JPH08324600A - Laminate tube - Google Patents

Abstract

PURPOSE: To provide a laminate tube which can be produced with a wide freedom in the laminate constitution, adapting to a variety of material to be contained, suitable to the extrusion, having a good air, and almost seamless appearance as a tube. CONSTITUTION: A laminate tube, the surface layer of which differs in quality from the rear layer is formed by putting together the two end edges of a strips of laminate, placed parallel to the direction of its run, and joining them to form a tube by heat seal. The trunk part 20 is formed by applying a tape 4 along both end edges from inside. Each of both end edges is formed either in a slantingly cut plane 2 or in steps 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an extruded tube container having an excellent protection function for contents widely used in foods, pharmaceuticals, cosmetics, special industrial products and the like.

[0002]

2. Description of the Related Art A laminated tube, which has been widely used mainly for toothpaste, has a body formed of a laminated material. Further, in the molding of the body portion, both end edges in the longitudinal direction of the strip-shaped laminated material are joined by encapsulation as shown in FIG. That is, as shown in FIG. 8A, the front surface and the back surface of the laminated material are overlapped and then bonded by thermocompression bonding. This joining is generally called tube sticking, and the tube sticking part 1 is shown in FIG.
As shown in (b), the low melting point polyolefin resin A
Melt and are integrated and joined, and a part flows out to protect the end surface of the laminated material. Since the high melting point resin, aluminum foil, paper, etc. B, C --- are trying to maintain the original shape, the tube attachment part 1 is thicker than the other parts.

[0003]

When the application of the laminated tube is expanded to foods, pharmaceuticals, cosmetics, special industrial products, etc., it is said that at least the innermost surface is the polyolefin resin used for the inner and outer surfaces of the conventional laminated tube. Differently, it has excellent protection function for aroma components and pharmaceutical ingredients,
In addition, it is necessary to use a resin with heat sealability. However, in the conventional body forming method by sticking envelopes where the body cannot be formed unless it is made of the same material as the front and back, the resin with the special function as mentioned above is used for both the front and back, so it is over-spec in terms of protection function. Therefore, there are problems that it will affect the economic cost, impair the proper diaphragming, and the texture, that is, the feel when holding it by hand.
The present invention has been made in view of the above problems, and an object of the present invention is to provide a laminate tube capable of processing a body even with a laminated material having different front and back materials.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and a strip-shaped laminated material having different front and back materials is made into a cylindrical shape by abutting the ends of each other in the flow direction and heat-sealing such as heat-sealing. Joined to form a body, to reduce the step on the surface of the body, to provide a diagonally cut surface on each of the both end edges, or to provide a step, and to cut each end edge diagonally. The side edges of the strip-shaped laminated material are overlapped with each other, or the side edge and the step surface of the strip-shaped laminated material having a step on one of both end edges are overlapped to form a tubular shape by heat welding such as heat sealing. A gist of a laminated tube is characterized in that it is joined to form a body portion, a step on the surface of the body portion is reduced, and a tape is internally stuck along the joint portion of the body portion.

[0005]

According to the laminated tube of the present invention, the body portion can be formed even if the front and back surfaces of the laminated material are different materials, and the variations in the laminated structure are abundant. In addition, the appearance of the joints becomes cleaner, and a tube similar to a seamless tube can be obtained.

[0006]

The present invention will be described in more detail with reference to the drawings. Polyolefin resin is used for the inner and outer layers of the body of a conventional laminated tube. However, for example, if a polyacrylonitrile copolymer (PAN), which is excellent in protection suitability for special medicinal and aroma components, is used only on the inner surface of the laminate tube, it is necessary to provide a PAN layer on the outer surface in the conventional body molding method. there were. PAN is more expensive than a polyolefin resin, and if it is used on both sides, it not only raises the cost, but also gives the body more rigidity than necessary, making it difficult to extrude the contents and making it uncomfortable to touch. Therefore, such a problem will be solved if the laminated material of different materials on the front and back sides can be stuck on the tube, and the laminated tube according to the present invention using the laminated material of different materials on the front and back will be described below.

The tube sticking portion 1 of the laminated tube according to the present invention is formed by two kinds of means. First, according to the first means, as shown in FIG. 1A, both end faces are obliquely cut, and the diagonal end faces 2 are butted to each other and joined by heat sealing. The second means is shown in FIG.
As shown in (b), the end faces are stepped, and the end faces 3 having different steps are abutted against each other so as to have the same thickness and joined by heat sealing.

FIG. 2 is an explanatory view of the butt joint by the first means. As shown in FIG. 2A, a laminated material 10 made of laminated materials different in A to E is joined by heat-sealing the end faces 2 cut obliquely, and in this case, the same quality of the same layer is obtained. Since the raw materials are butted against each other at the end face 2 and joined by heat sealing, there is no need to use the same resin material for the inner and outer layers as in the conventional laminated tube.
The layer structure of the intermediate layer also has a considerable degree of freedom in the arrangement order. Therefore, the optimum laminated structure according to the contents can be relatively freely determined in consideration of the protection function, the laminating process, etc., and the laminated tube using necessary and sufficient laminated materials can be provided at an economical cost. Like As a result, the application range of the laminated tube according to the present invention is expanded. The state in which the diagonally cut end faces are first butted against each other may have a uniform thickness from the beginning as shown in FIG. 2 (b). You may make it shift a phase like c) and (d). Strictly speaking, in the case shown in FIG. 2D, superposition is more appropriate than butt matching, and the method corresponds to claim 4. In any case, when joining the edges, pressure is applied from the inner and outer surfaces in addition to heating by some method, but in the case of superposition, pressure is particularly required.

In the first means in which the slanted end faces 2 are butted against each other and joined by heat sealing, a reinforcing tape 4 made of polyethylene terephthalate film or the like is further adhered inside along the end faces as shown in FIGS. 1 and 2. You may make it reinforced. This is because, depending on the laminated structure, the adhesive strength is insufficient in heat sealing with only the oblique end face, and the permeation of the contents from the end face into the laminated material is prevented. Further, it also has the effect of compensating for the loss of thickness due to heating and pressure bonding of the cylinder attachment part 1.

The method of providing the slanted end faces 2 on both ends of the laminated material piece is carried out by using a well-known leather cutter as shown in FIG. 3 (a) or a circular cutter as shown in FIG. 3 (b). This diagonal cut is printed and laminated in the state of the wide original fabric of the conventional laminated tube, and finally the slitter blade when slitting with the product width corresponding to the circumference of the tube is replaced with the one shown in Fig. 3. Alternatively, the strip-shaped laminated material whose both end faces are slit at right angles by a conventional cutter is once wound, and the strip-shaped laminated material is supplied from this winding to the tube laminating machine, and the tube laminating machine is shown in FIG. As shown, both end faces may be cut obliquely. In addition,
As shown in FIG. 4, the reinforcing tape 4 is inserted into the inner surface of the laminate tube 20 immediately before the tube attaching unit 8. The above diagonal cut has a thickness of a normal laminated material of 10
In the case of a laminated tube having a thickness of 0 to 500 μm, it is desirable that the thickness be 1 to 2 mm in the circumferential direction of the laminated material.

Next, the second means will be described. As shown in FIG. 5, the stepped end faces 3 at both ends in the longitudinal direction of the laminated material piece
Is composed of a plurality of steps, and the shape of the step is as shown in FIG. 5 as long as the steps on both end faces complement each other in thickness.
Even if the point symmetry as shown in FIGS.
It may be asymmetric as shown in (c). However, in any case, it is necessary to determine which layered material should be provided with the stepped horizontal surface in consideration of the layer thickness, the layering process and the like. Further, as shown in FIG. 5 (d), in a strip-shaped laminated material having a step on one of both end edges, a side portion and a step surface are joined together in a tubular shape by heat welding such as heat sealing to form a body portion. May be. This corresponds to claim 4 and requires a higher pressure than the butt method in order to reduce the step difference in the overlapping portion. In the second means, it is more important to join the laminated materials opposed to each other on the horizontal plane of the step rather than the vertical surfaces of the abutted laminated materials of the same kind, and to have compatibility with the horizontal plane of the stepped end face 3 and to have heat sealability. It is necessary to design the laminated structure so that the resin layers having a certain thickness face each other. Second
Also in the means, it is preferable to use the tape 4 for reinforcement similarly to the first means.

The body portion 20 of the laminated tube by butting and joining the stepped end faces 3 of the second means is manufactured by the following method. First, each strip-shaped laminated material piece A, B, C slit into a width corresponding to the circumference of one tube
− Is laminated by shifting the step width of the step in the flow direction and the cross direction so that a step is formed,
6 is formed on both sides, and then the strip-shaped laminated material is supplied to the tube applying machine as shown in FIG.
After thermocompression bonding (not shown) and tube bonding, the body portion 20 is cut into a predetermined length. Alternatively, as shown in FIG. 6B, the laminated material pieces cut into a predetermined size may be wound around the core one by one, and the abutted stepped end faces 3 may be heat-sealed.

Further, when the efficiency of the stepped end surface processing method is insufficient and causes a problem, a multi-row step processing method described below may be used. That is, as shown in FIG. 7, for example, when laminating and printing are performed in four rows, a striped release layer is formed on the material raw material forming the step surface of the stepped end surface 3 as shown in FIG. The pattern 5 is partially coated and formed. In this figure, the laminated pieces per laminated tube are indicated by L × R. A cross section aa 'in the cross direction with respect to the peeling layer pattern 5 is shown in FIG. After laminating the raw material sheet obtained by further stacking the raw material sheet, from the opposite sides along the lines 7 and 7'at both ends of the release layer pattern 5, as shown in FIG. The strip line pattern 5 is slit at the center line 6 to form a strip-shaped laminated web having a width R, and the diagonally shaded portions shown in FIG. 7 (b) are stripped from both ends thereof as shown in FIG. 7 (c). Step up and roll up. Finally, using the wound strip-shaped laminated material, a tube is attached by the above-described method shown in FIG. 6 (a) or (b).

As a printing method for a wide web, in addition to well-known methods such as gravure printing, offset printing and silk screen printing, foil stamping, embossing and the like can be sufficiently performed.
Furthermore, an arbitrary transparent pattern, a so-called window, can be provided at any place on the body. By the above-described processing of the body portion 20 of the laminated tube, the tube-attached portion, which has been an eyesore so far, becomes beautiful to the extent that it cannot be visually identified,
It has become possible to supply laminated tubes that give the product a high-class feel and can be designed with a high degree of perfection. It should be noted that the advantages of the conventional laminate tube, such as the efficiency of preprinting and the reverse printing on the transparent laminate material, which the present invention has, are not impaired.

As described above, the laminated tube according to the present invention has a greater degree of freedom in the laminated structure than the conventional laminated tube, and can be processed with the same or different front and back materials. Therefore, the applicable range of the contents can be expanded. It For example, the following laminated tubes of different materials can be supplied. PEF150 / PE30 / EVOH15 / PE30 / milk white PEF120 PE210 / PET12 / SiOx-PET12 / PA
N70 PEF150 / PET12 / PE20 / Milk White PEF12
0 / SiOx-PET12 / EVOH60 PEF150 / PET12 / PE20 / milk white PEF12
0 / SiOx-PET12 / PAN70 PE polyethylene PEF polyethylene film PET polyethylene terephthalate EVOH ethylene vinyl alcohol copolymer PAN polyacrylonitrile copolymer SiOx silicon oxide vapor deposition film

[0016]

According to the laminate tube of the present invention, by using different materials for the front and back surfaces of the laminated material, the degree of freedom in the combination of laminated materials and the order of lamination can be increased, and more contents can be accommodated. By combining necessary and sufficient materials, the material cost can be reduced, and the extrusion suitability, the feel at the time of extrusion, the texture, etc. can be freely controlled. Furthermore, the surface condition of the tube-applied portion approaches that of the seamless tube, which enables a high-quality decoration.

[Brief description of drawings]

FIG. 1 is a sectional view of a body portion of a laminated tube according to the present invention.

FIG. 2 is an explanatory view of the joining mainly for the abutting of the diagonally cut end faces of the first means.

FIG. 3 is an explanatory view of a cutter for oblique cutting

FIG. 4 is an explanatory view of a method for processing a diagonally cut end surface.

FIG. 5 is an explanatory view of the joining mainly for the abutting of the stepped end faces of the second means.

FIG. 6 is an explanatory diagram of processing of end faces having different steps and sticking to a cylinder.

FIG. 7 is an explanatory view of processing end-faces in different rows in multiple rows.

FIG. 8 is an explanatory diagram of a conventional laminated tube attached to a tube.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Cylinder sticking part 2 Diagonal cut end surface 3 Step difference end surface 4 Reinforcing tape 5 Release layer 6 Slit line 7 Half cut line 7'Half cut line 8 Sealer 10 Body part of laminated tube according to the present invention 20 Body of laminated tube according to the present invention Part AE Laminated material

Claims (5)

[Claims] 1. A strip-shaped laminated material having different front and back materials, the ends of which are opposed to each other in the flow direction are butted against each other and joined in a tubular shape by heat welding such as heat sealing to form a body portion, and a step on the surface of the body portion is reduced. Laminated tube characterized by doing. 2. The laminated tube according to claim 1, wherein a diagonally cut surface is provided on each of the both end edges. 3. The laminated tube according to claim 1, wherein a step is provided on each of the both edges. 4. The side edges of the strip-shaped laminated material whose both edges are cut obliquely are overlapped with each other, or the side edges and the step surface of the strip-shaped laminated material having a step on one of the both edges are overlapped. A laminated tube, characterized in that the combined product is joined to form a barrel by heat welding such as heat sealing to form a barrel, and steps on the surface of the barrel are reduced. 5. The laminated tube according to claim 1, wherein a tape is attached inside the joint portion of the body portion.