JPS5951076A - Flexible container - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a container made of soft material for accommodating granular materials for transport or storage purposes.

Many conventional flexible containers are made of poor electrical conductors, which can generate static electricity during transportation, cargo handling, and discharge, giving workers electric shocks, or when working in flammable gas atmospheres. There was a risk of fire or explosion. For this purpose, containers are made of conductive tarpaulin material and grounded with a grounding wire during discharge work. There were problems such as the grounding part being damaged and becoming useless.

This invention is based on the fact that the loading machine that suspends containers during loading and unloading is electrically conductive.By discharging static electricity via the loading machine, it is possible to reduce the risk of electrical shock to workers and prevent flammable gas from being released. The purpose is to prevent the atmosphere from igniting.

The present invention will be explained below based on illustrated embodiments.

In Fig. 1, l is a cylindrical bag-shaped main body, 2 is a filling port provided on the top surface, 3 is a cover for the filling port, 4 is a discharge port provided on the bottom surface of the main body, 5 is a discharge port cover, is made of the tarpaulin material shown in Figure 2 and Figure 3.

The tarpaulin material shown in FIG. 2 has layers 7, 7 of conductive rubber or conductive soft synthetic resin laminated on both sides of a base fabric 6,
The layers 7 and 7 on both sides are fused together through the grain of the base fabric 6. However, the tarpaulin material shown in Figure 3 is
A base cloth 6 is impregnated with a conductive adhesive 8, and layers 7.7 of conductive rubber or conductive soft synthetic resin are adhered to both surfaces thereof. In both cases, the conductive layer 7.7 is
O6~” has an electrical resistance value of 0 Ωm or less,
The conductive adhesive 8 also has an electrical resistance value equivalent to this. The conductive layers 7.7 on both sides of the base fabric 6 are thus mechanically and electrically bridged through the fabric grains.

When manufacturing the main body 1, filling port 2, discharge port 4, etc., described above, tarpaulin material cut into the required shape is electrically and mechanically bonded by adhesion with a conductive adhesive or heat welding, and bonded as necessary. Reinforce the joint with a sewing hook and assemble.

Suspension belts 9,9... are firmly attached to the side wall of the main body 1. This hanging belt is woven using a mixture of carbon fiber yarn or metal fiber yarn in the driving system, and is made to have an electrical resistance of 10 to 100 cm or less.

As shown in FIG. 4, the hanging belt 9 is folded in half so that the upper part forms a loop 10, and the lower part is adhered to a belt seat sheet 11 made of the same tarpaulin material as the main body 1 using a conductive adhesive. A restraining sheet 12 made of the same tarpaulin material is pasted on top using a conductive adhesive, and the bell I-seat sheet 1 is attached.
1. The suspension belt 9 and the restraining sheet 12 are reinforced with a sewing machine hanger 13 to form a suspension part. This hanging portion is attached to the main body 1 by bonding the belt seat seat 1-11 to the side wall of the main body 1 with a conductive adhesive and by sewing 14.

Finally, a conductive rope 1 is attached to the loop 10 of the hanging belt 9.
5. Attach the chain yet. As the conductive rope 15, one made of twisted carbon fibers or metal fibers, or a wire rope is used.

Generally, in the case of a tarpaulin material in which a conductive substance is laminated on both sides of a base fabric, the electrical resistance between the conductive substance layers on both sides is quite high, but in the tarpaulin material used in this invention, the conductive substance layers on both sides are Because it is bridged through the grains of the fabric, its electrical resistance is low. In addition, when two sheets of this type of conductive tarpaulin material are stacked and joined together using a sewing machine hook or the like, the electrical resistance between the two materials does not necessarily decrease, but it is possible to use a conductive adhesive between the materials. If so, the electrical resistance will decrease. Therefore, in the above-described embodiment, the electrical resistance between the discharge port 4 and the lifting rope 15 is extremely low, so when the lifting rope 15 is lifted by a crane or the like during cargo handling or discharge, the main body 1 and the discharge port The static electricity generated in 4 is discharged from the hanging rope 5 toward the crane, etc. Therefore, electric shock to workers and ignition of flammable atmospheric gas can be prevented.

In order to confirm the effects of this invention, 500 kti of synthetic resin raw material powder was stored in each of the non-conductive container and the container of Example 2, and the containers were suspended using a hoist equipped with a wire rope and an iron hook, and then discharged. 1" was opened to discharge the contents, and the potential of the discharge port and the potential of the discharged material were measured at that time. The results are shown in FIG. Curve A is the potential change at the outlet of the non-conductive container, curve B is the potential change of the discharge from the same container, curve C is the potential change at the outlet of the container of the above example, and the curved line is the potential change of the discharge from the same container. It shows the change in potential of an object. In addition, the temperature at the time of temperature setting was 28°C1
The atmospheric humidity was 64%, and a rotating sector type potential measuring device was used to measure the potential. Still, the X mark in each curve indicates the discharge completion time.

As is clear from the curve in FIG. 5, the charging at the container discharge port reaches a maximum of 6 KV in a non-conductive container and continues for a while after completion of discharge, but in the container according to the present invention, the charging at the discharge port is is only 300V
Moreover, it disappeared as soon as the discharge was completed. However, the electrostatic charge of the waste was only about half that of the container according to the present invention compared to the conventional container.

As described above, according to the present invention, static electricity generated during loading and unloading of flexible containers is quickly discharged through a loading machine such as a crane, so that work can be carried out without having to perform complicated grounding work each time. This effectively prevents electric shock to personnel and ignition of flammable gas. Therefore, it has a significant contribution to occupational safety and disaster prevention.

[Brief explanation of drawings]

FIG. 1 is a sketch of an embodiment of the present invention, FIGS. 2 and 3 are enlarged sectional views of the tarpaulin material used in this invention, FIG. 4 is an enlarged sectional view of the hanging part in FIG. 1, and FIG. The figure is a charging potential curve diagram of the present invention and a conventional product. 1... Main body, 2... Filling port, 4... Discharge port, 6...
... Base fabric, 7... Conductive layer, 8... Conductive adhesive,
9... Hanging belt, 10... Loop, 15... Conductive rope. Patent applicant: Shibata Kogyo Co., Ltd. Director: Satoshi Shimizu and 2 others '41

Claims (1)

[Claims] (1) Layers of conductive rubber or conductive synthetic resin are laminated on both sides of the base fabric, and both layers are bridged to each other through the grain of the base fabric, or conductive adhesive is applied to the base fabric. A bag-shaped main body having a filling port and a discharging port on the upper and lower surfaces is formed using tarpaulin materials that are cross-linked with each other via an agent. Hanging /L/
) Secure the flexible container by connecting a conductive rope chain to the loops of this hanging belt.