JPH05213346A - Cover body for container and manufacture thereof - Google Patents

Abstract

PURPOSE: To maintain the insert position till a closure unit is firmly fixed on a container completely. CONSTITUTION: This closure unit is molded with thermoplastic materials by a multi-material injection molding method, in which molding by a first material is carried out, then molding by a second material is carried out when the residual heat in the first material region in molding and cooling by the first material is conducted to the molding position of the second material. The part corresponding to the thick wall part formed in the region of the first material is deformed by the molding mold by the utilization of the heat conducted to the molding position of the second material. The lid part 11 consists of a tubular pouring part 16 and a lid part 15 for opening and closing a pouring mouth of the pouring part 16, and for the pouring part 16 a holding means to tentatively hold the closure unit 11 in the opening 12 of the container 10 is provided. The holding means has a pair constitution, and can be formed with a linking pawl 29 formed against the container wall or a mold linking element provided outside the pouring part 16.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lid of a container and a method for manufacturing the lid.

[0002]

2. Description of the Related Art Conventionally, in a container formed of, for example, a metal can or a cardboard whose inside is coated with a fluid such as a liquid, a lid is provided so that the spout can be repeatedly opened and closed. The lid includes a spout portion having a spout and a lid portion that opens and closes the spout. The lid is used by being fitted into an opening formed in the container, and a thermoplastic material is used as the material (Swiss patent application No. 2739 / 91-2).
No. and Swiss Patent Application No. 2740 / 91-9 (filed Sep. 17, 1991).

The lid body is formed by a multi-material injection molding method using two or more materials having at least one characteristic different from each other. The Swiss patent application No. 2740 / 91-
In the lid described in No. 9, the lid is not completely separated from the spout even when the spout is opened in order to facilitate handling when the lid is normally used. It is like this. Therefore, one or two or more webs are formed in the lid part, and the web is made flexible to connect the lid part and the spout part, or
The lid and the container are connected.

[0004]

However, in the conventional lid of the container, since the spout or the part between the container and the lid is connected by the web, the position of the lid when the spout is opened is changed. I can't stabilize. Therefore, before the operation of closing the spout with the lid portion, the operation of aligning the position of the lid portion with the spout portion is necessary. As a result, the swing of the lid portion deforms the web, and this deformation causes the web to be rapidly fatigued and damaged. Therefore, in order to prevent the fatigue and breakage of the web, it is conceivable to form the web with a highly flexible material or to thin the web.

However, the web needs to be formed of the same material as that of the lid portion, particularly, the outside of the lid portion, and it is not preferable to limit the material to increase flexibility.
Further, if the web is made too thin, it tends to be damaged when a tensile force is applied, resulting in a decrease in durability. Further, the conventional lid body made of one material also has a web connecting the spout portion and the lid portion. The lid is manufactured with the spout open, and the spout is closed before or after being attached to the container. Therefore, the number of manufacturing steps increases accordingly.

Furthermore, not only can the lid cannot be attached to the container having the shape when completed, but it cannot be attached to any position where it can be easily attached. When the lid is attached to the container, it is necessary to insert the lid into the opening formed in the container and then hold it at the insertion position until it is fixed. Therefore, a jig is required so that the lid does not fall off during the period from the insertion to the fixing.

The present invention solves the above-mentioned problems of the lid of the conventional container, can be formed as a unit, can be automatically incorporated in the manufacturing process, and can be inserted into the opening of the container. After that, it is an object of the present invention to provide a lid of a container and a manufacturing method thereof, which can be held in the insertion position until it is completely fixed.

[0008]

Therefore, in the method of manufacturing the lid of the container of the present invention, a thermoplastic material is molded by the multi-material injection molding method. Then, molding with the first material is performed, followed by molding with the second material, and the heat remaining in the region of the first material during the molding with the first material and the cooling with the second material is removed. Inform the molding position of the material.

In this case, a thick portion is formed in the region of the first material, and the thick portion is opposed to each other provided on the molding die by utilizing the heat transmitted to the molding position of the second material. Transformed by the element. Further, in the lid of the container of the present invention, a substantially cylindrical spout portion, and a lid portion that opens and closes the spout of the spout portion, the spout portion, in the opening of the container Holding means for temporarily holding the lid is provided.

The holding means have a paired structure and can be formed by engaging claws formed facing the container wall or by mold engaging elements provided outside the spout portion. In this case, the mold engagement element forms an engagement connection with the container.
And, the mold engaging element can be a thick portion. Further, in the case where the spout portion has a polygonal cross section, the holding means can be formed corresponding to the opposite edges of the spout portion.

[0011]

According to the present invention, as described above, the thermoplastic material is molded by the multi-material injection molding method. Then, molding is performed using the first material, and subsequently,
Molding with the second material is performed. Heat remains in the region of the first material during molding and cooling with the first material,
The heat is transferred to the molding location of the second material.

In this case, a thick portion is formed in the region of the first material, the heat remaining in the thick portion is transferred to the thick portion of the second material at the molding position, and the heat is utilized. The thick portion is deformed by the opposing element provided on the mold. Further, in the lid of the container of the present invention, a substantially cylindrical spout portion, and a lid portion that opens and closes the spout of the spout portion, the spout portion, in the opening of the container Holding means for temporarily holding the lid is provided.

When mounting the lid on the container, first, the lid is inserted from the inside of the opening of the container, and the lid is temporarily held on the container by the holding means. Then, the base of the lid is fixed to the container wall. The holding means has a pair of structures, and can be formed by engaging claws formed so as to face the container wall, or by mold engaging elements provided outside the spout portion. In this case, the mold engagement element is formed by injection molding to form an engagement connection with the container. And, the mold engaging element can be a thick portion.

Further, in the case where the spout portion has a polygonal cross section, the holding means can be formed corresponding to the opposite edges of the spout portion.

[0015]

Embodiments of the present invention will now be described in detail with reference to the drawings. 1 is a perspective view of a container before the lid of the present invention is attached, FIG. 2 is a perspective view of a container with the lid of the present invention in a closed state, and FIG. 3 is a lid of the present invention with an opened state. It is a perspective view of the container which did.

In the figure, reference numeral 10 is a container formed of cardboard with the inside coated with fluid, and 11 is a lid made of a thermoplastic material. When the container 10 is manufactured, the lid 11 is manufactured at an early stage of the manufacturing process, and at that stage, the container 10 is not completed as shown in FIG. Next, the lid 11 is attached to the opening 12 of the container 10. The lid 11 can be placed in a closed state as shown in FIG. 2 or in an open state as shown in FIG.

FIG. 4 is an explanatory view of the lid of the container showing the embodiment of the present invention, and FIG. 5 is a vertical sectional view of the lid of the container showing the embodiment of the present invention. In the figure, 10 is a container, 11 is a lid, 1
2 is an opening of the container 10. The cross section of the lid 11 may have any shape. For example, it can be circular, elliptical, polygonal, or a combination thereof. In this embodiment, a polygon, particularly a pentagon, is used. Reference numeral 15 is a lid portion that closes the spout of the spout portion 16. The spout portion 16 is a spout portion having a cylindrical shape, an elliptic cylindrical shape, or a polygonal cylindrical shape, that is, a substantially cylindrical shape, and in the present embodiment, has a pentagonal cylindrical shape. The spout portion 16
Together with the lid portion 15 form a lid 11. 1
Reference numeral 7 is a locking claw for locking the lid portion 15 to the spout portion 16.

Further, the container 10 for mounting the lid 11
An opening 12 is formed in the lid 12, and the lid 11 is mounted from the inside of the opening 12. In this case, the lid 11 has the opening 12
You cannot force it into, and the rim keeps its original condition.
Therefore, the opening 12 is made larger than the outer edge of the lid 11 for mounting the lid 11, and a gap 8 a is formed between the container 10 and the lid 11.

The projection shown in FIG. 4 shows that the opening 12 of the container 10 is large enough to pass the outer peripheral edge of the lid body 11. In this case,
The opening 12 has the smallest size. However, the lid 11
After being inserted into the opening 12, there is a possibility that it may slip off or be placed at an angle at the opening 12. Therefore,
An auxiliary element such as a retaining ring could be used to retain the lid portion 11, but this would complicate the manufacturing process.
In the method for manufacturing the lid of the container according to the present invention, the engaging claw or the mold engaging element for temporarily holding the lid portion 11 can be formed in the same injection molding process.

FIG. 6 is a sectional view taken along line XX of FIG. In the figure, 11 is a lid, 15 is a lid part, and 16 is a spout 15a.
A spout portion, 18 is a base, 19 is the lid 1
1 is a container wall having an opening 12 for mounting 1. Reference numeral 20 denotes a container wall which is translated from the container wall 19 along imaginary lines 21 and 22 extending perpendicularly to the opening 12.

In the figure, the container wall 19 shows, for example, a state in which the lid 11 is inserted and mounted in the opening 12, and the container wall 20 shows, for example, the lid 11 in the direction of arrow D with respect to the opening 12. It shows the state when moving to. The opening 12 is slightly larger than the lid portion 15 and a knob or handle 23 projects from the spout portion 16 to form a surface 24. The surface 24 is a part of the reference surface 26 of the lid portion 15 shown by a broken line 25. The reference surface 26 is inclined with respect to the container wall 19. Similarly, the wall 27 of the spout portion 16 is also angled inward and is not perpendicular to the container wall 19.

The outlet portion 16 is preferably arranged laterally like a pyramid, in which case the outlet portion 16 is tapered towards the outlet when viewed from the bottom. By doing so, the handle 23 and the lid portion 15 can be projected from the spout portion 16, and in that state, the lid portion 15 can be mounted from the inside of the container 10 through the opening 12. In this case, the area of the reference surface 26 may simply be smaller than that of the opening 12.

FIG. 7 is a cross-sectional view of the lid of the container showing the embodiment of the present invention, and FIG. 8 is a perspective view of the lid of the container showing the embodiment of the present invention. 7A is a sectional view of the spout portion 16,
7B is a cross-sectional view taken along line DD of FIG. 7A. As shown in FIG. 7 (b), the lid 11 is provided with means for facilitating positioning and vibration conveyance, and a large amount is collectively conveyed to the processing position. The means can be formed at an appropriate position from the end of the lid 11 to the fixed portion of the fixed region S (the portion indicated by the chain double-dashed line). Further, the lid 11 may be circular, elliptical, polygonal, or a combination thereof, but in any case, as shown by the pentagonal shape in the drawing, the lid 11 is provided with a temporary structure. Holding means are provided.

H indicates a place where the engaging claws 29 are normally provided so as to form a pair and face each other. These engaging claws 29 are formed in the shape of a prism, for example, as shown in FIG. The engagement claw 29 fixes the fixing area S to the container 10. Two engaging claws 29 are sufficient to hold the insertion position of the lid 11 until the lid 11 is completely fixed to the container 10 after the lid 11 is inserted into the opening 12.

Next, another embodiment of the holding means will be described. FIG. 9 is a vertical cross-sectional view of the lid of the container showing the second embodiment of the present invention. First, the lid 1 having the lid portion 15
1 is inserted from below the container wall 19. Then, when the position shown in the figure is reached, the mold engaging element, that is, the thick portion 31 in the engaging portion 30, is locked to the end surface of the container wall 19, and, for example, like the cam, the container wall 19 and the spout 16
Prohibit movement in only one direction.

Such a fixing method is suitable for temporarily holding the spout portion 16 before it is fixed to the container wall 19 by, for example, ultrasonic welding. Although the engaging portion 30 is shown only at one place in FIG. 9, such engaging portion 30 can be provided at a plurality of places around the spout portion 16 as shown by H in FIG. 7. Next, a specific molding process for molding the thick portion 31 without using an auxiliary slide in the high-speed injection molding process will be described.

FIG. 10 is a schematic view of an injection molding process using two materials. As shown in the figure, the first material A is on the right side.
And an injection molding block with an injection molding machine for the second material B is provided, on the left is a mold on a four-position rotation station. First material A at position 1
Is injected, the molded product is cooled at position 2, the second material B is injected at position 3, and the molded product is taken out at position 4. These operations occur at high speed after all positions 1-4 have been activated.

FIG. 11 is a view showing the mold in the mold open state at the position of the rotating station immediately before the material of the lid portion is injected. In the figure, the mold members 33, 34 for molding with the first material A and the molded thick portion 31 are shown. In this case, if the locking claw 17 is simply injection-molded, the molding die member 34 is moved in the arrow E direction after molding. Further, for example, when molding the engaging portion 30, it is necessary to have two molding die members 33 and 34.

After molding, first, a molding die member 33 called a slide is moved from the spout portion 16 in the direction of arrow F, and subsequently moved together with the molding die member 34 in the direction of arrow E. However, if it is desired to move the mold member 33 only in the direction of the arrow F, the mold member 33 is placed on the turntable 36. The molding die member 33 includes a thick portion 31 as well as a die portion for molding the locking claw 17.
It also includes a facing element 30a paired with.

In order to mold the thickened portion 31 at position 3 (FIG. 10) on the rotating station, the part molded at position 1 has a portion corresponding to the thickened portion 31. The material has residual heat after passing through position 2 for cooling. Then, when the molding process using the second material B is performed at the position 3, the portion corresponding to the thick portion 31 is plastically deformed. By doing so, in the molding process of the second material B, a part of the first material A, which has been mostly solidified by cooling, is deformed. This step allows the thickened portion 31 to be molded at position 3 without the use of an auxiliary slide at position 1. However, a slide is required to form the locking claw 17. The use of slides lowers the molding speed and lengthens the molding time, but the molding die itself is inexpensive.

The shape of the facing element 30a is changed depending on the mounting condition of the lid 11 and the condition of the container 10, and can have any shape. The engagement part 30 shown here is an example of them. Also, the engaging portion 30
Alternatively, a holding member formed to cover the entire spout portion 16 may be provided. Also in this case, the residual heat from the first molding is sufficiently transferred to the first material A, and the portion corresponding to the thick portion 31 can be deformed during the second molding with the second material B. is there.

In the step of molding the thermoplastic material by the multi-material injection molding method, molding with the first material A is performed,
The heat remaining in the region of the first material A by the molding and cooling is transferred to the molding position of the second material B. A selected portion of the region of the first material A, for example, the thick portion 31 is transferred with residual heat during the molding of the second material B and is deformed by the facing element 30a.

The present invention is not limited to the above-mentioned embodiments, but can be variously modified within the scope of the present invention, and they are not excluded from the scope of the present invention.

[0034]

As described in detail above, according to the present invention, when the lid of the container is manufactured, the molding is performed using the first material, and then the molding is performed using the second material. The heat remaining in the region of the first material during the molding and cooling of the first material is transferred to the molding position of the second material.

In this case, a thick portion is formed in the region of the first material, the heat remaining in the thick portion is transmitted to the thick portion of the second material at the molding position, and the heat is utilized. The thick portion is deformed by the opposing element provided on the mold. Further, in the lid of the container of the present invention, a substantially cylindrical spout portion, and a lid portion that opens and closes the spout of the spout portion, the spout portion, in the opening of the container Holding means for temporarily holding the lid is provided.

When the lid is attached to the container, first, the lid is inserted from the inside of the opening of the container, and the holding means temporarily holds the lid with respect to the container. Then, the base of the lid is fixed to the container wall. The holding means has a pair of structures, and can be formed by engaging claws formed so as to face the container wall, or by mold engaging elements provided outside the spout portion. In this case, the mold engagement element is formed by injection molding to form an engagement connection with the container. And, the mold engaging element can be a thick portion. In the case where the spout portion has a polygonal cross section, the holding means can be formed corresponding to the opposite edges of the spout portion.

Therefore, it can be formed as a unit, can be automatically incorporated into the manufacturing process, and after being inserted into the opening of the container, held in the insertion position into the opening of the container until completely fixed. can do.

[Brief description of drawings]

FIG. 1 is a perspective view of a container before mounting a lid of the present invention.

FIG. 2 is a perspective view of a container equipped with a closed lid of the present invention.

FIG. 3 is a perspective view of a container equipped with an open lid of the present invention.

FIG. 4 is an explanatory view of the lid of the container showing the embodiment of the present invention.

FIG. 5 is a vertical sectional view of a lid of a container showing an embodiment of the present invention.

6 is a cross-sectional view taken along line XX of FIG.

FIG. 7 is a cross-sectional view of the lid of the container showing the embodiment of the present invention.

FIG. 8 is a perspective view of the lid of the container showing the embodiment of the present invention.

FIG. 9 is a vertical sectional view of a lid of a container showing a second embodiment of the present invention.

FIG. 10 is a schematic view of an injection molding process using two materials.

FIG. 11 is a view showing the mold in the mold open state at the position of the rotation station immediately before injecting the material of the lid portion.

[Explanation of symbols]

 10 Container 11 Lid 12 Opening 15 Lid 15a Spout 16 Spout 19 and 20 Container Wall 29 Engagement Claw 30 Engagement 31 Thick Part

Claims (8)

[Claims] 1. A method of manufacturing a lid of a container molded from a thermoplastic material by a multi-material injection molding method, comprising: (a) molding with a first material; and (b) subsequently molding with a second material. And (c) transferring the heat remaining in the region of the first material during molding with the first material and during cooling to the molding position of the second material. Method. 2. A thick portion is formed in a region of the first material, and the thick portion is formed in a mold by using heat transferred to a molding position of the second material. The method for manufacturing a lid for a container according to claim 1, wherein the container is deformed by an opposing element provided on the. 3. A container lid used for a container for containing a fluid and formed of a thermoplastic material,
(A) a substantially cylindrical spout, (b) a lid for opening and closing the spout of the spout, and (c) a lid at the opening of the container at the spout. A lid of a container provided with a holding means for temporarily holding. 4. The container lid according to claim 3, wherein the holding means have a paired structure. 5. The container lid according to claim 3, wherein the holding means is an engaging claw formed so as to face the container wall. 6. The mold engagement element according to claim 3 or 4, wherein the holding means is a mold engagement element provided outside the spout portion, the mold engagement element forming an engagement connection with a container. Lid of the container. 7. The lid of a container according to claim 6, wherein the mold engagement element is a thick portion. 8. The method according to claim 5, wherein (a) the spout portion has a polygonal cross section, and (b) the holding means is formed so as to correspond to opposite edges of the spout portion. The lid of the container.