JPH03251411A - Manufacture of weatherstrip - Google Patents

Abstract

PURPOSE:To prevent a fin part from being crushed by prevulcanizing the fin part immediately after being extruded from an extruder. CONSTITUTION:The outer peripheral surface of a prevulcanizing device 2 is formed with an annular groove 11a for setting the fin part (b) of a raw material P free and an annular protrusion 11b that contacts with the inner peripheral surface of a recession (c) in the side of the fin part (b). On the position of the side of an extruder 1 within the prevulcanizing device 2, a near infrared ray heating device 12 is disposed as prevulcanizing means at two places under the position between rollers 11. For the prevulcanizing of this type, heating is effected by microwaves or the supply of hot air. On the side of a transporting direction of the raw material P in the near infrared heating device 12 of the prevulcanizing device 2, a hot air heating device 13 is disposed that supplies hot air to the raw material P. By the prevulcanizing device 2, the fin part (b) of the raw material P has a certain degree of a form supportability. Even the fin part (b) is disposed at a lower position and transported therefrom, the fin part (b) is prevented from being prevulcanized in a crushed manner.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a method of manufacturing a weatherstrip in which a fin portion is formed on the back side of the designed surface.

<Prior art> Conventionally, in the production of weather strips, after being extruded from an extruder, the weather strips are manufactured through a vulcanization process, a cooling process, and a cutting process in order (Japanese Patent Laid-Open No. 55-144140, (Refer to Japanese Patent Publication No. 184029/1983).

For weatherstrips in which fins are formed on the back side of the designed surface, when being extruded from an extruder, care is taken to prevent the designed surface from coming into contact with conveying devices such as rollers or conveyors during transportation and degrading its appearance. The designed surface is placed on the upper surface side that does not come into contact with the conveyance device, and the article is conveyed.

In other words, with weatherstrips in which the fins are formed on the back side of the design surface, unless some measure is taken, the fins will be placed on the bottom side and come into contact with the conveyance device, and the fins will not be vulcanized. It was crushed by the weight of the weather strip during transportation, and was vulcanized in that state.

For this reason, waste materials that come into contact with the conveying device are formed in advance around the fins, and the waste materials prevent the fins from being crushed.

However, if you form waste material around the fin like this,
It is necessary to take the time and effort to cut out the waste material after vulcanization, and the material for the waste material is also required, resulting in a poor material yield.

This invention solves the above-mentioned problem, and when manufacturing a weather strip in which the fins are formed on the back side of the design surface, it is possible to prevent the fins from collapsing without forming waste material. It is an object of the present invention to provide a weather strip manufacturing method that can improve the material yield and eliminate the irregular labor of cutting off waste material after manufacturing.

<Means for Solving the Problems> In the method for manufacturing a weatherstrip according to the present invention, the weatherstrip is extruded from an extruder with the fin portion disposed downward, and then sequentially undergoes a vulcanization process, a cooling process, and a cutting process. A method for manufacturing a weatherstrip manufactured through the above steps, characterized in that the fin portion is pre-vulcanized immediately after being extruded from the extruder.

<Operations and Effects of the Invention> In the method for manufacturing a weatherstrip according to the present invention, the fin portion is pre-vulcanized (semi-vulcanized in advance) immediately after being extruded from the extruder, so that the fin portion is partially cured. shape retention is ensured, and even if the fin is subsequently transported with the fin disposed downward, the fin is prevented from being crushed.

Therefore, in the weatherstrip manufacturing method according to the present invention, it is not necessary to form waste materials, and the yield of materials can be improved, and unnecessary labor such as cutting off waste materials after manufacturing can be eliminated. .

<Example> Hereinafter, one embodiment of the present invention will be described based on the drawings.

As shown in FIG. 3, the weatherstrip W manufactured in this example is a material P extruded from an extruder 1, whose fins are prevulcanized by a prevulcanization device 2, and then subjected to microwave vulcanization. Vulcanization is performed by the main vulcanization device 3, which consists of a device 4 and a hot air heating furnace 5 for post-vulcanization, and then cooled through a cooling tank 6, and then cut into predetermined lengths by a cutter 7, and manufactured. has been done. In addition, extruder 1, main vulcanizer W3
, the cooling N6, and the cutting machine 7 are each known devices.

As shown in FIGS. 1 and 2, this pre-vulcanization device 2 is equipped with a large number of conveyance rollers 11 for conveying the material P, and each of these rollers 11 utilizes a stopper 22 with respect to a drive shaft 21. Each drive shaft 2 is configured to be rotationally driven via a chain (not shown).

The outer peripheral surface of each roller 11 is formed with an annular groove 11a through which the fin of the material P escapes, and an annular projection 11b which abuts on the inner peripheral surface of the recess C on the side of the fin. In addition, material P
will be transported with the upper surface side as design surface a.

A near-infrared heating device 12 as a pre-vulcanization means is disposed at a position on the extruder 1 side in the pre-vulcanization device 2, 2 m below between the rollers 11. Note that 12a is a near-infrared radiator, and 12b is a reflector.

For this pre-vulcanization, heating may be performed by microwave heating or by supplying heat ffl, but it is desirable to use near-infrared heating with the shortest heating time.

In addition, the material P of the near-infrared heating device 12 of the pre-vulcanization device 2
A hot air heating device 13 that supplies hot air to the material P is arranged on the conveying direction side. This hot air heating device 13 consists of a blower 13a and a duct 13C extending from the blower 13a via a heater 13b.
It is arranged below between each conveying roller 11.

This hot air heating device 13 is arranged to easily vulcanize the inner circumferential surface side of the recess C in the fin, and to ensure vulcanization time when pre-vulcanizing the fin. Due to the balance with the conveyance time of the material P, the faster the conveyance speed of the material P is, the longer the time required. Conversely, if the conveyance speed of the material P is slow, the near-infrared heating device 12 or the hot air heating device 13
Only one of these devices may be used as the pre-vulcanization device 2.

Note that this hot air heating device 13 is designed to prevent the material P from coming off the conveyance rollers 11 and to prevent the wind speed from the blower 13a from becoming too high.

Then, by this pre-vulcanization device 2, the fin portion of the material P is semi-vulcanized so that it has a certain degree of shape retention and is not over-vulcanized by the subsequent main vulcanization device 3. That will happen.

Therefore, when manufacturing the weatherstrip W by sequentially using each of the apparatuses 1 to 7 of the embodiment, the material P extruded from the extruder 1 is transferred to the preliminary vulcanization apparatus 2 immediately after being extruded. Since the fins are pre-vulcanized to have shape retention properties, even if the fins are placed downward and transported, the fins can be prevented from being vulcanized in a collapsed state. , the same effects as those described in the section of the functions and effects of the invention described above are achieved.

In addition, in the embodiment, since the periphery of the fin, which is the part that comes into contact with the conveying roller 11, is also prevulcanized in the prevulcanization device 2, the material is The amount of vulcanization gas generated from the lower surface side of P can be reduced. Therefore, it is possible to reduce the contamination caused by the vulcanizing gas on the rollers and conveyors used to convey the material P in the vulcanization apparatus 3, and to reduce the effort and man-hours required to clean the conveyance devices such as the rollers and conveyors used for conveying the material P. can be reduced.

In addition, although fixed window frame rubber was illustrated as the weather strip W in the embodiment, the present invention may be applied to the manufacture of other weather strips such as glass runs.

[Brief explanation of drawings]

FIG. 1 is a schematic sectional view of a prevulcanization device used in an embodiment of the present invention, FIG. 2 is a schematic sectional view of the II-11 section in FIG.
The figure shows the production line of the same example. 1... Extruder, 2... Pre-vulcanization device, W... Weatherstrip, a... Design surface, b... Fin portion.

Claims (1)

[Scope of Claims] A method for manufacturing a weatherstrip, which is manufactured by extruding the weatherstrip from an extruder with the fins disposed downward, and then sequentially passing through a vulcanization process, a cooling process, and a cutting process, the method comprising the steps of: A method for manufacturing a weather strip, characterized in that the fin portion is pre-vulcanized immediately after being extruded from a machine.