JPS5934483B2 - Synthetic resin tube container with a ridge pattern on the outer circumferential surface of the body and method for forming the ridge pattern - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a synthetic resin tube container in which a desired ridge pattern is formed on the outer peripheral surface of the body, and a method for forming the ridge pattern. By forming a protrusion pattern only on the outer peripheral surface of the body while keeping the peripheral surface in a smooth state during molding of the body, the appearance of the container can be varied and at the same time the container can be used in a good condition. In addition, by limiting the forming target to only the outer peripheral surface of the body, the forming operation of the protrusion pattern and its heating control can be performed accurately and easily, and the body, which is the main body of the container, can be formed with ease. The purpose of this is to form a good protrusion pattern without any mechanical adverse effect on the material.

Conventionally, when molding a protrusion pattern on the body of a tube container, a female mold placed along the outer circumferential surface of the body and a male mold placed inside the body were clamped together. This method uses molds such as the female mold and male mold, which are much harder than the tube container, and the wall thickness of the body is extremely thin, so there is a slight mold misalignment between the male mold and the female mold. Even if this happens, there is a high risk that the body part where the protrusion pattern is formed will break, and even if it does not break, there will be a part that is too thin to be used as a container, and the inside of the body may be damaged. There were disadvantages such as unevenness was formed on the circumferential surface, and the amount of contents remaining in the container increased due to the unevenness.

The present invention was devised to eliminate the drawbacks of the above-mentioned conventional examples, and is a tube in which a ridge pattern is formed only on the outer circumferential surface of the body while the inner circumferential surface of the body remains smooth during molding. In order to form a protrusion pattern only on the outer circumferential surface of the tube container body, the outer circumferential surface of the tube container is heated and softened, and a predetermined pattern molded body is applied to the outer circumferential surface of the body with a desired pressing force. At the same time, the pattern molded body and the tube container are moved at the same speed and in the same direction to form a ridge pattern.

An embodiment of the present invention will be described below with reference to the drawings.
(See Figures 1 and 2 below) Tube container 1 of the present invention
The inner circumferential surface of the body part 2 is in a smooth surface state when the body part 2 is molded, whereas a ridge pattern M is formed on a desired portion of the outer peripheral surface of the body part 2.

Therefore, the inner surface of the tube container 1 is only a smooth surface, and the contents can be poured out very well.As for the external appearance, the ridge pattern M is formed, so it has a bright and dark pattern, unlike a simple printed pattern. And it is rich in variety. The ridge pattern M formed on the outer circumferential surface of the body 2 is formed by the fluid movement of the molding material on the outer surface of the body 2.

Therefore, the thickness of the parts other than the protrusion pattern M on the outer peripheral surface of the body 2 where the protrusion pattern M is formed is uniformly thinned by the amount of molding material necessary to form the protrusion pattern M, so that it is not molded. The protrusion height and width of the protrusion pattern M and the number of protrusions are determined according to the thickness of the portion of the protrusion pattern M that is not formed. Next, to explain the method of forming the protrusion pattern M of the tube container 1 of the present invention, (see FIG. 3 below), the body 2 of the tube container 1 made of synthetic resin is attached to the core bar 3 so as to be non-deformable and immovable. The outer circumferential surface of the body 2 of the tube container 1 assembled to the core metal 3 is heated to a predetermined temperature, and at the same time a patterned molded body 4 (not shown) is formed by cutting and forming pattern grooves 5 on the outer circumferential surface. Although the embodiment has a roller structure, it is not necessarily limited to a roller structure and may be a flat plate structure.

In the following description of the embodiment, it is assumed that a roller structure is used. ) is pressed with a predetermined pressing force and at the same time is rotated relative to the outer circumferential surface of the body 2 without slipping, thereby forming a protrusion pattern M corresponding to the pattern groove 5 on the outer circumferential surface of the body 2. be. The tube container 1 having the protrusion pattern M formed on the outer circumferential surface of the body 2 by the method of the present invention is also preferably one whose bottom is not closed. The part 2 is fitted onto a column-shaped core metal 3 having a diameter equal to the diameter of the body part 2.

At this time, the tube container 1 fitted and assembled to the core metal 3 needs to have its body 2 inner peripheral surface in close contact with the outer peripheral surface of the core metal 3 and be held immovably relative to the core metal 3. . As a means for holding the tube container 1 immovably relative to the core bar 3,
There is a method of making the diameter of the core metal 3 slightly larger than the diameter of the body 20 so that the body 2 can be assembled to the core metal 3 extremely tightly, but such a method does not cause the body 2 to stretch and deform. It is difficult to say that it is effective because there is a risk that the protrusion pattern M is formed, so it is difficult to say that it is effective. Rather, it is quite common to provide another mechanism to hold the portion of the tube container 1 immovably relative to the core bar 3 other than the body 2 portion where the protrusion pattern M is formed. is good. In this way, the outer circumferential surface of the body 2 fixedly attached to the core metal 3 is heated to about 50 [°C] so as to soften the outer circumferential surface portion of the body 2 to a certain extent, and at the same time pattern grooves are formed on the circumferential surface. 5
The pattern molded body 4, which has been cut and formed, is pressed with a predetermined pressing force.
There is no limitation as to which pressing operation should be performed first; for example, if the patterned molded body 4 is pressed against the outer peripheral surface of the body 2 which has been heated to an appropriate temperature by appropriate side radiation heat, the ridge pattern will be formed. Although the molding operation of M can be done quickly and the heat source can be easily controlled, on the other hand, there is a risk that the entire body 2 may be deformed because there is a risk of heating parts other than the body 2 that require heating. In addition, if the patterned molded body 4 is heated to a predetermined temperature, the thickness of the outer peripheral surface of the body 2 to be molded can be set almost accurately, but it has the disadvantage that the molding speed becomes slow. There is. The depth of the pattern groove 5 cut and formed on the outer peripheral surface of the patterned molded body 4 is set to the outer periphery of the body 2 within a range that does not deteriorate the mechanical strength required when the tube container 1 is actually used. It is determined according to the wall thickness of the face part, for example, if the wall thickness of the body part 2 is Im, but the strength as a container when actually used can be sufficiently demonstrated with a wall thickness of 0.8 mm. In this case, the thickness of the outer circumferential surface portion of the body portion 2 where the protrusion pattern M is formed is 0.2 mm.

In this way, even if the thickness of the outer circumferential surface portion of the body portion 2 that is allowed to be formed is a predetermined limited thickness, the depth of the pattern groove 5 does not have to be equal to this thickness;
When the shape of the protrusion pattern M has a large area of concave portions, the protrusion height of the protrusion pattern M, that is, the depth of the pattern groove 5, is determined by the body part 2 as described above.
It can be set to a larger value than the thickness of the outer circumferential surface portion.
However, when setting the form of the pattern grooves 5, it should be noted that the protrusion pattern M formed by the present invention does not occur due to the insertion of protrusions other than the pattern grooves 5 on the outer peripheral surface of the pattern molded body 4. Since the synthetic resin material on the outer circumferential surface of the body 2 that was pushed away flows into the pattern groove 5 and is formed, the amount of synthetic resin material that is pushed away by the protruding portion on the outer circumferential surface of the pattern molded body 4 is and the amount of synthetic resin material flowing into the pattern groove 5 must be set to be equal, and this amount is determined by the pressing force of the pattern molded body 4 against the outer circumferential surface of the body 2 and the outer circumferential surface of the body 2. The pressing force of the pattern molded body 4 and the heating operation require sufficient care because the pressure changes depending on the degree of heating.

The outer circumferential surface of the body 2 of the tube container 1 assembled on the core bar 3 is heated to a predetermined temperature, and at the same time, the pattern molded body 4 is heated with a predetermined pressing force.
While pressing , the outer circumferential surface of the pattern molded body 4 and the outer circumferential surface of the body 2 are moved so as not to slip between the outer circumferential surface of the pattern molded body 4 and the outer circumferential surface of the body 2 to continuously form the protrusion pattern M. molding.

In this case, it is extremely important to prevent slippage between the outer circumferential surface of the pattern molded body 4 and the outer circumferential surface of the body 2. Therefore, as in the illustrated embodiment, the protrusion pattern M is When forming the pattern molded body 4 and the core metal 3 in the circumferential direction of the portion 2, the circumferential speed (or moving speed) of the pattern molded body 4 and the peripheral speed of the outer circumferential surface of the body portion 2 are the same. It is best to rotate them at the same time. As is clear from the above description, in the method of the present invention, the protrusion pattern M is formed from the synthetic resin material on the outer peripheral surface of the body 2. The wall thickness of the section 2 is extremely thin, and it is currently difficult to obtain a wall thickness of the outer peripheral surface of the body section 2 that does not affect the mechanical strength of the tube container 1 in practical use. If this is carried out for the purpose of forming the thin protrusion pattern M, the advantages such as easy molding operation and simple equipment required for molding can be fully utilized. As is clear from the above description, in the present invention, the inner circumferential surface of the body 2 of the tube container 1 that functions as a container is maintained in a smooth state during molding of the body 2, and only a limited portion of the outer circumferential surface is protruded. Since the striped pattern M is formed, there is little residual substance in the tube container 1, and air is not trapped inside the tube container 1 when filling the contents.Furthermore, the ridged pattern M makes it easy to use as a container. It exhibits various excellent functions and effects as a tube container, such as having a varied appearance, and since the body 2 is entirely held by the core bar 3, distortion does not occur during heat treatment. There is no risk of heat treatment, and since only the outer circumferential surface of the body 2 needs to be heated, temperature control is easy, and there is no risk of deteriorating the mechanical strength of the tube container to the extent that it cannot withstand practical use. This method exhibits many excellent effects, such as being able to form the protruding pattern M much more quickly and uniformly than the method of forming the striped pattern M.

[Brief explanation of drawings]

FIG. 1 is an external perspective view of a chewing container according to the present invention, and FIG.
The figure is a sectional view of the main part taken along the cutting line in Fig. 1, and FIG. 3 is a cross-sectional enlarged view of the main part in which the method of the present invention is carried out. Explanation of symbols, 1: Tube container, 2: Body, 3: Core metal,
4: Patterned molded body, 5: Pattern groove, M: Projection pattern.

Claims (1)

[Scope of Claims] 1 A tube container 1 made of thermoplastic synthetic resin, in which a protrusion pattern M is formed protrudingly along the circumferential direction on a desired outer peripheral surface portion of a body 2 of the tube container 1, and 2. A synthetic resin tube container with a smooth inner circumferential surface and a protruding pattern on the outer circumferential surface of the body. 2. A method for forming the protrusion pattern M according to claim 1, in which a synthetic resin tube container 1 and a core bar 3 are arranged such that the inner circumferential surface of the body 2 of the tube container 1 is aligned with the outer circumferential surface of the core bar 3. The patterned molded body 4, which is formed by cutting pattern grooves 5 on the surface of the combination of the tube container 1 and the cored metal 3, is assembled by immovably fitting into each other in a tight form, and is pressed with a predetermined pressing force. At the same time, the outer circumferential surface of the body 2 facing the pattern molded body 4 is heated to 50°C.
The surface of the pattern molded body 4 and the outer circumferential surface of the body 2 which are in pressure contact are moved simultaneously in the same direction at the same linear speed by rotating the core metal 3 at the same time as moving the pattern molded body 4. A method for forming a ridge pattern on the outer circumferential surface of a synthetic resin tube container body, in which a ridge pattern M corresponding to the pattern grooves 5 is formed on the outer circumferential surface of the body 2.