KR20230040585A - Molds with runners and gates for filling molded resin in tampon applicators - Google Patents

Abstract

A mold with a runner and a gate for filling molding resins of a tampon applicator, according to the present invention, comprises: a first mold unit which has a plurality of applicator molding units for molding a tampon applicator; and a second mold unit which is coupled with the first mold unit to form a resin injection guiding unit for injecting resins prepared through a hot runner from a sprue bush to the applicator molding units. The resin injection guiding unit comprises a plurality of unit resin injection units comprising: a first runner unit which is connected to the sprue bush; first and second distribution runner units which are extended from one end portion of the first runner unit; third and fourth distribution runner units which are extended from the other end portion of the first runner unit; arc-shaped pressure distribution runner units which are formed from the first, second, third and fourth distribution runner units, respectively; and first and second gate units which inject resins to a cavity of the applicator molding units from both end portions of the pressure distribution runner units. According to the present invention, it is possible to fundamentally prevent molding defects due to imbalance of injection amount and pressure when injecting resin into an applicator molding unit.

Description

Molds with runners and gates for filling molded resin in tampon applicators }

The present invention relates to a mold, and more particularly, to a mold having runners and gates for filling resin for molding tampon applicators with improved runners and gates for filling resin for molding tampon applications.

In general, in an injection mold, an upper mold and a lower mold are mutually molded to form a cavity identical to the shape of a product to be molded, and a molten resin is injected into the cavity at high pressure to mold the product.

In this process, if the shape of the product to be molded is complicated and the mold separation is not possible during molding as the upper and lower molds, a slide core is installed to mold the part where the upper and lower molds are not separated from the mold.

On the other hand, the embedded thin-film part, such as a case for accommodating an insert-type sanitary napkin disclosed in Korean Patent Publication No. 10-2013-0134155, is a capsule of a product inserted into the human body, and the surface must be smooth, and foreign substances or fine burrs must be removed. If it occurs, it can cause serious side effects, so an ultra-precise mold structure is required.

And Korean Patent Registration No. 10-1542949 discloses an applicator and an injection mold for molding the applicator.

A tampon applicator for an insert type sanitary napkin, which is a deep thin film product, is molded by injecting resin into cavities of a plurality of unit molds. This molding has a problem in that a difference in injection pressure occurs for each cavity due to a difference in injection resistance injected through the sprue bush and the runner.

This difference in injection pressure has a problem in that it acts as a main cause of molding defects of tampons of thin film products.

Republic of Korea Patent Publication No. 10-2013-0134155 Republic of Korea Patent No. 10-1542949, Republic of Korea Patent Publication No. 2010-0083573

The present invention is to solve the above-mentioned problems, and since resin for molding can be injected with uniform pressure into a plurality of unit molds for molding tampon applicators, which are thin film products, it is possible to prevent molding defects. It is to provide a mold having a runner and a gate for filling molding resin.

In order to achieve the above object, the mold having a runner and a gate for filling the molding resin of the tampon applicator of the present invention is coupled with the first mold part having a plurality of applicator molding parts for molding the tampon applicator, and the first mold part A second mold part forming a resin injection guide part for injecting resin prepared from the sprue bush into the applicator molding parts through the heart runner,

The resin injection guide part includes a first runner part connected to the spruce bush, first and second distribution runner parts extending from one end of the first runner part, and a third extending from the other end of the first runner part. For injecting resin into the cavity of the applicator molded part from both ends of the 4 distribution runner part, the semicircular pressure distribution runner part formed from the first, second, third, and fourth distribution runner parts, respectively, and the pressure distribution runner part It is characterized by having a plurality of unit resin injection parts including first and second gate parts.

In the present invention, the resin injection guiding parts constituting the resin injection guiding part further include a connection runner part that is connected to each other so that they can be smoothly drawn out, and the first and second gate parts have a tapered structure toward an end side.

The mold having a runner and a gate for filling the molding resin of the tampon applicator according to the present invention can fundamentally prevent molding defects due to non-uniform injection amount and injection pressure when resin is injected into the applicator molding part for molding the tampon applicator. .

In particular, the present invention can increase the freedom of design in designing a mold having a runner and a gate for filling the molding resin of the tampon applicator.

1 is a perspective view of a tampon applicator for molding using a mold having a runner and a gate for filling the molding resin of the tampon applicator according to the present invention;
Figure 2 is a perspective view of a mold having a runner and a gate for filling the molding resin of the tampon applicator according to the present invention;
Figure 3 is an enlarged perspective view showing an extract of the main portion shown in Figure 2;

The present invention relates to a mold having a runner and a gate for filling a tampon applicator with molding resin, and an embodiment thereof is shown in FIGS. 2 to 3.

Referring to the drawings, the mold 10 having a runner and a gate for filling the molding resin of the tampon applicator according to the present invention has a black rim at one end of the thin film product, that is, the cylindrical body 101 as shown in FIG. It is for shaping the tampon applicator 100 having a head portion 103 formed with 102 and divided lips 104 formed at the other end.

The mold 10 having a runner and a gate for filling the molding resin of the tampon applicator includes a first mold part 20 having a plurality of applicator molding parts 30 for molding the tampon applicator 100, and the first A second mold for forming a resin injection guide part 50 coupled to the mold part 20 to inject renjin into the applicator molding parts 30 from the spool bush 41 through the heart runner (not shown) It has part 40. Non-explained numeral 100 is a cut showing a chip generated after molding the tampon applicator by injecting resin into the applicator forming unit 30 through the resin injection guide unit 50.

The mold according to the present invention configured as described above will be described in more detail for each component as follows.

A plurality of applicator molding parts 30 are provided in the first mold part 20 of the mold 10 having a runner and a gate for filling the molding resin of the tampon applicator according to the present invention. Each applicator molding part 30 has Injection molds (not shown) for molding each tampon applicator are installed.

The structure of the injection mold is described in Korean Patent Registration No. 10-1542949 and Korean Patent Registration No. 10-0932249, filed and registered by the present inventor.

The posted injection mold has a first mold member having a first hollow part for forming a cavity in the longitudinal direction and having at least two resin inlets for injecting resin on the outer circumferential surface, and a molding space that is molded with the upper end of the first mold member A second mold member constituting a part of, a first core member coupled to the second mold member and extending into the first hollow part to form a first molding hole, and coupled to the lower portion of the first mold member to form the first mold member. It may have a configuration including a third mold member in which a second core member that seals the first molding space and is coupled to the first cover member to form an undercut portion is installed.

Meanwhile, as shown in FIGS. 2 and 3 , the resin injection guide part 50 is for injecting resin into the applicator molding parts 30 through the heart runner, and the sprue formed in the second mold part 40 A first runner part 51 connected to the bush 41 and first and second distribution runner parts 52 and 53 extending from one end of the first runner part 51 are provided. Also, at the other end of the first runner unit 51, 3.4 distribution runner units 54 and 55 extending therefrom are formed. The distances from the connection part between the first runner part 51 and the spruce bush 41 to the ends of the first, second, third, and fourth distribution runner parts 52, 53, 54, and 55 are substantially the same. Preferably, the cross-sectional area at the end side of the first, second, third, and fourth distribution runners is also formed the same.

And, as shown in FIGS. 2 and 3, at the end side of the first, second, third, and fourth distribution runner parts 52-55 constituting the resin injection guide part 50, along the circumference of the first mold member 31 Semicircular first, second, third, and fourth pressure distribution runner parts 56, 57, 58, and 59 are formed. The first, second, third and fourth pressure distribution runner parts 56-59 are formed in the same shape and size as each other. The first, second, third, and fourth pressure distribution runner parts 56 to 59 are formed to be positioned within the same radius from the center of the first mold member 31, respectively. First and second gate parts for injecting resin into the cavity of the injection mold installed in the tampon applicator part 30 at both ends of the first, second, third, and fourth pressure distribution runner parts 56-59 ( 61) (62) are formed. The first and second gate parts 61 and 62 are preferably installed at a predetermined angle with respect to the center of the first mold member 31 . The first and second gate portions 61 and 62 have a tapered structure toward the end in order to improve the injection speed at the injection end.

Meanwhile, since a plurality of applicator molding parts 30 are installed, a plurality of resin injection guide parts 50 are formed between the first and second mold parts. A connection runner part 65 for interconnecting the renjin injection guide parts 50 is further provided. The cross-sectional area of the connection runner part 65 is preferably formed to have the same cross-sectional area as the cross-sectional area of the first runner part 51 .

The operation of the mold having a runner and a gate for filling the molding resin of the tampon applicator according to the present invention configured as described above will be described.

In order to form the tampon applicator 100 using a mold having a runner and a gate for filling the molding resin of the tampon applicator according to the present invention, melted in the spruce bush 31 through a heart runner (not shown) Resin is injected with a predetermined pressure. As described above, the resin injected through the spruce bush 31 flows into the first runner part 51 and then moves to both ends to both sides. The moved resin is moved through the first, second, third, and fourth distribution runner parts 52-55 branched from the first runner part 51, and then the first, second, third, and fourth runner parts connected thereto. It moves along the pressure distribution part 56-59.

In the process of moving as described above, the distance from the spr bush 41 connected to the first runner part 51 to the ends of the first, second, third, and fourth distribution runner parts 52 to 55 is the same, , cross section also has the same structure, so the movement resistance of the resin becomes uniform. And, the resin moved through the first, second, third, and fourth pressure distribution parts 56-57 first and second gate parts 61 and 62 installed in the first, second, third, and fourth pressure distribution parts, respectively. Through this, it is introduced into the injection mold for molding the tampon applicator from both sides.

Therefore, since the injection into the cavity for molding the tampon applicator, which is a thin film product, is performed through the first and second gate parts 61 and 62 at the same pressure, the resin is injected into the cavity of the injection mold. Defects can be prevented, and furthermore, molding defects of the tampon applicator can be prevented.

In particular, since the first and second gate portions 61 and 62 have a tapered structure toward the end, it is possible to speed up the inflow of resin into the cavity and improve fluidity.

As described above, the mold having a runner and a gate for filling the molding resin of the tampon applicator according to the present invention can fundamentally prevent molding defects due to poor injection of resin during molding of the tampon applicator, which is a thin film product, and furthermore, the tampon applicator The productivity of the catter can be improved.

Although the present invention has been described with reference to the embodiments shown in the drawings, this is only exemplary, and those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. Therefore, the true technical protection scope of the present invention should be determined by the technical spirit of the attached registered claims.

Claims (3)

A first mold part having a plurality of applicator molding parts for molding tampon applicators, and a resin injection guide part for injecting resin prepared from the sprue bush through the heart runner into the applicator molding parts coupled to the first mold part. It has a second mold part to form,
The resin injection guide part includes a first runner part connected to the spruce bush, first and second distribution runner parts extending from one end of the first runner part, and a third extending from the other end of the first runner part. For injecting resin into the cavity of the applicator molded part from both ends of the 4 distribution runner part, the semicircular pressure distribution runner part formed from the first, second, third, and fourth distribution runner parts, respectively, and the pressure distribution runner part A mold having a runner and a gate for filling molding resin of a tampon applicator, characterized in that it is provided with a plurality of unit resin injection parts including first and second gate parts. According to claim 1,
A mold having a runner and a gate for filling the molding resin of the tampon applicator, characterized in that the resin injection guiding parts constituting the resin injection guiding part further include a connection runner part for interconnecting and smoothly withdrawing. According to claim 1,
The mold having a runner and a gate for filling the molding resin of the tampon applicator, characterized in that the first and second gate parts have a tapered structure at the end side.

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