KR830000591B1 - Continuous molding method of fastener assembly - Google Patents

Abstract

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Description

Continuous molding method of fastener assembly

1 is a plan view of one embodiment of a fastener assembly according to the present invention.

FIG. 2 is a rear view of the FIG. 1 fastener assembly. FIG.

3 is a side view of the first degree fastener assembly.

4 is a cross-sectional view of the first degree fastener assembly.

4A is an enlarged view of a portion of FIG. 4.

FIG. 5 is a partial perspective view of the fastener assembly of FIG. 1 showing one end bar and its associated connector. FIG.

FIG. 6 is a perspective view of a portion of the other end of the FIG. 1 fastener assembly. FIG.

7 is a plan view of a second embodiment of a fastener assembly according to the present invention;

8 is a side view of the FIG. 7 embodiment.

8A is an enlarged view of one end of FIG. 8;

9 is a plan view of a third embodiment of a fastener assembly.

10 is a schematic view of a continuous forming apparatus.

11 is a cross-sectional view taken along line 11-11 of FIG. 10 showing a forming apparatus for the manufacture of the FIG. 1 embodiment.

12 is a cross-sectional view taken along lines 11-11 of FIG. 10 showing a forming apparatus for the manufacture of the FIG. 7 embodiment.

The present invention relates to a process for continuous molding of novel fastener assemblies.

Recently, a very successful business has been developed using flexible plastic fasteners of the type designed to be inserted through the intestinal needle of the pupil to tag or couple the two articles together.

However, fasteners have been widely used in devices for applying them, in buttoning clothing, attaching price tags, mating items such as shoes, and in a variety of industrial applications.

Such fasteners and devices are described in United States Patent Nos. 3, 103, 666, 3, 399, 432, 3, 380, 122, 3, 444, 597, 3, 457, 589, 3, 470, 834, 3, 659, 759, 3, 733, 657, 3, 759, 435, 3, 875, 648, 3, 893, 612, 3, 895, It is shown in many documents, including 753, 3, 948, 128.

Most commonly plastic fasteners have been in the form of assemblies for continuous feeding through a dispensing device.

They are attached by runner bars by a cutable neck, for example as indicated in US Pat. Nos. 3, 103, 666, or described, for example, in US Pat. Nos. 3, 875, 648. As a collection of continuous side members cross-linked by a plurality of filaments, they are supplied as aggregates cut by them.

The fastener assembly using the travel bar provides the number of fasteners that can normally be supplied as one assembly so that the travel bar is not attached to the product and only material is consumed.

These limitations were limited in part by the fasteners described in US Pat. No. 3,875,648, but a price tag where each single fastener end bar was distributed by hand tools and angles required improvements in supplying and distributing fasteners to the application. .

It is a primary object of the present invention to provide a method for continuously forming an improved fastener suitable for use in an improved method and apparatus for feeding, separating and dispensing.

Fastener assemblies manufactured by conventional methods, as described in US Pat. No. 3, 875, 648, consist of two long continuous plastic side members intersected by a plurality of filaments or cross connectors, each of which is fastener assembly. The fastener is assigned to be supplied as a unit to a separate position in the machine, at least one side member comprising an end bar where each separate fastener is formed from a portion of the side member and having a long groove for the passage of the associated filaments It is assigned to be in the shape of supplying through the hole of the pupil needle.

Each filament may overlap toward the associated end bar for feeding through the pupil. As shown, the filaments and end bars are preferably circular in cross section.

According to the method of the present invention, the cross section is deformed as one side of each filament becomes a flat surface corresponding to the branch line of the mold in which it is molded.

The filament cross section is actually D-shaped and provides traction to the surface extending from the plane to facilitate removal from the mold.

The side members provide a cuttable connector to reduce the cross-sectional area between the individual fasteners to facilitate cutting. The connector extends from the same side at a portion of their outer periphery with a flat side or at the same side as the filament or at the opposite side thereof, preferably from the same side and the connected end bar is actually D-shaped.

As the connector extends from the mating side, its cross section preferably provides a more rounded cross section for feeding through the circular needle hole while continuing to cross the connected end bar.

It can be stretched after forming to reduce the filament size and increase its strength. The filaments so allocated are applied to continuous casting at an endless length and are well adapted to feeding, cutting and dispensing by the method described below and by the apparatus of 1982 patent application 2646.

The fastener assembly manufactured by the method of the present invention is as follows.

1-6 show one embodiment of a fastener made by the method of the present invention having a plurality of cross connectors or long and continuous side members 50 and 51 cross-linked by filaments 52.

The side member 50 comprises a plurality of tab or paddle end members 53 connected to each other by a cutable connector 54, one surface of the tab 53 for inserting a decoration ( 55, optionally embossed.

The side member 51 has a plurality of end bars 56 connected to each other by a cuttable connector 57.

As shown by way of example in FIG. 5, the filament 52 has an approximate cross section having a maximum width at the flat surface 58 of one side.

The remainder of its cross section decreases in width from plane 58 to the other side and can be any suitable shape and is a convergence curve, a straight line, or a combination thereof.

As shown in FIG. 4A, the end bar 56 has a larger cross section than the filament 52 and preferably has the widest parallel cross-sectional dimension 60 of the plane 58.

As shown in FIG. 6, the tab end 53 is also flat and has a maximum cross-sectional dimension in the plane 58.

In the embodiment in FIGS. 1-6, tab connector 54 and end bar connector 57 have one side in plane 58 and are thinner than filament 58, cross 56, or tab 53. It extends from the surface 58 on the side opposite to the body of the filament 52.

These connectors also extend continuously between adjacent tabs 53 and adjacent end bars 56 as well as transversely connecting end bars 56 and tabs 53. Such an extension provides a more rounded end bar 56 (see also FIG. 4A) and may be molded into a continuous running member as described later.

As shown in FIGS. 1, 2, and 7, the filament 52 is shaped a rather wider, larger circumferential dimension adjacent to the tab 53 than at the end bar 56 so that the filament folds upon dispensing through the needle. It is easy to stretch adjacent to.

A second embodiment of the fastener according to the method of the invention is shown in FIGS. 7, 8 and 8, wherein the cutable connectors 54a and 57b extend from the plane 58 in the same direction as the body of the filament 52. Same as the fastener shown in FIGS. 1-6 except that it does not extend significantly across the end bar 56a or tab 53a.

This embodiment is most preferred.

A third embodiment of the fastener assembly is shown in FIG. 9 where two side members 51a are used to provide end bars at both ends of the filament 52.

In this embodiment, the filament 52a is the middle portion thereof. The circumferential dimension is somewhat folded or small adjacent to each end bar to facilitate extension and reinforcement of the filament 52 at the parts that are widely cast and overlap upon dispensing.

All other features are identical to those of FIG. 9 and FIG. 7.

Each of the foregoing embodiments of the fastener is adapted to continuously form and dispense the fastener as described below in the present invention.

Continuous molding of plastic parts is known and US Pat. Nos. 3, 085, 292, 3, 196, 196, 3, 515, 778 and many patents thereof are described and the method of the present invention is 10-12. It is shown in the figure.

The heated plastic is extruded from the extruder 70 through the orifice of the platen 71 into the outer cavities of the rotating forming wheel 72.

After cooling, the continuous forming portion is removed from the forming wheel 72 by the take out roller 73 and the feed rollers 74 and 75 and stretched by any suitable device 76 and the material 77 rolled up. It is wound up at (78).

Elongation can be approximated or implemented separately.

As shown in FIG. 11, the cavities 52 ', 56', 53 'are provided on the outer circumference of the forming wheel 72 for the filament 52, the end bar 56, and the tab 53. As shown in FIG.

The connectors 54 and 57 are provided in the continuous running cavities 54 'and 57' of the printing portion 71.

The tab 53 may have a thickness equal to or different from the thickness of the filament 52 when desired.

As shown in FIG. 12, the connectors 54a and 57a may be provided by grooves 54a 'and 57a' of the outer circumference of the forming wheel 72a between the fastener cavities. Comparing FIGS. 10-12 and 1-9, it can be seen that the plane 58 is formed by the surface where the printing portion 71 and the forming wheel 72 meet.

The aforementioned dimensions are referenced to the fastener assembly when the fastener is molded.

When the filament is stretched, the edges of the flat plane 58 may be somewhat rounded to stretch, but the filament retains its one end cross-sectional shape.

End bar 56 and tab 53 are generally not elongated. Slight torsion from shrinkage and cooling can be seen.

The fastener assembly produced in this way can be supplied and dispensed as a dispensing device of 1982 patent application 2646.

As described above, according to the present invention, it is economical by continuously casting the fastener to an endless length, and there is an effect that the production speed is high.

Claims (1)

Pressurized heated polymer material from extruder 70 into printing section 71, a series of longitudinally extending connected paddle members, a series of longitudinally extending end bars and a series of connecting paddle members to end bars. Moving the mold relative to the printing portion to receive the heated aggregate material in a series of cavities forming cross connectors of the joint fastener assembly.

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