JPS63109021A - Method and apparatus for immersion molding - Google Patents

Abstract

PURPOSE:To attempt to make a product uniform, by setting a mold on a conveyer being movable along a freely-rotatable immersion bath, immersing the mold in a part of the rotating immersion bath and taking out the mold. CONSTITUTION:A freely-rotatable ring-shaped immersion bath 30 and a conveyer 20 on which a mold 10 being movable along this immersion bath 30 are provided. The mold 10 moving along the conveyer 20 is immersed in a solution 31 in a part of the rotating immersion bath 30 is taken out thereof after the immersion is done by a required distance. If the immersion bath 30 is rotated like this, the solution 31 is also rotated in the same speed as that of the immersion bath 30 against the static floor face 41 because the solution 31 is viscous and the flow has a constant speed at every position on a cross-section perpendicular to the rotating direction of the immersion bath 30. The components in the solution are thereby homogeneous. It is thereby possible to make the components and the thickness of a product to be uniform.

Description

Detailed Description of the Invention [Industrial Field of Application] The present invention relates to a dip molding method and an apparatus thereof, and more specifically, to a method in which a production mold is immersed in a solution to adhere the solution to the peripheral surface of the mold, and then dried. This article relates to an efficient dip molding method for immersing a production mold in a solution to make the solution adhere to a manufacturing device that obtains a product by peeling it off from a production mold, and an immersion manufacturing device that can be used directly in that molding method. Yes, especially suitable for manufacturing vinyl gloves when using sol-form vinyl chloride paste as a solution, or rubber gloves, condoms, ice packs, rubber bags for blood pressure monitors, etc. when using rubber latex solutions. This invention relates to an immersion molding method and its apparatus.

[Prior Art] Conventionally, many products have been manufactured using the dip molding method.

As shown in factor 7, the production of products by this dip molding method involves the steps of immersing the production mold in a solution, drying the solution that adheres to the production mold as a result of being immersed in the solution, and drying the solution that adheres to the production mold. It was formed from a peeling process of the formed film-like product.

In such conventional manufacturing, the dipping step was performed as shown in FIG.

That is, the manufacturing mold 10 attached to the conveyor 20.

It was designed to be immersed in a dipping tank 30 containing a solution 31, moved through the solution 31, and taken out from the solution 31 after moving a predetermined distance.

However, according to such conventional dip molding equipment,
There were the following problems.

■Since the production mold 10 moves approximately in the center of the immersion tank 30, the solution 3
The characteristics of 1 were to change.

This means that if the solution 31 is a vinyl chloride paste, the viscosity and yield value will change;
When rubber latex is used, non-uniform dispersion of additives is caused.

■When starting to use the solution 31, the solution 31 must be stirred in order to remove the film on the surface of the solution 31 and to make the solution 31 homogeneous, but the dipping operation must be stopped during this stirring. Moreover, it could not be used until the air bubbles generated by stirring disappeared.

■When replenishing the solution 31 or when replenishing to adjust the viscosity, additives, etc., the viscosity, yield value, additive dispersion, etc. may differ between the parts of the immersion tank 30 near the replenishment part and the part of the immersion tank 30 far away. This results in unevenness.

In order to prevent such non-uniformity, it is sufficient to stir the solution 31 inside the immersion tank 30, but if the solution is stirred, the solution cannot be used until the generated air bubbles disappear, resulting in a long loss time. Ta.

Even when stirring is not performed, it is possible to make the solution 31 uniform by moving the supply port for the solution 31 over the entire area of the immersion tank 30, but the surface of the solution 31 will be roughened. It wasn't a good thing.

■Removal of dust etc. mixed into the solution 31 not only has to be carried out after stopping the dipping operation, but also after removing the dust etc., the dipping work must be stopped until the air bubbles mixed into the solution 31 are gone. It was something that had to be done.

(2) Although the speed of the conveyor 20 is determined by the dipping time, if the speed is too high, the resistance between the production mold 10 and the solution 31 increases, making it impossible to achieve uniform film thickness.

Next, among the problems of conventional devices, the main problem is
In order to solve the non-uniformity of 1, an immersion device as shown in FIG. 9 was provided.

This immersion device is equipped with a circulation system 2132 near the bottom of the immersion device shown in FIG.
By circulating the solution 31, the viscosity of the solution 31 or the dispersion of the additives is made uniform and film formation on the surface is prevented.

[Problems to be Solved by the Invention] When the immersion device shown in FIG. 9 is used, the immersion 463
The uniformity of the solution 31 inside the solution 31 can be guaranteed to some extent, and since stirring is performed automatically, there is no generation of bubbles, and the solution 31? The uniformity of the solution 31 during I feeding was also quickly achieved.

However, with this immersion device, not only does the entire device become large, especially long.

To apply a constant velocity flow to the viscous solution 31,
There is a difference in the flow rate of the solution 31 between the central part of the immersion tank 30 and the vicinity of the wall surface, which may cause mismatches in components and wall thicknesses of the produced products between the central part in the moving direction of the manufacturing mold 10 and both sides in the moving direction. was to occur. Furthermore, since the solution 31 itself has a considerable viscosity, it is extremely difficult to control the flow rate of the solution 31, and it is also difficult to respond to changes in viscosity caused by use.

[Means for Solving the Problems] Therefore, in order to solve the above-mentioned problems, the present invention forms an immersion tank in an annular shape, rotates the entire immersion tank at a constant angular velocity, and rotates the entire immersion tank at a constant angular velocity. By attaching a production mold to a conveyor placed along the conveyor and forming the conveyor itself so that it can move and perform the dipping operation, the solution can be By trying to make the product uniform in the same manner as when circulating at a constant speed, and by controlling the angular velocity of one revolution, it is possible to reliably control the apparent flow velocity. The object of the present invention is to provide a dip molding method and a dip molding device.

In order to achieve the above object, the present invention provides a rotatable dipping tank, provides a production mold on a conveyor that can move along the dipping tank, and rotates the manufacturing mold that moves along the conveyor. A dip molding method is characterized in that a part of a dipping tank is immersed in a solution, immersed for a predetermined distance, and then taken out.
A conveyor movable along the rotational direction of the dipping tank is arranged, a manufacturing mold is provided on this conveyor, and the manufacturing mold fixed to the conveyor can be dipped into and taken out of the solution of the manufacturing mold in the dipping tank. The gist thereof is an immersion molding apparatus characterized in that it is formed so as to be movable in the vertical direction.

[Example] Examples of the present invention will be described below in accordance with the explanation of the dip molding apparatus shown in FIGS. 1 to 6.

FIG. 1 is a plan view of the dip molding apparatus, FIG. 2 is a sectional view taken along the line A-A in FIG. 1, FIG. 3 is a sectional view showing the stirring plate 33, and FIG. A cross-sectional view, and FIG. 5 is a plan view showing the partition plate 35.

FIG. 6 is a sectional view of the same. - In FIGS. 1 and 2, the dip molding apparatus according to the present invention has an annular dip bath 30 fixed on a turntable 40 rotatably fixed on a floor surface 41, and
A conveyor 20 that is movable along this annular dipping tank 30
The establishment is being formed.

The dipping tank 30 contains a sol-like vinyl chloride paste or rubber latex solution 31. This solution 3
1, for example, when manufacturing vinyl gloves, vinyl chloride paste is used, and when manufacturing rubber gloves, condoms, ice packs, rubber bags for blood pressure monitors, etc., rubber latex type products are used. .

Further, in the illustrated example, a liquid temperature adjustment tank 37 containing hot water or the like as a heat insulating liquid 36 is fixed on the turntable 40 so as to sandwich the immersion tank 30 therebetween. This liquid temperature adjustment tank 3
7 is for maintaining the temperature of the solution 31 in the immersion tank 30 at a set temperature by conductive heat from the outer wall of the immersion tank 30.

Although not shown in the drawings, this liquid temperature adjustment tank 37 keeps the temperature of the solution 31 constant by keeping the temperature of the internal heat-retaining liquid 36 constant using heating means such as a heater or hot water circulation means. It is something.

Furthermore, this dipping tank 30 has a starting part 50 where the production mold 10 starts dipping, and a take-out part 60 where the dipping ends.

Also, the immersion tank 3 between the starting part 50 and the take-out part 60
0, a filter screen 34 for removing dust and the like from the solution 31 and a stirring plate 33 for stirring the solution 31 are positioned sequentially from the take-out part 60 side. The filter screen 34 has a width that matches the inner dimensions of the crab soaking tank 30, and is fixed to the floor surface 41 by means not shown. The stirring plate 33 is also fixed to the floor surface 41 by means not shown.

Therefore, even if the immersion tank 30 is rotated by rotating the turntable 40, the filter screen 34 and the stirring plate 33 do not rotate, so that the dirt in the solution 31 gets caught on the filter screen 34 and passes through the filter screen 34. The solution 31 is stirred on a stirring plate 33.
It will be stirred by.

Furthermore, a replenishment port 38 for the solution 31 is provided between the filter screen 34 and the stirring plate 33. This supply port 38 is connected to the solution 31
When the amount decreases below a predetermined amount, the solution 31 is added to the inside of the dipping tank 30.
This is later to replenish.

The manufacturing mold 10 is fixed to the conveyor 20 via a plurality of support rods 21 protruding at a constant pitch.

Further, the conveyor 20 is configured to take out the manufacturing mold 10 from a position corresponding to the starting part 50 so that the manufacturing mold 10 fixed to the conveyor 20 can be immersed in the solution 31 from the starting part 50 of the VI immersion tank 30 and taken out from the taking out part 60. Between the positions corresponding to the portions 60, the manufacturing mold 10 is formed to descend. Specifically, the trajectory of the conveyor 20 can be lowered as shown in the example shown in Figure 1.
The support rod 21 can also be formed so as to be bent so that 0 is lowered.

In addition, this conveyor 20 has a roller 2 provided on a support rod 21 in front of a starting part 50 where immersion into the immersion tank 30 is started.
2 rotates on the front track 23, and the production mold 10 also rotates at the same time.

Further, a take-out section 60 after immersion in the immersion tank 30 is completed.
After that, a roller 22 provided on the support rod 21 moves the rear track 2.
4 and rotates, and the manufacturing mold 10 is also rotated at the same time. It should be noted that the solution 31 is attached as an adhesion film 7o to the production mold 1O that comes out from the take-out part 6o after the immersion is completed in this way.

Although not shown, the subsequent track 24 continues to a drying process and a product peeling process.

Next, the dip molding method according to the present invention will be explained along with the use of the dip molding apparatus described above.

First, a solution 31 of predetermined components is put into the immersion ffl tank 30, and the temperature of the liquid temperature adjustment tank 37 is adjusted so that the temperature of the solution 31 in the immersion tank 30 becomes a predetermined temperature.

Next, or before putting the solution 31 into the dipping tank 30, a manufacturing mold l having a predetermined shape is attached to the tip of the support rod 21 of the conveyor 20.
Fix O.

Thereafter, the turntable 40 is rotated at a predetermined speed, and the conveyor 20 is also moved at a predetermined speed. Both speeds are 1. It is preferable that the conveyor at 20 speed is slightly faster, but compared to the same speed or conversely, the turntable at 40 speed.
There is no problem even if the conveyor 20 speed is made slightly slower.

Then, the manufacturing mold 10 fixed to the conveyor 20 via the support rod 21 descends near the starting part 50 and is immersed in the solution 31 in the dipping tank 30, and rises at the take-out part 60 to drain the solution 31 in the dipping tank 30. The solution 31 is deposited around the tA molding 10 in the form of a 61 film-like adhesive film 70. Furthermore, at this time, if the manufacturing type IO is a glove as shown in the illustrated example, it is desirable to move it through the solution 31 tank with the palm side facing forward.

5 in this way! Adhesive film 7 attached around the mold 10
0 is a product that has undergone a drying process and a peeling process.

Note that even when dirt 5 is mixed into the solution 31, it can be continuously removed by the filter screen 34.

Furthermore, by adding the stirring plate 33, the concentration distribution of the solution 31, which changes slightly due to the solution 31 adhering to the production mold 10, can be continuously returned to a uniform one.

Furthermore, by positioning the replenishment port 38 for the solution 31 between the filter screen 34 and the stirring plate 33, it is possible not only to replenish the solution 31 while continuing the dipping operation, but also to make the concentration of the solution 31 uniform. can.

In this way, the rotatable dipping tank 30 formed in an annular shape,
The manufacturing mold 1 is movable along this dipping tank 30 and
0 is fixed on a conveyor 20, and the production mold 10 that moves along the conveyor 20 is rotated.
If a dip molding method is used in which a part of the tube 630 is immersed in the solution 31, immersed for a predetermined distance, and then taken out, the dipping tank 30 itself will always be rotating during the dipping operation.

When the immersion tank 30 is rotated in this way, since the solution 31 has viscosity, the solution 31 is rotating at the same speed as the immersion tank 30 relative to the restrained floor surface 41, and the solution 31 remains stationary. The solution 31 in the immersion tank 30
If it is flowing, it will be a simple. Further, since the flow has a constant speed at any position when a cross section is taken perpendicular to the rotational direction of the dipping tank 30, the components of the solution 31 are also uniform. Therefore, by using the invasive molding method according to the present invention, the composition and thickness of the product can be made uniform.

Furthermore, simply by changing the rotation speed of the dipping tank 30, the rotation speed with respect to the floor surface 41 described above can be freely changed, so that a product with a predetermined thickness can be obtained depending on the shape of the solution 31 or the manufacturing mold 10. Can be done.

Furthermore, by using the dip molding apparatus according to the present invention, the product can be made uniform, and the thickness of the adhered film 70 can be set by simply controlling the rotation speed of the dip tank 30 and the moving speed of the conveyor 20, so that the desired thickness can be obtained. How thick can you get the product?

Furthermore, since the dipping tank 30 is formed in an annular shape, the entire device can be made compact.

Note that a filter screen 34 is placed in the dipping tank 30.

Even when dirt or the like gets mixed into the solution 31.

It is convenient because it is possible to continuously remove dust while performing the immersion work.

Furthermore, when a stirring plate 33 is attached to the immersion tank 30, the solution 31 changes slightly depending on the solution 31 attached to the production mold IO.
This is convenient because the concentration distribution can be returned to a uniform one continuously.

Furthermore, if the replenishment port 38 for the solution 31 is located between the filter screen 34 and the stirring plate 33, it is not only convenient because the solution 31 can be replenished while continuing the dipping operation, but also a single replenishment port 38 is provided.
However, since the immersion tank 30 is rotating, the solution 31 can be made uniform while being replenished.

In the illustrated example, the manufacturing mold 10 is shown as a glove-like model, but the shape is not limited to this.

Further, as shown in FIGS. 5 and 6, if a partition plate 35 is provided near the liquid surface of the solution 31, the uniformity of the solution 31 will be further improved, and in particular, a liquid film formed on the surface of the solution 31 will be removed. can.

[Effects of the Invention] As explained above, the present invention not only makes it possible to make the components and thickness of the product uniform, but also makes it easy to achieve the desired thickness, and also allows the product to be compact as a whole. It is something.

[Brief explanation of the drawing]

The drawings show an embodiment of the device according to the present invention, in which FIG. 1 is a plan view, FIG. 2 is a sectional view taken along line A-A in FIG. 1, and FIG.
Figure 3 is a sectional view showing the stirring plate, Figure 4 is a sectional view showing the mesh, Figure 5 is a plan view showing the partition plate, Figure 6 is the same sectional view, and Figure 7 is the cross-sectional view of the product. A block diagram showing the manufacturing process, and FIGS. 8 and 9 are schematic diagrams showing different conventional examples.

Claims (1)

[Claims] 1. A rotatable dipping tank is provided, a production mold is provided on a conveyor that can move along the dipping tank, and the manufacturing mold that moves along the conveyor is connected to the rotating dipping tank. A dip molding method characterized by immersing a portion of the liquid in a solution and removing it after being immersed for a predetermined distance. 2. A dipping tank formed in an annular shape is rotatably formed, a conveyor movable along the rotational direction of the dipping tank is arranged, a manufacturing mold is provided on this conveyor, and the manufacturing mold fixed to the conveyor is used for manufacturing. An immersion molding apparatus characterized in that the immersion molding apparatus is formed to be movable in the vertical direction so that the immersion tank of the mold can be immersed in and taken out from the solution. 3. The dip molding apparatus according to claim 2, wherein the dip bath is fixed on a rotatable turntable.