JPH0431958B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method of sealing the filling opening of a plastic container after filling the container with contents so as to prevent easy opening.

(Prior art) After filling the contents into a plastic container,
Conventional methods for sealing the filling port to prevent easy opening include riveting,
There are things that can be glued. Riveting means that a cap is screwed onto the filling opening of a plastic container, and a rivet is inserted into the side of the cap so as to penetrate through the wall of the filling opening.
This is to prevent the cap from loosening, and the adhesive method is to adhere a sealing member made of thermoplastic to the filling opening of the container using high frequency or ultrasonic waves.

(Problems to be Solved by the Invention) However, with the above-mentioned prior art riveting, there is a risk of leakage of the contents from the rivet hole or corrosion of the rivet, and the cost of the rivet parts increases, and the rivet Since this requires a driving operation, there are problems in terms of sealing performance, product price, and workability. In addition, in the case of conventional adhesives, there is a risk of leakage if the contents are liquid, high frequency or ultrasonic adhesive equipment is expensive, and the work is not easy. I had a problem.

The present invention solves the problems of the prior art in the method of sealing the filling opening of a plastic container, namely, the risk of poor sealing, increased product cost, and poor work efficiency.

(Means for Solving the Problems) In order to solve these problems, the present invention seals the filling opening of a plastic container by the following means. That is, an inner stopper made of a cylindrical thermoplastic plastic having a threaded part on the inner periphery fixed to the filling opening of the plastic container main body, and a threaded part on the outer periphery that is screwed into the inner stopper with a slight deviation from the threaded part of the inner stopper. A stopper made of thermoplastic plastic provided in the inner stopper is screwed on by high-speed rotation, and the stopper is fused to the inner stopper by the frictional heat generated at the time of screwing in the threaded part, and the stopper and the inner stopper are fused together. The filling opening of the plastic container was sealed by screwing the plastic container.

The present invention will be explained below using the accompanying drawings.

Figure 1 is a perspective view of the container body and stopper before sealing;
FIG. 2 is a sectional view taken along lines A--A and B--B of the cutting stopper in FIG. 1, and FIG. 3 is a sectional view of the container after being sealed.

The container body 1 is made of thermoplastic such as polyethylene and is obtained by blow molding. A filling port 2 for filling the contents is opened at the top of the container body 1, and an inner stopper 3 shown in FIG. 4 is fixed to the filling port 2.

The inner stopper 3 is made of cylindrical thermoplastic plastic with a threaded portion 3a on the inner periphery, and a thread of 10 to 1000 μm on the outer periphery.
Film-like protrusions 3b and unevenness 3c having a thickness of
is formed. The inner stopper 3 is set in a blow molding mold when blow molding the container body 1, and the film-like protrusions 3 are formed by heat during blow molding.
b is melted, thereby being fused to the filling port 2 simultaneously with the molding of the container body 1, and also being engaged and fixed by the projections and depressions 3c. The reason why the container body 1 and the inner stopper 3 are made as separate parts is that it is difficult to manufacture a hollow product with a threaded part on the inner periphery on a factory scale by blow molding, and the resulting product is expensive. The reason why the film-like protrusion 3b is fused and fixed by melting is to prevent leakage even when the contents stored in the container body 1 are liquid.
Therefore, if the contents are in powder or granular form, the outer periphery of the inner stopper may have only an uneven shape and be engaged and fixed to the filling opening of the container body during blow molding, or the filling of the container body may be prevented after blow molding. It may fit into the mouth.

The plug body 4 is made of thermoplastic plastic, has a threaded portion 4a on its outer periphery that screws into the threaded portion 3a of the inner plug 3 with a slight deviation, and has a recess 4b for inserting an electric screwdriver in the center of the upper surface. . Nakasei 3
The threaded part 3a of the plug body 4 and the threaded part 4a of the plug body 4 are formed so as to be screwed together with a slight deviation as described above, so the threaded state is not smooth and there is some resistance. . In addition, as the thermoplastic plastic for forming the inner stopper 3 and the stopper body 4, a hard type such as hard vinyl chloride resin is used.

After filling the container body 1 with the contents, the stopper 4 is screwed and fixed to the inner stopper 3 by rotating at high speed to seal the container filling opening.

(Function) Since the screw parts 4a and 3a are formed so that the plug body 4 and the inner plug 3 are screwed together with a slight deviation, when the plug body 4 is rotated at high speed and screwed into the inner plug 3, Frictional heat is generated in the threaded portion, and the threaded portions 4a and 3a are melted by this frictional heat, and the plug body 4 and the inner plug 3 are fused together.

Moreover, since the screwing of the plug body 4 and the inner plug 3 is done by threaded portions that are slightly offset from each other, the screwing itself is hard and reliable.

(Effects of the Invention) The present invention involves screwing a stopper made of thermoplastic plastic into an inner stopper made of thermoplastic plastic fixed to the filling opening of a plastic container body by high-speed rotation, and the frictional heat generated at that time being screwed. The plug body and inner plug are fused together, and the filling port is sealed so that it cannot be easily opened. Therefore, it is tightly and reliably sealed by both screwing and fusion, and there is no risk of leakage even with liquid contents. Moreover, the inner stopper and the stopper body are cheaper than conventionally used rivet parts, and are advantageous in terms of product price. Furthermore, in terms of workability, it is only necessary to screw the stopper into the inner stopper using a high-speed rotating fastener such as an electric screwdriver, which is very quick and efficient. Additionally, high speed rotating fasteners have the advantage of being incomparably cheaper than high frequency or ultrasonic bonding devices.

[Brief explanation of drawings]

The drawings relate to the present invention; FIG. 1 is a perspective view of the container body and stopper before sealing, FIG. 2 is a cross-sectional view taken along cutting lines A-A and B-B in FIG. 1, and FIG. 4 is a longitudinal sectional view of the container after being sealed, and FIG. 4 is a perspective view of the inner stopper. 1...Container body, 2...Filling port, 3...Inner stopper,
3a...screw part, 3b...film-like projection, 4...
...Plug body, 4a...Threaded part.

[Claims]

1. Install a pump and a flow meter in sequence from the tank side to the oil supply pipe connected to the oil storage tank, connect the oil supply nozzle to the discharge side of the flow meter via the oil supply hose, and drive the flow meter's flow pulse generator and the pump. motor,
In a refueling device capable of quantitative refueling in which a refueling amount display meter, a refueling switch, and a fixed amount setting switch are connected to a control device, a fixed refueling storage means for storing a fixed amount of refueling when a fixed amount of refueling is performed, and a memory for storing a predetermined amount for addition and subtraction. means, and if during normal lubrication, the fixed quantity lubrication storage means stores that the previous lubrication was a fixed quantity lubrication, a subtraction function for deleting one pulse every time a predetermined number of liquid volume pulses arrive is stored in the storage means. The process is continued until the number of pulses corresponding to the fixed amount is reached, and if the fixed amount lubrication storage means does not have a memory indicating that the previous lubrication was a fixed amount lubrication during fixed lubrication, add one pulse every time a predetermined number of flow rate pulses arrive. A refueling device comprising: a control means for controlling the pulse count until a number of pulses corresponding to a predetermined amount stored in the storage means is reached.