JPH05262363A - Manufacture of plastic drum - Google Patents

Abstract

PURPOSE:To provide a plastic drum by which the resources can be effectively utilized, and which is convenient for washing by a method wherein an upper part of a discarded plastic drum is horizontally cut to form a main body and a lid, and an inner cylinder with an outer diameter which is the same as the inner diameter of the main body, is fitted in, and the upper edge of the inner cylinder is projected from the upper edge of the main body so that the lid can be fitted on. CONSTITUTION:An upper part of the body of a used plastic drum 11 is cut at a position which is approximately 5-15cm from the upper edge, and a drum main body 1 and lid 2 are formed. In the meantime, a cylindrical object 3 is made by cutting another used plastic drum 11 horizontally in the vicinities of the upper and lower edges, and the cylindrical object 3 is cut in the axial direction, and an inner cylinder 6 is formed by cutting a portion 7, which has a width of approximately 3.14 times of the drum body thickness, from the cut section. At this time, it is made in such a manner that when the cut ends of the inner cylinder 6 are joined, the inner cylinder 6 joined to the inner surface of the drum main body 1. Then, the inner cylinder 6 is fitted in the drum main body 1 and adhered. At this time, it is adjusted so that the inner cylinder 6 is projected by an appropriate length, which is suitable to fit a lid 2, from the upper end of the drum main body 1. The cut ends of the inner cylinder 6 are backed by an adhesive tape.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a plastic drum made from a used plastic drum.

[0002]

2. Description of the Related Art In recent years, the demand for plastic drums, which are 40% or less the weight of iron drums, are light, have good chemical resistance, and can be handled in the same manner as iron, has been increasing. As shown in FIG. 5, the plastic drum has almost the same size and shape as the conventional iron drum. Plastic drums can be handled in the same way as iron drums, but they are made of resin and have poor heat resistance (polyethylene). After using them once, hot water vapor is blown through the narrow holes in the lid to clean them. It is inferior to iron drums in that it cannot be dried with hot air. For this reason, many used plastic drums cannot be filled with another substance and reused, and most of the plastic drums are currently discarded as waste. The present situation is not only a waste of resources, but the large volume of an empty plastic drum significantly lowers the efficiency of waste disposal, which is also a problem from the viewpoint of waste disposal.

[0003]

SUMMARY OF THE INVENTION The present invention uses such a waste drum as a raw material to manufacture a plastic drum which is convenient for cleaning, to effectively utilize resources, and to solve the problem of waste treatment. The purpose is to resolve.

[0004]

As a result of earnest studies to achieve the above object, the present inventor first manufactured one plastic drum by using two used plastic drums. A method has been conceived, and based on this, methods have been conceived of for manufacturing various forms of plastic drums. That is, the present invention comprises the inventions of the following items. (1) The upper part of the plastic drum is horizontally cut off, an inner cylinder having an outer diameter matching the inner diameter of the drum is fitted into the remaining drum body, and the upper edge of the inner cylinder is projected from the upper edge of the drum body. Then, the lid part is fitted to the protruding part of the inner cylinder. (2) The method for producing a plastic drum according to item 1, wherein the inner cylinder is a bottomed container, and the bottom of the inner cylinder container is in contact with the bottom of the drum body. (3) The inner cylinder cuts open a cylindrical object obtained by horizontally separating the upper part and the lower part of the same drum, and removes a width of about 3.14 times the drum body thickness from the cut edge. 2. The method for producing a plastic drum according to claim 1, wherein the circumference is reduced to form an inner cylinder having an inner diameter of the original drum as an outer diameter.

(4) The method for producing a plastic drum according to the above item 1, 2 or 3, wherein the lid is an upper part of the drum separated from the upper part of the body. (5) The method for producing a plastic drum according to item 4 or 5, wherein the cuts of the inner cylinder are reinforced with an adhesive or an adhesive tape. (6) The upper part of the body of the plastic drum is horizontally separated, the separated portion is used as a lid, and an inner cylinder having an outer diameter that matches the inner diameter of the lid is fitted and fixed to the lid, A method for manufacturing a plastic drum, characterized in that a lower edge is projected from a lower edge of the lid portion, and the protruding portion of the inner cylinder is inserted into and fitted into the inner diameter of the body of the drum body.

A used plastic drum used as a raw material in the production method of the present invention has, for example, as shown in FIG. 5, a height of 91 cm and a diameter of 58 cm, which are almost the same as those of an ordinary iron drum containing 200 liters. It is made of a plastic resin having a thickness of 3.6 mm, and is currently used as a resin material because of its high strength and high density polyethylene. This weight is 8 kg, which is about 40% less than 22 kg made of iron. As a typical mode of the present invention, a method of manufacturing one plastic drum from two plastic drums by applying the configuration of the third item to the fourth item will be described in more detail with reference to process charts of examples. ..

FIG. 1 is a process explanatory view of an embodiment of the manufacturing method of the present invention. First, in step A, the upper part of the plastic drum 11 is horizontally cut to form the drum body 1 and the lid. Separate into 2. It is preferable that the cutting position is about 5 to 15 cm from the upper edge of the drum. Next, as shown in the step B, the cylinder 3 is horizontally cut at a position as close as possible to the upper edge and the lower edge of the body of another plastic drum, and the cylindrical object 3 is removed, while the upper surface 4 and the bottom 5 are discarded. To do. next,
The side surface of the cylindrical object 3 is cut vertically or obliquely, and the lateral width is multiplied by 3.14 of the drum thickness of 3.6 mm to obtain a slender cut-off portion 7 having a width of about 11 mm. Then, the inner cylinder 6 is manufactured. Next, as shown in step C, the inner cylinder 6
Make a cylindrical shape by closely adhering the cut end of the
It is inserted along the inner surface of the drum body 1 manufactured in. When the cut end of the inner cylinder 6 is brought into close contact, the outer diameter of the inner cylinder 6 exactly matches the inner diameter of the drum body 1. In this way, when the lower edge of the inner cylinder 6 is inserted to the bottom of the drum body 1, the upper edge of the inner cylinder 6 projects from the upper edge of the drum body 1 as shown in step C. The length of this protruding width can be adjusted by the position of the cutting in the process A and the height of the tubular member 3 manufactured in the process B.

Finally, the lid 2 separated in step A can be covered with the protruding portion of the inner cylinder 6 to seal the drum.
In this case, since the separated portion of the inner cylinder 6 is fixed, the seam can be reinforced by backing it with an adhesive tape.
Further, an adhesive is applied to the outside of the seam portion or a part or the whole of the outer surface of the inner cylinder 6 so that the inner cylinder 6 is attached to the inner surface of the drum body.
Can be fixed with an adhesive. Particularly, the mating portion on the protruding portion of the inner cylinder 6 is separated from the drum main body 1 and protrudes, so that the strength is weakened. To reinforce this portion, for example, a separately prepared grooved metal ring can be fitted to the upper edge of the protruding portion. The metal ring is a ring made of a thin metal plate having a U-shaped cross section, and the upper edge of the inner cylinder can be fitted in the U-shaped groove. In this case, since the metal ring has a thin plate shape, the outer diameter of the protruding portion hardly changes, so that this reinforcing method does not hinder the fitting to the lid. Further, it is also possible to fix only the joint portion of the projecting portion by a lining or a stapler method.

As an aspect of the manufacturing method of the present invention, there is a manufacturing method in which the inner cylinder 6 is fixed to the lid portion 2 and is inserted into the drum body 1 in the above step. In this case, the inner cylinder 6 can be further divided into 3 to 5 parts and fixed to the lid part 2. According to this method, it is possible to manufacture as many drums as the number of divided inner cylinders from two used drums. Further, in the manufacturing method of the above-described two aspects of the present invention, instead of the inner cylinder 6, a separately manufactured inner cylinder having no notch may be prepared and used. This inner cylinder can be newly manufactured by molding with the outer diameter matched with the inner diameter of the drum, and has an unbroken cylindrical shape, which is advantageous in terms of strength. In this embodiment, one regenerated drum can be manufactured by using a new inner cylinder as a raw material for one used drum.

When this separately manufactured inner cylinder is used, instead of this inner cylinder, a bottomed trough-shaped member can be fitted inside the drum body. When such a bottomed trough-shaped inner cylinder is used, it is possible to completely clean the previously filled substance when cleaning the reclaimed drum after use.
It is convenient when used as a drum for chemicals.
As another aspect of the present invention, instead of the lid portion 2 of the above-described three aspects, a separately manufactured one or a one having a processed upper surface of a separated lid can be used. For example, one having a lid surface with an insertion port 8 as shown in the plan view of FIG. 2 can be attached. The reproduction drum provided with such a lid can be effectively used as a recycling box. Depending on the shape of the charging port shown in FIG. 2, it is possible to separate dust and cans to be charged. For example, the left one in FIG. 2 can be used as a recycling box for cans, the middle one can be used as a general-purpose type, and the right one can be used as paper. The recycling box is durable and does not rust, so it is durable and can be used for a long time.

When using the lid portion separated from the original drum material, it is better to form a hole at the insertion hole portion of the lid from the beginning to improve the appearance. According to the present invention, the body portion is once separated and then re-fitted. Therefore, as compared with the drum body which is not regenerated, the body portion is continuously integrated. It is desirable to strengthen. The simplest strengthening method can be carried out by sticking an adhesive tape 9 formed by applying an adhesive having a strong adhesive force to a durable plastic tape as shown in FIG. 3 at the joint between the lid portion and the drum body. .. As another method, as shown in FIG. 4, it is convenient to provide holes on both sides of the upper edge of the drum body, pass the polypropylene band 10 or the like through them, and tighten and fix them by a known method. When this band is passed between the inner cylinder and the outer case, the contents will not leak from the hole. These fixing methods are convenient in that after the contents are taken out, the lid can be removed again to wash and dry the inside of the drum at a low temperature.

[0012]

According to the manufacturing method of the present invention, a drum whose lid can be removed from a used plastic drum can be manufactured. Therefore, the drum manufactured according to the present invention can be washed at low temperature and dried. Therefore, it has the advantage that it can be reused many times. Further, since the contents can be taken out by removing the lid portion, there is an advantage that it can be used as a storage drum for a solid material having a large size like a recycle box. In addition to the above advantages, the manufacturing method of the present invention is effective in that it can solve the problems of effective use of resources and waste disposal.

[Brief description of drawings]

FIG. 1 is an explanatory view of an embodiment of one aspect of the manufacturing method of the present invention.

FIG. 2 is a plan view of an embodiment of a lid portion used in one aspect of the present invention.

FIG. 3 is a perspective view showing a lid fixing method using an adhesive tape.

FIG. 4 is a perspective view showing a lid fixing method using a band tape.

FIG. 5 is a side view and a top view of a plastic drum used as a raw material of the present invention.

[Explanation of symbols]

 1 Drum Main Body 2 Lid Part 3 Cylindrical Object 4 Top Part 5 Bottom Part 6 Inner Cylinder 7 Cut-off Part 8 Input Port 9 Adhesive Tape 10 Fixing Band 11 Plastic Drum for Raw Material

Claims (6)

[Claims] 1. An upper cylinder of a plastic drum is horizontally cut off, an inner cylinder having an outer diameter matching the inner diameter of the drum is fitted into the remaining drum body, and the upper edge of the inner cylinder is the upper edge of the drum body. A method for manufacturing a plastic drum, characterized in that the lid is fitted to the protruding portion of the inner cylinder. 2. The method for producing a plastic drum according to claim 1, wherein the inner cylinder is a bottomed container, and the bottom of the inner cylinder is in contact with the bottom of the drum body. 3. A cylindrical body obtained by horizontally separating the upper part and the lower part of the same drum from another inner drum is cut open, and a width of about 3.14 times the drum body thickness is deleted from the cut edge. 2. The method for producing a plastic drum according to claim 1, wherein the inner circumference of the drum is reduced so that the inner diameter of the original drum is the outer diameter. 4. The method for producing a plastic drum according to claim 1, 2 or 3, wherein the lid is an upper part of the drum separated from the upper part of the body. 5. The method for manufacturing a plastic drum according to claim 4, wherein the cut line of the inner cylinder is reinforced with an adhesive or an adhesive tape. 6. The upper part of the body of the plastic drum is horizontally separated, and the separated part is a lid, and an inner cylinder having an outer diameter matching the inner diameter of the lid is fitted and fixed to the lid.
A method for manufacturing a plastic drum, characterized in that the lower edge of the inner cylinder is projected from the lower edge of the lid, and the protruding portion of the inner cylinder is inserted into and fitted into the inner diameter of the body of the drum body.