JPS5841189B2 - Non-adhesive "bag" for folding ends of ply and its manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for manufacturing pneumatic tires, and in particular to an apparatus for manufacturing pneumatic tires, in particular for folding the ends of the ply of the tire over a bead ring on the mandrel of a tire manufacturing machine to form the main body of the ply. This invention relates to an inflatable rubber air bladder commonly used for pressure application.

However, the invention is not limited to rubber bladders for tire manufacturing.

The tire manufacturing machine described above folds the end of the tire ply wound around the tire manufacturing mandrel upward from the bottom of the bead ring over the bead ring, and is inflatable in order to press it against the main body of the ply. Use a foldable rubber bag.

The rubber plies of a tire are inherently sticky, and it is this stickiness that causes the plies to bond to each other.

Folding bladders, on the other hand, are also typically made of vulcanized rubber, either natural or synthetic, or a mixture of both. Since the ply is naturally viscous,
There is a tendency to stick to the folding bladder, which not only delays the removal of the deflated bladder from the ply, but also erodes the material of the bladder in contact with the ply ends.

Although the following examples describe the application of the invention to ply-folding bags, the invention can also be applied to other articles that contact adhesive rubber substrates.

The purpose of the present invention is that, compared to conventional bladders made of the same material,
It is an object of the present invention to provide a ply-folding bladder or the like that has a reduced tendency to stick to unvulcanized rubber or rubbery polymers, particularly a bladder that is inherently or permanently low in viscosity.

Another object of the invention is to provide a method for manufacturing such a bladder.

The above and other objects, features and advantages of the present invention will become more apparent from the following description taken in conjunction with the accompanying drawings.

Briefly, the rubber device of the present invention is constructed by partially embedding a cord woven fabric layer in at least a portion of the outer surface of the rubber so that the cord protrudes slightly above the outer surface of the rubber. It is characterized by having been configured.

The method of the present invention for manufacturing the bladder comprises calendering a woven cord fabric layer having an uncured and unvulcanized rubber coating on only one side, the woven fabric layer having the rubber coated side of the bladder. Lay them on the base material of the bag so as to contact the base material, heat the superimposed woven fabric layer and the bag base material to cure the rubber coating layer, and the curing operation cures the rubber coating layer. flowing a portion of the rubber between the cords of the woven fabric layer and over the outer surface of the cords, and grinding the outer surface of the cords to remove excess rubber and expose the cords. Consists of.

This grinding removes a portion of the cured rubber between the cords, causing the cords to protrude slightly above the surface of the rubber substrate.

FIG. 1 shows an inflatable rubber bladder 11 for tire braking, which is installed on a tire manufacturing machine.

One side edge of the opening of the bladder 11 is clamped between the mounting ring or clamp 1T and 18, and the other side edge is clamped between the mounting ring 18.
and 19.

The end portion 20 of the tire ply wound around the tire manufacturing mandrel 23 is folded over the bead ring 21 from below and is pressed against the main body 22 of the ply.

Bladder 1 pressed against ply end 20 during ply folding operation
The outer surface of 1 is coated with a woven fabric layer 16 according to the invention.

The woven fabric layer 16 includes fibers 13 perpendicular to the paper plane of FIG. 1 and cords 1 perpendicular to the fibers 13 and parallel to the paper plane.
2 (see also Figures 2-4).

The completed bladder 11 is shown in FIGS. 3 and 4, and the bladder at an intermediate stage of manufacture is shown in FIG.

A woven fabric 16 consisting of a plurality of parallel cords 12 and a plurality of parallel fibers 13 interwoven at right angles to each other is bonded to at least a portion of the outer surface of the rubber stand 11.

The cords 12 are arranged in several groups 14 separated by a spacing 15 greater than the spacing of their individual cords.

The spacing between each fiber 130 is uniform.

As shown in FIG. 3, the outer surface of the rubber substrate of the rubber bladder 11 does not protrude above the cord.

In other words, the cord 12 is partially embedded within the base of the rubber sac 11 and is joined to the base, but protrudes slightly above the top surface of the base and is connected to the fabric of the sac 11. The deposited portion constitutes the fiber contacting surface portion.

These reinforcing cords 12 may be of similar size to reinforcing cords used in pneumatic automobile tires and may be used with similar spacing.

These cords are attached to the annular opening of the bladder 11 and to the mounting ring 1 for attaching the bladder to the tire building machine.
It is wrapped around the outer surface of the sac in a direction extending approximately perpendicular to 7-19.

Therefore, when the end of the tire ply is folded back by the inflated bladder 11, the direction of relative movement between the bladder and the ply will be parallel to the direction of extension of the buried cord 12.

The surface of this cord has much less adhesion to the unvulcanized, uncured rubber material of the tire ply than the bare vulcanized rubber surface of a conventional bladder.

The cord 12 can be made from fibers of cotton or synthetic materials such as polyester, rayon, or nylon commonly used in tire cords.

Alternatively, cords of stretchable or elastic material may be used.

In the case of such stretchable or elastic cords, they may be placed at right angles to the capsular opening and the attachment ring, as in the case of non-stretchable cords, or parallel to the opening and the attachment ring. It may be placed in

The elastic or elastic cord allows the bladder to expand circumferentially.

The method of the present invention for manufacturing the aforementioned bladders and similar articles of manufacture is as follows.

First, a woven fabric layer 16 consisting of cords 12 and fibers 13 is
A covering layer of uncured, unvulcanized rubber is coated on one side and calender molded, and then this woven fabric layer is applied so that its rubber coated surface is in contact with the rubber surface of the bag 11 to form a portion of the rubber surface of the bag. The unvulcanized rubber coating layer is cured by heating the stacked articles, and the heating operation causes a portion of the rubber of the rubber coating layer to form a cord 120 as shown in FIG. The cords and fibers are further flowed between the cords and fibers 130.

The rubber layer is then removed from the surface of the cord 12 by sanding the outer surface of the article formed as shown in FIG. 4, preferably by rubbing the surface of the cord 12 with sandpaper. Rubber bag 1 on the top part
Protrude slightly above the outer surface of 1.

It has been found that when woven fabrics of stretchable or elastic cords are used, there is no need to abrade the outer surfaces of articles made by the method of the present invention.

As used herein, "rubberous polymer" refers to natural rubber, synthetic rubber, or mixtures of both, or other polymers having a rubbery consistency.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of the ply-folding bladder of the present invention, showing the bladder partially deflated and partially retracted from the ply. FIG. 2 is a plan view of a portion of the sac of FIG. 1 with a cord layer applied thereto, FIG. 3 is a sectional view of a portion of the sac of FIG. 2, and FIG. 4 is a view similar to FIG. , before sanding the woven fabric layer to expose the top surface of the cord. 11: rubber sac, 12: cord, 13: woven fabric, 16: woven fabric layer, 20 end of nibry, 21: bead ring, 22 main body of nibly.

Claims (1)

[Scope of Claims] 1. A ply folding bag having at least a portion of its surface as a surface that is less adhesive to an unvulcanized rubbery polymer, the portion being a portion of the outer surface of the rubbery polymer. a woven fabric layer comprising a plurality of spaced apart cords embedded in a woven fabric, the interstices between the cords at the outer surface of the polymer being interposed between the cords; 1. A ply-folding bag characterized in that the cord is free from the polymer surface and that the cord protrudes above the surface of the polymer. 2. The ply folding bag of claim 1, wherein the cord is made of a stretchable material. 3. A ply-folding bladder according to claim 1, wherein the cord is arranged to allow circumferential expansion of the bladder. 4. A ply fold according to claim 3, wherein the cord is made of a non-stretchable material and is arranged on the outer surface of the bladder parallel to the direction of relative movement between the bladder and the braai. Bag for use. 5. A method for manufacturing a rubbery polymer article for a ply-folding bag having a surface with a small surface (partially a surface with low adhesion to an unvulcanized rubbery polymer), comprising: a woven fabric comprising a non-stretchable cord; The layer is calendered with a coating layer of an unvulcanized, uncured rubbery polymer on only one side, and the woven fabric layer is applied to the surface of the article with the polymer coating layer in contact with the surface of the article. and heating the thus stacked articles to cure the coating layer;
The heating operation causes a portion of the polymer of the coating to flow into and over the cords, the outer surface of the coating is polished to remove excess rubbery polymer coating, and the A method of manufacturing a rubbery polymeric article for a ply flap bag comprising exposing the outer surface of a ply flap bag. 6. A method of manufacturing a rubbery polymer article for a ply-folding bag having a surface having a low surface adhesion to an unvulcanized rubbery polymer, comprising: a woven fabric layer consisting of an elastic cord; is coated with a coating layer of an unvulcanized, uncured rubbery polymer on only one side and calender-molded, and the woven fabric layer is applied to the article so that the polymer coating layer is in contact with the surface of the article. the coated article is heated to cure the coating layer, the heating operation causing some of the polymer of the coating layer to flow between the cords; A method of making a rubbery polymeric article for a ply flap bag comprising causing the ply to protrude from the outer surface of the ply.