TWI469898B - Resin container, combination container, and method for manufacturing the resin container - Google Patents

Description

Resin container, composite container, and resin container manufacturing method Field of invention

The present invention relates to a resin container such as a resin can made of a polyethylene material or the like, a composite container in which the inner container is filled in the outer container, and a method of manufacturing the resin container.

Background of the invention

For example, there is a can made of a resin such as a polyethylene tub and a plastic tub which can be blow molded using a thermoplastic resin material such as a polyethylene material. The resin cans described above are superior in chemical resistance and corrosion resistance to steel cans, and are often used as containers for containing chemical liquids such as semiconductors and liquid crystals. In addition, examples of the above chemical liquids are in the semiconductor category such as CMP slurry, photoresist, developer, etching solution, cleaning solution, etc., and in the liquid crystal category, it is a photoresist, a color photoresist, a color filter material, and the like. .

The above-mentioned resin cans are various in size, but the capacity of large ones is also such as 200 liters. When the large-sized resin can is discharged from the container, it is difficult to incline the can itself and discharge the container. Therefore, the discharge method is a method in which a discharge pipe is inserted into a tank from a mouth portion formed in an opening portion of a top plate of the can body, and discharged through the discharge pipe, and the container is sucked out by the pump. The pumping method, or injecting nitrogen gas into the tank, pressurizes the tank to a pressure of about 5 to 200 kPa to pressurize the container.

[Advanced technical literature] [Non-patent literature]

[Non-patent document 1] Sekisui molding industry Co., Ltd. catalogue "SEKISUI POLY-DRUM", (issued in September 2006)

[Non-patent Document 2] "Synthetic Jerry Can polikon plastic drum composite container", (formed October, 2007)

In either of the above-described pumping method and the pressurizing method, the discharge pipe is used for discharging the container. At this time, in a state where there is no gap between the suction port of the discharge pipe and the inner surface of the bottom of the resin can, the suction port is in a state of being blocked by the bottom inner surface, so that the discharge operation cannot be performed. Therefore, since a small gap is provided between the suction port and the bottom inner surface, the discharge pipe 2 having a shorter depth from the mouth portion to the bottom plate can be used. At this time, however, when the container is discharged, as shown in Fig. 16, at the bottom of the resin can 1 will be filled with the gap 3, and the entire amount of the container 3 will not be discharged. In addition, the pumping method will also inject a nitrogen gas or the like into the tank to avoid a negative pressure in the tank accompanying the discharge of the container 3.

Further, in particular, as described in Fig. 16, in order to secure the rigidity when accommodating the container 3, the bottom plate 4 of the resin can is formed with its central portion bulging toward the inside of the can. Convex or arc-shaped shape 4a. Further, in Fig. 16, a resin can 1 in which a convex shape 4a is formed in two stages from the center of the outer circumference of the can is shown. Therefore, at the end of the discharge of the container, the container 3 is collected on the peripheral portion 4b of the bottom plate 4, and the container 3 having at least the height of the protruding or bulging shape 4a remains in the can.

At this time, by using the discharge pipe 2 having a depth which is longer than the depth from the mouth to the bottom plate, the residual amount can be reduced when the tip end of the discharge pipe 2 is accidentally placed on the side of the peripheral portion 4b where the container 3 is collected. However, considering the conditions of the above-described method of attaching the mouth portion and the hardness of the discharge tube 2 by the discharge pipe 2, the tip end of the discharge pipe 2 is disposed in the abnormal state on the side of the remaining container, and the discharge is simply used. The idea of using tube 2 is not a good solution to the problem.

Further, the above-described pressurization method increases the internal pressure of the resin can 1 so that, as shown in Fig. 17, the bottom plate 4 in which the container 3 remains at the time of discharge is also bulged outward, and is formed on the bottom plate 4. Concave portion 4c. Therefore, the pressurization method causes the container 3 to remain in the recessed portion 4c as well, and generally, the amount of the residual material in the tank of the pressurized method is larger than that of the pumping method. Therefore, the user who uses the pressurized resin can be designed to reduce the amount of residue on the side of the container discharge device connected to the resin can 1 is a problem.

In addition, the price of the chemical liquid used in the above-mentioned semiconductor category and liquid crystal category is extremely high, and the cost of the surface is considered, and the resin can user is desirably reducing the amount of residue. Therefore, users of resin cans strongly urge bottle manufacturers to reduce the amount of residue.

Furthermore, with the recent emphasis on resources and the environment, the recycling requirements for used resin cans have also increased. When the above-mentioned resin can is recovered, the residue in the can is a useless item, and the waste liquid must be treated to generate a treatment cost. Therefore, from the above point, it is also required to reduce the amount of residue.

Further, the resin can is formed by blow molding as described above, and a mold line (PL) is formed on the inner surface of the can along a straight line of a pair of molds, and is generated along the above-mentioned points. A thick piece (protrusion) formed by projecting a resin material toward the inside of the can. Therefore, when the residual amount of the container 3 is reduced by the above-mentioned thick block, the state in which the container 3 is divided into two is also generated. On the other hand, since the discharge pipe is one, the problem that only the one-side container 3 divided into two parts can be discharged is also generated. The above-mentioned resin cans also have a special structure and the necessity of reducing the amount of residue. Moreover, the height of the above-mentioned thick block is proportional to the thickness of the resin can. Therefore, a large resin can having a large amount of content of 100 to 200 liters will increase the necessity of the above-described reduction in the amount of residue caused by the structure.

The present invention has been made in view of the above problems and requirements, and an object thereof is to provide a resin container and a composite container which can reduce the residual amount in a container of a container, and a method for producing the resin container.

In order to achieve the above object, the constitution of the present invention is as follows.

That is, the resin container according to the first aspect of the present invention can be produced by blowing a thermoplastic resin with a pair of molds, and can discharge the contents through the discharge tube, and the discharge tube is formed from the mouth formed on the top plate. Inserted into the container, the resin container includes a residual amount reducing convex portion which is formed in a convex shape on the bottom plate of the resin container toward the inside of the container, and the discharge tube can be oriented to reduce the above-mentioned Further, the residual amount reduction convex portion includes a position inclined surface corresponding to at least a right side of the mouth portion and abutting against a front end of the discharge tube, and The front end can be guided toward the residual contents side of the container.

Further, the residual container may be located at a peripheral portion of the bottom plate, the inclined surface may be formed on the entire circumference of the bottom plate, and the remaining amount reducing convex portion may extend to a central portion of the bottom plate, and the central portion may be A flat surface is formed.

Further, the residual container may be located at a peripheral portion of the bottom plate or a central portion of the bottom plate, and the inclined surface and the remaining amount reducing convex portion may be formed only at positions corresponding to the right side of the mouth portion.

Further, the remaining container may be located at a central portion of the bottom plate, and the inclined surface may be formed on the entire circumference of the bottom plate, and a central portion of the bottom plate may be formed in a concave shape with respect to the remaining amount reducing convex portion.

Further, the remaining amount reducing convex portion may have a position control portion to form an inverted U shape, and the position regulating portion may position the leading end of the discharge pipe to a parting mold formed on the bottom plate by the blow molding. Near the line.

Further, the residual amount reducing convex portion may include a central protruding portion extending along a parting line formed on the bottom plate by the blow molding.

Further, the bottom plate may have a non-protruding field which is a portion of the protrusion formed on the parting line on the bottom plate by the blow molding, and may be present for the remaining container, and the protrusion is not provided.

Further, the composite container according to the second aspect of the present invention has an inner container and an outer container which can be formed by blowing a thermoplastic resin by a mold and can accommodate a container which is rigid. a material larger than the above-mentioned inner container and capable of loading the inner container into the inner side, the composite container being detachable by being inserted into the discharge tube in the inner container from the mouth of the outer container and the inner container In the above-mentioned container, the inner container includes a residual amount reducing convex portion which is formed in a convex shape on the bottom plate of the inner container toward the inner side of the container, and has an inclined surface to allow the discharge tube Orienting to reduce the residual amount of the above-mentioned container, and the inclined surface position is at least directly below the mouth portion, and is in contact with the front end of the discharge tube, and may face the residual container side in the inner container Guide the above-mentioned apex.

Further, the resin container according to the third aspect of the present invention can be produced by blow molding a thermoplastic resin by a pair of molds, and can discharge the contents through the discharge tube, and the discharge tube is formed from the mouth portion formed on the top plate. Inserting into the container; the bottom plate of the resin container has a non-protruding field, and the non-protruding field is in a protrusion formed on the parting line on the bottom plate by the above-mentioned blow molding, and a portion where the remaining contents in the container are present Without the above mentioned protrusions.

Further, the resin container according to the fourth aspect of the present invention can be produced by blow molding a thermoplastic resin by a pair of molds, and can discharge the contents through the discharge tube, and the discharge tube is formed from the mouth portion formed on the top plate. The bottom plate of the resin container has a liquid collecting slope on a peripheral portion of the bottom plate, and the liquid collecting slope is inclined downward toward a portion directly below the mouth portion.

In the above fourth aspect, the bottom plate may further have a non-protrusion field, and the non-protrusion field is formed in a protrusion formed on the parting line on the bottom plate by the blowing, and the residual container in the container may exist. Partly, there is no such protrusion.

Further, in the fourth aspect, the residual amount reducing convex portion may be further formed in a convex shape on the bottom plate toward the inside of the container, and the discharge tube may be oriented to reduce the above In addition, the residual amount reducing convex portion includes a liquid collecting inclined surface, and the liquid collecting inclined surface position corresponds to at least the right side of the mouth portion, and is adjacent to the front end of the discharge pipe. The front end can be guided to the side of the residual container in the container.

Further, in the method for producing a resin container according to a fifth aspect of the present invention, the resin container can be produced by blowing a thermoplastic resin with a pair of molds, and can discharge the container through the discharge tube, and the discharge tube can be discharged. The resin container is inserted into the container from the mouth portion formed in the top plate. The resin container is formed in the resin container by the blow molding, and the thermoplastic resin is formed in the resin by the blow molding before curing. The residual contents in the container in the protrusions on the parting line on the bottom plate of the container may be partially crushed to form a non-protruding field without the above protrusions.

Further, in the method for producing a resin container according to a sixth aspect of the present invention, the resin container can be produced by blowing a thermoplastic resin with a pair of molds, and can discharge the container through the discharge tube, and the discharge tube can be discharged. The resin container is inserted into the container from the mouth portion formed in the top plate, and the resin container is produced by the above-mentioned resin container by the above-mentioned blow molding, and the peripheral portion of the bottom plate of the resin container before the thermoplastic resin is cured. A liquid collecting slope is formed in a state in which the portion directly below the mouth portion is inclined downward.

According to the resin container of the first aspect, the remaining amount reducing convex portion is provided on the bottom plate, and the discharge tube inserted from the mouth of the resin container can be guided toward the remaining container side of the bottom plate of the resin container. The apex. Therefore, the amount of residue in the container of the container can be reduced compared with the prior art.

According to the composite container of the second aspect described above, the inner container has a convex portion for reducing the amount of residual amount on the bottom plate. Therefore, the leading end of the discharge tube inserted from the mouth can be guided toward the residual container side of the bottom plate of the inner container contained in the composite container. Therefore, the amount of residue in the container of the container can be reduced compared with the prior art.

According to the resin container of the third aspect described above and the method for producing the resin container of the fifth aspect, the projections on the parting line are provided with non-protruding fields, so that the residual contents in the container can be placed on the peripheral portion of the bottom plate. It is not divided into two parts due to the protrusion on the parting line. Therefore, the residual contents of the peripheral portion can be discharged by one discharge pipe, and the residual amount in the container of the container can be reduced compared with the prior art.

Further, according to the resin container of the fourth aspect and the method of manufacturing the resin container according to the sixth aspect, the bottom plate is provided with an inclined surface in which the portion directly under the mouth portion is inclined downward, so that the peripheral portion of the bottom plate The residual contents will collect in the portion directly below the mouth, that is, the portion where the leading end of the discharge tube is located. Therefore, the amount of residue in the container of the container can be reduced compared with the prior art.

Simple illustration

Fig. 1 is a cross-sectional view showing a resin container according to a first embodiment of the present invention.

Fig. 2 is a perspective view showing a convex portion for reducing a residual amount formed on a bottom plate of a resin container shown in Fig. 1.

Fig. 3 is a cross-sectional view showing a modification of one of the resin containers shown in Fig. 1.

Fig. 4A is a view showing the action of the convex portion for reducing the residual amount formed on the bottom plate of the resin container shown in Fig. 1.

Fig. 4B is a view showing the action of the convex portion for reducing the residual amount formed on the bottom plate of the resin container shown in Fig. 1.

Fig. 4C is a view showing the action of the convex portion for reducing the amount of the residue formed on the bottom plate of the resin container shown in Fig. 1.

Fig. 5A is a perspective view showing a modification of one of the convex portions for reducing the amount of the residue formed on the bottom plate of the resin container shown in Fig. 1.

Fig. 5B is a perspective view showing another modification of the convex portion for reducing the amount of the residue formed on the bottom plate of the resin container shown in Fig. 1.

Fig. 6 is a perspective view showing another modification of the residual portion for reducing the amount of the residue formed on the bottom plate of the resin container shown in Fig. 1.

Fig. 7 is a cross-sectional view showing a resin container according to a second embodiment of the present invention.

Fig. 8 is a cross-sectional view showing a modification of the resin container of the second embodiment shown in Fig. 7.

Fig. 9A is a perspective view showing a state in which the resin container shown in Fig. 1 is separated by the protrusion of the parting line and the remaining contents are separated.

Fig. 9B is a perspective view showing the bottom plate of the resin container according to the third embodiment of the present invention.

Figure 10 is a cross-sectional view showing a composite container of a fourth embodiment of the present invention.

Fig. 11A is a perspective view showing a bottom plate of a resin container according to a fifth embodiment of the present invention.

Fig. 11B is a perspective view showing a modification of the bottom plate of the resin container shown in Fig. 11A.

Fig. 12 is a view showing a method of producing a non-protrusion field of a resin container shown in Fig. 11A.

Fig. 13A is a perspective view showing a bottom plate of a resin container according to a fifth embodiment of the present invention.

Fig. 13B is a cross-sectional view of the A-A portion shown in Fig. 13A.

Fig. 13C is a perspective view showing a bottom plate of a modified example of the resin container shown in Fig. 13A.

Fig. 14 is a perspective view showing a mold used for the production of the resin container shown in Fig. 13A.

Fig. 15 is a perspective view showing a bottom plate of a resin container in which the fifth embodiment and the sixth embodiment of the present invention are combined.

Figure 16 is a cross-sectional view of a conventional resin canister showing the pumping method.

Figure 17 is a cross-sectional view of a conventional resin canister showing the manner of pressurization.

Form for implementing the invention

Hereinafter, the resin container and the composite container according to the examples of the present invention and the method for producing the resin container described above will be described with reference to the drawings. In the drawings, the same or similar components are denoted by the same reference numerals. Further, the composite container corresponds to a container in which a resin-made inner container is filled in a container having a rigidity larger than that of the inner container.

First embodiment:

Fig. 1 shows a resin can 101 of the present embodiment. Here, the resin can 101 corresponds to an example of a resin container. Further, the resin container is not limited to a cylindrical shape like the resin can 101, and may be, for example, a square shape, and the shape thereof is not limited.

The resin drum can 101 is made of a thermoplastic resin material such as a polyethylene material by a pair of molds, similarly to the above-described conventional resin drum 1 . In addition, since the blow molding is performed, a linear parting line (PL) 107 that divides the resin cans 101 into two in the longitudinal direction and that corresponds to the joint portion of the pair of molds is formed on the inner surface of the can (second) Figure). The parting line 107 is formed with a convex thick piece along the parting line 107 on the inside of the can as compared with the inner surface of the can other than the parting line 107.

Further, as described with reference to Fig. 16, the bottom plate 4 of the conventional resin can 1 is formed to ensure rigidity when accommodating the contents, and is formed in a central portion thereof to be convex or arc-shaped toward the inside of the can. Shape 4a. As shown in Fig. 1, the bottom plate 104 of the resin can 101 of the present embodiment is also the same, and the central portion of the bottom plate is formed into a convex or arc-shaped shape 104a which is bulged toward the can inner side 101a.

In the resin can barrel 101 of the present embodiment, in addition to the shape 104a formed on the bottom plate 104, the residual amount reducing convex portion 110 which is one of the characteristic components of the resin can 101 described above is formed. Hereinafter, the residual amount reducing convex portion 110 will be described in detail.

The top plate 105 of the resin can 10 is formed into a mouth portion 106a, 106b at two locations along the diameter direction of the top plate 105, similarly to the conventional resin can 1 . The mouth portions 106a and 106b are openings for the top plate 105 for receiving and discharging the contents, and when the discharge tube 102 is used for discharging the contents, one of the mouth portions 106a and 106b is as shown in Fig. 1. The discharge pipe 102 is inserted into the mouth portion 106a, for example, and the other is installed with a nitrogen injection pipe. Further, the mouth portions 106a and 106b have a structure in which the can inner side 101a can be kept in an airtight state. Further, the resin can drum 101 of the present embodiment is the same as the conventional method, and the above-described drawing method or pressurizing method is employed as the discharging method using the container for discharging the tube 102. Further, both of the pair of nozzle portions 106a and 106b may be attached to both the discharge pipe 102 and the nitrogen injection pipe. At this time, the mouth of the other side is sealed.

Further, the mouth portions 106a and 106b are located at the joint portion of the pair of molds. Therefore, the mouth portions 106a, 106b are located on the parting line 107 described above.

The discharge pipe 102 is made of a resin in the present embodiment and has a flexible pipe body. Further, the discharge pipe 102 may have flexibility at least at the tip end portion, and may not be made of a resin material as a whole or may not have flexibility as a whole.

The residual amount reducing convex portion 110 is located on the bottom plate 104, and corresponds to the position directly below the opening portion (hereinafter referred to as "106a" in the first drawing for convenience of explanation). As shown in Fig. 2, it is formed in a convex shape toward a can inner side 101a on a part of the bottom plate 104. In the second embodiment, the two portions of the residual amount reducing convex portion 110 are formed on the bottom plate 104 in correspondence with the mouth portions 106a and 106b. However, at least the mouth portion 106a into which the discharge tube 102 is inserted is formed to form one. The residual amount reducing convex portion 110 may be used.

In addition, the residual amount reducing convex portion 110 shown in Fig. 2 and the residual amount reducing convex portion 118 shown in Fig. 5A and the residual amount reducing convex portion 119 shown in Fig. 5B will be divided into points. The mold line 107 is formed into a shape that is bilaterally symmetrical, but is not limited thereto, and may be formed in a left-right asymmetric shape.

The above-described residual amount reducing convex portion 110 includes an inclined surface 111. The inclined surface 111 is in contact with the tip end 102a of the discharge pipe 102 inserted through the mouth portion 106a, and can guide the inclined surface of the tip end 102a toward the remaining container 3 side in the can. The inclined surface 111 is disposed so as to guide the discharge pipe 102 toward the peripheral edge portion 104b as shown in Fig. 1 before the discharge of the container is completed, for example, when the residual container 3 is collected on the peripheral portion 104b side of the bottom plate 104. The tip 102a. Further, the peripheral portion 104b corresponds to a portion of the bottom plate 104 other than the above-described bulged shape 104a.

As described above, when the accommodating liquid is discharged by the above-described pressurization method, the central portion 104c of the bottom plate 104 may be bulged toward the outside of the can and may be convex, and the residual accommodating member 3 may be gathered on the central portion 104c side. . At this time, as shown in FIG. 3, the inclined surface 111 is disposed to guide the tip end 102a of the discharge pipe 102 toward the center portion 104c side.

Further, before the discharge of the container is completed, the residual container 3 will be collected on the side of the peripheral portion 104b or the side of the central portion 104c, and can be predicted in advance. In other words, when the drawing method is used, it is collected on the side of the peripheral portion 104b, and when the pressing method is employed, it can be predicted based on the form, size, and the like of the shape 4a of the bottom plate 104 and the pressing pressure. Therefore, the set position of the inclined surface 111 can be designed.

The guiding direction of the leading end 102a of the discharge pipe 102 toward the peripheral portion 104b side or the central portion 104c side of the bottom plate 104 can be determined by the installation position of the inclined surface 111. That is, as described above, the inclined surface 111 is provided directly below the mouth portion 106a into which the discharge pipe 102 is inserted, and the discharge pipe 102 passing through the mouth portion 106a is lowered into the tank along a vertical line or a slightly vertical line. Therefore, when the tip end 102a of the discharge pipe 102 is to be oriented toward the peripheral edge portion 104b side of the bottom plate 104, the topmost portion 112 of the remaining amount reducing convex portion 110 is positioned lower than the discharge pipe 102 as shown in Fig. 4A. 102b may be located at the side of the central portion 104c. Further, when the tip end 102a of the discharge pipe 102 is to be oriented toward the center portion 104c side of the bottom plate 104, as shown in Fig. 3, the topmost portion 112 is located closer to the peripheral portion 104b side of the bottom plate 104 than the lowering position 102b. Just fine. In this way, the guiding direction of the discharge pipe 102 can be designed.

One of the shapes of the residual amount reducing convex portion 110 is a shape shown in FIG. 2, and the inclined surface 111 and the topmost portion 112 are curved and extended in the circumferential direction of the bottom plate 104. Further, in the embodiment of the residual amount reducing convex portion 110 shown in Fig. 2, the length L needs to be at least about 40 mm. When the length L is smaller than this value, the tip end 102a of the discharge pipe 102 may not be properly oriented toward the remaining container 3 side. Further, the height H of the bottommost surface to the topmost portion 112 of the bottom plate 104 is about 6 to 50 mm. When the height H is less than 6 mm, the tip end 102a of the discharge pipe 102 may not be properly oriented toward the remaining container 3 side, so that it is not suitable, and when it is larger than 50 mm, the shape of the residual amount reducing convex portion 110 is increased. In the case of blow molding, the moldability of the convex portion 110 for the residual amount is detrimental, and problems such as a decrease in the basic strength of the resin can 101 may occur, which is not applicable.

Further, the angle of the inclined surface 111 is about 10 to about 80 degrees with respect to the horizontal portion of the bottom plate 104, and preferably about 45 to 60 degrees. The inclined surface 111 has an inclination angle of about 10 degrees to about 80 degrees, so that the tip end 102a of the discharge pipe 102 can be more reliably directed toward the remaining container 3 side.

Further, the shape of the residual amount reducing convex portion 110 is not limited to that shown in Fig. 2 . For example, the shape of the residual amount reducing convex portion 117 shown in FIG. 5A and the residual amount reducing convex portion 118 shown in FIG. 5B may be employed.

The residual amount reducing convex portion 117 in Fig. 5A has a C-shaped or inverted U-shaped planar shape to arrange the tip end 102a of the discharge pipe 102 in the vicinity of the parting line 107. In other words, the residual amount reducing convex portion 117 includes position regulating portions 117a and 117b that can position the tip end 102a of the discharge pipe 102 in the vicinity of the parting line 107.

When the leading end 102a of the discharge pipe 102 is oriented toward the center portion 104c side of the bottom plate 104, the position regulating portions 117a and 117b are opposite to the case of Fig. 5A, and are oriented toward the center portion 104c.

The residual amount reducing convex portion 118 in Fig. 5B includes a central protruding portion 118a extending along the parting line 107, and the leading end 102a of the discharge pipe 102 is disposed to avoid the parting line 107.

Further, in the form in which the two residual amount reducing convex portions 110 are formed on the bottom plate 104 in correspondence with the mouth portions 106a and 106b, as shown in Fig. 6, the topmost portion 112 of the two residual amount reducing convex portions 110 may be connected. And formed into a shape integrally formed with the shape 104a at the same height of the shape 104a which is bulged into a convex shape or an arc shape.

The operation of constituting the residual amount reducing convex portion 110 as described above will be described with reference to Figs. 1 and 4A to 4C. Here, the residual amount reducing convex portion 110 is exemplified by being formed on the bottom plate 104, and the leading end 102a of the discharge pipe 102 is oriented toward the peripheral edge portion 104b side of the bottom plate 104.

The tip end portion 102a of the discharge tube 102 which is inserted into the mouth portion 106a of the resin can 10 and which is lowered in the vertical direction or the direction of the vertical direction by the mouth portion 106a is as shown in Fig. 4A, and the convex portion for reducing the residual amount The topmost portion 112 of the 110 is located on the side of the peripheral portion 104b of the bottom plate 104, and the remaining amount is reduced by the inclined surface 111 of the convex portion 110. Then, the discharge pipe 102 is further inserted, and as shown in Figs. 4B and 4C, the leading end 102a of the discharge pipe 102 is guided by the inclined surface 111 and lowered, and positioned on the peripheral portion 104b side of the bottom plate 104.

Therefore, the front end 102a of the discharge pipe 102 can be positioned on the side of the peripheral portion 104b when the residual container 3 is collected on the side of the peripheral portion 104b of the bottom plate 104 before the discharge of the container is completed.

As described above, according to the resin can 10 of the present embodiment, the tip end 102a of the discharge pipe 102 can be disposed at the bottom plate 104 where the residual container 3 gathers before the end of the discharge of the container, that is, the peripheral portion 104b side or the central portion 104c. On the side, the residual container 3 can be discharged. Therefore, according to the resin can barrel 101 of the present embodiment, the residual amount in the tank of the container 3 can be reduced as compared with the prior art.

Further, as shown in FIGS. 4B and 4C, the discharge tube 102 is in contact with the remaining amount reducing convex portion 110, and is slightly curved. Further, in order to minimize the residual amount of the container 3 in the can, as shown in Fig. 4C, the tip end 102a of the discharge tube 102 is made as close as possible to the inner surface of the bottom plate 104. Therefore, the length of the discharge pipe 102 when the residual amount reducing convex portion 110 is provided is preferably longer than the predetermined vertical depth of the inner surface of the mouth portion 106a to the bottom plate 104 according to the experimental results of the applicant. 60mm level.

Further, in the resin can 10 of the present embodiment, the molding of the residual amount reducing convex portion 110 is only a member for attaching the convex portion of the residual amount reducing convex portion 110 to a conventional mold which can be blow molded. Complete, no need to make new molds as a whole. Therefore, the resin cans 101 of the present embodiment can be used with great efficiency at a very low cost, and are more suitable.

Second embodiment:

In the resin can barrel 101 of the first embodiment, the residual amount reducing convex portion 110 is formed only in a part of the bottom plate 104 opposed to the mouth portion 106a. On the other hand, the resin can 101 of the second embodiment shown in Fig. 7 includes the residual amount reducing convex portion 131 formed on the entire circumference of the bottom plate 104-2. Further, in the resin can 101-2, the components other than the bottom plate 104-2 do not differ from the above-described structure of the resin can 101. Therefore, only the residual amount reducing convex portion 131 formed on the bottom plate 104-2 will be described below.

As shown in Fig. 7, the bottom plate 104-2 includes an inclined surface 111-2 formed on the entire circumference of the bottom plate 104-2. The inclined surface 111-2 is different in length from the inclined surface 111 described above, and its function is the same as that of the above-described inclined surface 111. The resin can 101 of the second embodiment is preset to be a type in which the residual container 3 will gather on the side of the peripheral portion 104b-2 of the bottom plate 104-2 before the discharge of the container is completed. Therefore, the topmost portion 112-2 of the inclined surface 111-2 is located on the side of the central portion 104c-2 of the bottom plate 104-2 with respect to the leading end 102a of the discharge pipe 102 lowered from the mouth portion 106a. Therefore, the discharge pipe 102 after the lowering is oriented toward the peripheral portion 104b-2 side. Further, the height H of the inclined surface 111-2 from the bottom surface can be the same as the height H of the inclined surface 111 in the first embodiment.

In the resin can 101-2, as shown in Fig. 7, the central portion 104c-2 of the uppermost portion 112-2 to the bottom plate 104-2 has been formed into a flat surface. However, the present invention is not limited to this embodiment, and the central portion 104c-2 may be formed in a concave shape.

Further, in the resin can 1011 of the second embodiment, before the discharge of the container is completed, the residual container 3 is collected on the side of the central portion 104c-2 of the bottom plate 104-2, as shown in Fig. 8. It is shown that the topmost portion 112-2 is located on the peripheral portion 104b-2 side of the bottom plate 104-2 with respect to the leading end 102a of the lowered discharge pipe 102, so that the inclined surface 111-2 is formed on the entire circumference of the bottom plate 104-2. . Further, the central portion 104c-2 is formed in a concave shape.

Third embodiment:

In the first embodiment and the second embodiment, as described above, the inner surface of the resin cans 101 and 101-2 is formed on the inner surface of the resin cans 101 and 101-2 along the parting line 107 to form a convex shape toward the can inner side 101a. Thick block (protrusion). Therefore, the resin can 101 as shown in Fig. 1 will have the remaining contents 3 gathered on the peripheral portion 104b side of the bottom plate 104 as shown in Fig. 9A, which will extend on the bottom plate 104 in the diametrical direction. The protrusion 107a is divided into a residual container 3a and a residual container 3b. However, the above phenomenon also occurs on the bottom plate of any of the above-described other types of resin cans.

When the remaining container 3 is divided into two parts, the orientation of the front end 102a of the discharge pipe 102 can be discharged by using the remaining amount reducing convex portion 110 or the like, and the state in which only the one-side amount of the residual container 3 can be discharged may occur. .

Therefore, as shown in Fig. 9B, the resin can 1010 of the present embodiment is provided with a non-protrusion region 141 having no protrusion 107a on the peripheral portion 104b of the bottom plate 104. In addition, in the embodiment, the resin cans 101 which are gathered in the peripheral portion 104b of the bottom plate 104 are exemplified, so that the non-protrusion area 141 is formed in the peripheral portion 104b, but in general, the discharge of the contents is finished. Previously, the non-protrusion area 141 may be formed on the bottom plate 104 corresponding to where the residual contents 3 are gathered.

By forming the non-protrusion region 141, the crotch portion in which the residual container 3 is divided into two portions can be eliminated. Therefore, according to the resin can 101 of the present embodiment, the residual container 3 can be caused to flow to any portion of the bottom plate 104, and the remaining container 3 can be discharged by the one discharge tube 102. As described above, according to the resin can 101 of the present embodiment, the synergistic effect of the residual amount reducing convex portion 110 or the like can be utilized, and the residual amount in the can of the container 3 can be reduced.

Fourth embodiment:

In the first to third embodiments, which have been described above, the resin cans 101 and the like of the single container formed by the blow molding of the resin material have been described. Further, heretofore, there has been known a container called a composite container which is formed by filling a resin-made blow-molded inner container into a double container having a rigidity larger than that of the inner container, such as a steel outer container. For example, there are already composite tanks for 10 to 20 liters and tanks, which are commonly used for chemical tanks (chemi drums) of 60 to 200 liters. The composite container is also inserted into the discharge tube from the mouth portion of the upper portion, and the container is discharged by the above-described pressurization method or the above-described pumping method. Further, the bottom plate of the inner container is not formed into a shape 104a in which a central portion of the bottom plate is bulged in a convex or arc shape toward the inner side 101a of the can, as in the case of the resin can 101 or the like. Further, the inner container is not limited to a cylindrical shape, and its shape is not limited.

Therefore, as shown in Fig. 10, the residual amount reducing convex portions 110 and 131 described in the first to third embodiments can also be applied to the resin in the above-mentioned composite can and the chemical tank. The above-described inner container was blown, and the same effects as those of the first to third embodiments were obtained.

In the composite container 150 shown in Fig. 10, the resin-made and blow-molded inner container 151 is provided with a residual amount reducing convex portion 152 corresponding to the residual amount reducing convex portions 110 and 131 on the bottom plate portion. Further, the composite container 150 is shown as an example of a container corresponding to the above-described composite can. Further, in the composite container 150, only the mouth portion 106a is formed, but of course, two mouth portions may be formed. Further, in the above-described composite drum tank shown in Fig. 10, the above-described pressurization method is used to discharge the contents. Therefore, the residual amount reducing convex portion 152 shown in Fig. 10 is in a state in which the discharge tube 102 can be oriented toward the center portion side of the container. However, the residual amount reducing convex portion 152 may of course be formed to orient the discharge pipe 102 toward the peripheral side of the container.

Further, the modified example of the residual amount reducing convex portion described in the first to third embodiments can be applied to the residual amount reducing convex portion 152, and the same effect can be obtained.

In the first to fourth embodiments described above, the bottom plate is provided with the remaining amount reducing convex portions 110, 117, 118, 131, and 152. In addition, in the fifth embodiment and the sixth embodiment, which will be described below, the residual amount reducing convex portion is not provided on the bottom plate, and the resin can can be reduced in comparison with the conventionally-retained residual amount of the container. . In the fifth embodiment and the sixth embodiment, the resin cans of the single container described in the first to third embodiments are not provided with the above-described residual amount reducing convex portion. The resin cans are described as an example. Therefore, the same components as those of the resin cans of the first to third embodiments will be assigned the same reference numerals and the description thereof will be omitted.

Further, in the resin cans of the fifth embodiment and the sixth embodiment, the container 3 is discharged by the evacuation method. Therefore, the container 3 will remain on the peripheral portion 104b of the bottom plate 104.

Fifth embodiment:

The resin can 201 of the fifth embodiment shown in Fig. 11A is produced by blowing a thermoplastic resin material such as a polyethylene material using a pair of molds, similarly to the resin can 101 of the first embodiment. Therefore, the above-mentioned parting line (PL) 107 will be formed on the inner surface of the can. As described above, the parting line 107 has a projection 107a which is a convex thick piece formed along the parting line 107 on the inside of the can as compared with the inner surface of the can other than the parting line 107. Further, the bottom plate 104 is also the same as that of the first embodiment, and the center portion of the bottom plate is formed into a convex or arc-shaped shape 104a which is bulged toward the can inner side 101a.

Further, as described above, the bottom plate 104 of the resin can 201 does not have a projection for reducing the amount of residue.

The resin can 201 having the above-described configuration is the same as that of the above-described third embodiment, and as shown in Fig. 11A, the non-protrusion region 141 having no projection 107a is provided on the peripheral portion 104b of the bottom plate 104. In the present embodiment, the resin cans 201 gathered on the peripheral portion 104b of the bottom plate 104 are exemplified by the residual container 3, so that the non-protrusion field 141 is formed in the peripheral portion 104b, but in general, it is contained. Before the end of the discharge of the contents, the non-protrusion area 141 may be formed on the bottom plate 104 corresponding to where the remaining contents 3 are gathered. Further, as shown in Fig. 11A, in the present embodiment, the non-protrusion region 141 is formed over the entire circumference of the peripheral portion 104b along the parting line 107, but may be formed only on the peripheral portion 104b as shown in Fig. 11B. Part of it.

As described above, the non-protrusion area 141 is formed, so that the residual container 3 is not divided into two parts by the bottom plate 104 as in the third embodiment, and can also flow to any part of the bottom plate 104, and can be discharged by one branch. The residual container 3 is discharged by the tube 102. Therefore, the amount of residue in the tank of the container 3 can be reduced as compared with the prior art.

The formation of the non-protrusion field 141 is performed as follows in the present embodiment.

That is, the resin can is formed by blowing a thermoplastic resin material using a pair of molds. After the production, the thermoplastic resin material is cooled and hardened, and as shown in Fig. 12, the pressing member 250 is lowered by the mouth portion 106a which is placed directly above the parting line 107 and into which the discharge pipe 102 is inserted, and is caused to be lowered. The non-protrusion area 141 is formed by abutting against the protrusion 107a and applying the following pressure to be flattened. Thereby, the non-protrusion area 141 forms a plane substantially the same as the peripheral portion 104b of the bottom plate 104.

The pressing member 250 is provided at its tip end with a flattened portion 251 made of steel. The flattened portion 251 has a size that can pass through the mouth portion 106a and has a size that can cover at least the projection 107a, and is used to form the non-protrusion region 141. The pressurizing member 250 is connected to the pressing device 255, and the pressing device 255 can automatically perform the operations of inserting, lowering, flattening, and withdrawing the resin can 201 from the resin can 201. Further, when the flattening operation is performed, the pressing member 250 is preferably heated to the same level as the temperature of the resin can 201. Further, at the time of the flattening operation, a support plate 252 such as steel is disposed on the bottom plate 104 outside the resin can 201.

Further, as described above, in the present embodiment, the non-protrusion field 141 is formed to have substantially the same plane as the peripheral portion 104b of the bottom plate 104, but may be formed to be more recessed than the peripheral portion 104b. When the non-protrusion area 141 is formed into a concave portion as described above, the residue of the container 3 can be concentrated on the non-protrusion area 141, and the tip end of the discharge tube 102 can be disposed in the non-protrusion area 141, so that the remaining liquid can be discharged more efficiently. The advantages.

Further, the non-protrusion region 141 may be formed in addition to the mouth portion 106a and further corresponding to the mouth portion 106b.

Sixth embodiment:

As described above, the resin can of the sixth embodiment is the same as the resin can 201 of the fifth embodiment, and the residual amount reducing convex portion is not formed on the bottom plate 104.

Further, in the resin can 200 of the sixth embodiment shown in Fig. 13A, the liquid collecting slopes 213a-1, 213a-2, 213b-1, and 213b-2 are formed in the peripheral portion 104b of the bottom plate 104 ( It may also be collectively referred to as a liquid collecting slope 213). The slab slanting surfaces 213 are diametrical positions 211a, 211b (also collectively referred to as diameter positions 211) that intersect at right angles to the parting line 107 toward the parting line positions 212a, 212b (also collectively referred to as parting line positions 212). ) A slope that is inclined downward. Further, in the present embodiment, as shown in Figs. 13A and 13B, the diameter position 211 is located at the same or slightly the same height as the bulged shape 104a, but is not limited thereto, and only needs to be in the shape 104a. Hereinafter, it may be higher than the height of the parting line position 212.

As described above, the liquid collecting slope 213 is formed in the peripheral portion 104b of the bottom plate 104, so that the residual contents 3 of the peripheral portion 104b can be collected at the position of the parting line positions 212a and 212b, that is, the positions corresponding to the mouth portions 106a and 106b. Therefore, the residual container 3 can be efficiently discharged by the discharge pipe 102, and the residual amount in the tank of the container 3 can be reduced as compared with the prior art.

Further, in the present embodiment, the reason for forming the resin can 220 is considered, and the diameter positions 211a, 211b are the topmost portions, and the liquid collecting slope 213 is formed as described above so that the residual contents 3 are respectively gathered in the parting mold. Line positions 212a, 212b. However, at the peripheral portion 104b of the bottom plate 104, the topmost portion is not limited to the above-described diameter positions 211a, 211b, and may be formed at any position. As described above, the discharge tube 102 is often provided in the mouth portion 106a. Therefore, it is preferable to form the liquid collecting slope 213 so that the residual container 3 gathers only at the parting line position 212a of the corresponding mouth portion 106a. That is, as shown in Fig. 13C, it is preferable to form the liquid collecting slope 213 with the parting line position 212b as the topmost portion and the parting line position 212a as the bottommost portion.

The formation of the liquid collecting slope 213 is performed as follows in the present embodiment. In addition, as described above, as shown in FIG. 13A, a case where the liquid collecting slope 213 is formed with the diameter positions 211a and 211b as the topmost portion is taken as an example.

That is, the resin can is formed by blowing a thermoplastic resin material using a pair of molds. After the preparation, before the thermoplastic resin material is cooled and hardened, on the outer peripheral portion 104b of the bottom plate 104 outside the resin can 202, as shown in Fig. 14, the two portions 261a and 261b on the circumference are arranged to protrude. Correction tool 260. Further, the two portions 261a, 261b correspond to the diameter positions 211a, 211b, respectively. Next, in a state in which the two portions 261a and 261b are in contact with the outer side of the bottom plate 104, the correcting mold 260 is pressed toward the inside of the can. Thereby, the liquid collecting slope 213 can be formed in the peripheral portion 104b of the bottom plate 104.

Further, in combination with the sixth embodiment and the fifth embodiment, the resin can also be formed in the peripheral portion 104b of the bottom plate 104 at the parting line position 212 as in the resin can 203 shown in Fig. 15. The protrusion area 141 is provided with a resin can having a liquid collecting slope 213.

In addition, the first embodiment can be combined with the first embodiment to form a resin can having a liquid collecting slope 213, a non-protrusion area 141, and a residual amount reducing convex portion 110.

Alternatively, the configurations of the above embodiments may be combined as appropriate. The above construction can achieve the individual effects of the combined embodiments.

Industrial availability

The present invention can be applied to a resin-made barrel, a composite container in which a resin-made internal container is filled in an outer container, and a method of manufacturing the above-described resin can.

1. . . Resin barrel

2. . . Discharge tube

3. . . Included

3. . . Residual content

3a. . . Residual content

3b. . . Residual content

4. . . Bottom plate

4a. . . shape

4b. . . Peripheral part

4c. . . Concave

101. . . Resin barrel

101a. . . Inside of the tank

101-2. . . Resin barrel

101-3. . . Resin barrel

102. . . Discharge tube

102a. . . Apex

102b. . . Lowering position

104. . . Bottom plate

104a. . . shape

104b. . . Peripheral part

104b-2. . . Peripheral part

104c. . . Central department

104c-2. . . Central department

104-2. . . Bottom plate

105. . . roof

106a, 106b. . . mouth

107. . . Parting line

107a. . . Protrusion

110. . . Residual amount reduction convex

111. . . Inclined surface

111-2. . . Inclined surface

112. . . Top

112-2. . . Top

117. . . Residual amount reduction convex

117a, 117b. . . Position control department

118. . . Residual amount reduction convex

118a. . . Central protrusion

119. . . Residual amount reduction convex

131. . . Residual amount reduction convex

141. . . Non-protrusion field

150. . . Composite container

151. . . Inner container

152. . . Residual amount reduction convex

201. . . Resin barrel

202. . . Resin barrel

203. . . Resin barrel

211. . . Diameter position

211a, 211b. . . Diameter position

212. . . Parting line position

212a, 212b. . . Parting line position

213. . . Liquid collecting bevel

213a-1, 213a-2, 213b-1, 213b-2. . . Liquid collecting bevel

250. . . Pressurized member

251. . . Flattening

252. . . Support plate

255. . . Pushing device

260. . . Correction tool

261a, 261b. . . Two parts

H. . . height

L. . . length

Fig. 1 is a cross-sectional view showing a resin container according to a first embodiment of the present invention.

Fig. 2 is a perspective view showing a convex portion for reducing a residual amount formed on a bottom plate of a resin container shown in Fig. 1.

Fig. 3 is a cross-sectional view showing a modification of one of the resin containers shown in Fig. 1.

Fig. 4A is a view showing the action of the convex portion for reducing the residual amount formed on the bottom plate of the resin container shown in Fig. 1.

Fig. 4B is a view showing the action of the convex portion for reducing the residual amount formed on the bottom plate of the resin container shown in Fig. 1.

Fig. 4C is a view showing the action of the convex portion for reducing the amount of the residue formed on the bottom plate of the resin container shown in Fig. 1.

Fig. 5A is a perspective view showing a modification of one of the convex portions for reducing the amount of the residue formed on the bottom plate of the resin container shown in Fig. 1.

Fig. 5B is a perspective view showing another modification of the convex portion for reducing the amount of the residue formed on the bottom plate of the resin container shown in Fig. 1.

Fig. 6 is a perspective view showing another modification of the residual portion for reducing the amount of the residue formed on the bottom plate of the resin container shown in Fig. 1.

Fig. 7 is a cross-sectional view showing a resin container according to a second embodiment of the present invention.

Fig. 8 is a cross-sectional view showing a modification of the resin container of the second embodiment shown in Fig. 7.

Fig. 9A is a perspective view showing a state in which the resin container shown in Fig. 1 is separated by the protrusion of the parting line and the remaining contents are separated.

Fig. 9B is a perspective view showing the bottom plate of the resin container according to the third embodiment of the present invention.

Figure 10 is a cross-sectional view showing a composite container of a fourth embodiment of the present invention.

Fig. 11A is a perspective view showing a bottom plate of a resin container according to a fifth embodiment of the present invention.

Fig. 11B is a perspective view showing a modification of the bottom plate of the resin container shown in Fig. 11A.

Fig. 12 is a view showing a method of producing a non-protrusion field of a resin container shown in Fig. 11A.

Fig. 13A is a perspective view showing a bottom plate of a resin container according to a fifth embodiment of the present invention.

Fig. 13B is a cross-sectional view of the A-A portion shown in Fig. 13A.

Fig. 13C is a perspective view showing a bottom plate of a modified example of the resin container shown in Fig. 13A.

Fig. 14 is a perspective view showing a mold used for the production of the resin container shown in Fig. 13A.

Fig. 15 is a perspective view showing a bottom plate of a resin container in which the fifth embodiment and the sixth embodiment of the present invention are combined.

Figure 16 is a cross-sectional view of a conventional resin canister showing the pumping method.

Figure 17 is a cross-sectional view of a conventional resin canister showing the manner of pressurization.

3. . . Residual content

101. . . Resin barrel

101a. . . Inside of the tank

102. . . Discharge tube

104. . . Bottom plate

104a. . . shape

104b. . . Peripheral part

104c. . . Central department

105. . . roof

106a, 106b. . . mouth

110. . . Residual amount reduction convex

111. . . Inclined surface

112. . . Top

Claims (5)

A resin container can be produced by blowing a thermoplastic resin with a pair of molds, and can discharge the contents through a discharge pipe, and the discharge pipe is inserted into the container from the mouth formed in the top plate, and the resin is made of resin. The container includes a residual amount reducing convex portion which is formed in a convex shape on the bottom plate of the resin container toward the inside of the container, and the discharge tube can be oriented to reduce the residual amount in the container of the container. Further, the residual amount reducing convex portion includes an inclined surface corresponding to at least a right side of the mouth portion, and abutting against a front end of the discharge tube, and facing the remaining container side in the container The leading end is located at a peripheral portion of the bottom plate or a central portion of the bottom plate, and the inclined surface and the residual amount reducing convex portion are formed only at positions corresponding to the right side of the mouth portion, and the residue remains. The amount-reducing convex portion has a position regulating portion to form an inverted shape, and the position regulating portion can position the leading end of the discharge tube to be formed at the bottom by the blow molding. Near the parting line on the. The resin container according to claim 1, wherein the bottom plate has a non-protruding field, and the non-protruding field is in a protrusion formed on the parting line on the bottom plate by the blowing, and the residual container may exist Part of it, without the above mentioned protrusions. A resin container which can be produced by blow molding a thermoplastic resin by a pair of molds, and can discharge the contents through a discharge pipe, and the discharge pipe system The bottom plate of the resin container is inserted into the container from the mouth of the top plate, and the bottom plate of the resin container has a liquid collecting slope at a peripheral portion of the bottom plate, and the liquid collecting slope is inclined downward toward a portion directly below the mouth portion. The bottom plate further has a non-protruding field, and the non-protruding field is in a protrusion formed on the parting line on the bottom plate by the blow molding, and a portion existing in the container is not present. . The resin container according to the third aspect of the invention, further comprising a convex portion for reducing a residual amount, wherein the convex portion for reducing the amount of the residual portion is formed into a convex shape toward the inside of the container, and the discharge tube can be oriented. In the case where the amount of the remaining amount in the container is reduced, the remaining amount reducing convex portion includes a liquid collecting slope, and the liquid collecting inclined surface position corresponds to at least the right side of the mouth portion, and the discharge tube is The tip abuts and can guide the front end toward the residual contents side of the container. A method for producing a resin container which can be produced by blow molding a thermoplastic resin with a pair of molds, and can discharge the contents through a discharge tube, and the discharge tube is formed from the mouth portion formed on the top plate Inserted in a container, the resin container is produced by the above-mentioned resin container by the above-mentioned blow molding, and before the thermoplastic resin is cured, the thermoplastic resin is formed on the parting line of the resin container by the above-mentioned blow molding. The remaining contents in the container in the protrusions are partially crushed to form a non-protruding field without the above protrusions.