KR900003734B1 - Process for the production of receptacle - Google Patents

Abstract

A tubular container with a tube body (1) of multiply foil rolled and lap-welded and comprising at least one metal layer and at least one layer of plastics material, a head piece of plastics material (3) consisting of a cylindrical neck poriton (12) and a conical shoulder portion (4), and with an annular collar (5) disposed on the inside of the shoulder portion, which is made of multiply foil with metallic intermediate layer, characaterised by the fact that the outer marginal region of the collar extends as a flange away from the remainder of the collar substantially radially in a dirction towards the tube body and is engaged on the side dirceted away from the shoulder portion by a plastics material portion directly connected with the tube body.

Description

Manufacturing method of tubular container

1 is a longitudinal sectional view schematically showing an upper portion of a tubular container formed by the manufacturing method according to the present invention.

FIG. 2 is a layout showing the arrangement of the tubular container of the tubular container shown in FIG. 1 before the plastic material is injected.

3 is a partially enlarged cross-sectional view of the device according to FIG. 2 showing the state after the tube nipple has been manufactured.

* Explanation of symbols for the main parts of the drawings

1: Tube body 1a: Upper part

2: tube tap 3: tap part

4: shoulder 5: color

6,7: slope portion 8,9: peripheral portion

11: annular part 12: neck part

13: screw 14: opening

15: horizontal portion 20: core

21: mold space 22: annular dog

23: mold or die 25: annular end

28,36: cutting surface 30: annular space

31,35: Protective layer 32,33,34,37: Plastic layer

The present invention relates to a method for producing a tubular container disclosed in Korean Patent Application No. 82-1972 (name: tubular container).

In the specification of JP 1,486,193, the specification of a cylindrical tube body formed by roll forming a plurality of thin plates, an annular disc-shaped insert having a protective layer, and the cutting edge of the insert as well as the tube body as well as the above-described insert A tubular container is described that consists of a plastic nipple formed of thermoplastic resin that is joined so as to be completely wrapped in a plastic material.

The method for producing such a container is in accordance with the method described herein as the art of heavy warfare, which is basically a method for producing a cylindrical tube body, molding an insert into a predetermined shape, and plasticizing the two members thus made. It consists of connecting and simultaneously molding the stem of the container of material.

In this type of container, there is a problem in that the gap between the outer periphery of the insert and the adjacent edge of the tube body, i.e., the gap between the plastic parts of the nipples, is kept to a minimum. This gap is an undesirable obstacle to the protective layer attached to the tube body and following the insert. In addition, a considerable amount of plastic material is required to fill the connection between the insert and the tube body. While the outer layer of the thermoplastic plastic of the tube body and the thermoplastic plastic insert are mutually welded together, the heat of welding required to form the nipple portion is supplied by the plasticized plastic material during the forming of the nipple portion. The temperature of the plasticizing plastic material resulting from the plasticizing action has an upper limit and therefore, in order to minimize the loss of the temperature of the plasticizing plastic material, the plasticizing action at the connection portion must be reduced.

This problem is solved by the present invention by providing a better welded joint, in particular a better welded joint between the nipple and the tube body, while at the same time reducing the annular gap between the protective layer of the tube body and the insert (hereinafter referred to as " Let's call it).

Solving this problem can be achieved by the manufacturing method described in claim 1 of the present application. In this way, the above-mentioned problems are solved so that the plastic material can be easily injected into the cavity mold space on the color surface away from the neck.

Due to the force generated by the injection of the plastic material, the deformation of the color such as the outer periphery of the color is struck from the core may occur. This deformation causes the annular gap between the protective layer of the tube body and the color during the forming of the nipple part. It may also be partially closed. Therefore, the plastic material injected into the cavity of the mold to form the spigot and the spigot for connecting the spigot to the tube body is not allowed to come into contact with the joint over the entire area of the joint even after the deformation of the collar is occurring or completely. Can be done. Therefore, even if the plastic material is introduced into the joint and flows on the collar side cross section which is removed from the neck, the flow is not disturbed by the outer periphery of the collar.

Compared to the known method described above, the method of the present invention can also save the manufacturing cost of the collar, since it can be performed without using a special tool to wrap the cut surface of the collar with plastic material. Finally, when the collar is placed on the core prior to the tube body, the collar acts as a deflection and concentrating surface to prevent the tube body from contacting the top portion of the core.

In order to settle the color well on the core and minimize the manufacturing tolerance of the color, the size of the center hole of the color should be below a predetermined standard and the cylindrical wheels or fins will be formed when the color is compressed on the core. It is advantageous. In this case, the protrusion or pin portion ensures that the collar is securely placed at the correct center position on the core, while allowing the plastic material to flow around the collar during molding of the plastic material portion.

The shaping of the collar under the action of plastic material is achieved by compressing it onto the hollow channel on the core, whereby the collar is shaped to the shape of the Gore, and the collar body is manufactured in the rim form by pressing the collar onto the core. The flange-shaped part is bent upward from the remaining part of the plastic material, and the plastic material is flowed around the same to be molded. Thus, the outer cut surface of the collar is bent upwards to approach the tube body.

The collar has the shape of a rotating body in its final form, and when viewed from the inside out, the collar's busbars have a portion parallel to the axis and two slopes and axes extending inclined at different angles of inclination with respect to the axis. It provides one radially extending portion, the first portion and the final portion being able to cover the surrounding surface with plastic material. The slopes extending obliquely with a greater inclination angle with respect to the axis are equal to the inclination of the shoulders made of plastic material.

The invention will now be described in detail with reference to the accompanying drawings, but the invention is not limited to the illustrated embodiment.

The tubular container shown in FIG. 1 consists of a cylindrical tubular body 1 having a multi-layered structure made in a known manner, only a part of which is shown. In general, this is a structure in which a thermoplastic plastic layer is double-sided, and an intervening or adhesive layer is further inserted between the metal and the plastic layer through an intermediate layer of metal therebetween. The inner plastic layer is intended to prevent the contents from contacting the metal so that no harmful chemical reactions occur. The metal or protective layer, for example, prevents certain components of the contents from spreading through the tube body 1, thereby preventing the effects that may occur in the pure plastic container when the contents have diffusing components. The plastic layer located outside the tube body prevents the metal layer from corrosion and makes the outside of the container beautiful.

The tube body 1 is generally manufactured by roll forming with this kind of multilayer sheet, and the joint ends of the multilayer sheet are overlapped and welded (not shown). The upper end 1a of the tube body 1 is slightly bent inward to form the finish of the container and form a curved transition in the tube nipple indicated by the sign 2.

The tube nipple 2 consists of a nipple portion 3 of thermoplastic plastic material and a collar 5 which is approximately conical. The collar 5 is manufactured by a similar method with the same multilayered sheet metal as the structure of the tube body. The problem now is to make the metal layer of the color continuous with the diffusion barrier layer attached to the tube body 1 at the tube nipple 2. The last problem is to have the stem 3 of the thermoplastic plastic material support the collar 5 and connect the stem to the tube body 1. In order to solve this problem, the stem portion 3 has a conical shoulder 4.

As shown in detail in FIG. 1, the collar shown in the longitudinal section is provided with peripheral portions 8, 9 embedded in a plastic material constituting the bevel portion 3 and the slope portions 6, 7 having different inclinations. The embedding of the peripheral parts 8 and 9 in the plastic material is to protect the contents by cutting the multilayer surface of the metal layer exposed during the cutting or pressing as a plastic material to protect it from the contents and to prevent undesirable reaction between the active contents of the metal and the contents. Its purpose is to prevent it from happening.

The stem part 3 is connected to the upper end la of the tube body 1 by the shoulder 4 and the inner surface is welded to the plastic layer of the tube body. The connecting portion between the shoulder 4 and the tube body 1 does not extend from the front of the upper end of the tube body 1 to the height of the periphery 9 of the collar 5 in accordance with the concept of the present invention, but the periphery 9 ) Extends to the annular plastic material portion 11 below. In this part the annular plastic material part 11 fixes the collar 5 at its periphery 9 and is connected by melt welding to the plastic layer of the collar facing the interior of the container. Finally, a layer of plastic material on the top surface of the collar 5 is deposited on the shoulder 4 on the slopes 6, 7.

The nipple portion 3 also has a neck portion 12 which is connected to the shoulder 4 and has an external screw 13 formed therein, the upper portion being closed by a horizontal portion 15 with an opening 14. . The screw 13 secures a conventional screw cap (not shown), and the screw cap closes the opening 14.

2 and 3 show a plant for manufacturing the tube nipple 2 and a plant for connecting the collar 5 and the tube body 1 with the plastic material of the shoulder 4. An exemplary process is described according to this figure. Parts similar to those of the first diagram are lit with the same code.

Reference numeral 20 denotes a core member movable relative to the mold or die 23, which is capable of moving in the axial direction even if it does. The core 20 together with the mold 23 forms a cavity mold space 21 for forming the tube nipple 2. 2 shows that the cavity mold space 21 is closed. That is, the core 20 shows that its end is in a position coupled to the mold 23, where the tube nipples 2 and nipples 3 each take their final shape.

In the state where the core 20 is separated from the mold 23 and the molding space is opened, a plurality of layers of thin plates are stamped and punched to compress the preformed collar 5 onto the core. From the planar annular disk a conical hollow body with slopes 6 and 7 is formed by stamping. When the collar 5 is compressed on the core, the collar is deformed so that its inner diameter is smaller than the diameter of the annular step 25 formed on the core 20, and a cylindrical peripheral portion 8 is formed. .

As shown in detail in FIG. 2, the collar 5 is positioned such that the slope 7 rests on the annular shoulder 22 and the annular end 25 which is slightly larger than the annular end. A radial gap occurs with respect to the cavity channel 29, thus forming a cavity channel 29 between the shoulder 22 and the annular end 25. As shown in FIG. The importance of this form is demonstrated below. When the tube body 1 is placed on the core 20, the collar 5 has a concentrated action of guiding it in place when the tube body is not placed at a predetermined position on the core so that the tube body is wrinkled. prevent. In FIG. 2, the upper end 1a of the tube body 1 protruding into the closed cavity mold space 21 is shown curved inwardly. This form of the tube body is achieved by entering the mold space 21 together with the core 20. In FIG. 2, reference numeral 39 schematically shows a pin coaxial with the core 20 and mounted to the core or mold 23 in a manner not shown.

When the cavity mold space 21 is open, plastic material can be expected to flow into the hollow space. As an example, the process described in published British Patent Application No. 8002044 may be referred to in this regard. In that case, the core 20 is located on the mold 23 which is open at the top. When closing the cavity mold space, the plastic material entering the cavity mold space, for example in the form of a ring of plasticizing material, is separated and flows towards the pin 39 on the one hand to form the neck 12, and on the other hand The plasticizing plastic material moves radially outward to reach the connection with the tube body 1. At this point, if the cavity mold space is completely closed or the part is brought to the comparative position shown in Fig. 2, the plastic material moved outwards will be separated from the upper end la of the tube body 1 and the collar 5 indicated by 28. It flows into the annular space 30 relatively without resistance between the cut surfaces. When the plastic material reaches the annular space 30, the pressure of the plastic material increases on the slope 7 of the collar, so that the slope 7 is bent between the annular dog 22 and the annular end 25. It is press-fitted into the joint channel 29 located in between. By bending the collar inwardly, the portion of the collar extending radially outward is deformed. The portion on the cut surface 28 which extends completely radially is bent to the approximately horizontal position from the inclined position shown in FIG. Thus, the radial cross section shown in FIGS. 1 and 3 is formed.

As can be clearly seen from the comparison between FIG. 2 and FIG. 3, the deformation of the collar 5 causes the plastic material in the annular space 30 to also reach the bottom face of the collar and the periphery 9, which comprises the cutting face 28, is thus It will be buried in the plastic material.

In this way, the cut surface 28 of the metal protective layer 31 of the collar 5 is covered with a plastic material, which is bonded to the plastic layers 32, 33 of the collar 5. As described above, melt welding is also made on the inner plastic layer 34 of the tube body 1 over the entire joint, and the plastic material of the shoulder 4 is also protected on the cut surface 36 of the tube body. It flows over and engages with the outer plastic layer 37 of the tube body 1. In the present invention, however, the annular spacing 5a between the cutting surface 28 and the tube body 1, which is closed only by the plastic material by extending its periphery 9 close to the tube body 1 even though it is coated with the plastic material, It is also important to minimize it. The remaining annular spacing between the protective layer of the tube body 1 and the protective layer 31 of the collar 5 can then be ignored.

The cylindrical peripheral portion 8 of the collar 5 formed when the collar 5 is mounted on the core 20 protrudes over the annular end 26, which is also embedded in the plastic material forming the neck 12. Thus, the cut surface 27 is covered when welding is performed on the plastic material layers 32 and 33.

The method of the present invention can significantly reduce the manufacturing cost compared to the container manufactured by the conventional method, mainly because the color can be produced in the final form by a simple method without using any special tool or molding process. . The collar is of the type necessary to be embedded in the plastic material when forming the tube nipples (2) and the nipples (3).

Claims (9)

The stem body of plastic material composed of a tubular body 1 and a cylindrical neck 12 and a conical shoulder 4 formed by roll forming a plurality of thin plates composed of one or more metal layers and one or more plastic layers and overlap-welding the joint ends. (3) and a tubular container provided with a single-colored collar (5) placed on the inner side of the conical shoulder (4) and made of a multi-layered sheet of metal with an intermediate layer, the cut surface being buried in a plastic material forming the shoulder (4). In order to form a roll, a multi-layer thin plate is roll-molded and overlap-welded to produce a cylindrical tube body, and a color produced by stamping a multi-layer color thin plate to form a diffusion protective layer together with the tube body is one core. Place the core with the tube body and color into the mold and form a cavity with the core to fill the cavity with the core. A method of manufacturing a container comprising the steps of placing and entering a tube body into this space and injecting plastic material into the mold, wherein the color is converted from the preform to the finished form by the injection of the plastic material. Method for producing a container. The method of manufacturing a tubular container according to claim 1, wherein the outer edge of the collar is held in close contact with the annular shoulders and the annular ends respectively radially arranged on the core by the molding pressure of the plastic material. The method of manufacturing a tubular container according to claim 1 or 2, wherein the plastic material and the collar are completed by closing the cavity mold space due to the inflow of the plastic material. The method of manufacturing a tubular container according to claim 1, wherein the collar is pressed against the core to form a cylindrical peripheral portion bent from the body of the collar. 5. A method of manufacturing a tubular container according to claim 4, wherein a peripheral portion bent from the main body of the collar and separated from the cylindrical peripheral portion is formed in the process of deforming the collar from the preliminary form to the finished form by the plastic material. The method of manufacturing a tubular container according to claim 1, wherein the molding of the collar is performed by pressing the collar onto the core. 2. A method according to claim 1, wherein the periphery of the collar is bent from the cone to form a flange that is substantially radial to the tube body. A stem body of plastic material composed of a tubular body (1) formed by roll forming a plurality of thin sheets composed of one or more metal layers and one or more plastic layers and overlapping welded joints, and a cylindrical neck (12) and a conical shoulder (4). (3) and a tubular container having an annular collar (5) which is located on the inner side of the conical shoulder (4) and is made of a multi-layered sheet of metal with an intermediate layer and whose cut surface is embedded in a plastic material forming the shoulder (4). Apparatus for producing a tubular container having a core that can be inserted into a mold to form a tube, wherein the apparatus is provided with a common channel on a core surface extending in rotationally symmetry about an axis of the core. Apparatus for manufacturing a container. 9. A device according to claim 8, wherein there is an annular end around the neck of the core.

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