JPH01500257A - Container and its forming method - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Container and its forming method Technical field The present invention provides a hollow container that integrally has a handle for lifting, and a thermoplastic material for the hollow container. It relates to a method of manufacturing from plastic raw materials.

Background technology Large hollow containers, such as cylindrical containers with a capacity of 55 gallons, are made from thermoplastic raw materials. For fabrication, it is generally an extruded hollow tubular preform, or paris. It is made by blow-molding Son. The parison is open blow molding Blow air into the parison after it is placed in a mold apparatus and the mold apparatus is closed. and expand the parison toward the wall of the mold device. General handling Lifting handles or rotating protrusions are placed around the molded container to facilitate Preferably, a rim is provided.

The lifting handle may consist of a ring placed around the entire circumference of the container. Frequently, this ring also acts as a rotating lip.

Blow-molded thermoplastic hollow containers with lifting surfaces or handles For large containers, such as 0 cylindrical containers, where various methods of attachment are used, A prefabricated rotating annular body is placed in a blow mold, and the parison is expanded. It is sometimes known to weld the annular body to the cylindrical container. However, that In the case of a cylindrical container having such a structure, the annular body may fall off from the cylindrical container during handling. . In order to eliminate this kind of falling off, a hole is formed inside the mold cavity, and this hole is A method is adopted in which a portion of the thermoplastic material of the parison is forced into the container. The groove is It is shaped by the movable member of the mold. The plastic raw material is pushed into the clear part. After this, the movable member presses the plastic material into a predetermined shape of a protruding edge or handle. Shrink. The latter method is described, for example, in U.S. Pat. 9.570.

However, this type of container has the disadvantage that the part where the protruding edge joins the container is weak. be. Therefore, the thickness of the wall of the container in the area where the protrusion is provided by increasing the amount of raw material Although it has been proposed to increase the overall wall thickness of the container, the addition of such material This would increase the thickness to an undesirable thickness. Therefore, this form of manufacturing method Therefore, there are restrictions on the thickness of the ring and where it can be installed. Furthermore, due to stress To minimize cracking, the compression-formed ring is We use low raw materials (approx. 2HLMI) of However, it is difficult to manufacture using conventional extrusion molding equipment.

An example of a manufacturing method for welding or bonding a rotating projecting edge to a plastic container is shown in U.S. Patent No. 3, No. 960.474. In this invention, a preformed protruding edge or places the toroid in a blow mold and inflates the parison to make the parison more flexible. The thermoplastic raw material and the preformed protruding edge are bonded together. However, Therefore, the connection between the protruding rim and the container is achieved by the thermoplastic material of the parison adhering to the material of the protruding rim. It depends on the ability to lift a container filled with its contents by a protruding edge. It is known that under stress, the above-mentioned bonds break apart.

The present invention improves the conventional method of forming containers with projecting edges or lifting handles. The purpose is to solve the above-mentioned problems.

Disclosure of invention The present invention provides a plastic container having an integral lifting surface formation in one mold. A method of forming a plastic material, the method comprising: A parison made of the first plastic material is blow-molded to form a container body at a temperature of (b) forming a lifting surface formation in the recess of the mold; inserting a sufficient amount of solids of the second plastic material to (c) During the blow molding of the container, the above-mentioned second plastic raw material is added at a position adjacent to the container. Compression molding, the second plastic material and the first plastic material are combined while both materials are melted together. Process of fusing with sexual raw materials The present invention provides a molding method comprising:

The present invention also provides a parison made of thermoplastic raw material placed in a blow mold. A plastic container with an integral lifting handle formed by blow molding. It provides equipment. The handle is connected to the blowing mold and the thermoplastic material is During the container blow molding process, the material is compression molded into a predetermined handle shape. The thermoplastic raw material is connected to the parison raw material while both are in a molten state. The raw material, which is pressed into the shape of a handle, fuses with the raw material in the container, creating a fused and integrated joint. It is formed.

Brief description of the drawing FIG. 1 is a schematic side view showing a partial longitudinal section of a mold device for molding the container shown in FIG. side view, FIG. 2 is a view similar to FIG. A flexible tube (parison) is introduced and the melt extrudate is inserted into the mold. A diagram showing the state Figure 3 is a view similar to Figure 2, with the mold closed and blow molding started. A diagram showing a state in which the process has been completed but has not yet been completed. Figure 4 is a view similar to Figure 3, showing the container and mold after the container is completely formed. diagram showing, FIG. 5 is a view similar to FIG. 4, showing a state in which the mold is opened after forming the container. , Figure 6 is a perspective view of a container molded by the above manufacturing method, and Figure 7 is a perspective view of a container molded by the above manufacturing method. FIG. 3 is a partially enlarged cross-sectional view of a more shaped integral connection.

The best form for putting your invention into practice Referring to the drawings, FIGS. 6 and 7 show a container 8, which is generally cylindrical. It has a shaped side wall 10, an upper part 12, and a bottom wall 12a (in FIG. (only top wall 12 is shown), top wall 12 may include one or more distribution ports or outlets. An outlet 11 may also be provided.

The container 8 has a handle ring 14 integrally fixed to the upper corner, and the ring 14 consists of a main part 16 and a thin flange part 18 that is connected to the main body of the container 8. There is.

Ring 14 may also be a rotating lip. Ring 14 is for lifting the container Or it can be used to support when rotating the container. Furthermore, the ring 14 is In the example shown, it is provided on the upper surface of the container 8, but it may also be provided on other positions of the container 8. It is possible and also possible to provide a plurality of rings 14.

FIG. 7 shows the longitudinal direction of the joint between the container 8 and the ring 14 formed by the method described above. A cross-sectional view is shown. Ring 14 and flange portion 18 are pressed into the shape shown. It is shrunk and molded. During this compression molding process, the flange portion 18 is As shown in the figure, it is extruded from the closed part of the mold and into the thermoplastic material in container 8. Infiltrate.

By selecting the raw materials for the ring 14 and the container 8 from among known thermoplastic raw materials, The bond obtained as a result of molding is essentially a molecular bond, i.e. the bond is It is indistinguishable from the surrounding raw materials, and the joints have the same strength as the raw materials. As the plastic raw material, for example, a high-load melt index of 5 to 10 (mel Preferably, high-density polyethylene resin having a The ring 14 and the container 8 may be molded from the same type of thermoplastic raw material.

In the illustrated example, the portion pushed out from the ring 14 has entered the raw material in the container 8. , rather than the raw material of one component being forced into the raw material of another component, It may be desirable for the material in container 8 to penetrate into ring 14. more containers It is also possible to forcibly infiltrate the raw material No. 8 into the ring 14. Furthermore, the present invention The big advantage is that by using different raw materials for the container and ring, it is possible to add additives. The ring 14 can be colored.

By coloring the ring 14, containers can be identified by the color of the ring. By adopting a color code system, the contents of the container can be immediately identified.

Since the extruded part where the ring 14 is formed is provided separately, it can withstand heavy loads. Correspondingly, the thickness of the ring 14 can be made as thick as required. Furthermore, ring 1 4 can be provided at any position in the container 8. Providing the ring 14 on the top Therefore, the discharge port 11 can be protected. Molding method with reference to Figures 1 to 5 Let me explain the law in more detail. Figures 1 to 5 show the blow molding operations as well as the following. The blow molding is of a conventional type except that it has structural parts used for insert compression molding operations. A molding device 20 is shown.

The blow molding mold assembly rI120 includes a pair of side members 22 that can be separated from each other, and a side member 22 that It has a pair of end members 28 that can be moved into and out of contact with the member 22. Each side member 22 is It integrally has a substantially semi-cylindrical side wall portion 24 and a substantially semi-circular end wall portion 26. end Although the wall 26 is shown at the top in the illustrated example, the end wall 26 forms the bottom of the container.

This is because the container is molded upside down.

The end wall portion 26 has an annular projection or flange 17 formed on the bottom of the container 8. A circular recess 25 is provided. Each side wall portion 24 has opposite end portions. Or, it has an annular recess 27 below the position shown in the figure. This recess 27 together with two annular recesses provided in the end member 28, an annular recess having the following purpose: Forms 4 parts. The end member 28 of the blow mold apparatus has a substantially semicircular shape; It is arranged so as to correspond to the end wall portion 26 of the side member 22.

As mentioned above, each end member 28 has a recess 2 on its outer periphery facing axially inwardly. 9, and this recess 29 has 01! of the side member 22. installed on the I wall section 24 In order to provide the container handling ring 14 together with the recess 27 by the following method. An annular groove is formed to contain the necessary raw materials. Shape of recess 27 and recess 29 and the size can be changed as appropriate.

A known extrusion molding machine X is arranged above the blow molding die. This push Molding I! From It will be done.

A blowing device with a blowing pie IB is arranged at the lower end of the blow mold. . The extruder and blow pipe equipment are similar to those used in traditional blow molding equipment. It may be horizontally similar to the above, and the measuring part is not shown in the figure.

As shown in FIGS. 1 and 2, the blow mold apparatus 20 is first placed in an open state. be placed in a state of Molten plastic extrusion molding is performed in the recesses 27 and 29 of the mold device 20. Object E is inserted.

At approximately the same time that extrudate E is placed into mold 20, as shown in FIG. As shown, the parison P from the extrusion molding machine X reaches the blowing vibrator B at its lower end. It is extruded and placed.

The side members 22 are shown in FIG. 3 approaching each other and pinching the ends of the parison. Pressurized air is blown into the center of the parison through the blow pipe B. Molding of the container begins using conventional blow molding methods.

The mold end pieces 28 are brought closer together while air is blown and the container is molded. , further moves in the direction of the side member 22, and as shown in the fourth section, the melted plastic press The molded product E is compressed by the end member 28 and side member 22 of the mold for handling. It is formed into a ring 14.

Therefore, at the same time that the container body is formed using the blow molding method, the handling ring is A ring 14 is formed by a compression molding method, and the ring 14 is formed into the main body of the container 8. is joined to the adjacent position. As a result, the ring 14 becomes an integral part of the container 8. Become. Accordingly, the present invention provides an alternative to conventional methods of forming hollow containers with handling rings. The present invention contemplates an improved method for forming hollow containers that eliminates many of the drawbacks. process At the end, the mold member is opened to remove the completed container as shown in Figure 5. This is a very detailed process.

Although the container described above is provided with only one ring in the upper corner of the container body, If necessary, use the same method to create a set of rings, one at each end of the container. can be molded. You can also place rings in other locations on the container as needed. Can be combined. Additionally, the ring 14 in the illustrated example is shown in a continuous configuration. But non-3! It is also possible to arrange a continuous handle. Circumferential direction of recess 27 and recess 29 Multiple, spaced lifting handles by limiting the range of A container 8 having a shape can be formed. In addition, there are surface formations for lifting. Alternatively, the preferred method for the rotating protrusion is shown in the figure, but the recess 27 and the recess By changing the shape, position and size of the members determined by Other shapes of raised edges or lifting surface formations are possible.

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Claims (10)

[Claims] 1. A plastic container with an integral surface formation for lifting the container can be made in one mold. In the method of forming, this method (a) The first plastic material is heated under a constant controlled temperature so that the plastic material takes on a predetermined container shape. (b) forming a container body by blow molding a parison made of plastic raw material; a sufficient amount of solids to form a lifting surface formation within the recess of the mold; Step 2 of inserting the plastic raw material; (c) pressuring said second plastic material at a location adjacent to the container during blow molding of the container; While shrink molding and both materials melt together, the second plastic material is added to the first plastic material. The process of fusing with sexual raw materials and A method for forming a container, characterized by comprising: 2. a pair of side members that can be separated from each other; and a pair of side members that can be adjacent to each other and that the side members In a mold having a pair of end members on substantially the same plane that can be moved into and out of the member, a plastic hollow body having a flange extending outwardly from the vessel and integrally secured to the vessel; In the method of forming a container, the method includes: (a) when the mold is open, each adjacent side member and end member of the mold inserting the molten plastic extrudate into the groove formed by the recess; (b) extruding a plastic parison between the mold members; (c) the side members approach each other and the end member moves toward the side member; The mold is closed by closing the opposite ends of the parison; forming the flange by compressing the extrusion between the side member and the end member; The process of (d) Pressurized air is introduced into the parison in the mold, and the raw material of the parison is transferred to the mold. The hollow container is formed by pressing against the mold member, and at the same time the flange is pressed against the hollow container. a process of welding to the container; A method for forming a container, characterized by comprising: 3. the container is tubular and the flange is a peripheral flange extending perpendicularly from the container; 3. The method for molding a container according to claim 2, wherein the container is a plastic container. 4. a pair of side members that are separable from each other, and the side members that are separable from each other; In a mold having a pair of end members on substantially the same plane that can be moved into and out of the member, a generally cylindrical hollow body with an integrally fixed ring extending radially outwardly of the vessel In the method of forming a container, the method includes: (a) when the mold is open, each adjacent side member and end member of the mold inserting the molten plastic extrudate into the groove formed by the recess; (b) extruding a plastic parison between the mold members; (c) the side members approach each other and the end member moves toward the side member; The mold is closed by closing the opposite ends of the parison; forming the ring by compressing the extrusion between the side and end members; process and (d) Pressurized air is introduced into the parison in the mold, and the raw material of the parison is transferred to the mold. The ring is pressed against the mold member to form the hollow container, and at the same time the ring is pressed against the hollow container. The process of welding to the vessel A method for forming a container, characterized by comprising: 5. Plasticity molded by blow molding a parison of thermoplastic raw material in a blow mold In the container, the container integrally has a lifting handle, and the handle is made of metal. By compression molding the thermoplastic raw material into the shape of the specified handle at the point connected to the mold. The thermoplastic raw material is bonded to the container during the container blow molding process, and the thermoplastic raw material is The material is pressed against the material while both are in a molten state, and the material is formed into a handle shape. Plasticity characterized by fusion with the raw material of the container to form a fused and integrated bond container. 6. The plastic raw material preferably has a high load melt index (melt index) of 5 to 10. index) of a high density polyethylene resin having a Container according to scope item 5. 7. The container is generally cylindrical and the lifting handle extends circumferentially around the top corner of the container. 6. A container according to claim 5, characterized in that: 8. Claims characterized in that the raw material of the handle is embedded in the raw material of the container Container according to paragraph 5. 9. Claims characterized in that the raw material of the handle forms a molecular bond with the raw material of the container. Container according to scope item 5. 10. A claim characterized in that the raw material for the handle has a different color from the raw material for the container. Container according to scope item 5.