JP2000142746A - Container inner lid and manufacture therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a lower inner lid from being supplied together with an upper inner lid when the upper inner lid is supplied to a container by weakening a degree of close fitness of the overlapped inner lids. SOLUTION: A side part 11b of an inner lid 11 is formed with ribs 11e (protrusions). When the inner lids 11 are overlapped from each other, ribs 11e are present between a side part outer surface of the upper inner lid 11 and a side part inner surface of the lower inner lid 11 to enable a surplus clearance to be formed between the lids. Thus, a degree of close fitness between the upper inner lid 11 and the lower inner lid 11 can be decreased, so that the lower inner lid 11 is prevented from being sucked against the upper inner lid 11 and only the upper inner lid 11 can be supplied to the container.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inner lid provided between a container and an outer lid and for sealing the inside of the container, and more particularly, to weakening the degree of adhesion between stacked inner lids to facilitate separation. To an inner lid of a container that can

[0002]

2. Description of the Related Art FIG. 5 is a perspective view showing an inner lid of a conventional container, FIG. 6 is a cross-sectional view showing a state where the inner lid is mounted on the container, and FIG. 7 is a state in which the inner lids shown in FIG. FIG. The inner lid 1 shown in FIG. 5 is formed of, for example, polyethylene terephthalate (hereinafter, referred to as PET).

There are various shapes of the inner lid 1 in accordance with the shape of the container. FIG. 5 shows a circular inner lid 1. Reference numeral 1a indicates the bottom of the inner lid 1, and has a side 1b formed continuously from the bottom 1a in the height direction (Z1 direction). The bottom portion 1a swells convexly in the Z2 direction and forms a substantially spherical surface. The end of the side portion 1b is bent outward by approximately 180 degrees to form a flange portion 1c. Further, projecting pieces 1d, 1d extending outwardly are formed in a part of the flange portion 1c so as to be axially symmetric with each other.

As shown in FIG. 6, the inner lid 1 is mounted on a container 2 in which contents 3 are stored. At this time, the flange 1c is fitted to the opening edge 2a of the container 2. This container 2 is formed of, for example, a can or a container made of a resin, and is used as the container 2 for storing a liquid material such as ink or paint, as well as a semi-flowing material such as syrup or jam as the contents 3.

[0005] When the contents 3 (liquid or semi-liquid) are contained in the container 2 and the inner lid 1 is attached, the lowermost portion 1A of the spherically expanded bottom 1a is first filled with the contents. Touch object 3. Then, as the inner lid 1 is pushed in the Z2 direction, the contact area between the contents 3 and the bottom 1a gradually expands in the circumferential direction in the side 1b direction. The generated air can be gradually pushed out of the inner lid 1. That is, by attaching the inner lid 1, the degree of sealing inside the container 2 can be increased.

After increasing the degree of sealing inside the container 2 as described above, the outer lid (not shown) for preventing leakage of the contents 3 is sealed, so that the contents 3 are sealed inside the container 2. Is done. When the container 2 is opened, an outer cover (not shown) is first removed, and then the inner cover 1 is opened. At this time, by pulling up the inner lid 1 while holding both or one of the protruding pieces 1d, 1d, the inner lid 1 can be easily opened even with highly adhesive contents (for example, syrup). It is possible to do.

[0007]

However, the inner lid of the conventional container has the following problems. FIG. 6 above
The operation of supplying the inner lid 1 to the container shown in (1) is usually performed in a series of automated operation steps. As shown in FIG. 7, the inner lids 1 are stocked in a state in which a plurality of inner lids 1 are stacked. For example, the inner lids 1 are supplied one by one from the uppermost stage to the lowermost stage. Is done.

The supply method is as follows. For example, the protrusions 1d, 1d of the inner lid 1 are vacuum-adsorbed by a vacuum device or the like, and the vacuum suction is released when the protrusions 1d are supplied to the container 2. The inner lid 1 is mounted on 2a.

However, as shown in FIG. 7, in the case where the inner lids 1 are stacked, the inner surface of the side 1b of the lower inner lid 1 is opposed to the outer surface of the side 1b of the inner lid 1 stacked on the upper side. Comes in direct contact. Accordingly, a gap margin is not easily formed during this time, and the internal pressure is likely to be low, so that the degree of adhesion between the lower inner lid 1 and the upper inner lid 1 is increased.

Therefore, as described above, when the upper inner lid 1 is sucked by the vacuum device, the inner lid 1 located below the upper inner lid 1 is also sucked by the vacuum device at the same time.
There is a disadvantage that two inner lids 1 are supplied to one container, and sometimes two or more inner lids 1 are overlapped.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems. By weakening the degree of adhesion between the upper and lower inner lids, it is possible to reliably remove only one inner lid from a highly stacked inner lid. An object of the present invention is to provide an inner lid of a container that can be supplied to the container. Another object of the present invention is to provide a method of manufacturing an inner lid of a container that can be stacked with the degree of adhesion between the upper inner lid and the lower inner lid weakened.

[0012]

According to the present invention, there is provided an inner lid of a container provided between a container and an outer lid covering the container to seal the inside of the container, wherein the inner lid is provided with a bottom portion. A side portion surrounding the bottom portion, and a convex portion projecting in an inner surface direction or an outer surface direction of the side portion. When the inner lids are stacked, the side outer surface of the upper inner lid and the lower inner lid The projection is interposed between the inner lid and a side inner surface, and a clearance is formed between the side portions of the inner lid.

The inner lid of the container according to the present invention is particularly effective when the inner lid itself is formed of a thin shape and is lightweight. That is, a clearance is formed between the side outer surface of the upper inner lid and the side inner surface of the lower inner lid, and the force by which the lower inner lid adheres to the upper inner lid is applied to the lower inner lid. , So that when the upper inner lid is lifted, it is possible to prevent the lower inner lid from being lifted together with the upper inner lid.

The effect of the present invention can be exerted by forming the projection on either the side inner surface or the side outer surface of the inner lid. However, the degree of sealing in the container after the inner lid is mounted on the container is increased. In consideration of this, it is more preferable that the convex portion is formed on the inner surface of the side portion.

[0015] In the above, it is preferable that the convex portion is formed of a rib extending from the bottom of the inner lid to the edge of the opening. By forming a continuous rib from the bottom of the inner lid to the opening edge in this way, a clearance margin can be reliably formed between the upper inner lid and the lower inner lid, and the lower inner lid can be formed. It is possible to make it easier for external air to enter between the upper and inner lids. Therefore, the difference between the internal pressure between the upper and lower inner lids and the external air pressure can be reduced, so that the degree of adhesion between the two can be weakened and the two can be easily separated.

The inner lid is formed integrally with a projection protruding outward from an opening edge and a plurality of projections, and the plurality of projections based on the projection are formed. It is preferable that the formation position of the portion is different for each inner lid.

If the formation positions of the projections are different, it is possible to reliably prevent the side inner surface of the lower inner lid and the outer outer surface of the upper inner lid from coming into close contact with each other when the inner lids are stacked. Can be smoothly provided to the container. In addition, since the projecting pieces can overlap each other in the height direction, the projecting pieces can be prevented from spreading radially.

[0018] The present invention also relates to a bottom portion, a side portion surrounding the bottom portion, an opening edge formed by an upper edge of the side portion, and a flange portion extending from the opening edge to the outside of the side portion. In the method of manufacturing an inner lid using a mold having a shape,
A plurality of rib forming portions are provided on the surface forming the side portion and the inner lid is formed by a plurality of types of molds having different rib forming positions, and when the inner lids formed by different types are stacked, The convex portion formed on the side portion of the inner lid, and the convex portion formed on the side portion of the lower inner lid, the position of the convex portion is different for each inner lid so as not to overlap, Is what you do.

This makes it possible to use a plurality of female dies having different combinations of rib (projection) formation positions and simultaneously form a plurality of inner lids having ribs at different positions in one molding step. Therefore, when the inner lids thus formed are stacked in order, it is possible to prevent the ribs of the upper and lower inner lids from being fitted to each other, and to reliably form a clearance margin.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing an embodiment of the inner lid of the container according to the present invention, and FIG. 2 is a sectional view showing a state where the inner lids shown in FIG. 1 are stacked. Inner lid 11 of container shown in FIG.
Has substantially the same configuration as the conventional inner lid 1, and is integrally formed of, for example, polyethylene terephthalate (hereinafter, referred to as PET).

The inner lid 11 is formed from a circular bottom 11a as shown in FIG.
A side portion 11b extending in the direction is formed. Side part 11b
Is formed with a flange portion 11c having a substantially U-shaped cross section in the Z2 direction. This flange 1
Protrusions 11d, 11d are formed in a part of 1c so as to be substantially parallel to the bottom 1a.

A plurality of ribs (convex portions) 11e extending in the Z direction are formed on the side portion 11b. The rib 11e shown in FIG. 1 projects from the inner surface of the inner lid 11 in an inward direction (toward the center of the inner lid 11) in a convex cross-sectional shape, and has a height t from the inner surface (see FIG. 2).

As shown in FIG. 2, when the inner lids 11 are stacked, the side (inner surface) 11b of the lower inner lid 11 and the side (outer surface) 11b of the upper inner lid 11 are stacked. Rib 1
1e is interposed. Therefore, the side portion (inner surface) 11b of the lower inner lid 11 and the side portion (outer surface) 11b of the upper inner lid 11 thereof
A gap margin t 'corresponding to the height t of the rib can be formed between the two. The clearance allowance t 'is formed uniformly between the upper inner lid 11 and the lower inner lid 11 throughout. Therefore, the upper inner lid 11
And the lower inner lid 11 are not in direct contact with each other, and the degree of adhesion between the two can be reduced.

That is, the inner lid 1 formed on the side portion 11b
When the upper inner lid 11 is sucked by a vacuum device in the same state as the above in a state where one is stacked, only the upper inner lid 11 can be sucked. Therefore, the inner lid 11
Can be supplied to the container one by one.

A method of manufacturing the inner lid 11 will be described. 3 (A) to 3 (E) are conceptual diagrams showing a manufacturing process of the inner lid of the container. In the step of FIG. 3A, a sheet 30 in which PET is extended in a thin plate shape is intermittently conveyed by a conveying means (not shown), and a heater 3 provided in the middle of the conveyance is provided.
1 heats the sheet 30 until it reaches a suitable forming temperature.

In the step shown in FIG. 3B, the heated sheet 30 is transported between a female mold (female mold) 32 and a male mold 33 provided opposite to the female mold 32. . On the inner wall of the female mold 32, a plurality of convex ridges (rib forming portions) extending in the height direction are formed, and the ribs 11e can be formed.

As shown in FIG. 3B, both the female mold 32 and the male mold 33 can move up and down, and can approach or separate from each other. The male mold 33 is provided with a duct 33a, through which air can be sent.

In the step shown in FIG. 3C, the female mold 32 and the male mold 33 move in a direction approaching each other, and the sheet 30 is sandwiched between the female mold 32 and the male mold 33. Then, the compressed air is sent from the male mold 33 side to press the sheet 30 against the female mold 32 (pneumatic molding). The shape of the inner lid 11 is formed on the sheet 30 by such pressure forming.

Note that, as shown in FIG.
A large number of small holes 32a are formed in the bottom of the small hole 32a, and an exhaust duct 32b is provided on the lower surface of the small hole 32a.
The seat 30 and the female mold 3 are evacuated through
The inner lid 11 may be formed in a protruding state by vacuuming the space between them (vacuum forming). Alternatively, the molding may be performed by simultaneously performing the above-described pressure forming and vacuum forming.

FIGS. 3D and 3E show a die cutting step. After the step of FIG. 3 (C), the female mold 32 and the male mold 33 are moved in a direction away from each other. Then, the sheet 30 having the shape of the inner lid 11 is transported between the die 34 and the die 35 as shown in FIG. A female blade 34a is provided at the tip of the die 34, and a male blade 35a is provided at the tip of the die 35. The female die 34a and the male blade 3a are brought closer by bringing the die 34 and the die 35 closer to each other.
5a and the inner lid 11 of the container is cut from the sheet 30 (FIG. 3E).

Through the above-described manufacturing process,
The inner lid 11 of the container as shown in FIG.
Are transported by transporting means (not shown) and stacked in the order in which they were formed.

However, the ribs 11e are formed at the same positions on the inner lid 11 manufactured in this step. That is, the formation position of the rib 11e is
1 and the lower inner lid 11 completely coincide with each other, so if they are stacked as they are, the lower rib 11e fits with the upper rib 11e, and a clearance margin t 'cannot be formed. Therefore, the effect of weakening the degree of adhesion between the upper inner lid 11 and the lower inner lid 11 as described above cannot be effectively exhibited.

In order to prevent this, for example, before sequentially stacking the inner lids 11 formed in the above manufacturing process,
By rotating the inner lid 11, it is necessary to take measures such as shifting the forming position of the ribs 11e and stacking.

However, merely by rotating the inner lid 11 and stacking it, the protruding pieces 11d, 11d provided on the inner lid 11 are provided.
Since the d does not overlap with each other in the vertical direction, the protrusion 11
d and 11d spread radially, which is inconvenient in terms of storage and transport.

Therefore, the ribs 11e are manufactured so that the formation positions of the upper inner lid 11 and the lower inner lid 11 are different. For example, in the inner lid 11 shown in FIG. 1, a pair of ribs 11e, 11e are formed on a straight line mm connecting the projecting pieces 11d, and a straight line nn perpendicular to the straight line mm.
A pair of ribs 11e, 11e are formed thereon. That is, the ribs are at an angular interval α of 90 ° with each other (α = 90
°). Therefore, when the inner lid 11 is set to the lower side, each rib 11e of the upper inner lid 11 stacked on the lower inner lid 11 is located at a position different from the position of each rib 11e of the lower inner lid 11. The formation position can be set arbitrarily. For example, the straight line mm and the straight line nn connecting the ribs 11e are shifted by a predetermined angle β, and the straight line m'-m 'and the straight line n'-n' are shifted.
Rib 11e may be formed on the upper side, or the angular interval α of each lower rib 11e may be changed to the upper angular interval (α = 9).
0 °) (eg, α = 100 °).

FIG. 4 is a conceptual diagram showing an embodiment of a method for manufacturing an inner lid having ribs at different positions. Reference numerals A, B, C and D shown in FIG. 4 indicate a manufacturing apparatus (not shown) in which four types of female dies 32A, 32B, 32C and 32D having different rib forming positions are arranged in a matrix.
, Each inner lid formed on the molded sheet 30 is shown. Each of the female molds 32A, 32B, 32C and 32D
Are ridges (rib-formed portions) having different angular intervals α.
(Not shown), and each rib 11e can be formed at a different position.

The above-mentioned manufacturing apparatus comprises a set of four types of female dies 32A, 32B, 32C and 32D arranged in the lateral direction W, and the female dies 32A, 32B, 3 in this set.
The first set W1, the second set W2, the third set W3 and the fourth set W in which the combinations of the arrangements of 2C and 32D are different for each set.
4 are provided. That is, in this manufacturing apparatus, it is possible to form a total of 16 inner lids in four sets and four rows.

The first set W1 includes the first row L1 to the fourth row L
The female dies are arranged in the order of four female dies 32A, 32B, 32C and 32D. The inner lids formed by the first set W1 are inner lids A1, B1, C1 and D1 shown in FIG. It is. Similarly, the second set W2 is a female mold 32B, 32B.
C, 32D, and 32A are arranged in this order, and the inner lid formed by the second set W2 includes B2, C2, D2, and A
2. Similarly, the third set W3 includes female dies 32C and 32C.
D, 32A and 32B are arranged in this order, and the inner lid formed by this third set W3 is C3, D3, A3 and B
3. Similarly, the fourth set W4 includes female dies 32D and 32D.
A, 32B and 32C are arranged in this order, and the inner lid formed by this fourth set W4 is D4, A4, B4 and C
4.

An inner lid A (A) formed of the female mold 32A
1, A2, A3 and A4) are all of the same shape,
The rib 11e is formed at the same position. This also means
The same applies to the inner lids B, C and D formed by the other three types of female molds 32B, 32C and 32D. Note that, at positions facing the female dies 32A, 32B, 32C, and 32D, male dies similar to those shown in FIG. 3 are provided.

The molded sheet 30 is conveyed between the sixteen female dies arranged in the four sets and four rows and the male dies corresponding thereto, respectively, as shown in FIGS. 3A to 3E. Through the manufacturing process shown, 16 inner lids A1 to D4 are simultaneously formed on the formed sheet 30 as shown in FIG.

The sixteen inner lids A1 to D4 formed in the above steps are stacked in the following order. The inner lid A1 of the first set W1 and the first row L1 is set at the lowermost stage, and the inner lids B1 of the first set W1 and the second row L2 are stacked thereon. Hereinafter, similarly, the inner lid C1 and the inner lid C1 are placed on the inner lid B1.
On the inner lid D1 in this order. When the stacking of the first set W1 is completed, the inner lids B2, C2,
D2 and A2 are stacked.

The stacking of the second set W2 is based on the first set W1.
On the inner lid D1 at the top (fourth tier)
In the set W2, the inner lids A2 in the fourth row L4 are stacked, and the inner lids D2, C2, and B2 and the fourth row L4 to the first row L1 are stacked thereon.
Stack in the order toward. Similarly, the third set W3 is stacked at the uppermost stage (eighth stage) stacked in the second set W2.
Of the third set W3 and the first row L1 are stacked on the inner lid B2, and the inner lid D3, the inner lid A3, the inner lid B3 and the first lid are placed thereon.
The sheets are stacked in the order from the row L1 to the fourth row L4. Similarly, the fourth set W4 is stacked by stacking the inner set C4 of the fourth set W4 and the fourth row L4 on the innermost set (the twelfth step) of the inner set B3 stacked in the third set W3. And the inner lid B4, the inner lid A4, the inner lid D4 and the fourth row L4 toward the first row L1.

Of the sixteen inner lids A1 to D4 thus stacked, the lowermost (first level) is the inner lid A1, and the uppermost level (16th level) is the inner lid D4. By stacking in this manner, the inner lids having the ribs 11e at the same position between the lower side and the upper side are not stacked.

Thus, between the inner surface of the lower inner lid and the outer surface of the upper inner lid, which are stacked high, a clearance margin t 'can be formed by each rib 11e. That is, it is possible to weaken the degree of adhesion between the stacked lower inner lid and the upper inner lid.

Therefore, it is not necessary to check the rib forming position of the inner lid after molding, and to stack while changing the direction of the inner lid.
The protrusion 11d does not spread radially. Further, since it is only necessary to stack the inner lids after molding in order, the work of stacking the inner lids can be performed quickly.

In the above description, the rib 11e projecting in the direction of the inner surface of the inner lid 11 has been described. However, the present invention is not limited to this, and the rib 11e projects outward from the side outer surface of the inner lid 11. May be used.

The present invention is not limited to the rib 11e extending continuously from the bottom of the inner lid to the edge of the opening.
For example, the protrusion may be formed in a dot-dot shape in the direction of the side inner surface or the side outer surface of the inner lid 11.

Further, in the above description, the manufacturing apparatus for simultaneously forming 16 inner lids using four types of female molds having different ribs (convex portions) has been described. The number of inner lids to be used is not limited to this.

Although the shape of the inner lid is circular,
The inner lid of the container in the present invention is not limited to this. That is, any shape may be used as long as it conforms to the shape of the container. For example, the inner lid may have a square shape or a rectangular shape.

[0050]

According to the present invention described in detail above, the degree of adhesion between the stacked inner lids can be reduced, so that when the upper inner lid is supplied to the container, the lower inner lid is put together. It can be prevented from being supplied. That is, one container has one
The inner lids can be reliably supplied. In addition, it is possible to prevent the projecting pieces of the inner lid from being spread after molding, and it is possible to quickly perform the work of stacking the inner lid.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of an inner lid of a container according to the present invention,

FIG. 2 is a sectional view showing a state in which the inner lids shown in FIG. 1 are stacked;

3 (A) to 3 (E) are conceptual diagrams showing a manufacturing process of an inner lid of a container,

FIG. 4 is a conceptual diagram showing a method for manufacturing an inner lid having ribs at different positions,

FIG. 5 is a perspective view showing an inner lid of a conventional container,

FIG. 6 is a cross-sectional view showing a state where the inner lid is attached to the container;

FIG. 7 is a sectional view showing a state in which the inner lids shown in FIG. 5 are stacked;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Inner lid 11a Bottom part 11b Side part 11c Flange 11d Protrusion piece 11e Rib (convex part) 30 Molded sheet 32 Female type A, B, C, D Inner lid t Rib height dimension t 'Clearance margin

 ──────────────────────────────────────────────────の Continued on the front page F term (reference) 3E006 AA01 BA08 CA01 DA04 FA03 3E084 AA02 AA12 AA22 AA24 AB01 AB06 BA01 CA01 CC03 DA01 DB09 DC03 EA03 EB10 EC03 FA09 GA08 GB12 GB17

Claims (4)

[Claims] 1. An inner lid of a container, provided between a container and an outer lid covering the container, for sealing the inside of the container,
The inner lid has a bottom portion, a side portion surrounding the bottom portion, and a convex portion projecting in an inner surface direction or an outer surface direction of the side portion, and a side outer surface of an upper inner lid when the inner lid is stacked. The inner lid of a container, wherein the convex portion is interposed between the inner lid and a side inner surface of the lower inner lid, and a clearance is formed between the side parts of the inner lid. 2. The inner lid of a container according to claim 1, wherein said convex portion comprises a rib extending from a bottom of the inner lid to an opening edge. 3. A projection protruding outward from an opening edge and a plurality of projections are integrally formed on the inner lid, and the plurality of projections are defined with respect to the projection. The inner lid of a container according to claim 1 or 2, wherein a position where the portion is formed is different for each inner lid. 4. A shape corresponding to a bottom, a side surrounding the bottom, an opening edge formed by an upper edge of the side, and a flange extending outward from the side from the opening edge. In a method of manufacturing an inner lid using a mold, a plurality of rib forming portions are provided on a surface forming the side portion, and the inner lid is formed by a plurality of types of molds having different rib forming positions, and a different type is used. When the molded inner lids are stacked, the positions of the convexities so that the convexities formed on the sides of the upper inner lid and the convexities formed on the sides of the lower inner lid do not overlap. The method for manufacturing an inner lid of a container, wherein the method is different for each inner lid.