JPS61220840A - Extruded tube - 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 (Industrial Field of Application) The present invention relates to an extruded tube whose body is formed from a raw material laminated with various different materials. More specifically, the present invention relates to a novel extruded tube whose body is constructed from a laminated material including a paper layer, the paper layer being made of neutral paper.

(Prior Art) To explain extruded tubes with reference to Fig. 2, extruded tubes, which are generally called laminate tubes whose extruded tube body is made of laminated materials, are made of olefin resin such as polyethylene, aluminum foil or PVA
Laminate 5 to 10 layers of barrier resin, paper, etc., such as PvDC type, N4N type, KVA type, KVAL type, etc., make Kuepu into a cylinder shape, seal the sides 12, and make the body. 11, and attach the shoulder part 13 having a spout at one end of the body by attaching the cap 14 and sealing the other end after filling with the contents, and cutting as necessary to improve the appearance. It is performed to form the butt part 15 with a curved shape. Currently, various types of laminated tubes on the market are used as containers for toothpaste paste, etc., so in order to prevent the contents from deteriorating and dissipating moisture and fragrance, etc. Properties such as protection and preservation are required. In addition, from the viewpoint of practicality of extruded tubes, properties such as flexibility, drawability, and appropriate restorability are required. Various improvements have been attempted in consideration of these characteristics. For example, for an extruded toothpaste tube, the tube body is constructed using a laminate material with a five-layer structure consisting of a polyethylene layer, a paper layer, a polyethylene layer, an aluminum foil layer, and a polyethylene layer from the outside, and one end of the tube body is It is known that a toothpaste base has a shoulder part with a spout and the other end is self-formed (Japanese Patent Publication No. 39-10847).
No., Special Publication No. 52-4527! No. I, Utsuko Sho 59-402
No. 06). These extruded tubes generally have a paper layer exposed at the bottom due to the manufacturing process described above.
When using the extruded tube, the paper layer may become damp or come into contact with toothpaste, causing deterioration of the paper layer, which can significantly reduce the adhesive strength between the paper waste and other laminated materials. This caused peeling. This kind of paper layer exposure of the buttocks K
In addition to the problems involved, when forming laminated materials into cylinders, the tube body is provided with a seam called a side seam in the longitudinal direction, and the joint between the tube body and the shoulder part is is provided structurally. In the harsh operating environment of extruded tubes, if there is a localized unstable seal in the deformed seal, contact between moisture or the contents and the paper layer (Kf) may cause the paper layer to break, resulting in penetration of the toothpaste paste and damage to the paper layer. This may lead to a decrease in the strength of the joint, which may lead to breakage of the extruded tube or poor appearance. Furthermore, regarding the paper layer, in addition to water resistance and content resistance,
When molding the original material, which is a paper laminated material, into a cylindrical shape,
Heat sealing processing (heat sealing method, high frequency sealing method, ultrasonic sealing method, etc.) is performed, but at this time, thermal deterioration occurs due to heat load at the sealing part, and in extreme cases, the paper layer becomes yellowed. The problem is that scorching occurs, which not only narrows the sealing conditions, but also makes it impossible to obtain sufficient quality in terms of the strength and appearance of the sealed portion. Further, since paper waste is present, there is also the problem of paper dust and paris being generated during the slitting of the laminated material during the molding process and the trunching for finishing the end surface.

As a means of resolving this problem, it has been proposed to add reinforcing agents to increase paper strength and water-repellent agents to repel water, but it is important to avoid adding such additives indiscriminately. However, there were problems such as the occurrence of cracks and increased costs. On the other hand, it has also been proposed to eliminate the above-mentioned disadvantages in paper selection. For example, Special Publication No. 59-10847 uses cellophane.

Paper was published in Japanese Patent Publication No. 52-45275 (U.S. Patent No. 3347).
419 (corresponding to the specification), glassine paper with wet strength is used, while papers such as glassine paper, kraft paper, imitation paper, or synthetic paper are used in Utility Model Publication Nos. 54-22769 and 54-22770. Publication No. 57-59523 contains sulfuric acid, IIE (
parchment paper), but in Utility Model Publication No. 58-50675,
Kraft paper, high-quality paper, parchment paper, glassine paper, map paper, etc. were published in 1983. No. 55857 includes paper with internal additions of Melano resin, acrylic resin, and epoxy resin, and the pulp constituting the paper waste was published in 1986-40.
No. 206 contains softwood pulp (N) and hardwood pulp (L).
The mixing ratio of 7:3 to 10:O was established in
No. 8-30675 states that natural pulp and synthetic resin pulp are blended, and Utility Model Application Publication No. 179037/1986 states that 90-60% natural pulp is blended with 10-40% polyethylene pulp.
It is indicated that the amount is by weight.

(Problems to be Solved by the Invention) However, it is still difficult to say that the paper is sufficient as a laminated material for extrusion tapes.
The present inventors have investigated, from the viewpoints of the type of sizing agent in the paper used as a laminate material for extruded tubes, as well as acidic paper and neutral paper, ・Water resistance,
We conducted extensive research on the characteristics of heat resistance, penetration resistance, folding durability, glabella peel strength, strength deterioration during heat sealing and high frequency sealing, yellowing of paper waste, and wet strength.

As a result, as a base paper for extruded tubes with at least one side coated with thermoplastic resin, such as polyolefin resin,
It was found that the following conditions must be met.

That is, (1) It has a sufficient penetration prevention effect against contents containing surfactants (for example, toothpaste paste, etc.).

(2) In order to improve the adhesion when extrusion laminating polyolefin resin such as polyethylene onto base paper, polyethylene imine is usually applied to base paper.
Use a sizing agent that does not reduce sizing.

(3) When cutting the laminated material into a predetermined width, the shearing property must be good and no paper dust or burrs will be generated.

(4) Laminated materials using this base paper are required, such as good productivity because the paper layer does not deteriorate or yellow due to the heat generated when sealing the body side seams and tail of the extruded tube. The extruded tube made of
It must also be satisfactory in terms of flexibility, drawability, etc.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention uses neutral paper for the paper layer of an extruded tube that constitutes the body from a laminated material including a paper layer. The most important feature is the use of neutral paper made by supporting an alkyl ketene dimer-based sizing agent.

The present invention will be explained in detail below.

Regarding the structure of the extruded laminated material for tapes of the present invention, for example, as shown in FIG. A certain resin 3 (for example, polyethylene when the outer image protection layer is made of polyethylene) is laminated, and on the other hand,
A base paper 5 is laminated on the other side of the metal foil via an adhesive polyolefin resin 4, and a milky white polyethylene 7 is further laminated as a base layer on the base paper 5 via an adhesive polyolefin resin 6, and the base layer 7 It is a laminated material having a structure in which a layer of resin (for example, polyethylene) having compatibilism or adhesiveness with an inner layer resin below the metal foil is provided as a protective film layer 8 on top of the metal foil.

Aluminum foil is used as the metal foil, and its thickness is 7 to 4
A value around 0p is appropriate. The base paper mentioned above is used to maintain the texture, swelling, etc. of the tape body made of laminated material, and the base paper thickness is usually 20 to 64 f/m, although this also depends on the thickness of the aluminum foil. ” can be selected.

The pulp used for the base paper of the present invention is appropriately selected from chemical pulps such as soda-cooked pulp of softwood and hardwood, kraft-cooked pulp, alkaline sulfite-process pulp, neutral or acidic sulfite-process pulp, etc., as wood pulp. Although the choice is possible, the preferred pulp is Kraft-cooked pulp. Further, synthetic fiber-based pulps such as polyolefin-based synthetic pulps, Lein pulps, and acrylic fiber-based pulps can be used in combination with wood pulp.

The blending ratio of softwood pulp (N material) and hardwood pulp (L material) is in the range of 1010 to V5, preferably 1
Rashi in the range of 070 to 6/4, its freeness is 1
50 to 5500C, preferably 250 to 4000H.

Sizing agents used in the present invention include alkyl ketene dimer-based sizing agents having a lactone ring, alkenylsuccinic anhydride-based sizing agents having an acid anhydride ring, other incyanatoaziridine derivatives, carbonyl derivatives, rosin anhydride, Reactive sizing agents that directly react with cellulose fibers such as fatty acid anhydrides (Japanese Patent Publication No. 46-27766, Japanese Patent Publication No. 46-10484, Japanese Patent Publication No. 47-57165,
JP-A-5O-94204, JP-A-51-41845, JP-A-52-3006, JP-A-59-902),
Alternatively, a cationic sizing agent having self-fixing properties (Japanese Patent Publication No. 45-55565, Japanese Patent Application Laid-open No. 116705-1980,
゛Japanese Patent Publication No. 11407/1973, 1229/1973
No. 2) are used, preferred are reactive sizing agents.

Alkyl ketene dimer sizing agents are v, s, and p.

2.62s No. 477, U, 8. P, λ742,270 or Tappi Vol 39. m 1 (1956
) disclosed on pages 21 to 2B, and the alkyl group has 8 to 50 carbon atoms. Preferably 12 to 16 are suitable.

As an alkenylsuccinic anhydride-based sizing agent,
Preferred are those disclosed in JP-A No. 9-2505 (U, 8.P, %12,044), JP-A-49-94907, JP-A-50-160505, and the like.

These neutral paper sizing agents are added in an amount of α1 to 55% by weight, preferably α2 to 50% by weight, based on the pulp. Cationic starch is suitable as a fixing agent for the sizing agent. Further, the neutral paper of the present invention may contain calcium carbonate as a filler, and the content is 10% by weight per pulp.
Below, preferably 511 views or less.

A polyacrylamide resin is used as a filler retention improver. In addition to the above, paper strength enhancers, dyes, etc. used in general paper manufacturing processes may be used as appropriate.

The base paper described above is silaminated with other different materials by appropriate means as described below.

Adhesive polyolefin resin such as polyethylene or a copolymer of ethylene and unsaturated carboxylic acid is used as the intervening resin between the laminated layers such as base paper and aluminum foil, aluminum foil and innermost layer resin, and milky white polyethylene and base paper. as 20
It can be arbitrarily selected from the range of ~90μ. As a laminating method for these laminated materials, known processing techniques such as an extrusion lamination method and a film lamination (dry lamination) method are used.

The thus produced laminated material is slit and trimmed to a predetermined fabric width to finish the end face.9 The raw fabric for extruded tubes is formed into a cylindrical shape, and the joints are sealed using, for example, a high frequency sealing method to form a tube body. After that, the shoulder parts are attached by high-frequency sealing the shoulder parts combined with the pre-formed molded product containing the aluminum layer, or by welding the shoulder parts to the tube body when molding the shoulder parts. is removed, and then the cap is attached to complete the tube body. Next, toothpaste paste is filled from the tail of the completed tube body, and after the tail is sealed by known means, it is cut as necessary to complete the extruded toothpaste tube.

EXAMPLES Hereinafter, examples will be shown in order to make the present invention easier to understand, but the following examples are not intended to limit the present invention in any way.

〔Example〕

After mixing softwood bleached kraft pulp (NBKP) and hardwood bleached kraft pulp (LBICP) beaten to Canadian freeness 340ω in a ratio of 65:35, the following chemicals were added to the Isa pulp in the ratios shown below. A paper sheet with a basis weight of 440 f/m was obtained by the normal papermaking method under stock inlet OpH & 50 conditions (Experiment 1), (8PK902 made by Aurayo Kasei) [15% wet paper strength agent; epoxy system Resin size fixing agent: 115% cationic starch (K made from egg cornstarch F) and polyethyleneimine for surface size α04 f/m”
The base paper B (Experiment Ugly 2) was obtained (all neutral paper).

Next, under the above-mentioned freeness conditions and pulp composition, the following chemicals were added to the pulp in the proportions shown below, and the basis weight was 6 L using the normal papermaking method under the conditions of stock inlet pH 45.
Of 7 m'' base paper C (experiment ILj) was obtained.

Sizing agent: Synthetic petroleum size Size fixing agent: Aluminum sulfate (sulfuric acid band manufactured by Honshu Chemical Co., Ltd.) 1.4 inches Wet paper strength agent: Melamine resin Dry paper strength enhancer Niacrylamide resin Furthermore, polyethyleneimine is used as a surface sizing agent (L O
4f 7m" was applied to obtain a base paper (experimental section 4) (acidic paper).

Table 1 shows the results of measuring the paper quality and paper strength of these base papers A to D after heat treatment.

According to Table 1, acidic paper (base paper c, n) shows a decrease in strength as it ages, but neutral paper (base paper A, B)) Experimental results show that the strength lasts. Regarding the sizing degree when polyethyleneimine is coated, there is a noticeable decrease in acidic paper compared to uncoated paper, but on the contrary, a slight improvement in sizing degree is observed in neutral paper.

In addition, using the above base paper, a laminate for extruded tubes of polyethylene/adhesive polyolefin resin/aluminum foil/adhesive polyolefin resin/base paper/adhesive polyolefin/milky white polyethylene/polyethylene is manufactured from the inside,
Table 2 is a table comparing the end face permeability and wet interlaminar strength of this laminate.

The sample was prepared using a laminated material as a blank for dipping, and the specified dimensions (4
0x75■) and use it to make two types of commercially available toothpaste pastes with excellent permeability? The material was immersed for 4 hours and the permeability from the blank edge portion was evaluated based on the area ratio of the permeation trace.

In addition, the wet interlaminar strength test was performed by cutting the corresponding laminated material into a blank of specified size (4SW x 40-) as a blank for immersion, immersing it in water at a water level of 30- for 94 hours, and cutting a 45-mg center part 15- for measurement. The laminated material was peeled from the paper layer part using a tensile tester at a tensile speed of 100 cm/-, and the glabellar peel strength of the wet edge part was measured using the T-peel method.

From this result, compared to the conventional extruded laminate for tubes containing acidic paper, the laminate containing neutral paper had 5 to 5 times the permeation resistance at the end surface.

In addition, regarding the glabellar peel strength, the strength of the known extruded laminated material for tubes (Utility Model Publication No. 59-40204) was 3S.
~ast/1s-, a marked superiority was obtained, and in the above experiment, an equivalent or higher strength was obtained.

Furthermore, using the laminated material, a blank in which the bodies of the tube bodies were stacked so as to have a predetermined tube diameter was molded into a cylindrical shape by sealing the sides of the body by a high-frequency sealing method. In this case, in the case of laminated materials containing acidic paper, the appearance of the sealed portion (including the wide portion) and the deterioration of the paper (i.e., yellowing) may cause a decrease in seam tensile strength, folding strength, seam strength, etc. The energy range was previously restricted to an extremely narrow range, but by using neutral paper for the paper layer of the laminated material, yellowing resistance was improved and the range of high-frequency output energy conditions was expanded by about 10 inches. When the energy level is the same, high-output, short-time sealing is possible, improving production efficiency, and shortening the sealing time, resulting in appropriate thermal deformability of the seal resin. This also leads to improvement in the external appearance of the parts.

To manufacture a laminated material using base paper as a paper layer having the above properties, a 50μ thick polyethylene resin is laminated on one side of a 15μ thick aluminum foil via an adhesive polyolefin resin, and an adhesive polyethylene resin is laminated on the other side. Basis weight 64 through polyolefin resin
t/ga base paper is laminated, and 40p is applied as a base layer to the base paper.
A thick milky white polyethylene was laminated with an adhesive polyolefin resin interposed therebetween, and a 50μ thick polyethylene was provided on the base layer to obtain a laminated material with a total thickness of 315P. Each lamination method was performed by extrusion lamination.

The thus produced laminated material was slit and trimmed to a predetermined tube size, and the end surfaces were finished.The raw material was then side-seamed using a high frequency sealing method to form a cylindrical tube body. Thereafter, the shoulder parts including the aluminum layer were subjected to high-frequency sealing, and a cap was attached to complete the extruded tube body. After filling the tube with toothpaste paste from the butt, the wide part was sealed using high-frequency waves, and the wide part was cut for trimming to complete the extruded tube containing the paste.

　　　　.

(Effects) As is clear from the above explanation, according to the extruded tube of the present invention, the paper layer included in the body is made of neutral paper and has excellent content permeation resistance and folding durability. Even if the exposed paper layer comes into contact with water or toothpaste paste, it is difficult to penetrate, preventing delamination, and can withstand repeated use of extruded tubes, maintaining a suitable degree of resilience. It has high practical value as it prevents wrinkles and maintains its texture. In addition, since a manufacturing process in which the paper layer is exposed in the wide area can be adopted, there is no need for extra steps such as attaching a butt top member or applying resin, and the product can be manufactured at low cost without lowering manufacturing efficiency. Furthermore, since the paper layer of the present invention has excellent heat resistance, it is possible to prevent the yellowing phenomenon that is easily caused by heat treatment during the manufacturing process, such as the side seam of the tube body, the joint with the shoulder parts, the sealing of the wide area, etc. , the strength of each joint can be maintained equal to that of other laminated parts, and deterioration of the paper layer can be sufficiently prevented.

In addition, the present invention, which uses neutral paper, generates less paper dust and debris when slitting laminated materials to a predetermined width or trimming rounded edges, contributing to improved environmental hygiene. At the same time, it is effective in maintaining the quality of the side seam of the tube body in the extrusion tube forming process, the welding between the tube body and shoulder parts, and the adhesive quality of the butt seal.As a result, the overall strength and appearance of the extruded tube are improved. This contributes to improvement.

[Brief explanation of the drawing]

FIG. 1 is a partial sectional view of the original tube body, and FIG. 2 is a perspective view of the extruded tube.

Claims (1)

[Scope of Claims] 1. An extruded tube whose body is constructed from a laminated material including a paper layer, characterized in that the paper layer is made of neutral paper. 2. The extrusion tube according to claim 1, wherein the neutral paper has an alkyl ketene dimer-based sizing agent added thereto as a sizing agent.