JPH04147837A - Manufacture of tube container - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention mainly relates to a method of manufacturing a tube container in which a paste-like material is filled.

``Prior Art'' A tube container has a body made of a cylindrical body made of laminated sheets for molding the body, and a thermoplastic synthetic resin that is compressed or injection molded onto one end of the body. It is formed by a head consisting of a mouth and neck part and a shoulder part connected to the mouth and neck part.

Tube containers with high gas barrier properties are required to improve the storage performance of the contents, and for the gas barrier properties of the body, a laminated sheet with metal foil laminated as a material for forming the body is required. In addition, for the truncated conical shoulder, a polyolefin resin layer is laminated on the inner peripheral surface of the shoulder on both the front and back sides of the metal foil. The gas barrier property of the shoulder portion is improved by stacking molded products, usually called rondels, which are formed by punching out a truncated conical shape from laminated sheets.

[Problems to be Solved by the Invention] In the case of the body made of a laminated sheet in which polyolefin resin layers are laminated on both the front and back surfaces of the metal foil described above, it is necessary to apply a sealing material to the bonded portion of the laminated sheets. The metal foil in the laminated sheet is prevented from being exposed to the inner peripheral surface of the container by interposing a tape or by using an inverted adhesive part.

However, rondels that are attached to the inner circumferential surface of the synthetic resin shoulder are left exposed to the inner circumferential surface of the container, so they cannot be filled with particularly acidic fillers. In such cases, the metal foil in the rondelle is likely to be corroded by the filling material, which is a factor that deteriorates the storage performance of the filling material.

In contrast, the present invention provides a tube container in which the metal foil on the end face of the rondel laminated on the inner circumferential surface of the shoulder of the tube container is hidden, thereby providing a high degree of gas barrier.
To provide a method for easily manufacturing a tube container having extremely excellent storage performance without fear of corrosion of metal foil due to filling material.

``Means for Solving the Problems J'' The method for producing a tube container of the present invention includes a body made of a cylindrical body formed of a laminated sheet, and a gold I!!: polyolefin resin on both the front and back sides of the foil. A rondel consisting of a truncated cone-shaped molded body made of laminated sheets is connected to the inner peripheral surface of the upper end of the body made of a cylindrical body and the lower end of the truncated conical molded body made of a cylindrical body. After inserting it into a mold for compression molding or injection molding so that a gap exists between it and the outer peripheral surface, compression molding or injection molding of thermoplastic synthetic resin is performed to form a mold for the mouth and neck area. A first step of forming a synthetic resin head for a tube container consisting of a continuous truncated conical shoulder, and a synthetic resin head and a body of a cylindrical body obtained in the first step. By setting the tube in a retainer in which a coil is disposed at a position corresponding to the synthetic resin shoulder of the tube, and passing a high frequency current through the coil disposed in the retainer, the above-mentioned method can be achieved. A subsequent step in which the metal foil in the conical rondelle is heated, and the metal foil exposed on both end faces of the rondelle is covered and solidified by the melt flow of polyolefin resin on both the front and back surfaces of the metal foil. Consisting of

The step of obtaining a tube container with a head made of synthetic resin and a body of a cylindrical body, which is the first step of the method for manufacturing a tube container of the present invention having the above structure, is different from the conventional molding of this type of tube container. It consists of the same process.

That is, for example, by using a body forming material consisting of a laminated sheet in which synthetic resin layers are laminated on both the front and back sides of metal foil, the inner peripheral surface layer is formed of an olefin resin layer made of polyethylene or polypropylene. The body of the cylindrical body,
A truncated cone-shaped molded product obtained by subjecting a laminated sheet in which polyolefin resin layers are laminated to the front and back surfaces of metal foil to cold-open molding such as air pressure molding or press molding, and then punching the sheet. With the rondel inserted into a predetermined mold for compression molding or extrusion molding, It consists of molding by compression molding or injection molding of synthetic resin.

Note that Rondeno, which is made of a truncated cone-shaped molded body, improves the gas barrier properties of the shoulder made of synthetic five resin that is injection molded onto the cylindrical body.
A layer of olefin resin such as ethylene or polypropylene is laminated on both the front and back sides of the foil, and an outer shell that follows the inner circumferential surface of the shoulder of synthetic resin is formed by compression molding or injection molding. It is obtained by molding a shaped body into a molded body, and the one used is exactly the same as the conventional opening used in this type C tube container.

The retainer in which the tube obtained in the previous step is set, consisting of a joint made of a synthetic resin head and a cylindrical body, has a shoulder part and an upper part of the body. A coil is used that is supported by a retainer and has a coil arranged around a portion corresponding to the shoulder.

In the latter step, the tubes obtained in the earlier step are set in a pair of such retainers, and then a high frequency current is passed through the coil disposed in the retainer to generate heat in the metal foil of the rondel, and the surface of the rondel is heated. The olefin resin layer forming the back layer is melted, and the metal foil exposed on the end surface of the rondelle is covered with the molten flow of the polyolefin resin.

Note that the metal foil used in the laminated sheet formed into a rondelle has a thickness of about 10 to 100 microns, in view of the relationship between the gas barrier performance obtained by the rondelle and the molding performance of the laminated sheet.

In addition, the polyolefin resin layer on both the front and back surfaces of the metal foil has a surface thickness that is equal to or greater than the thickness of the metal foil so that the resin layer melts and flows out to sufficiently cover the end surface of the metal foil. Preferably, they are formed as a layer and a back layer.

"Example" The specific structure of the method for manufacturing a tube container of the present invention will be described below with reference to Examples.

Example 1 In FIG. 1, a cylindrical body 2 made of a laminated sheet containing AI2 foil, Aj2 foil with a thickness of 50μ, a polyethylene resin layer with a thickness of 150μ laminated on the surface of the 11 foil, and the back side of the AΩ foil. A laminated sheet for a rondelle consisting of a polyethylene resin layer with a thickness of 150μ laminated on a rondelle 6 is subjected to pressure molding and subsequent punching. The mouth and neck part 3 is inserted into a predetermined position in a mold, and is formed between the cylindrical body 2 and the rondelle 6 by injection molding of polypropylene resin.
and a tube 7 to which a polypropylene resin head 5 consisting of a truncated conical shoulder portion 4 connected to the mouth and neck portion 3 is joined.
I got it.

Next, after setting the tube 7 obtained by the above-mentioned process on the retainer indicated by the symbol R, a high frequency current is passed through the coil 8 disposed on the retainer R, and the Aρ foil in the rondelle 6 is generate heat, Rondel 6
By melting the polyethylene resin forming the front and back layers of the rondelle 6 and the shoulder part 4, the rondelle 6 and the shoulder part 4 are bonded by hot sanding, and the AJ2 foil exposed on the end surface of the rondelle 6 is bonded.
Both the front and back surfaces of the foil were coated and solidified by the melt flow of polyethylene resin to obtain a tube container 1, which is the object product of the present invention and is designated by reference numeral 1 in FIG.

In addition, in FIG. 2, the reference numeral 9 indicates the rondelle in the tube container 1, and on the end face of the rondelle 9, the AJ2 foil a forming the core layer of the rondelle 9 is the polyethylene resin forming the surface layer. When layered, it shows a state in which it is hidden by melting and solidification with the polyethylene resin layer C forming the back layer.

"Operations and Effects of the Invention" In the method for manufacturing a tube container of the present invention, in order to improve the gas barrier properties of the shoulder made of synthetic resin obtained by compression molding or injection molding, the inner surface of the shoulder is made of metal. After obtaining a tube in which a rondel made of a laminated sheet provided with foil is laminated, the above-mentioned tube is set in a retainer in which a coil is disposed at a position corresponding to the shoulder of the tube, and further, the retainer is - By passing a high-frequency current through the coil disposed in the rondelle, the metal foil in the rondelle is heated, and the metal foil exposed on the end face of the rondelle is melted by the polyolefin resin on the front and back surfaces of the metal foil. By laminating the rondel on the inner circumferential surface of the shoulder of the container, it not only provides a high degree of gas barrier property, but also completely prevents the exposure of the metal foil on the edge of the rondel. Ru.

Therefore, in the method for manufacturing a tube container of the present invention, there is no risk of corrosion of the metal foil due to the filling material, and a tube container having extremely excellent storage performance can be easily obtained.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view illustrating the main parts of the process of the tube container manufacturing method of the present invention, and FIG. 2 is a cross-sectional view showing the main parts of the tube container obtained by the tube container manufacturing method of the present invention. be. 1. A tube container obtained by the method for producing a tube container of the present invention, 2. A cylindrical body forming the body of the tube container, 3. A neck portion, 4. A truncated conical shoulder portion, 5. A neck portion 2. 6: Rondel laminated on the inner circumferential surface of the shoulder of the tube 7; R: Retainer: Tube obtained in the previous step; 8: Retainer;
Coil arranged in R, 9: Rondel laminated on the shoulder of tube container 1, a: L foil forming the center layer of rondelle 8, b: polyethylene resin layer forming the surface layer of rondelle 8, C: Polyethylene resin layer forming the back layer of Rondelle 8. Figure 2

Claims (1)

[Claims] 1. A body made of a cylindrical body made of a laminated sheet, and a truncated cone-shaped molded body made of a laminated sheet in which a polyolefin resin layer is laminated on both the front and back sides of metal foil, into a cylindrical shape. A mold for compression molding or injection molding with a gap between the inner circumferential surface of the upper end of the body and the outer circumferential surface of the lower end of the truncated conical molded body. After inserting the container into the container, a head for the tube container consisting of a neck and a truncated conical shoulder continuous to the neck and neck is molded by compression molding or injection molding of a thermoplastic synthetic resin,
After obtaining a tube consisting of the head and the body of the cylindrical body, the obtained tube is further set in a retainer in which a coil is disposed at a position corresponding to the shoulder of the tube, and the coil is disposed in the retainer. By passing a high-frequency current through the installed coil, the metal foil in the conical molded body is heated, and the metal foil exposed on both end faces of the molded body is heated. A method for manufacturing a tube container, characterized in that both surfaces are coated with a molten flow of polyolefin resin.