JPS5844066B2 - Manufacturing method for infusion bottles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing an infusion bottle or the like made of synthetic resin by biaxial stretching.

In recent years, along with improvements in the direct blow method, development of the stretch blow method has become more active.

This stretch blow molding method (stretch blow molding method) has the advantage of increasing strength by utilizing the orientation of the resin, and also has an excellent appearance.

However, for molded products such as infusion bottles that require the spout and the hanging ring to be placed in opposite positions, the manufacturing method is technically difficult, and foreign matter such as dust is generated throughout the entire molding process. There were drawbacks such as the inability to maintain the product to prevent contamination inside.

This invention was made in view of the above circumstances, and its purpose is to cover the mouth of a semi-finished product with a mouth formed in advance with a cap made of a heat-resistant elastic material, and to carry out the desired length of time with the cap still on. It is an object of the present invention to provide a method that performs biaxial stretching molding and prevents foreign matter such as dust from entering the molded product.

EMBODIMENT OF THE INVENTION Hereinafter, a detailed description will be given along the order of the molding process based on drawings showing embodiments of the present invention.

Figure 1 shows a semi-finished product 1 molded by blow molding or the like using a required synthetic resin.
The portions that will become a and the bottom portion 1b (on which the hanging ring 2 is formed in the illustrated example) are preformed.

This semi-finished product 1 is formed into a bottle shape as shown in the figure, and immediately after being formed, a cap body 3 is formed as shown in FIG.
is covered.

The cap body 3Q is attached to the opening 1a of the semi-finished product 1 in an airtight manner, and is made of an elastic material such as rubber or synthetic wood fJ51, and is required to withstand higher heat than the semi-finished product 1. Yes, and yes! It has a cylindrical shape with a head, and a circumferential groove 3a is provided on its outer circumference.

The semi-finished product 1 is then stored covered with the camping body 3 as shown in FIG. 2, that is, in a sealed state to prevent dust from entering inside the semi-finished product 1.

FIG. 3 shows a state in which the circumferential groove 3a of the cap body 3 attached to the semi-finished product 1 is suspended by the clip 5 of the jig member 4.

This jig member 4 is attached to the required position of the clip 50 (the above semi-finished product 1
A through hole 6 is bored at the axial center position of the clip 5, one end of the clip 5 is fixed to a pipe member 7, this pipe member 7 is externally supported by a rod member 8, and this rod member 8 is fixed to a substrate 9. In the structure shown in FIG. 3, the pipe member 7 and the rod member 8 are engaged to be rotatable and vertically movable; however, the present invention is not limited to this structure. isn't it.

The semi-finished product 1 suspended by the jig member 4 in this way is guided to a required heating furnace (not shown) and stretched at an appropriate temperature (set appropriately depending on the material of the semi-finished product 1) above the glass transition point and below the melting temperature. temperature) and sent to the next molding process (molding device).

The molding process is biaxial stretch blow molding of the semi-finished product described above, which includes a cooling process of the bottom part 1b (hanging ring 2) of the semi-finished product 1;
The process is divided into a process of stretching the semi-finished product 1 in the axial direction, a blow molding process, and a mold release process.

In the cooling process of the bottom part 1b (hanging ring 2), as shown in FIG. As shown by arrow A, the bottom mold 1 is removed by the hydraulic cylinder 11°11.
This is done by moving the rings 0 and 10 and sandwiching the suspension ring 2 to cool it.

Next, a stretching process is performed while the hanging ring 2 (bottom portion 1b) is gripped by the bottom mold 10 as described above.

This stretching process is performed by moving the jig member 4 attached to the opening 1a of the semi-finished product 1 upward by appropriate means as shown by arrow B.
The semi-finished product 1 to which it is attached is also stretched from its original position shown by the chain line to the position shown by the solid line in FIG.

The upward movement of the jig member 4 can be easily performed, for example, by pulling up the clip 5 of the jig member 4 with a lever or the like, or by pinching the pipe member 7 and moving it upward.

Next, in the blow molding process, the container molds 12, 12 are attached to the semi-finished product 1 by a hydraulic cylinder 13.1 as shown by arrow C.
Press 3 to cover.

In particular, it is essential that the container mold 12 be accurately aligned with the bottom mold 10 and the cap body 3.

In addition, during the previous stretching step, the cap body 3 is moved slightly higher than the required position, and after the container mold 12 is completely closed, the cap body 3 is fitted into the hole 12a and pressed. Good too.

A needle-shaped blowing nozzle 14 is inserted into the cap body 3 independently (or in conjunction with the operation) of these container molds 12 through the through hole 6 of the clip 5 as shown by the arrow. Furthermore, the tip of this blowing nozzle 14 pierces through the cap body 3 and is exposed to the inside of the semi-finished product 1.

Then, a required fluid (air or other gas, etc.) is injected through this blowing nozzle 14, and a required infusion bottle 15 is formed as shown by the chain line in FIG.

After the molded infusion bottle 15 is cooled for a required period of time (left for a few seconds to 10-odd seconds), it is removed from the container mold 12, etc., and this mold release process involves moving the blowing nozzle 14 in the opposite direction of the arrow to the container. This is accomplished by moving the mold 12 in the direction opposite to arrow C and the bottom mold 10 in the direction opposite to arrow A.

Next, after removing the cap body 3 from the jig member 4 and also removing the cap body 3 from the infusion bottle 15, a protective cap 16 for transportation and storage is attached to the opening 1a of the infusion bottle 15 as shown in FIG. This completes the molding process.

The mouth portion 1a and the hanging ring 2 of the infusion bottle 15 may have the same shape as when the semi-finished product 1 is molded, so no special finishing process is required.

Further, when further post-processing such as surface printing of the infusion bottle 15 is performed, the bottle is sent to the next process with the protective cap 16 attached as described above, but the present invention is not limited to that process.

In addition, to explain the above-mentioned steps and members in more detail, the semi-finished product 1 may have the shape shown in FIG.
It is advantageous to have a protruding part, and by forming the mouth part 1a and the bottom part 1b in advance at the stage of semi-finished products, unnecessary parts such as "bumps" can be removed after blow molding as shown in Fig. 4. It is possible to omit this step.

In addition, if the bottom part 1b is particularly flat, a protruding piece may be provided on a part of the bottom part 1b in order to smoothly carry out the stretching process, and it may be removed as a "beam" during or after blow molding.

In addition, since the parting line during initial semi-finished product molding and the parting line during stretch blow molding are made to coincide, the generation of unnecessary "burrs" and striations can be suppressed.

The cap body 3 shown in FIG. 2 is made of an elastic material as described above, but silicone rubber, for example, has heat resistance.
Even if the needle-shaped blowing nozzle 14 shown in FIG. 4 is repeatedly pierced, any material that can be used as long as the part can be closed by elasticity and the seal can be maintained once the blowing nozzle 14 is removed.

It is necessary for the cap body 3 to prevent the mouth portion 1a of the semi-finished product 1 from being heated to a temperature suitable for molding during the heating process, and consideration is given to the structure and size to prevent heat conduction as much as possible.

Further, in the jig member 4 shown in FIG. 3, a through hole 6 is provided in the clip 5 that holds the cap body 3, but the shape of the clip 5 is bifurcated and the through hole 6 is omitted. There may be.

The pipe member 7 and rod member 8 for rotation and vertical movement are not limited to the illustrated structure, but may be any structure as long as they perform the same function.

Since the bottom forming mold 10 shown in FIG. 4 is used to sandwich and cool the hanging ring 2 on the bottom part 1b of the semi-finished product 1, compressed air is blown to particularly enhance the cooling effect of the hanging ring 2. Additional auxiliary measures may also be used.

In addition, since the bottom mold 10 is clamped when the hanging ring 2 is at the appropriate temperature for molding, it is possible to make the semi-finished product 1 into a rough shape and complete the molding when clamped. No problem.

The point is to cool the hanging ring 2 as quickly as possible so that it can support the bottom part 1b of the semi-finished product 1 during the stretching process shown by arrow B in FIG.

Further, especially when the cross-sectional shape is square, etc., consideration should be given to the thickness corresponding to the finished shape when extruding the parison.

When actually using the infusion bottle 15 formed in this way, turn the top and bottom of the state shown in FIG. It is used with 1a facing down.

As described in detail above, according to the present invention, a cap body made of a heat-resistant elastic material is placed over the mouth of a semi-finished product whose mouth and bottom have been previously formed from synthetic resin, and the cap body is mounted on a jig. Heating while suspended by a member and 2
Since axial stretch molding is performed, it is possible to prevent foreign matter such as dust from entering the molded product throughout the entire process, and the parting lines of the two molding processes can be aligned, and the parting line can be easily adjusted during stretch blow molding. It has excellent effects, such as preventing the occurrence of "burrs" at the mouth and bottom, omitting finishing, making the process simple, not requiring complicated equipment, and being suitable for mass production.

Furthermore, according to the present invention, the cap body is made of a heat-resistant elastic material and is heated while being placed over the mouth part, so that only the mouth part is not heated, and therefore during the biaxial stretching process. Therefore, the opening of the semi-finished product can be used as it is as the opening of the product.

Further, since the circumferential groove is provided on the outer peripheral surface of the cap body, it is possible to easily suspend and stretch the cap body using a jig member or the like.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention in the order of steps; FIG. 1 is a side view showing the state of a semi-finished product, FIG. 2 is a partially cutaway side view showing the state of FIG. Fig. 3 is a side view showing the state attached to the jig member, Fig. 4 is a front view showing a section of the mold part to explain blow molding, and Fig. 5 is a partially cutaway front view showing the completed state. It is. 1... Semi-finished product, 1a... Mouth part, 1b.
...Bottom, 3...Cap body, 4...
...Jig member, 10...Bottom mold, 12.
... Container mold, 14 ... Blow nozzle,
15... Infusion glue

Claims (1)

[Claims] 1. A cap body made of a heat-resistant elastic material and having a circumferential groove on the outer circumferential surface is airtightly placed over the mouth of a semi-finished product whose mouth and bottom have been formed in advance from synthetic resin, and temporarily fixed.
This cap body is suspended by a jig member using its circumferential groove and the semi-finished product is heated to a required temperature.Then, the semi-finished product is moved into a mold and the bottom of the semi-finished product is fixed with an appropriate member. While gripping and cooling, the cap body is moved upward to stretch in the axial direction, then the container mold is closed, and fluid is injected into the semi-finished product from a blowing nozzle penetrating the cap body to achieve the desired shaping. A method for manufacturing an infusion bottle, characterized in that: