KR101291941B1 - Manufacturing method for foaming type polypropylene tape - Google Patents

Abstract

PURPOSE: A manufacturing method for foaming type polypropylene tape is provided to be light due to the fact that the weight of the tape is light. CONSTITUTION: A manufacturing method for foaming type polypropylene tape comprises the following steps. 100 parts by weight % of Polymer polypropylene with more than 6 of distribution of molecular weight (PI) and 50mN of melt strength is mixed with 1.5-3 parts by weight % of blowing agent (Step 1). A pressing apparatus manufactures a melting material from the mixture which is foaming type polypropylene and the foaming type polypropylene is made into a sheet by T-die method (Step2). The foaming type polypropylene sheet is in orientation process (Step 3). The foaming type polypropylene finished with orientation process is heated and cooled for stabilization (Step4). The stable foaming type polypropylene sheet is cut to be made into a foaming type polypropylene tape (Step5). [Reference numerals] (AA) Start; (BB) End; (S11) Produce a foaming type polypropylene mixture by mixing a co-polymer Polypropylene material and a foaming agent; (S12) Transfer the foaming type polypropylene mixture to a pressing apparatus; (S13) Produce a melting material from the foaming type polypropylene mixture; (S14) Produce a foaming type polypropylene sheet using the foaming type polypropylene mixture through a T-die method; (S15) Cool the foaming type polypropylene sheet using a cooling tank; (S16) Transfer the foaming type polypropylene sheet to a multi-extension roller using a guide roller; (S17) Conduct a series of extension processes using the internal temperature of the multi-extension roller and heating oil; (S18) Stabilize the foaming type polypropylene sheet by shrinking and cooling the sheet using the multi-stabilization roller; (S19) Produce a foaming type polypropylene tape by cutting the sheet, and wind

Description

Manufacturing method for foaming type polypropylene tape

The present invention relates to a foamed polypropylene tape manufacturing method, and more specifically, to reduce the specific gravity while maintaining the physical properties of the polypropylene tape used as a conventional insulating tape as it is, the tensile strength by the stepwise stretching process It relates to a foam type polypropylene tape manufacturing method for improving the.

Insulation tape insulates electricity flowing through products such as electric wires and cables, and is used for safe operation and stable use by workers and users. Insulation tapes typically used to coat electrical wires mainly use polyethylene tapes or nonwoven tapes.

Among them, polyethylene has excellent softening point, hardness, and strength, but all have disadvantages such as small elongation and impact resistance and a specific gravity of more than 0.95. On the other hand, polypropylene is obtained by polymerizing propylene obtained from petroleum like polyethylene with a Ziegler-Natta catalyst, and is made by the same method as low pressure polyethylene.

Generally, polypropylene has a melting point of 165 ° C., and particularly has a specific gravity of 0.9 to 0.92, which is lighter than polyethylene. In particular, it is excellent in insulation because it is composed of only carbon and hydrogen in electrical properties, and it is used in packaging films, stretched tapes, fibers, pipes, daily necessities, toys, industrial parts, containers, etc., because it is superior to polyethylene.

However, the specific gravity of the polypropylene 0.9 to 0.92 is still inconvenient for the user when the coating for the thick insulation is in need of technology development for weight reduction.

[Related Technical Literature]

1. TWIST WINDING APPARATUS OF SYNTHETIC RESIN FLAT YARN (Patent Application No. 10-2010-0026028)

2. BIAXIALLY ORIENTED ELECTRICAL INSULATING FILM (Patent Application No. 10-2009-7004080)

The present invention is to solve the above problems, to provide a foamed polypropylene tape manufacturing method for reducing the specific gravity while maintaining the physical properties of the polypropylene tape used as a conventional insulating tape to reduce the weight.

In addition, the present invention is to provide a foamed polypropylene tape manufacturing method for improving the tensile strength while maintaining the physical properties of the polypropylene tape used as a conventional insulating tape.

However, the objects of the present invention are not limited to the above-mentioned objects, and other objects not mentioned can be clearly understood by those skilled in the art from the following description.

In order to achieve the above object, a foamed polypropylene tape manufacturing method according to an embodiment of the present invention comprises a first step of forming a foamed polypropylene mixture comprising a polypropylene raw material and a blowing agent; A second step of producing a foamed polypropylene extrusion melt by an extruder and then molding the foamed polypropylene sheet by a T-die method; A third step of performing stepwise stretching on the foamed polypropylene sheet; A fourth step of performing stabilization by heating and cooling of the stretched polypropylene sheet; And a fifth step of producing the foamed polypropylene tape according to the stabilized foamed polypropylene sheet cutting. .

In this case, the polypropylene raw material of the first step is a homopolymer of propylene or a block or an irregular copolymer with another α-olefin having 2 to 8 carbon atoms, and the α-olefin is 1-butene (1-butene). ), 1-pentene, 1-hexene and 1-octene.

In addition, the amount of the α-olefin copolymerized with the propylene in the first step is preferably 0.001 to 50 mol% per mol of the propylene.

In addition, the polypropylene raw material of the first step, the weight average molecular weight is 300,000 g / mol or more, the melt index is preferably 0.1 to 10 g / 10 minutes (230 ℃).

In addition, the foamed polypropylene mixture of the first step is preferably blended 1.5 to 3% by weight of the blowing agent with respect to 100% by weight of the polypropylene raw material having a molecular weight distribution (PI) of 6 or more and a melt strength of 50mN or more. Do.

In addition, the blowing agent of the first step, azodicarbonamide, p, p-oxybisbenzenesulfonylhydrazide, dinitrosopentamethylenetetramine, p-toluenesulfonylhydrazide, benzenesulfonylhydra as a chemical blowing agent It is preferable to use a mixture of any one or more selected from the group consisting of jide, sodium bicarbonate and sodium carbonate.

In addition, the blowing agent of the first step, it is preferable to use a fine particle having an average particle diameter of 0.5 to 20 ㎛, dispersion-mixing glycerin tri 12-hydroxystearate.

In the second step, the foamed polypropylene mixture is moved to a plastic foam sheet extruder by a hopper to produce the foamed polypropylene extrusion melt, and the plastic foam sheet extruder is formed by the hopper. It is formed to include a cylinder for melting and mixing the injected foam type polypropylene mixture, a screw installed in the cylinder to pump the mixed foam type polypropylene mixture, and a heater installed for heating the foam type polypropylene extrusion melt desirable.

In addition, the second step, using the T-die for controlling the flow rate of the foamed polypropylene extrusion melt melted by the synthetic resin foam sheet extruder to control the thickness for forming the foamed polypropylene sheet, It is preferable to control the flow rate for the foamed polypropylene extrusion melt by a pneumatic drive system.

In addition, between the second step and the third step, the step of cooling the foamed polypropylene sheet for 10 seconds to 20 seconds using a cooling bath; And transferring the cooled foamed polypropylene sheet to a multi-stretch roller for the stepwise stretching by a guide roller. .

In addition, the third step is filled with the oil heated between 120 ℃ to 130 ℃, consisting of a plurality of upper stretching roller formed on the upper, and a plurality of lower stretching roller formed in the lower portion between the longitudinal direction of the upper stretching roller, respectively It is preferably carried out by the multi-stretch roller to move the foamed polypropylene sheet.

In addition, the third step, the foamed polypropylene sheet is advanced for each stretching roller paired by one of the upper stretching roller and the lower stretching roller to perform the step-wise stretching of the foamed polypropylene sheet. It is preferable that the high temperature and the rotational speed are set to increase in the direction.

In addition, the fourth step, it is preferable to perform the stabilization of the foamed polypropylene sheet by heating and cooling by a multi-stable roller.

In addition, the multi-stable roller of the fourth step, a pair of heating rollers consisting of an upper heating roller and a lower heating roller, and a pair of cooling rollers consisting of an upper cooling roller and a lower cooling roller, It is preferably formed in turn in the advancing direction to perform heating and cooling, respectively.

In addition, the pair of heating rollers of the fourth stage is filled with oil heated to a higher temperature than the multi-stretching roller inside, and the pair of cooling rollers of the fourth stage are filled with cooling oil therein. It is preferable.

Further, the foamed polypropylene tape of the fifth step has a tensile strength when the thickness is 0.080 mm to 0.125 mm, the width is 25 mm to 830 mm, and the weight is 45 ± 4 to 65 ± 6 g / m2. It is preferable that it is 100 N / mm <2> or more and specific gravity is 0.52.

In addition, the blowing agent of the first step, it is preferable to use an organic gas selected from the group consisting of aliphatic hydrocarbons, alicyclic hydrocarbons, and halogenated hydrocarbons.

In addition, the polypropylene raw material of the first step is characterized in that the co-polymer polypropylene (Co-Polymer Polypropylene) raw material.

In addition, the blowing agent of the first step is preferably NaHCO 3 (Sodium bicarbonate) as the chemical blowing agent.

Foamed polypropylene tape manufacturing method according to an embodiment of the present invention, by blending a chemical blowing agent, by reducing the specific gravity to about 0.52 from 0.9 to 0.92 of the conventional provides an effect that can be reduced in weight to the product.

In addition, the foam type polypropylene tape manufacturing method according to another embodiment of the present invention provides an effect of improving the tensile strength while maintaining the physical properties of the polypropylene tape used as a tape for conventional insulation.

1 is a flow chart showing a foamed polypropylene tape manufacturing method according to an embodiment of the present invention.
Figure 2 is a view for explaining the foaming state in the foamed polypropylene tape by the foamed polypropylene tape manufacturing method of Figure 1 compared with the prior art.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a detailed description of preferred embodiments of the present invention will be given with reference to the accompanying drawings. In the following description of the present invention, detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

1 is a flow chart showing a foamed polypropylene tape manufacturing method according to an embodiment of the present invention. Referring to Figure 1, to form a foam type polypropylene mixture in which the polypropylene raw material and the blowing agent (S11). Here, the polypropylene raw material uses a co-polymer polypropylene raw material, and the mixing with the blowing agent is carried out by mixing the foamed polypropylene mixture by the screw method.

In the present invention, the polypropylene raw material means a block or irregular copolymer of propylene homopolymer or other α-olefin having 2 to 8 carbon atoms. Preferred examples of the α-olefins include 1-butene, 1-pentene, 1-hexene and 1-octene, and are copolymerized with propylene. The amount of α-olefin is 0.001 to 50 mol% per mol of propylene. The weight average molecular weight of the polypropylene should be at least 300,000 g / mol and the melt index should be 0.1 to 10 g / 10 minutes (230 ° C.).

In addition, the foamed polypropylene mixture, as described above, has a melt index of 0.1 to 10 g / 10 minutes, a molecular weight distribution (PI) of 6 or more, and a foaming agent based on 100% by weight of polypropylene raw material having a melt strength of 50 mN or more. 1.5 to 3% by weight is blended. If the content of the foaming agent used to prepare the foamed polypropylene mixture is less than 1.5% by weight, the specific gravity, foamability, moldability and impact characteristics are deteriorated, which is undesirable. It is not preferable because it is lowered and unsuitable for application of the insulation.

At this time, it is preferable that a chemical blowing agent mainly used is NaHCO 3 (Sodium bicarbonate).

Chemical blowing agents according to another embodiment used in the present invention azodicarbonamide, p, p-oxybisbenzenesulfonylhydrazide, dinitrosopentamethylenetetramine, p-toluenesulfonylhydrazide, benzenesulfonylhydra Any one or more selected from the group consisting of a jide, sodium hydrogen carbonate and sodium carbonate are used in combination, and the average particle diameter of the chemical blowing agent is usually used with fine particles of 0.5 to 20 μm. In addition, it is preferable to disperse and mix glycerin tri 12-hydroxystearate in the chemical blowing agent.

By using such a foamed polypropylene mixture, the compounding is performed at a specific gravity of 0.52 due to the chemical blowing agent at 0.9 to 0.92, which is the specific gravity of the polypropylene raw material, so that the physical properties of the existing co-polymer polypropylene can be maintained even when the specific gravity is reduced. Will be. In addition, the chemical blowing agent according to the present invention is not formed by aggregating the blowing agent in the conventional microscopic enlarged picture of the polypropylene tape according to the mixing ratio and the components of the above-mentioned chemical blowing agent. By maintaining in the form of microbubbles in the state, it provides an effect that the insulating property which does not affect the electrical properties becomes more excellent.

In conclusion, in the present invention, homo-polymer polypropylene (Homo-Polymer Polypropylene) and co-polymer polypropylene in the present invention to reduce the existing specific gravity by mixing the chemical blowing agent as a base material to ensure cost competitiveness.

After step S11, the foamed polypropylene mixture produced in step S11 is transferred to the extruder by a hopper (S12).

After step S12, the foamed polypropylene mixture produced in step S11 is extruded using an extruder to produce a foamed polypropylene extrusion melt (S13).

Here, the extruder may use a synthetic foam sheet extruder. Synthetic foam sheet extruder is a cylinder for melt-mixing the foamed polypropylene mixture injected by the hopper into the foamed polypropylene mixture, a screw installed to convey the foamed polypropylene mixture installed inside the cylinder, and foamed. It is preferably formed including a heater installed for heating the type polypropylene mixture. Here, the heater is used to enable sufficient heating until the foamed polypropylene mixture reaches the melting point.

Herein, the polypropylene raw material is a polypropylene resin having a concentration of 65 to 85 wt.%, And dissolved at a temperature of 100 to 220 ° C.

After step (S13), the foamed polypropylene extrusion melt is molded into a foamed polypropylene sheet by a T-die method (S14). That is, a T-die (mould) for controlling the flow rate of the melted foamed polypropylene extruding melt by a plastic foam sheet extruder is used to control the dickness for forming the foamed polypropylene sheet. That is, it is preferable to use a pneumatic drive system to control the flow rate for the foamed polypropylene extrusion melt.

After step S14, the foamed polypropylene sheet molded in step S14 is cooled using a cooling bath (S15). When cooling using a cooling tank, a foamed polypropylene sheet falling downwardly with a cooling tank is moved to a cooling water containing water at -4 ° C to 25 ° C while moving by a transfer roller for 10 to 20 seconds in the cooling tank. Cooling is preferably performed by

On the other hand, in another embodiment of the present invention to moisturize the surface of the stretched product of the crystalline polymer in order to modify the crystalline polymer constituting the foamed polypropylene sheet to a high speed and high speed in the previous step of the stepwise stretching of step (S16) The stretched article can be stretched by using a stretched bath containing a high pressure pressurized saturated steam as a stretch medium as a cooling bath, so that the stretched article can be more deformed than in the conventional stretching method. At this time, the use of pressurized saturated steam having an absolute pressure of 2.0 kg / cm 2 or more as a stretching medium requires that the cooling vessel container be highly airtight so as not to leak pressurized saturated steam. It is necessary to form the stretched object introduction hole for supplying to a cooling tank, and the stretched object lead-out hole for taking out a stretched object in a container.

The foamed polypropylene sheet cooled according to step S15 is transferred to a multi-stretch roller by a guide roller (S16). Here, the guide roller serves to remove the water remaining in the foamed polypropylene sheet and harden the shape in the middle of moving the foamed polypropylene sheet cooled in the cooling tank to the multi-stretch roller. To this end, the guide roller preferably includes a plurality of transfer rollers formed vertically downward after moving the foamed polypropylene sheet vertically upward from the cooling tank, so that the foamed polypropylene sheet is moved to the multi-stretch roller. The temperature of the multi-stretch roller is preferably set to 120 to 130 degrees.

After step S16, stepwise stretching by a multi-stretch roller is performed on the foamed polypropylene sheet (S17). Here, the multi-stretch roller is filled with oil heated therein, and consists of a plurality of upper stretch rollers formed at the upper portion and a plurality of lower draw rollers formed at the lower portion between the upper stretch rollers in the longitudinal direction, respectively, to move the foam-type polypropylene sheet forward. Let's do it. At this time, stepwise stretching of the foamed polypropylene sheet is performed by a tensile force due to a difference in rotational speed and roller diameter between a pair of stretching rollers consisting of an upper stretching roller and a lower stretching roller and a pair of stretching rollers. Stretching provides the effect of improving the tensile strength of the foamed polypropylene sheet (see Table 1 below).

Here, the pair of stretching rollers are set to gradually increase the rotational speed so that the pair of stretching rollers can be gradually stretched in the machine direction (MD). In addition, the multi-stretched roller is preferably set to a higher temperature toward the direction in which the elongated rollers of each pair of stretched rollers in consideration of being gradually stretched as the foamed polypropylene sheet proceeds in the forward direction. The polypropylene sheet can be prevented from breaking during the stretching process.

On the other hand, the temperature of the oil heated inside is formed between 120 to 130 ℃, by indirect heating to the foamed polypropylene sheet by each stretching roller to increase the chain structure of the polymer constituting the foamed polypropylene sheet By performing the stretching in a state, the stretching efficiency is maximized.

After step S17, stabilization is performed on the foamed polypropylene sheet by heating and cooling by the multi-stable roller (S18). The multi-stable roller includes a pair of heating rollers consisting of an upper heating roller and a lower heating roller, and a pair of cooling rollers consisting of an upper cooling roller and a lower cooling roller.

First, a pair of heating rollers have a higher temperature than stretching rollers therein to prevent shrinkage of the expanded polypropylene sheet stretched in step S16 and to stabilize the chain structure of the polymer constituting the foamed polypropylene sheet. The foamed polypropylene sheet is passed between the upper and lower heating rollers filled with oil.

Accordingly, the pair of cooling rollers performs cooling on the foamed polypropylene sheet passing through the pair of heating rollers. For this purpose, the upper cooling roller and the lower cooling roller are filled with cooling oil and rotated therein, The foamed polypropylene sheet is passed between the upper cooling roller and the lower cooling roller.

That is, if the foamed polypropylene sheet stretched by multiple stretching rollers is cooled by a pair of cooling rollers without passing through the pair of heating rollers, the stretched state is to return to the state before the original stretching. In order to prevent shrinkage by its own retraction force, it is to perform heat setting or heat treatment at a higher temperature than the stretching roller corresponding to the highest temperature among the plurality of stretching rollers constituting the upper and lower portions of the multiple stretching roller.

After step (S18), the foamed polypropylene tape produced by cutting the stabilized foamed polypropylene sheet is produced and then wound (S19). Here, the device and method for winding is performed by the registered patent (Patent Application No. 10-2010-0026028) by the present applicant.

Table 1 below is a method according to the step (S12) to step (S19) using a foam type polypropylene mixture by mixing the co-polymer polypropylene (Co-Polymer Polypropylene) raw material and the chemical blowing agent in step (S11) Tensile strength, elongation and melting point according to the first to fifth embodiments, the foamed polypropylene tapes are classified according to the thickness and weight of 0.080 mm to 0.200 mm. (Melting Point), a chart showing the experimental data for the process temperature (Process Temperatures).

division First Embodiment Second Embodiment Third Embodiment Fourth Embodiment Fifth Embodiment Dickness
0.080
(mm) 0.100
(mm) 0.125
(mm) 0.170
(mm) 0.200
(mm) Width
25 to 830
(mm) Weight
45 ± 4
(g / m2) 52 ± 5
(g / m2) 65 ± 6
(g / m2) 88 ± 8
(g / m2) 104 ± 10
(g / m2) The tensile strength
(Tensile Strength)
min. 100
(N / mm2) min. 100
(N / mm2) min. 100
(N / mm2) min. 85
(N / mm2) min. 80
(N / mm2) Elongation
(Elongation)
min. 15
(%) min. 15
(%) min. 15
(%) min. 15
(%) min. 15
(%) Melting point
(Melting Point) 160 to 170
(℃) Manufacturing temperature
(Process Temp.) max. 225
(℃) importance 0.52

Referring to Table 1, the foam type polypropylene tape having the specifications according to the first to fifth embodiments is commonly found to have a specific gravity of 0.52, so that the specific gravity is lower than that of the conventional polypropylene tape and the polypropylene raw material. .

In addition, the foamed polypropylene tape having a size according to the first to fifth embodiments has a tensile strength of at least 80 to 100 N / mm2, and has a size according to the first to third embodiments. Foamed polypropylene tapes have been shown to have a minimum of 100 N / mm 2 or greater.

In addition, the foamed polypropylene mixture having the specifications according to the first to fifth embodiments has a minimum elongation of 15% by elongation by elongation and heat stabilization by the process according to steps S16 to S18. Appears to have.

In addition, the foamed polypropylene mixture having the specifications according to the first to fifth embodiments has a value between 160 and 170 ° C. as a melting point, and can be up to 225 ° C. as a process temperature. Appears.

That is, the foamed polypropylene tape according to the present invention appears to maintain the physical properties of the existing polypropylene while lowering the specific gravity and increasing the tensile strength compared to the polypropylene tape and the polypropylene raw material according to the prior art.

Accordingly, thermoplastic elastomers such as styrene-butadiene rubber, styrene-ethylene block copolymer, ethylene-ethylene block copolymer, styrene-styrene block copolymer, and acrylic polymer are added to conventional polypropylene to improve weather resistance and tensile strength. Although the manufactured sheet is sold, there is a difficulty in processing due to the side effects of the addition, there is a problem that the transparency is reduced and the whitening phenomenon occurs. In addition, the surface tension is 20 to 28 dyne / cm 2 and far short of 32 to 44 dyne / cm 2 of the vinyl chloride resin has a problem of poor printability and adhesion to other resins. Accordingly, the foamed polypropylene tape prepared according to the present invention can solve this problem and additionally provide the effect of ensuring dimensional stability, weather resistance, ease of processing, and low manufacturing cost.

And as another embodiment of the blowing agent included in the foamed polypropylene mixture of the present invention used in step (S11) "aliphatic hydrocarbons" such as butane, propane, isobutane, pentane, hexane and heptane, cychlorobutane, "Cycloaliphatic hydrocarbons" such as cychloropentane and cychlorohexane, and chlorodifluoromethane, dichloromethane, dichlorofluoromethane, trichlorofluoromethane, chloroethane, dichlorotrifluoroethane and perfluorocyclo Organic gas selected from the group consisting of "halogenated hydrocarbons" such as robutane, and at least one selected from the group consisting of inorganic gases such as carbon dioxide, nitrogen and air can be used.

In addition, the foamed polypropylene tape according to the present invention preferably has a liquid absorption coefficient of 5 ml / (m 2 · ms 1/2) or more and a surface opening ratio of 7% or more, and is stretched in at least one axial direction. Moreover, as mentioned above, it is preferable that it is double that area draw ratio is 15% or more.

Furthermore, it is preferable that the foamed polypropylene tape thermoplastic resin of the present invention, inorganic fine powder surface-treated with at least one kind of surface treating agent, and a dispersant are used, and the surface treating agent is used by hydrophilizing the surface of the inorganic fine powder. Can be.

As described above, preferred embodiments of the present invention have been disclosed in the present specification and drawings, and although specific terms have been used, they have been used only in a general sense to easily describe the technical contents of the present invention and to facilitate understanding of the invention , And are not intended to limit the scope of the present invention. It will be apparent to those skilled in the art that other modifications based on the technical idea of the present invention can be carried out in addition to the embodiments disclosed herein.

Claims (19)

A first step of forming a foamed polypropylene mixture in which 1.5 to 3% by weight of a blowing agent is added to 100% by weight of a polypropylene (Polymer Polypropylene) raw material having a molecular weight distribution (PI) of 6 or more and a melt strength of 50 mN or more;
A second step of producing a foamed polypropylene extrusion melt by an extruder and then molding the foamed polypropylene sheet by a T-die method;
A third step of performing stepwise stretching on the foamed polypropylene sheet;
A fourth step of performing stabilization by heating and cooling of the stretched polypropylene sheet; And
A fifth step of producing the foamed polypropylene tape according to the stabilized cutting of the foamed polypropylene sheet; Foamed polypropylene tape manufacturing method comprising a.
The method according to claim 1, wherein the polypropylene raw material of the first step,
Block or irregular copolymers of homopolymers of propylene or other α-olefins having from 2 to 8 carbon atoms,
The α-olefin,
1-butene (1-butene), 1-pentene (1-pentene), 1-hexene (1-hexene) and 1-octene (1-octene) characterized in that the manufacturing method of the foamed polypropylene tape.
The method of claim 2, wherein the amount of α-olefin copolymerized with the propylene of the first step,
Method for producing a foam type polypropylene tape, characterized in that 0.001 to 50 mol% per mole of propylene.
The method of claim 3, wherein the polypropylene raw material of the first step,
The weight average molecular weight is 300,000 g / mol or more, the melt index is 0.1 to 10 g / 10 minutes (230 ℃) characterized in that the foamed polypropylene tape manufacturing method.
delete The method according to claim 1, wherein the blowing agent of the first step,
Group consisting of azodicarbonamide, p, p-oxybisbenzenesulfonylhydrazide, dinitrosopentamethylenetetramine, p-toluenesulfonylhydrazide, benzenesulfonylhydrazide, sodium bicarbonate and sodium carbonate as chemical blowing agents Method for producing a foam type polypropylene tape, characterized in that used by mixing any one or more selected from.
The method of claim 6, wherein the blowing agent of the first step,
A fine particle having an average particle diameter of 0.5 to 20 [mu] m, and a foamed polypropylene tape production method characterized by using a mixture of glycerin tri 12-hydroxystearate by dispersion.
8. The method of claim 7,
Moving the foamed polypropylene mixture to a plastic foam sheet extruder by a hopper to produce the foamed polypropylene extrusion melt,
The synthetic resin foam sheet extruder, a cylinder for melting and mixing the foam-type polypropylene mixture injected by the hopper, a screw for mixing and conveying the foam-type polypropylene mixture installed in the cylinder, the foamed polypropylene mixture for Foamed polypropylene tape manufacturing method characterized in that it is formed, including a heater installed for heating.
9. The method of claim 8,
Using the T-die for controlling the flow rate of the expanded polypropylene extruding melt melted by the synthetic resin foam sheet extruder for controlling the dickness for forming the expanded polypropylene sheet,
Method for producing a foam type polypropylene tape, characterized in that by the pneumatic drive system to control the flow rate for the foamed polypropylene extrusion melt.
The method of claim 9, wherein between the second step and the third step,
Cooling the foamed polypropylene sheet for 10 seconds to 20 seconds using a cooling bath; And
Transferring the cooled foamed polypropylene sheet to a multi-stretch roller for the staged stretching by a guide roller; Foamed polypropylene tape manufacturing method characterized in that it further comprises.
11. The method of claim 10,
Filled with oil heated between 120 ℃ to 130 ℃, consisting of a plurality of upper stretching roller formed on the upper, and a plurality of lower stretching roller formed in the lower portion between each of the upper stretching roller in the longitudinal direction of the foamed polypropylene sheet Method for producing a foam type polypropylene tape, characterized in that performed by the multi-stretch roller to move.
The method of claim 11, wherein the third step,
In order to perform the stepwise stretching of the foamed polypropylene sheet, the high-temperature and rotational speeds are gradually increased in the direction in which the foamed type polypropylene sheet is advanced for each pair of stretching rollers formed by one of the upper stretching roller and the lower stretching roller. Method of producing a foam type polypropylene tape, characterized in that it is set to increase.
The method of claim 12, wherein the fourth step,
Method for producing a foamed polypropylene tape, characterized in that to perform the stabilization of the foamed polypropylene sheet by heating and cooling by a multi-stable roller.
The method of claim 12, wherein the multi-stable roller of the fourth step,
A pair of heating rollers consisting of an upper heating roller and a lower heating roller, and a pair of cooling rollers consisting of an upper cooling roller and a lower cooling roller are sequentially formed in the advancing direction of the foamed polypropylene sheet to perform heating and cooling, respectively. Foamed polypropylene tape manufacturing method characterized in that.
The method of claim 14, wherein the pair of heating rollers of the fourth step,
Filled therein is oil heated to a higher temperature than the multi-stretch roller.
The pair of cooling rollers of the fourth step,
Method for producing a foam type polypropylene tape, characterized in that the cooling oil is filled inside.
The method according to claim 15, wherein the foamed polypropylene tape of the fifth step,
Foam having a thickness of 0.080 mm to 0.125 mm, a width of 25 mm to 830 mm, and a weight of 45 ± 4 to 65 ± 6 g / m2, having a tensile strength of at least 100 N / mm2 and a specific gravity of 0.52. Type polypropylene tape manufacturing method.
The method according to claim 7, wherein the blowing agent of the first step,
A method for producing a foamed polypropylene tape, comprising using an organic gas selected from the group consisting of aliphatic hydrocarbons, alicyclic hydrocarbons, and halogenated hydrocarbons.
The method according to claim 1, wherein the polypropylene raw material of the first step,
Method for producing a foam type polypropylene tape, characterized in that the raw material is Co-Polymer Polypropylene (Co-Polymer).
The method according to claim 1, wherein the blowing agent of the first step,
Method for producing a foam type polypropylene tape, characterized in that the chemical blowing agent NaHCO3 (Sodium bicarbonate).

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