KR101490813B1 - manufacturing method for polypropylene transparent vessel for sterilization and manufacturing apparatus thereof - Google Patents

Abstract

TECHNICAL FIELD The present invention relates to a method for producing a transparent hollow polypropylene container for sterilization and an apparatus for producing the same. A method for manufacturing a transparent hollow polypropylene container for sterilization according to the present invention comprises the steps of melting a polypropylene resin in an injection molding machine and molding and injecting the polypropylene resin into a mold to form a preform; Cooling the preform; Stabilizing the cooled preform; Passing the stabilized preform through a heating zone provided with first to eighth heating lamps and heating the preform; And blowing the heated preform. As a result, it is possible to manufacture a highly transparent hollow container without adding a nucleating agent, and thus it can be used as a next-generation drug storage container which is light in weight, easily recycled, and economically inexpensive.

Description

TECHNICAL FIELD [0001] The present invention relates to a hollow polypropylene hollow hollow container for sterilization,

TECHNICAL FIELD The present invention relates to a method for producing a transparent hollow polypropylene container for sterilization and an apparatus for producing the same. More particularly, the present invention relates to a method for producing a sterile polypropylene hollow hollow container in which a high transparency container to which a nucleating agent is not added, using a polypropylene resin, and a manufacturing apparatus thereof.

Generally, it is known that a container made of a polyolefin resin such as a polypropylene resin has excellent rigidity, heat resistance, and chemical resistance, but has poor transparency and low impact resistance. Various improvements have been developed to solve these problems. For example, a resin composition prepared by blending straight-chain polyethylene and an elastomer component with a polypropylene resin, a resin composition obtained by blending an ethylene polymerization product with polypropylene, a blend of a polymerization product of 3-methylbutene-1 with a polypropylene resin And a resin composition (Japanese Patent Laid-Open No. 3-14852).

However, the container made of the proposed polyolefin-based resin has the problem that the impact strength is increased but the transparency is lowered. If the transparency is improved, there is a problem of bad odor and reduced impact strength. There is a problem that when the container is heated and sterilized through the conventional technique, the transparency is lowered so that contents contained in containers such as medicines are difficult to see.

Or when the nucleating agent is blended in the resin of the container in order to improve the transparency of the container, the productivity of the container may be deteriorated due to a rapid crystallization rate. If the additive is odorous or if the container is a hollow container for containing medicines, There may arise a problem that the nucleating agent or the like is eluted from the resin into the contents.

Accordingly, it is an object of the present invention to provide a method for producing a hollow polypropylene hollow container for sterilization, which can produce a hollow container having high transparency by a molding and blowing process of a polypropylene resin to which no nucleating agent is added do.

The object of the present invention can be achieved by a method for molding a polypropylene resin, which comprises melting a polypropylene resin in an injection molding machine and molding and injecting the polypropylene resin into a mold to form a preform; Cooling the preform; Stabilizing the cooled preform; Passing the stabilized preform through a heating zone provided with first to eighth heating lamps and heating the preform; And blowing the heated preform. The present invention also provides a method for producing a hollow polypropylene hollow container for sterilization.

The polypropylene preferably has no nucleating agent added thereto.

The polypropylene resin can be melted at 230 to 240 캜.

The cooling may be performed at 20 ° C for 10-20 seconds.

In the step of stabilizing the preform, the stabilization can be stabilized at 20 to 25 캜 for 12 to 120 hours.

It is preferable that the heating zone is six heating zones.

The heating zone preferably has a length of 75 to 80 cm.

The heating time is preferably 210 to 240 seconds after passing through the heating zone.

It is preferable that the preblowing process is performed before the blowing process.

On the other hand, an injection part for melting a polypropylene resin to form a preform; A preform joining unit coupled to the preform; A heating unit including a heating zone in which first to eighth heating lamps for heating the preform are installed; And a blowing unit for blowing the heated preform. The above object is also achieved by an apparatus for producing a transparent hollow polypropylene container for sterilization.

The heating zone is preferably a heating zone of six sections.

The heating zone preferably has a length of 75 to 80 cm.

The preform joining portion may include a compressed air injection portion.

The preform joining portion may further include an elastic portion for separating the hollow container from the preform joining portion.

INDUSTRIAL APPLICABILITY According to the process for producing a hollow polypropylene hollow container for sterilization according to the present invention and its apparatus, a transparent hollow container of polypropylene with high transparency can be produced.

According to the method of manufacturing a transparent hollow polypropylene container and the apparatus for producing the sterile polypropylene hollow container according to the present invention, transparency which is almost the same level as that of a glass bottle can be obtained without addition of a nucleating agent, light weight, easy recycling, Can be used as a next-generation drug storage container.

1 is a perspective view illustrating a process of passing a preform according to an embodiment of the present invention through a heating zone.
2 is a top view of a blowing apparatus according to an embodiment of the present invention.
3 is a detailed cross-sectional view of a preform joining part according to an embodiment of the present invention.
4 is a perspective view of a heating lamp assembly according to an embodiment of the present invention.
5 is a cross-sectional view illustrating a state in which a heating lamp stand and a preform are arranged according to an embodiment of the present invention.

Hereinafter, a method for manufacturing a sterile polypropylene hollow hollow container according to the present invention and an apparatus for producing the same will be described in detail with reference to the accompanying drawings.

The method of manufacturing a hollow hollow polypropylene container for sterilization according to the present invention comprises the steps of melting a polypropylene resin in an injection molding machine and molding and injecting the polypropylene resin into a mold to form a preform; Cooling the preform; Stabilizing the cooled preform; Passing the stabilized preform through a heating zone provided with first to eighth heating lamps and heating the preform; And blowing the heated preform.

An apparatus for manufacturing a sterile polypropylene hollow hollow container which can be implemented in the present invention comprises: an injection part for melting a polypropylene resin to form a preform; A preform joining unit coupled to the preform; A heating unit including a heating zone in which first to eighth heating lamps for heating the preform are installed; And a blowing unit for blowing the heated preform.

FIG. 1 is a perspective view showing a process of passing a preform according to an embodiment of the present invention through a heating zone, and FIG. 2 is a plan view of a blowing apparatus according to an embodiment of the present invention. 1 and 2, an apparatus for producing a sterile polypropylene hollow hollow container of the present invention includes an injection apparatus (not shown) and a blowing apparatus 10. The injection apparatus melts a polypropylene resin in an injection cylinder (not shown), and injects it into a mold (not shown) to mold the preform 20. The temperature at which the polypropylene resin is injected may be about 230 to 240 캜.

After the polypropylene resin is injected into the preform 20, the preform 20 is stabilized. In order to stabilize the preform 20, it is cooled at a temperature of 20 DEG C for 10 seconds to 20 seconds. The preform 20 thus cooled is stabilized in the room at 20 to 24 DEG C for at least 12 hours. The stabilization time is preferably at least 12 hours, and the shelf life can be stabilized until about 6 months. Due to the stable crystal structure of the preform 20, the polypropylene resin molded product formed using the preform 20 can have high transparency through the stabilization process.

In FIG. 1, the blowing apparatus 10 includes a transfer unit 40. The transfer unit 40 transfers the loaded preform 20 and the transfer unit 40 allows the preform 20 to pass through the heating zones 100, 200, 300, 400, 500 and 600. The transfer unit 40 is installed apart from the bottom. The transfer unit 40 includes a plurality of preform assemblies 30 to which the preforms 20 can be coupled.

The transfer unit 40 is connected to the blowing device 10 along a transfer route. A plurality of preform engaging portions 30 along the conveying portion 40 are also disposed along the route of the conveying portion 40. Further, since a plurality of heating zones 100, 200, 300, 400, 500 and 600 are arranged on a certain route, the preforms 20 pass through the heating zones 100, 200, 300, 400, 500 and 600 And is designed to be heated accordingly. The heating zones 100, 200, 300, 400, 500, 600 according to an embodiment of the present invention may have a length of 75 to 80 cm.

The plurality of preforms 20 coupled to the plurality of preform assemblies 30 are connected to the heating lamps 110, 120, 210, and 220 installed in the heating zones 100, 200, 300, 400, , 310, 320, ...). The heating lamps 110, 120, 210, 220, 310, 320 ... are provided in the heating zones 100, 200, 300, 400, 500 and 600, Respectively. The heating lamps 110, 120, 210, 220, 310, 320 ... in the heating zones 100, 200, 300, 400, 500 and 600 are provided with a plurality of heating lamps 111, 121, 112, , 113, 123 ...). The heating lamps 111, 121, 112, 122, 113, 123, ... according to an embodiment of the present invention may include first heating lamps 111, 121, 211, 221, 311, 321, (118, 128, 218, 228, 318, 328 ...). The spacing of each of the heating lamps 111, 121, 112, 122, 113, 123, ... is arranged at regular intervals of 15 to 20 mm, but it is not necessarily required to maintain uniform intervals, . In the heating lamps 111, 121, 112, 122, 113, 123, etc., various heat can be emitted by adjusting the power of the power source, . The preform 20 is blown by compressed air discharged from an air injecting unit (not shown) included in the preform joining unit 30.

3 is a cross-sectional view of a preform joining unit 30 according to an embodiment of the present invention. 3, the preform joining portion 30 includes a fastening portion 31 which is in contact with the inside of the preform 20 and can be coupled to the outside concave portion of the preform 20. As shown in Fig. The preform (20) further includes a compressed air supply part (32) for supplying compressed air to the inside of the preform (20). In addition, the preform joining portion includes an elastic portion 33, which plays a role of pushing out the blown hollow container and separating the hollow container from the coupling portion 31. The elastic body 33 is connected to a power transmission device (not shown) separately for separating, and is returned to its original position so as to be coupled with the preform 20 again after being pushed.

The preform 20 is coupled to a rotating member (not shown) rotating in a predetermined direction so that the preform 20 passes through the heating zones 100, 200, 300, 400, 500, And can be uniformly heated by the heating lamps 111, 121, 112, 122, 113, 123, .... A system for adjusting the rotation speed may be provided, and a device for adjusting the rotation direction of the rotation direction clockwise or counterclockwise may be additionally provided. In the case of passing through the heating zones 100, 200, 300, 400, 500 and 600 without rotation, only the surface facing the heating lamps 111, 121, 112, 122, 113, 123 ... is selectively heated A transparent hollow vessel can not be successfully manufactured.

The preform (20) is heated by a plurality of heating zones (100, 200, 300, 400, 500, 600). The preform 20 is heated while passing through the heating zones 100, 200, 300, 400, 500, and 600 while being transported by the transfer unit 40 spaced from the bottom. More specifically, the preform 20 is heated while passing through six heating zones 100, 200, 300, 400, 500 and 600. Each of the heating zones 100, 200, 300, 400, 500, and 600 may heat the preform 20 stepwise. The preforms 20 are heated while passing through the two heating lamps 110, 120, 210, 220, 310, 320 ... provided in the heating zones 100, 200, 300, 400, 500 and 600 . The heating lamps 111, 121, 112, 122, 113, 123 ... can heat the preforms 20 to a temperature higher than the softening point of the polypropylene preforms 20. The heating lamps 111, 121, 112, 122, 113, 123, etc. may heat the preform 20 at different temperatures at a temperature of 135 ° C or higher. More specifically, the heating lamps 111, 121, 112, 122, 113, 123, etc. heat the preform 20 to about 135 to 160 ° C.

FIG. 4 is a perspective view of a heating lamp stand according to an embodiment of the present invention, and FIG. 5 is a cross-sectional view illustrating a state in which a heating lamp stand and a preform are disposed. 4 and 5, the preform 20 is heated in each of the heating zones 100, 200, 300, 400, 500 and 600 for a predetermined period of time. For example, it is heated in the first heating zone 100 for 10 seconds to 20 seconds. The first to eighth heating lamps 111, 121, 112, 122, 113, 123 ... constituting the heating lamp units 110, 120, 210, 220, 310, The outputs may be different from each other. The intensity of the output of each of the heating lamps 111, 121, 112, 122, 113, 123 ... may be expressed by a voltage V. When the intensity of the driving voltage is different, 112, 122, 113, 123,...), Heat according to the intensity of the applied driving voltage is emitted to partially heat the preforms 20 differently.

The first to eighth heating lamps 111, 121, 112, 122, 113, 123, ..., when the preforms 20 pass through the respective heating zones 100, 200, 300, 400, 500, 120, 210, 220, 310, 320, ..., which are arranged opposite to each other including the heating lamps 110, 120,.

The heating lamps 111, 121, 112, 122, 113, 123 ... serve to uniformly maintain the temperature of the space in which the preforms 20 are disposed. The temperature of the space can be differentiated according to the intensity of the driving voltage and the temperature of the space becomes higher when a higher driving voltage is applied.

The drive voltage applied to the specific heating lamps 111, 121, 112, 122, 113, 123, ... of the heating lamp bands 110, 120, 210, 220, 310, By adjusting, the temperature of the space can be adjusted. For example, if the driving voltage of each of the second heating lamps 112 and 122 in the two heating lamp bands 110, 120, 210, 220, 310, 320 ... in the first heating zone 100 is 90 V, The portion of the preform 20 passing through the portion corresponding to the height of the second heating lamps 112 and 122 is most affected by the heat generated by the driving voltage. Likewise, the preforms 20 passing different height ranges can be differentially heated by different driving voltages of the other heating lamps 111, 121, 112, 122, 113, 123, and so on. When the driving voltages of the heating lamps 111, 121, 112, 122, 113, 123, ... are different from each other, the transparency of the hollow container is different.

The output of the first heating lamp is 170 to 180 V, the output of the second heating lamp is 85 to 95 V, the output of the third heating lamp is 120 to 130 V, and the output of the fourth heating lamp is a driving voltage according to an embodiment of the present invention. The output of the fifth heating lamp is 130 to 140V, the output of the sixth heating lamp is 130 to 140V, the output of the seventh heating lamp is 80 to 90V, and the output of the eighth heating lamp is 30 to 35V.

The output of the first heating lamp is 180 to 190 V, the output of the second heating lamp is 100 to 110 V, the output of the third heating lamp is 140 to 150 V, the driving voltage of the fourth heating lamp The output of the fifth heating lamp is 150 to 160 V, the output of the sixth heating lamp is 140 to 150 V, the output of the seventh heating lamp is 100 to 110 V, and the output of the eighth heating lamp is 45 to 50 V .

The output of the first heating lamp is 150 to 160 V, the output of the second heating lamp is 180 to 190 V, the output of the third heating lamp is 160 to 170 V, the driving voltage of the fourth heating lamp The output of the fifth heating lamp is 160 to 170 V, the output of the sixth heating lamp is 150 to 160 V, the output of the seventh heating lamp is 120 to 130 V, the output of the eighth heating lamp is 60 to 70 V to be.

The output of the first heating lamp may be 160 to 170 V, the output of the second heating lamp may be 210 to 220 V, the output of the third heating lamp may be 180 to 190 V, the fourth heating lamp may be used as the driving voltage according to another embodiment of the present invention, The output of the fifth heating lamp is 170 to 180 V, the output of the sixth heating lamp is 170 to 190 V, the output of the seventh heating lamp is 120 to 130 V, the output of the eighth heating lamp is 100 to 110 V to be.

The above-described output conditions can be transferred by heating the preforms 20 in the first to sixth heating zones with the same output.

In one embodiment of the present invention, the preform 20 conveyed by the conveying unit 40 is made of a highly transparent material when blowing the first to sixth heating zones 100, 200, 300, 400, 500, The feed rate can be adjusted to be a polypropylene hollow vessel. Preferably, the heating time through the first to sixth heating zones 100, 200, 300, 400, 500 and 600 is 210 seconds to 240 seconds.

The heated preform 20 may be blown by air injection. The mold temperature during blowing may be between 30 degrees and 40 degrees. The preforms 20 having passed through the first to sixth heating zones 100, 200, 300, 400, 500 and 600 are transferred to a mold and blown at a high pressure.

More preferably, a pre-blowing process may precede the blowing process to blow into a highly transparent polypropylene hollow container. At this time, the pressure of the compressed air in the preliminary blowing process is 5 to 7 kg / cm ² , and more preferably 6 kg / cm ² of compressed air is preliminarily blown for 0.3 to 0.6 seconds.

After the preliminary blowing process, the blowing process is performed at a high pressure. The pressure of the compressed air in the blowing process is 13 to 15 kg / cm ² , the compressed air is injected for 2 to 4 seconds and injected once to form a high transparency product.

The method and apparatus for producing a hollow polypropylene hollow container according to an embodiment of the present invention can be manufactured as a hollow container having high transparency and high heat resistance. The hollow container is suitable as a medicament container.

The transparent hollow container of polypropylene of the present invention can exhibit a high degree of transparency at a glass vial level without addition of a nucleating agent, thereby eliminating the problem of foreign matters being eluted into the drug. The propylene container is advantageous in that it can be regenerated and does not show any substances that can adversely affect the natural environment. In addition, the polypropylene container produced by the above-described production method and apparatus has an advantage of not only having high transparency but also improving lubrication resistance and surface smoothness.

The present invention will be described in more detail with reference to the following examples. It is to be understood that the scope of the present invention is not limited by these examples in accordance with the gist of the present invention, and it is to be understood by those skilled in the art that the present invention is not limited thereto It will be obvious.

Common Manufacturing Example: Preform Molding Process

The polypropylene resin was melted in an injection cylinder at a temperature of about 235 DEG C and injected into a mold to form a preform, and no nucleating agent was added. The preform was cooled at a temperature of 20 DEG C for 15 seconds. The thus formed preform was stabilized in a room at 22 캜 for 12 hours.

Example 1: Blowing Step 1

(1) The preforms formed thereafter were put into the alignment conveying device and transferred to the conveying device carrier.

(2) The preform transferred from 170 to 175 carriers was passed through a heating zone consisting of eight heating lamps.

③ There are 6 heating zones, and the preform passing through the heating zone is continuously heated in a constant direction at constant speed.

In each of the heating zones, a first heating lamp stand and a second heating lamp stand were arranged. The first heating lamp base and the second heating lamp base are opposed to each other and the preform passes between the two heating lamp bases. Each heating lamp stand has eight heating lamps vertically arranged.

④ The spacing of the heating lamp to heat the preform is 15 mm, and the driving voltage is

First High Power Heating Lamp: 174 V

2nd High Power Heating Lamp: 91 V

Third High Power Heating Lamp: 124 V

Fourth High Power Heating Lamp: 145 V

5th High Power Heating Lamp: 136 V

No. 6 High Power Heating Lamp: 134 V

7th High Power Heating Lamp: 82 V

The eighth high output heating lamp was 35 V.

(5) The preform charged into the carrier was heated in a heating zone 6 of 770 mm over 230 seconds, transferred to a mold, and blown at a high pressure.

(6) The preliminary blowing was carried out at a pressure of 6 kg / cm ² for 0.5 seconds, and then the mixture was injected once at a pressure of 15 kg / cm ² for 3 seconds to prepare a hollow container. At this time, the mold temperature of the blowing section was maintained at a temperature of 35 캜.

Example 2: Blowing process 2

The driving voltage was changed under different conditions while the same conditions as in Example 1 were obtained.

First High Power Heating Lamp: 181 V

2nd High Power Heating Lamp: 108 V

Third High Power Heating Lamp: 147 V

Fourth High Power Heating Lamp: 155 V

5th High Power Heating Lamp: 156 V

6th High Power Heating Lamp: 147 V

Seventh High Power Heating Lamp: 104 V

The eighth high output heating lamp was 45 V.

Example 3: Blowing process 3

The driving voltage was changed under different conditions while the same conditions as in Example 1 were obtained.

First High Power Heating Lamp: 155 V

Second High Power Heating Lamp: 180 V

Third High Power Heating Lamp: 170 V

Fourth High Power Heating Lamp: 165 V

5th High Power Heating Lamp: 165 V

6th High Power Heating Lamp: 155 V

Seventh High Power Heating Lamp: 125 V

The eighth high output heating lamp was 65 V.

Example 4: Blowing process 4

The driving voltage was changed under different conditions while the same conditions as in Example 1 were obtained.

First High Power Heating Lamp: 165 V

Second High Power Heating Lamp: 210 V

Third High Power Heating Lamp: 185 V

Fourth High Power Heating Lamp: 185 V

5th High Power Heating Lamp: 175 V

6th High Power Heating Lamp: 180 V

Seventh High Power Heating Lamp: 125 V

The eighth high output heating lamp was 105 V.

Experimental results: Examples 1 to 4

The transparency of the polypropylene hollow container formed by varying the driving voltage of the first to eighth heating lamps was measured and shown in Table 1 below.

division Transparency (Haze,%) Example 1 2.5 Example 2 3.6 Example 3 5.1 Example 4 7.8

In Examples 1 to 4, the transparency varied from 2.5 to 7.8%, and it was confirmed that the polypropylene hollow container having the highest transparency was produced under the conditions of Example 1.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments.

10: blowing device 20: preform
30: preform joining part 31:
32: supply part 33: elastic part
40:
100, 200, 300, 400, 500, 600: heating zone
110, 120, 210, 220, 310, 320:

Claims (14)

Melting a polypropylene resin in an injection molding machine, and molding and injecting the polypropylene resin into a mold to form a preform;
Cooling the preform;
Stabilizing the cooled preform;
A first heating lamp driven by a first driving voltage, a second heating lamp driven by a second driving voltage lower than the first driving voltage, and a second driving lamp driven by the second driving voltage, A fourth heating lamp driven by a third driving voltage higher than the first driving voltage and driven by a fourth driving voltage lower than the first driving voltage and higher than the third driving voltage, Fifth and sixth heating lamps driven by a fifth driving voltage lower than the first driving voltage and higher than the third driving voltage and seventh and eighth heating lamps driven by a sixth driving voltage lower than the second driving voltage, Passing through the installed heating zone and heating; And
And blowing the heated preform. The method of producing a hollow polypropylene hollow container for sterilization according to claim 1,
The method according to claim 1,
Wherein the polypropylene is free of a nucleating agent.
The method according to claim 1,
Wherein the polypropylene resin is melted at 230 to 240 占 폚.
The method according to claim 1,
Wherein the cooling step is performed at 20 캜 for 10 to 20 seconds.
The method according to claim 1,
Wherein the step of stabilizing the preform is stabilized at 20 to 25 DEG C for 12 to 120 hours.
The method according to claim 1,
Wherein the heating zone is six heating zones. ≪ RTI ID = 0.0 > 15. < / RTI >
The method according to claim 6,
Wherein the heating zone has a length of 75 to 80 cm. ≪ RTI ID = 0.0 > 11. < / RTI >
The method according to claim 1,
Wherein the heating time is from 210 to 240 seconds after passing through the heating zone.
The method according to claim 1,
Wherein the preliminary blowing step is preceded by the preliminary blowing step before the blowing step.
An injection part for melting the polypropylene resin to form a preform;
A preform joining unit coupled to the preform;
A first heating lamp driven by a first driving voltage for heating the preform; a second heating lamp driven by a second driving voltage lower than the first driving voltage; A fourth heating lamp driven by a third driving voltage higher than the first driving voltage and driven by a fourth driving voltage lower than the first driving voltage and higher than the third driving voltage, Fifth and sixth heating lamps driven by a fifth driving voltage lower than the first driving voltage and higher than the third driving voltage and seventh and eighth heating lamps driven by a sixth driving voltage lower than the second driving voltage, A heating unit including an installed heating zone;
And a blowing unit for blowing the heated preform.
11. The method of claim 10,
Wherein the heating zone is a heating zone of six sections.
11. The method of claim 10,
Wherein the heating zone has a length of 75 to 80 cm. ≪ RTI ID = 0.0 > 8. < / RTI >
11. The method of claim 10,
Wherein the preform joining portion comprises a compressed air injecting portion.
11. The method of claim 10,
Wherein the preform joining portion further comprises an elastic portion for separating the hollow container from the preform joining portion.

Images