JP3087249B2 - Molded product with label, molding apparatus and molding method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a synthetic resin molded product in which a label is embedded in the outer peripheral surface of a cylindrical wall, a molding apparatus for the molded product,
And it relates to a molding method.

[0002]

2. Description of the Related Art As means for displaying characters and patterns on the outer peripheral surface of a cylindrical wall of a synthetic resin molded product, there is known a method of injection molding a molded product using a label on which the characters and patterns are printed in advance as an insert material. ing.

A conventional technique for injection molding a molded product using this label as an insert material is disclosed in Japanese Patent Publication No. 45-3 / 1973.
No. 0223 and Japanese Patent Publication No. 53-45344.

In the prior art disclosed in Japanese Patent Publication No. 45-30223, a label previously inserted into a mold space as an insert material is correctly pressed against the cavity mold surface by the injection pressure of a synthetic resin material to be injected. And the label is correctly positioned on the outer peripheral surface of the cylindrical wall of the molded product.

In the prior art disclosed in Japanese Patent Publication No. 53-45344, a label inserted in a mold space can be used without improperly changing the position of the label. In addition, the molding material can be injected into the mold space.

[0006]

The prior art described above is
Although it has the excellent effect that the molding material can be injected without improperly displacing the label inserted in a state where it is positioned in the molding die space, it has an excellent effect as an insert material. Labels are generally made of film and have a low self-shape retention ability, which makes it extremely difficult to assemble them in a precisely positioned state in the mold space. Or the provision of a dedicated holding means unnecessarily complicates the structure of the mold apparatus.

Further, even if the label is assembled in a state where the label is accurately positioned in the mold space by appropriate means, as described above, the label itself has very low self-shape holding ability in most cases. Therefore, there is a problem that the label is liable to be incorrectly displaced due to the vibration of the mold clamping operation of the mold apparatus, and the yield is extremely deteriorated.

Further, when positioning of the label in the mold space is achieved by abutting the end face of the label against the mold face, the end face of the label as the insert material is exposed. Therefore, if paper is used as the material of the label, or if there is an aluminum vapor-deposited layer, the label or the vapor-deposited layer deteriorates due to the exposure of the end face of the label, and the display on the label becomes dirty at an early stage. However, there is a problem in that the decorative property of the label is lost.

In view of the above, the present invention has been made in order to solve the above-mentioned problems in the prior art. The technical task is to achieve this by using the movement and to completely cover the end face of the label, which is the insert material, with the molding material of the molded product, so that the label can be easily and accurately assembled in the mold space. It is an object of the present invention to achieve the display function and the decoration function by the label for a long period of time and safely.

[0010]

Means for Solving the Problems According to the means of the present invention for solving the above technical problem, a lower end portion is a leg tube piece, and a label is embedded on the outer peripheral surface without exposing the lower end surface of the label. An outer flange-shaped flange is provided on the lower surface of the flange, and an outer flange piece having an upper end portion of the label bent outward is provided on an outer periphery of the outer flange piece. Embedding without exposing the end face.

As a whole structure of the molded product, a gate port is positioned at the center of the lower surface, and a bottom wall in which a portion connected to the peripheral wall of the cylindrical wall is opposed to the upper end of the leg tube piece of the cylindrical wall. It is advantageous to have a structure having.

In the above-mentioned molding apparatus, a cylindrical molding space in which an outer flange-shaped flange space having a lateral width larger than a thickness width is continuous at an upper end by clamping with a core. Into the cavity to be formed, a top mold that forms the molding die surface of the leg piece space, which is the lower end of the molding die space, is assembled so as to be displaceable along the mold moving direction. In the mold clamping position, the height of the mold space is set to a value equal to the height of the label as the insert material.

[0013] In this molding apparatus, for the displaceable assembly of the coma die with respect to the cavity in the moving direction of the coma die, it is preferable to set in advance the forward limit position and the retreat limit position of the coma die. .

Further, a cylinder as a displacement drive source of the top mold is connected to the top mold, or the top pressure is lower than the high pressure injection pressure of the molding material into the molding space. It is preferable to connect the spring members having a repulsive force in such a configuration that the elastic force of the spring members acts in the direction of displacement of the top mold.

Further, as a method of molding a molded article using the molding apparatus, the top mold is positioned at the limit of advance, and the mold is clamped while a label having the same height as the molding space is inserted into the cavity. The positioning of the label in the mold space is achieved by the movement of the mold clamping core, the molding material is injected into the mold space using the label as an insert material, and the label is injected by the injection pressure of the molding material. The upper end is bent and formed on the outer flange piece, and the top mold is retracted to the retreat limit during the injection operation of the molding material.

The retreat movement to the retreat limit of the top mold is preferably achieved by operating a cylinder connected to the top mold or by injecting a molding material into the molding space.

[0017]

The label embedded in the outer peripheral surface of the cylindrical wall has its lower end surface densely covered with the lower end of the leg cylindrical piece, which is the lower end of the cylindrical wall.
The upper end is bent outward to form an outer flange piece, and the outer peripheral end face of the outer flange piece is densely covered with the outer peripheral edge of the flange. Deterioration does not occur early, and the label display function is favorably maintained for a long period of time.

In the case where the bottom wall having the gate opening located at the center of the lower surface is integrally formed with the cylindrical wall, the molding material flowing into the cylindrical wall forming space through the bottom wall forming space is an insert material. Flows into the cylindrical wall forming mold space while abutting against the inner peripheral surface of the label, and the inflow pressure of the forming material makes the assembling posture of the label with respect to the cavity mold surface extremely favorable.

Further, in the state of clamping the core and the cavity in which the top mold is positioned at the forward end, the height of the molding die space is equal to the height of the label. When the label is inserted and assembled in the mold space, the label is placed in the mold space in a fixed position with its lower end surface in contact with the mold surface of the top mold and its upper end surface in contact with the mold surface of the core. Will be located at
A fixed mounting of the label into the mold space is achieved.

In this state, the label inserted and assembled in a fixed posture set in the molding space has a state in which the base end of the flange space of the molding space is closed at the upper end. .

For this reason, when the molding material is injected into the mold space, the upper end of the label closing the base end of the flange space is bent outward by the injection pressure of the molding material. It becomes an outer flange piece, and the molding material is filled in the flange mold space while pressing the outer flange piece against the mold surface of the cavity.

When the injection of the molding material into the molding space progresses to some extent, the label in the molding space becomes immobile due to the injection pressure of the molding material or molding of the outer flange piece. In anticipation of the time when the label becomes immobile, the top mold is retracted to the retreat limit, and the molding material is caused to flow into the mold space newly formed by the receding of the top mold.

Since the top mold is a portion where the lower end surface of the label is in contact, a new mold space formed by retreating the top mold faces the lower end surface of the label. Therefore, the molding material flowing into the new mold space covers the lower end surface of the label.

If the cylinder is connected to the top mold, the backward movement of the top mold may be achieved by operating this cylinder at an appropriate time, or the top mold may be pushed up at a constant rate. When a cylinder that only applies force is connected, or when a spring body that applies a constant elasticity is connected, injection of the molding material that acts on the top mold while the molding space is filled with the molding material Pressure may be achieved automatically by pressure.

The retreat displacement of the die is sufficient to form a gap between the lower end surface of the label and the die surface of the retreated die in which the molding material can enter.

[0026]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an overall longitudinal sectional view showing one embodiment of a molded product 1 according to the present invention. The molded product 1 has a cylindrical wall 2 having a slightly tapered upwardly tapered taper and a cylindrical wall 2. Flange 4 continuously provided in the form of an outer collar at the upper end of
A flat bottom wall 3 having a peripheral portion connected to an upper end portion of a leg tube piece 5 which is a lower end portion of the cylindrical wall 2 in a form to close a lower end opening of the cylindrical wall 2.
And a label 7 embedded on the outer peripheral surface of the cylindrical wall 2.

The flange 4 has a width in the radial direction larger than its thickness and width, and a peripheral edge portion of the bottom wall 3 is a thick portion 6 bulging downward.

The label 7 embedded on the outer peripheral surface of the cylindrical wall 2 has an outer flange piece 8 which is an upper end thereof and is bent outward, and is embedded on the lower surface of the flange 4. Since the flange width is equal to the thickness width of the flange 4, the outer peripheral end surface of the outer flange piece 8 is covered by the flange 4. And, between the lower end surface of the label 7 and the lower end surface of the leg tube piece 5,
An interval of a dimension a into which the molding material can flow is provided,
The molding material located within this interval covers the lower end surface of the label 7. The thick portion 6 formed on the peripheral edge portion of the bottom wall 3 is thicker by a dimension a than other portions of the bottom wall 3, and the dimension a is the lower end face of the label 7 and the leg cylinder piece. 5 has a value equal to the dimension a of the gap between the lower end face 5 and the lower end face.

FIG. 2 shows an embodiment of an injection molding apparatus for molding the molded article 1 shown in FIG. 1, wherein the cavity 9 is attached to the cavity plate 11 and the cavity 9 is attached to the core plate 14. The core 9 is formed in the cavity 9 and the top mold is formed in the cavity 9.
15 is mounted so that it can move forward and backward.

The gate 12 is opened at the center of the bottom space 3 of the bottom wall 3 of the mold space 20 formed between the cavity 9 and the core 13. A ring-shaped mold surface is formed to form a mold surface extending from the periphery of the mold space to the bottom surface of the leg piece space 22, and a stopper piece 16 protruding from the outer peripheral surface is engaged with the locking step of the cavity 9. surface
A position where the rear end face abuts against the cavity plate 11 is a retreat limit.

A cylinder 18 or a spring body 19 is connected to the top mold 15 via a support rod 17. The cylinder 18 has a case where the top mold 15 is moved forward and backward by the operation of the cylinder 18 alone, and a case where a constant pressing force is applied to the top mold 15 in the forward direction. Is such that the constant pressing force is a value weaker than the injection pressure of the molding material 1 ′. The spring body 19 exerts elasticity in a direction in which the top mold 15 is advanced, and the elasticity is set to a value weaker than the injection pressure of the molding material 1 '.

The flange mold space 21 in the mold space 20 is
The width c in the radial direction is set to be larger than the thickness width b (see FIG. 3).

Next, an example of a molding procedure of the molded article 1 by the molding apparatus shown in FIG. 2 will be described. Prior to the mold clamping between the cavity 9 and the core 13, the label 7 as an insert material is inserted into the cavity 9. At this point, the loading and assembling of the label 7 into the cavity 9 does not need to be achieved in a precisely positioned state, but may be in a slightly raised state.

After the label 7 has been inserted and assembled in the cavity 9, the core 13 is relatively advanced toward the cavity 9 to clamp the mold. Due to the forward movement of the core 13 for the mold clamping, the label 7 is pushed by the core plate 14 and is accurately positioned, that is, the upper end surface is brought into contact with the core plate 14, and the lower end surface is set in the top mold. It is assembled in the cavity 9 in a state where it comes into contact with 15 (see FIG. 2).

When the molding material 1 ′ is injected into the molding space 20 through the gate 12 after completion of the mold clamping, the molding material 1 ′ is
The space flows into the molding space portion for the cylinder wall 2 from the molding space portion, and diverges to the flange mold space 21 side and the leg cylinder piece mold space 22 side to fill the molding mold space 20 sequentially.

Since the communicating portion of the molding space for the bottom wall 3 with the molding space for the cylindrical wall 2 is located at the upper end of the leg tube piece mold space 22, it has already been located in the molding space 20. The molding material 1 ′ flowing from the molding space portion for the bottom wall 3 to the molding space portion for the cylindrical wall 2 will face the lower end of the label 7 assembled in the state, and the label 7 It flows while being pressed against the mold surface, and acts to make the assembling posture of the label 7 with respect to the cavity 9 more accurate.

The upper end of the label 7 is, as shown in FIG.
Although the base end of the flange-shaped space 21 is closed, it is pushed down by the molding material 1 ′ flowing into the flange-shaped space 21 (see FIG. 4) to be formed into the outer flange piece 8.
At this time, as described above, since the width of the outer flange piece 8 is equal to the thickness width dimension b of the flange type space 21, the outer peripheral end face of the outer flange piece 8 is covered with the molding material 1 '.

In a state where the label 7 is immobilized by the molding material 1 ′ injected into the molding space 20, for example, in a state in which the outer flange piece 8 is bent and formed, it is positioned at the forward limit (see FIG. 5). ) Back the top mold 15 to the retreat limit (see FIG. 6),
A new molding space is formed below the lower end surface of the label 7, and the molding material 1 'flows into the new molding space, thereby covering the lower end surface of the label 7 with the molding material 1'.

When the cylinder 18 is connected to the top mold 15 from the forward limit position to the retreat limit position, the cylinder mold 15 is moved at an appropriate time after injection of the molding material 1 '. If the cylinder 18 applies only a certain pressing force, or if the spring body 19 is connected to the top mold 15, the molding material 1 ′ is almost completely filled in the molding space 20. This is achieved automatically by the injection pressure in the mold space 20 which rises as a result of the injection.

The amount of movement of the top mold 15 from the forward limit position to the retreat limit position may be such that a space is formed below the lower end surface of the label 7 so that the molding material 1 'can enter. Specifically, it may be about 0.5 to 1.0 mm.

[0041]

Since the present invention has the above-described structure, the following effects can be obtained. Since the upper and lower end surfaces of the label embedded on the outer peripheral surface of the cylindrical wall of the molded product are completely and completely covered with the molding material, label peeling due to exposure of the end surface, characters and patterns printed on the label, etc. It is possible to completely prevent the deterioration of the display capability of the display function part and the inconvenience such as the deterioration of the physical properties of the label itself. The display function can be maintained for a long time.

Since the final assembling of the label into the mold is achieved by using the mold clamping operation, the assembling of the label into the mold is made safe, and thus the work safety is improved. Properties can be dramatically improved.

Since the label is positioned while being supported between the core side and the cavity side, the posture in the mold space can be extremely stably and strongly held, thereby improving the quality. The molded article excellent in the above can be molded stably.

The structure is simple because the top mold is merely mounted on the cavity so as to be able to move forward and backward, and the molding operation does not require any special skill, so that the implementation is easy.

[0045]

[Brief description of the drawings]

FIG. 1 is an overall longitudinal sectional view showing one embodiment of a molded product according to the present invention.

FIG. 2 is an overall longitudinal sectional view showing one embodiment of a molding apparatus of the present invention configured to mold the molded article shown in FIG.

FIG. 3 is an enlarged vertical sectional view of a flange type space portion in the embodiment shown in FIG. 2;

FIG. 4 is an explanatory view showing a molding operation state of the portion shown in FIG. 3;

FIG. 5 is an enlarged longitudinal sectional view of a leg-shaped piece-shaped space portion in the embodiment shown in FIG. 2;

FIG. 6 is an explanatory diagram showing a molding operation state of the portion shown in FIG. 5;

[0046]

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1; Molded product, 1 '; Molding material, 2: Tube wall, 3; Bottom wall, 4; Flange, 5;
7; label, 8; outer collar piece, 9; cavity, 10;
Locking step surface, 11; cavity plate, 12; gate, 13; core, 14; core plate, 15; top mold, 16; stopper piece, 17;
8; cylinder; 19; spring body; 20; mold space;
21; flange-shaped space; 22;

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-2-45352 (JP, A) JP-A-4-33818 (JP, A) JP-A-53-137259 (JP, A) 38417 (JP, B2) JP 45-30223 (JP, B1) West German Patent Application Publication 3713710 (DE, A1) (58) Fields investigated (Int. Cl. ⁷ , DB name) B29C 45/00-45 / 84 B65D 1/00 B65D 25/36

Claims (9)

(57) [Claims] A lower end portion is a leg tube piece (5), and has a cylindrical wall (2) in which a label (7) is embedded on an outer peripheral surface without exposing a lower end surface of the label (7). An outer flange piece (8) in which an outer flange-shaped flange (4) is continuously provided on the upper end edge of the cylindrical wall (2), and the upper end of the label (7) is bent outward on the lower surface of the flange (4). A molded article with a synthetic resin label, wherein the molded article is embedded without exposing the outer peripheral end surface of the outer flange piece (8). 2. A gate (12) opening is located at the center of the lower surface, and a portion of the peripheral edge connected to the cylinder wall (2) is connected to a leg cylinder piece of the cylinder wall (2).
(5) The molded article with a label according to claim 1, having a bottom wall (3) opposed to the upper end. 3. A cylindrical mold space (20) in which an outer flange-shaped flange space (21) having a width larger than the thickness width is continuous at the upper end by clamping the mold with the core (13). Cavity
(9), a top mold (15) forming a molding surface of a leg piece space (22), which is a lower end portion of the molding space (20), is assembled so as to be displaceable along a mold moving direction. In the mold clamping state in which the top mold (15) is located at the forward limit, the height of the molding space (20) is set to a value equal to the height of the label (7) as an insert material. Molding equipment for molded products with 4. An assembly capable of displacing the top mold (15) with respect to the cavity (9) in the mold moving direction by a top mold (15).
4. The apparatus for molding a molded article with a label according to claim 3, wherein the forward limit position and the retreat limit position are set. 5. The molding apparatus for a molded product with a label according to claim 3, wherein a cylinder (18) as a displacement drive source of the coma die (15) is connected to the coma die (15). 6. A top body (15) is provided with a spring body (19) having a repulsion force weaker than the injection pressure of the molding material (1 ′) into the molding space (20). 5. The coupling according to claim 3 or 4, wherein the elasticity of the upper and lower dies acts along the direction of displacement of the top mold (15).
A molding device for a molded product with a label according to the item. 7. A top mold (15) is positioned at a forward limit, and a label (7) having the same height as a molding space (20) is inserted into a cavity (9) and clamped. Mold clamping core
Due to the movement of (13), the mold space (20) of the label (7)
Injecting the molding material (1 ′) into the mold space (20) using the label (7) as an insert material,
The upper end of the label (7) is bent and formed into an outer flange piece (8) by the injection pressure of the molding material (1 '), and during the injection operation of the molding material (1'), the top mold ( 15) A method of molding a molded article with a label that is retracted to the retreat limit. 8. The molded product with a label according to claim 7, wherein the retreating movement to the retreat limit of the top mold (15) is achieved by operating a cylinder (18) connected to the top mold (15). Molding method. 9. The molding with a label according to claim 7, wherein the retreating movement to the retreat limit of the top mold (15) is achieved by injection pressure of the molding material (1 ′) into the molding die space (20). Product molding method.