JPS6018348Y2 - Bags for the interior of containers such as drums - Google Patents

Description

[Detailed explanation of the idea] This invention relates to bags for the interior of containers such as drums.

Generally, metal containers such as open drums and bale cans are internally cleaned and reused after use, but when these types of containers are used to store paints, adhesive emulsions, lubricants, etc. Since these substances generally have high stickiness, the cleaning operation is quite troublesome, requiring a long time and a great deal of effort, and the cost involved cannot be ignored.

In view of the above-mentioned circumstances, this idea was made with the intention of avoiding the increase in costs caused by cleaning the container, and was designed to be able to be manufactured at a low cost to the extent that it is disposable, and yet to have the desired toughness. The purpose of the present invention is to provide a container inner bag having properties such as elasticity, shape retention, and moisture resistance.

As a distant relative of this purpose, the bag according to this invention is a substantially rectangular parallelepiped bag that is placed inside a container such as a drum, and includes a kraft paper 2, an aluminum foil 3 glued to the top surface of the kraft paper 2, A rectangular sheet 1 consisting of a thermoplastic resin layer 5 provided on the upper surface of an aluminum foil 3 is bent into a U-shaped longitudinal section with the thermoplastic resin layer 5 inside, and the opposing sheets 1
Each side of the pair of vertical walls is bent inward, and
The side edges 6 of the sheet 1 are brought together oppositely and heat-sealed to form side walls, with 1 formed on both sides of the horizontal wall.
A pair of outwardly projecting triangular tongues 12 are each folded up and affixed to the side wall, and the non-folded portion of the horizontal wall serves as a bottom wall;
A container such as a drum can, in which a plurality of notches 13 are vertically made in the upper end opening, and the upper edge of the bag is folded back to the outside of the upper edge of the container when the number table is placed inside the container. The main topic is bags for interior use.

Hereinafter, this invention will be explained in detail according to the embodiments shown in the drawings.

The sheet constituting the container inner bag according to this invention is
It has a cross section as shown in the figure.

In the figure, 2 is kraft paper that provides toughness, moisture resistance, and shape retention to sheet 1, and 3 is aluminum foil that provides moisture resistance to sheet 1. This is made of adhesive thermoplastic resin on the top side of kraft paper 2. It is arranged through a layer 4 of some polyethylene.

5 is a polyethylene layer provided on the upper surface of the aluminum foil 3.

Here, the thickness of kraft paper 2 is aluminum foil 3 resin layer 4
, 5 is significantly larger than the respective wall thicknesses of .

FIG. 2 shows the unfolded state of the bag according to this invention.

In the figure, 6 is a pair of glue margins located inside from both side edges of the rectangular sheet 1 having a length L width and has a width d1, and 7 is located inside each of the pair of glue margins 6. This is a pair of side wall equivalent portions having a width and a width.

Here, the relationship to the width is a2=(p-2d,)/4.

Reference numeral 8 denotes a band-shaped portion located between a pair of side wall equivalent portions 7, 9 refers to a bottom wall-equivalent portion of a square located at the center of the length of the band-shaped portion 8 and has one side of 2×, and 10.11 refers to a band-shaped portion. These are the front wall equivalent portion and the rear wall equivalent portion located at both ends of the length of 8, respectively.

Next, the manufacturing process of the bag of this invention will be explained. First, the sheet 1 is placed with the polyethylene layer 5 facing upward.

The front wall equivalent part 10 and the rear wall equivalent part 11 are respectively erected perpendicularly to the horizontal bottom wall equivalent part 9, so that the seat 1 has a U-shaped longitudinal section.

Next, the side wall portion 7 is folded inward, and the adhesive portion 2 is folded at the center of the length to face each other, and then heat-sealed using a melt-sealing machine.

Finally, a pair of outwardly projecting right isosceles triangular tongues 12 are respectively glued to the side walls.

In this way, as shown in Figure 3, the bottom surface is 2×d on one side.
A rectangular parallelepiped bag having a square shape of 2 and a height of (L-2d2)/2 is formed.

FIG. 4 shows the state in which the container interior bag according to this invention is used.

In this example, a plurality of cuts 13 are made perpendicularly to the top opening of the bag.
is formed.

The bag is then placed inside an open drum 14, and the upper end is folded back to the outside of the upper opening of the drum 14.

In this state, paint and other liquid materials are put into this bag and stored in the open drum can 14.

Further, with the bag inside as described above, the top opening of the open drum 14 may be covered with a lid if necessary.

Note that the container interior bag according to this invention is not limited to a rectangular parallelepiped bag as in the embodiments, but may have a shape that roughly adapts to the shape of the bottomed cylindrical container.

This invention is based on the above, and one rectangular sheet 1 is made of kraft paper 2, aluminum foil 3 adhered to the top surface of kraft paper 2, and thermoplastic resin layer 5 provided on the top surface of aluminum foil 3. The material cost is low, and a bag with excellent toughness, moisture resistance, and shape retention can be obtained.

Moreover, the bag has the sheet 1 with the thermoplastic resin layer 5 inside.
is bent into a U-shaped longitudinal section, each side of the pair of opposing vertical walls is bent inward, and the opposite edges 6 of the sheet 1 are brought together and heat-sealed to form side walls. , a pair of outwardly protruding triangular tongues 12 formed on both sides of the horizontal wall are each folded up and affixed to the side wall, and the non-folded portion of the horizontal wall serves as the bottom wall. Therefore, there is no seam at all on the bottom wall of the bag, and the bottom of the side wall of the bag is reinforced by forming a double wall with the triangular tongue 12 affixed thereto, and the resulting seam is also reinforced by the triangular tongue 12. covered by.

Therefore, the bottom wall and the lower part of the side wall of the bag, which are subjected to the greatest load due to liquid injection, have a strong structure and there is no risk of rupture.

In addition, the container inner bag according to this invention is easy to manufacture, and
Since it is inexpensive, there is no cost loss even if the number table is placed in a container and used only once and then thrown away.

In order to store another new liquid substance in the container, it is sufficient to insert the liquid substance into another new container and put the liquid substance therein. Therefore, cleaning of the inside of the container can be omitted and work efficiency is significantly improved. I can do it.

Furthermore, since a plurality of vertical notches 13 are made in the top opening of the bag, the top edge of the bag can be folded back to the outside of the top edge of the container when the number table is placed inside a container. , so the bag is also supported by the upper edge of the container.

Therefore, when injecting liquid into the bag, the bag does not slip into the container, and the liquid can be injected without any problem.

[BRIEF DESCRIPTION OF THE DRAWINGS] The drawings show one embodiment of this invention, in which Fig. 1 is a partially enlarged sectional view of the sheet, Fig. 2 is a developed view of the bag, Fig. 3 is a perspective view of the bag, and Fig. 3 is a perspective view of the bag. FIG. 4 is a perspective view of the container showing the state of use. 1. Curved sheet, 2. Curved kraft paper, 3. Curved aluminum foil, 4. Curved adhesive resin layer, 5. Thermoplastic resin layer, 6. Curved glue margin, 7. ... Side wall equivalent part, 8 ... Band-shaped part, 9 ... Bottom wall equivalent part, 1o ... Front wall equivalent part, 11 ... Curved rear wall Equivalent part, 12... curved tongue part, 13... cut.

Claims (1)

[Scope of utility model registration request] A substantially rectangular bag that is placed inside a container such as a drum can,
A rectangular sheet 1 is made up of a kraft paper 2, an aluminum foil 3 adhered to the top surface of the kraft paper 2, and a thermoplastic resin layer 5 provided on the top surface of the aluminum foil 3, with the thermoplastic resin layer 5 inside. The sheet 1 is bent into a U-shape in longitudinal section, each side of a pair of opposing vertical walls is bent inward, and the opposite edges 6 of the sheet 1 are brought together and heat sealed to form a side wall. A pair of outwardly protruding triangular tongues 12 formed on both sides of the horizontal wall are folded up and affixed to the side walls, with the non-folded portion of the horizontal wall serving as the bottom wall, and the opening at the top end. A bag for lining containers such as drum cans, in which a plurality of notches 13 are made perpendicularly to the container, and the top edge of the bag is folded back to the outside of the top edge of the container when the number table is placed inside the container. .