JPS60171123A - Manufacture of vessel - 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] [Technical field of invention] The present invention relates to a method for manufacturing containers for gasoline, etc.

[Prior art]

Containers of this type differ in particular from automobile tanks in that during normal use they are sealed and therefore not vented. Therefore, large internal pressures often occur within closed containers that place significant loads on the container and its closure. Additionally, the container must pass certain tests. That is, the container must remain stationary on a 20 QVc inclined plane, must not break when dropped from a height of 10 m, and must cause only a very small amount of loss of contents within a given period of time. must not exceed the required value. Now, conventional materials are sufficiently dense for use as containers for lead-containing gasoline. However, there is currently a trend towards using gasoline that is lead-free, i.e. contains other additives instead of lead (e.g. aromatics, acyclic compounds, alicyclic compounds>1).Synthetic resin containers The materials conventionally used in this invention have very serious problems, especially with respect to the above-mentioned additives, and therefore cannot meet the legal requirements.

Therefore, methods have been developed in which containers made of conventional polyethylene are subsequently coated with a blocking layer by sulfonation or fluorination. However, this layer is very thin and therefore the blocking effect is not very great. The permeability reduction achieved is up to γ%. Moreover, this figure is the one achieved for automobile tanks in which no internal pressure builds up. The above methods are unsuitable for containers, since the internal pressure accelerates permeation in the case.

[Summary of the invention]

It is an object of the present invention to provide a method for manufacturing a container which is also suitable for lead-free gasoline. In this case, this kind of container can compete with metal containers. Well, of course, manufacturing costs must be low.

The purpose is to treat acyclic compounds such as those found in gasoline,
A forest material is formed by injection molding from a first material having as low a permeability to alicyclics and/or aromatics as possible, and an outer layer, also forest-like, consisting of a second material which determines the mechanical strength of the container. This is achieved by a method characterized by spray molding the material onto a material and then molding the material to be coated into the desired container shape by blowing.

Particularly preferred materials include non-hygroscopic nylon as the first material. The second material may then include polyethylene, particularly high molecular weight polyethylene whose density ranges from medium density to high density.

The advantage of the method according to the invention lies, inter alia, in that the blocking layer is formed from a separate material, so that a correspondingly sufficient layer thickness is obtained. The outer layer is then spray molded onto the material, thereby providing a good bond between both materials, while simplifying the manufacturing process. Next, the thus obtained 90 composite material I is formed into a target container by a blowing method which is known per se. If an annular collar is formed on the open side of the first material blank, expanding radially outward and covering at least the end face of the edge of the container opening in the i&bottom forming state of the container, The first material of stock extends over the entire extent of the container containing gasoline during subsequent normal use. That is, the green formed from the outer layer in the area of the container opening is covered, so that when the lid is placed on, only the first material comes into contact with the gasoline. This is particularly important if the outer layer is constructed from polyethylene that is swollen with aromatic hydrocarbons. The protective current collar is based on the features of claim 6, which is characterized by an effect of this kind, in a manner that is expedient in terms of manufacturing technology, with at least one container handle being obtained, while: The mounting legs serve a dual purpose. That is, the installation legs firstly improve the installation stability of the container 1, and further contribute to the acceleration and improvement of the blowing process based on claim PJI Item 7.

In this way, the coated material can be easily drawn symmetrically into the blow mold, so that uneven wall thicknesses are avoided.

In accordance with claim 8, the forming process is expedited in an expedient manner and uniform stretching of each wall section is also promoted.

Other preferred embodiments of the method are set out in the following dependent claims.
#4 column is shown.

〔Example〕

A detailed description of the invention follows below with reference to the illustrated preferred implementation 131J.

The illustrated embodiment has a container 5 and is shown to scale.

In the first step of the method, the forest side ' 11 is produced by injection molding, for example from non-hygroscopic nylon. On the open side of the blank, a collar 12'f is formed which extends radially outwards and has a flange 13 which expediently returns axially. The thickness of the material 11 is 1 to 2 m.
It is sufficient if it is +.

In the second step of the method, the outer layer, also forest-like, of polyethylene is spray molded. In this case, use the corresponding spray mold and open the container when completed? forming a screw thread 16 in the range of
At the same time, the radially projecting protrusion 17.18.19
Configure. In this case, the protruding portion 1T becomes the central container handle. In this case, it is advantageous if the projecting part is at the same time configured as a clip-like holder 21 for a discharge pipe (not shown).The outer layer 14 essentially determines the mechanical strength of the container. Therefore, the wall thickness of the outer layer is correspondingly increased.

Next, a core divided vertically into two is inserted into the material 11 covered with the outer layer 14, and the material is further surrounded by a heated mold.

In this case, high-pressure air is blown into the interior of the material 11 to enhance the stretching effect. Furthermore, the above-mentioned pre-blowing operation is carried out by grasping the projection part 18.19 with a blow-type gripping member (not shown) and pulling it in the direction of the final position of said part, ie in the direction of the arrow 22.23. subsidize. The material is thus uniformly expanded within the blow mold. That is, for example, the wall on the left side will not be thinner than the wall on the right side.

Further, the protruding portions 18 and 19 will be removed when the container is completed.
Since it forms the installation foot, it is important that said part is located substantially in the area of the corner. This positioning is also achieved by the gripping members.

The blowing operation usually consists of two steps: the pre-blowing step (left) of □ above, and the next H2 step that gives the final container shape. In this case, after the pre-blowing step has been completed, the double tray split core described above is removed and the still hot and therefore deformable neck (with thread 16) is bent to the final tilted position 24. The final molding in a heated blow mold is performed while applying pressure inside the material 11. In this case, the molding process can be assisted by the suction operation. That is, by applying suction, air cushions that interfere with the final shaping are removed. The final shape of the container is shown in dashed lines in FIGS. 1 and 2. In this case, the dimensional relationships are not exact, but this does not impede understanding of the invention.

The advantage of the "composite structure" obtained by this method is that the necessary blocking layer can be constructed to have the required thickness, and the amount of this expensive material used can be kept to the required amount. The original support function is performed by the cheaper polyethylene, which does not need to have a sealing effect and can be colored and even mixed with soot, for example, to improve conductivity. Thus,
Static electricity that causes sparks is prevented. That is,
Both materials each play a different role and work together to make it possible to produce containers that meet legal and practical requirements. It may be expedient to construct the material and outer layer thicker in areas that become thinner during the blowing process, so that the desired wall thickness is obtained in all parts of the container in the final state (not shown). ). The method described above is particularly suitable for the production of 5 and 10 containers (in particular 51 containers). Since the container 10 is usually in the shape of a so-called "train container", the structure of the handle and the anchors differ from the illustrated embodiment. However, the external shape of the container influences the basic 1 composite structure. It's not a thing.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of a material coated according to the method according to the invention, and FIG. 2 is a front view as seen from the direction of arrow 2 in FIG. 11・O・・Material, 12・・・・Annular collar, 13φ9
0. Flange, 1411... Outer layer, 11-19...
...Protruding parts (handles and legs). Patent applicant Georphram 1F 41F Agent Masaki Yama (and 2 others)

Claims (1)

[Scope of Claims] (1) In a method for manufacturing containers for gasoline, etc., a first material having as low permeability as possible to acyclic compounds, alicyclic compounds, and/or aromatic compounds contained in gasoline is used. The forest-like material (11) was molded using a chemical molding method, and an outer forest-like material (14) consisting of a second material, which determines the mechanical strength of the container, was spray-molded and coated on the material (11). A method for manufacturing a container, characterized by forming a material into a target container shape using a blowing method. (2) The method for manufacturing a container according to claim 1, characterized in that non-hygroscopic nylon is used as the first material. (3) The method for manufacturing a container according to claim 1, characterized in that polyethylene is used as the second material. - (4) The method for manufacturing a container according to claim 3, characterized in that a high molecular weight polyethylene having a density ranging from medium density to highly dense is used as the second material. (5) Molding on the open side of the blank (11) an annular collar (12, 13) which extends radially outward and covers at least the end face of the edge of the container opening in the final formed state of the container; A method for manufacturing a container according to any one of claims 1 to 4, characterized in that: (6) Projecting portions (17, 18) projecting radially from the pot body to form at least one container handle and two opposing mounting legs projecting from the underside of the finished container.
, '19), characterized in that the outer layer (14) is spray-molded. (Protrusion part provided to form the 77 installation leg (18,
19) is gripped by a blow-type movable gripping member at least during the pre-blowing operation to pull the protrusion toward the final position (22, 23). Method for manufacturing the container described in Section 1. (8) In any one of claims 1 to 7, the core divided into two in the vertical direction is inserted into the material (11) and expanded during the front blow operation. 1. Method for manufacturing a container. (9) After the pre-blowing operation, the core is removed, the neck of the container opening is deformed to a predetermined inclined position (24), and then the final molding is performed using blowing pressure, and in some cases, a suction operation is also added. A method for manufacturing a container according to claim 7 or 8, characterized in that: QO) Any one of claims 1 to 9, characterized in that the material (11) and the outer layer (14), which become thinner through subsequent blowing operations, are made thicker. A method for manufacturing the container described in . The method for manufacturing a container according to any one of claims 1 to 10', characterized in that aυ5 is applied to the manufacturing of containers and IO2 containers. 12. The method for manufacturing a 5-ton container according to claim 11, wherein the clip-shaped holder (21) of the discharge pipe is also formed at the same time as the a2 container handle is formed.