JPH058222A - Manufacture and manufacturing device of premolded product of thermosetting resin molding material - Google Patents

Abstract

PURPOSE:To provide the title method and device whose cost of plant and equipment is inexpensive and handling of cleaning is simple and easy. CONSTITUTION:Two rolls 1 which are formed so that value obtained by dividing a value obtained by deducting the diameter D0 of the lowest depth of the roll 1 from the diameter D of the roll 1 by the diameter D0 of the lowest depth of the roll 1 and multiplying by 100% becomes not exceeding extending % of a molding material where the material is broken are juxtaposed horizontally and in parallel with each other. Both the rollers 1 are tuned in the opposite directions to each other, a thermosetting resin molding material manufactured by a roll infiltrating machine or a kneader is loaded between the rolls 1 and a premolded product of the thermosetting molding material which is in the same form as that of a gap formed between the rolls 1 is manufactured continuously.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for producing a preformed product of a thermosetting resin molding material, and in particular, a reinforcing material or carbonic acid obtained by cutting fibers such as glass fiber or carbon fiber into thermosetting resin. When using a preforming material (called molding material) manufactured by impregnating a filler such as calcium and aluminum hydroxide, a pigment, a curing agent, etc. with a roll impregnation machine or kneading with a kneader for injection molding or compression molding A thermosetting resin molding material that is formed by dividing the molding material taken out from the impregnating machine or kneader into shapes and weights that can be easily supplied to the injection molding machine or compression molding machine (referred to as preformed products). The present invention relates to a manufacturing method and a manufacturing apparatus for the preformed product.

[0002]

2. Description of the Related Art Conventionally, a thermosetting resin, a reinforcing material, a filler, a pigment, a curing agent and the like are weighed in predetermined amounts, and a fibrous reinforcing material is provided in a gap between two rolls rotating in opposite directions. Other than thermosetting resins, fillers, pigments, curing agents, etc. and a liquid mixture (called a paste) and a fibrous reinforcing material are passed through for impregnation, or thermosetting resins, fillers, pigments,
A molding material is manufactured by adding a measured amount of a curing agent and a fibrous reinforcing material to a kneader and kneading.

Then, the molding material thus manufactured by the roll impregnation machine or the kneader is taken out from each manufacturing apparatus, and the molding apparatus is composed of an extruder and a cutter having two screws rotating in opposite directions, and a piston. A preforming product is manufactured by cutting into a certain size and weight by using a molding device composed of an extruder and a cutter.

[0004]

However, the above-mentioned conventional manufacturing method has the following problems. That is, in the manufacturing method using an extruder having a screw, the screw of the extruder is rotated and the fibrous reinforcing material mixed in the molding material, particularly the glass fiber is broken short and the reinforcing effect is significantly reduced. . Therefore, when another extruder having a piston is used to compensate for the drawbacks of the extruder having the screw, continuous extrusion cannot be performed, and thus the extrusion capacity becomes smaller. Further, even if any of these extruders is used, it is difficult to clean at the time of color change and requires a large amount of labor, and if it is intended to increase the production capacity, it becomes a very large production apparatus. Expensive equipment costs are required.

Therefore, the object of the present invention is to solve the above problems in the prior art by preforming products of thermosetting resin molding material which are inexpensive and easy and easy to handle such as cleaning. To provide a manufacturing method and a manufacturing apparatus.

[0006]

In order to achieve the above-mentioned object, according to the present invention, a molding material produced by a roll impregnation machine, a kneader or the like is provided with a gap between two rolls rotating in opposite directions. The shape can be solved by a simple method of shaping by passing between rolls having the same shape as the continuous shape of the preformed product.

Therefore, the method for producing the preformed product of the thermosetting resin molding material according to the present invention is the diameter of the roll (D).
Minus the diameter of the minimum depth of the roll (D ₀ ),
100 (%) divided by the diameter of the minimum depth of the roll (D ₀ ).
The value obtained by multiplying by is the elongation (%) at which the molding material breaks (%). Two rolls formed so as to have a value equal to or less than the value (%) are horizontally and parallelly arranged, and both rollers are rotated in opposite directions. A thermosetting resin molding material produced by a roll impregnator or a kneader is put between the rolls to continuously form a preformed product of the thermosetting molding material having the same shape as the gap formed between the rolls. It is characterized in that it comprises a process of manufacturing the same.

The apparatus for producing a preformed product of a thermosetting resin molding material according to the present invention has a roll diameter (D) minus the minimum depth diameter (D ₀ ) of the roll. The two rolls formed so that the value obtained by dividing by the diameter (D ₀ ) of the minimum depth and multiplying by 100 (%) is less than the elongation (%) at which the molding material breaks (%) are horizontal and parallel. Gaps formed between the rolls by rotating both rollers in opposite directions and inserting a thermosetting resin molding material produced by a roll impregnation machine or a kneader into the space between the rolls. The present invention is characterized in that a preformed product of a thermosetting molding material having the same shape as the above is continuously manufactured.

Other objects, features and advantages of the present invention will become apparent from the detailed description given below with reference to the accompanying drawings.

In the method for producing a preformed product of the thermosetting molding material of the present invention, the shape of the gap between the two rolls used for producing the preformed product has the same shape as the continuous shape of the preformed product. It was done. Therefore, for example, in the case of manufacturing a preformed product such as a flat plate, as shown in FIG. 1 of the drawings, the outer diameter, that is, the diameter is D, and the diameter of the minimum depth is D _0. The book rolls 1, 1 are preferably arranged in the configuration shown via material guide plates 2, 2. Further, in the case of manufacturing a preformed product such as a round bar shape, as shown in FIG. 2, two pieces having a structure in which the outer diameter, that is, the diameter is D ′ and the diameter of the minimum depth is D ′ ₀ are used. The rolls 1 ', 1'are preferably arranged in the configuration shown via material guide plates 2', 2 '.

FIG. 3 of the drawings is a conceptual diagram showing that a molding material A manufactured by a roll impregnation machine, a kneader or the like is manufactured into a preformed product by using two rolls 1 and 1 arranged according to the present invention. , The rolls 1, 1 are rotating in opposite directions in the directions of the arrows. The rotation speeds of the two rolls 1 and 1 may be the same or may be slightly different. Therefore, the molding material A is shaped into an arbitrary shape by the two rolls 1 and 1 that rotate by charging from the rotation direction side of the two rolls 1 and 1 and the preformed product is formed from the side opposite to the charging side. The preformed product guide roll 3 guides the preformed product B onto the belt conveyor 5, the cutter 4 cuts the preformed product B into a predetermined length, and the preformed product B is conveyed by the belt conveyor 5.

Further, as shown in FIG. 4, another two rolls 1 and 1 having a slightly smaller cross-sectional area than the first roll having the same shape as the second roll immediately after being shaped once by the two rolls 1 and 1 are formed. By passing between the rolls 11, 11 via the material guide plate 12, a more completely shaped preformed product is obtained. The direction of arranging the rolls 11 of the second stage is
Although it is not possible to use a flat plate-shaped one, a round bar-shaped or square-shaped one has a second roll direction perpendicular to the first roll axis direction, as shown in FIG. The rolls 1 and 1 of the eye and the rolls 11 and 11 of the second stage may be arranged so that the directions thereof are orthogonal to each other, and they need not necessarily be parallel.

In this case, however, the minimum depth from the roll surface (roll diameter) shown in FIGS. 1 and 2 poses a problem ((roller diameter D or D'-roller minimum depth diameter). D ₀ or D ′ ₀ ) / (roller minimum depth diameter D ₀
Alternatively, the value of D ′ ₀ ) × 100 (%) must be set to be equal to or less than the elongation (%) at which the molding material breaks. Otherwise, the preformed product will not be a continuous preformed product because cracks will be generated from the surface of the preformed product and the preformed product will be cut. In this way, a desired preformed product can be obtained by cutting the continuously formed preformed product into a desired size with a cutter or the like.

[0014]

EXAMPLES Some experimental examples according to the method for producing a preformed product of the thermosetting resin molding material of the present invention will be shown below. Experimental Example 1 Mixing of molding material (1) Unsaturated polyester resin 30% Additive 10% (lubricant, pigment, curing agent, etc.) Filler (calcium carbonate) 35% Glass fiber 25%

A roll impregnator was used to manufacture a molding material having the above composition, and the roll was arranged as shown in FIG. 1 to obtain a roll having a diameter D of 300 mm and a roll having a minimum depth of D ₀ 270 mm.
A plate-shaped preformed product with a thickness of about 30 mm and a width of 400 mm is continuously manufactured by using two chrome-plated rolls with a roll length (L) of 500 mm and a length of the deepened roll (L ₀ ) of 400 mm. Attempts were made to rotate the roll at a rotation speed of 2 revolutions / minute, but after passing through the roll, it broke into pieces and did not become a continuous preformed product. The same was true even though the rotation speed was 1 rotation / minute. The temperature of the molding material at this time is 4
The roll surface temperature was 0 ° C and 40 ° C. Next, the roll diameter D is 600 mm, and the roll minimum depth diameter D ₀ is 57 mm.
0 mm, roll length (L) was 500 mm, length of the deepened roll (L ₀ ) was changed to 400 mm, and rotation speed was 1 rotation / min. A preformed product could be made. At this time, the temperature of the molding material was 40 ° C and the roll surface temperature was 40 ° C. The elongation of the molding material was 10% or less.

The elongation of this molding material was calculated by the following measuring method. A molding material manufactured by a roll impregnator or a kneader is pressed into a prism (hereinafter referred to as a sample) having a square shape with a side of 5 cm and a length of 30 cm. This is placed on a thin elastic plate 22 made of metal or synthetic resin as shown in FIG. At this time, the elastic thin plate 22
Is placed on the flat plate 23 so as not to bend due to the weight of the sample 21. Next, the sample 21 is slid and transferred onto the table 24 whose radius is known in FIG. Next, it is observed whether or not cracks are generated on the B surface of the sample 21, and if no cracks are generated, the table 24 is replaced with one having a small radius and the same procedure is performed. If a crack has occurred, the radius of the platform 24 at the time when the crack occurs is determined in the same manner as in the case where the radius of the platform 24 is large. The time when this crack occurs is defined as elongation according to Equation 1.

[Equation 1]

Experimental Example 2   Mixing of molding material (Part 2) Unsaturated polyester resin 22%                             Additive 6%                                 (Lubricants, pigments, curing agents, etc.)                             Filling agent (calcium carbonate) 57%                             Glass fiber 15%

A kneader of the molding material having the above composition was used in a roll arrangement as shown in FIG. 2 to obtain a roll diameter D'500 mm and a roll minimum depth D' ₀ 440 mm.
Using two chrome-plated rolls with a roll length (L ') of 300 mm and a length of the roll deep (L' ₀ ) of 60 mm, a round bar-shaped preformed product having a diameter of about 60 mm is continuously manufactured. When the rotation speed of the roll was 5 rotations / minute, continuous molding was possible. At this time, the temperature of the molding material was 35 ° C and the surface temperature of the roll was 35 ° C. Next, the roll diameter D'500 mm and the roll minimum depth diameter D' ₀₄
A round bar-shaped preformed product with a diameter of about 80 mm is continuously manufactured using two chrome-plated rolls with a length of 20 mm, a roll length (L ') of 300 mm, and a length of the deepened roll (L' ₀ ) of 80 mm. Attempts were made to rotate the rolls at a rotation speed of 2 revolutions / minute, but after passing through the rolls, the rolls shredded and a continuous preformed product could not be manufactured. At this time, the temperature of the molding material was 35 ° C and the surface temperature of the roll was 35 ° C. The elongation of the molding material was 18% or less.

Experimental Example 3 The mixing of the molding material of Experimental Example 2 (No. 2) was carried out with a roll arrangement as shown in FIG. 2, a roll diameter D'500 mm, a roll minimum depth diameter D' ₀ 420 mm, and a roll length ( L ') 300m
m, the length of the part where the roll surface was deepened (L ' ₀ ) It was attempted to continuously manufacture a round bar-shaped preformed product having a diameter of about 80 mm by using two chrome-plated rolls having a length of 80 mm. Since it has been cut, 2 rolls of the above arrangement
As the stage roll, the first stage roll was arranged on this as shown in FIG. 5, but even if it passed through the second stage roll, it was not a continuous preformed product. At this time, in the first stage, the roll diameter D'500 mm and the roll minimum depth D' ₀₄
A chrome-plated roll having a length of 15 mm, a roll length (L ') of 300 mm, and a length (L' ₀ ) of 85 mm where the roll surface is deep was arranged. At this time, the molding material temperature was 35 ° C., and the roll surface temperature was 35 ° C. in both the first and second stages.

[0020]

As described above, according to the method for producing a preformed product of the thermosetting resin molding material of the present invention, as compared with the conventional extruder having a screw or an extruder having a piston, By keeping the relationship among roll diameter, roll minimum depth diameter, elongation at break of molding material, etc. within the specified range, the equipment cost is low and the production capacity is large, and the production equipment itself has a simple structure. Therefore, it is possible to achieve suitable effects such as cleaning with less labor when changing colors.

[Brief description of drawings]

FIG. 1 is a plan view of a roll configuration for manufacturing a flat plate-shaped preformed product by a manufacturing apparatus for carrying out a method for manufacturing a preformed product of a thermosetting resin molding material according to the present invention.

FIG. 2 is a plan view of a roll structure for manufacturing a round bar-shaped preformed product by the manufacturing method of the present invention.

FIG. 3 is a conceptual diagram of a method for producing a preformed product of the thermosetting resin molded product of the present invention.

[Fig. 4] In manufacturing a flat plate-shaped preformed product,
It is a front view of roll composition arranged in two steps.

[Fig. 5] In manufacturing a round bar-shaped preformed product,
It is a front view of roll composition arranged in two steps.

FIG. 6 is a schematic diagram of a sample placed on a thin elastic plate for measuring elongation.

FIG. 7 is a schematic diagram in which a sample is transferred onto a table having a known radius in measuring elongation.

[Explanation of symbols]

1 Roll 2 Material Guide Plate 3 Preformed Product Guide Roll 4 Cutter 5 Belt Conveyor 11 Roll 12 Material Guide Plate 21 Sample 22 Elastic Thin Plate 23 Flat Plate 24 Platform with Known Radius L, L'Roll Length L ₀ , L' ₀ length of the deepened roll D, D'roll diameter D ₀ , D' ₀ roll minimum depth diameter

Claims (2)

[Claims] [Claim 1] from a roll diameter (D) of the minimum depth of the roll diameter was what subtracting (D _0), is divided by the minimum depth of the roll diameter (D ₀₎ by multiplying 100 (%) The two rolls formed in such a manner that the above value is equal to or less than the elongation (%) at which the molding material breaks are arranged horizontally and in parallel, and both rolls are rotated in opposite directions to each other. In between, a thermosetting resin molding material produced by a roll impregnator or a kneader is put in to continuously form a preformed product of a thermosetting molding material having the same shape as the gap formed between the rolls. A method of manufacturing a preformed product of a thermosetting resin molding material, which comprises a manufacturing process. Wherein the roll diameter (D) of the minimum depth of the roll diameter was what subtracting (D _0), it is divided by the minimum depth of the roll diameter (D ₀₎ by multiplying 100 (%) The two rolls formed so that the value of the roll is equal to or less than the elongation (%) at which the molding material breaks are arranged horizontally and in parallel, and both rolls are rotated in opposite directions. A thermosetting resin molding material manufactured by a roll impregnator or a kneader is put between rolls to continuously form a preformed product of a thermosetting molding material having the same shape as the gap formed between the rolls. An apparatus for producing a preformed product of a thermosetting resin molding material, which is characterized in that