JPH0924515A - Device for pelletizing raw material of synthetic resin for injection molding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a superminiaturized and low-priced device for pelletizing a raw material of synthetic resin for injection molding which is capable of repelletizing, to a desired size, crushed runner pieces obtained from the separation and crushing work of moldings produced in each shot of injection molding process at a molding shop. SOLUTION: An electric motor M for driving a hot screw press P is installed at an appropriate place in a metal enclosure B, and a hot screw press P is fixed on the top of this metal enclosure B in such a manner that the press P can be freely driven by a belt power transmission method. In addition, a nozzle N and a guide groove G are mounted on the hot screw press P in such a manner that the former two are faced outwardly. Further, a rotary cutter C is arranged so that the cutting operation is performed right below a strand suspension part. Consequently, the entire configuration of this device for pelletizing a raw material of synthetic resin for injection molding is superminiaturized and is provided at a low price, and thereby, the quality of the molding is improved and the rational promotion of recycling natural resources is achieved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention is a peripheral device for molding processing, which is absolutely essential in a so-called general synthetic resin molding factory where molding is carried out. It is no exaggeration to say that this is the field that covers all fields of general synthetic resin molding plants throughout Japan.

[0002]

2. Description of the Related Art In a so-called general synthetic resin molding factory where molding is conventionally carried out, a precision molding is mainly carried out mainly for the purpose of recycling resources. In this kind of industry, for example,
With regard to the method in which the crushed pieces obtained by a runner crusher or the like are mixed with the virgin raw material for synthetic resin molding and immediately molded, various serious problems are still built in. From the viewpoint of "...", it is said that the crushed pieces of the runner, sprue, etc. are separately subjected to pelletizing and reclaiming processing using an extrusion molding machine, etc., and then mixed with the virgin raw material for synthetic resin molding and reused. It can be said that the current situation is that we have reached the present while trying new methods. But,
The so-called reclaiming device for pelletization, which has already been described, has been based on the mechanism as mentioned before for some time, and several types of similar devices have been used in this kind of industry or related markets. It is often the place to see it on the market. However, all of the pellet regenerators described above have major problems in the basic aspects as described below. That is, First of all, the point is that it is a substitute for being profound and enormous. In other words, in this type of conventional known product, in the pellet molding machine, each element (hot screw press, driving electric motor, other accessories, etc.) that constitutes the device itself is Since all of them have a basic design that can be combined linearly, it can be seen that the length dimension of them is as long as 1.5 meters, so it is a narrow space even for just one person. In general molding factories and town factories, where there is no foothold, it is a working space, and the reality is that a long-standing substitute is called Mappira pardon. . Although it is related to the item, it is not a forgiveness that the main body device itself is long, but in addition to that, it can be said that it is profound. It is often seen, for example, in the following points. That is, the strands kneaded by the hot screw press are often cooled and solidified,
The point is that a step of winding the air cooling drum is provided. That is, it is a matter of course that each element itself is relatively large, and if the number of the elements is increased, it is natural that the element itself becomes heavy and large. . According to the above and paragraphs, no matter how excellent the ability and characteristics, etc. of the peripheral equipment for molding processing, is an instrument, after all, it is too heavy and long, so it is specialized in molding around there. It can be said that there is a serious problem in the fundamental design in order to be useful in the Nomachi factory. . Further, the so-called heavy-duty and long-length instrument in the above items is designed to handle a large-capacity runner or a number of types of many runners and sprues. Things are clear. Therefore, even in terms of its price, it costs as much as millions of yen per unit, so although it exists as one of the peripheral equipment for injection molding processing, for example, For each synthetic resin raw material that changes colors,
At the worksite where each runner pellet had to be regenerated, it was inevitable that it would cause troublesome problems. As described above, as will be described in detail, in the pellet molding machine based on the technology of the conventional known example, it is fundamental and serious that it cannot match the various conditions of the actual molding factory. It can be said that today, the day when such problems lay down, it is today.

[0003]

In the preceding paragraph, as described in detail above, the basic design of the pellet molding apparatus for synthetic resin molding processing based on the conventionally known technology A number of serious problems that arise from above ...
As a peripheral equipment for synthetic resin molding, the problem of occupied space (in this case, it is more appropriate to describe it as occupied space space), the price problem due to the heavy, heavy and large construction, and moreover, Such serious quality problems that occur in molded products that arise as a result, etc. have all come to the present day as extremely important themes that require quick resolution. Therefore, the root of the suppression of such serious problems is
When investigating and examining the root cause of where it exists, I touched on it a little in the previous section, but in the existing synthetic resin pellet molding equipment of this kind, a simple idea and In addition, it must be said that it was caused by a design idea that was made into a rut. That is, as described above, in the conventionally known pellet molding apparatus,
Each element that composes the device itself was "a basic design that was complete if everything was connected linearly to a rabbit." In addition to that, even if each individual element that constitutes the molding apparatus is taken up, a relatively large shape is used, and further,
The structure itself was complicated, "
In order to solve the problem, first of all, linear combination, that is,
The so-called direct connection conduction method, where the geared motor, which is the drive source, was directly connected to the screw shaft of the hot screw press, was immediately improved, and it was possible to change from the direct connection conduction method to the winding conduction method. From the viewpoint that there is no prospect, depending on the adoption of the chain conduction method as one of the winding conduction methods,
All of the difficult problems mentioned above have been solved at once. In addition, as for the parts of the constituent elements, small, simple,
In combination with the fact that the short circuit was carried out as a basic design principle, it was a great step toward solving difficult problems.

[0004]

As has been described in detail in the preceding paragraph, the present invention has been found to realize its realization even if it is the most rational and yet fundamental solution. As described in detail, serious problems in the installation of peripheral equipment such as injection molding processing (so-called problem of work space such as molding factory), or quality problems of molded products caused by these,
... all the difficult problems are all cleared at once, and furthermore, due to the extremely simple structure, the price is cheap and cheap, and it is possible to make it compact and compact, and so on. There are immeasurable practical effects. The means for solving such a problem are as follows. That is, also in the preceding paragraph, in the synthetic resin raw material pellet molding apparatus based on the conventionally known technology as described above, it is too heavy and extremely large (for example, its length or In most cases, the device of the present invention relates to a driving force transmission system, and a winding conduction system (for example, chain conduction system, timing
By adopting a belt method, a rope conduction method, etc.), it has become possible to hold the length of the rope and the length of the conventional product, which is less than half of that of conventional products, and can be held at about 0.6 meters. It is a thing. Further, the structure is simple, that is, the tip of the hot screw press is fitted with a nozzle having a desired hole diameter and the kneaded strand from the nozzle is introduced into the guide groove. A rotary cutter was provided so as to hang it down and cut it as a regenerated pellet of a desired length in advance at its terminal portion, thereby constituting the present invention "injection molding synthetic resin raw material pellet molding apparatus". It is a thing.

[0005]

The "injection molding synthetic resin raw material pellet molding apparatus" according to the present invention is constructed based on the means for solving the problems as described above. In the case where a structure based on a synthetic resin raw material pellet molding machine "is installed in an injection molding machine in a general synthetic resin molding plant, etc., in an appropriate place near the periphery, the embodiment shown in FIG. As is clear from the above, when performing molding processing in the molding factory, etc., the runners, sprues, etc. generated by the operation of the injection molding machine are crushed by a crusher (generally, a runner crusher is used. ), And the resulting crushed pieces of runner are shown in FIG. 1 in a hopper (H) (in FIG. 1, indicated by a chain double-dashed line).
If an appropriate amount is introduced from the opening, it is supplied from the hopper (H) to the hot screw press (P) which passes through the chute (S) and is provided directly below the chute (S). The runner crushed pieces supplied to the hot screw press (P) are immediately melted by an electric heater or the like (not shown) arranged around the circle of the hot screw press (P), With the propulsive force based on the rotation of the screw of the hot screw press (P),
While being kneaded, it finally becomes a kneading strand and is sequentially sent out. Thus, the kneading strand is
The nozzle (N) mounted facing the tip of the screw press (P) (the size of the desired pellet,
That is, the diameter of the pellet (meaning the diameter size), to form a strand of a desired diameter in advance,
The strand from the nozzle (N) is further introduced into the guide groove (G). However, the strand introduced into the guide groove (G) is hung down while passing through the guide groove (G) due to gravity. At such an intermediate stage of the process until the kneaded strand is hung down while passing through the guide groove (G), cooling air blow (→ mark, ↓ in FIG. 1) is performed.
The flow of cooling air is indicated by a mark, a ↑ mark, etc.), and it is cooled and solidified to an appropriate hardness. Thus,
The strands, which have been solidified by cooling to an appropriate hardness, are cut one after another to an appropriate length by a rotary cutter (C) provided in a position where they face each other, and injection is performed here by a recycled material. It is said that the synthetic resin raw material pellets for molding will be mass-produced. As described above, the recycled pellets are mass-produced based on the operation described in detail.

[0006]

EXAMPLE An example of the "injection molding synthetic resin raw material pellet molding apparatus" of the present invention will be described with reference to FIG. still,
In this embodiment, for example, the number of blades of the rotary cutter (C) for strand cutting is two blades, but in general, a plurality of blades (two blades, four blades, ...) Are required. As is apparent from the embodiment shown in Fig. 1, when performing molding processing in a molding factory, etc., runners, sprues, etc. generated by the operation of the injection molding machine are crushed. A hopper (H) (shown by a chain double-dashed line in FIG. 1) which is placed on a machine (which generally uses a runner crusher) and the resulting runner crushed pieces are shown in FIG. If you put in an appropriate amount from the department,
The hopper (H) passes through the chute (S) and is supplied to a hot screw press (P) which is provided just below the chute (S). The runner crushed pieces supplied to the hot screw press (P) were immediately
Arranged around the circle of the hot screw press (P),
Although it is melted by an electric heater or the like (not shown), it is sequentially kneaded by the propulsive force based on the rotation of the screw of the hot screw press (P), and finally becomes a kneading strand and is sequentially sent out. Thus, the kneading strand is mounted so as to face the tip of the hot screw press (P), and the nozzle (N) (meaning the desired pellet size, that is, the pellet diameter size).
A strand having a desired diameter is formed in advance by passing through the nozzle, and the strand from the nozzle (N) is further introduced into the guide groove (G). However,
The strand introduced into the guide groove (G) is hung down while passing through the guide groove (G) due to gravity. At such an intermediate stage of the process until the kneaded strand is hung down while passing through the guide groove (G), cooling air blow (→ mark, ↓ mark, ↑ mark, etc. in FIG. 1) is performed. The flow of cooling air is shown), and it is cooled and solidified to an appropriate hardness. Thus, after being cooled and solidified to an appropriate hardness, the
The strands are successively cut by a rotary cutter (C), which is provided in a position opposed to each other, to an appropriate length, and mass production of synthetic resin raw material pellets for injection molding depending on a recycled material is carried out here. It is said that.

[0007]

As described above, according to the apparatus of the present invention, the following practical effects can be obtained. That is,
First of all, the greatest effect of the device of the present invention is that it is lighter, thinner, shorter, and smaller in size than the conventionally known device of this type, and its price is incomparable. Since it can be provided at a reasonable price, it can be immediately adopted and can be operated immediately in any department such as a general synthetic resin molding factory, above all, a synthetic resin honey processing factory. Furthermore, the following is a detailed and detailed list of various effects. . Even though it is light, thin, short, and extremely small, its configuration is very simple, so it can be provided at a low price in terms of its price. Therefore, it can be very easily introduced as one of peripheral equipments for molding processing not only in general molding factories but also in molding factories found in other town factories. . Depending on the item, for example, it can be introduced into an injection molding machine as part of a one-by-one system, so that the quality of a molded product is dramatically improved. . Contamination troubles caused by changing the resin color of each molded product are eliminated. . It enables rational processing of recycling of synthetic resin raw materials. . Since it is a pellet recycling process based on a rational processing method, it is possible to perform one-line system production for injection molding process. . Depending on the item, you can fulfill the responsibility of environmental conservation around the molding factory. In addition, since the device of the present invention has a compact compact structure, it is extremely easy to install an existing molding machine, etc., etc. “Synthetic resin raw material pellet molding device for injection molding” according to the present invention I believe that he can make a great contribution to this kind of molding industry because it is reasonably and economically and has a great practical effect, but there is no doubt anymore.

[Brief description of drawings]

One embodiment according to the present invention is shown in FIG. In addition, in FIG. 1, regarding the "injection molding synthetic resin raw material pellet molding apparatus", a partially omitted partial cutaway essential portion sectional front view is shown, and (H) in the figure shows a hopper. Is indicated by a two-dot chain line. In addition, in each symbol in the figure, (L),
(L) is a chain conduction sprocket wheel,
(T) is a transmission chain, and (W) and (W) are moving casters.

[Explanation of symbols]

 B Metal casing C Rotary cutter G Guide groove H Hopper L, L Sprocket wheel M Drive motor P Hot screw press S Chute T Conduction chain W, W Transfer caster I ・ P ・ M Synthetic resin for injection molding Raw material pellet molding machine

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Office reference number FI technical display location B29C 47/84 9349-4F B29C 47/84 // B29K 105: 26

Claims (1)

[Claims] 1. A hot screw press (P), a driving electric motor (M), a nozzle (N) mounted on the hot screw press (P), a groove (G) for guiding a kneaded strand, and a rotary. Cutter (C)
A rectangular parallelepiped that is made up of elements such as, and is mainly used for recycling crushed pieces such as runners and sprues that are generated during injection molding, and that forms the base in a synthetic resin raw material pellet molding machine for injection molding. The electric motor (M) for driving the hot screw press (P) is installed at an appropriate place in the space inside the metal casing (B), while the electric motor (M) for driving the hot screw press (P) is installed on the upper portion of the metal casing (B). The hot screw press (P) is fixedly formed so that the rotational driving torque from the driving electric motor (M) can be driven by the winding transmission system. (P) A nozzle (N) of a desired sizing is attached to the tip of the kneading strand from the nozzle (N) and introduced into the guide groove (G) to hang it. Terminal part As for cutting as previously desired to length of recycled pellets Te, wherein the cells that were constructed allowed provided a rotary cutter (C), a synthetic resin material pellets molding device for injection molding (I · P · M)