JPS6044151B2 - extruded tube - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an extruded tube in which a cylindrical tube body is constructed from a laminated material including a paper layer, and the paper layer is exposed at the sealed bottom of the tube body.

In general, in extruded tubes called laminate tubes where the tube body is made of laminated materials, if the laminated materials are made only of plastic layers, the resilience is too strong and an airbag phenomenon occurs, causing the air that flows into the tube to damage the contents. It may change the quality of things.

In addition, in order to prevent such an airbag phenomenon and prevent the dispersion of moisture, fragrance, etc. in the contents, a laminated material consisting of an aluminum foil layer and a plastic layer is generally used. Increasing the thickness of the aluminum foil layer for the purpose of giving it firmness and texture has the disadvantage of causing wrinkles and increasing costs. Therefore, in order to solve this problem, attempts have been made to use a laminated material that includes a paper layer in addition to a plastic layer and an aluminum foil layer to give the tube body appropriate stiffness and texture. For example, for an extruded toothpaste tube, the tube body is constructed using a five-layered laminated material 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 mouth plug is provided as an outlet for brushing teeth, and the other end is formed in a cut-off butt part for sealing and improving appearance. Due to this manufacturing process, the paper layer is generally exposed at the bottom, so the paper layer absorbs moisture during use, or when stored with the bottom facing down in a cup. If there is a lot of water left in this cup, the paper layer will absorb this water, which will significantly deteriorate the adhesive strength between the paper layer and the polyethylene layers on both sides, causing delamination. It was also familiar. As a means of resolving these inconveniences, adding reinforcing agents to improve paper strength or water-repellent agents to repel water is considered as a means of resolving these inconveniences, but it is important to avoid adding such additives indiscriminately. However, there were drawbacks such as the occurrence of cracks and increased costs. Also, another solution is
A resin coating is applied to the end surface of the bottom where the paper layer is exposed, a so-called bottom stop is performed in which the end surface of the bottom is covered with a separate material, or the paper layer and aluminum foil layer are bonded to each other using polyethylene on the outer or inner layer. of. Possible methods include using a sealing method such as a coating or replacing the paper layer with another material, but both of these methods impair the texture and aesthetics of the tube and reduce the number of tube manufacturing steps. Due to reasons such as increasing the number of parts and using different parts, costs are inevitably increased. This has resulted in problems such as topping up and furthermore, peeling of the resin coat and the butt stopper member. The present invention focuses on the paper layer itself, and even if the paper layer remains exposed at the sealed bottom, interlayer peeling does not easily occur when the paper layer gets wet, and it maintains appropriate restorability, thereby reducing the occurrence of wrinkles. It is an object of the present invention to provide an extruded tube that can be manufactured at low cost without impairing the texture or aesthetic appearance of the tube. Preferred embodiments of the invention will be described below with reference to the drawings.

Fig. 1 shows an example of application to an extruded tube for toothpaste, in which the tube body 1 is constructed using a laminated material 5 as shown in Fig. 2, and a spout 2 is provided at one end of the tube body 1. A cap 3 is attached to the spout 2, and the butt part 4 of the tube body 1 is sealed and cut so that the paper layer 7 is exposed.

An easy and inexpensive sealing means for the butt portion 4 is a sheet-like stack.
The layered material 5 is formed into a cylindrical shape (for example, the sheet-like laminated material 5 is rolled up and its both sides are glued together), then cut to a desired length, and the cut portions are glued using high frequency waves or the like. Therefore, the paper layer 7 is exposed on the end surface of the butt portion 4. The means for attaching the spout 2 to the cylindrical tube body 1 may be various known means, such as Japanese Patent Publication No. 39-10847.
This may be done by the means described in the publication. Various layered structures of the laminated material 5 can be considered depending on the purpose of use and the type of contents to be filled, and are not limited to the structure shown in FIG. 2.

The laminated material 5 must include at least a paper layer 7, and must have sufficient flexibility to extrude the contents 11. As an example, the layered structure of the laminated material 5 shown in FIG. is filled with. The paper layer 7 is coated with a synthetic resin at a ratio of 0.1 to 3 y/d, or is internally added at a ratio of 0.7 to 3% to the bulb forming the paper layer 7.

It is a well-known technique to use sizing agents such as pine resin, glue, and starch to increase the sizing of the paper in the paper layer 7, and it is also known to add various reinforcing agents to increase paper strength. However, adding a large amount of sizing agent or reinforcing agent to the paper layer 7 of the extruded tube improves the sizing and paper orientation of the paper itself, but has the disadvantage of causing cracks and increased costs. For example, it has been found that the addition of urea resin hardens the paper and impairs its texture, while dialdehyde starch has poor water resistance and water repellency and is therefore not suitable for the paper layer 7 of extruded tubes. Further, if the amount of these additives is less than 0.5%, no effect can be obtained, and if the amount is more than 1.5%, the paper becomes hard, causing problems such as cracking and loss of texture. Therefore, the suitability of the paper layer 7 as an element of the laminated material 5 constituting the tube body 1 of the extruded tube must be investigated. As a result, it was found that the optimal synthetic resin to be coated or internally added to the paper layer 7 is a coating of 0.1 to 3 y/d using a size press, or an internal addition of 0.7 to 3% relative to the valve. I found out. Furthermore, as the synthetic resin used, good results were obtained using melamine resin, acrylic resin, and epoxy resin. These resins were added at 0.5% to 1.5% and 0.
．． Paper layer 7 at a rate of 2-0.5%, 0.03-0.08%
When added internally, deterioration of the extruded tube due to water absorption by the paper layer 7 was prevented, no cracks were observed, and the feel of the tube was not impaired. The internal addition of 0.5 to 1.5% of the melamine resin gives the paper layer 7 tensile strength when wet, and can be obtained at low cost. In addition, the above 0.2 to 0
．． The internal addition of 5% acrylic resin gives the paper layer 7 interlayer peel strength when wet, and is 0.03 to 0.08%.
Epoxy resins are used to fix melamine resins and acrylic resins. Note that the paper layer 7 may be coated or internally added with a water repellent such as polyethylene resin, wax, or silicone to impart water repellency. The water repellent is preferably applied in an amount of 0.2 to 2.5 y/y on the paper surface. In the invention described above, no special wood bulbs are used to form the paper layer 7, but by varying the blending ratio of softwood bulbs and hardwood bulbs in the wood bulbs, It has been found that the paper layer 7 as one element of the laminated material 5 constituting the tube body 1 exhibits optimal properties at a certain mixing ratio. That is, the blending ratio of softwood bulbs and hardwood bulbs in the wood bulb forming the paper layer 7 is adjusted to 7:3 to 10:0, and a predetermined amount of synthetic resin is coated or coated as in the first invention described above. It has been found that in the second invention, the intended purpose of the layer can be achieved. The present inventor varied the blending ratio of softwood bulbs and hardwood bulbs and observed the paper strength of the paper layer 7 at each ratio. As a result, when the hardwood bulb content exceeds 30%, the entanglement of the bulbs becomes weaker and the paper strength It was discovered that the absolute strength of Therefore, it has been found that a ratio of 7:3 to 10:0 of softwood bulb and hardwood bulb is good in terms of tensile and tear strength. This is a softwood valve,
For example, pine and fir bulbs have longer fibers and are more flexible than hardwood bulbs, so the fibers become more entangled. In addition, the entanglement of the valve itself increases,
In order to increase the joint strength between valves, the valve beating degree should be increased to 3.
Good results can be obtained by setting the voltage to 00 to 500cc/3V, and less than 300cc/3y or 500cc/3
When it exceeded g, the required strength could not be obtained. The base paper of the paper layer 7 in this second invention has a basis weight of 20 to 60y.
/d1 wet tensile strength longitudinal 2k9 or more, interlayer peel strength 100
When the water repellent was coated with a water repellent agent at a rate of 0.2 to 2.5 q/d, the water repellency was 4 or more, and the intended purpose could be fully achieved. The following table shows base papers with various valve compounding ratios and melamine resin (
stomach). 5 to 1.55%), acrylic resin (a). 2-0
．． 5%), epoxy resin (4). 03-0.08%),
Water repellent (a). 2 to 2.5q/771') of synthetic resin is internally added, coated, or not internally added (coated) to a combination of various base papers. Note that the interlayer peel strength is the peel strength between the paper layer 7 and the polyethylene layers 6 and 8 bonded to both sides. As is clear from the above table, it is better to form a paper layer using a base paper coated or internally added with a synthetic resin to prevent delamination during wet conditions. When the paper layer is formed using a base paper having a blending ratio of 7:3 to 10:0, it is even more effective in preventing delamination. Further, according to the present invention, since the laminated material includes a paper layer having sufficient tear strength, an appropriate degree of restorability is maintained and the product does not wrinkle and reduce its commercial value. Furthermore, the paper layer can be exposed by simply sealing and cutting the bottom of the tube body, so there is no reduction in manufacturing efficiency, and the processing of the paper layer is also economical, making it inexpensive overall. can be manufactured.

[Brief explanation of the drawing]

FIG. 1 is a perspective view, and FIG. 2 is a partial sectional view of the laminated material. DESCRIPTION OF SYMBOLS 1... Tube body, 4... Butt part, 5... Laminated material, 7... Paper layer.

Claims (1)

[Scope of Claims] 1. In an extruded tube in which a cylindrical tube body is constructed from a laminated material including a paper layer, and the paper layer is exposed at the sealed bottom of the tube body, the paper layer is coated with zero synthetic resin.
．． An extruded tube characterized in that 0.7 to 3% of pulp is added to the pulp forming a coating or paper layer at a rate of 1 to 3 g/m^2. 2. Claim 1, characterized in that the synthetic resin coated or internally added to the paper layer is one or a combination of two or more of melamine resin, acrylic resin, and epoxy resin. Extruded tube as described. 3. The internal addition amounts of the melamine resin, acrylic resin, and epoxy resin are 0.5 to 1.5%, 0.2 to 0.5%, and 0.03 to 0.0%, respectively, relative to the pipe forming the paper layer.
2. The extruded tube according to claim 2, wherein the extruded tube has a content of 0.08%. 4. The extruded tube according to any one of claims 1 to 3, wherein the paper layer is coated with or internally added with a water repellent such as wax, silicone, or polyethylene resin. 5 In an extruded tube in which a cylindrical tube body is constructed from a laminated material including a paper layer, and the paper layer is exposed at the sealed bottom of the tube body, the paper layer is coated with zero synthetic resin.
．． 1 to 3 g/m^2 0.7 to 3% is added internally to the pulp forming the coating or paper layer, and the blending ratio of softwood pulp and hardwood pulp in the wood pulp forming the paper layer is 7:3. An extruded tube characterized in that the ratio is adjusted to 10:0. 6 The pulp beating degree of the wood pulp forming the paper layer is 3.
The extruded tube according to claim 5, characterized in that the extruded tube has a weight of 00 to 500 cc/3 g.