JPS5824256B2 - Forming device for pleated straws - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a plastic straw (hereinafter referred to as a pleated straw) that has pleats in its neck to provide flexibility.
The present invention relates to a molding device used in a manufacturing device that enables adjustment to optimize the pleat shape and enables high-speed molding.

The use of pleated straws is increasing day by day because they are convenient for drinking.

However, despite the increasing demand, the speed of manufacturing equipment has not increased, and there is still no molding equipment that can adjust the shape of the neck of the straw to optimize its pleats. The present invention appears to be the first.

The manufacturing method for pleated straws was already published in Japanese Patent Publication No. 52-3847.
3 is proposed.

However, in the forming apparatus disclosed therein, there is no flat part in the recessed part of the unevenness provided on the rod, into which the straw is inserted and the folds are formed from the inner surface of the rod.

Therefore, the rod has no freedom of movement in the longitudinal direction, and the neck shape of the straw is constant, and on top of that, the gap between the groove and the teeth is widened and narrowed to accommodate high-speed forming. Since there is no flexibility at all, high-speed rotation causes strain, making it difficult to mold at a constant speed or higher.

In order to further enable high-speed forming, if the structure is such that only a pressing force is applied between the groove of the rod and the teeth of the plate, distortion will occur in the uneven shape formed on the straw, and the resulting There have been cases where the convex portions of the pleats have become multi-linear, have a spiral shape, or in the worst case, have been cut off, so that they are not as flexible as they should be.

In addition, if there is a change in the pipe diameter of the straw to be formed, the rotation of the straw will not follow when the rod is rolled to give unevenness to the straw, and the purpose of forming cannot be achieved. It was.

As a result of various studies on the above-mentioned difficulties, the present inventor has developed a molding apparatus having the structure disclosed below, which solves all of them, achieves the purpose of high-speed molding, and furthermore, eliminates the need to replace rods etc. - It has become possible to easily change the pleat shape of the pipe within a predetermined range.

This will be explained in detail below with reference to the drawings.

Fig. 1 shows a continuous manufacturing apparatus for pleated straws equipped with the forming device of the present invention, and Fig. 2 is a side view of the forming device of the present invention, and an enlarged view of the main part of A-A in Fig. 1. , FIG. 3 is a plan view of the same, and FIG. 4 is an enlarged sectional view taken along the line BB in FIG. 2.

First, a pleated straw manufacturing apparatus for using the molding apparatus of the present invention will be described.

The molding device of the present invention can be installed in various manufacturing devices for pleated straws.

For example, as shown in FIG. 1, a hopper 2 for accommodating a raw material straw pipe 1 is provided in the upper part, and a pipe supply drum 3 is coaxially rotatable by a motor 5 in the lower part.
It can be installed in a forming section 6 of a manufacturing apparatus, which is provided with a forming rod holding drum 4 and a forming section 6 near the center of the apparatus.

In this manufacturing device, a large number of rotatable molding head throats 7 constituting the molding device of the present invention are arranged in series on the cylindrical wall of a molding rod holding drum 4. falls into the grooves 8 that are arranged in a row on the outer periphery of the pipe supply drum 3.

Once supplied, the straw pipe is moved to the left in FIG. 1 by the pushing rod 9 sliding in its groove 8 and is inserted over the forming rod 7.

When the straw pipe reaches the forming section 6 as the forming rod holding drum 4 rotates, it becomes the forming apparatus of the present invention.

As a result, it is pressed and rolled, giving it an uneven shape to form pleats.

The straws with the uneven shape are first pressed to the right in FIG. and folded, then the forming rod 7
The product is extracted from the container and is further discharged as a product from the apparatus by the discharge conveyor 25.

Various considerations have been made to each mechanism of this manufacturing apparatus to enable high-speed manufacturing, and it is suitable for employing the molding apparatus of the present invention.

Next, the molding apparatus of the present invention will be specifically explained.

As is clear from FIGS. 2 to 4, the molding apparatus of the present invention has the following features:
A molded rod 7 into which the straw pipe 1 is inserted, and a corresponding uneven shape on the straw pipe.

The main components are a forming roller 11 for imparting a viscosity, and a pressing roller 12 for pressing and rolling the forming rod 7 and the straw pipe 1 fitted thereon between the forming roller 11 and the forming roller 11.

The forming roller 11 is located on the base 13 of the manufacturing device.

It is rotatably installed near the center by a roller support arm 14.

The cross-sectional shape in the longitudinal direction is one of the features of the present invention, and as shown in FIG. The shape forms uneven stripes.

The forming rod 7 is a part of the round bar, that is, a portion corresponding to the neck of the straw pipe, and is also provided with a concavo-convex strip for forming a continuous concavo-convex shape in correspondence with the forming roller 11.

The cross-sectional shape is also one of the features of the present invention, and as shown in FIG.
8 and an embossed blade portion 19 with one side having a long slope.

As mentioned above, the forming rod 7 is rotatably installed on the forming rod holding drum 4 of the pleated straw manufacturing apparatus, and the second
As shown in the figure, it reaches the molding section 6 while following a circular trajectory, rotates at high speed, completes molding, then returns to the starting point by making one rotation while following the circular trajectory, and then repeats the same operation continuously. I will give it back.

The presser roller 12, which is the final feature of the present invention, is made of a material such as rubber or soft plastic (installed opposite the forming roller 11), and is rotatably mounted on a roller holder 20 fixed to a base 13. Supported L-shaped arm 21
A spring 22, which is rotatably installed in the roller holder 20 and whose other end is locked to the L-shaped arm 21, applies a pressing force to the forming rod 7 and the straw pipe 1 inserted therein. give.

The molding is done as follows.

That is, as shown in FIGS. 2 to 4, the molded rod 7
When the straw pipe inserted therein moves and is sandwiched between the forming roller 11 and the presser roller 12, a small pulley 23 (see FIG. 1) provided at the other end of the forming roller 11 is moved by the motor 5. It touches the rotating large pulley 24 and rotates at high speed.

At this time, as shown in FIG. 4, the straw pipe 1 is pressed and rolled by a forming rod 7 with a special cross-sectional shape and a forming roller 11, and is mechanically formed without being heated in any way. be.

By making the forming rod 7 and forming roller 11 have the above-mentioned shapes, particularly having a flat portion, the forming rod 7 or forming roller 11 can be moved and adjusted in the longitudinal direction, and the friction gap can be adjusted. Since it is possible to maintain an appropriate gap for high-speed forming, it is possible to perform high-speed forming, and there is no cutting of the straw pipe. It is now possible to change the spacing and shape of the straw pipe without the need for replacement.

Furthermore, by disposing the presser roller 12 for pressing during molding, the straw pipe completely follows the rotation of the molding rod 7, and there is no distortion or multiple line formation in the uneven shape provided. It is.

The shaping roller 11 has a special shape, especially the protrusion 16.
By providing this, when the straw pipe, which is extrapolated onto the forming rod I and is given a concave and convex shape, is pressed in the longitudinal direction by the pipe compression and discharge rod 10, each convex part moves the long slope outward. It folds easily with the short slope facing inward, forming a regular fold.

The reason why the folding was so successful was because the forming roller was provided with a protrusion, which prevented the bulge of the long slope of the straw during the suppression transfer forming of the straw. It is thought that this is because the long slope portion is prevented from being deformed by regulating the length, so that even when the pipe compression and discharge rod 10 presses the straw in the longitudinal direction, the long slope portion does not deform.

As described in detail above, the forming apparatus of the present invention, in which the specially shaped forming rod, forming roller, and presser roller are appropriately arranged, enables high-speed forming of pleated straws and easily changes the shape of the pleats. It is possible to make changes and provide products without defects.

[Brief explanation of the drawing]

Fig. 1 is a continuous production device for pleated straws equipped with the forming device of the present invention, Fig. 2 is a side view of the forming device of the present invention, and an enlarged view of the main part A-A in Fig. 1, and Fig. 3 is a side view of the forming device of the present invention. The same plan view and FIG. 4 are enlarged sectional views taken along the line BB in FIG. 2. DESCRIPTION OF SYMBOLS 1... Straw pipe, 6... Forming part, 7... Forming rod, 11... Forming roller, 12... Pressing roller , 15...
...Flat part, 16...Protrusion part, 17...
・Embossed blade part, 18...Flat part, 19...
- Embossed blade part.

Claims (1)

[Claims] 1. A forming roller 11 having an outer circumferential surface of a regular repeating shape and a pressing roller 12 having a pressing force by a spring 22 are opposed to each other, with the flat part 15, the protruding part 16, and the embossing blade part 17 as one unit. The forming roller 11 and the presser foot are fitted by inserting a straw pipe onto a movable forming rod 7 which regularly has flat portions 18 and embossing blade portions 19 at a predetermined pitch corresponding to the shape of the forming roller 11. A forming device for a pleated straw, characterized in that forming is performed between rollers 12 to suppress transfer.