room, so that the glue undergoes a crosslinking reaction, the high-temperature curing temperature is generally 40-50 ℃, when the hand tearing handle 4 is produced and molded in a die cutting mode, the notch is smoother, the molding is more convenient, the process is simpler, the problems of complex handle manufacturing process, high manufacturing cost and low efficiency are effectively solved, and the packaging outer layer 7 can be manufactured in an automatic assembly line in the manufacturing process.
After the preparation process is adopted, the problems that the existing pull ring outside the dry-wet separation bag is high in cost, high in manufacturing difficulty, high in process requirement and low in production efficiency, automatic production is difficult to form, a large number of manual pull rings are needed, the overall thickness of the dry-wet separation bag is increased, and therefore packaging cost is increased are effectively solved.
Example 6: the heat sealing pressure of the easy-uncovering heat sealing section 22 is 0.1-0.5 MPa, the heat sealing temperature is 150+/-30 ℃, and the heat sealing strength is 5+/-2N/15 mm; the heat sealing pressure of the sealing section 21 and the outside sealing edge in the dry-wet separation bag is 0.2-0.8 MPa, the heat sealing temperature is 200+/-20 ℃, and the heat sealing strength is 12+/-3N/15 mm.
The heat sealing pressure of the easy-tearing heat sealing section 22 is generally between 0.1 and 0.5MPa, the pressure during heat sealing is larger, the strength after heat sealing is higher, for example, when the heat sealing pressure is between 0.1 and 0.2MP, the heat sealing strength is generally 3N/15mm, when the heat sealing strength is between 0.5MP, the heat sealing strength can reach 6 to 7N/15mm, the actual condition is adjusted according to the width of the easy-tearing heat sealing section 22, when the width of the easy-tearing heat sealing section 22 is larger, the required heat sealing pressure can be smaller, meanwhile, the temperature is controlled to be 150+/-30 ℃, the heat sealing section 22 can realize heat sealing, the situation that the heat sealing strength is too large to be torn easily can be avoided when the heat sealing is carried out, the heat sealing parameters of the sealing section 21 and the outer sealing edge in the dry-wet separation bag are consistent, the firmness of the sealing section 21 and the outer sealing edge in the dry-wet separation bag is enabled to be consistent, the process is simpler, the heat sealing pressure of the sealing section 21 and the outer sealing edge in the process is 0.5-0.8 MPa, the required heat sealing pressure can be smaller, the temperature is controlled to be 150+/-30 ℃, the temperature is enabled to be equal to the temperature of the whole sealing section 22 and the temperature is not torn easily, and is 20 mm, the temperature is not equal to the whole sealing strength is 20.2 mm, and the temperature is guaranteed to be the temperature is not equal to the whole and the sealing strength is 20.2 mm, and the sealing strength is not torn when the whole is 20.2.
Wherein, the heat-seal pressure, temperature and intensity of the easy-to-uncover heat-seal section 22 are all lower than the heat-seal pressure, temperature and intensity of the sealing section 21 and the outside sealing edge in the dry-wet separation bag, so that the easy-to-uncover heat-seal section 22 is resistant to be separated more easily when being torn by the hand-tearing pull ring, and meanwhile, the pressure-resistant intensity of the easy-to-uncover heat-seal section 22 after heat sealing is not broken under the pressure of 40kg, so that liquid is not easy to leak.
Further modified on the basis of the embodiment 5, the barrier layer adopts one of aluminum foil, aluminized film or aluminum oxide coating film. The inner bag 6 can be provided with good high barrier properties and sealing properties.
In a further improvement of the embodiment 5, the PET high-strength pull handle layer is made of a high-strength PET film, the thickness of the PET high-strength pull handle layer is 12-60 mu, and the thickness of the easy-to-tear heat seal layer is 40-120 mu.
The PET high strength draws the layer to adopt high strength PET membrane, can make the thickness of whole dry and wet separation bag thinner simultaneously, guarantees that the tensile strength of hand tearing draw handle 4 is higher, and the hand tearing draws handle 4 to be difficult for appearing tearing.
Example 7: the heat-sealing layer film for the novel easy-to-tear dry-wet separation bag comprises the following components of polyethylene, polyethylene-vinyl acrylate and polyethylene-acrylic resin, wherein the inner packaging bag film is produced by adopting a five-layer coextrusion film blowing process, the first three layers of the inner packaging bag film are polyethylene resins, the fourth layer of the inner packaging bag film is a mixture of polyethylene and polyethylene-acrylic resin, the ratio of the polyethylene to the polyethylene-acrylic resin is 1:1, the fifth layer of the inner packaging bag film is a mixture of polyethylene and polyethylene-vinyl acrylate, and the ratio of the polyethylene to the polyethylene-vinyl acrylate is 1:4.
Since the conventional heat-seal layer film is not easy to form the stable heat-seal section 22 when used as the heat-seal layer of the inner bag 6 in example 6, the heat-seal layer film was improved in that the first three layers were made of a mixture of low density polyethylene and linear low density polyethylene, for example, by mixing low density polyethylene (2420H) with linear low density polyethylene (0220 AA), and the heat-seal layer film was able to effectively improve the overall strength by the first three layers. Meanwhile, a high-strength heat seal film layer with high viscosity can be formed through the fourth layer, and a bottom strength heat seal film layer with a viscous bottom can be formed through the fifth layer, so that a heat seal layer film can form a double platform with stable heat seal strength through the fourth layer and the fifth layer, after being bonded through the fifth layer with low heat seal strength, a low heat seal platform can be formed, so that the easily-torn heat seal sections 22 are easier to separate, and when the fourth layer with high heat seal strength is bonded with each other, a high heat seal platform is formed between the bags, so that the bags form heat seal edges for sealing all sides and the sealing sections 21, and the heat seal strength of a sealing area can be more stable through the fourth layer. The specific heat sealing method is as follows:
When the heat seal strength requirement is lower, for convenient subsequent separation, only need set up the back through heat sealing equipment to temperature and pressure, make the fifth layer between two heat seal layer films produce and bond each other, just can realize the effect of end heat seal strength, and when the heat seal strength requirement is higher, for convenient assurance connection's fastness, only need set up the back through heat sealing equipment to temperature and pressure, make fourth layer and the fifth layer between two heat seal layer films all produce and bond each other, just can realize the effect of high heat seal strength. For example: the low heat-seal strength platform mainly provides heat-seal strength by fifth layer resin, adopts a heat-seal process with heat-seal pressure of 0.1-0.5 MPa and heat-seal temperature of 150+/-30 ℃ and heat-seal strength of 5+/-2N/15 mm; the high heat sealing strength platform mainly provides heat sealing strength by the fourth layer of resin, adopts a heat sealing process with heat sealing pressure of 0.2-0.8 MPa and heat sealing temperature of 200+/-20 ℃, and has heat sealing strength of 12+/-3N/15 mm. The fourth layer is a mixture of polyethylene and polyethylene-acrylic acid resin, the ratio of the polyethylene to the polyethylene-acrylic acid resin is 1:1, the fifth layer is a mixture of polyethylene and polyethylene-vinyl acrylate, and the ratio of the polyethylene to the polyethylene-vinyl acrylate is 1:4, can make the heat-seal effect of heat-seal layer film more stable, when heat-seal temperature and pressure unanimous, can make the intensity fluctuation after the twice heat-seal smaller, effectually solved the problem that current heat-seal layer film can't realize forming the easy heat-seal section 22 of taking off that the seal section 21 of high bond strength and bottom intensity bond through the heat-seal layer directly on the same median 2.
In addition, the embodiment 7 is further improved in that when the heat-seal layer film is produced, the five-layer coextrusion film blowing process is adopted to produce the easily-torn heat-seal layer, the process is simpler, and the specific steps include:
step 1, five layers of resin forming the easy-to-uncover heat seal layer are respectively fed, mixed, melted and extruded by adopting independent five screws;
step 2, five layers of extruded molten resin enter a die head through a runner, so that the molten resin in the die head is stacked in five layers from outside to inside;
step 3, uniformly extruding five layers of stacked resin from a die opening of a die head, transversely blowing and longitudinally stretching to enable the thickness of the film to reach a required thickness range, and cooling by adopting an internal circulation cooling system and an external blowing cooling system to obtain the heat-sealing layer film;
step 4, carrying out surface treatment on the cooled heat-sealing layer film by an online corona machine to ensure that the surface tension of a corona surface is more than or equal to 38dyn;
and 5, cutting into the required width and winding.
In the process of manufacturing the easily uncovered heat sealing layer through five-layer coextrusion film blowing process, five layers of resin forming each layer are fed, mixed, melted and extruded through five independent screws, so that the extruded materials of each layer enter a die head through a runner to form a corona layer, a bonding layer, a middle layer, a high heat sealing strength layer and a bottom heat sealing strength layer from outside to inside in sequence, wherein the corona layer, the bonding layer and the middle layer are formed by hot melting a mixture of low-density polyethylene and linear low-density polyethylene, and the integral strength and the sealing property of the heat sealing layer film are better improved while a stable base surface is formed for the high heat sealing strength layer. After uniformly extruding five layers of stacked resin from a die opening of a die head, transversely blowing and longitudinally stretching to ensure that the thickness of the film reaches the required thickness range, and cooling by adopting an internal circulation cooling system and an external blowing cooling system to prepare the heat-sealing layer film; finally, carrying out surface treatment on the cooled heat-sealing layer film by an online corona machine to ensure that the surface tension of a corona surface is more than or equal to 38dyn; then cutting into required width and rolling for the subsequent bag making process.
The embodiments of the present invention are all preferred embodiments of the present invention, and are not intended to limit the scope of the present invention in this way, therefore: all equivalent changes in structure, shape and principle of the invention should be covered in the scope of protection of the invention.

Claims (10)

1. A novel easy-to-uncover dry-wet separation bag preparation process is characterized in that: the method comprises the following steps:
s1, manufacturing an inner packaging bag (6) with an inner single side: the inner packaging bag (6) on one side sequentially comprises a barrier layer, an adhesive layer and an easily-uncovered heat sealing layer from outside to inside, and the easily-uncovered heat sealing layer is bonded and attached with the barrier layer by adopting a dry-method compounding process to prepare a compound semi-finished product, namely the composite film on the inner packaging layer on one side;
s2, manufacturing a packaging outer layer (7): the packaging outer layer (7) sequentially comprises a PET high-strength pull handle layer, an adhesive layer and a printing base film/ink layer from outside to inside, wherein the printing base film/ink layer is made of PET and PA serving as printing base film materials, a printing process is adopted to prepare a printing film, and the printing base film/ink layer is compounded with the PET high-strength pull handle layer by adopting a dry compounding process to prepare a compound semi-finished product packaging outer layer compound film;
s3, curing the packaging outer layer composite film prepared in the step S2 at a high temperature, and performing cutting or windowing die cutting treatment on a designated position through a positioning die cutting process to form a hand tearing handle (4) with a handle pulling function on the packaging outer layer composite film, wherein the hand tearing handle (4) forms a local point connection or separation structure between a die cutting area and the packaging outer layer composite film after the die cutting treatment;
S4, compounding the packaging outer layer composite film with the hand tearing handle (4) on the inner packaging layer composite film through an adhesive layer, bonding the packaging outer layer composite film and the inner packaging layer composite film by adopting a dry compounding process, thereby preparing a single-side composite film of the dry-wet separation bag,
when the die cutting area of the hand tearing handle (4) is connected with the outer packaging layer composite film by adopting local points, natural separation is adopted between the hand tearing handle (4) and the inner packaging layer composite film, at least one connecting point (9) is arranged between the hand tearing handle (4) and the outer packaging layer (7), and the hand tearing handle (4) is attached to the outer side of the inner packaging layer composite film through the connecting point (9);
when a separation structure is adopted between the die cutting area of the hand tearing handle (4) and the packaging outer layer composite film, the packaging outer layer composite film is coated with a release agent layer, and the hand tearing handle (4) is attached to the outer side of the inner packaging layer composite film through the release agent layer;
s5, curing the two single-side composite films at high temperature, and transferring to a bag making process to manufacture the dry-wet separation bag.
2. The process for preparing the novel easy-to-tear dry-wet separation bag according to claim 1, which is characterized in that: the easy-to-uncover heat sealing layer is a separation belt (2) for separating the inner packaging bag (6) to form a first cavity (1) and a second cavity (3), the separation belt (2) comprises a sealing section (21) and an easy-to-uncover heat sealing section (22), the heat sealing pressure of the easy-to-uncover heat sealing section (22) is 0.1-0.5 MPa, the heat sealing temperature is 150+/-30 ℃, and the heat sealing strength is 5+/-2N/15 mm; the heat sealing pressure of the sealing section (21) and the outer sealing edge in the dry-wet separation bag is 0.2-0.8 MPa, the heat sealing temperature is 200+/-20 ℃, and the heat sealing strength is 12+/-3N/15 mm.
3. The process for preparing the novel easy-to-tear dry-wet separation bag according to claim 1, which is characterized in that: the barrier layer adopts one of aluminum foil, aluminizer or alumina coating.
4. The process for preparing the novel easy-to-tear dry-wet separation bag according to claim 1, which is characterized in that: the PET high-strength pull handle layer is made of a high-strength PET film, the thickness of the PET high-strength pull handle layer is 12-60 mu, and the thickness of the easily-torn heat seal layer is 40-120 mu.
5. The process for preparing the novel easy-to-tear dry-wet separation bag according to claim 1, which is characterized in that: the composition of the easy-to-tear heat seal layer comprises polyethylene, polyethylene-vinyl acrylate and polyethylene-acrylic resin, wherein the inner packaging bag film is produced by adopting a five-layer coextrusion film blowing process, the first three layers of the inner packaging bag film are polyethylene resins, the fourth layer of the inner packaging bag film is a mixture of polyethylene and polyethylene-acrylic resin, the ratio of polyethylene to polyethylene-acrylic resin is 1:1, the fifth layer of the inner packaging bag film is a mixture of polyethylene and polyethylene-vinyl acrylate, and the ratio of polyethylene to polyethylene-vinyl acrylate is 1:4.
6. The process for preparing the novel easy-to-tear dry-wet separation bag according to claim 5, which is characterized in that: when the five-layer coextrusion film blowing process is adopted to manufacture the easily uncovered heat sealing layer, the process comprises the following steps:
step 1, five layers of resin forming the easy-to-uncover heat seal layer are respectively fed, mixed, melted and extruded by adopting independent five screws;
step 2, five layers of molten resin extruded through the runner enter a die head, so that the molten resin in the die head is stacked in five layers from outside to inside;
step 3, uniformly extruding five layers of stacked resin from a die opening of a die head, transversely blowing and longitudinally stretching to enable the thickness of the film to reach a required thickness range, and cooling by adopting an internal circulation cooling system and an external blowing cooling system to obtain a heat-sealing layer film;
step 4, carrying out surface treatment on the cooled heat-sealing layer film by an online corona machine to ensure that the surface tension of a corona surface is more than or equal to 38dyn;
and 5, cutting into the required width and winding.
7. The novel easy-to-tear dry-wet separation bag prepared by the preparation process according to claim 1 comprises an inner packaging bag (6) and a packaging outer layer (7) arranged on the outer side of the inner packaging bag (6), wherein a separation belt (2) is arranged in the inner packaging bag (6), and the inner packaging bag (6) is separated by the separation belt (2) to form a first cavity (1) and a second cavity (3), and is characterized in that: the isolation belt (2) comprises a sealing section (21) and a heat seal section (22) which is easy to uncover, wherein both sides of the heat seal section (22) are respectively provided with a tearing handle (4) which can outwards extend, the tearing handles (4) are cut and formed through the outer packaging layer (7), the tearing handles (4) and the connecting parts of the outer packaging layer (7) are arranged on the outer side of the heat seal section (22) which is easy to uncover, the heat seal section (22) is easy to uncover, the tearing handles (4) on both sides are outwards stretched to generate separation, and the first cavity (1) and the second cavity (3) are communicated through the separated heat seal section (22) which is easy to uncover.
8. The novel easy-to-tear dry-wet separation bag according to claim 7, wherein: the release agent (8) is arranged between the hand tearing handle (4) and the inner packaging bag (6), and the hand tearing handle (4) is attached to the inner packaging bag (6) through the release agent (8).
9. The novel easy-to-tear dry-wet separation bag according to claim 7, wherein: the inner packaging bag is characterized in that the inner packaging bag (6) is layered naturally, at least one linking point (9) is arranged between the inner packaging bag (6) and the outer packaging bag layer (7), and the inner packaging bag (6) is attached to the inner packaging bag through the linking point (9) by the aid of the inner packaging bag (4).
10. The novel easy-to-tear dry-wet separation bag according to claim 8, wherein: the heat sealing width of the easy-tearing heat sealing section (22) is smaller than the width of the sealing section (21), the easy-tearing heat sealing section (22) at least comprises a peak (5) protruding towards the inner side of the first cavity (1) or the second cavity (3), and the connecting part of the hand-tearing handle (4) is arranged on one side of the peak (5).
CN202210880557.3A 2022-07-25 2022-07-25 Novel easy-to-uncover dry-wet separation bag, preparation process and heat-sealing layer film Active CN115417007B (en)

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