JP2019085150A - Manufacturing method of cap - Google Patents

Abstract

To manufacture a cap on which a sheet type (plate-like) cap liner is mounted efficiently and economically while suppressing the generation of sheet chips when such a cap liner is formed.SOLUTION: A cylindrical or columnar liner material P is produced by extrusion molding of a resin material W, and the liner material P is cut perpendicularly to the longitudinal direction of the liner material P to produce a plate-shaped cap liner L, and this cap liner L is mounted on the inner surface of the top plate part of the cap body made of metal, which is of a cylindrical shape with a bottom having a top plate part and a peripheral wall part.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a method of manufacturing a cap attached to the mouth of a container such as a bottle can.

  As a cap attached to such a bottle can etc., for example, Patent Document 1 discloses a cap main body having a disc-like top plate portion and a peripheral wall portion substantially hanging down from the periphery of the top plate portion, and the cap main body In a cap material provided with a sheet type liner disposed along the inner surface of the top plate portion, the liner is made of an elastomer and has a sealing layer having a sealing function and hardness higher than this sealing layer. There is described that a sliding layer which slides on the inner surface of the disc portion is laminated. Moreover, this patent document 1 also describes punching and forming the liner.

Unexamined-Japanese-Patent No. 2007-119059

  However, as described in this patent document 1, when the liner is stamped and formed, sheet scraps (edges) of the sheet-like liner material are generated after the stamped and formed. Here, Patent Document 1 describes that such sheet waste after punching is reused as a raw material of the sliding layer, but in order to reuse the sheet waste in this manner, the sheet may be used. The waste must be crushed and then re-sheeted, which is inefficient and uneconomical.

  The present invention has been made under such a background, and there is no generation of sheet waste when forming a sheet type (plate-like) cap liner, and such a cap liner can be efficiently and economically produced. It is an object of the present invention to provide a method of manufacturing a cap capable of manufacturing a cap attached thereto.

  In order to solve the above-mentioned problems and achieve such an object, the present invention produces a tubular or columnar liner material by extrusion of a resin material, and this liner material is used in the longitudinal direction of the liner material. Cut vertically to produce a plate-like cap liner, and the cap liner is attached to the inner surface of the top plate of the cylindrical metal cap body with a bottom having a top plate and a peripheral wall. It is characterized by

  In such a cap manufacturing method, since the cap liner is manufactured in a plate shape by cutting the cylindrical or columnar liner material manufactured by extrusion perpendicularly to the longitudinal direction, the sheet is formed like a punched sheet. There is no generation of scrap after punching out the liner material. For this reason, it is not necessary to crush and re-sheet in order to reuse scraps, and it is possible to manufacture a cap liner without excess cylindrical or columnar liner material obtained by extruding a resin material, so efficiency And economical.

  Also, the liner material is selected to be flexible to ensure sealing, but the flexible material is often easy to adsorb useful components such as flavor components contained in the beverage, and the material used It is desirable that the area and volume of In the conventional punching and forming, the cap liner is also present at the central portion of the top plate portion of the cap body which does not contribute to sealing, and adsorption of flavor components and the like has been an issue. By manufacturing the plate-like cap liner by cutting, the use area and volume of the cap liner can be reduced while avoiding the presence of the cap liner at the central portion of the top plate.

  Here, in order to attach the cap liner thus manufactured to the cap body, the cap liner may be attached by welding or adhering to the inner surface of the top plate portion of the cap body. In particular, when the cap liner is attached by welding, the metal cap body is heated to melt the side surface of the cap liner facing the top plate side of the cap body, and the cap liner is removed by heating the cap liner. It is efficient to weld and attach to the inner surface of the top plate portion of the main body.

  As described above, according to the present invention, a cap liner can be manufactured and attached to a cap without generating scraps of a sheet-like liner material, and crushing or recycling of scraps can be performed. The need for re-sheeting is also eliminated, and efficient and economical cap production can be promoted.

FIG. 5 illustrates the process of manufacturing a cap liner in an embodiment of the present invention. It is a figure which shows the state which made the liner retainer face the cap liner at the process of mounting | wearing a cap liner with a cap main body after the process shown in FIG. It is a figure which shows the state which hold | maintained the cap liner by the liner holder from the state shown in FIG. It is a figure which shows the state which inserts a cap liner into a cap main body from the state shown in FIG. It is a figure which shows the state which inserts and mounts a cap liner in a cap main body from the state shown in FIG.

  1 to 5 show an embodiment of the present invention. In this embodiment, first, as shown in FIG. 1, a cylindrical or columnar liner material P is manufactured by extrusion of a resin material W, and the liner material P is cut perpendicularly to the longitudinal direction of the liner material P. A plate-like cap liner L is manufactured. Specifically, in the present embodiment, the cylindrical liner material P is manufactured and cut perpendicularly to the longitudinal direction with a constant thickness in the longitudinal direction, to manufacture the thin ring-shaped cap liner L.

  In FIG. 1, reference numeral 1 denotes an extruder for the liner material P. The extruder 1 heats and melts the resin material W, which is the material, and extrudes the molten resin material W. An extrusion means (not shown) such as a screw that continuously extrudes toward the port 2 and a core shaft 3 inserted into the extrusion port 2 are provided. The inner peripheral surface of the extrusion port 2 is circular in cross section, and the outer peripheral surface of the core shaft 3 is circular in cross section smaller than the inner peripheral surface of the extrusion port 2, and the liner material P manufactured by extrusion is long It is cylindrical as described above continuous in the direction.

  The continuous liner material P thus extruded is cooled by the water cooler 4 or the like and then taken out and fed out by the conveyor-like take-out device 5 and cut in the longitudinal direction by the cutting device 6. This cutting machine 6 has a cutting blade 6C attached to the end of a rotary shaft 6B of a rotary drive machine 6A such as a motor, and the cutting blade 6C has its liner material P elongated as the rotary shaft 6B rotates. Crossing in the direction perpendicular to the direction, the liner material P is cut to produce the thin ring-shaped cap liner L as described above. The thickness of the cap liner L can be adjusted by the rotational speed of the rotating shaft 6B and the delivery speed of the liner material P by the take-up device 5. Alternatively, the liner material P may be cut into a thin plate-like cap liner L in a separate step after being taken and cut to a certain length.

  The cap liner L manufactured by cutting from the liner material P in this way is aligned after being stocked to a certain number, held by the liner holder 7 one by one and conveyed, and the top plate portion Ca and the peripheral wall portion Cb In the cylindrical form having a bottom, and is inserted into a metal cap body C made of aluminum, aluminum alloy or the like, and mounted on the inner surface of the top plate portion Ca of the cap body C. The lower end portion holding the cap liner L of the liner holder 7 has a cylindrical shape having an outer diameter larger than the outer diameter of the cap liner L and smaller than the inner diameter of the peripheral wall Cb of the cap body C. The lower end surface of the cover 7 is formed with a circular recess 7A having a diameter slightly larger than the outer diameter of the cap liner L and having a depth smaller than the thickness of the cap liner L and coaxial with the liner holder 7.

  Further, inside the liner holder 7, suction holes 7B are bored from the upper end along the center line of the circular column formed by the liner holder 7. The suction holes 7B are plurally formed at the lower end of the liner holder 7. It branches to extend to the outer peripheral side as it goes to the lower end side, and opens in the range of the radial width of the cap liner L at the outer peripheral edge of the bottom surface facing the lower end side of the recess 7A. Such a liner holder 7 faces the annular surface of the cap liner L in which the bottom surface of the recess 7A is placed flat and aligned as shown in FIG. 2, and the liner holder 7 is lowered and the recess 7A is lowered. Cap liner L is held by accommodating cap liner L therein and sucking air through suction hole 7B.

  Thus, the liner holder 7 holding the cap liner L is lifted and conveyed as shown by the arrow in FIG. 3, and coaxially on the cap body C supported with the opening facing upward as shown in FIG. As shown by the arrow in FIG. 4, the cap liner L is inserted into the cap body C and brought into contact with the inner surface of the top plate portion Ca. At this time, in the present embodiment, the cap body C is heated to a temperature at which the cap liner L can be welded. Specifically, in the present embodiment, as shown in FIG. 4 and FIG. 5, particularly the top plate portion of the cap main body C by the induction heating coil 8 disposed at a distance from the outer surface of the top plate portion Ca of the cap main body C. Ca is heated.

  As a result, the side surface of the cap liner L facing the top plate portion Ca melts, whereby the cap liner L is welded to the inner surface of the top plate portion Ca and mounted on the cap body C, whereby the cap is manufactured. The cap thus manufactured is conveyed after the suction by the liner holder 7 is released and the liner holder 7 is extracted, and the cap is attached to the mouth of a container such as a bottle can filled with the contents and the mouth Seal the part.

  As described above, in the method of manufacturing the cap having the above-described configuration, the plate-like liner material is not stamped and formed, but the cylindrical liner material P is extruded and formed, and the plate is cut perpendicularly to the longitudinal direction. Since the cap liner L of the shape like is manufactured, the scrap of a sheet-like liner material does not occur like punching molding. For this reason, there is no need to carry out crushing or re-sheeting in order to reuse scraps, and it is possible to manufacture the cap liner L without excess liner material P molded from the resin material W, which is efficient. Yes, it is also economical.

  In particular, in the present embodiment, the annular liner thin plate-like cap liner L is manufactured by manufacturing the cylindrical liner material P and cutting it at a constant thickness in the longitudinal direction, as shown in FIG. With the cap liner L attached to the inner surface of the top plate portion Ca of the cap C, the presence of the cap liner L at the central portion of the inner surface of the top plate portion Ca can be avoided. For this reason, both the use area and volume of a cap liner can be made small, and even if the liner material P has flexibility, it becomes possible to suppress adsorption of useful ingredients such as flavor ingredients.

  Furthermore, in the present embodiment, the cap liner L thus manufactured is attached to the inner surface of the top plate portion Ca of the cap main body C by welding. Moreover, at the time of this welding, by heating the metal cap body C, the side surface of the cap liner L facing the top plate portion Ca side of the cap body C is melted, and the cap liner L is It is efficient because it is welded to the inner surface of the In particular, in the present embodiment, the cap main body C is heated by induction heating, and the heating rate until the cap main body C is raised to a temperature at which the cap liner L can be welded is fast.

  However, in the present embodiment, although the cap liner L is attached to the inner surface of the top plate portion Ca of the cap main body C by welding in this manner, the cap liner L is adhered to the paint applied to the inner surface of the top plate portion Ca of the cap main body C In some cases, the cap liner L may be attached. In this case, when the resin material W extruded into the liner material P and manufactured into the cap liner L is, for example, an elastomer containing polypropylene as a material, a polypropylene-based wax is used as a paint to be applied to the inner surface of the top plate portion Ca. It is desirable to use a paint containing a component that adheres to the cap liner L, such as a paint containing a polypropylene adhesive component such as

  Further, in the present embodiment, the liner material P is extruded into a cylindrical shape to manufacture the annular plate-like cap liner L. For example, a cylindrical liner material may be produced by the extrusion molding machine 1 not provided with the core shaft 3 It is also possible to produce a disc-like cap liner L by extruding P and cutting it perpendicularly to the longitudinal direction. Furthermore, the liner material P other than the cylindrical or cylindrical shape is extruded by changing the inner and outer surface shapes of the extrusion port 2 of the extrusion molding machine 1 and the core shaft 3 to form a ring other than the annular plate or disk. The cap liner L can also be manufactured.

  Furthermore, in the present embodiment, although the cap liner L has a single-layer structure, for example, the liner material P molded by separate extrusion molding steps is cut to manufacture a plurality of plate-like cap liners L. And a sealing layer described in Patent Document 1 and a sliding layer harder than the sealing layer disposed between the sealing layer and the top plate portion. A cap liner of construction may be made. In this case, both the sealing layer and the sliding layer may have a disk shape, or, for example, the sliding layer may be in the form of a disk and the sealing layer may be in the form of an annular plate.

1 Extruder 2 Extruder 3 Core shaft 4 Cooler 5 Drawer 6 Cutting machine 7 Liner holder 8 Induction heating coil W Resin material P Liner material L Cap liner C Cap body Ca Top plate Ca Cb Peripheral wall

Claims (3)

Produces cylindrical or columnar liner material by extrusion of resin material,
The liner material is cut perpendicularly to the longitudinal direction of the liner material to produce a plate-like cap liner.
A method of manufacturing a cap, comprising attaching the cap liner to an inner surface of the top plate portion of a bottomed cylindrical metal cap body having a top plate portion and a peripheral wall portion.   The method for manufacturing a cap according to claim 1, wherein the cap liner is attached to the inner surface of the top plate of the cap body by welding or bonding.   The method for manufacturing a cap according to claim 1, wherein the cap liner is attached by welding to the inner surface of the top plate portion of the cap body by heating the cap body.

Images