JPH0519140U - Heavy oil bag for explosives - Google Patents

Abstract

(57) [Abstract] [Purpose] A heavy bag for sealing ammonium nitrate oil explosive with excellent openability [Composition] Parallel to and parallel to the above-mentioned end openings when at least one end opening is aligned and closed. A bag having a sealing portion that is bent with the width of the end portion facing inward and the sealing portion is (a) a bent step portion (5),
(B) a cutting tool (6) arranged along the bending step (5), and (c) an overtape (2) for covering and adhering the entire front and back surfaces of the sealing portion so as to sandwich them.
It is a heavy bag for ammonium nitrate oil explosive. [Effect] It has excellent openability and does not leach the oil agent or absorb external moisture.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a heavy bag for ammonium nitrate oil explosive.

[0002]

[Prior Art]

 Heavy bags for ammonium nitrate oil explosives are specified in detail in the Explosives Control Law. Regarding the material and structure, a film made of synthetic resin (limited to tubes without joints), processed paper coated with or pasted with synthetic resin, or Japanese Industrial Standards "Craft Paper Type 1" Use a bag of 5 layers or more made of kraft paper that conforms to the above, give oil resistance to the innermost layer of the bag, and water resistance to the outermost layer, and there is no risk of sparking due to friction or impact, and , It should be sealed with something that does not damage the packaging. Therefore, as the heavy bag for ammonium nitrate oil explosive, the same heavy bag has been used since it was first manufactured.

FIG. 10 is a plan view of a heavy bag for an ammonium nitrate oil explosive that has been conventionally used. The structure of this heavy bag is composed of a body part (1) of a heavy bag having a five-layered tubular structure and a sealing part at the open end (4) of the body part (1). In the body (1), a cylindrical film made of a copolymer of vinyl chloride and vinylidene chloride or a cylindrical film laminated with polyethylene and nylon is laminated on the innermost layer, and a polyethylene film is laminated on the craft paper as the outermost layer. It is made of processed paper, and the layers between them are made up of five layers of kraft paper. There are two sealing parts on the top and bottom. In each case, the open end (4) of the body part (1) of a heavy-duty bag with a five-layer tubular structure is flatly closed, and the open end ( The tape (4) is put over the tape (2) usually made of kraft paper, and the sewing thread (3) is sewn on the tape from above. The content of ammonium nitrate oil explosive, which is the content, is stored in the innermost tubular film of the body (1) and is taken out by loosening the sewing thread (3).

[0004]

[Problems to be Solved by the Invention] The conventional heavy bag for ammonium nitrate oil explosive has a problem in that the unsealing property is very poor because it is sewn by a sewing machine. Heavy bags are opened at the site of blasting, but sometimes they are not opened well.In that case, it is necessary to use unsuitable metal tools such as scissors and knives at the site of explosives handling, and for safety reasons. Not preferable. In addition, in the case of sewing with sewing machines, the oil agent of the ammonium nitrate oil explosive may penetrate into the sewing thread and vaporize, and there is also a problem that the bag strength is reduced if it penetrates into the overtape from the sewing thread. In addition, water infiltrates through the perforations or absorbs moisture, which may cause the ammonium nitrate oil explosive to solidify and deteriorate in quality.

[0005]

[Means for Solving the Problems]

 The object of the present invention is to solve the above-mentioned problems of heavy bags for ammonium nitrate oil explosives. That is, the present invention is directed to a bag body having a sealing portion that is folded with at least one end opening being aligned and closed, parallel to the end opening, and having a fixed width with the end opening inside. The sealing portion is (a) the folding step portion (5), (b) the cutting tool (6) arranged along the folding step portion (5), and (c) the entire front and back surfaces of the sealing portion. It is a heavy bag for ammonium nitrate oil explosive characterized by having an over tape (2) for covering and adhering as described above.

Hereinafter, the present invention will be described in detail. First, the configuration of the present invention will be described with reference to FIG. That is, the heavy bag of the present invention comprises the body (1) of the heavy bag having a tubular structure of 5 layers and the sealing portion (here, one sealing portion is shown), and the structure of the sealing portion. Is different from the conventional sewing machine sewn on the over tape (2), the end of the body (1) of the heavy bag is bent 2 or 3 times with a width of 1 to 4 cm, and it is overlapped by the bending. The step (6) that is placed along the bending step (5), which is formed between the portion that does not overlap and the portion that does not overlap, and the portion that overlaps by folding from the back surface to the front surface, are sandwiched. It consists of an over tape (2) that holds down the opening of the heavy bag by bonding. Regarding the method of adhering the over tape (2), it may be adhered by an adhesive or by heat sealing using a processed paper in which the resin is laminated on the over tape (2). Although the opening side sealing method that requires easy opening of the heavy bag has been described here, the sealing part at the other end may be the same as the above description, or the conventional sewing machine sewing method. Good, no particular limitation. In order to open this heavy bag, the overtape (2) can be broken along the bent step (5) by pulling the cutting tool (6) from its side end part, and after breaking, The contents can be taken out by unfolding the folded part and expanding the open end of the heavy bag.

Further, the body part (1) of the heavy bag used in the present invention does not use a new material in particular according to the regulations of the Explosives Control Law, but is made of a synthetic resin which has been conventionally used. A bag of 5 layers or more is used which is made of a film, a coated paper coated with a synthetic resin, or a glued paper, or a kraft paper conforming to the Japanese Industrial Standard "Kraft Paper No. 1". Next, the cutting tool (6) used in the present invention is constructed by providing an over tape (2), which serves to seal the end opening of the heavy bag, along the folding step (5). It is preferable to use a material having a tensile strength greater than the tear strength of the overtape (2) for cutting, and synthetic resin tape such as polyethylene or polypropylene or cotton thread is used.

Next, the over tape (2) used in the present invention should be opened by adhering the folded portion of the heavy bag, that is, the folded end difference portion (5) so as to sandwich it. It is a thing that suppresses and seals. The material of the overtape (2) may be any as long as it can adhere to the body part (1) of the heavy bag, and usually, kraft paper or processed paper obtained by laminating a synthetic resin film on kraft paper is used. It The sealing strength depends on the adhesive strength of this overtape (2) and the strength of the material. Therefore, to prevent unsealing during transportation and handling, two overtapes (2) should be stacked to increase the strength or to the surface. It is preferable to prevent a decrease in strength by applying waterproof treatment, for example, synthetic resin coating or laminating.

Further description will be given below with reference to the drawings. 2 and 3 are views showing a method of folding a heavy bag according to the present invention. As shown in FIG. 2, at least one of the end openings is folded in parallel with the opening end 4 with a width of 1 cm to 4 cm in a state of being aligned and closed in a plane. At this time, the reason for setting it to 1 cm or more is that since the heavy bag for ammonium oil explosive has a structure of 5 layers or more, bending it with a width of less than 1 cm causes a decrease in productivity. The reason why the width is set to 4 cm or less is that the cost becomes high even if a width larger than that is provided. Next, as shown in FIG. 3, the opening end (4) is placed inside and further bent.

FIG. 1 shows a state after the heavy bag is sealed. After bending 2 or 3 times, attach the over tape (2) from the opposite side of the bending to the bending surface with the cutting tool (6) so that the cutting tool (6) is located at the bending step (5). .. 4 to 6 are sectional views showing a state after sealing. FIG. 4 shows a case of bending twice, and FIGS. 5 and 6 show a case of bending three times. All are bent so that the open end (4) does not come to the outer surface. This is an opening for taking out the ammonium nitrate oil explosive even if the over tape (2) is cut by the cutting tool (6) at the bending step (5) when the opening end (4) comes to the outer surface. This is because it is difficult to open the end (4). Also, here, the bending length of the overtape (2) is drawn to be the same length on the front and back sides, but it is not necessary to make it the same. However, it is preferable to provide at least 1 cm or more in the body bonding surface (7) below the bending step (6). If it is less than 1 cm, the bag has a weak sealing strength, and if it is dropped during handling, it may be opened and spilled from the ammonium nitrate oil explosive. In addition, it is said that in the case of one-fold bending, the ammonium nitrate oil explosive reaches the open end (4) during transportation, weakens the adhesive strength of the overtape (2), and oil leaks out of the bag. This is because there is a problem, and even if it is bent four times or more, the effect of preventing leakage of the ammonium nitrate oil explosive remains the same, and conversely the cost increases.

FIG. 7 shows a case where the cutting tool (6) and the over tape (2) of FIG. 1 are longer than the width of the heavy bag and have the ears (8). The presence of the ears (8) makes it easy to hold when handling at the site of consumption, etc., and it is sealed by adhesion to prevent water from entering and absorbing moisture from the both sides of the heavy bag, especially when folded. It has the advantage that it can. At that time, if the ear portion (8) is 1 cm or more, it is easy to hold and can be adhered for sealing. It is preferably 3 to 5 cm.

FIG. 8 shows an adhesive surface (9) for sealing. The entire surface of the overtape (2) may be adhered, but it is not necessary to adhere it to the outermost end, and at least a part of both sides of the heavy bag of the ear (8) may be adhered in parallel to achieve sealing. As a result, it is possible to prevent the penetration of water and the solidification and deterioration of quality of the ammonium nitrate oil explosive due to moisture absorption. Figure 9 shows the outermost end of the overtape (2) with ears (8), but with cuts (10) on both sides along the cutting tool (6). By making the cut (10), it becomes easy to operate the cutting tool (6). The cut (10) is preferably at least 5 mm or more, more preferably 1 cm to 2 cm. In addition, it is preferable in operation that the cut (10) is not adhered. This is preferable because it is easy to operate by notching and not partially adhering even when the ear portion is not provided as shown in FIG.

[0013]

【Example】

 An example will be described below.

[0014]

Example 1 A film made of a copolymer of vinyl chloride and vinylidene chloride was used as the innermost layer, a processed paper obtained by laminating kraft paper on both sides of a polyethylene film was used as the outermost layer, and the other 5 layers using kraft paper. The film was used as the barrel (1). As the sealing method, the method shown in Fig. 1 was used. The folding width was 3 cm, and it was bent twice. The cutting tool (6) was made of polypropylene stretch tape with a strong strength of 9.5 kg, and the over tape (2) had a tear strength of 117 g and weft of 156 g. Two pieces of glue were used together. The width of the over tape (2) was 12 cm, and the over tape (2) was adhered with an adhesive so that the over tape (2) was sandwiched between the opposite side and the folded side by 6 cm. Ten such heavy bags were prepared and each one was opened by 10 workers at the blasting site. All 10 were able to open and had no need to use scissors.

Next, an ammonium nitrate oil explosive was placed in this heavy bag, and the strength of the bag was examined. The test was carried out according to the Japanese Industrial Standard "Craft Paper Bag Drop Test Method", but no bag breakage was observed even after dropping 10 times. Further, a load of 200 kg was applied on the bag and left for 30 days, but neither solidification nor exudation of the oil solution was observed.

[0016]

Example 2 Ten heavy bags similar to those of Example 1 were prepared except that the ears (8) were provided at both ends of the heavy bag. Ten heavy workers opened this heavy bag, one bag each. All 10 people could open the bag more easily than the bag of Example 1.

[0017]

Example 3 In the same heavy bag as in Example 2, 1 cm notches (10) were made above and below the cutting tool (6) at the end of the overtape (2). Ten workers were asked to perform an open test for each heavy bag. It was possible to open the bag by pulling the cutting tool (6) at the portion where the cut (10) was made, and all 10 persons could easily open the bag more than the bag of Example 2.

[0018]

[Comparative Example 1] As shown in Fig. 10, 10 bags of a heavy bag body (1) sewn with a sewing machine by applying an overtape (2) of kraft paper were prepared. When 10 workers opened it, two out of 10 could not untie the sewing thread and had to use scissors.

[0019]

[Effect of the device]

 The heavy bag of the present invention can be easily opened by pulling the cutting tool (6). In addition, no leaching of the oil solution was observed during storage in the warehouse, and the bag strength did not decrease. In addition, it does not absorb moisture from the outside and solidify.

[Brief description of drawings]

FIG. 1 shows a sealing method using a cutting tool and an over tape according to the present invention.

FIG. 2 illustrates a method of folding an end portion of a heavy bag according to the present invention.

FIG. 3 illustrates a method of folding an end portion of a heavy bag according to the present invention.

FIG. 4 is a cross-sectional view showing an example of the sealing portion of the present invention.

FIG. 5 is a cross-sectional view showing an example of the sealing portion of the present invention.

FIG. 6 is a sectional view showing an example of a sealing portion of the present invention.

FIG. 7 is an example of a sealing method having ears of the present invention.

FIG. 8 is an example of a bonding method for sealing according to the present invention.

FIG. 9 is an example in which a cut line is provided at an end portion on the overtape side of the present invention.

FIG. 10 shows a heavy-duty bag for an ammonium nitrate fuel oil explosive sewn by a conventional sewing machine.

[Explanation of symbols]

 1 Body 2 Overtape 3 Sewing Thread 4 Opening End 5 Bending Step 6 Cutting Tool 7 Body Bonding Surface 8 Ear 9 Bonding Surface 10 Cuts

Claims (3)

[Scope of utility model registration request] 1. A bag body having a sealing part which is parallel to the end opening and is folded with the end opening inside with the end opening in a state where at least one end opening is aligned and closed, The sealing part is sandwiched between (a) the bent step (5), (b) the cutting tool (6) arranged along the bent step (5), and (c) the entire front and back surfaces of the sealing part. A heavy bag for an ammonium nitrate oil explosive characterized by having an over tape (2) for covering and adhering. 2. The cutting tool (6) and the overtape (2) have ears (8) extending outward from both sides of the bag body, and a part of the ears (8). Is a bonded body of the cutting tool (6) and the overtape (8), and the heavy bag for an ammonium nitrate and oil explosive charge according to claim 1. 3. The heavy bag for an ammonium nitrate fuel oil explosive according to claim 2, wherein a part of the ear portion (8) has a cut (10) provided along the cutting tool (6).