JPH01195019A - Accordion type curtain, its manufacture and scatter preventing device in projecting and releasing molded object from mold in molding machine using said curtain - Google Patents

Abstract

PURPOSE:To enable a curtain body to be surely received without contamination or defect by a method in which crest folding part and root folding part are alternately formed with set width on the synthetic resin curtain body with rigidity, and plait parts are closely folded and lapped by applying pressure and heat to folding lines. CONSTITUTION:The notched part 12 of length p is provided on the film with suitable rigidity and flexibility along the crest folding line 13' of crest folding part and the root folding line 14 of root folding part positioned in set width w and in spaced relation by a prescribed distance p' with both end parts remaining. An accordion type curtain body 11 is formed by a alternately forming, folding back, pressing and folding back closely under high temperature. The curtain body 11 is arranged so that on the operation side and the opposite side of molds 91, 92, the lower part of the curtain is positioned inside of the tie bars 83, 84 of lower stage, and its upper part is arranged outside of the tie bars 83, 84 of the same lower stage with a prescribed inclined angle. When a molded object is released from a movable mold 92, the molded object reaches a prescribed discharging part 16, while scattering is prevented.

Description

[Detailed description of the invention] [Industrial application field] The present invention uses a strong and rigid synthetic resin film,
When folding, the folds between the mountain fold and the valley fold can be closely overlapped, and when folded into the mountain and valley multiple times, the positions of the multiple folds can be formed without shifting, and the settings can be adjusted. An accordion-type curtain that can be folded accurately with a uniform width is obtained, and the accordion-type curtain is used in a molding machine, particularly in an injection molding machine, to prevent scattering when a molded product is ejected and released from the mold. .

In other words, when the mold of a molding machine is closed, the curtain is folded into small ridges and valleys, and when the mold is opened, it elastically stretches against the rigidity of the curtain, especially when multiple Ensuring that molded products produced in large quantities using single-cavity molds or, in some cases, single-cavity molds, are safely placed in designated containers without soiling or damage after injection molding and release from the mold. The purpose is to make it possible.

[Prior Art] It is generally known that accordion-style curtains are made of cloth or synthetic resin sheets and folded alternately with mountain and valley folds, and are also used for indoor partitions and window shading. etc. is used.

On the other hand, there has been provided a method in which the above-mentioned curtain is formed into a small size, folded in an accordion style, and applied to a molding machine. For example, as proposed in Japanese Utility Model Application Publication No. 58-194011, an accordion-folded sheet is placed on opposing surfaces below the mold of a plastic molding machine, and a flat sheet material is placed on the other opposing surfaces. Each part of each corner is joined to form a skirt, and the upper part of the skirt is attached to the bottom of the mold and suspended, and serves as a guide when the molded product that has been molded and released falls downward from the mold. has been achieved.

(Problem to be Solved by the Invention) However, in the conventional accordion-type curtains, apart from those made of cloth, those made of synthetic resin sheets are thick because they contain reinforcing aggregate for shape retention. Although it is suitable for indoor partitions, etc., it is not suitable for application to machines such as molding machines.

Therefore, by using a rigid synthetic resin film and creating creases that alternately repeat mountain folds and valley folds, □
Accordion-style curtains can be made, but if the film is rigid, no matter how many creases you make, it is impossible to create permanent, close and overlapping creases due to the material's own resistance to restoring itself. be.

Therefore, using a sheet body that expands and contracts in an accordion style as a part of the skirt as in the above-mentioned published invention can be expected to expand and contract to a certain extent by following the opening and closing of the mold, but the material that makes up the skirt If it is a sheet or film made of synthetic resin with the above-mentioned rigidity, simply adding mountain and valley folds will not allow the pleats of the skirt to overlap closely when the mold is closed. Therefore, it cannot be folded into a small size.

On the other hand, as in the above-mentioned published invention, if the molded product formed in the plastic molding machine scatters when the mold is released, it may come into contact with the quiver or fall on the floor.
It doesn't feel well because of oil stains and dust. To prevent this, curtains should be placed not only below the mold, but also on the opposite side of the operation side in front of the mold opening/closing part so that they touch the tie bars, It is desirable to shield the surrounding area.

In this case, the curtain expands and contracts following the opening and closing of the mold, and especially when the mold is closed, if the folds of the curtain form close folds from the folds between the peaks and valleys, the curtain will expand and contract with a large amount of expansion and contraction. The curtain fits securely within the mold thickness and looks good.

[Means to solve the problem]

Therefore, the present invention is provided to solve the conventional problems and to achieve the object of the invention.

The first aspect of the present invention is an accordion-type curtain,
Mountain folds 13 and valley folds 14 are alternately formed with a predetermined width W on the rigid synthetic resin curtain body 11, and pressure and heat are applied to the folds to form pleats 15 that are tightly folded. It is something that

Next, the second aspect of the present invention is a method for manufacturing an accordion-type curtain, in which a mountain fold line 13' and a valley fold line 14' are formed on a curtain body 11 made of a rigid synthetic resin film with a set width W. set alternately, and the above-mentioned fold line 13'
・It is formed by applying pressure with creases formed at the peaks and valleys from 14' and applying high heat to the extent that the curtain body does not melt, so that the folds formed by the creases overlap closely with each other. be.

The third aspect of the present invention is a method for manufacturing an accordion-type curtain according to claim (1) or an accordion-type curtain according to claim (2). Cut portions 12 having a predetermined length p are provided at a predetermined interval p' along the folding line, excluding both ends in the direction of the folding line.

Furthermore, the fourth aspect of the present invention is a scatter prevention device for ejecting and releasing a molded product in a resin molding machine, in which the fixed mold 9I and the movable mold 92 are Arranging the accordion-type curtain of claim (1) on the front side and the opposite side,
The lateral end portion of the curtain body 11 is attached to the fixed die plate or the fixed mold and the movable die plate or the movable mold so that the positions thereof can be adjusted.

A fifth aspect of the present invention is a scattering prevention device for ejecting and releasing a molded product in a resin molding machine, when the area around the mold opening/closing part is shielded with the accordion-type curtain according to claim (1). The curtain body 11 is tilted at a predetermined angle θ so that the lower part of the curtain body 11 is located inside the lower tie bars 83 and 84, and the upper part is located outside of the lower tie bars.

[Operation] The operation based on the above means will be explained. When no tension is applied to an accordion-style curtain, the stiffness of the curtain body made of synthetic resin film allows the folds, which face the mountain folds and valley folds, to closely overlap each other at the crease border. It is folded up.

In this state, if you pull both ends of the accordion-style curtain in the direction of the crease between the peaks and valleys toward the opposite sides,
The folds, which are tightly folded and folded, stretch against the rigidity of the synthetic resin film.

Then, when the tension at both opposite ends is released, the accordion-style curtain is folded from the stretched state again by the restoring force due to the rigidity of the film, alternating the peaks and valleys, and folding in the direction in which the pleats are brought into close contact with each other. Return to original state.

Next, a process for attaching an accordion-style curtain around the opening/closing part of a mold for resin molding will be explained.

First, during mold clamping, in the part that shields the area around the fixed mold and movable mold around the separation line between the fixed mold and the movable mold, both ends of the peaks and valleys of the accordion curtain in the folding direction are opposite to each other. The total length in the lateral direction of the curtain body attached to die plate 1 or a mold via a magnet attachment tool or other attachment device and arranged between the opposing die plates or molds is in an accordion shape. It is folded.

From this state, when the movable die plate side opens the mold with a set stroke as the resin molding process is completed, the synthetic resin film curtain body follows the movable mold and extends from the accordion state, thereby causing the mold to open. By shielding both sides of the space, the molded product ejected through the ejector and separated from the movable mold can be
Even if the particles come into contact with the tie bar or are scattered outside the intended storage location, they are reliably guided to the discharge port by the curtain body and stored in the container.

Then, when the movable mold moves forward toward the fixed mold in order to clamp the mold again, the curtain body follows and returns to its original position while folding the pleats closely together. The process ends.

〔Example〕

The present invention will be described in detail below. Fig. 1 is a perspective view of the accordion-type curtain of the invention in a half-open state, Fig. 2 is a plan view of a part of Fig. 1, and Fig. 3 is a section 3-3 of Fig. 1. 4 is a plan view of FIG. 2, FIG. 5 is a front view of the injection molding machine with the operation side in front of the mold and the vicinity of the opening/closing part on the opposite side shielded, and FIG. 6 is a plan view of FIG. Fig. 5 is a plan view, Fig. 7 is a sectional view taken along the line 7-7 in Fig. 5, Fig. 8 is a perspective view showing a part of the curtain body and the magnet mounting device installed, and Fig. 9 is a sectional view taken along line 7-7 in Fig. 5. Developed front view of curtain body, 1st
Figure 0 is a front view of an existing injection molding machine, Figure 11 is a schematic cross-sectional view taken along line 11-11 in Figure 10, and Figure 12 is a diagram showing how the curtain body is folded into an accordion shape to create permanent creases. FIG. 2 is a schematic front view of the press and high heat generation device.

In FIGS. 10 and 11, reference numeral 1 denotes a generally popular and well-known resin molding machine, which includes a frame 2, an injection mechanism section 3, a mold opening/closing mechanism 4, and a hydraulic drive section 5 for opening and closing the mold.
It consists of an electrical control section, etc.

The frame 2 is a part that can be called a base and is equipped with an injection mechanism part 3, a mold opening/closing mechanism 4, a hydraulic drive part 5, etc., and the flat part 2. is provided with a port 16' for discharging the molded articles.

Further, the injection mechanism section 3 measures, melts, and injects the injection molding material.

The mold opening/closing mechanism 4 includes a mold 9 (91,
92) is closed with a pressure higher than the injection pressure to prevent it from opening, and when the injection molding is finished and the molding resin has solidified, an ejector is used to open the mold and eject the molded product. There is also a fixed die plate 6 and a movable die plate 7 for opening and closing the mold, and tie bars 8 (81 to 84) supporting the fixed die plate 1- and the movable die plate to move the mold 9. ).

The hydraulic drive unit 5 for mold clamping and mold opening connects the injection mechanism to a pump that supplies power to a hydraulic cylinder for mechanical operation in the mold opening and closing mechanism, a pressure control valve,
It consists of directional switching valves, flow control valve control parts, oil tank hydraulic piping, etc.

In Figures 1 to 3, reference numeral 11 is a curtain body made of synthetic resin film, and the material may be any material as long as it has appropriate rigidity and flexibility, but for example, transparent polyester resin film can be used. etc. are suitable.

12 is the width W that is set when the curtain body 11 is a single piece of fabric that has not yet been made into an accordion shape, as shown in Figure 9.
Along the mountain fold line 13' of the mountain fold part and the valley fold line 14' of the valley fold part, which were positioned in This is the notch.

Each of the notches 12 has small-diameter holes 12 at both ends thereof.
1 can be formed.

13 and 14 are the synthetic resin film curtain body 1 described above.
1 is a mountain fold and a valley fold which are set alternately with a constant width W, and 15 is a pleat formed by the crease of the mountain fold and the valley fold.

26 is folded by alternately forming mountain folds and valley folds along the pleats 15, applying pressure from the plane and the bottom, and applying high heat to the extent that the curtain body 11 does not melt. This is a pressing and high heat generation device in which the facing surfaces of the folds 15 of the peaks and valleys are closely folded to form a folded state.

5 to 7 show a fixed mold 91 between the fixed die plate 6 and the movable die plate 7 in the resin molding machine 1 described above.
An accordion-type curtain body 11 made of synthetic resin film is arranged on the opposite side of the operation side in front of and the movable mold 9□, and on the opposite side of the tie bar 8 (81 to 84). The die plate 6, 7 or the mold 9. is attached to the die plate 6, 7 or the mold 9.・It is installed on the 9□ side.

The curtain body 11 has its lower part connected to the lower tie bar 8 on the operation side and the opposite side of the mold 9 (91, 9□).
3 and 84, and the upper part is located outside of the same lower tie bars 83 and 84, and is arranged so as to be inclined at a predetermined angle θ, as shown by the chain line 11' in Fig. 7. Tie bar8.・83.8□・It may be installed vertically on the opposite inner side of 84.

As shown in FIG. 8, a vertically long hanging member 17 is attached to both ends of the curtain body 11 in the horizontal direction at the magnet attachment site.
・To show the means for attaching 17', small holes 19 are made in the vertical direction at both ends of the hanging member and the curtain body 11, and a synthetic resin regent-shaped fastening tool 18 that fits the small holes in the vertical row is used. That's the end.

In addition, 20 in the figure indicates a magnet mounting tool, in which the magnetic pole face of the magnet piece 20□ is held between two yokes 203, and the end faces on the plate thickness side of the two sides sandwiching the - corner are the attraction parts 204 and 204. A flat magnet body 201 is housed in a split holder 205 so as not to block the suction part, and a hook part 206 is formed at the opposite position facing the suction part to form a structure having a hole 207. There is.

Reference numeral 21 denotes a connecting device for connecting the magnet attachment device 20 to both ends of the accordion-type curtain body 11 in the left-right direction,
A hole 21 is rotatably coupled to a hole 207 of a hook 206 of the magnet attachment at its base end. Open it and insert the shaft rod 22 into it.
is inserted and secured with a stopper member 24 with a string 23 attached. A vertically long hooking member 17 is provided at the other end of the connecting member.
T-shaped protrusion 17. A concave groove 21 □ is formed to fit into the groove 21 □ so that it can be slid by hand in the vertical direction while resisting moderate friction, and it can be stopped at a predetermined position.

25 is a down guard made of a synthetic resin film that is arranged in opposing parts below the fixed mold and movable mold sides and is made into an accordion fold that can be expanded and contracted in the same way as the curtain body 11, or in the form of a single piece of fabric that does not stretch. show.

〔Example of use〕

An example of use or a working process of the present invention based on the above-mentioned embodiment will be explained.

In FIGS. 5 to 7, the mold 9 (91, 9□) attached to the fixed die plate 6 and the movable die plate 7 is closed and in a clamped state. At this time, the accordion-type curtain body 11 made of synthetic resin film is located between the die plate or the side surface of the mold and the tie bars, with its lower part located inside the lower tie bars 83 and 84, and its upper part positioned inside the lower tie bars 83 and 84.・It is placed in a tilted position at position -15= on the outside of 8□.

Then, the heating cylinder 31 of the injection mechanism section 3 in the injection molding machine 1 shown in FIGS. The injection molding process is then completed using a known injection molding machine.

When the movable die plate 7 opens the mold upon completion of injection molding, it moves from the mold thickness distance shown in Fig. 5 to daylight S (L+S') with the set mold opening stroke S', and the set width W. The left end of the curtain body 11 that was folded in an accordion shape on the movable mold 92 side moves to follow the retreat of the movable mold, creating an open space between the fixed mold 91 and the movable mold 9□. Both sides a-a' of the mold 9, 9□ on the operation side and the opposite side are shielded.

In this state, when the injection molding process is completed and the molded product is released from the mold 9 by the ejector 10 in conjunction with the mold opening of the movable die plate 7 and dropped into the discharge inlet 16', the molded product is The item is ejector 10
By separating from the movable mold 9□ under the pressure of The particles reach a predetermined discharge portion 16 while being prevented from being scattered by the curtain body 11 or by the down guard 25 added to the curtain body 11 .

Then, when the movable mold 9□ is advanced by the set stroke S' toward the fixed mold 9I in order to perform mold clamping again, the curtain body 11 is folded closely in an accordion-like manner. The mold is returned to its original position in the mold-clamped state shown in FIG.

〔Effect of the invention〕

Since the present invention has the above configuration, it has the following effects.

In the accordion-type curtain body and the manufacturing method thereof according to claims (1) and (2), the curtain body made of a synthetic resin film having rigidity and flexibility has alternating mountain folds and valley folds with a set width. By pressing the curtain body while applying high heat to the extent that it does not melt,
Conventionally, it is strong and durable because it is formed so that it can be folded with the creases that cannot be returned to its original shape and the folds overlap closely, but due to the reaction force due to the rigidity of the curtain body itself. By simply bending, it is possible to reliably and easily form an accordion-shaped film using a polyester resin or similar synthetic resin film that does not have a permanent bending tendency.

Further, in the accordion-type curtain according to claim (3), cut portions having a predetermined length are provided at predetermined intervals along the mountain fold portion and the valley fold portion, excluding both ends in the fold direction. This allows the curtain body made of a rigid synthetic resin film, typically polyester resin, to be accurately folded along the notches that define the peaks and valleys, and even when folded multiple times and the pleats overlap, The position of the multiple folds does not shift.

Furthermore, in the scattering prevention device for ejecting and releasing a molded product during resin molding according to claim (4), between the opposing fixed guide plate I and the movable die plate, the operating side in front of the mold opening/closing part Claim (1) on the opposite side
By arranging an accordion-type curtain, and attaching both lateral ends of the curtain body to the fixed die plate or fixed mold and the movable die plate or movable mold so that the positions can be adjusted. By shielding the area around the opening/closing part of the mold in a resin molding machine, when the processed molded product is ejected by the pressure of the ejector and flies in all directions, it will come into contact with the curtain body and bounce inward, preventing it from being ejected. Since the molded product falls into the entrance of the curtain, it does not come into contact with oily tie bars or fall onto the floor, the curtain body is not damaged, and the molded product is stored in the designated container through the discharge section. Ru. Therefore, the yield of processed molded products is improved, and production efficiency is improved.

In the scattering prevention device for ejecting and releasing a molded product in a resin molding machine according to claim (5), when shielding the periphery of the mold opening/closing part in the resin molding machine, the scattering prevention device according to claim (1) is provided.
By slanting and installing the accordion-style curtain so that the lower part is located inside the lower tie bar and the upper part is located outside the lower tie bar, it is possible to use a mold that is large in the width direction of the die plate. It can be used to expand the range of applications.

Furthermore, if the lower end of the curtain is set to a length that extends downward from the inlet for discharging molded products and hangs down, prevention of scattering of the molded products can be more reliably ensured. Furthermore, when a down guard is combined with the hanging curtain and its both ends are connected, an enclosing frame is formed and the anti-scattering effect is further improved.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an accordion-type curtain according to the present invention in a half-open state, FIG. 2 is a plan view of a part of FIG. 1, and FIG.
The figure is a cross-sectional view taken along line 3-3 in Figure 1, Figure 4 is a plan view of the folded state in Figure 2, and Figure 5 is the opening/closing part of the injection molding machine on the operation side in front of the mold and on the opposite side. Figure 6 is a front view with the surrounding area shielded, Figure 6 is a plan view, Figure 7 is a sectional view taken along line 7-7 in Figure 5, and Figure 8 is a perspective view of a part of the curtain body and the installation of the magnet attachment. Figure 9 is an exploded front view of a part of the curtain body, Figure 10 is a front view of an existing injection molding machine, and Figure 1 is a front view of an existing injection molding machine.
Figure 1 is a schematic cross-sectional view taken along line 11-11 in Figure 10.
FIG. 2 is a schematic front view of a pressing and high heat generating device for folding the curtain body into an accordion shape to form a permanent crease. 1... Injection molding machine 2... Frame 3... Injection mechanism 4... Mold opening/closing mechanism 5... Hydraulic drive unit 6... ... Fixed die plate 7 ... Movable die plate 8 (8, ~ 84) ... Tie bar 9 (91, 9□
)...Mold 10...Ejector 11...Rigid synthetic resin film 11 Curtain body 12...Cut portion 13... ... Mountain fold part 14 ... Valley fold part 15 ... Fold part 16 ... Pressing and high heat generating device 17, 17' ... Hanging member 18 ...... Fastening tool 19 ... Hole 2 made in the curtain body and hanging member
0... Magnet mounting tool 25... Down guard 26... Pressing and high heat generating device

Claims (5)

[Claims] (1) Curtain body made of rigid synthetic resin film (
Creases of mountain folds (13) and valley folds (14) are formed alternately with the set width (w) in step 11), and pressure and high heat are applied to these folds to form folds (15) between the peaks and valleys. Accordion-style curtains are characterized by closely folded layers. (2) Curtain body made of rigid synthetic resin film (
11) With the set width (w), fold the mountain fold line (13')
The folding lines (14') of the crests and troughs are set alternately, and pressure is applied with the ridges and troughs formed with creases, and high heat is applied to prevent the curtain body from melting. 1. A method for manufacturing an accordion-style curtain, characterized in that the folds of the curtain are formed so that the folds of the curtain are closely folded over each other. (3) A notch (12 ) are provided at a predetermined interval (p').
or the method for manufacturing an accordion-style curtain according to claim (2). (4) Between the opposing fixed die plate (6) and movable die plate (7), an accordion-type curtain according to claim (1) is installed on the operation side in front of the opening/closing part of the mold (9) and on the opposite side. At the same time, the curtain body (11
) is attached to the fixed die plate (6) or the fixed mold (9_1) and the movable die plate (7) or the movable mold (9_1) so that the attachment position can be adjusted. Features: A device to prevent scattering during ejection and release of molded products during resin molding. (5) When shielding the periphery of the mold opening/closing part using the accordion-type curtain according to claim (1), the lower part of the curtain body (11) is positioned inside the lower tie bars (8_3, 8_4), and 1. A scattering prevention device for ejecting and releasing a molded product in a resin molding machine, the device being installed so as to be inclined at a predetermined angle (θ) so that the upper part is positioned outside the lower tie bar.