JP2021003680A - Resin production equipment - Google Patents

Abstract

To provide resin production equipment capable of efficiently providing an excellent-quality resin.SOLUTION: An outlet portion of a cylinder 30 functions as a filtering portion in which a laminated filter 40 is arranged, and resin solution is filtered by the laminated filter 40, resulting in removal of aluminum piece. The laminated filter 40 is constituted by overlapping circular sheet-like filters 51-55 each other. A rectangular mesh is formed in each of the filters 51-55 by vertically-laterally knitting metallic fibers. In the laminated filter 40, filter accuracy of filters 51-55 is settled in such a way that a value equal to integral multiple of a filter accuracy value of one of adjacent filters differs from that of the other of adjacent filters. The filter accuracy is the number of vertical metallic fibers per one inch.SELECTED DRAWING: Figure 3

Description

The present invention relates to a resin manufacturing apparatus for obtaining a resin by removing metal pieces from a raw material resin containing metal pieces.

Resins such as plastics are used in various fields, and since they are used in large quantities, they are often recycled. When the resin is recycled, for example, as described in Patent Document 1 below, foreign matter is removed from the raw material resin by heating the raw material resin and filtering the resin solution dissolved in the solution or the like. To. Further, Patent Document 2 below describes a configuration in which a raw material resin is filtered using a laminated filter in which a plurality of plate-shaped filters are laminated.

Patent No. 2819209 Japanese Unexamined Patent Publication No. 2004-066767

However, the conventional method has a problem that it is difficult to efficiently obtain a high-quality resin. That is, in order to obtain a good quality resin without (or with little) foreign matter, it is necessary to improve the filtration accuracy of the filter. However, in this case, clogging of the filter is likely to occur, the life of the filter (replacement cycle) is shortened, and the productivity is lowered. On the contrary, if the filtration accuracy of the filter is lowered, the removal rate of foreign substances is lowered, and the quality of the obtained resin is lowered.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a resin manufacturing apparatus capable of efficiently obtaining high-quality resin.

In order to achieve the above object, the resin manufacturing apparatus of the present invention is a resin manufacturing apparatus for obtaining a resin by removing the metal pieces from a raw material resin containing a metal piece, and a heating unit for heating the raw material resin to obtain a resin solution. A stack of sheets formed by arranging a plurality of sheet-shaped filters in which a rectangular mesh is formed by knitting metal fibers vertically and horizontally. When the filter accuracy is the number of vertical or horizontal metal fibers arranged per unit length for each filter constituting the laminated filter, the filter accuracy of one of the adjacent filters is determined. The value multiplied by an integral is characterized in that it is different from the value of the filter accuracy of the other filter.

The plurality of filters are arranged in a plane parallel to the filter so that the center position of the one filter and the center position of the other filter are different when observed from the flow direction of the resin solution. It is preferable that the position is determined and arranged.

The plurality of filters are arranged so that the metal fibers of the one filter and the metal fibers of the other filter are not parallel to each other so that the rotation positions in the plane parallel to the filters are determined and arranged. preferable.

According to the resin manufacturing apparatus of the present invention, a high-quality resin can be efficiently obtained.

It is explanatory drawing which shows the manufacturing process of a resin. It is explanatory drawing which shows the structure of the resin manufacturing apparatus. It is explanatory drawing which shows the structure of the laminated filter. It is explanatory drawing which shows the comparative example in which the gap is not formed between the metal fiber of the adjacent filter. It is explanatory drawing which shows the Example in which the gap was formed between the metal fiber of the adjacent filter. It is explanatory drawing which shows the example which arranged the filter by shifting the position of the center. It is a top view which observed the depression from the direction in which a resin solution flows. It is explanatory drawing which shows the example which arranged the filter by shifting the rotation position.

As shown in FIG. 1, the resin manufacturing apparatus 10 of the present invention filters the raw material resin carried in from the front-end process 12 to remove foreign substances, and carries out the obtained resin to the back-end process 14. In the previous step 12, the raw material resin is produced from the resin product containing the resin. In the present invention, the resin product used as the raw material of the raw material resin is a defective product (defective product in the factory) generated in the manufacturing process of the individually packaged contact lens, and is a normal product to be distributed to the market before being distributed to the market. It is separated from.

In this way, by using defective contact lenses in the factory as raw material for the raw material resin, high quality resin can be efficiently obtained. In other words, contact lenses and their packages (packaging bodies) may be collected and recycled at stores such as eyeglass stores, but such used products are being used by users or Unexpected foreign matter that does not occur in the contact lens manufacturing process (inside the factory), such as dirt that adheres after use, may adhere. On the other hand, it is unlikely that such unexpected foreign matter is attached to defective products in the factory generated in the manufacturing process. In particular, contact lenses require higher quality control than general resin products due to the nature of the product, which comes into direct contact with the eyes of the user, so the possibility of unexpected foreign matter adhering to it is negligible. Low. Therefore, the resin manufacturing apparatus 10 does not need to consider the adhesion of unexpected foreign substances, and can be configured specifically for removing the expected foreign substances, so that a high-quality resin can be efficiently obtained. The foreign matter that is expected to be contained in the defective product in the factory of the contact lens is aluminum contained in the package of the contact lens.

In the previous process 12, defective products in the factory generated in the manufacturing process of contact lenses are crushed into powder, and aluminum is separated from the powder by a well-known separation method utilizing differences in specific gravity and optical characteristics. Let me. Then, the separated powder of aluminum is carried into the resin manufacturing apparatus 10 as a raw material resin. As described above, the raw material resin is processed to separate aluminum, but aluminum cannot be completely removed only by the above-mentioned treatment, and the raw material resin contains aluminum pieces (metal pieces). ing. As will be described later, the resin manufacturing apparatus 10 removes the aluminum pieces remaining in the raw material resin in this way, and has a configuration specialized for this.

As shown in FIG. 2, the resin manufacturing apparatus 10 includes a heating stirrer 20 (heating unit) and an extruder 22. The heating stirrer 20 includes a main body tank 24 into which the raw material resin carried in from the previous step 12 is charged, and generates a resin solution by heating and melting the raw material resin in the main body tank 24 while stirring. .. Further, the additive tank 26 is connected to the main body tank 24. The additive tank 26 stores a viscosity reducing agent for reducing the viscosity of the resin solution, and the main body tank 24 is charged with the viscosity reducing agent in addition to the raw material resin, and these are heated and stirred. Produces a resin solution.

The extruder 22 includes a cylinder 30. The cylinder 30 is a flow path through which the resin solution flows. The cylinder 30 has a circular cross section and is formed in a horizontally long passage shape. One end (the left end in the figure) is an inlet for the resin solution, and the other end (in the figure). The right end) is the outlet where the resin solution is carried out. A hopper 32 is provided at the entrance portion of the cylinder 30, and the resin solution is charged into the inside of the cylinder 30 via the hopper 32. A screw 34 is arranged inside the cylinder 30. The screw 34 has wings 38 spirally erected on the outer periphery of the rotating shaft 36 parallel to the longitudinal direction of the cylinder 30, and the driving force is supplied from a driving force generating means (not shown) such as a motor to the rotating shaft 36. Rotate around the axis. When the screw 34 rotates, the resin solution inside the cylinder 30 is pushed out by the wings 38 toward the outlet portion of the cylinder 30. The outlet portion of the cylinder 30 is a filtration unit 42 in which the laminated filter 40 is arranged, and the resin solution is filtered by the laminated filter 40 to remove aluminum pieces and is extruded (carried out) from the cylinder 30. Cylinder).

As shown in FIG. 3, the laminated filter 40 is a laminated (laminated) sheet-shaped filters 51 to 55 having a circular shape (in the present embodiment, an outer diameter of about 165 mm). In this embodiment, an example in which five filters 51 to 55 are used will be described, but the number of filters used may be 2 to 4 or 6 or more.

A circular recess 60 is provided at the outlet portion of the cylinder 30. The inner diameter of the recess 60 is substantially equal to the outer diameter of the filters 51 to 55, and is formed to be one size larger than the inner diameter of the cylinder 30 (inner diameter 145 mm in this embodiment), and the filters 51 to 55 are formed in the recesses. It is arranged on the inner circumference of 60. Then, the filters 51 to 55 are sandwiched between the holding frame 62 detachably provided at the outlet portion of the cylinder 30 and the outlet portion of the cylinder 30. The filters 51 to 55 are not prepared as an integral body in a state of being fixed to each other, but are individually prepared in a state of being separated from each other of the filters 51 to 55. Then, by being arranged in the recess 60 and being pressed by the pressing frame 62, adjacent filters are adhered to each other and laminated to form a laminated filter 40.

Each of the filters 51 to 55 constituting the laminated filter 40 has a rectangular (square) mesh formed by weaving metal fibers (filament-like metal) vertically and horizontally. Here, when the filter accuracy is the number of vertically (or horizontally) metal fibers arranged per unit length (1 inch in this example), the filter accuracy of the filter 51 is "40", and the filter is a filter. The filter accuracy of 52 is "60", the filter accuracy of filter 53 is "200", the filter accuracy of filter 54 is "120", and the filter accuracy of filter 55 is "40". In the present embodiment, for filters having a filter accuracy of 40 to 80 (that is, filters 51, 52, 55), "iron" is used as the metal of the metal fiber, and a filter having a filter accuracy of 100 to 300 (that is, filters). Regarding the filters 53 and 54), the filter is formed by using "stainless steel" as the metal of the metal fiber.

In the resin manufacturing apparatus 10, the filter accuracy of the filters 51 to 55 is determined so that the value obtained by multiplying the filter accuracy of one of the adjacent filters by an integer is different from the value of the filter accuracy of the other filter. Specifically, for two adjacent filters, the filter accuracy of one filter is "30" and the filter accuracy of the other filter is "60 (ie, twice 30)" or "90 (ie, 3 of 30)". The filter accuracy is determined so as not to have a relationship such as "double)". By doing so, the aluminum piece can be removed efficiently.

Hereinafter, using FIGS. 4 and 5, the filters 51 to 55 have the above-described configuration (the value obtained by multiplying the filter accuracy of one of the adjacent filters by an integer is different from the value of the filter accuracy of the other filter). The effect of the present invention according to the configuration) that determines the filter accuracy of the above will be described. FIG. 4 is a reference example to which the present invention is not applied, and the value obtained by multiplying the filter accuracy of one of the adjacent filters 100 and 101 by an integral multiple (double in the example of FIG. 4) is the value of the other filter 101. It is the value of the filter accuracy of. On the other hand, FIG. 5 shows an embodiment to which the present invention is applied, in which a value obtained by multiplying the filter accuracy of one of the adjacent filters 51 and 52 by an integer is different from the value of the filter accuracy of the other filter 52. It has become. In addition, in FIG. 5 and FIGS. 6 and 8 described later, only the filters 51 and 52 are shown in order to avoid complicating the drawings, and the filters 53 to 55 are not shown.

Comparing the example of FIG. 4 with the example of FIG. 5, in the example of FIG. 4, the metal fiber 100a of the filter 100 has the metal fiber 101a of the filter 101 and the direction in which the resin solution flows (direction perpendicular to the filter). They are arranged in an overlapping manner (close contact). Therefore, a gap 70 (see FIG. 5), which will be described later, does not occur between the metal fiber 100a of the filter 100 and the metal fiber 101a of the filter 101. On the other hand, in the example of FIG. 5, some of the metal fibers 51a of the filter 51 are arranged at positions that do not overlap with the metal fibers 52a of the filter 52, and the metal fibers 51a of the filter 51 and the filter A gap 70 is formed between the 52 and the metal fiber 52a. Since this gap 70 also functions as a filter (mesh of the filter), in the example of FIG. 5, a small aluminum piece (smaller than the mesh of the filters 51 and 52) that cannot be removed by the filter 51 or the filter 52 alone. 72 can be captured and removed by the gap 70. On the other hand, in the example of FIG. 4, the aluminum piece 72 smaller than the mesh of the filter 101 cannot be removed.

Such a small aluminum piece 72 has a finer mesh (higher filter accuracy) on the downstream side than the filters 100 and 101 even when the gap 70 does not exist as shown in FIG. It is also possible to provide a "filter (for example, filter 53)" and remove it by this "another filter". However, in this case, since the aluminum piece 72 cannot be removed by the gap 70, all of the aluminum piece 72 is removed by "another filter". For this reason, the burden on the "other filter" is large, and clogging or the like is likely to occur (the life of the filter (replacement cycle) is shortened). On the other hand, in the case of FIG. 5, in order to remove all of the aluminum pieces 72, it is necessary to provide "another filter" on the downstream side of the filters 51 and 52 as in FIG. A part of the aluminum piece 72 can be removed by the gap 70 on the upstream side of the filter. As a result, as compared with the example of FIG. 4 in which all of the aluminum pieces 72 are removed by the "other filter", the load on the "another filter" can be reduced and clogging is less likely to occur (filter life (replacement)). Cycle) becomes longer).

Returning to FIGS. 1 and 2, the resin solution from which the aluminum pieces have been removed by the laminated filter 40 is extruded from the resin manufacturing apparatus 10 and carried into the post-process 14. In the post-step 14, the resin solution is divided into a plurality of flow paths and then cooled by passing through a water tank or the like to solidify the resin to obtain a resin. After that, the solidified resin is cut and shipped in the form of pellets, and is used as a raw material for a new resin product.

In the above embodiment, the inner circumference of the recess 60 in which the filters 51 to 55 are arranged is formed to have substantially the same size as the outer circumference of the filters 51 to 55 (see FIGS. 2 and 3). However, for example, as shown in FIG. 6, the filters 51 to 55 may be arranged in the recess 80 formed to be one size larger than the outer circumference of the filters 51 to 55. In the description using the drawings after FIG. 6, the same members as those in the above-described embodiment are designated by the same reference numerals and the description is omitted. Further, as described above, in FIGS. 6 and 8, only the filters 51 and 52 are shown in order to avoid complicating the drawings.

As shown in FIG. 6, according to the configuration in which the filters 51 to 55 are arranged in the recess 80 formed one size larger than the outer circumference of the filters 51 to 55, the above-mentioned gap 70 (see FIG. 5) is formed more efficiently. it can. That is, in the example of FIG. 6, the filters 51 to 55 are aligned (the arrangement positions of the filters 51 to 55 are adjusted in the plane parallel to the filters so that the filters 51 to 55 overlap at the same position). By simply arranging the filters 51 to 55 in the recess 80 without performing any treatment, the positions of the filters 51 to 55 in the plane parallel to the filter are naturally displaced, and the direction in which the resin solution flows (perpendicular to the filter). When observed from the direction), the positions of the centers of the filters 51 to 55 (in the example of FIG. 6, the position of the center 51c of the filter 51 and the position of the center 52c of the filter 52) are different. In other words, the configuration of FIG. 6 is such that when observed from the direction in which the resin solution flows (direction perpendicular to the filter), the positions of the centers of the filters are different from each other so that the filters 51 to 55 are arranged in a plane parallel to the filter. The configuration is such that the placement position is determined. Then, in this way, the arrangement positions of the filters 51 to 55 in the plane parallel to the filters are displaced (the positions of the centers of the filters 51 to 55 when observed from the direction in which the resin solution flows are different), in particular, adjacent to each other. The gap 70 (see FIG. 5) described above is efficiently formed by shifting the arrangement position (the center position is different) between the matching filters.

When the resin solution flows in the horizontal direction (see FIG. 2) as in the above-described embodiment, that is, when the filters 51 to 55 are arranged vertically, the filters 51 to 55 move downward due to their own weight. Towed. Therefore, if the recess 80 is circular as shown in FIG. 6, the filters 51 to 55 are pulled to the lower end of the recess 80, and the arrangement positions (center positions) of the filters 51 to 55 are extremely displaced. On the other hand, there is a problem that the arrangement position (center position) of the filters 51 to 55 cannot be sufficiently shifted. Therefore, as in the recess 90 shown in FIG. 7, the lower end portion may be a horizontal plane 92.

Further, in the above embodiment, an example in which the metal fibers of one of the adjacent filters and the metal fibers of the other filter are parallel, that is, for example, the metal fibers in the longitudinal direction of the filters 51 and 52 are both vertical. Long in the direction (the vertical metal fibers of the filters 51 and 52 are parallel), and the horizontal metal fibers of the filters 51 and 52 are both long in the horizontal direction (the horizontal metal fibers of the filters 51 and 52 are parallel). Although described in the example (see FIG. 6), the present invention is not limited thereto. For example, as shown in FIG. 8, rotation in a plane parallel to the filter so that the metal fiber of one of the adjacent filters 51 and 52 and the metal fiber of the other filter 52 are non-parallel. The positions may be determined and the filters 51 and 52 may be arranged. By doing so, the above-mentioned gap 70 (see FIG. 5) can be efficiently formed.

Here, in the above-described embodiment, the filters 51 to 55 are individually separated and formed in a circular shape. Therefore, without taking special measures such as aligning the rotation positions of the filters 51 to 55 (adjusting the rotation positions in the plane parallel to the filter so that the metal fibers are parallel), the dents (recesses 60, 80) are simply dented. , 90, etc.), the rotation positions of the filters 51 to 55 in the plane parallel to the filter are naturally displaced, and the metal fibers of the filters 51 to 55 become non-parallel. In other words, the above-described embodiment is configured in which the rotation position in a plane parallel to the filter is determined so that the metal fibers are non-parallel. Then, in this way, the metal fibers of the filters 51 to 55 are non-parallel, and in particular, the metal fibers are non-parallel between the adjacent filters, so that the above-mentioned gap 70 (see FIG. 5) is efficiently formed. Will be done.

Note that FIG. 8 shows an example in which the positions of the centers 51c and 52c of the filters 51 and 52 overlap when observed from the direction in which the resin solution flows, but the positions of the centers 51c and 52c are different. , Filters 51 and 52 may be arranged (see FIG. 6). That is, the positions of the centers 51c and 52c may be different as shown in FIG. 6, and the rotation positions may be different as shown in FIG. By doing so, the above-mentioned gap 70 (see FIG. 5) is formed more efficiently.

In the present invention, it is sufficient that the value obtained by multiplying the filter accuracy of one of the adjacent filters by an integer is different from the value of the filter accuracy of the other filter. Therefore, the specific filter accuracy of the filters 51 to 55 is specified. Is not limited to the above-described embodiment, and can be changed as appropriate. However, in order to efficiently form the gap 70 (see FIG. 5) described above, the number of common factors between the accuracy of one of the adjacent filters and the accuracy of the other filter may be small (or nonexistent). preferable. By doing so, the least common multiple of one filter accuracy and the other filter accuracy becomes larger than when the number of common factors is large. This least common multiple corresponds to the distance between the overlapping portions of the metal fibers of adjacent filters when observed from the direction in which the resin solution flows. Therefore, the above-mentioned gap 70 (see FIG. 5) is formed more efficiently when the common factor is small and the least common multiple is large than when the common factor is large and the least common multiple is small.

10 Resin manufacturing equipment 12 Pre-process 14 Post-process 20 Heating stirrer (heating part)
22 Extruder 24 Main body tank 26 Additive tank 30 Cylinder 32 Hopper 34 Screw 36 Rotating shaft 38 Feather 40 Laminated filter 42 Filtration part 51, 52, 53, 54, 55, 100, 101 Filter 51a, 52a, 100a, 101a Metal fiber 51c, 52c Center 60, 80, 90 Indentation 62 Holding frame 70 Gap 72 Aluminum piece 92 Horizontal plane

Claims (3)

In a resin manufacturing apparatus that obtains a resin by removing the metal pieces from a raw material resin containing a metal pieces.
A heating unit that heats the raw material resin to obtain a resin solution,
A filtration unit for filtering the resin solution is provided.
The filtration unit includes a laminated filter formed by arranging a plurality of sheet-shaped filters in which a rectangular mesh is formed by knitting metal fibers vertically and horizontally.
For each filter constituting the laminated filter, when the number of vertical or horizontal metal fibers arranged per unit length is taken as the filter accuracy,
A resin manufacturing apparatus characterized in that a value obtained by multiplying the filter accuracy of one of adjacent filters by an integer is different from the value of the filter accuracy of the other filter. The plurality of filters are arranged in a plane parallel to the filter so that the center position of the one filter and the center position of the other filter are different when observed from the flow direction of the resin solution. The resin manufacturing apparatus according to claim 1, wherein the position is determined and arranged. The plurality of filters are arranged so that the metal fibers of the one filter and the metal fibers of the other filter are not parallel to each other so that the rotation positions in the plane parallel to the filters are determined and arranged. The resin manufacturing apparatus according to claim 1 or 2.

Images