JPS5935924A - Production of see-through pipe for hard transparent container - Google Patents

Abstract

PURPOSE:To continuously form a see-through pipe for transparent container free from stepped joints at the outside periphery thereof, by a method wherein a multiplayer transparcnt resin tape adhered to have stepped parts at both side edges is so wound that the stepped parts overlap on each other. CONSTITUTION:Before a pipe-producing step, thin transparent resin films are laminted to produce a multilayer transparent resin tape 2 having a predetermined thickness (t). The resin tape 2 is produced, for example, by a method wherein transparent resin films 1, 1 layered by using a plurality of extremely thin transparent films 1a, 1b, 1a, 1b, 1c are adhered to each other. The thus obtained resin tape 2 is wound around a mandrel 8 in a spiral form. In this case, an angle is set such that the stepped parts 3, 3' provided in the band 2 overlap on each other for each turn, and the surfaces of overlapping stepped parts 3, 3' are adhered concurrently with the spiral winding. The adhesion may be accomplished by an adhesive, a high-frequency welder 9 or the like.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a see-through tube for a rigid transparent container.

Transparent rigid cylindrical containers are widely used as packaging containers for dry foods, clothing, and the like. This container is generally obtained by making a see-through tube, cutting the see-through tube to a predetermined length, and attaching lids to the top and bottom. The resin sheet is rolled into a so-called flat roll, and the overlapping seam is joined at 9I.
4 or high frequency welding was used, which caused the problem of extremely poor productivity.

As a countermeasure for this, a band of transparent resin (?dL*) is wound in a spiral shape so that the edges overlap, and the heavy metal edges are connected to each other.
There are two methods: IiIt or welding.

This method improves productivity. However, since the stepped part of the joint is formed in a spiral shape on the outer periphery of the see-through tube, it looks unsightly and has the disadvantage of losing momentum, which is important for product packaging. Moreover, after cutting to size, when attaching the fish body to the upper and lower ends, a gap is created due to the stepped part of the joint that protrudes from the outer circumferential surface.
It had the disadvantage of poor sealing performance.

The present invention was developed through research in order to eliminate the above-mentioned conventional drawbacks, and its purpose is to obtain a bone canal sheath for a transparent container that has a good appearance, good sealing performance, and efficient bone canal. A new method for manufacturing see-through tubes is provided.

For this purpose, the present invention creates a multilayer transparent resin body of a predetermined thickness by laminating a plurality of transparent resin films in advance so as to have stepped portions on both side edges before pipe manufacturing, and the step portions are polymerized. By spirally winding the tube and joining the stepped portions, a see-through tube without stepped joints is continuously formed on the outer periphery. Hereinafter, the present invention will be explained based on the accompanying drawings.

Figures 1 to 8 show an embodiment of the method for manufacturing a see-through tube for a rigid transparent container according to the present invention. A multilayer transparent resin band 2 having a predetermined thickness t is made by laminating thin transparent resin films.

The multilayer transparent resin band 2 has a thickness of about 17 mm in FIG. 2 (α).
Two transparent resin films 1 and 1 of t are pasted together,
As shown in FIG. 2(b), a plurality of ultra-thin transparent films 1α, 1b, 1α, respectively.

Transparent resin films 1, 1 layered with 1b and 1c
may be pasted. And in any case, the transparent #
The oil films 1, 1 are laminated together with a phase shift in the width direction so that step portions 3°3 of equal width and opposite directions are formed along the side edges of the image. The parts 3, 3 have a thickness approximately equal to that of the multilayer transparent resin body 2.

Although the lamination may be carried out by any method such as the so-called co-extrusion method, in this embodiment, as shown in FIG. Adhesive resin T is applied using an applicator 6 leaving a margin 11, and then the overlapping portion of both transparent resin films 1, 1 is compressed using an IF and contact roll 5 to continuously form a multilayer transparent resin band 2. There is.

Next, in the present invention, the multilayer transparent resin band 2 obtained in the previous step is spirally wound around a Y dredge 8 as shown in FIG. At this time, as shown in Fig. 8α, an angle is set so that the stepped portions 3 and 3' formed on the multilayer transparent resin band 2 overlap for each tone, and the stepped portions 3 and 3' overlap as the spiral is wound. , 30 surfaces are joined. 14 is a joint.

This joining method may be adhesive bonding,
Welding may be performed using a high frequency well 9 as shown in the figure. When using the former adhesive method, it is sufficient to apply adhesive to the stepped portion 3 or 3 just before winding it into a spiral, and when using the latter welding method, a high-frequency well 9 is applied at a position of one or more tangs. etc., and apply high frequency to the 3° 30 step overlap portion.

As a result, the see-through tube 10 is gradually formed along the axial direction of the mandrel 8, but in the case of the present invention, the stepped portion 3.3 having a thickness of 4 times the thickness of the tube body is superimposed in a spiral shape. Because there are no seam protrusions on the inner and outer surfaces, it is flat. It has a +# tubular or cylindrical shape.

In addition, instead of the above method, the present inventor also tried a method of cutting edges in the opposite direction on both sides of a single-layer transparent resin sheet, but this method resulted in the edges becoming cloudy, so the spiral shape was not formed when the pipe was manufactured. Transparency is reduced even though the opaque zone is
There was a problem. We also tried bonding two transparent resin films by spirally winding them around a mandrel without attaching a transparent resin film in advance, but since the transparent resin film could not be stretched, air bubbles were generated due to uneven adhesion. It was not appropriate. However, in the present invention, since the transparent resin films 1, 1 are bonded together in a planar state in advance, tension can be applied, so that bubbles are not generated and good transparency can be ensured.

Note that the see-through tube 10 obtained as described above is cut into necessary dimensions at the point where it is removed from the mandrel 8.
This results in a container body 12 as shown in FIG. A cylindrical rigid transparent container is obtained by attaching the fish bodies 13 and 13' to the upper and lower parts of the container body 12 by caulking or attaching them to the top and bottom of the container body 12. In the present invention, as shown in FIG.
-) and clam 6 As shown in Figure 6, there is no seam step on the outer surface of the container body 12, which gives it a good appearance, and since the outer peripheral surface of the lower end of the container is straight, the lids 13, 13 can be installed in close contact with each other. This results in good sealing performance. Furthermore, since it has a multilayer structure in which two or more transparent resin films 1, 1 are laminated together, it has higher mechanical strength than those made of a single layer sheet, and there are no stepped seams on the inner surface of the sheet, so it can be used as a lining tape. can be easily reinforced, resulting in a container with high overall strength.

Next, specific examples of the present invention will be shown.

Example I. Two polyvinyl chloride films with a width of 11 Qm and a thickness of 0°2 were placed on both sides by the method shown in Figure 1.
They were laminated so as to have opposite step portions, thereby producing a multilayer transparent resin strip with a thickness of 0°4 and an effective width of 110 m. A solvent-based urethane adhesive was used as the adhesive. , the multilayer transparent resin strip showed good transparency over its entire width and was free of bubbles.

■. Next, the multilayer transparent resin band was spirally wound around a mandrel with a diameter of 78 mm, and the overlapped portions of the steps were welded. Separately, the polymerized portion was bonded with a solvent-based urethane adhesive while spirally winding it around a mandrel. Both of these rice supplies were made of 20'4 diameter φ78 mm S 1411 hard see-through W type. See-through tubes are smooth with no joint protrusions on the inner and outer surfaces, and the spiral joint has good transparency.
The welding and bonding conditions were also strong. This see-through tube was cut into 155 squares, caulked with gold stripes, and a single granular food was housed therein, but there was no leakage at all, and it showed strong resistance to compression in both the radial and axial directions.

■. I tried manufacturing see-through tubes of the same size using the conventional manufacturing method, but I could only obtain about 6 pieces. According to the method of the present invention, productivity has been significantly improved to more than 60 pieces per minute.

According to the present invention described above, in order to obtain a see-through tube for a transparent rigid container, a plurality of transparent resin films 1, 1 are laminated in advance so as to have stepped portions 3, 3 on both side edges before tube manufacturing. A transparent resin band 2 is made, this multilayer transparent resin band 2 is wound in a spiral shape so that the step portions 3, 3 are polymerized, and the polymerized step portions 3, 3 are joined, so that sufficient transparency can be achieved. It is possible to manufacture ψ see-through tubes with high mechanical strength and no seam steps on the outer and inner peripheries with high efficiency.In particular, since there are no seam steps, the appearance is good and the inner circumferential surface of the lid body An excellent effect can be obtained in that a hard transparent container with good sealability can be obtained without any gaps between the containers.

[Brief explanation of the drawing]

FIG. 1 is a perspective view illustrating the manufacturing steps of a multilayer transparent resin band in the see-through tube manufacturing method of the present invention, and FIG. 2 (α) (b)
8 is an enlarged sectional view showing an embodiment of the multilayer transparent resin band in the present invention, and FIG. 8 is a plan view showing the pipe manufacturing step in the present invention.
8a is a partial sectional view thereof, FIG. 4 is a cross sectional view of the see-through tube according to the present invention, FIGS. 5(α) and (b) are partial sectional views thereof, and FIG. 6 is a see-through tube according to the present invention. FIG. 2 is an exploded perspective view of a rigid transparent container obtained using a tube. 1.1...For transparent trees! 7 film, 2...Multilayer transparent resin '4W, 3, 3...Double section patent expert Tokyo Paper Tube Co., Ltd. Figure 4 Figure 5 (a) (b) Figure 6 Figure 145-

Claims (1)

[Claims] To obtain a see-through tube for a transparent rigid container, a multilayer transparent resin band is formed by laminating a plurality of transparent resin films so as to have stepped portions on both side edges, and is wound in a spiral shape so that the stepped portions are polymerized. A method for manufacturing a see-through tube for a rigid transparent container, which is characterized by joining polymerized step portions.