KR102456330B1 - Apparatus and method for manufacturing resin pipe, and resin pipe manufactured using the same - Google Patents

Abstract

Provided is an apparatus for manufacturing a resin pipe, which comprises: an extrusion unit for extruding a synthetic resin composition for forming a synthetic resin tube into a base tube; a vacuum cooling unit for cooling the extruded base tube in a vacuum atmosphere; and a cutting unit for cutting and expanding the vacuum-cooled base tube to form a unit synthetic resin tube; and a control unit for controlling the extrusion conditions of the extrusion unit and the cooling conditions of the vacuum cooling unit.

Description

Synthetic resin pipe manufacturing apparatus and method, and synthetic resin pipe manufactured therefrom

The present invention relates to an apparatus and method for manufacturing a synthetic resin pipe, and a synthetic resin pipe manufactured therefrom, and more particularly, to improve production efficiency through a vacuum cooling method, ensure uniformity of the thickness of the expanded pipe, and increase the thickness of the straight pipe and It relates to an apparatus and method for manufacturing a synthetic resin tube capable of reducing the error of the synthetic resin tube, and to a synthetic resin tube manufactured therefrom.

Recently, PVC synthetic resin pipes are playing an excellent role as an alternative to steel pipes and reinforced concrete pipes (Hume pipes). On the other hand, due to the nature of the water and sewage pipe, it is cut to a length of about 6 meters and connected by a connection structure formed integrally with various connectors or one end of the pipe in the process of burying it in the ground, but the connection part is difficult because the internal pressure is concentrated in the connection part. It can be easily damaged or cause leakage, which can cause a problem of losing the reliability of the product.

In the case of conventional water and sewerage pipes, the pipe body is made to have a predetermined size, extruded to the same thickness, and then molded using a separate pipe expansion device at one end. This increases and the thickness is formed to be thinner than that of the straight pipe part (ie, the non-expanded pipe part). In these water and sewer pipes, when liquid is supplied to the pipe body, water pressure is concentrated on the connection part as water pressure is generated, and depending on the concentration of water pressure, the connection part is damaged or the watertight is not maintained due to water pressure, causing water leakage, or the pipe body straight pipe When the additional pipe is inserted into the inner diameter of the expansion pipe, it cannot be maintained in a fixed state, and is separated by external force, water pressure, and coefficient of thermal expansion, resulting in leakage of water.

In order to solve this drawback, Korean Patent Publication No. 10-1029344 (April 13, 2011) discloses the rotation of the extrusion screw in the expansion section of the water supply and sewer pipe to prevent the thickness of the expanded pipe from becoming thinner compared to the pipe body, even if the pipe is expanded later. It is disclosed that the number is increased at a predetermined interval to increase the extrusion amount and form thicker, but the thickness of the expanded pipe section after expansion for each process has irregular values such as thin or thick so that it deviates from the standard value, or the straight pipe section in the cut area There are many cases in which defects such as thickening of the ends occur, and improvement is required.

Korean Patent Publication No. 10-1029344 (2011.04.13)

The present invention has been devised to solve the above problems, and an object of the present invention is to secure the uniformity of the thickness of the expanded pipe, reduce the error with the thickness of the straight pipe, and at the same time improve the production efficiency through the vacuum cooling method. To provide an apparatus and method for manufacturing a synthetic resin tube.

The technical problems of the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned will be clearly understood by those skilled in the art from the following description.

According to an embodiment of the present invention in order to solve this problem, in an apparatus for manufacturing a synthetic resin tube, an extrusion unit for extruding a synthetic resin composition for forming the synthetic resin tube into a base tube; a vacuum cooling unit for cooling the extruded base tube in a vacuum atmosphere; a cutting part for cutting and expanding the vacuum-cooled base pipe to form a unit synthetic resin pipe; and a control unit for controlling the extrusion conditions of the extruding unit and the cooling conditions of the vacuum cooling unit.

The control unit controls the extrusion speed of the extrusion unit based on the pipe profile data of the synthetic resin tube, and the cooling water temperature and the It is characterized in that the degree of vacuum in the vacuum cooling unit is controlled.

The temperature of the cooling water sprayed by the vacuum cooling unit and the degree of vacuum in the vacuum cooling unit are characterized in that they have a relationship of Equation 1 below.

[Equation 1]

(Here, the Deg_vc represents the cooling water temperature [℃] sprayed by the vacuum cooling unit, and the P_vc represents the degree of vacuum [kgf/cm ² ] in the vacuum cooling unit.)

The control unit calculates the non-thick part extrusion rate value and the thick part extrusion rate profile based on the thickness of the straight pipe part in the profile data of the synthetic resin pipe, the outer diameter of the straight pipe part, and the outer diameter of the expanded pipe part, and then the extrusion part is calculated. It is characterized in that controlling to form each of the straight pipe part and the expanded pipe part based on the non-thick part extrusion rate value and the thick part extrusion rate profile, respectively.

The thick section extrusion rate profile may include a first thick section extrusion rate value (se1) at a first thick section (Tp1) corresponding to one end of the thick section as a cutting point (Cp); a second thick part extrusion rate value (se2) at a second thick part (Tp2) opposite to one end of the thick part and corresponding to the other end of the thick part formed integrally with the non-thick part; a third thick portion extrusion speed value se3 in the thick central region Tp3 located between the first thick point Tp1 and the second thick point Tp2; a fourth thick portion extrusion rate value se4 at the fourth thick point Tp4 located between the first thick point Tp1 and the thick central region Tp3; and a fifth thick part extrusion speed value se5 at the fifth thick point Tp5 located between the second thick point Tp2 and the thick central region Tp3.

the first thick section extrusion rate value (se1) is greater than the non-thickness section extrusion rate value, the second thick section extrusion rate value (se2) is equal to the non-thickness section extrusion rate value, and the fifth The thick part extrusion rate value (se5) is smaller than the non-thick part extrusion rate value, and the third thick part extrusion rate value (se3) is smaller than the non-thick part extrusion rate value, but the fifth thick part extrusion rate value larger than (se5), and the fourth thick section extrusion rate value (se4) is larger than the non-thick section extrusion rate value but smaller than the first thick section extrusion rate value (se1).

The control unit controls the non-thick part cooling water temperature and the thick part cooling water temperature that the vacuum cooling unit sprays to each of the non-thick part and the thick part, and the thick part cooling water temperature is calculated according to the following Equation 2 characterized.

[Equation 2]

(Where, the Deg_e is the thick part cooling water temperature [°C], the Deg_s is the non-thick part cooling water temperature [°C], the Tref is the reference room temperature [°C], and the Troom is the place where the synthetic resin pipe manufacturing apparatus is driven of room temperature [°C], where sc1 represents the first thick section extrusion rate correction constant for converting the non-thickness section extrusion rate value into the third thick section extrusion rate value or the fourth thick section extrusion rate value. )

According to the embodiments of the present invention, there is provided an apparatus and method for manufacturing a synthetic resin pipe that can ensure uniformity of the thickness of the expanded pipe, reduce the error with the thickness of the straight pipe, and also improve production efficiency through the vacuum cooling method.

Effects according to the technical spirit of the present disclosure are not limited to the above-mentioned effects, and other effects not mentioned will be clearly understood by those skilled in the art from the following description.

1 is a conceptual diagram exemplarily illustrating the configuration of an apparatus for manufacturing a synthetic resin tube according to some embodiments of the present invention.
2 is a view for explaining the control unit of the synthetic resin tube manufacturing apparatus according to some embodiments of the present invention.
3 is a view for explaining a pipe profile and an extrusion rate profile according to some embodiments of the present invention.
4 is a view showing an exemplary synthetic resin pipe including a straight pipe part and an expanded pipe part manufactured by the synthetic resin pipe manufacturing apparatus according to some embodiments of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Advantages and features of the present invention and methods of achieving them will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments published below, but may be implemented in various different forms, and only these embodiments make the publication of the present invention complete, and common knowledge in the art to which the present invention pertains It is provided to fully inform those who have the scope of the invention, and the present invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout.

Unless otherwise defined, all terms (including technical and scientific terms) used herein may be used with the meaning commonly understood by those of ordinary skill in the art to which the present invention belongs. In addition, terms defined in a commonly used dictionary are not to be interpreted ideally or excessively unless clearly defined in particular.

Also, in the present specification, the singular form may also include a plural form unless otherwise specified in the text. As used herein, “comprises” and/or “comprising” refers to the presence of one or more other components, steps, operations and/or elements mentioned. or addition is not excluded.

1 is a conceptual diagram exemplarily illustrating the configuration of an apparatus for manufacturing a synthetic resin tube according to some embodiments of the present invention, and FIG. 2 is a view for explaining a control unit of an apparatus for manufacturing a synthetic resin tube according to some embodiments of the present invention 3 is a view for explaining a pipe profile and an extrusion rate profile according to some embodiments of the present invention, and FIG. 4 is a straight pipe part manufactured by a synthetic resin pipe manufacturing apparatus according to some embodiments of the present invention and It is a view exemplarily showing a synthetic resin tube including an expansion tube.

1 to 4, the synthetic resin pipe manufacturing apparatus 1 includes a silo 110 for storing raw materials, a raw material mixing unit 120 for uniformly mixing raw materials in a pellet or bead state, and synthetic resin in a molten state. The extrusion unit 200 for continuously forming a product having a specific cross section by passing a die of a specific shape by compressing the molding material, a vacuum cooling unit 300 for cooling the molded base pipe, and the cooled base pipe may include a control unit 220 for controlling the extruding condition of the cutting unit 400 and the extruding unit 200 and the cooling condition of the vacuum cooling unit 300 to form a unit synthetic resin pipe by cutting and expanding the tube, and the extruding unit is extruded It may include an extrusion line conveyor for conveying the base tube that has been out.

As described above, the synthetic resin pipe 10 manufactured according to the synthetic resin pipe manufacturing apparatus 1 of the present invention is formed integrally with the straight pipe part 10s and the straight pipe part, and the inner diameter is expanded to a pipe diameter corresponding to the outer diameter of the straight pipe part. It is configured to include the expansion tube (10e). However, it goes without saying that the synthetic resin tube may be cut and processed into a synthetic resin tube consisting only of a straight tube portion and a synthetic resin tube consisting only of an expanded tube portion, if necessary.

On the other hand, the non-thick part described herein may be a region substantially corresponding to the straight pipe part of the synthetic resin pipe in which the manufacturing process is completed, and the thick part to the expanded pipe part of the synthetic resin pipe in which the manufacturing process is completed.

The synthetic resin pipe 10 may be formed of a synthetic resin composition in which various materials for enhancing various piping properties are added to polyvinyl chloride (PVC, PolyVinyl Chloride) resin. For example, the synthetic resin composition may include a PVC resin, an impact modifier, a filler, a stabilizer, and other additives. However, it goes without saying that the synthetic resin tube 10 of the present invention is not limited to the synthetic resin composition to be described later.

The impact modifier may be at least one of a silicon-based impact modifier, an acrylonitrile butadiene styrene (ABS)-based impact modifier, a chlorinated polyethylene (CPE)-based impact modifier, and a methyl methacrylate butadiene styrene (MBS)-based impact modifier. In particular, the impact modifier may be a composition in which a CPE (chlorinated polyethylene)-based impact modifier and MBS (methylmethacrylate butadiene styrene)-based impact modifier are combined. Specifically, the impact modifier is a combination of a CPE (Chlorinated Polyethylene)-based impact modifier and MBS (methyl methacrylate butadiene styrene)-based, CPE-based: MBS-based addition ratio of 6:4 to 8:2 by making the It is possible to produce a synthetic resin composition with excellent low-temperature impact strength and low extrusion resistance in the extrusion molding process while maintaining excellent tensile strength.

As a filler, in order to improve the abrasion resistance of the synthetic resin tube, metal soap made of aluminum, iron, titanium or cobalt, glass fiber (long fiber of 2 to 100 mm) and calcium carbonate mixed in a weight ratio of 6: 4 can be used. . By using calcium carbonate as a filler, it is possible to not only lower the production cost, but also improve the formability and reduce the wear of the mixing processing equipment. In addition, in the case of calcium carbonate, since the particle size adjustment range is wide and it is easy to use, the inner wall 120 is formed using a synthetic resin composition including a filler containing calcium carbonate having a particle size of less than 0.1 μm. Impact resistance can be enhanced by dispersing the applied impact.

A heat stabilizer can be used as a stabilizer. Specifically, the heat stabilizer may be an organotin-based stabilizer such as organotin mercapto-based, organotin malate-based, organotin laurate-based stabilizer, calcium zinc-based stabilizer, fatty acid-based stabilizer, or the like.

The synthetic resin tube 10 molded from the synthetic resin composition as described above can not only obtain a strength-reinforcing effect, but also lower the extrusion resistance to increase the extrudability.

In some embodiments, as other additives, a powder obtained by graft polymerization of sintered glass powder, graphene powder, and/or silicon and acryl may be further included. Graphene powder is a component for improving the strength of the propulsion tube, as well as improving long-term durability and contamination resistance. The graphene (grapene) refers to a single layer separated from graphite having a layered structure stacked in hundreds of thousands to millions or more by van der Waales force, etc., but in the embodiment of the present invention, graphene is Such a single layer of graphite or several to several tens of layers of graphite (similar graphene) may be used.

The single-layer graphene separated from the graphite has very high physical and chemical stability, the strength is about 200 times greater than that of steel, and the thermal conductivity is about 2 times or more better than that of diamond, and due to its superhydrophobicity, It has the property of preventing access. Therefore, when such graphene is mixed with a PVC resin, strength can be significantly increased, and long-term durability, abrasion resistance, and superhydrophobic properties can be imparted. In addition, compared to using such graphene alone in excess, it is possible to obtain a more excellent effect of increasing strength when used in combination with the fired glass powder.

Other additives may also include additives for improving the performance of the extruded part so as to shorten the gelling time of the extruded part and reduce the extrusion load. In an embodiment of the present invention, the additive for improving the performance of the extruded part may include an internal plasticity PVC copolymer. The internal plasticity PVC copolymer has a vinyl chloride-alkyl acrylate polymer having an alkyl group having 1 to 20 carbon atoms in the core, a polyvinyl chloride structure in the shell, and 1 to 20 carbon atoms in the copolymer based on the total weight of the copolymer resin. The content of the alkyl acrylate having an alkyl group of 10 to 50% by weight, may be a material composed of a core-shell structure vinyl chloride-based copolymer resin alone or by mixing.

Referring back to the synthetic resin pipe manufacturing apparatus 1, the control unit 220 of the synthetic resin pipe manufacturing apparatus 1 is stored in the extrusion unit 200 based on the input of the pipe profile data for the synthetic resin pipe 10. The extrusion line conveyor 230 may be controlled so that the synthetic resin composition in the molten state is supplied to the die (not shown). Here, the pipe profile data may be three-dimensional data including the shape of the synthetic resin pipe 10 and various information related thereto (eg, inner thickness, pipe diameter of an expanded pipe, diameter of a straight pipe).

Specifically, as shown in FIGS. 2 and 3, the controller 220 controls the non-thick part extrusion rate based on the thickness of the straight pipe part, the outer diameter of the straight pipe part, and the outer diameter of the expanded pipe part in the pipe profile data of the synthetic resin pipe. After calculating the value (TS_ref) and the thick section extrusion rate profile (see Fig. 3 (b)), the straight pipe section ( 10s) and the expansion of the tube portion (10e) can be controlled to form each.

More specifically, the thick section extrusion rate profile may include a first thick section extrusion rate value (se1) at a first thick section (Tp1) corresponding to one end of the thick section as a cutting point (Cp); a second thick part extrusion rate value (se2) at a second thick part (Tp2) opposite to one end of the thick part and corresponding to the other end of the thick part formed integrally with the non-thick part; a third thick portion extrusion speed value se3 in the thick central region Tp3 located between the first thick point Tp1 and the second thick point Tp2; a fourth thick portion extrusion rate value se4 at the fourth thick point Tp4 located between the first thick point Tp1 and the thick central region Tp3; and a fifth thickening portion extrusion rate value se5 at a fifth thickening point Tp5 located between the second thickening point Tp2 and the thick central region Tp3; wherein the first the thick part extrusion rate value (se1) is greater than the non-thick part extrusion rate value, the second thick part extrusion rate value (se2) is equal to the non-thick part extrusion rate value, and the fifth thick part extrusion rate value The speed value se5 is less than the non-thickness extrusion rate value, and the third thick-section extrusion rate value se3 is smaller than the non-thickness extrusion rate value, and the fifth thick-section extrusion rate value se5. greater than, and wherein the fourth thick section extrusion rate value (se4) is greater than the non-thickness section extrusion rate value but less than the first thick section extrusion rate value (se1).

Here, the extrusion speed is, for example, controlling a drive motor connected to the extrusion line conveyor to increase or decrease the extrusion line conveyor speed, and move at the speed of the extrusion line conveyor at the non-thickness extrusion speed value during non-thickness molding. After controlling the driving motor as much as possible, the speed varies according to the extrusion speed profile of the thick part from the starting point to the ending point of the thick part, and it may mean controlling the driving motor so that the extrusion line conveyor moves.

Meanwhile, the raw data input to the control unit may include composition data and external environment data of the composition constituting the synthetic resin pipe 10 in addition to the pipe profile data.

First, the control unit based on the composition data of the composition constituting the synthetic resin tube 10 - non-thick part extrusion rate value (TS_ref) and non-thick part extrusion rate value (se2) third and fourth thick part extrusion Determine the first and second thick part extrusion speed correction constants ( sc 1 , sc 2 ) for converting to speed values (se3, se4), and based on this, the extrusion unit 200 and the extrusion line conveyor 230 are can be controlled

In addition, the control unit can control the temperature of the cooling water sprayed by the vacuum cooling unit and the degree of vacuum in the vacuum cooling unit based on the extrusion speed (se1 to se5) and the room temperature (Troom) of the place where the synthetic resin pipe manufacturing apparatus is driven. .

Specifically, the temperature of the cooling water sprayed by the vacuum cooling unit and the degree of vacuum in the vacuum cooling unit may be determined to have a relationship of Equation 1 below. Here, the Deg_vc represents the cooling water temperature [°C] sprayed by the vacuum cooling unit, and the P_vc represents the degree of vacuum [kgf/cm ² ] in the vacuum cooling unit.

More specifically, the control unit controls the non-thick part cooling water temperature and the thick part cooling water temperature that the vacuum cooling unit sprays to each of the non-thick part and the thick part, and the thick part cooling water temperature is in Equation 2 below can be calculated accordingly. In Equation 2, where Deg_e is the thick part coolant temperature [℃], Deg_s is the non-thick part coolant temperature [℃], Tref is the reference room temperature [℃], Troom is the room temperature of the place where the synthetic resin pipe manufacturing apparatus is driven [ °C], sc1 represents the first thickening extrusion rate correction constant for converting the non-thickness extrusion rate value into a third thickening extrusion rate value or a fourth thickening extrusion rate value.

Here, when the vacuum cooling unit injects cooling water to the non-thick part, Deg_vc of Equation 1 has the same value as Deg_e of Equation 2, and when the vacuum cooling unit injects cooling water into the thick part, Deg_vc of Equation 1 is It has the same value as Deg_s in Equation 2 above.

According to the control method as described above, the present invention provides an apparatus and method for manufacturing a synthetic resin tube, which can secure the uniformity of the thickness of the thick part, reduce the error with the thickness of the straight pipe, and also improve the production efficiency through the vacuum cooling method. be able to provide

Those of ordinary skill in the art related to the present embodiment will understand that it can be implemented in a modified form within a range that does not deviate from the essential characteristics of the above description. Therefore, the disclosed methods are to be considered in an illustrative rather than a restrictive sense. The scope of the present invention is indicated in the claims rather than the foregoing description, and all differences within the scope equivalent thereto should be construed as being included in the present invention.

Claims (7)

In the apparatus for manufacturing a synthetic resin pipe,
an extrusion unit for extruding the synthetic resin composition for forming the synthetic resin tube into the base tube;
a vacuum cooling unit for cooling the extruded base tube in a vacuum atmosphere;
a cutting part for cutting the vacuum-cooled base pipe to form a unit synthetic resin pipe; and
A control unit for controlling the extrusion condition of the extrusion unit and the cooling condition of the vacuum cooling unit;
The control unit controls the extrusion speed of the extrusion unit based on the pipe profile data of the synthetic resin pipe, and the cooling water temperature and the Controls the degree of vacuum in the vacuum cooling unit,
The temperature of the cooling water sprayed by the vacuum cooling unit and the degree of vacuum in the vacuum cooling unit have a relationship of the following Equation (1), Synthetic resin pipe manufacturing apparatus.
[Equation 1]

(Here, the Deg_vc represents the cooling water temperature [℃] sprayed by the vacuum cooling unit, and the P_vc represents the degree of vacuum [kgf/cm ² ] in the vacuum cooling unit.)
delete delete delete delete delete delete

Images