JPS6077869A - Manufacture of synthetic resin tube and tube thereof - 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] The present invention has a horizontal top surface around the spout.
For more details on the manufacturing method of synthetic resin tubes and the tubes, see cavities, cores, split molds, etc.! In the JQ tube manufacturing method, a pre-manufactured cylindrical tube body is inserted into an injection mold, and a tube neck and a following shoulder are integrally molded at the upper end of the tube body. A runner for synthetic resin injection and a sprue following it are arranged on the outer circumferential side surface of the tube neck 1i1, and a predetermined edge is provided at the lower base of the spigot part or following it (ln part). The tube piece is attached to the tube body 1F by injection molding (shoulder part 1 is not injection molded).
Here and there! Featured Synthesis 4!7 (Relates to a method for manufacturing fat tubes and its products.

Conventional synthesis (method of manufacturing η1 resin tube is shown in FIG. Molding -1 by injection of 4171 fat - "
A runner 6 for injection of synthetic resin is provided above the pouring spout 5 provided at the upper end of the neck 6 at the top of the first row. The shoulder portion 4 is formed, and the lower end of this R portion 4 and the upper end of the body 2 are integrally welded to each other, and finally the lower part of the resin filled in the runner 6 is cut into a section shown by a cutting line 7. The synthesis (q1 resin tube was constructed by cutting the parts).However, in the conventional method described above, molding of the negative part 6 etc. is easy due to the good fluidity of the injection resin, but the Qll< The runner 6 that follows the spout 5 provided at the upper end of the K part must be finally cut to open the spout 5, so the cutting work is time-consuming.FF3+ (C) There will be variations in the vertical dimension. (1)) The cut surface will not be smooth and the corner lines will be sharp, so apply with the spout of the tube in direct contact with the face. (If the cut surface is slanted or not smooth, the key cover covered by it may be tilted, making it difficult to maintain airtightness.) be,
(There were drawbacks such as the poured contents remaining on the top step around the n-cut fτIX for a day.

The method and its tube according to the present invention are technologies that fundamentally improve these conventional drawbacks, and in particular, they completely eliminate the need for the above-mentioned cutting operations, and the tube around the spout is horizontal and flat. This is based on a completely new technology that allows formation of a surface or a predetermined concave curved shape.

(To specifically explain one embodiment of the method of the present invention using 4, in FIG. 2, 8 is an injection mold for carrying out the method of the present invention, 2+!, 1 core 9, The runner 6, which is composed of a mold 10, a key V bidet 11, a second core 12, an ejector turbine 13, etc., and is used for injection molding the negative part 6 of the tube container 1 and the shoulder part 4 following it, is the cavity 11. The mold 10 type membrane 0 is formed, and the sprue 14 at the tip of the runner 6 is provided at a position corresponding to the ring-shaped seat ring 15 formed on the lower outer circumferential surface of the neck part A molded by the mold 8, and further molded. The lower inner periphery of the shoulder 6 is provided with a wide-diameter receptacle 16 that can restrict the flow of injection (71) fat.

In the above embodiment, the sprue 14 was provided at a position corresponding to the seat ring 15 of the vortex 6, but this sprue 14 was located at one point 'jj'i
, it is also possible to provide it on the outer periphery of the screw root of the neck 6, as shown in green. Also, the wide diameter accommodation part 16 may be provided not only at the lower part of the negative part 6, but also at the inner peripheral part of the shoulder part 4 as shown in FIG. It is also possible to provide it on the outer periphery of. In the above embodiment, the top surface of the front part A is horizontal and smooth, and the outer corner edge 17 of the human blood outer circumference is pre-curved in a narrow range. Figure 4 -r shown in (B)
4Iu <, it is also possible to configure each into a free-formed surface such as a mountain shape or a concave shape.

11c When such a method is carried out, the resin injected through the runner 6 and the sprue 14 first reaches the seat ring 15 and the neck 6 around the sprue 140 by the action of the wide diameter receiving part 16.
The flow is filled in an annular manner to the top of the
(Through 16, it hangs down in an annular shape to the rectangle, flows radially to the shoulder part 4, and melts and welds with the upper end of the body 2 of the tube inserted in advance at the tip of the shoulder part 4. Then, the tube container 1 can be constructed.

When the method according to the present invention is carried out, (a) conventional glue [
There is no need to cut the resin for the runner, which is connected above the spout. (c)
The top surface around the neck can be formed horizontally and smoothly, and the shape of this top surface can be shaped into the shape of a yamabushi or concave shape. It was possible to curve the surface outer periphery corner to create one roundness, and (to) cut it after Ct.1) Since there is no IMS on the top surface, the content remains in this hju portion. Without fear, (g)i￥lI
The sprue provided corresponding to the outer peripheral surface of the sprue is automatically g1 checked when the neck is shaped into the 14fj4 shape by the mold, so the sprue +1! ,,IJ- is small and conspicuous/,C, (nm
``Finishing with the top 11 of the part = [flat even if it's not so good?''
It can be molded into an n-sided or curved shape, and has good molding efficiency, so the spout can be sealed in one area covered with a cap. (Since we installed a wide-diameter diaphragm u11 on the -tel (man's neck or) PJ 1fls, we calculated the velocity and resin JIa pressure of the resin flowing in the weld between the 11th part and the body.
It is possible to prevent the occurrence of Paris due to overfilling and overfilling.

[Brief explanation of drawings]

Figure 1 is an explanatory diagram of a conventional method and a tube molded by this method; Figure 2 is an explanatory diagram of Kido 11's method and a goo-yup molded by this method; It is an explanatory diagram of the work. 1 is the tube container, 2 is the body, 6 is the neck ijB, 4 is the g part, 5 is the spout, 6 is the runner, 7 is the cut 1; f +
j'ff, 8 is the mold, 9, 12 is Ko'r, 10 is the split mold,
14 is sprue, 15 is seat ring, 16 is wide diameter diaphragm j-19
It is. Patent applicant: Hyaku IIJ Kogyo Co., Ltd. Agent: Shukichi Nakagawa, Benkondo

Claims (2)

[Claims] (1) A pre-manufactured cylindrical tube body is inserted into an injection mold consisting of a cavity, core, split mold, etc., and a tube neck is attached to the upper end of this tube body. 11 (and in the subsequent method of manufacturing a tube in which the shoulder portion is integrally molded, a runner for synthetic resin injection and a sprue following the runner are arranged on the outer circumferential side of the tube piece, and The lower f++I (:1) is characterized in that by providing a predetermined constriction part at the root part or the shoulder part following this, the dupe cut part and the following <R part are integrally injection molded on the body 1t of the tube. A method for manufacturing synthetic resin tubes. (2) Orient a wide-diameter recessed part (T and one part outer circumference iM+ 7') on the inner peripheral surface of the specified part or the 111 part following this.
The top surface around the spout is injection molded to form a horizontal smooth surface or No. 1 curved surface by injection molding. A synthetic resin tube featuring these features.