JPS63172630A - Molding of synthetic resin container - Google Patents

Abstract

PURPOSE:To mold a container having good stability and being completely closed, by constituting a male mold and a female mold for molding without necessity of a leg piece molding part, compressing a synthetic resin material heated and softened in the female mold and separating the male mold quickly from the female mold to cool and harden the material. CONSTITUTION:A sheet-like synthetic resin material A is placed on an edge face molding part 7 of a female mold 5 and then heated to soften in a molten state. A male mold 1 is lowered from the upper part and the edge face molding part 3 is contacted with the edge face molding part 7 of the female mold 6. Thereafter, air is sucked from a sucking hole 9 for a molding material to compress it under vacuum. The synthetic resin material A is compressed between both molds 1 and 5 and a molded container is pressed in a softened state. At this time, the synthetic resin material A being pressed in a leg piece molding part 8 with a rim bottom is compressed by a bottom molding part 4 of the male mold 1 and a hollow part C is thereby formed. Then, the male mold 1 is quickly pulled up, instantaneously cooled and taken out of the female mold 5 to mold a molded container.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method for molding eight synthetic resin materials by heating and press-molding a foamable or non-foamable synthetic resin material.

BACKGROUND OF THE INVENTION Containers made from conventional synthetic resin materials generally do not have threaded ends molded into their bottoms, like ceramic bowls. This not only makes the bottoms of these containers made of synthetic resin unstable, but also makes them unusable in some cases, resulting in many inconveniences and inconveniences. Therefore, the inventor of the present application has been conducting research for many years.
As a result of repeated research, we developed a method for molding string tails into containers made of these synthetic resin materials.

For example, in the invention of JP-A No. 59-45113, a mold for molding the bottom of a synthetic resin container, etc., and a molding method thereof were disclosed. That is, the molding-h-method according to this invention is a mold for molding the bottom of a desired shape. A molding type JIII, which is equipped with a movably provided bottom mold for molding thread tails or leg pieces, and a pressurizing mold which is movably provided inside the mold;
11. A bottom mold such as a synthetic resin container, which is a male mold having four parts on its inner surface corresponding to the bottom mold, is provided, and a female mold opposite to the bottom mold of the male mold is provided. A method in which the inner surface is recessed in an area surrounding the mold and a pressure mold that can move up and down is attached to the recessed part, and in thermoforming of a synthetic resin sheet, the threads at the bottom of a container etc. molded into a female mold are used. Insert a female bottom mold into the recess for forming the butt or leg piece, and then
One method is to pressurize the bottom wall portion from the inside and press-fit a softened synthetic resin to form the bottom wall, and the other is to pressurize the bottom wall portion of a container, etc. from the outside by recessing the bottom molding portion of a female mold. method. This molding method is characterized by molding the bottom and legs separately, which requires a pressure mold, which not only complicates the molding process, but also requires a high degree of skill in the processing process. There were many problems in terms of quality and cost of the molded container.

Problems to be Solved by the Invention The problems to be solved by the present invention lie in solving the problems of the conventional methods as described above.

In other words, the problem that the present invention attempts to solve is that the pressurizing mold for forming the thread end used in the conventional molding method is not required, and the thread end is formed on the leg using only the molding die and the female mold. This is where the material can be molded.

11 Steps to Solve the Problems The present invention is an invention that improves the conventional molding method disclosed by the inventor of the present application, and includes a container molding part, an edge molding part, and a leg molding part. A container molding method in which a male mold and a female mold for container molding are provided, and a synthetic resin material is heated and pressure-bonded using three solid molds. A synthetic resin container consisting of a mold and a female mold, in which heated and softened synthetic resin material is pressed into the female mold, and the male mold is rapidly separated from the female mold to cool and harden. This is a molding method in which a convex leg molding part is protruded from the inner bottom surface of the male mold for molding 1γ1, and a mold material that does not require a leg molding part is provided on the bottom surface of the acid mold for molding. All of these problems can be solved by rapidly reducing the pressure of the softened synthetic resin material press-fitted between the two molds, and quickly separating the two molds to form thread tails on the leg pieces. can. That is, the means for solving the problems of the present invention are as follows: (1) No leg molding portion of the protrusion is provided on the bottom of the male mold for molding. ■ By simply providing a convex leg molding part on the inside of the bottom of the female mold, it is possible to mold the thread tail on the leg even if the inside bottom of the LLI mold is flat. There are things like doing things like that.

Function The present invention is a molding method in which a synthetic resin sheet is softened by heating and a male mold for molding is press-fitted between female molds. It becomes possible to form thread tails on the legs. In other words, if one of the two molding female molds has uneven leg molding parts, a heat-softened synthetic resin sheet can be press-fitted between the two molds to form a container exactly as the molds, and both molds can be quickly removed at the same time. When separated, the pressure is reduced in the part of one leg, and by abruptly pulling one of the legs apart toward the E section or the F section,
Thread tails will be formed on the legs.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will now be described with reference to the drawings.

FIG. 1 shows a mold material for molding used in the molding method of the present invention, which consists of a Jdt mold 1 for molding and a female mold 5 for molding. This figure shows the mold for a bowl-shaped food container for udon, ramen, etc. Both molds are used to form this bowl-shaped container! , 5 are molded. That is, the male mold l for molding includes the container molding part 2.
, an edge molding part 3 and a bottom molding part 4 are molded, while the female mold 5 has a container molding part 6 and an edge molding part corresponding to the male mold 1, and the bottom part has a molding part 6 and a rim molding part 4. A thread tailed leg piece molded portion 8 is molded which projects downward. In addition, 9 is a suction hole for the molding material of the container made by heating and softening the sheet-like synthetic resin material A, and is provided for vacuum compression.

FIGS. 2 and 3 show the molding method of the present invention. First, as shown in Fig. 1, a sheet-shaped synthetic resin material A is placed on the edge molding part 7 of the female mold 5, and the synthetic resin material A is heated to soften it to a six-dimensional state. let

Next, the desired male mold 1 is partially lowered, the edge molded part 3 is joined to the edge molded part 7 of the female mold 5, and air is sucked from the molding material suction hole 9. and vacuum compress. Then, as shown in Figure 2, the synthetic resin material A will be
The molded portion iB as shown in FIG. 3 is press-fitted in a soft state. At this time, as shown in FIG. 2, the synthetic resin material A press-fitted into the thread end leg piece molding part 8 is compressed by the bottom molding part 4 of the female mold 1, and the air conditioning part C is molded. become. Furthermore, the female mold 1 for molding is rapidly pulled out, F is lifted (momentarily raised) and instantly cooled to form the female mold 5 for molding.
Take it out. Then, the molding part nB as shown in FIG. 3 is molded. In other words, a molded container B consisting of a container body a, an edge surface, a bottom surface C1, a leg piece d, and a thread end e is molded.

4 to 6 show other embodiments.

As is clear from FIG. 4, in this method, one inner convex leg piece molding part 8 with a thread end is molded in the bottom acid 1i part 4 of the female mold 1 for molding, and on the other hand, the molding part # The inner bottom surface of the mold 5 is molded without providing a leg molding part. therefore,
As shown in Figure 5, both j4t'! 1 and 5 are fitted together, the synthetic resin material A is pressed, and the female mold 5 for molding is rapidly pulled downward. A cavity C is formed on the lower side of the thread tailed leg piece molding part 8, and a protruding part is formed. will be formed. This is a phenomenon that occurs when the thread tailed leg piece forming portion 8, which is vacuum-compressed, is rapidly reduced in pressure during rapid processing to the lower side of the mold.

As a result, as shown in FIG. 6, a molded container B similar to the molded container B shown in FIG. 3 is obtained. Furthermore, the method of heating and cooling the synthetic resin material A is the same as the conventional method. Further, although this embodiment shows a method for forming a bowl container, it goes without saying that the same effect can be obtained for containers of any shape if the same method is used.

Effects of the Invention Since the present invention is configured as described above, in the thermoforming of a foamable or non-foamable synthetic resin sheet, an endless thread tail is formed at the bottom position at the same time as the container is formed. Alternatively, the leg pieces can be molded, and by forming the bottom part and the uneven leg part, the outer surface of the thread end or leg piece is formed, and an inner cavity is once formed inside it, and the first Because the synthetic resin is pressurized and press-fitted, the filling density and filling density can be made larger than the main body of the container, so it is possible to mold a container that is extremely stable and completely closed. From the specific effects of C1, it can be said that C1 is a method of molding synthetic resin containers that yields products of better quality and cheaper than the conventional molding method.

[Brief explanation of the drawing]

Figure 31 is a cross-sectional view showing the male and female molding phases according to the method of molding a synthetic resin container of the present invention, Figure 2 is an explanatory schematic diagram showing the molding method of the present invention, and Figure 3 is the main A schematic diagram showing a container molded by the molding method of the invention, and FIGS. 4 to 6 are explanatory diagrams showing other embodiments in comparison with FIGS. 1 to 3. . 1...Female mold for molding 2.6---Container molding part 3.7---Edge hardening part 4---Bottom molding part 5--- --- Female mold for molding 8 --- Leg piece molding section with thread end 9 --- Suction hole A for molding material --- Synthetic resin material B --- Molding container c --- --Cavity part D...-Protrusion part a...
...Container body b -----Edge surface C...
・Bottom surface d・-・−Leg piece e・−・Item end 1st wJ C ((b) Fig. 6

Claims (1)

[Claims] 1. A male mold and a female mold for molding a container are provided, which are formed by molding a container molding part, an edge molding part, and a leg molding part, and the molds are used to mold a synthetic resin material. In a method for molding a container in which the leg piece molding part is not required, the container molding method comprises a female mold for molding which eliminates the need for the leg molding part, a synthetic resin material that has been softened by heating is pressed into the female mold for molding, and A method for molding a synthetic resin container, characterized by rapidly separating a male molding mold from a female mold and cooling and hardening it. 2. A convex leg molding part is molded protrudingly on the inner bottom surface of the male mold for molding, and a leg molding part is unnecessary on the bottom surface of the female mold for molding, as claimed in claim 1. Method for molding synthetic resin containers.