JPS5881527A - Fastening method for end member - Google Patents

Abstract

PURPOSE:To fasten an end member to an open end firmly by inserting an outwardly bent part formed on an open end of the shell of a container into an annular formed part formed outside of the periphery of panel part of an end member, bending the outer wall of the annular part to upper inside, and sticking it close to the shell of the container. CONSTITUTION:After inserting the upper open end of the shell 7 of a container into an annular formed part 6 so that the curled part 4 of an end member 1 and the outwardly curved part 8 of the shell 7 of the container are opposed to each other, it is placed on a lifter plate 10. Then, the shell 7 is raised by rotation of a drive gear 11, and the inner wall 3 and curled part 4 of the end member 1 are engaged with the side peripheral face 17a of lower projection 17 of a fixed chuck 15 and an annular groove 16 respectively. While the curled part 4 and groove 16 are being engaged, a curling plate 18 is raised, and outside 5 of the end member 1 is bent to upper inside along the curling groove 19, and inserted to inside of curved part 8 to fasten the end member 1 and shell 7. The plate 18 is then lowered, and moved outward radially, and the shell 7 to which the end member 1 is fastened is lowered to orginal position.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for securing an end member, and more particularly to a method for securing an end member such as a lid or a bottom to an open end of a container body.

Conventional methods for fixing an end member to the open end of a container body include a double seaming method and a heat sealing method.

In the generally adopted double seaming method, first the curled portion of the end member and the flank portion of the container body are pre-sealed using a first seaming roll, and then pre-sealed using a second seaming roll. This is done by pressing the part in the easy direction to form a double seam part. In this case, especially in the preliminary seaming process, to support the axial component force applied to the flange to prevent the flange from escaping and to secure a biddy hook of the specified length (see Figure 1 (c) 33). In this case, a large axial load (e.g. 120 to 200 K9) must be applied to the container body by a lifter, and therefore the container body made of a low-rigidity material with low axial load strength is
If an attempt was made to tighten the container tightly, there was a problem in that the body of the container would buckle, making it impossible to obtain a satisfactory can.

Therefore, the thickness of the container body must be set to a predetermined value (for example, approximately 0.1 ttan for steel such as tin-plated steel plate, approximately 0.13 ttan for aluminum alloy) due to constraints from the axial load applied during double seaming. rran) (even if it is made thinner than the above specified value, problems such as permanent deformation due to external forces such as external impacts are unlikely to occur, for example, in the case of sealed cans where the internal pressure is higher than atmospheric pressure) ), it has therefore been difficult to reduce the cost by reducing the thickness of the container body. For the same reason, low-rigidity plastics,
It has been difficult to apply the double seaming method to a container body made of paper or a laminate thereof (including a laminate with metal foil). Therefore, although double-sealed parts have excellent reliability in airtightness and still have the advantage of increasing container strength, double-sealed parts are not suitable for the above-mentioned part of the container body. The problem was that the law was difficult to apply.

The method of heat-sealing a flat end member to a flange that still extends radially outward can also be applied to a container body with low rigidity, but it is particularly important to Pin holes are likely to occur due to moisture in the adhered contents, making it difficult to obtain a completely airtight heat-sealed part. Further, the heat-sealing portion cannot be expected to improve the strength of the container, and there is a problem in that it cannot be applied to the container body and end members that do not yet have a heat-sealable layer.

It is an object of the present invention to solve the problems of the prior art described above.

In order to achieve the above object, the present invention provides a method for fixing an end member to an open end of a container body made of a low-rigidity material. An annular molded part is formed, which includes a curled part connected to the upper end, and an outer wall that hangs down from the lower end of the curled part, an outer curved part having a shape substantially corresponding to the curled part is formed at the open end, and the outer side The open end is inserted into the annular molded part so that the curved part and the curled part are in contact with each other, and the outer wall is bent inwardly and upwardly so as to be in close contact with the part of the container body (5) that is in contact with the inner wall. The present invention provides a method for fixing an end member to a container body.

Furthermore, the present invention provides a method for fixing an end member to an open end of a container body made of a low-rigidity material, in which the end member includes an inner wall that rises almost perpendicularly from the periphery of the panel portion, and a curl that connects to the upper end of the inner wall. forming an annular molded part consisting of an outer wall hanging down from the lower end of the curled part, forming an outer curved part and a hanging part at the open end of the shape roughly corresponding to the curled part and the outer wall, respectively; The open end is inserted into the annular molded part so that the outer curved part and the curled part, and the hanging part and the outer wall are in contact with each other, and the outer wall and substantially the lower half of the hanging part are simultaneously pushed inward and upward. The present invention provides a method for fixing an end member to a container body, characterized in that the end member is bent and brought into close contact with the container body portion that abuts the inner wall.

The present invention also provides a method for fixing an end member to an open end of a container body made of a low-rigidity material, in which an inner wall rising approximately perpendicularly from the peripheral edge of the flannel portion, and an upper end of the inner wall are attached to the end member. Connecting Curled Parts, C6 of the Curled Parts) An annular molded part consisting of an outer wall hanging down from the lower end is formed, and the upper half has a shape approximately corresponding to the curled part at the open end. forming an annular part, inserting the open end into the annular molded part so that the upper half of the outer annular part and the curled part are in contact with each other, and bending the outer wall inward;
The present invention provides a method for fixing an end member to a container body, characterized in that the end member is brought into close contact with the lower half of the outer annular portion.

The present invention will be described below with reference to the drawings.

1 and 2, reference numeral 1 denotes an end member, which includes an inner wall 3 rising almost perpendicularly from the periphery of the iR flannel portion 2, a curled portion 4 connected to the upper end of the inner wall 3, and a lower end of the curled portion 4. An annular molded part 6 (on the inner surface of which a not-shown sealing mound layer is normally formed) is formed on the periphery, and is made up of an outer wall 5 that hangs down. The end member 1 is made of a metal plate (for example, a tin-plated steel plate of normal thickness, tin-free steel,
or aluminum alloy plate, etc.), or a laminate of plastic film and metal foil or sheet (e.g. outer layer:
Polyethylene film (thickness 50-100 μm), middle layer Nialuminum foil (thickness 50-200 μm), inner layer:
It is formed from a polyethylene film (50 to 100 μm thick) or the like by press molding or the like. Reference numeral 7 denotes a container body, and an outer curved portion 8 having a shape substantially corresponding to the curled portion 4 is formed at the open end thereof. Shapes that roughly correspond to this include cases where the lower end 8a of the outer curved portion 8 extends to a position corresponding to the upper part of the outer wall 5, and cases where the lower end 8a of the outer curved portion 8 extends to a position corresponding to the upper part of the outer wall 5,
This is to include cases where a ground layer is present.

The container body 7 is made of a material with low rigidity. Low rigidity here refers to the lift pressure (approximately 1
20 to 200 kg) to cause buckling. Such low-rigidity materials vary depending on the diameter and height of the can body, but examples include tin-plated steel sheets that are thinner than 010, tin-free steel (electrolytic chromic acid treated steel sheets), and thin aluminum alloys that are thinner than 013Wan. , or a relatively thin plastic sheet or a laminate mainly composed of it, or a laminate of paper material, plastic film, metal foil, etc. (for example, outer layer: polyethylene film (thickness 50 to 100 μm), intermediate layer Nialuminum foil, etc.) (thickness 9 to 100 μm), inner layer: polyethylene film (thickness 50 to 100 μm)). After forming a straight cylindrical body by joining the opposing edges of such a blank made of a low-rigidity material by gluing, welding, or soldering, the outer edges of the blank are formed at both open ends by, for example, spinning. By forming the curved portion 8, the container body 7 is formed. Alternatively, when the container body 7 has a main layer of thermoplastic glass, the outer curved portion 8 can be formed by a curling device 40 shown in FIG. 5, which will be described later. Although not shown in the figure, the container body 7 is
The outer curved portion 8 may be formed at the open end of a so-called seamless can body formed by drawing and tightening a metal plate.

Next, an example of a method for fixing the end member 1 to the open end of the container body 7 using the apparatus shown in FIGS. 2 and 3 will be described.

(9) A lifter plate 10 is configured to be movable up and down via a drive gear 11, a lifter cam 12, and a cam follower 13, which are rotated by a drive device (not shown). Note that 14 is a bearing. Reference numeral 15 denotes a fixed chuck, which includes an annular group 16 shaped to correspond to the curled part 4 of the end member 1 and a lower protrusion part 17 shaped to correspond to the panel part 2 and the inner wall 3. When the container body 7 and end member 1 placed above reach the top dead center, as shown in FIG. 1(a),
The curl portion 4 is arranged so as to be engaged with the annular group 16. Reference numeral 18 denotes a curling grate, which is made up of a pair of opposing halves in which the inner diameter of the semicircular inner recess 18a is slightly larger than the outer diameter of the container body 7. A curling group 19 is formed on the upper surface of the curling plate 18 in contact with the inner recess 18a. Each curling plate 18 is slidable in the radial direction of the container body (10) 7 through the base plate 20 and the guide route 22 by means of an air cylinder 21 fixedly mounted on the pace grate 20. The base plate 20 is configured to be movable up and down by a drive gear 11, a cam 23, a cam follower 24, and a vertical rod 25. Note that 26 is a frame, and 27 is a guide for guiding the vertical rod 25.

When the end member 1 (in this case, the bottom) is fixed to the open end of the container body 7 using the above device, the curled part 4 of the tip member 1 and the outer curved part of the container body 7 are fixed. After inserting the upper open end of the container body 7 into the annular molded portion 6 so that the two container bodies 8 face each other, the container body 7 is placed on the lifter plate 10 as shown in FIG. When placed, the lifter plate 10 and curling grate 18 are located at the bottom dead center. Next, the container body 7 rises as the drive gear 11 rotates, and the container body 7 reaches the top dead center, and as shown in FIG. 1(a), the inner wall 3 and curled portion 4 of the end member 1 respectively It is engaged with the side circumferential surface 17a of the lower protrusion 17 of the fixed chuck 15 and the annular group 16. In the initial state of engagement, the curling grate 18 is still located almost at the bottom dead center, and immediately after the engagement, the curling grate 18 is stopped moving radially inward by the air cylinder 21 (the state shown in FIG. 1(a)), and then A cam 23 is formed so as to rise, and the timing of the miniaturized cylinder 2 is adjusted.

On the other hand, the lifter cam 12 is formed so that the container body 7 is still located at the top dead center when the curling plate 18 reaches the top dead center. Therefore, while the curled portion 4 and the annular group 16 are engaged, the curling plate 18 rises, and the outer side 5 of the end member 1 is bent inwardly and upwardly into the curling group 19, and is bent inside the outer curved portion 8. 1(b), the end member 1 and the container body 7 are fixed in close contact with the outer surface of the container body portion 7a facing the inner side 3 of the end member 1, and the fixed part 9 is formed.

During the above operation, no axial load is applied to the container body 7. Next, the curling grate 18 is lowered and moved radially outward, and then the container body 7 to which the end member 1 is fixed is lowered to its original position.

The fixed portion 9 shown in FIG. 1(b) corresponds to a temporary seaming portion formed in the conventional double seaming method. Therefore, in order to achieve perfect sealing, as shown in FIG. It is desirable to form the double-sealed portion 32 by compressing it in the radial direction. At this time, almost no axial load is applied to the container body 7.

Note that 33 is a dihook.

In the above example, sealing 3719 is used to ensure sealing.
71 layers (not shown) were utilized. However, end member 1
The inner layer (not shown) of the annular molded part 6 and the outer layer (not shown) of the outer curved part 8 of the container body 7 are both made of heat-sealable plastic film, and the annular molded part 6 and the outer curved part 8 If at least one of them includes metal foil, as shown in FIGS. ) may be used to heat seal the inner layer and outer layer in the fixing step.

(13) In this case, no sealing gland layer is formed on the inner surface of the annular molded part 6. Naori-ring plate 18
Also, non-metallic materials (e.g. ceramics) are different from each other.
Desirable for its prevention of induction heating.

FIG. 4 shows a hanging part 8' which is connected to the outer curved part 4 of the container body 7', and whose lower end 8'a is connected to the lower end 5 of the outer wall 5 of the end member 1.
End member 1 when formed to substantially match a
This figure shows a method of fixing the container body 7'. The container body 7' having such a hanging part 8' can be produced by spinning,
Alternatively, if it is made of a material mainly consisting of thermoplastic glasstics, it can be formed using a curling device 40 as shown in FIG. In FIG. 5, reference numeral 41 is a Karl Noranger whose outer diameter is determined to be approximately equal to the inner diameter of the container body 7'.
A curling groove 42 having a shape corresponding to the outer curved portion 8 to be formed is formed on the structurally resistant upper surface of a. An annular groove 44 in the shape of an outer upper end 42a (14) of the curling groove 42 is formed in the lower curl ring 43 screwed onto the flange portion 41a. In addition, lower curl ring 4
The inner diameter of the container body 7' is approximately equal to the outer diameter of the container body 7'. 45 is an upper curl grating, 46 is an upper curl ring, and the upper curl grating 45 is a curl silanger 41.
Their structure is the same as that of the flange portion 41a and the lower curl ring 43, respectively, except that they are vertically slidable along the outer periphery of the flange portion 41a and the lower curl ring 43. That is, a curling groove 42' is formed in the upper curling grating 45, and a slit-shaped annular groove 44' is formed in the upper curling ring 46. Now, with the curl plate 45 and upper curl ring 46 pulled out from the curl plunger 41, the straight cylindrical container body is
After being inserted into the gap 47 between the curl plunger 41 and the lower curl ring 43, the flange portion 41a and the curl plate 45 are maintained at a temperature higher than the softening point and lower than the melting point of the thermoplastic that constitutes the container body. When the curl plate 45 and the upper curl ring 46 are inserted into the curl plunger 41 in the hanging state and lowered, the open end of the container body softens and curls along the curling grooves 42, 42', and further forms a slit. Annular grooves 44, 44! Inwardly, an outer bend 8 and a depending portion 8' are formed. The upper curl ring 46 and the lower curl ring 43
By unscrewing the screws, the container body 7' can be removed.

As shown in FIG.
In the same manner as in FIG. 1, the end member 1 is held down by the fixing chuck 15, and the curling plate 18 is lifted up so that approximately the lower half of the outer wall 5 and the hanging portion 8' is removed. It is bent inwardly and upwardly along the curling group 19 to bring it into close contact with the container body portion 7'a that is in contact with the inner wall 3, thereby forming the fixing portion 9' shown in FIG. 4(b).

Furthermore, as shown in FIG. 4(c), it is preferable to form the fixed part 9' into a double seaming part 32' by means of a rotary chuck 30 and a second seaming roll 31, in order to ensure complete sealing. .

In FIG. 6(a), the structure of the end member 1 is the same as that in FIG. The difference is that a substantially circular outer annular portion 50 is formed. In this case as well, the JJJ-shaped molded part 6 inner body body 7 is arranged so that the upper half of the outer annular part 50 and the curled part 4 are in contact with each other (via a sealing cone gland layer, not shown, if necessary). , and with the fixed chuck 15 holding the end member 1, the curling grate 18 is raised and the outer wall 5 is bent inward along the curling group 19, as shown in FIG.
As shown in b), a fixed portion 9 is formed in close contact with the lower half of the outer annular portion 50. Note that when heat sealing is performed, it is preferable that the curling grate 18 also incorporate a high frequency induction heating coil (not shown). The outer annular portion 50 is formed using a spinning method or a curling device 60 as shown in FIG. It is formed. The structure and working method of the curling device 60 are as follows, except that curling grooves 64° 64' having a semicircular cross section are formed in the lower curling ring 63 and the upper curling ring 66.
It is similar to the curling device 40 in FIG.

Note that the work of bending the outer wall 5 inward in the radial direction was performed in the eighth
Curling roller 70 and rotary chuck 7 as shown in the figure
1 may be used. That is, the rotating chuck 71
While simultaneously rotating the container body 7 and the end member 1 mounted on a lifter plate (not shown), the curling roller 70 is moved inward in the radial direction of the container body 7, and the curling groove 72 curls the outer wall. 5 is bent inward to bring it into close contact with the lower half of the outer annular portion 50.

According to the present invention, when fixing the end member to the container throat,
Since almost no axial load is applied to the container body, a container body with low rigidity can be used, which has the effect of widening the range of choices for the material of the container body. Furthermore, the formed fixed part has a tubular cross section, or can be further formed into a double seam part, which has the advantage of improving the strength of the container, especially the strength in the C18) radial direction. .

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view of the main part of the vessel showing the first method of the present invention, in which FIG. 1(a) shows the state before fixing, and FIG. 1(b) shows the state after fixing. Drawing showing the state, Figure 1 (c
) is a drawing showing a state in which the fixed portion of FIG. 1(b) is formed into a double seaming portion, FIG. 2 is a longitudinal sectional view of an example of the apparatus used to carry out the method of FIG. The figure is fI [-1
11 is a plan view taken from line 11, and FIG. b) is a drawing showing the state after fixing, and Fig. 4(C) shows the fixed part in Fig. 4(b).
FIG. 5 is a vertical sectional view of an example of the tool for forming the container body shown in FIG. 4, and FIG. 6 is a drawing showing the third method of the present invention. FIG. 6(,) is a vertical sectional view of the main part of the instep, and FIG.
b) is a drawing showing the state after fixing, FIG. 7 is a vertical cross-sectional view of an example of the tool for forming the container body shown in FIG. 6, and FIG. FIG. 6 is a vertical cross-sectional view of the main part of the pot showing an example of implementation using a tool different from that in FIG. 6; ■... End member, 2... Panel part, 3... Inner wall, 4
... Curled part, 5... Outer wall, 61 Annular molded part, 7,
7', 7〃... Container body, 8... Outer curved part,
8'... hanging part, 5°... outside 111! + annulus. Patent applicant Sho Kishimoto Figure 5 (a) (b) Figure 7 Figure 8

Claims (3)

[Claims] (1) In a method of fixing an end member to an open end of a container body made of a low-rigidity material, the end member includes an inner wall rising almost perpendicularly from the periphery of the panel portion, a curled portion connected to the upper end of the inner wall; An annular molded part made of an outer wall hanging down from the lower end of the curled part is formed, an outer curved part having a shape substantially corresponding to the curled part is formed at the open end, and the outer curved part and the curled part are in contact with each other. The end member is formed into a container body by inserting the open end into the annular molded part, bending the outer wall inwardly and upwardly, and bringing the end member into close contact with the container body portion that is in contact with the inner wall. How to stick to. (2) In a method of fixing an end member to an open end of a container body made of a low-rigidity material, the end member is provided with an inner wall rising almost perpendicularly from the panel circumference, and a curled portion connected to the upper end of the inner wall. , forming an annular molded part consisting of an outer wall hanging down from the lower end of the curled part, forming an outer curved part and a hanging part at the open end, each having a shape corresponding to the curled part and the outer wall, respectively; The open end is inserted into the annular molded part so that the outer curved part and the curled part, and the hanging part and the outer wall are in contact with each other, and the outer wall and substantially the lower half of the hanging part are simultaneously pushed inward and upward. A method for fixing an end member to a container body, the end member being bent and brought into close contact with the container body portion that abuts the inner wall. (3) In a method of fixing an end member to an open end of a container body made of a low-rigidity material, the end member includes an inner wall rising almost perpendicularly from the periphery of the panel portion, a curled portion connected to the upper end of the inner wall, An annular molded part is formed with an outer wall hanging down from the lower end of the curled part, and an outer annular part whose upper half has a shape substantially corresponding to the curled part and whose cross section is approximately circular is formed at the open end. , inserting the open end into the annular molded part so that the upper half of the outer annular part and the curled part are in contact with each other;
A method of fixing an end member to a container body, comprising bending the outer wall inward to bring it into close contact with the lower half of the outer annular portion.