JPH03151213A - Molding device - Google Patents

Abstract

PURPOSE:To contrive prevention of a statical deformation which is ascribable to a temperature change of a molded product and a reduction of a foreign matter adhering to the surface of the molded product, by a method wherein a clean hot air blow-off device is provided on the upper part of a mold and a taking-out device of the product and those are made fittable respectively with a blow-off air ionizing device. CONSTITUTION:A clean hot air blow-off devide 2 is provided respectively on the upper part of a mold 1 of a molding device and/or the upper part of a taking-out device of a molded product from the mold 1 and a blow-off air ionization device 7 is fitted respectively to clean air blow-off devices 2 each. Intake open air Ao is cleaned by a filter 3, a temperature of which is raised up to almost the same as the mold 1 by a heater 4, dedusted again by a filter 6, after passing through a blower 5, ionized by a static eliminating electrode 7 and static eliminated clean hot air A is blown off downward from the upper part of the mold 1. With this construction, a static deformation ascribable to a temperature change of the molded product is prevented and then a foreign matter to be stuck to the surface of a base is reduced drastically.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to a molding apparatus, and more particularly to a molding apparatus for, for example, synthetic V (polished magneto-optical disk substrate products).

(Prior Art) Molten wood IIi material is injected into a forming Jtq metal rim using one ZLP molding device. For example, the magneto-optical disk made by Bunbakuto Disk (CO) '9 is molded with Jf-shrink 17.
Percentage of foreign matter contamination: If there is even a small amount of foreign matter,
Causes ten defects in playback.

Therefore, in order to clean the molding environment around the molding metal 4 and prevent foreign matter such as dust from adhering to the surface of the molded product disk substrate directly during molding,
A clean air blowing device is installed above the mold in the first space.
For example, in JP-A-60-40, proposals VI and J proposed blowing clean air downward from the upper part of the mold.
It is disclosed in Publication No. 222.

[Solution to be Solved by the Invention: [] However, the occurrence of defects in this type of disk product (d) not only due to the presence of foreign matter such as dust on the surface of the disk substrate, but also due to deformation of the substrate, etc. This can also be caused by a difference in flatness due to the temperature environment inside the molding device, and if there is a temperature difference between both sides of the product substrate due to the temperature environment inside the molding device, static deformation (warpage) becomes the cause.

Furthermore, the occurrence of foreign substances such as NJR dust is not only caused by the atmospheric environment, but also by sliding of the mold, punching of the inner diameter of the board, rubbing against the mold when taking out the molded product from the mold, etc. The molding process itself has the potential to generate foreign matter, and if it adheres to a statically charged substrate, it is extremely difficult to remove it.

In addition, foreign matter Jf in an atmospheric environment such as
/E/ Static deformation due to adhesion or temperature difference on the product board, etc.
This can occur not only in the molded part of the mold, but also when the molded product is taken out of the mold.

However, in the conventional proposed example, the environmental air around the mold section is simply purified, and it is impossible to remove the electrostatically attached foreign matter. The cooling effect causes a change in the mold temperature, which may cause the static deformation of the molded substrate to exceed permissible limits.

The present invention has been made in view of the above-mentioned situations, and its main purpose is to provide a molding apparatus of this type that solves the problems described above in the conventional example.

[,,! Means to solve In]

Therefore, in this invention, at least t)+iif
8. Install a clean hot air blower on the L side of the shore or both sides,
If the configuration is such that clean hot air is blown out at a temperature substantially equal to the mold temperature, then 1+rl γ+'t r
'11 Hot air blowing equipment Q9i is equipped with nine stages of blowing j1 and air ionization r, respectively.
This aims to achieve the following objectives.

(For tables) With the above configuration, static deformation of the molded product due to temperature changes is prevented, and foreign matter 11 attached to the substrate surface is significantly reduced.

〔Example〕

Hereinafter, this invention will be explained based on examples. FIG. 1 is a schematic side view of an embodiment of a molding apparatus according to the present invention, and FIG. 2 is a schematic vertical cross-sectional view of the static elimination clean hot air blowing device.

(Structure) In Fig. 1, 1 is a molding die, a fixed die Ia and a movable die iiJ! Consists of b. 2 is a clean hot air blowing device disposed above the mold 1 according to the present invention, and M is an injection molding machine for supplying molten resin material.

(Operation) The clean hot air blowing device in FIG. 2 shows the country side equipped with the blowing air ionization electrode 7 for static elimination.

3.6 is a filter, 4 is a heater, and 5 is a blower. The taken-in outside air Ao is first purified by the filter 3, and then heated to approximately the same temperature as the mold 1 by the heater 4.

Next, after passing through the blower 5, dust is removed with an SLF filter 6, and the blown air is ionized with a static elimination electrode 7, and the static elimination clean hot air A is sent to the mold! The structure is such that the air is blown downward from the F direction.

(Function) By applying hot blast of ionized clean air to the molded substrate, the temperature on both sides of the substrate is kept substantially the same as the mold temperature, and ions of opposite polarity to the charged object are attracted. It acts to neutralize the charge by adhering to the surface of the charged object. Through this series of operations, static electricity on the surface of the substrate is eliminated, and the amount of foreign matter such as dust attached can be significantly reduced.

(Experimental example) In order to demonstrate the effect of 1- below, a polycarbonate optical disk substrate with a thickness of 1.12 am and a diameter of 5'' was prepared using the prototype device of the above example, and the mold temperature at the time of taking out the molded product; Molding is performed under the condition of blowing clean hot air for static elimination at a temperature of 100℃,
As a result of comparing and verifying the effects of the hot air device and the static eliminator with those without them, results were obtained that demonstrated the effects as shown in Table 1.2.

(Other Act h) 1 Example) In No. 31m (a) and (b), removal of one part of the mold of the first embodiment of Section 1111; addition to the jf clean hot air blowing device 2, and removal from the mold. The schematic configuration of the second embodiment in which another static elimination clean hot air blowing device 2A is arranged in the upper part of the device is shown. 2 is not shown.1. I'm going to do it.

(Structure) In the figure, R represents the opening 4 (as an ejecting device for removing the molded substrate 1 by moving/opening the movable metal layer 1b of the molding die 1).
It has Tsuto, J, F, and Hunt H for holding onto the board. 2A is 6. A second static elimination clean hot air blowing device is installed at 4-1 on the upper part of the second extraction device R, and its 11j is shown in Fig. 4.
A u'i sectional view is shown.

(Movement A1/I1 River) In No. 41A, 3A and 6A are each filter, 4A is a heater, 5A is a blower, 7A is an electrode for deflection, 1111
Each of the waste components 3 to 7 in No. 21m is combined with 7 torito air A. The operation from 1) to blowing out static-eliminating clean hot air is the same as the operation described in the first removing and clean hot air blowing device 2 in FIG. 2 of the first embodiment. It is designed to be sent to the take-out device (robot) R, and the actions on the take-out device R and the take-out zawata molded substrate are exactly the same.

(Experiment example) A mold and ejecting device with the configuration of I- below [a device partially equipped with a dry sludge neutralizing cleansing hot air blowing device was prototyped, and a comparative verification experiment was conducted under the same conditions as in the first example. However, the third.
The results shown in Table 4 were obtained:

4th person Molding directly, 3 μm attached to the substrate surface
Number of debris with φ or less 1-...Same as Table 2 of 111 First Example.

In addition, the number of minute dusts of 1 μmφ or more attached to the mold 1 in the RL portion of the take-out device was 30, demonstrating the effectiveness of each method.

In addition, the dust removal static cleaning hot air blowing device 2 in each of the above embodiments
．． Each filter 3, 6 in 2A: Number of installed filters such as 3A, 6A, heater 4, 4A, blower 5, 5A: Static elimination electric rod 7
, 7A, etc., the relative arrangement, positional relationship, etc. of the 87 components may, of course, be modified in various ways.

〔Effect of the invention〕

As explained above, by installing clean hot air blowing devices on both sides of the molded product, it is possible to prevent changes in the molded product. The static deformation caused by the molding was prevented, and the number of foreign substances that landed on the surface of the molded product was greatly reduced.

[BRIEF DESCRIPTION OF THE DRAWINGS] No. i1A is a side view of the schematic structure of an embodiment of the molding apparatus according to the present invention, FIG. The figures are equivalent to FIGS. 1 and 2 of Chiwazowa's other embodiments. 1...Molding mold 2.2A...(Static elimination) Cleaning hot air blowing device 7.7
A: Static elimination electric rod (one-stage ionization of blown air) A: (Static neutralization) clean hot air R: Extraction device (robot)

Claims (4)

[Claims] (1) A molding device characterized in that a clean hot air blowing device is provided above the molding die of the molding device. (2) The molding apparatus according to claim 1, wherein the clean hot air blowing device is equipped with blowing air ionization means. (3) A molding device characterized in that a clean hot air blowing device is provided above a molding die of the molding device and/or above a device for taking out a molded product from the mold. (4) The molding apparatus according to claim 3, wherein each of the clean hot air blowing devices is provided with blowing air ionization means.