JPH03286844A - Production of synthetic resin vessel - Google Patents

Abstract

PURPOSE:To contrive production of synthetic resin vessels, by folding flat a tube formed from a synthetic resin sheet, forming nozzle holes in the folded tube, attaching nozzles to the hole parts, then re-folding flat the tube in a direction perpendicular to the first folding direction, welding opposed sheet parts of the folded tube at positions corresponding to bottom parts and side parts of desired vessels, and cutting up the tube. CONSTITUTION:Nozzles 15a, 15b are attached to nozzle holes 13a, 13b opened in a tube 11 folded flat, and the tube 11 is then moved. Guide rails 22, 23 are arranged along a feed line, and neck parts of the nozzles 15a and 15b attached to the tube 11 are clamped between the guide rails 22 and 23, respectively. The spacing between the guide rails 22 and the guide rails 23 is gradually increased toward the outlet side. As the folded tube 11 is fed forward, central parts of both flat faces of the tube 11 are pulled away from each other, resulting in that the tube 11 is re-folded in a direction perpendicular to the first folding direction. Opposed sheet parts of the re-folded flat tube 11 are welded at a central part 24 with respect to the width direction of the flat tube 11 and at central parts 25 (along middle lines between nozzle parts) with respect to the longitudinal direction of the tube 11. Then, the tube 11 is cut up along the welded parts 24, 25.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for manufacturing a synthetic resin container used for containing, storing or transporting liquid or the like.

[Prior Art] Various shapes have been proposed and implemented as containers generally used for storing and transporting liquids, one of which is a container manufactured by blow forming. For example, as shown in FIG. 7, a cylindrical parison 2 is discharged from a nozzle 1 connected to a molding machine by melting a synthetic resin. The sealing device 3
Seal by. Next, the seal portion of the parison 2 is sandwiched between two molds 5, and air is injected through the hole 4 of the nozzle 1 to expand the container material a into a predetermined container shape.
' (container intermediate) (Fig. 7 ([+)).

Then, a portion of the parison 2 above the container material a' held in the mold 5 is cut using a heat cutter 6 (FIG. 7(c)).

Thereafter, the mold 5 is closed and high-pressure air is supplied from the air supply pipe 8 to form the container material a.
(see Figure 7)).

Thereafter, the mold 5 is opened to take out the container material a'' as shown in FIGS. Container a as shown
It causes the formation of

[Problem to be solved by the invention]

By the way, when a container is manufactured by blow molding as described above, a cylindrical parison is expanded in a mold to form a container material having the approximate shape of the container, and at the same time, a nozzle is integrally formed from this container material. As a result, a lot of firmness occurs around the container. Since this paris is a wasted material, there is a problem that not only is the yield of raw materials poor, but also that the thickness of the container is thick and uneven, resulting in poor accuracy.

In addition, this blow bottom shape is used in the parison discharging process, blow molding process, nozzle molding process, and parison removal process.
Because it involves multiple different processes, it is difficult to perform continuous molding in a short period of time, and especially in the post-process, containers must be handled one by one, making it unsuitable for mass production. .

[Means to solve the problem]

The present invention was made in order to solve the above-mentioned conventional problems, and consists of folding a tube made of a synthetic resin sheet double in the diametrical direction to form a flat tube,
At the center of the flat tube in the width direction, nozzle holes are opened through the tube at predetermined intervals in the longitudinal direction, and nozzles are respectively positioned in the upper and lower nozzle holes opened in the two sheets, Each nozzle is welded to a tube, the flat part of the flat tube is pulled, the bent part is flattened, the flat tube is folded double by changing the bending direction by 90 degrees, and the tube is folded in the middle in the width direction. In this method, a synthetic resin container is manufactured by welding the middle part of each nozzle in the longitudinal direction and cutting the welded part of the tube.

[For production]

Drill holes for nozzles in a tube made of a flattened synthetic resin sheet, attach nozzles to each hole, and change the direction of the flattening so that the nozzles are located at the edge of the tube. Since the bottom is sealed, a large amount of synthetic resin containers can be manufactured efficiently.

〔Example〕

An embodiment of the method for manufacturing a synthetic resin container according to the present invention will be described below with reference to FIGS. 1 to 6.

First, in FIG. 1, reference numeral 11 is a flattened tube made of a synthetic resin sheet having the thickness of the container, and the width W of this tube 11 is equal to the depth D of the container 12, which will be described later.
(length between shoulder and bottom).

The nozzle holes 13 are placed in the center of the flat tube 11 in the width direction at a predetermined interval in the longitudinal direction of the tube II, that is, so as to be the same as the width l of the container 12 shown in FIG. Nozzle holes 13 are made at regular intervals. Needless to say, this hole 13 is opened through the two sheets.

A plurality of feed holes 14 are formed between the nozzle holes 13 at positions outside the width l of the container 12 using a punching device (not shown) (first step).

A nozzle 15 having a bendable flange on the sealing surface is attached to each nozzle hole 13 provided through the flat tube 11 by a method such as welding.

Specifically, as shown in FIG. 2, the nozzle 15a is set in the nozzle hole 13a below the tube 11, and as shown in FIG.
The flange of the nozzle 15a is welded to the periphery of the nozzle hole 13a by a heat sealing device consisting of a heater stand 18 having a heater stand 18 which is movable up and down.

Thereafter, a nozzle 15b having the same structure as described above is set in the nozzle hole 13b located on the upper surface of the flat tube 11, and as shown in FIG. , and the vertically movable heater stand 21, the flange of the nozzle 15b is welded around the nozzle hole 13b (second step).

The nozzles 15a, 1 are inserted into the nozzle holes 13a, 13b made by penetrating the tube 11 folded flat in this way.
5b are respectively mounted along the same axis, after which this tube 11 is moved to the left in FIG.

On the other hand, along the conveyance line of this tube 11, the nozzle 1
Guide rails 22 and 23 in the direction in which 5a and 15b move.
are provided, and nozzles 15a, 1 attached to the front and back surfaces of the tube 11 are attached to these guide rails 22, 23.
Hold the neck of 5b. This guide rail 22.23
are arranged so that the distance gradually increases from the entrance to the exit side. Therefore, when the tube 11 moves forward, the center portions of both sides of the tube 11 are pulled, resulting in a double fold in which the bending position is changed by 90 degrees. In this state, the nozzles 15a are located in opposite directions at both edges of the flat tube 11.

15b is attached.

Next, as shown in FIG.
The central portions 25 of 5a and 15b are fixed by means such as welding (third step).

The center point 24 will form the bottom of the container 12 and the center point 25 will form the sides of the container 12.

Thereafter, by cutting the welded central portion 24 and central portion 25, a synthetic resin container 12 is manufactured as shown in FIG. 6.

The process of attaching the nozzle to the tube was explained as welding as a means of bonding the bottom and sides of the container, but this bonding method can be done by heating and melting, by ultrasonic waves, by high frequency, or by A method using a melt material or, in some cases, a method using an adhesive that can be bonded within a short time can also be adopted.

A sheet-like flange is formed on the nozzle to attach it, but this flange needs to be flexible enough to be folded in half. Since it is fixed to the front and back surfaces of the board, the processing method is simple. Since two containers with their bottoms combined are manufactured at the same time, the containers can be manufactured extremely efficiently.

〔Effect of the invention〕

As is clear from the above description, according to the method of manufacturing a synthetic resin container according to the present invention, a tube made of a synthetic resin sheet is folded double, a nozzle hole is made, a nozzle is attached to this hole, and then the tube is folded. A synthetic resin container can be manufactured by changing the direction by 90' to form a double-folded flat tube, welding the tube at positions corresponding to the bottom and sides of the container 12, and cutting it.

Therefore, by this extremely simple method, multiple synthetic resin containers can be manufactured at the same time, and because it does not produce as much stiffness as in the case of blow-bottomed containers, the yield of raw materials is good and quality can be improved. It can be measured. Since containers can be manufactured from continuous tubes, it is suitable for continuous molding, and is particularly effective in mass production of containers.

[Brief explanation of the drawing]

1 to 6 illustrate an embodiment of the method for manufacturing a synthetic resin container according to the present invention, in which FIG. 1 is a perspective view of a tube with holes such as nozzle holes, and FIG. It is an explanatory view of a state in which the nozzle is attached and the position of the double-folded edge of the tube is changed. FIGS. 3 and 4 are side views of essential parts of the nozzle 7 binding device, FIG. 5 is an explanatory view of welding at predetermined locations, and FIG. 6 is a side view of the container. Moreover, FIGS. 7(a) to 7(g) are explanatory diagrams of an example of a conventional method for manufacturing a synthetic resin container. 1... Nozzle 2... Hollow cylindrical parison 3
... Sealing device 4 ... Hole 5 ... Mold 6 ... Heat cutter 8 ...
・Inlet part 9... Container nozzle 10... Hari
11...Tube 12...Container
13...Nozzle hole l4...Feeding hole 16.19...Base 18, 21...Heater stand 24...Center point 15...Nozzle 17, 20...Heater 2223... ...Guide rail 25...Central part.

Claims (1)

[Claims] A tube made of a synthetic resin sheet is folded double in the diameter direction to form a flat tube, and nozzle holes are opened at a predetermined interval in the longitudinal direction at the center of the flat tube in the width direction. Nozzles are positioned in upper and lower nozzle holes opened in a sheet, each nozzle is welded to a tube, the flat portion of the flat tube is pulled, the bent portion is flattened, and the flat tube is bent at an angle of 90°.
A method for producing a synthetic resin container, in which the tube is double-folded by changing the bending direction, the tube is welded at the middle part in the width direction and the middle part of each nozzle in the longitudinal direction, and the welded part of the tube is cut. .