CN112356475B - Production process of slider type sealing bag sealing strip, jig and extrusion equipment thereof - Google Patents

Production process of slider type sealing bag sealing strip, jig and extrusion equipment thereof Download PDF

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CN112356475B
CN112356475B CN202011416415.9A CN202011416415A CN112356475B CN 112356475 B CN112356475 B CN 112356475B CN 202011416415 A CN202011416415 A CN 202011416415A CN 112356475 B CN112356475 B CN 112356475B
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cavity
jig
polyethylene
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density polyethylene
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CN112356475A (en
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龚立锋
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Deqing Sunny Plastic Products Co Ltd
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Deqing Sunny Plastic Products Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D99/00—Subject matter not provided for in other groups of this subclass
    • B29D99/0053—Producing sealings
    • 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
    • B29C48/001—Combinations of extrusion moulding with other shaping operations
    • B29C48/0021—Combinations of extrusion moulding with other shaping operations combined with joining, lining or laminating
    • 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
    • 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
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/30—Extrusion nozzles or dies
    • 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
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/49—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using two or more extruders to feed one die or nozzle
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/04—Homopolymers or copolymers of ethene
    • C08L23/06—Polyethene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2201/00—Properties
    • C08L2201/10—Transparent films; Clear coatings; Transparent materials
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
    • C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
    • C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2207/00—Properties characterising the ingredient of the composition
    • C08L2207/06—Properties of polyethylene
    • C08L2207/062—HDPE
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2207/00—Properties characterising the ingredient of the composition
    • C08L2207/06—Properties of polyethylene
    • C08L2207/066—LDPE (radical process)

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Bag Frames (AREA)

Abstract

The invention discloses a production process of a slider type sealing bag sealing strip, a jig and extrusion equipment thereof, and the process comprises the following steps: mixing non-linear low density polyethylene, a first class of metallocene polyethylene, a second class of metallocene polyethylene and high density polyethylene to form a first mixture; mixing a non-linear low density polyethylene and a linear low density polyethylene into a second mixture; heating the two mixtures and the four types of metallocene polyethylene into melts, respectively adding the two mixtures into a first cavity of a jig through extrusion equipment, adding the four types of metallocene polyethylene into a second cavity of the jig, and converging the three melts in a discharge cavity of the jig to form a preformed clip chain attached with the four types of metallocene polyethylene on one side of the ribs and leaves; and then cooling and reducing to obtain a finished product clamping chain, and using a chain combining machine to combine the chain to obtain the sealing strip. The sealing strip produced by the production process has high strength, strong tensile strength and excellent performance in sealing bag application.

Description

Production process of sliding block type sealing bag sealing strip, jig and extrusion equipment thereof
Technical Field
The invention relates to the technical field of plastic production and manufacturing, in particular to a production process of a slider type sealing bag sealing strip, a jig and extrusion equipment thereof.
Background
The slider type sealing bag is a common sealing bag which is convenient to open and close, is widely applied to various fields of object sealing, food preservation and the like, and can prevent the sealed object from being influenced by external dirt or moisture and the like.
In the current production process of the sealing bag, the material of the sealing strip mainly has two forms, one is a single material, and the mode usually causes the performance of the sealing strip to be too single and cannot well take into account all performance requirements of the sealing bag. And the other method adopts a mixture, namely, after a plurality of materials are mixed, the mixture is extruded and plasticized by an extruding device to form the sealing strip, the performance of the sealing strip produced by the method is superior to that of the sealing strip made of a single material to a certain extent, but the performance of each part of the produced sealing strip is almost consistent because all the materials are mixed and then extruded and plasticized, and therefore, all the requirements of the sealing bag cannot be well met. For example, the sealing strip has to be stiff, and the strips have to be tough and tear resistant, and at the same time suitable for low temperature applications, which cannot be met by single materials or mixed materials.
The intensity of current production technology production sealing strip is not enough, tensile bearing capacity in horizontal ascending is less than 3 pounds, tensile bearing capacity in perpendicular ascending is less than 5 pounds, and the bone strip is softer, bone strip leaf toughness is not enough, required laminating temperature is higher when the sealing strip is laminating with the sealing bag body, this will lead to especially bag body film through tensile, after high temperature laminating cooling, bag body film can shrink deformation, lead to the sealing strip to receive the influence of film shrink to become curved, the bag body takes place the fold, thereby influence the outward appearance, still take place to tear in laminating department easily when serious, lead to forming the defective products. In addition, due to the limitation of the existing production process formula, when equipment is produced for about three hours, a mold needs to be cleaned, otherwise, coke materials at the edge of the mold are easy to adhere to the sealing strip, so that a defective product is formed, the continuous production time is short, and the production efficiency is low.
Therefore, in combination with the above-mentioned technical problems, a new technical solution is needed.
Disclosure of Invention
The invention aims to provide a production process of a slider type sealing bag sealing strip, which can obtain the sealing strip with excellent characteristics, fuses a mixture of two specific materials in proportion to form a clip chain of the sealing strip by using a jig and an extrusion device, and coats a layer of low-temperature material on bone strip leaves of the clip chain to ensure that the bone strip leaves of the sealing strip can be bonded with a bag body of the sealing bag at low temperature during production of the sealing bag, so that the shrinkage degree of the bag body is reduced, the bonded sealing strip is basically in a straight state, and the sealing bag is more attractive. The specific scheme is as follows:
according to one aspect of the invention, the invention provides a production process of a slider type sealing bag sealing strip, which comprises the following steps: step S1: mixing non-linear low-density polyethylene, first-class metallocene polyethylene, second-class metallocene polyethylene and high-density polyethylene according to a set weight ratio to obtain a first mixture for forming the chain clamping bone strip; mixing nonlinear low-density polyethylene, linear low-density polyethylene and three types of metallocene polyethylene according to a set weight ratio to obtain a second mixture for forming the leaves of the chain clamping strips; step S2: respectively heating the first mixture, the second mixture and the four types of metallocene polyethylene by using an extrusion device to form melts; step S3: respectively adding the first mixture and the second mixture into a first cavity of a jig through the extrusion equipment, adding the four types of metallocene polyethylene into a second cavity of the jig, and converging the three types of melts in a discharge cavity of the jig to form a preformed clip chain attached with the four types of metallocene polyethylene at one side of the bone strip leaves; step S4: drawing the preformed clip chain formed in the step S3 into a cooling device through a drawing device for cooling to form a semi-finished clip chain; step S5: placing the semi-finished product clip chain obtained in the step S4 in a space with a set temperature for a set time to form a finished product clip chain; step S6: using a chain combining machine to combine the chains to form a finished sealing strip;
wherein the melt index range of the nonlinear low density polyethylene is 2-5g/10 min; the melt index range of the linear low-density polyethylene is 0.5-2.5g/10 min; the melt index range of the metallocene polyethylene is 0.2-1.2g/10 min; the melt index range of the second metallocene polyethylene is 3-5g/10 min; the melt index range of the high-density polyethylene is 0.5-1g/10 min; the melt index range of the three types of metallocene polyethylene is 0.2-5g/10 min; the melt index range of the four types of metallocene polyethylene is 0.5-2.5g/10 min;
the density range of the metallocene polyethylene is 0.93-0.95g/m3(ii) a The density of the second metallocene polyethylene is 0.93-0.95g/m3(ii) a The density of the three types of metallocene polyethylene ranges from 0.85 to 0.95g/m3(ii) a The density of the four types of metallocene polyethylene ranges from 0.91 to 0.92g/m3；
The first mixture comprises the following components in parts by weight: non-linear low density polyethylene: 35% -42%, linear low density polyethylene: 10% -15%, a metallocene polyethylene: 5% -9%, metallocene polyethylene of two types: 20% -30%, high density polyethylene: 10% -15%; the second mixture comprises the following components in parts by weight: non-linear low density polyethylene: 40% -60%, linear low density polyethylene: 10% -20%, three types of metallocene polyethylene: 30 to 40 percent.
Further, the first mixture comprises the following components in parts by weight: non-linear low density polyethylene: 39% -41%, linear low density polyethylene: 13% -14%, a metallocene polyethylene: 6% -7%, metallocene polyethylene of two types: 26% -27%, high density polyethylene: 13% -14%; the second mixture comprises the following components in parts by weight: non-linear low density polyethylene: 49% -51%, linear low density polyethylene: 16% -17%, three types of metallocene polyethylene: 33 to 34 percent.
Further, the cooling device used in step S4 is a constant temperature water tank, the pre-formed clip chain is pulled into the constant temperature water tank by a pulling device for cooling, the temperature of the cooling water in the constant temperature water tank is 26-30 ℃, and the clip chains with different sizes are obtained by controlling the pulling speed of the pulling device, the extruding speed of the extruding device and the liquid level height of the cooling water in the constant temperature water tank; in step S6, when the zipper is closed by the zipper closing machine, the side of the four types of metallocene polyethylene provided on the framework leaves of the two types of zipper is respectively directed to the outer side of the sealing strip.
According to another aspect of the invention, the invention further provides a jig for the slider type sealing bag sealing strip, which is applied to the production process of the slider type sealing bag sealing strip, the jig is of a plate-shaped structure and is provided with a first side surface and a second side surface, the jig is respectively provided with two groups of cavities penetrating through the first side surface and the second side surface along the thickness direction of the jig, each group of cavities comprises a first cavity with a set shape and a second cavity with a set shape, the first cavity and the second cavity respectively penetrate through the first side surface, the first cavity and the second cavity are communicated in the jig to form a discharging cavity, and the discharging cavity penetrates through the second side surface of the jig.
Further, first die cavity includes bone strip chamber and bone strip leaf chamber, bone strip leaf chamber with bone strip chamber intercommunication, the second die cavity is located one side of bone strip leaf chamber, the second die cavity with bone strip leaf chamber intercommunication.
According to another aspect of the invention, the invention also provides extrusion equipment of the slider type sealing bag sealing strip, which is applied to the production process of the slider type sealing bag sealing strip, and the extrusion equipment comprises a die head, and a first extrusion unit, a second extrusion unit and a third extrusion unit which are respectively communicated with the die head, wherein each extrusion unit comprises an extrusion device, the extrusion device comprises a barrel and a screw rod arranged in the barrel, the barrel is provided with a feeding port and a discharging port, the screw rod can heat the material in the barrel, and the screw rod can be driven to rotate in the barrel so as to extrude the material in the barrel from the discharging port into the die head.
Furthermore, two groups of discharging cavities are respectively arranged on the die head, the discharging cavities are respectively communicated with the outside of the die head, each group of discharging cavities comprises a first discharging cavity, a second discharging cavity and a third discharging cavity, the first extruding unit is communicated with the first discharging cavity, the second extruding unit is communicated with the second discharging cavity, and the third extruding unit is communicated with the third discharging cavity; each extrusion unit also comprises at least one heating device, and a discharge hole of the extrusion device is communicated with a discharge cavity in the die head through the heating device.
Compared with the prior art, the production process of the sliding block type sealing bag sealing strip has one or more of the following beneficial effects:
(1) the sealing strip produced by the production process of the sliding block type sealing bag sealing strip can bear more than 7 pounds of tensile force in the opening direction or the closing direction, namely, the welding parts at two sides of the sealing strip have stronger transverse tensile force bearing capacity compared with the prior art;
(2) the bearing capacity of the sealing strip produced by the production process of the sliding block type sealing bag sealing strip in the vertical direction is more than 10 pounds;
(3) the sealing strip produced by the production process of the sliding block type sealing bag sealing strip has excellent sealing property, does not leak water, and does not leak water;
(4) according to the sealing strip produced by the production process of the sliding block type sealing bag, when the sealing bag is produced, no matter the bag body attached to the ribs and leaves is a thin film or a thick film, the attached part is not easy to tear;
(5) according to the production process of the slider type sealing bag sealing strip, the material formula is improved, the performance of mixed materials is more excellent, equipment can continuously produce for more than six hours, and the yield is higher;
(6) when the sealing strip produced by the production process of the sliding block type sealing bag sealing strip is used for producing the sealing bag, compared with the prior art, the transparency and the stiffness of the bag body with the same thickness are more transparent and stiffer;
(7) through the sealing strip of the production technology production of slider formula sealing bag sealing strip of this application, when producing the sealing bag, the laminating temperature of heat laminating sword compares prior art lower, when laminating bag body and bone strip leaf, and the shrink degree of the bag body is lower, and the sealing strip after the laminating is straight state basically.
Drawings
FIG. 1 is a schematic diagram of a part of the structure of an extrusion apparatus used in a production process provided in an embodiment of the present application;
fig. 2 is a schematic structural diagram of an extruding device used in a production process provided in an embodiment of the present application in a top view direction;
fig. 3 is a schematic structural diagram of an extruding device used in a production process provided by an embodiment of the present application in a front view direction;
fig. 4 is a schematic structural diagram of a screw rod in an extrusion device used in the production process provided in the embodiment of the present application;
fig. 5 is a schematic structural diagram of an extruding device used in the production process according to an embodiment of the present application in a side view direction;
FIG. 6 is a schematic structural view of a die head used in the production process provided in the examples of the present application, viewed from the bottom;
fig. 7 is a schematic structural view of a jig used in the manufacturing process according to an embodiment of the present disclosure in a top view direction;
fig. 8 is a schematic structural view of a jig used in the manufacturing process according to the embodiment of the present application in a bottom view direction;
FIG. 9 is a schematic cross-sectional view taken at A in FIG. 7;
fig. 10 is a schematic partial structural view of a slider type sealed bag according to an embodiment of the present application.
Wherein, 1-clip chain, 11-bone strip, 12-bone strip leaf, 2-slide block, 3-bag body, 4-four types of metallocene polyethylene layer, 5-extrusion device, 51-first extrusion unit, 52-second extrusion unit, 53-third extrusion unit, 54-extrusion device, 541-material barrel, 5411-material inlet, 5412-material outlet, 542-screw rod, 55-die head, 551-first material outlet cavity, 552-second material outlet cavity, 553-third material outlet cavity, 554-positioning pin, 56-heating device, 6-jig, 61-first side surface, 62-second side surface, 63-first die cavity, 631-bone strip cavity, 632-bone strip leaf cavity, 64-second die cavity and 65-material outlet cavity, 66-positioning hole, 67-fixing hole.
Detailed Description
To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined objects, the following detailed description of the embodiments, structures, characteristics and effects according to the present invention will be made with reference to the accompanying drawings and preferred embodiments.
Referring to fig. 1 to 10, fig. 1 is a schematic structural diagram of a portion of an extrusion apparatus used in a production process according to an embodiment of the present application; fig. 2 is a schematic structural diagram of an extruding device used in a production process provided in an embodiment of the present application in a top view direction; fig. 3 is a schematic structural diagram of an extruding device used in the production process provided by the embodiment of the present application in a front view direction; fig. 4 is a schematic structural diagram of a screw in an extruding device used in the production process according to an embodiment of the present application; fig. 5 is a schematic structural diagram of an extruding device used in the production process provided by the embodiment of the present application in a side view direction; FIG. 6 is a schematic structural view of a die head used in the production process provided in the examples of the present application, viewed from the bottom; fig. 7 is a schematic structural diagram of a jig used in the manufacturing process according to an embodiment of the present application in a top view direction; fig. 8 is a schematic structural view of a jig used in the manufacturing process according to an embodiment of the present disclosure in a bottom view; FIG. 9 is a cross-sectional view of the structure at A in FIG. 7; fig. 10 is a partial structural schematic view of a slider type sealed bag provided in an embodiment of the present application.
In order to better show the position relationship between the die head and each cavity on the jig, the bottom views shown in fig. 6 and 8 are mirror images.
Examples
The embodiment provides a production process of a slider type sealing bag sealing strip, which comprises the following steps:
step S1: mixing non-linear low-density polyethylene, metallocene polyethylene and high-density polyethylene according to a set weight ratio to obtain a first mixture for forming the bone strips 11 of the clip chain 1. Mixing the nonlinear low density polyethylene, the linear low density polyethylene and the three types of metallocene polyethylene according to a set weight ratio to obtain a second mixture for forming the bone strip 12 of the clip chain 1.
The melt index range of the nonlinear low density polyethylene is 2-5g/10 min; the melt index range of the linear low density polyethylene is 0.5-2.5g/10 min; the melt index range of the metallocene polyethylene is 0.2-1.2g/10 min; the melt index range of the second metallocene polyethylene is 3-5g/10 min; the melt index range of the high-density polyethylene is 0.5-1g/10 min; the melt index range of the three types of metallocene polyethylene is 0.2-5g/10 min. The density range of the metallocene polyethylene is 0.93-0.95g/m3(ii) a The density of the second metallocene-catalyzed polyethylene is in the range of 0.93 to 0.95g/m3(ii) a The density of the three types of metallocene polyethylene ranges from 0.85 to 0.95g/m3. Preferably, the nonlinear low density polyethylene is a non-linear polyethylene of type C150Y produced by Petlin corporationLinear low density polyethylene having a density of 0.921g/m3The melt index is 5g/10 min. The linear low density polyethylene was a 218W type linear low density polyethylene manufactured by Sabic, Inc. and having a density of 0.918g/m3The melt index is 2g/10 min. The metallocene polyethylene and the metallocene polyethylene of the third type are 4009 type metallocene polyethylene produced by ExxonMobil company, and the density of the metallocene polyethylene and the metallocene polyethylene of the third type is 0.94g/m3The melt index was 0.9g/10 min. The metallocene-type polyethylene II is 4536 type metallocene polyethylene produced by ExxonMobil, and the density of the metallocene-type polyethylene II is 0.936g/m3The melt index was 4.5g/10 min. The high density polyethylene is HTA108 type high density polyethylene produced by ExxonMobil company or F04660 type high density polyethylene produced by Sabic company, and the density of the high density polyethylene is 0.961g/m3The melt index was 0.7g/10 min.
Wherein the density characteristics of the materials are as follows: the higher the density, the stiffer and harder the hand feeling of the finished product, and the harder and harder the finished product is, the less the finished product is bent or deformed; the melt index characteristics of each material are as follows: the higher the melt index, the better the fluidity, and the easier the molding, but the scorch and the formation of scorched particles are likely to occur. Of course, the selection of the material grades is only a preferred embodiment, and other types of materials can be adopted, for example, in the second mixture, the nonlinear low-density polyethylene can also be C125Y type nonlinear low-density polyethylene produced by Petlin company, and the density of the nonlinear low-density polyethylene is 0.921g/m3The melt index is 2.5g/10min, and for example, in the second mixture, the third metallocene polyethylene can also be a metallocene polyethylene type 8315 produced by the company Sabic and having a density of 0.915g/m3The melt index is 3g/10 min. The purpose of selecting the above parameter materials is mainly to enable the bone strip 11 part of the sealing strip clip chain 1 obtained through the production process of the application to be hard enough and stiff enough, the tear strength of the bone strip leaf 12 part of the clip chain 1 to be strong enough, and the material attached to one side of the bone strip leaf 12 can be suitable for low-temperature fitting.
When mixing materials, the first mixture comprises the following components in parts by weight: non-linear low density polyethylene: 35% -42%, linear low density polyethylene: 10% -15%, a metallocene polyethylene: 5% -9%, metallocene polyethylene of two types: 20% -30%, high density polyethylene: 10 to 15 percent. Preferably, the first mixture comprises the following components in parts by weight: non-linear low density polyethylene: 39% -41%, linear low density polyethylene: 13% -14%, a metallocene polyethylene: 6% -7%, metallocene polyethylene of two types: 26% -27%, high density polyethylene: 13 to 14 percent. Wherein, the most preferable mixture ratio is as follows: non-linear low density polyethylene: 40%, linear low density polyethylene: 13.3%, a class of metallocene polyethylenes: 6.7%, metallocene polyethylene of two types: 26.7%, high density polyethylene: 13.3 percent. The second mixture comprises the following components in parts by weight: non-linear low density polyethylene: 40% -60%, linear low density polyethylene: 10% -20%, three types of metallocene polyethylene: 30 to 40 percent. Preferably, the second mixture comprises the following components in parts by weight: non-linear low density polyethylene: 49% -51%, linear low density polyethylene: 16% -17%, three types of metallocene polyethylene: 33 to 34 percent. Wherein, the most preferable proportion is as follows: non-linear low density polyethylene: 50%, linear low density polyethylene: 16.7%, three types of metallocene polyethylene: 33.3 percent.
When mixing materials, respectively adding the required different materials into a mixer according to a set weight ratio for uniform stirring, so that the materials are uniformly mixed to obtain a mixture. If the water content in the material is lower than 16%, uniformly stirring the material for 25-30min at the stirring speed of 960 r/min. Of course, the stirring time and speed are only preferred, and can be adjusted according to the total amount of the stirred materials in specific implementation. If the water content in the material is higher than 16%, the material needs to be dried before mixing, the drying temperature is 60-80 ℃, and the drying time is 45-60 min. Certainly, the materials can also be stirred and dried at the same time, and the materials are stirred at a constant speed of 960r/min for 45-60min at the temperature of 60-80 ℃. Again, this stirring time and speed are only preferred and may be adjusted in practice depending on the total amount of material being stirred. Through controlling the water content of material, ensure that the material granule is dry, can avoid appearing brilliant the point at 1 in-process of extrusion clip chain, influence the quality of sealing strip.
Step S2: respectively heating the first mixture, the second mixture and the four types of metallocene polyethylene by using an extrusion device 5 to form meltsA body. Preferably, the four types of metallocene polyethylene are 2012-type metallocene polyethylene produced by ExxonMobil, and the density of the metallocene polyethylene is 0.912g/m3The melt index is 2g/10 min. Similarly, the materials need to be dried before the four types of metallocene polyethylene are heated, the drying temperature is 60-80 ℃, and the drying time is 45-60 min.
As shown in fig. 1, the extrusion apparatus 5 includes a die 55 and a first extrusion unit 51, a second extrusion unit 52, and a third extrusion unit 53 respectively communicating with the die 55. Each extrusion unit comprises an extrusion device 54, the extrusion device 54 comprises a barrel 541 and a screw 542 arranged in the barrel 541, and the barrel 541 is provided with a feeding hole 5411 and a discharging hole 5412, as shown in fig. 2-5. The screw 542 can heat the material in the barrel 541, and the screw 542 can be driven to rotate in the barrel 541 to extrude the material in the barrel 541 from the discharge opening 5412 into the die head 55. The die head 55 is provided with two groups of discharging cavities, the discharging cavities are respectively communicated with the outside of the die head 55 and penetrate through the bottom end face of the die head 55, and when the jig 6 is installed at the bottom end of the die head 55, it can be ensured that materials can be extruded into the cavity of the jig 6 through the discharging cavities of the die head 55. Each set of discharge chambers includes a first discharge chamber 551, a second discharge chamber 552, and a third discharge chamber 553, as shown in fig. 6. The first extrusion unit 51 is in communication with the first discharging chamber 551, the second extrusion unit 52 is in communication with the second discharging chamber 552, and the third extrusion unit 53 is in communication with the third discharging chamber 553. In specific implementation, in order to improve the working efficiency and reduce the labor cost, an automatic suction machine may be used to suck the material to be heated into the barrel 541 of the corresponding extrusion device 54, that is, the first mixture is added into the barrel 541 of the first extrusion unit 51, the second mixture is added into the barrel 541 of the second extrusion unit 52, and the four types of metallocene polyethylene are added into the barrel 541 of the third extrusion unit 53.
In order to ensure the quality of the melt extruded by the extrusion device 5, at least one heating device 56 is further provided between the discharge port 5412 of each extrusion device 54 and the die 55, i.e. the discharge port 5412 of each extrusion device 54 is communicated with the discharge cavity in the die 55 through the heating device 56. One or more heating devices 56 and the extruding device 54 form a plurality of heating temperature zones with uniformly increasing temperatures, so that a better melting effect on the material is obtained, and high-quality melt extruded into the die head 55 is guaranteed. Preferably, the temperature of the first temperature zone is 150 ℃, the temperature of the second temperature zone is 150-161 ℃, the temperature of the third temperature zone is 161-172 ℃, the temperature of the fourth temperature zone is 172-183 ℃, the temperature of the fifth temperature zone is 183-194 ℃, and the temperature of the sixth temperature zone is 194-205 ℃.
Step S3: the first mixture and the second mixture which are in a molten state are respectively added into a first cavity 63 of the jig 6 through the extrusion equipment 5, four types of metallocene polyethylene which are in a molten state are added into a second cavity 64 of the jig 6, and the three types of melts are converged in a discharge cavity 65 of the jig 6 to form a preformed clip chain attached with the four types of metallocene polyethylene layers 4 on one side of the framework leaves 12.
The jig 6 is a plate-shaped structure and has a first side surface 61 and a second side surface 62, two sets of cavities penetrating through the first side surface 61 and the second side surface 62 are respectively formed in the jig 6 along the thickness direction of the jig, and each set of cavities includes a first cavity 63 having a set shape and a second cavity 64 having a set shape, as shown in fig. 7. Two groups of cavities are two clamping chains 1 which can be clamped with each other and are used for producing the sealing strip. The first cavity 63 and the second cavity 64 respectively penetrate through the first side surface 61. The first cavity 63 and the second cavity 64 are communicated with each other to form a discharging cavity 65 in the jig 6, and the discharging cavity 65 penetrates through the second side surface 62 of the jig 6, as shown in fig. 8 and 9. The first cavity 63 includes a bone strip cavity 631 and a bone strip leaf cavity 632, the bone strip leaf cavity 632 being in communication with the bone strip cavity 631. The two sets of cavity bone strip leaf cavities 632 are the same size and shape, and are also elongated long cavities, as shown in fig. 7 and 8. Preferably, the length directions of the two groups of cavities are arranged along the length direction of the jig 6, and the two groups of cavities are arranged at intervals. The length direction of the bone strip leaves 12 in each set of cavities is also consistent with the length direction of the jig 6, and the bone strip cavity 631 is located at one side of the length direction of the bone strip leaf cavity 632. The bone strip cavity 631 and the bone strip blade cavity 632 of each set of cavities are completely communicated in the jig 6, namely, one cavity is divided into the bone strip cavity 631 and the bone strip blade 12. The rib cavity 631 is a sub-cavity with one side provided with a plurality of sub-cavities for forming a rib buckling structure, and the shapes of the sub-cavities of the rib cavities 631 in the two groups of cavities are correspondingly arranged, so that two produced clamp chains 1 can be perfectly clamped together to complete chain combination. The second cavity 64 is located on one side of the rib leaf cavity 632, preferably, the first cavity 63 is located on one side of the sub-cavity, so that when the chains are closed, one side of the four metallocene polyethylene layers 4 on the rib leaves 12 of the two clamping chains 1 faces the outer side of the sealing strip respectively. The second cavity 64 is in communication with the bone blade cavity 632. When the jig 6 is installed on the die head 55, the bone strip cavity 631 on the jig 6 is communicated with the first discharging cavity 551, the bone strip blade cavity 632 on the jig 6 is communicated with the second discharging cavity 552, and the second die cavity 64 on the jig 6 is communicated with the third discharging cavity 553.
It will be appreciated that, because the dimensions of the bone strip 11 are larger than the bone strip leaves 12, the dimensions of the bone strip chamber 631 are larger than the bone strip leaf chambers 632, and therefore more material must be packed into the bone strip chamber 631. In specific implementation, the extrusion capacity of the first extrusion device is larger than that of the other two extrusion devices. Moreover, since the rib cavity 631 is communicated with the rib leaf cavity 632, the first extrusion device and the second extrusion device need to control the extrusion speed ratio between the two extrusion devices to achieve that the pressures of the two melts in the first cavity 63 of the jig 6 are substantially the same, so that most of the first mixture and the second mixture in the melt form are respectively located in each cavity of the jig 6, and a pre-forming clip chain formed by combining the two mixed materials is formed. Similarly, at the discharging cavity 65 of the jig 6, the second cavity 64 is also communicated with the rib blade cavity 632, so that the extrusion speed ratio between the third extrusion device and the second extrusion device needs to be controlled, and the four metallocene polyethylene materials in the second cavity 64 can be smoothly extruded from the discharging cavity 65 of the jig 6 together with the two mixed materials.
The jig 6 is further provided with a plurality of fixing holes 67 and a plurality of positioning holes 66, the bottom end face of the die head 55 is also provided with the fixing holes 67 at positions corresponding to the fixing holes 67 of the jig 6, positioning pins 554 are arranged at positions corresponding to the positioning holes 66 of the jig 6, the jig 6 can be fixedly mounted at the bottom end of the die head 55 through the fixing holes 67 by using fasteners such as bolts, and the positioning pins 554 and the positioning holes 66 are positioned. It should be noted that the jig 6 and the bottom end surface of the die head 55 need to have a certain smoothness, so as to ensure the tightness between the jig 6 and the bottom end surface of the die head 55.
Step S4: and drawing the preformed clip chain formed in the step S3 to a cooling device through a drawing device for cooling to form a semi-finished clip chain. The cooling equipment is a constant-temperature water tank, and the pre-forming clamp chain is pulled into the constant-temperature water tank by the pulling equipment to be cooled. A water cooler can be connected to the water tank, so that the constant temperature of cooling water in the water tank is realized. The cooling water in the constant temperature water tank is 26-30 ℃. Different sizes of the clip chains 1 are obtained by controlling the traction speed of the traction equipment, the extrusion speed of the extrusion equipment 5 and the liquid level height of cooling water in the constant-temperature water tank. During production, due to the extrusion effect of the extrusion device 5, the preformed clip chain in a melt shape at the position close to the discharging cavity 65 of the jig 6 is thicker and wider, and the traction effect of the traction device on the preformed clip chain can be adjusted by adjusting the traction speed of the traction device. At a set extrusion speed of the extrusion device 5, the preforming clip chain is still in a plastic stage when extruded by the jig 6, so that the narrower or thinner preforming clip chain can be obtained by adjusting the traction speed of the traction device. Meanwhile, the preformed clip chain is cooled and shaped after being cooled by the cooling water, and the size of the preformed clip chain can hardly change under the traction of the traction equipment, so that the traction time and the traction distance of the traction equipment to the preformed clip chain before being cooled can be adjusted by adjusting the liquid level height of the cooling water, namely the distance between the cooling water and the jig 6, and the width or the thickness of the produced clip chain 1 can be adjusted. It is to be understood that the lower the cooling water level, i.e. the further between the cooling water level distances, the thinner and narrower the resulting clip chain 1.
For better traction, one or more roll shafts can be arranged in the constant-temperature water tank, and the roll shafts are all arranged under the cooling water level of the constant-temperature water tank, preferably at the bottom position close to the constant-temperature water tank, so as to increase the cooling time. The preforming clip chain is extruded through the jig 6 to form a linear melt, one end of the preforming clip chain penetrates through the lower portion of the roll shaft, and then the cooled preforming clip chain is pulled by using a traction device, so that the preforming clip chain can be guaranteed to be always located in cooling water of the cooling device during cooling, and the cooling effect is guaranteed.
Step S5: the chain 1 with ideal quality can be obtained only after the extruded and cooled semi-finished chain needs to be reduced, and the sealing performance of the sealing strip is further ensured. And (5) placing the semi-finished product clip chain obtained in the step (S4) in a space with a set temperature for a set time to form a finished product clip chain. Preferably, the semi-finished product chain clip is placed in an environment with the temperature of not less than 20 ℃ for reduction for a set time. For example, if the outdoor temperature is higher than 20 ℃, the semi-finished clip chain can be placed indoors for natural standing for 1 hour for reduction. And if the outdoor temperature is lower than 20 ℃, placing the semi-finished product clip chain in a sealed space with the temperature higher than 20 ℃ for not less than 3 hours for reduction. Wherein, the temperature in the sealed space can be ensured by the electric heating drying device.
Step S6: and (5) using a chain combining machine to combine the chains to form the finished sealing strip. When the chain combining machine is used for chain combining, one side of the four metallocene polyethylene layers 4 arranged on the rib leaves 12 of the two clip chains 1 respectively faces the outer side of the sealing strip, so that the sealing strip with the four metallocene polyethylene layers 4 arranged on the outer side of the rib leaves 12 is formed.
In this embodiment, a specific structure of a slider type sealed bag is schematically provided, as shown in fig. 10. The slider formula sealing bag includes the bag body 3, and the sealing strip setting is in the opening part of the bag body 3, it is provided with gliding slider 2 of its length direction to slide on the sealing strip. When producing the sealing bag, need carry out the intercepting to the sealing strip according to the size of the sealing bag of producing to utilize modes such as ultrasonic bonding to weld the both ends of sealing strip length direction simultaneously, can guarantee that slider 2 is in can not follow when sliding on the sealing strip roll-off on the sealing strip. The opening part of the bag body 3 is sleeved with the sealing strip bone strip leaf 12 outside, namely the bone strip leaf 12 is provided with one side of four metallocene polyethylene layers 4, and the bone strip leaf 12 is attached to the bag body 3 through a thermal attaching knife, and then is shaped through a cooling knife. The sliding block 2 can slide on the sealing strip, so that the two clip chains 1 of the sealing strip can be in a buckled or unbuckled state. It should be noted that, in order to ensure the adhesion between the sealing strip and the bag 3 and reduce the production cost, in the implementation, the four types of metallocene polyethylene may be coated only on the partial area of the rib leaves 12 near the bottom end, but the coated four types of metallocene polyethylene need to cover all the area heated by the hot-sticking knife completely.
According to trial production, the production process of the sealing strip effectively reduces the bonding temperature between the sealing strip and the bag body 3 while ensuring the excellent performance of the sealing strip, for example, the 2012 type metallocene polyethylene produced by ExxonMobil is adopted as the four types of metallocene polyethylene, and after trial production, the temperatures of the upper and lower hot bonding knives are 252 ℃ and 298 ℃ respectively when the hot bonding knife is used for bonding, and compared with the bonding temperatures of the upper and lower hot bonding knives before improvement, the bonding temperatures of 276 ℃ and 325 ℃ are obviously reduced.
The production process of the slider type sealing bag sealing strip at least has one or more of the following beneficial effects compared with the prior art:
(1) the sealing strip produced by the production process of the sliding block type sealing bag sealing strip can bear more than 7 pounds of pulling force in the opening direction or the closing direction, namely, the welding parts at the two sides of the sealing strip have stronger transverse pulling force bearing capacity compared with the prior art;
(2) the bearing capacity of the sealing strip produced by the production process of the sliding block type sealing bag sealing strip in the vertical direction is more than 10 pounds;
(3) the sealing strip produced by the production process of the sliding block type sealing bag sealing strip has excellent sealing property, does not leak water, and does not leak water;
(4) according to the sealing strip produced by the production process of the sliding block type sealing bag, when the sealing bag is produced, no matter the bag body 3 attached to the rib leaves 12 is a thin film or a thick film, the attached part is not easy to tear;
(5) according to the production process of the slider type sealing bag sealing strip, the material formula is improved, the performance of mixed materials is more excellent, the equipment can continuously produce for more than six hours, and the yield is higher;
(6) when the sealing strip produced by the production process of the sliding block type sealing bag sealing strip is used for producing the sealing bag, compared with the prior art, the transparency and the stiffness of the bag body 3 with the same thickness are more transparent and stiffer;
(7) through the sealing strip of the production technology production of this application slider formula sealing bag sealing strip, when producing the sealing bag, the laminating temperature of heat laminating sword is compared prior art lower, when laminating bag body 3 and bone strip leaf 12, bag body 3's shrink degree is lower, sealing strip after the laminating is straight state basically.
As used herein, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, including not only those elements listed, but also other elements not expressly listed.
In this document, the terms front, back, upper and lower are used to define the components in the drawings and the positions of the components relative to each other, and are used for clarity and convenience of the technical solution. It is to be understood that the use of the directional terms should not be taken to limit the scope of the claims.
The features of the embodiments and embodiments described herein above may be combined with each other without conflict.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (7)

1. The production process of the slider type sealing bag sealing strip is characterized by comprising the following steps:
step S1: mixing non-linear low-density polyethylene, first-class metallocene polyethylene, second-class metallocene polyethylene and high-density polyethylene according to a set weight ratio to obtain a first mixture for forming the chain clamping bone strip;
mixing nonlinear low-density polyethylene, linear low-density polyethylene and three types of metallocene polyethylene according to a set weight ratio to obtain a second mixture for forming the leaves of the chain clamping strips;
step S2: respectively heating the first mixture, the second mixture and the four types of metallocene polyethylene by using an extrusion device to form melts;
step S3: respectively adding a first mixture and a second mixture which are in a melt state into a first cavity of a jig through the extrusion equipment, adding four types of metallocene polyethylene which are in a melt state into a second cavity of the jig, and converging three types of melts in a discharge cavity of the jig to form a preformed clip chain attached with the four types of metallocene polyethylene at one side of a rib leaf;
step S4: drawing the preformed clip chain formed in the step S3 into a cooling device through a drawing device for cooling to form a semi-finished clip chain;
step S5: placing the semi-finished product clip chain obtained in the step S4 in a space with a set temperature for a set time to form a finished product clip chain;
step S6: using a chain combining machine to combine the chains to form a finished sealing strip;
wherein the melt index range of the nonlinear low density polyethylene is 2-5g/10 min; the melt index range of the linear low density polyethylene is 0.5-2.5g/10 min; the melt index range of the metallocene polyethylene is 0.2-1.2g/10 min; the melt index range of the second metallocene polyethylene is 3-5g/10 min; the melt index range of the high-density polyethylene is 0.5-1g/10 min; the melt index range of the three types of metallocene polyethylene is 0.2-5g/10 min; the melt index range of the four types of metallocene polyethylene is 0.5-2.5g/10 min;
the density range of the metallocene polyethylene is 0.93-0.95g/m3(ii) a The density of the second metallocene polyethylene is 0.93-0.95g/m3(ii) a The density of the three types of metallocene polyethylene ranges from 0.85 to 0.95g/m3(ii) a The density of the four types of metallocene polyethylene ranges from 0.91 to 0.92g/m3；
The first mixture comprises the following components in parts by weight: non-linear low density polyethylene: 35% -42%, linear low density polyethylene: 10% -15%, a metallocene polyethylene: 5% -9%, metallocene polyethylene of two types: 20% -30%, high density polyethylene: 10% -15%;
the second mixture comprises the following components in parts by weight: non-linear low density polyethylene: 40% -60%, linear low density polyethylene: 10% -20%, three types of metallocene polyethylene: 30 to 40 percent.
2. The production process of the slider type sealing bag sealing strip according to claim 1, wherein the first mixture comprises the following components in parts by weight: non-linear low density polyethylene: 39% -41%, linear low density polyethylene: 13% -14%, a metallocene polyethylene: 6% -7%, metallocene polyethylene of two types: 26% -27%, high density polyethylene: 13% -14%;
the second mixture comprises the following components in parts by weight: non-linear low density polyethylene: 49% -51%, linear low density polyethylene: 16% -17%, three types of metallocene polyethylene: 33 to 34 percent.
3. The production process of the sealing strip of the slider type sealing bag as claimed in claim 1, wherein the cooling device used in step S4 is a constant temperature water tank, the pre-forming clip chain is pulled into the constant temperature water tank by a pulling device for cooling, the temperature of the cooling water in the constant temperature water tank is 26-30 ℃,
obtaining chain clamps with different sizes by controlling the traction speed of the traction equipment, the extrusion speed of the extrusion equipment and the liquid level height of cooling water in the constant-temperature water tank;
in step S6, when the chain closing machine is used to close the chain, the four types of metallocene polyethylene are provided on the leaf of the rib of the two types of clip chain, and the side faces the outside of the sealing strip.
4. The jig for the slider type sealing bag sealing strip is characterized by being applied to the production process for the slider type sealing bag sealing strip according to claim 1, and the jig is of a plate-shaped structure and is provided with a first side surface and a second side surface, two groups of cavities penetrating through the first side surface and the second side surface are respectively formed in the jig along the thickness direction of the jig, each group of cavities comprises a first cavity with a set shape and a second cavity with a set shape, the first cavity and the second cavity respectively penetrate through the first side surface, the first cavity and the second cavity are communicated with each other in the jig to form a discharging cavity, and the discharging cavity penetrates through the second side surface of the jig.
5. The jig for the slider-type sealing bag sealing strip according to claim 4, wherein the first cavity comprises a bone strip cavity and a bone strip leaf cavity, the bone strip leaf cavity is communicated with the bone strip cavity, the second cavity is located on one side of the bone strip leaf cavity, and the second cavity is communicated with the bone strip leaf cavity.
6. The extrusion equipment of the slider type sealing bag sealing strip is characterized by being applied to the production process of the slider type sealing bag sealing strip in claim 1, comprising a die head, a first extrusion unit, a second extrusion unit and a third extrusion unit which are respectively communicated with the die head, wherein each extrusion unit comprises an extrusion device, each extrusion device comprises a material barrel and a screw rod arranged in the material barrel, a feeding hole and a discharging hole are formed in the material barrel, the screw rod can heat materials in the material barrel, the screw rod can be driven to rotate in the material barrel, and the materials in the material barrel are extruded into the die head from the discharging hole.
7. The extrusion device of the slider type sealing bag sealing strip according to claim 6, wherein the die head is provided with two sets of discharging cavities respectively, the discharging cavities are communicated with the outside of the die head respectively, each set of discharging cavities comprises a first discharging cavity, a second discharging cavity and a third discharging cavity, the first extrusion unit is communicated with the first discharging cavity, the second extrusion unit is communicated with the second discharging cavity, and the third extrusion unit is communicated with the third discharging cavity,
when the jig is installed on the die head, a bone cavity on the jig is communicated with the first discharging cavity, a bone blade cavity on the jig is communicated with the second discharging cavity, and the second cavity on the jig is communicated with the third discharging cavity;
each extrusion unit also comprises at least one heating device, and a discharge hole of the extrusion device is communicated with a discharge cavity in the die head through the heating device.
CN202011416415.9A 2020-12-04 2020-12-04 Production process of slider type sealing bag sealing strip, jig and extrusion equipment thereof Active CN112356475B (en)

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JP3652436B2 (en) * 1996-04-30 2005-05-25 鬼怒川ゴム工業株式会社 Wind molding for automobile and extrusion molding apparatus for the wind molding
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