JP5650291B2 - Plastic drum can - Google Patents

Description

  The present invention relates to a resin container such as a resin drum that is made of, for example, a polyethylene material, a composite container in which an inner container is loaded in an outer container, and a method for manufacturing the resin container.

  For example, there is a resin drum that is made by blow molding using a thermoplastic resin material such as a polyethylene material and has a name such as a poly drum or a plastic drum. Such resin-made drum cans are often used as containers for storing chemicals in the semiconductor field and the liquid crystal field, for example, because they are superior in chemical resistance, corrosion resistance and the like compared to steel drums. Examples of the chemical solution include a CMP slurry, a photoresist, a developer, an etching solution, and a cleaning solution in the semiconductor field, and a photoresist, a color resist, and a color filter material in the liquid crystal field.

  There are various sizes of the resin drums as described above, but there is also a type having a large capacity of, for example, 200 liters. In such a large-sized resin drum can, it is difficult to tilt the can itself and discharge the stored item when discharging the stored item. Therefore, as a discharge method, a method is adopted in which a discharge tube is inserted into the can through the mouth portion which is an opening formed in the top plate of the can, and the stored item is discharged through the discharge tube. A pump-up system that sucks up with a pump or a pressurization system that injects nitrogen gas or the like into the can and pressurizes the inside of the can to a pressure of about 5 to 200 kPa is adopted.

Sekisui Molding Industry Co., Ltd. Catalog “Sekisui Polydrum” (issued in September 2006) Sekisui Molding Industry Co., Ltd. “Plastic Jerry Can Polycon Plastic Drum Composite Container” (issued in October 2007)

  In any of the above-described pump-up method and pressurization method, a discharge tube is used to discharge the contents. At this time, a state where there is no gap between the suction port of the discharge tube and the bottom inner surface of the resin drum can is a state in which the suction port is blocked by the bottom inner surface, so that the discharge operation cannot be performed. Therefore, since some clearance is provided between the suction port and the bottom inner surface, the discharge tube 2 shorter than the depth from the mouth portion to the bottom plate can be used. However, in this case, as shown in FIG. 16, when the contents are discharged, the contents 3 always remain in the bottom portion of the resin drum 1 due to the gap, and the entire amount cannot be discharged. Even in the pump-up system, for example, nitrogen gas or the like is injected into the can in order to prevent the inside of the can from becoming negative pressure as the contents 3 are discharged.

  In particular, in the above-described large-sized resin drum can, as shown in FIG. 16, the bottom portion 4 of the resin drum can has a convex shape on the inside of the can in order to ensure rigidity when the contents 3 are stored. Or it has the shape 4a which swelled in circular arc shape, and is shape | molded. FIG. 16 shows the resin drum can 1 in which the convex shape 4a is formed in two stages from the outer periphery to the center of the can. Therefore, at the end of the discharge of the stored items, the stored items 3 gather at the peripheral portion 4b of the bottom plate 4, and the stored items 3 remain in the can at least by the height of the convex or swollen shape 4a.

  At this time, by using the discharge tube 2 longer than the depth from the mouth portion to the bottom plate, when the tip of the discharge tube 2 is accidentally located on the peripheral portion 4b side where the contents 3 are collected, The residual amount is reduced. However, due to the attachment method of the discharge tube 2 to the mouth and various conditions such as the hardness of the discharge tube 2, the tip of the discharge tube 2 is not always arranged on the residual container side, The idea of simply using a longer discharge tube 2 is not a solution.

  In the case of the pressurization method, since the internal pressure of the resin drum can 1 increases, as shown in FIG. 4c is formed. Therefore, in the case of the pressurization method, the contents 3 remain in the concave portion 4c, and generally, the residual amount in the can of the contents 3 is higher in the pressurization method than in the pump-up method. Become more. Therefore, there is a problem that the user of the resin drum can adopting the pressurization method needs to devise a reduction of the residual amount on the side of the contained material discharge device connected to the resin drum can 1.

  On the other hand, the chemicals and the like in the semiconductor field and the liquid crystal field described above are very expensive, and the user of the resin drum can want to reduce the residual amount as much as possible from the viewpoint of cost. Therefore, a user of a resin drum can has a very strong demand for reducing the residual amount with respect to the can manufacturer.

  Furthermore, with the recent increase in awareness of resources and the environment, there is an increasing demand for recycling resin drums after use. In the recycling of the resin drum can, the residue in the can is an unnecessary product, and waste liquid treatment is required, resulting in a processing cost. Therefore, there is also a demand for reduction of the residual amount from this point.

  Furthermore, the resin drum can is produced by blow molding as described above, and a parting line (PL) is formed on the inner surface of the can along a linear seam between a pair of molds. A lump (projection) of the resin material rising along the parting line is generated inside the can. Therefore, at the time when the remaining amount of the contents 3 is reduced due to the meat chunk, a state in which the contents 3 are divided into two parts also occurs. On the other hand, since there is only one discharge tube, there is a situation in which only the one-side accommodation 3 divided into two parts can be discharged. There is also a need to reduce the residual amount due to the structure peculiar to such a resin drum. The height of the meat block is proportional to the thickness of the resin drum. Therefore, in the case of a large resin drum having a relatively large internal capacity of about 100 to 200 liters, the necessity for reducing the residual amount due to the structure described above increases.

  The present invention has been made to meet the above-described problems and demands, and is capable of reducing the residual amount of the contents in the container as compared with the conventional case, and the manufacture of the resin container. It aims to provide a method.

In order to achieve the above object, the present invention is configured as follows.
That is, the resin container according to the first aspect of the present invention is a resin container produced by blow molding a thermoplastic resin with a pair of molds, and is inserted into the container through the mouth formed on the top plate. In the resin container in which the contents are discharged through the discharge tube,
A residual amount reducing convex portion which is formed in a convex shape toward the inside of the container on the bottom plate of the resin container and orients the discharge tube to reduce the residual amount in the container of the contents, and at least the mouth portion And a residual amount reducing convex portion having an inclined surface that is positioned corresponding to the bottom of the container and that is in contact with the distal end of the discharge tube and that guides the distal end toward the residual container in the container. And

  The residual container is located at a peripheral portion of the bottom plate, the inclined surface is formed over the entire circumference of the bottom plate, and the residual amount reducing convex portion extends to a central portion of the bottom plate, The central portion may be configured with a flat surface.

  The residual container 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 molded only at a position corresponding to a position directly below the mouth portion. Also good.

  The residual container is located at the center of the bottom plate, the inclined surface is formed over the entire circumference of the bottom plate, and the center of the bottom plate is concave with respect to the residual amount reducing convex portion. May be configured.

  The residual amount reducing convex portion may be formed in a U shape having a position restricting portion for positioning the tip of the discharge tube in the vicinity of a parting line formed on the bottom plate by the blow molding. Good.

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

  Further, the bottom plate may have a non-projection region without the projection in a portion where the residual accommodation exists among projections on the parting line formed on the bottom plate by the blow molding.

Furthermore, the composite container according to the second aspect of the present invention is manufactured by blow molding a thermoplastic resin with a mold, and is manufactured using an interior container that accommodates the contents and a material that is higher in rigidity than the interior container. A composite container in which the contents are discharged through a discharge tube inserted into the interior container from the mouth of the exterior container and the interior container.
The interior container is a residual amount reducing convex portion that is formed convexly toward the inside of the container on the bottom plate of the interior container, and has an inclined surface, the discharge tube is oriented, and the residual amount of the contents A convex portion for reducing the residual amount, and the inclined surface is positioned corresponding to at least directly below the mouth, the tip of the discharge tube abuts, and the tip is placed in the interior container. It is characterized by guiding to the residual contents side.

The resin container according to the third aspect of the present invention is a resin container produced by blow molding a thermoplastic resin with a pair of molds, and is inserted into the container from the mouth formed on the top plate. In the resin container in which the contents are discharged through the discharge tube,
The bottom plate of the resin container has a non-projection region without the projections on the part where the residual contents in the container exist among the projections on the parting line formed on the bottom plate by the blow molding. Features.

The resin container according to the fourth aspect of the present invention is a resin container prepared by blow molding a thermoplastic resin with a pair of molds, and is inserted into the container from the mouth formed on the top plate. In the resin container in which the contents are discharged through the discharge tube,
The bottom plate of the resin container has a liquid collection slope at a peripheral portion of the bottom plate that is inclined downward with respect to a portion directly below the mouth.

  In the fourth aspect, the bottom plate further includes a non-projection region having no projections on a portion of the projections on the parting line formed on the bottom plate by the blow molding, where the residual contents in the container are present. You may comprise so that it may have.

  Further, in the fourth aspect, the bottom plate is formed with a convex toward the inside of the container, and is a residual amount reducing convex portion that orients the discharge tube to reduce the residual amount in the container of the contents, Residual amount-reducing convex portion that is located corresponding to at least directly below the mouth portion, has a liquid collection slope that abuts the distal end of the discharge tube, and guides the distal end toward the residual contents in the container. May be further provided.

Furthermore, the method for manufacturing a resin container according to the fifth aspect of the present invention is a resin container produced by blow molding a thermoplastic resin with a pair of molds, from the mouth formed on the top plate. In the manufacturing method of the resin container in which the contents are discharged through the discharge tube inserted into the container,
After producing the resin container by the blow molding, before the thermoplastic resin is cured, the protrusions on the parting line formed on the bottom plate of the resin container by the blow molding are within the container. A non-projection region without the above-mentioned projection is formed by crushing a portion where there is a residual container.

Moreover, the manufacturing method of the resin container in the 6th aspect of this invention is a resin container produced by blow-molding a thermoplastic resin with a pair of metal molds, and the container is formed from the mouth formed on the top plate. In the manufacturing method of the resin container in which the contents are discharged through the discharge tube inserted into the inside,
After the resin container is produced by the blow molding, before the thermoplastic resin is cured, the liquid collection is inclined downward with respect to the portion directly below the mouth at the peripheral portion of the bottom plate of the resin container. It is characterized by forming a slope.

  According to the resin container in the first aspect, by providing the bottom plate with the residual amount reducing convex portion, the tip of the discharge tube inserted from the mouth of the resin container is made to remain on the bottom plate of the resin container. It can be guided to the contents side. Therefore, the residual amount of the contents in the container can be reduced as compared with the conventional case.

  Moreover, according to the composite container in the said 2nd aspect, the interior container equips the bottom plate with the convex part for residual amount reduction. Therefore, the tip of the discharge tube inserted from the mouth can be guided to the residual container side in the bottom plate of the interior container provided in the composite container. Therefore, the residual amount of the contents in the container can be reduced as compared with the conventional case.

  In addition, according to the resin container in the third aspect and the method for producing the resin container in the fifth aspect, the protrusions on the parting line are provided with the non-protrusion regions, so that the residual contents in the container are In the peripheral portion of the bottom plate, the bottom plate is not divided into two by the protrusions on the parting line. Therefore, the residual contents in the peripheral portion can be discharged by a single discharge tube, and the residual amount of the stored contents in the container can be reduced as compared with the conventional case.

  In addition, according to the resin container in the fourth aspect and the resin container manufacturing method in the sixth aspect, the bottom plate has an inclined surface that is inclined downward with respect to the portion directly below the mouth portion. Residual contents in the peripheral edge portion gather at the portion immediately below the mouth, that is, the portion where the tip of the discharge tube is located. Therefore, the residual amount of the contents in the container can be reduced as compared with the conventional case.

It is sectional drawing of the resin-made containers in 1st Embodiment of this invention. It is a perspective view which shows the convex part for residual amount reduction | molding shape | molded on the bottom plate of the resin container shown in FIG. It is sectional drawing in the modification of the resin containers shown in FIG. It is a figure for demonstrating the effect | action of the convex part for residual amount reduction | molding shape | molded on the bottom plate of the resin container shown in FIG. It is a figure for demonstrating the effect | action of the convex part for residual amount reduction | molding shape | molded on the bottom plate of the resin container shown in FIG. It is a figure for demonstrating the effect | action of the convex part for residual amount reduction | molding shape | molded on the bottom plate of the resin container shown in FIG. It is a perspective view which shows one modification of the convex part for residual amount reduction | molding shape | molded on the bottom plate of the resin container shown in FIG. It is a perspective view which shows the other modification of the convex part for residual amount reduction | molding shape | molded on the bottom plate of the resin container shown in FIG. It is a perspective view which shows another modification of the convex part for residual amount reduction | molding shape | molded on the bottom plate of the resin container shown in FIG. It is sectional drawing of the resin-made containers in 2nd Embodiment of this invention. It is sectional drawing in the modification of the resin-made containers in 2nd Embodiment shown in FIG. In the resin container shown in FIG. 1, it is a perspective view for demonstrating the state in which a residual thing is parted by the protrusion of a parting line. It is a perspective view which shows the bottom plate of the resin-made containers in 3rd Embodiment of this invention. It is sectional drawing which shows the composite container in 4th Embodiment of this invention. It is a perspective view which shows the bottom plate of the resin-made containers in 5th Embodiment of this invention. It is a perspective view which shows the modification in the baseplate of the resin-made containers shown to FIG. 11A. It is a figure for demonstrating the method of producing the non-projection area | region in the resin-made containers shown to FIG. 11A. It is a perspective view which shows the bottom plate of the resin-made containers in 5th Embodiment of this invention. It is sectional drawing of the AA part shown to FIG. 13A. It is a perspective view which shows the baseplate in the modification of the resin-made containers shown to FIG. 13A. It is a perspective view of the jig | tool for producing the resin-made containers shown to FIG. 13A. It is a perspective view which shows the baseplate of the resin-made containers which combined 5th Embodiment and 6th Embodiment of this invention. It is sectional drawing of the conventional resin-made drum cans, and is a figure which shows the case of a pump-up system. It is sectional drawing of the conventional resin-made drum cans, and is a figure which shows the case of a pressurization system.

  A resin container, a composite container, and a method for manufacturing the resin container according to an embodiment of the present invention will be described below with reference to the drawings. In each figure, the same or similar components are denoted by the same reference numerals. The composite container corresponds to a double container in which a resin-made inner container is loaded in an outer container having higher rigidity than the inner container.

1st Embodiment;
FIG. 1 shows a resin drum can 101 according to this embodiment. Here, the resin drum can 101 corresponds to an example of a resin container. Moreover, the said resin container is not limited to cylindrical shape like the resin drum 101, For example, square shape etc. may be sufficient and the shape is not ask | required.
The resin drum can 101 is produced by blow molding a thermoplastic resin material such as a polyethylene material using a pair of molds in the same manner as the conventional resin drum can 1 described above. Also, since the resin drum can 101 is divided into two equal parts in the longitudinal direction on the inner surface of the can because of blow molding, a linear parting line (PL) 107 (corresponding to the joint portion between the pair of molds) 2) is formed. In the parting line 107, a convex meat lump is formed along the parting line 107 on the inner side of the can compared to 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 drum can 1 has a central portion swelled in a convex shape or an arc shape inside the can in order to ensure rigidity when accommodating the contents. It is molded in the shape 4a. As shown in FIG. 1, the bottom plate 104 of the resin drum can 101 in the present embodiment is similarly formed with a shape 104a in which the center portion of the bottom plate bulges into the can inner side 101a in a convex or arc shape.

  In the resin drum can 101 in the present embodiment, in addition to the shape 104a, the bottom plate 104 is further formed with a residual amount reducing convex portion 110, which is one of the characteristic components of the resin drum can 101. The remaining amount reducing convex portion 110 will be described in detail below.

On the top plate 105 of the resin drum can 101, as in the conventional resin drum can 1, mouths 106a and 106b are formed at two locations along the diameter direction of the top plate 105. The mouth portions 106a and 106b are openings in the top plate 105 for injecting and discharging the contents. When the discharge tube 102 is used to discharge the contents, the mouth portions 106a and 106b As shown in FIG. 1, for example, a discharge tube 102 is inserted into the mouth portion 106a, and a nitrogen gas injection pipe, for example, is attached to the other. The mouth portions 106a and 106b have a structure that keeps the can inner side 101a airtight. Further, in the resin drum 101 according to the present embodiment, the above-described pump-up method or pressurization method is adopted as the conventional method for discharging the contents using the discharge tube 102. Moreover, you may comprise so that both the discharge tube 102 and the said nitrogen gas injection pipe may be attached to either one of the opening parts 106a and 106b. In this case, the other mouth is sealed.
Further, the mouth portions 106a and 106b are located at the joint portion of the pair of molds. Therefore, the mouth portions 106 a and 106 b are located on the parting line 107.

  In this embodiment, the discharge tube 102 is made of resin and is a flexible pipe. The discharge tube 102 only needs to be flexible at least at the tip portion, and the whole may not be made of a resin material, and the whole may not have flexibility.

  In the bottom plate 104, the remaining amount reducing convex portion 110 is provided with a mouth portion (hereinafter referred to as “106a”) corresponding to FIG. 2), a part of the bottom plate 104 is formed so as to protrude toward the can inner side 101a as shown in FIG. FIG. 2 shows a form in which two residual amount reducing convex portions 110 are formed on the bottom plate 104 corresponding to the mouth portions 106a and 106b, but at least the discharge tube 102 is inserted. One residual amount reducing convex portion 110 may be formed corresponding to the mouth portion 106a.

  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 described below are both parting lines. Although it is formed in a symmetrical shape with respect to 107, it is not limited to this, and it may be formed in a left-right asymmetric shape.

Such a residual amount reducing convex portion 110 has an inclined surface 111. The inclined surface 111 is an inclined surface with which the distal end 102a of the discharge tube 102 inserted through the mouth portion 106a comes into contact and guides the distal end 102a toward the residual container 3 in the can. Immediately before the discharge of the stored matter, for example, when the residual stored matter 3 is collected on the peripheral portion 104b side of the bottom plate 104, the tip 102a of the discharge tube 102 is guided to the peripheral portion 104b side as shown in FIG. In addition, the inclined surface 111 is disposed. The peripheral portion 104b corresponds to a portion of the bottom plate 104 other than the swollen shape 104a.
On the other hand, as already described, when the stored liquid is discharged by the pressurization method, the central portion 104c of the bottom plate 104 bulges outward from the can and becomes convex, and the residual storage 3 collects on the central portion 104c side. There is also. In this case, as shown in FIG. 3, the inclined surface 111 is disposed so as to guide the distal end 102a of the discharge tube 102 toward the central portion 104c.

  Note that it is possible to predict in advance whether the residual storage 3 is collected on the peripheral edge portion 104b side or the central portion 104c side immediately before the discharge of the storage material. That is, in the case of the pump-up method, it is the peripheral portion 104b side, and in the case of the pressurization method, prediction can be made based on the form and size of the shape 4a in the bottom plate 104 and the pressurization pressure. Therefore, the installation position of the inclined surface 111 can be designed.

  The guide direction of the distal end 102a of the discharge tube 102 toward the peripheral portion 104b or the central portion 104c 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 installed directly below the mouth portion 106a into which the discharge tube 102 is inserted, and the discharge tube 102 that has passed through the mouth portion 106a is placed in the can along the vertical line or the substantially vertical line. Come down. Therefore, when it is desired to orient the tip 102a of the discharge tube 102 toward the peripheral portion 104b of the bottom plate 104, the top portion 112 of the residual amount reducing convex portion 110 is connected to the discharge tube 102 as shown in FIG. 4A. What is necessary is just to position it in the center part 104c side rather than the descent | fall position 102b. On the other hand, when it is desired to orient the distal end 102a of the discharge tube 102 toward the central portion 104c of the bottom plate 104, the top portion 112 is positioned closer to the peripheral portion 104b side of the bottom plate 104 than the lowered position 102b, as shown in FIG. What is necessary is just to be located. In this way, the guide direction of the discharge tube 102 can be designed.

  The shape of the residual amount reducing convex portion 110 is, for example, a shape as shown in FIG. 2, and the inclined surface 111 and the top portion 112 are curved and extend along the circumferential direction of the bottom plate 104. In one embodiment of the residual amount reducing convex portion 110 as shown in FIG. 2, the length L needs to be at least about 40 mm. This is because, when the length L is shorter than this, there is a possibility that the tip 102a of the discharge tube 102 cannot be reliably oriented to the residual contents 3 side. The height H from the lowermost surface of the bottom plate 104 to the top portion 112 is about 6 to 50 mm. When the height H is lower than 6 mm, it is not preferable because the distal end 102a of the discharge tube 102 may not be reliably oriented toward the residual contents 3. On the other hand, when the height H is higher than 50 mm, the residual amount Since the shape of the convex part 110 for reduction becomes large, problems such as a decrease in the basic strength of the resin drum can 101 occur in blow molding, which impairs the moldability of the convex part 110 for reducing the residual amount. This is not preferable because of the possibility.

  The angle of the inclined surface 111 is about 10 degrees to about 80 degrees with respect to the horizontal portion of the bottom plate 104, and preferably about 45 degrees to 60 degrees. Since the inclined surface 111 has an inclination angle of about 10 degrees to about 80 degrees, the distal end 102a of the discharge tube 102 can be more reliably oriented toward the residual container 3 side.

  Further, the shape of the residual amount reducing convex portion 110 is not limited to that shown in FIG. For example, shapes such as a residual amount reducing convex portion 117 shown in FIG. 5A and a residual amount reducing convex portion 118 shown in FIG. 5B can be adopted.

5A has a C-shaped or U-shaped planar shape so that the tip 102a of the discharge tube 102 is disposed in the vicinity of the parting line 107. That is, the residual amount reducing convex portion 117 has position restricting portions 117 a and 117 b that position the distal end 102 a of the discharge tube 102 in the vicinity of the parting line 107.
When the tip 102a of the discharge tube 102 is oriented toward the central portion 104c of the bottom plate 104, the position restricting portions 117a and 117b are oriented toward the central portion 104c, contrary to the case of FIG. 5A.

  5B has a central protrusion 118a extending along the parting line 107 so that the tip 102a of the discharge tube 102 is disposed avoiding the parting line 107.

  Furthermore, in the embodiment in which the two residual amount reducing convex portions 110 are formed on the bottom plate 104 corresponding to the mouth portions 106a and 106b, as shown in FIG. 6, the top portions 112 of both residual amount reducing convex portions 110 are formed. It may be formed integrally with the shape 104a at the same height as the shape 104a that is connected and swelled in a convex or arc shape.

  The operation of the remaining amount reducing convex portion 110 configured as described above will be described with reference to FIGS. 1 and 4A to 4C. Here, the case where the residual amount reducing convex portion 110 is formed on the bottom plate 104 so as to orient the tip 102a of the discharge tube 102 toward the peripheral edge portion 104b of the bottom plate 104 is taken as an example.

  As shown in FIG. 4A, the distal end 102a of the discharge tube 102 that is inserted into the mouth portion 106a of the resin drum can 101 and passes through the mouth portion 106a and descends along the vertical direction or the substantially vertical direction is a residual amount. With respect to the top part 112 of the reduction convex part 110, it contacts the inclined surface 111 of the residual quantity reduction convex part 110 located on the peripheral edge 104b side of the bottom plate 104. Thereafter, as the discharge tube 102 is further inserted, as shown in FIGS. 4B and 4C, the tip 102a of the discharge tube 102 descends while being guided by the inclined surface 111, and the peripheral portion 104b side of the bottom plate 104 Is positioned.

  Therefore, when the remaining contained material 3 gathers on the side of the peripheral portion 104b of the bottom plate 104 immediately before the end of the discharge of the stored matter, the tip 102a of the discharge tube 102 can be positioned on the side of the peripheral portion 104b.

  As described above, according to the resin drum can 101 of the present embodiment, the discharge tube 102 is disposed at the position of the bottom plate 104 where the residual storage 3 gathers immediately before the discharge of the storage, that is, the peripheral portion 104b side or the central portion 104c side. The tip 102a can be reliably arranged, and the residual contents 3 can be discharged. Therefore, according to the resin drum can 101 of the present embodiment, the residual amount of the contents 3 in the can can be reduced as compared with the conventional case.

  As shown in FIGS. 4B and 4C, the discharge tube 102 is slightly curved by coming into contact with the residual amount reducing convex portion 110. Furthermore, in order to reduce the residual amount of the contents 3 in the can as much as possible, the tip 102a of the discharge tube 102 needs to be as close as possible to the inner surface of the bottom plate 104 as shown in FIG. 4C. Therefore, the length of the discharge tube 102 in the case where the residual amount reducing convex portion 110 is provided is based on the prescribed vertical depth from the mouth portion 106a to the inner surface of the bottom plate 104 according to the applicant's experiment. It is preferable to set the length of about 5 to 60 mm longer.

  Further, in the resin drum can 101 of the present embodiment, the residual amount reducing convex portion 110 is formed by using a convex member for forming the residual amount reducing convex portion 110 in a conventional mold for blow molding. All you have to do is install it, and there is no need to renew the entire mold. Therefore, the resin drum 101 of this embodiment is preferable because it can obtain a high effect at a very low cost.

A second embodiment;
In the resin drum can 101 in the first embodiment described above, the residual amount reducing convex portion 110 is formed only on a part of the bottom plate 104 facing the mouth portion 106a. On the other hand, the resin drum can 101-2 in the second embodiment shown in FIG. 7 has a residual amount reducing convex portion 131 formed over the entire circumference of the bottom plate 104-2. In the resin drum can 101-2, the components other than the bottom plate 104-2 are the same as those in the resin drum can 101 described above. Therefore, hereinafter, only the residual amount reducing convex 131 formed on the bottom plate 104-2 will be described.

  As shown in FIG. 7, the bottom plate 104-2 has an inclined surface 111-2 formed over the entire circumference of the bottom plate 104-2. The inclined surface 111-2 is only different in length from the above-described inclined surface 111, and the function thereof is the same as that of the above-described inclined surface 111. The resin drum can 101-2 according to the second embodiment assumes a type in which the residual contents 3 gather on the peripheral edge portion 104b-2 side of the bottom plate 104-2 immediately before the discharge of the contents. Therefore, the top part 112-2 of the inclined surface 111-2 is located on the center part 104c-2 side of the bottom plate 104-2 with respect to the tip 102a of the discharge tube 102 descending from the mouth part 106a. Therefore, the discharge tube 102 that has been lowered is oriented toward the peripheral portion 104b-2. Moreover, the height H from the bottom surface of the inclined surface 111-2 can take the same value as the height H of the inclined surface 111 in the case of 1st Embodiment.

  In the resin drum 101-2, as shown in FIG. 7, the top 112-2 is formed on a flat surface over the central portion 104c-2 of the bottom plate 104-2. However, the present invention is not limited to this configuration, and the central portion 104c-2 may be formed in a concave shape.

  Further, in the case where the resin drum 101-2 in the second embodiment is a type in which the residual contents 3 are collected on the central portion 104c-2 side of the bottom plate 104-2 immediately before the discharge of the stored contents, FIG. As shown in FIG. 4, the top surface 112-2 is positioned on the side of the peripheral edge portion 104b-2 of the bottom plate 104-2 with respect to the tip 102a of the discharging tube 102 descending, and the inclined surface 111-2 is formed on the bottom plate. Molded over the entire circumference of 104-2. Further, the central portion 104c-2 is formed in a concave shape.

A third embodiment;
In both cases of the first embodiment and the second embodiment, as described above due to the manufacturing method, the inner surfaces of the resin drum cans 101 and 101-2 are arranged along the parting line 107 inside the can. A meat block (projection) formed in a convex shape toward 101a is formed. Thus, for example, in the case of the resin drum 101 shown in FIG. 1, as shown in FIG. 9A, the residual contents 3 gathered on the peripheral edge portion 104b side of the bottom plate 104 are the protrusions extending along the diameter direction of the bottom surface 104. By 107a, it will be divided into the residual accommodation 3a and the residual accommodation 3b. Such a phenomenon occurs in the bottom plate of any of the resin drums in the other forms described above.

  In this way, when the residual material 3 is divided into two, even if the tip 102a of the discharge tube 102 is oriented using the residual amount reducing convex portion 110 or the like, only the residual material 3 for one side is obtained. There is concern about the situation where it cannot be discharged.

  Therefore, as shown in FIG. 9B, the resin drum can 101-3 of the present embodiment has a non-projection region 141 without the projection 107 a on the peripheral portion 104 b of the bottom plate 104. In this embodiment, since the resin drum 101 in which the residual contents 3 gather on the peripheral portion 104b of the bottom plate 104 is taken as an example, the non-projection region 141 is formed on the peripheral portion 104b. Just before the end of the discharge, the non-projection region 141 may be formed corresponding to the location where the residual material 3 gathers on the bottom plate 104.

  By forming the non-projection region 141, there is no weir for dividing the residual contents 3 into two places. Therefore, according to the resin drum can 101-3 of the present embodiment, the residual container 3 can flow to any location on the bottom plate 104, and the residual container 3 is removed by one discharge tube 102. Can be discharged. As described above, according to the resin drum can 101-3 of the present embodiment, the residual amount in the can of the contents 3 can be further reduced by a synergistic effect with the residual amount reducing convex portion 110 and the like.

4th Embodiment;
In the first to third embodiments described above, the resin drum 101 or the like, which is a single container formed by blow molding of a resin material, has been described. On the other hand, there is also a container called a composite container, which consists of a double container in which an inner container made of resin and blow-molded has a higher rigidity than the inner container, for example, a steel outer container. . For example, there are composite pail cans mainly for 10 to 20 liters, and cans generally named 60 to 200 liters, generally named as a chemi drum. Also in these composite containers, a discharge tube is inserted from the mouth provided at the top, and the contents are discharged by the pressurization method or the pump-up method. The bottom plate of the interior container is not formed with a shape 104a in which the center of the bottom plate of the bottom plate 104 bulges into the can inner side 101a in a convex shape or an arc shape like the resin drum can 101 or the like. Moreover, the said interior container is not limited to a cylindrical shape, The shape is not ask | required.

  Therefore, the residual amount reducing convex portions 110 and 131 described in the first to third embodiments are blow-molded with resin in the composite pail can and the chemi drum can as shown in FIG. It is also possible to apply to an interior container, and it is possible to obtain the same effect as the first to third embodiments.

In the composite container 150 shown in FIG. 10, an interior container 151 made of resin and blow-molded has a residual amount reducing convex portion 152 corresponding to the residual amount reducing convex portions 110 and 131 in the bottom plate portion. In addition, the composite container 150 shows the container equivalent to the said composite pail can as an example. 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 composite pail can shown in FIG. 10, the contents are often discharged by the pressurization method. Therefore, the residual amount reducing convex portion 152 shown in FIG. 10 shows a case where the discharge tube 102 is molded so as to be oriented toward the container central portion. However, the remaining amount reducing convex portion 152 may of course be shaped so that the discharge tube 102 is oriented toward the peripheral side of the container.
Moreover, it is also possible to apply the modification of the residual amount reducing convex portion described in the first to third embodiments 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 includes the residual amount reducing convex portions 110, 117, 118, 131, and 152. On the other hand, in the fifth embodiment and the sixth embodiment described below, a resin drum can that can reduce the residual amount in the can of the contents compared to the conventional case without providing a convex portion for reducing the residual amount on the bottom plate. Describe. Here, in the fifth embodiment and the sixth embodiment, the resin in the form in which the residual amount reducing convex portion is excluded from the resin drum that is a single container described in the first to third embodiments. Take a drum can as an example. Therefore, the same components as those of the resin drum in the first to third embodiments are denoted by the same reference numerals, and the description thereof is omitted here.
Moreover, in the resin-made drum can in 5th Embodiment and 6th Embodiment, the system which discharges | emits the accommodated material 3 by a pump-up system is taken. Therefore, the contents 3 remain on the peripheral portion 104b of the bottom plate 104.

A fifth embodiment;
A resin drum can 201 in the fifth embodiment shown in FIG. 11A is formed by blow molding a thermoplastic resin material such as a polyethylene material using a pair of molds, for example, similarly to the resin drum can 101 in the first embodiment. Produced. Therefore, the parting line (PL) 107 is formed on the inner surface of the can. In the parting line 107, as described above, a convex mass, that is, a protrusion 107 a is formed along the parting line 107 on the inner side of the can compared to the inner surface of the can other than the parting line 107. Similarly to the first embodiment, the bottom plate 104 is formed in a shape 104a in which the central portion of the bottom plate swells in a convex shape or an arc shape on the inner side 101a of the can.
On the other hand, as described above, the residual amount reducing convex portion is not formed on the bottom plate 104 of the resin drum can 201.

  Similar to the configuration in the third embodiment, the resin drum 201 having such a configuration has a non-projection region 141 having no projection 107a on the peripheral portion 104b of the bottom plate 104, as shown in FIG. 11A. In the present embodiment, since the resin drum 201 that collects the residual contents 3 at the peripheral portion 104b of the bottom plate 104 is taken as an example, the non-projection region 141 is formed at the peripheral portion 104b. Immediately before, the non-projection region 141 may be formed corresponding to the location where the residual material 3 gathers on the bottom plate 104. 11A, in the present embodiment, the non-projection region 141 is formed over the entire peripheral portion 104b along the parting line 107. However, as illustrated in FIG. 11B, the non-projection region 141 is formed only in a part of the peripheral portion 104b. It may be formed.

  By forming the non-projection region 141 in this way, as described in the third embodiment, the residual container 3 flows to any place of the bottom plate 104 without being divided into two by the bottom plate 104. This makes it possible to discharge the residual contents 3 with one discharge tube 102. Therefore, it becomes possible to reduce the residual amount of the contents 3 in the can as compared with the conventional case.

In the present embodiment, the non-projection region 141 is formed as follows.
That is, the resin drum can 201 is produced by blow-molding a thermoplastic resin material using a pair of molds. After the production, before the thermoplastic resin material cools and hardens, as shown in FIG. 12, it is positioned directly above the parting line 107 and passes through the mouth portion 106a into which the discharge tube 102 is inserted. The member 250 is lowered, abuts against the protrusion 107a, and is pressed and crushed to form a non-protrusion region 141. As a result, the non-projection region 141 becomes substantially the same plane as the peripheral portion 104 b of the bottom plate 104.

  The press member 250 has a crushing portion 251 made of steel at the tip. The crushing portion 251 is a member that can pass through the mouth portion 106 a and has a size that covers at least the projection 107 a and forms the non-projection region 141. Such a press member 250 is connected to the pressing device 255, and the pressing device 255 automatically performs operations of insertion into the resin drum can 201, lowering, crushing, and removal from the resin drum can 201. In the crushing operation, the press member 250 is preferably heated to the same level as the temperature of the resin drum 201. In the crushing operation, a base plate 252 made of, for example, steel is disposed on the bottom plate 104 outside the resin drum 201.

  As described above, in the present embodiment, the non-projection region 141 is formed as substantially the same plane as the peripheral portion 104b of the bottom plate 104, but may be formed to be concave as compared with the peripheral portion 104b. Thus, when the non-projection area | region 141 is formed as a recessed part, the residue of the storage thing 3 can be collected in the non-projection area | region 141 part, and the front-end | tip of the discharge tube 102 can be arrange | positioned in the non-projection area | region 141. There is an advantage that the remaining liquid can be discharged more efficiently.

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

A sixth embodiment;
As described above, in the resin drum can in the sixth embodiment, the bottom plate 104 is not formed with the residual amount reducing convex portion, similarly to the resin drum can 201 in the fifth embodiment.
On the other hand, in the resin drum can 202 in the sixth embodiment shown in FIG. 13A, the liquid collection slopes 213a-1, 213a-2, 213b-1, 213b-2 (collectively) are provided on the peripheral portion 104b of the bottom plate 104. , And may be referred to as a liquid collection slope 213). These liquid collection slopes 213 extend from diameter positions 211a and 211b (collectively referred to as diameter positions 211) that intersect at right angles to the parting line 107 to parting line positions 212a and 212b (collectively). , Which may be referred to as a parting line position 212). In the present embodiment, as shown in FIGS. 13A and 13B, the diameter position 211 is located at the same or substantially the same height level as the bulging shape 104a portion, but is not limited to this. What is necessary is just to be located higher than the height level of the parting line position 212 below the 104a part.

  In this way, by forming the liquid collection inclined surface 213 on the peripheral portion 104b of the bottom plate 104, the residual contents 3 in the peripheral portion 104b are positioned corresponding to the parting line positions 212a and 212b, that is, the mouth portions 106a and 106b. To gather. Therefore, the residual container 3 can be efficiently discharged by the discharge tube 102, and the residual amount of the container 3 in the can can be reduced as compared with the conventional case.

  In the present embodiment, for the reason of molding of the resin drum 202, the residual contents 3 are collected at the parting line positions 212a and 212b as described above with the diameter positions 211a and 211b as the top portions. A liquid slope 213 was formed. However, in the peripheral portion 104b of the bottom plate 104, the top portion is not limited to the diameter positions 211a and 211b, and may be formed at any position. On the other hand, as described above, the discharge tube 102 is often provided in the mouth portion 106a. Therefore, it is more preferable to form the liquid collection slope 213 so that the residual contents 3 gather only at the parting line position 212a corresponding to the mouth portion 106a. That is, as shown in FIG. 13C, it is more preferable to form the liquid collection slope 213 so that the parting line position 212b is the top part and the parting line position 212a is the lowest part.

In the present embodiment, the liquid collection slope 213 is formed as follows. The description here takes as an example a case in which the liquid collection inclined surface 213 is formed with the diameter positions 211a and 211b as top portions as shown in FIG. 13A.
That is, the resin drum can 202 is manufactured by blow-molding a thermoplastic resin material using a pair of molds. After the production, before the thermoplastic resin material cools and hardens, the peripheral portion 104b of the bottom plate 104 on the outer side of the resin drum can 202 has two circumferential portions 261a and 261b as shown in FIG. The correction jig 260 is disposed. Two locations 261a and 261b correspond to the diameter positions 211a and 211b, respectively. Then, with the two locations 261a and 261b in contact with the outside of the bottom plate 104, the correction jig 260 is pressed toward the inside of the can. As a result, a liquid collection slope 213 is formed on the peripheral edge portion 104 b of the bottom plate 104.

In addition, in combination with the sixth embodiment and the fifth embodiment, as in the resin drum 203 shown in FIG. 15, the peripheral portion 104b of the bottom plate 104 has a non-projection region 141 at the parting line position 212, In addition, a resin drum can provided with the liquid collection slope 213 can also be produced.
Further, by combining the first embodiment with this embodiment, a resin drum can provided with the liquid collection inclined surface 213, the non-projection region 141, and the residual amount reduction convex portion 110 may be manufactured.

  In addition, it is possible to adopt a configuration in which the above-described embodiments are appropriately combined. With such a configuration, it is possible to obtain the respective effects exhibited by the combined embodiments.

  The present invention can be applied to a resin drum can, a composite container in which a resin interior container is loaded in an exterior container, and a method for manufacturing the resin drum can.

3. Containment,
101, 101-2, 101-3 ... resin drum, 102 ... discharge tube,
102a ... tip, 104 ... bottom plate, 104b ... peripheral edge part, 104c ... center part,
106a ... mouth part, 107 ... parting line, 107a ... projection,
110, 117 ... convex portions for residual amount reduction, 117a, 117b ... position restricting portions,
118: convex part for residual amount reduction, 118a ... central protrusion part,
131: convex portions for residual amount reduction, 141: non-projection regions,
150 ... Composite container, 151 ... Interior container, 152 ... Residual amount reducing convex part,
213 ... Slope for collecting liquid.

Claims (1)

A bottom plate, a cylindrical barrel rising from the outer periphery of the bottom plate, and a top plate that closes the upper end of the barrel are integrally formed, and the top plate has a mouth portion (106a) for discharging the contents. A barrel-shaped resin drum,
The bottom plate (104) has a concave portion formed in a concave shape at a position eccentric from the mouth portion, and the concave portion accommodates a residual container generated by discharging the container (3) from the resin drum can. ,
A discharge tube to be inserted into the resin drum through the mouth, and a discharge tube having a tip pressed against the boundary between the inner surface and the bottom surface of the recess;
A residual amount reducing convex portion having an inclined surface for guiding the tip of the discharge tube to the side of the residual container in the container;
A resin drum can further comprising:

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