JP4680976B2 - Bottle can body and bottle - Google Patents

Description

The present invention, and the bottle can member which have a screw portion for depositing the cap to the mouth section of the bottle can member, and to a bottle cap on the bottle can member is formed by deposition.

  A so-called bottle can body obtained by drawing a metal can body is formed with a base at the opening of the bottomed tubular can body, and a cap is attached to the outer periphery of the base. A thread portion is formed for this purpose.

  In order to produce a bottle can body having such a threaded portion, when a bottomed cylindrical bottle can body is formed in advance, the opening of the bottle can body, as shown in FIG. The diameter is once reduced to form the base part 2, and then the diameter is increased by a predetermined distance from the opening end of the base part 2 to form the enlarged diameter part 2 'as shown in FIG. The screw part 3 is formed at a certain distance from the opening end by a screw forming device as shown in FIG. In that case, when the screw part 3 is formed in the base part 2, the bulging part 4 is formed by leaving the enlarged diameter part in which the screw part 3 is not formed.

  Although the conventional screw forming apparatus is not shown in the drawing, a bottle can body while a core contacting the inner peripheral surface of the base part 2 and an outer core contacting the outer peripheral surface of the base part 2 sandwich the base part 2 with each other. The screw part 3 is formed on the outer periphery of the base part 2 by rotating around the center of the axis 1. In this case, the number of turns of the screw part 3 formed in the base part 2 is about 1.7 turns as shown in FIG. There exists a thing of patent document 1 as such a screw forming method.

Further, the bottle can body 1 in which the threaded portion 3 is formed is then subjected to various processes such as a curl caulking process for forming the curled portion 8 as shown in FIG. After the above process, when the contents are put inside, the cap 5 shown in the figure is attached and closed.
JP 2002-219539 A

  As described above, the conventional screw forming apparatus is configured such that the core that contacts the inner peripheral surface of the base portion 2 of the bottle can body 1 and the outer core that contacts the outer peripheral surface of the base portion 2 are sandwiched between each other. By rotating around the shaft center, a threaded portion 3 having a winding number of 1.7 is formed in the base portion 2 whose diameter has been increased.

  However, when the number of turns of the screw portion is about 1.7, as shown in FIG. 9, a portion having two screw portions 3 and a portion having only one screw portion 3 on the peripheral surface of the base portion 2 There was a problem with the difference in the number. That is, when the number of windings is the above, when the cap 5 is attached to the bottle can body 1 and the inside of the bottle can body 1 is set to a positive pressure, a pressure for pushing up the cap 5 is applied, and thus the cap 5 is displaced upward. . Therefore, since the cap 5 is biased with respect to the bottle can 1, the bridge 7 provided between the scores 6 and 6 on the opening end side of the cap 5 is pulled and broken, so-called bridge breakage occurs. There was a bug that happened.

  In order to solve the above problem, an attempt has been made to increase the number of turns of the screw part 3 to 2.2 as shown in FIG. When the screw part 3 of 2.2 turns is formed in the mouthpiece part 2 of the bottle can body 1 in this way, the screw part 3 is the first stage screw between the screw start part 3A and the screw end part 3B of the screw part 3. There will be a three-step thread region such as the thread 3a, the second thread 3b, and the third thread 3c.

  By the way, when the screw region 3 of 2.2 turns is formed on the bottle can body 1 and the above-described three-step screw thread region is formed, the curl caulking step is then performed on the tip of the base portion 2. When the curled portion 8 is formed, the curled portion caulking device forms the curled portion 8 while pressing the tip of the base portion 2 toward the bottom of the can.

  However, in this case, since the three-stage screw portion 3 is provided, the distance between the first-stage screw thread 3a and the curled portion 8 is short, and therefore, the first-stage screw thread 3a of the screw section 3 during the curl caulking process. Is pressed downward by the pressing force of the curl caulking device and is crushed. Therefore, as shown in FIG. 11, the first-stage screw thread 3a is radially expanded, and the second-stage screw thread 3b. It protrudes in the circumferential direction by the dimension Δ from the height of the third stage thread 3c.

  Thus, when the first stage screw thread 3a of the base part 2 is in a state of traveling in the circumferential direction, when the cap 5 is attached to the bottle can body 1 for closure, the cap 5 is attached to the base part 2. Since the cap 5 is attached in a shape corresponding to the shape, the cap 5 has a mortar-like shape having a smaller diameter on the opening end side than the diameter on the top plate side, as shown in FIG. The cap 5 is shown in a partially broken state in FIG.

  The cap 5 attached in such a mortar-like state is then removed from the bottle can body 1 for the user to drink, and the cap 2 is repeatedly closed when drinking is stopped. . However, if the diameter of the cap opening end side is smaller than the diameter of the top plate side, when the user closes, the resistance between the cap portion 2 and the cap 5 is large, and a large closing torque is required. As a result, there was a problem in handling.

The present invention has been made in consideration of such circumstances, and its purpose is to make all the screw portions of the base portion substantially equal without regard to the curl caulking process even if the number of turns of the screw portion is increased. it is to provide a bottle to bottle can member parallel beauty that can.

  In order to achieve the above object, the present invention proposes the following means.

The bottle can body of the present invention is formed by drawing a metal can body into a bottomed cylindrical shape, providing a base portion at the opening, and having a thread region composed of a plurality of steps on the outer periphery of the base portion. Ri Na provided a screw portion of the turns, the height of the first-stage screw thread in the threaded region of the threaded portion is a bottle can member which is formed lower than the height of the other stage of the thread in a predetermined angle range Then, after the curl portion is formed at the tip of the base portion, the first-stage screw thread has a height substantially equal to the other-stage screw thread .

According to the bottle can body according to the present invention, the height of the first stage screw thread provided in the base part is formed lower than the height of the other stage screw thread within a predetermined angle range. When the diameter is crushed by the pressing force and expanded, the height can be made substantially equal to the height of the other-stage thread.
In the bottle can body of the present invention, the predetermined angle range may be a range of at least 90 degrees from a screw start portion of the screw portion.

In addition, the bottle can body of the present invention is formed by drawing a metal can body into a bottomed cylindrical shape, providing a base portion at the opening, and on the outer periphery of the base portion from the front end side of the base portion. Ri Na provided a screw portion of the turns having a threaded region formed of a plurality of stages toward the can bottom direction, in the region except for the incomplete thread portion of the region and the threaded end portion that overlaps a plurality of stages, and the screw The height of the first stage thread of the part is a bottle can body formed lower than the height of the second stage thread , and after forming the curled part at the tip of the base part, the first stage screw The crest has a height substantially equal to the other-stage thread .

  According to the bottle can body according to the present invention, since the height of the first stage thread is formed lower than the height of the second stage thread, when the diameter is crushed by the pressing force by the curl caulking process, The height of the thread can be made substantially the same.

The bottle of the present invention comprises a bottle can body in which the curled portion is formed in the base portion of the bottle can body according to any one of claims 1 to 3 , and a cap attached to the base portion of the bottle can body. It is characterized by providing.

  According to the bottle of the present invention, since the screw part provided in the base part has a substantially uniform thread height over the periphery, the cap may be displaced due to the positive pressure in the bottle can when the cap is attached. In addition, there is no fear that the bridge breaks, and a good bottle that can be smoothly attached to the cap can be obtained.

According to the first aspect of the present invention, the height of the first stage screw thread provided in the base portion is formed lower than the height of the other stage screw thread within a predetermined angle range. The effect that the height can be made substantially the same as the height of is obtained.
By making the height of the first stage thread lower than the other stage thread in the range of 90 degrees from the screw start of the threaded part, the first stage thread can be secured in a range where the thread is crushed and expanded in diameter. The effect that can be covered is obtained.

According to the invention which concerns on Claim 3 , the effect that the height of each screw thread can be made into substantially the same height is acquired.

According to the invention which concerns on Claim 4 , there exists an effect by which the favorable bottle which can perform the deposition of a cap smoothly can be obtained.

  Embodiments of the present invention will be described below with reference to the drawings. 1 to 6 are views showing a base part forming method according to an embodiment of the present invention. FIG. 1 is an explanatory view showing a screw forming apparatus for performing the base part forming method, and FIG. FIG. 3 is an explanatory view showing a state in which the forming device forms a screw portion in the cap portion of the bottle can body, FIG. 3 is an external view showing the core of the screw forming device, and FIG. 4 is a view of the screw forming portion in the core of FIG. FIG. 5 is an enlarged view, FIG. 5 is a view corresponding to the arrow A in FIG. 3, and FIG.

  Before explaining the base part forming method of this embodiment, the bottle can body 1 handled by this base part forming method is for putting contents such as carbonated drinks and fruit juice drinks inside, and is made of aluminum or aluminum. After being formed into a bottomed cylindrical shape by a thin metal plate made of an alloy, a base part 2 having a diameter smaller than that of the can body is formed at the opening of the bottle can body 1, and then a screw forming device 10 around the base part 2. Thus, the thread portion 3 is formed (see FIG. 8).

  The screw forming apparatus for carrying out the base part forming method is roughly divided into a core 11 that is in contact with the inner peripheral surface of the base part 2 of the bottle can 1 and an outer member that is in contact with the outer peripheral surface. 12 (outer body), and the screw part 3 is formed around the base part 2 by rotating around the axis O of the bottle can body 1 while sandwiching the base part 2 between the core 11 and the outer core 12. It is supposed to be formed.

  As shown in FIGS. 1 and 2, the core 11 and the outer core 12 are formed so that concave and convex screw forming portions 21 and 22 for forming the screw portion 3 on the outer peripheral surface thereof are spiral and correspond to each other. Each can is formed in a shape and is moved in the radial direction by cam rollers C1 and C2 that move in the radial direction in accordance with the position of the second housing 42 with respect to the first housing 41. The base part 2 of the body 1 can be sandwiched so as to be deformed so as to form the screw part 3.

  The core 11 and the outer core 12 are provided inside the second housing 42. The second housing 42 is biased and held on the front end side with respect to the first housing 41 and fixes the third housing 44. A holding ring 47 is attached to the third housing so as to be rotatable about the axis O. An elastic member 46 that is biased toward the distal end side via a spring 45 is attached to the holding ring 47. The elastic member 46 has a conical surface 46a along the tapered shoulder portion formed on the bottle can body 1 and a cylindrical surface 46b along the can body portion, and the screw forming apparatus 10 advances relative to the bottle can body 1. When pressed, it is pressed against the bottle can 1.

  In FIGS. 1 and 2, reference numeral 35 denotes a stopper member fixed to the work holding unit 30 side. A third ring in which the pressing ring 47 is fixed by contacting the pressing ring 47 with the stopper member 35. The axially most advanced positions of the housing 44, the second housing 42, and the core 11 and the outer core 12 provided on the inside thereof with respect to the work holding portion 30 are determined.

  The work holding unit 30 is not shown in detail, but a die ring 31 that holds the bottle can 1 by fitting the bottom of the bottle can 1 and the can body of the bottle can 1 that is expanded by air. The ring-shaped hollow elastic member 32 that tightens and holds the chuck functions.

  As shown in FIG. 1, when the bottle can body 1 whose bottom is held in advance by the die ring 31 of the workpiece holding unit 30 is positioned at an opposing position, the screw forming device 10 firstly has a workpiece holding unit. The cylindrical surface 46b is fitted into the can body portion from the shoulder portion of the bottle can body 1 by the advance of 30, and then the work holding portion 30 is further advanced so that the holding ring 47 contacts the stopper member 35, and the second housing 42 and Advancement of the third housing 44 is stopped, and the work holding unit 30 is further advanced to narrow the axial interval between the first housing 41 and the second housing 42.

  At this time, as the first housing 41 moves forward to a predetermined position as shown in FIG. 2, the first housing 41 moves relative to the second housing 42, and the cam rollers C1 and C2 are inclined surfaces 41a and 41b of the first housing. And the core 11 moves and contacts the inner peripheral surface of the base portion 2 of the bottle can body 1, and the outer core 12 moves and contacts the outer peripheral surface of the base portion 2. As a result, the base part 2 is sandwiched between the core 11 and the outer part 12, and the entire apparatus 10 further rotates around the axis O in this state, so that the screw part 3 is formed in the base part 2. ing.

  In that case, the screw part 3 formed in the cap part 2 of the bottle can 1 is formed with a winding number of 2.2 in this example. As shown in FIG. 3, the screw portion 3 having two turns is a screw thread composed of three stages of a first-stage thread 3 a, a second-stage thread 3 b, and a third-stage thread 3 c on the outer peripheral surface of the base part 2. A region L exists. Therefore, the uneven thread forming portion 21 provided in the core 11 is formed in a shape corresponding to the thread portion 3 as shown in FIG.

  In this embodiment, when the screw portion 3 is formed with respect to the outer periphery of the base portion 2, the first-stage screw thread 3a is slightly slightly ahead of the height of the second-stage screw thread 3b and the third-stage screw thread 3c as shown in FIG. It is formed with a low dimension Δ.

  That is, as shown in FIG. 4, in the screw forming portion 21 of the core 11, the height of the first-stage screw forming portion 21a is slightly lower than that of the second-stage screw forming portion 21b and the third-stage screw forming portion 21c. When the screw part 3 is formed in the base part 2 of the bottle can body 1 by the core 11 and the outer core 12 by this, as shown by a solid line in FIG. The first-stage screw thread 3a on the part 3A side is previously formed lower by a dimension Δ than the second-stage screw thread 3b and the third-stage screw thread 3c.

  In this case, as Δ, for example, when a thread height of 0.8 mm is set as a set value, the value is about 0.1 mm lower than that, and therefore is about 0.7 mm. It is preferable to do this.

  Further, in the screw forming portion 21 of the core 11, the range in which the first-step screw forming portion 21a is lower than the second-step screw thread 3b and the third-step screw thread 3c is as shown in FIG. In addition, the angle range α is 90 degrees including the thread region L. In this case, the screw start portion 21A of the first-stage screw forming portion 21a is set to 0 degree, and the angle range α is 90 degrees in the screw direction therefrom.

  However, not only in the range of 90 degrees, but considering the change in the number of turns of the screw part 3 and the area where the thread may be crushed, it is generally preferable that the angle range is up to 180 degrees, and more preferable. Is an angle range of 100 to 140 degrees (α1).

  The screw start portion 21A of the screw forming portion 21 is a portion where the screw portion 3 formed on the base portion 2 functions effectively as a screw, and corresponds to the screw start portion 3A of the screw portion 3. Accordingly, the screw end portion 21B and the screw end portion 3B of the screw portion 3 are also in conformity thereto.

  1 to 6, the same parts as those in FIGS. 8 to 11 are denoted by the same reference numerals.

  Since the screw forming apparatus 10 is configured as described above, an embodiment of the method of the present invention will be described in relation to the operation thereof.

  First, since the screw part 3 is provided in the bottle can body 1, as shown in FIG. 1, the bottle can body 1 with the bottom held by the work holding part 30 including the die ring 31 and the ring-shaped hollow elastic member 32 is opposed. The cylindrical surface 46b is fitted into the can body portion from the shoulder portion of the bottle can body 1 by the advance of the work holding portion 30, and then the work holding portion 30 is further advanced and the holding ring 47 is stopped by the stopper member 35. , The advance of the second housing 42 and the third housing 44 is stopped, the work holding part 30 further advances, and the axial interval between the first housing 41 and the second housing 42 is narrowed.

  At this time, as the first housing 41 moves forward to a predetermined position as shown in FIG. 2, the first housing 41 moves relative to the second housing 42, and the cam rollers C <b> 1 and C <b> 2 are inclined surfaces 41 a of the first housing, As the core 11 is moved along 41b, the core 11 is moved and brought into contact with the inner peripheral portion of the base portion 2 of the bottle can body, and the outer core 12 is moved and brought into contact with the outer peripheral portion of the base portion 2 as a result. The base part 2 is sandwiched between the core 11 and the outer part 12, and the entire device further rotates around the axis O in this state, so that the screw part 3 as shown by a solid line in FIG. Will be formed.

  In that case, if the screw portion 3 of 2.2 turns is formed along the outer peripheral surface of the base portion 2 by the rotation of the core 11 and the outer core 12, the height of the first-step screw forming portion 21a of the core 11 is two. Since the stepped screw forming portion 21b and the third stepped screw forming portion 21c are lower than each other, the first-step screw thread 3a is the second-step screw thread 3b and the third-step screw screw 3b. It is formed lower than each height of the thread 3c.

  After the screw part 3 is formed on the outer periphery of the base part 2 in this way, a curl caulking process is performed by a curl caulking device (not shown) in order to provide the curl part 8 at the tip of the base part 2 having the screw part 3. The curl caulking device folds the tip of the base part 2 from the outside to the inside while pressing the bottle can body 1 toward the bottom of the can to form the curl part 8 (FIGS. 9 and 11). By receiving the pressing force, the first-step screw thread 3a in the base portion 2 is crushed, and the first-step screw thread 3a is expanded from the solid line in FIG. 6 to a chain line.

  In this case, as described above, the first-stage screw thread 3a in the base portion 2 is formed with a dimension Δ that is lower than the height of the second-stage screw thread 3b and the third-stage screw thread 3c. Even if the diameter is expanded by being crushed by the pressing force, the height is substantially the same as that of the second-stage screw thread 3b and the third-stage screw thread 3c.

  Therefore, according to the present invention, when the first-step screw thread 3a in the screw portion 3 of the base portion 2 is formed low in advance and then a pressing force is applied to the tip of the base portion 2 by a curl caulking process, Since the height of the first-stage screw thread 3a can be made substantially equal to the heights of the second-stage screw thread 3b and the third-stage screw thread 3c with the pressing force, the screw threads can be made substantially uniform.

  Therefore, when the cap 5 is attached to such a bottle can body 1, the cap 5 has a straight bottomed cylindrical shape having substantially the same diameter on the top plate side and the opening end side. When closing the can body 1 after opening it, it can be smoothly closed so that it does not give a sense of incongruity, and the problem of forming a mortar-shaped cap as in the past can be solved, and the reliability is increased accordingly. Can be increased.

  According to the screw forming apparatus 10, the height of only the first-step screw forming portion 21a in the core 11 is made lower than the other screw-forming portions 21b and 21c, so that the first step in the screw portion 3 of the base portion 2 is achieved. The screw thread 3a can be formed low in advance, and the screw part 3 that makes the cap closed well can be formed accurately.

  FIG. 7 is a diagram showing a second embodiment of the present invention, and is an enlarged explanatory view of a main part showing a screw portion provided in a cap part of a bottle can body.

  When the screw part 3 of 2.2 turns is formed in the cap part 2 of the bottle can body 1, the thread is two steps in the region excluding the three-step screw region.

  In this embodiment, the screw portion 3 in such a two-step region is also taken into consideration, and the height of the first stage thread 301 is formed lower than the height of the second stage thread 302. Has been.

  That is, the first stage thread 301 is in a region excluding the three-stage overlapping region (L) and the incomplete thread at the end of the screw, and the height thereof is determined by the second stage thread 302. It is formed lower by the dimension Δ. Therefore, according to the height, the screw forming portion 21 of the core 11 of the screw forming apparatus 10 is formed according to the height of the screw threads 301 and 302.

  According to this embodiment, since the height of the first-step screw thread 301 is formed lower than the height of the second-step screw thread 302, the first step screw thread 301 is crushed by the pressing force by the curl caulking process and expanded in diameter. The eye thread 301 can be set to a height substantially equal to the height of the second stage thread 302.

  In the illustrated embodiment, an example in which the screw forming device 10 forms the 2.2 screw portions 3 on the base portion 2 of the bottle can 1 is shown. However, when the number of turns is increased further, for example, 2.5 The present invention can also be applied to a case where the number of turns is such as a winding, and is not limited to the illustrated embodiment.

  In the illustrated embodiment, the example in which the screw forming apparatus 10 uses the outer core 12 that rotates around the axis O together with the core 11 while being in contact with the outer periphery of the base portion 2 is shown. As an alternative, another outer body capable of forming the screw portion 3 together with the core 11 may be used, and the present invention is not limited to the illustrated example.

It is explanatory drawing which shows the screw forming apparatus for implementing this invention. It is explanatory drawing which shows the state in which the screw-forming apparatus forms the thread part in the nozzle | cap | die part of a bottle can body. It is an external view which shows the core of a screw forming apparatus. It is an enlarged view of the screw formation part in the core of FIG. It is a figure similarly equivalent to A arrow of FIG. It is explanatory drawing which shows the state which formed the thread part in the nozzle | cap | die part of a bottle can body. It is a figure which shows 2nd embodiment of this invention, Comprising: It is an expanded explanatory view of the principal part which shows the screw part provided in the nozzle | cap | die part of a bottle can body. It is explanatory drawing which shows the process until it forms a thread part in a bottle can body. It is explanatory drawing which adheres a cap to the bottle can body which has a thread part. It is explanatory drawing when the screw part of 2.2 volume is provided in the nozzle | cap | die part of the bottle can body. It is explanatory drawing which shows the conventional problem which arose in the thread part of the bottle can.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Bottle can body 2 Cap part 3 Thread part 3a, 301 1st stage thread 3b, 302 2nd stage thread 3c 3rd stage thread 3A Screw start part 3B Screw end part 10 Screw forming device 11 Core 12 Outer core ( Outer body)
21 Core thread forming part 21a First stage thread forming part in core thread forming part

Claims (4)

  A metal can body is drawn and formed into a bottomed cylindrical shape, and a base is provided in the opening, and a screw part having a number of turns having a plurality of thread regions on the outer periphery of the base is provided. ,
  The height of the first stage thread in the thread region of the thread portion is a bottle can body formed lower than the height of the other stage thread in a predetermined angle range,
  The bottle can body according to claim 1, wherein after the curl portion is formed at the tip of the base portion, the first-stage screw thread has a height substantially equal to the other-stage screw thread. Before SL predetermined angular range, from the thread-starting portion of the threaded portion, the bottle can member according to claim 1, wherein the range of at least 90 degrees.   A metal can body is drawn and formed into a bottomed cylindrical shape, and a base is provided at the opening, and a screw having a plurality of steps on the outer periphery of the base from the tip of the base toward the bottom of the can It is provided with a thread part with the number of turns having a mountain area,
  In the area excluding the overlapping area and the incomplete thread at the end of the screw,
And the height of the thread of the first stage of the screw part is a bottle can body formed lower than the height of the thread of the second stage,
  The bottle can body according to claim 1, wherein after the curl portion is formed at the tip of the base portion, the first-stage screw thread has a height substantially equal to the other-stage screw thread.   A bottle can body in which the curl portion is formed in the base portion of the bottle can body according to any one of claims 1 to 3, and a cap attached to the base portion of the bottle can body. Bottle.