JP4569010B2 - Manufacturing method of injection molding pellets and injection molding pellets - Google Patents

Description

表１に示すように、実施例１の平板状ペレットで作製した試験片よりも、実施例２の丸棒状ペレットで作製した試験片の方が衝撃値が高いことが判る。また、実施例２の方が実施例１よりもＣｖが小さく、各試験片間で衝撃値のバラツキが小さいことが判る。さらに、平均残存繊維長についても、実施例２の方が実施例１よりも長かった。
【００３６】
次に、試験片の色相評価について説明する。色相評価には、日本電色工業（株）社製Ｚ−Σ８０の色差計を使用した。評価基準にはｂ値を用いた。ｂ値は、サンプル（ナイロン）の色が黄色に近くなるにつれて高くなり、青色に近くなるにつれて低くなる。また、真白なプラスチックからなる部材を標準サンプルとして用いた。表２に、評価結果を示す。
【００３７】
【表２】

表２に示すように、実施例１よりも実施例２の方がｂ値が小さく、試験片の劣化が少ないことが判る。これは、実施例１よりも実施例２の方が射出成形機の混練時間が短く、ペレットが加熱される時間が短かったことに起因しているためである。
【００３８】
以上、本発明者らによってなされた発明を実施形態に基づき具体的に説明したが、本発明は上記実施形態に限定されるものではない。例えば、下面用圧接部と上面用圧接部が存在しさえすれば、圧接ロッドは二段に配列する必要はない。例えば、圧接ロッドを一列に配置し、これに沿ってガラス繊維織物をジグザグに搬送させてもよい。この場合、あるロッドの上部が下面用圧接部となり、その隣のロッドの下部が上面用圧接部となる。
【００３９】
また、射出成形用ペレットの製造方法に関する発明においては、ダイの出口は必ずしも断面円形でなくてもよく、長方形状等としてもよい。
【００４０】
さらに、射出成形用ペレットを折り返すにあたって、折り返し角度は９０゜以上あればよい。
【００４１】
また、ガラス繊維織物は平織りに限られず、朱子織り、ななこ織り等の他の如何なる形態でもよい。
【００４２】
【発明の効果】
以上説明したように、本発明に係る射出成形用ペレットの製造方法および射出成形用ペレットによれば、射出成形品の耐衝撃性を高くすることができる。
【図面の簡単な説明】
【図１】ペレット製造装置を示す概略構成図である。
【図２】図１のII-II方向の断面図である。
【図３】ペレット製造装置のドラム近傍の斜視図である。
【図４】ダイの出口の形状を説明するために用いた図である。
【図５】本発明の射出成形用ペレットを示す斜視図である。
【図６】本発明の射出成形用ペレットを射出成形機のホッパからスクリューに導入する際の説明図である。
【符号の説明】
１…射出成形用ペレット、２…ドラム、４…溶融樹脂、６…ダイ、６ａ…ダイの出口、８…冷却部、１０…ペレット製造装置、１２…搬送ローラ、１４…切断部、３０…樹脂槽、３２ａ…圧接ロッド（上側圧接部）、３２ｂ…圧接ロッド（下側圧接部）、３４…樹脂導入口、５２…ホッパ、５４…シリンダ、５６…スクリュー、５６ａ…溝部、５６ｂ…凸部、Ｆ…ガラスフィラメント、Ｌ…ガラス繊維織物、Ｌ₁…経糸、Ｌ₂…緯糸、Ｘ…ガラス繊維織物の搬送方向。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pellet used in an injection molding machine for molding an injection molded product and a method for producing the pellet.
[0002]
[Prior art]
Conventionally, pellets in which a thermoplastic resin is reinforced with glass fibers have been used as an injection molding material. For example, Japanese Patent Application Laid-Open No. 10-146826 discloses a method for manufacturing such a pellet (strengthening body for injection molding). In this method, first, a granular thermoplastic resin is sprayed and supplied onto the surface of the fiber fabric, and then the fiber fabric is passed through a roller press. Heat treatment and cooling treatment are sequentially performed on the fiber fabric by the heating roll and the cooling roll sandwiched from above and below when passing through the roller press, and the thermoplastic resin sprayed on the fiber fabric is solidified. Then, it cut | disconnects with a grinder and a small piece (pellet) about 6 square mm is obtained.
[0003]
[Problems to be solved by the invention]
Incidentally, in recent years, it has been desired for injection molded products to increase the impact strength. However, for example, in an injection molded product using pellets obtained by the manufacturing method described in the above publication, conventional fiber reinforced pellets, or long fiber reinforced pellets using glass roving, etc., an impact resistance sufficient to meet such a demand. I could not get sex.
[0004]
The present invention has been made under such a background, and an object of the present invention is to provide an injection molding pellet that can increase the impact resistance of an injection molded product, and a method for manufacturing the same.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a method for producing pellets used in injection molding, in which a long glass fiber fabric is conveyed in a molten thermoplastic resin inside a resin tank, and during the conveyance. A lower surface pressure contact portion for pressing only the lower surface of the glass fiber fabric, and an upper surface pressure contact portion positioned below the lower surface pressure contact portion and for pressing only the upper surface of the glass fiber fabric. The glass fiber woven fabric is passed through the pressure contact areas provided alternately along the glass fiber fabric, and after passing through the glass fiber fabric through the pressure welded area, the glass fiber woven fabric is cut to form pellets, and the glass fibers that have passed through the pressure welded area. The woven fabric is folded in a direction substantially orthogonal to the conveying direction .
[0006]
According to the pellet for injection molding according to the present invention, when passing through the pressure contact region, the glass fiber fabric is not simultaneously pressed from both the upper and lower sides at a predetermined position during conveyance. It is press-contacted from one side by any one of the press-contact portions. For this reason, in the present invention, air in the glass fiber fabric is more likely to escape to the opposite side of the press contact portion as compared with the case where they are simultaneously pressed from above and below, and the thermoplastic resin is interposed between the filaments of the glass fiber fabric. Is easy to impregnate. As a result, the resulting pellet has less voids and high impact resistance.
[0007]
In the present invention, the pellet for injection molding is not formed by so-called thick count roving, but is formed by a glass fiber fabric formed by weaving fine count warp and weft. For this reason, even if a tensile force for conveyance is applied to the glass fiber fabric, the glass fiber fabric has a force to maintain the woven shape, so the glass fiber fabric is in a direction perpendicular to the conveyance direction. It is hard to stagnate. Thereby, it becomes easy to impregnate a thermoplastic resin between each filament of a glass fiber fabric. Accordingly, the voids of the pellet are further reduced, and the impact resistance is high.
[0008]
Furthermore, since the fiberglass fabric contained in the injection-molded pellets is woven with warps and wefts, and the binding force between the fibers is strong, even if kneaded with a screw of an injection molding machine during injection molding, The crossing point of the (filament bundle) and the glass fiber bundle can be left in the injection molded product. For this reason, the impact resistance of the injection molded product is high.
[0009]
In the method of injection molding pellets of the present invention, a glass fiber fabric which has passed through the pressure contact area is returned folded in a direction substantially perpendicular to the conveying direction.
[0010]
By increasing the fiber length of the glass fiber contained in the injection molded product, the impact resistance of the molded product can be increased. However, the present inventors have found that the following problem arises even if an attempt is made to increase the fiber length of the glass fiber by simply increasing the size in the length direction and the width direction of the pellet. In other words, even when trying to let the pellets enter the cylinder with the screw from the hopper of the injection molding machine by its own weight, injection pellets with large size or injection molding pellets with extremely low bulk density are put into the screw grooves. Becomes unstable and bounces back to the hopper, resulting in inferior pellet conveying efficiency with the screw. As a result, since the metering time of the injection molding machine becomes longer, the kneading time becomes longer, the reinforcing fibers are more easily cut, and the remaining fiber length of the glass fiber in the injection molded product becomes shorter.
[0011]
On the other hand, it can be set as the pellet which is easy to enter a screw groove by folding back a glass fiber fabric like this invention and making the size of the width direction compact. Moreover, since the pellets are folded back, the glass fiber length in the width direction can be increased even if the size in the width direction (direction substantially orthogonal to the transport direction) is small. As a result, the kneading time of the injection molding machine can be shortened, and the glass fiber bundle having a long fiber length originally has a glass fiber bundle. Therefore, the glass fiber bundle having a long fiber length remains in the injection molded product formed from this pellet. As a result, the impact resistance is high.
[0012]
The pellet for injection molding of the present invention is a pellet used for injection molding, has a glass fiber fabric and a thermoplastic resin impregnated therein, and the glass fiber fabric is folded. To do.
[0013]
Since the pellet for injection molding according to the present invention is folded and compacted, as described in the description of the manufacturing method of the present invention, the kneading time of the injection molding machine can be shortened, and the glass fiber length contained Is getting longer. For this reason, the injection molded product molded from the pellets has a glass fiber having a long fiber length, a glass fiber bundle, and an intersection shape of the glass fiber bundle, and has high impact resistance. Further, by expanding the width of the glass fiber fabric or increasing the weave density, a longer glass fiber length can be left, and the impact resistance can be further improved. Furthermore, since the kneading time at the time of injection molding is short as described above, the hue of the appearance of the injection molded product is hardly changed.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, with reference to an accompanying drawing, the manufacturing method of the pellet for injection molding concerning the present invention and the suitable embodiment of the pellet for injection molding are described in detail. In addition, the same code | symbol shall be used for the same element and the overlapping description is abbreviate | omitted.
[0015]
FIG. 1 is a schematic configuration diagram showing a pellet manufacturing apparatus 10 for manufacturing an injection molding pellet (hereinafter, abbreviated as “pellet”) 1 of the present embodiment, and FIG. 2 is a II-II direction of FIG. FIG. The pellet manufacturing apparatus 10 includes a drum 2 around which a long glass fiber fabric L is wound, and a glass fiber fabric L conveyed from the drum 2 and a molten thermoplastic resin such as nylon (hereinafter “molten resin”). Of the glass fiber fabric L impregnated with 4, the die 6 for adjusting the cross-sectional shape of the glass fiber fabric L impregnated with the molten resin 4 and adjusting the amount of the resin, and the glass fiber fabric L defined by the die 6. A cooling unit 8 for cooling the glass fiber fabric L in order to maintain the shape, a transport roller 12 for transporting the glass fiber fabric L in the X direction, and the glass fiber fabric L that has passed through the cooling unit 8 are cut by a cutter. The cutting section 14 for obtaining a plurality of pellets 1 is provided from the upstream (left side in the figure) to the downstream (right side in the figure).
[0016]
FIG. 3 is a perspective view of the vicinity of the drum 2. As clearly shown in this figure, the glass fiber fabric L, which is the reinforcing material of the pellet 1 in this embodiment, is formed by plain weaving a plurality of warps L ₁ and wefts L ₂ . The warp L ₁ is configured so as to be along the conveyance direction (X direction) of the glass fiber fabric L, and the weft L ₂ is along a direction (Y direction) perpendicular thereto. The warp yarn L ₁ and the weft yarn L ₂ are each formed by bundling a plurality of glass filaments with a sizing agent.
[0017]
With reference to FIG.1 and FIG.2 again, the structure of the pellet manufacturing apparatus 10 is demonstrated. The resin tank 30 is formed with a resin inlet 34 for receiving therein the molten resin 4 extruded from an extruder (not shown).
[0018]
The resin tank 30 is provided with a plurality of press contact rods having a diameter of about 3 mm for opening the glass fiber woven fabric L by pressure contact and impregnating the opened glass fiber woven fabric L with the molten resin 4. . The pressure contact rods are provided in two upper and lower stages, and 10 are arranged on each of the upper and lower stages. Each pressure contact rod is positioned and fixed with respect to the housing of the resin tank 30 so as not to move and rotate. And the upper part of the press-contacting rod attached | subjected the code | symbol 32b is made into the press-contact part for lower surfaces for press-contacting only the lower surface (lower side of FIG. 1) of the glass fiber fabric L, The lower part of the roller attached | subjected the code | symbol 32a is a lower surface. The upper surface pressure contact portion is located below the pressure contact portion and presses only the upper surface of the glass fiber fabric. As shown in FIG. 1, the lower surface pressure contact portions and the upper surface pressure contact portions exist alternately along the conveyance direction X of the glass fiber fabric L. The region where the lower surface pressure contact portion and the upper surface pressure contact portion are provided is referred to as a pressure contact region.
[0019]
At the center of the die 6, an outlet 6 a for drawing the glass fiber fabric L toward the cooling unit 8 is formed. The cross-sectional shape of the outlet 6a is circular, and the diameter thereof is shorter than the lateral width (length in the Y direction) of the glass fiber fabric L. Specifically, when the lateral width of the glass fiber fabric L is 5 mm to 50 mm, the diameter of the outlet 6a is preferably about 1 mm to about 5 mm. However, the value of the diameter of the outlet 6a is appropriately set depending on the amount of resin, the type and shape of the glass fiber fabric, and the like. The effect of making the outlet 6a of the die 6 in such a shape will be described later.
[0020]
Next, a method of manufacturing the injection molding pellet 1 by the pellet manufacturing apparatus 10 of the present embodiment will be described.
[0021]
First, the molten resin 4 is introduced from the resin introduction port 34 into the resin tank 30 by an extruder or the like so that the molten resin 4 reaches the pressure contact rods 32a and 32b. Next, the conveying roller 12 is driven, the glass fiber fabric L wound around the drum 2 is pulled out, and conveyance of the pressure contact area is started.
[0022]
The glass fiber fabric L is conveyed in a zigzag manner while in contact with the press rods 32a and 32b in the press contact region in order. At this time, the lower surface of the pressure contact rod 32b is pressed against the lower surface of the glass fiber fabric L by the tensile force of the conveying roller 12, and the molten resin 4 is impregnated therein. Further, the upper surface of the glass fiber fabric L is pressed in the press-contact portion for the upper side of the press-contact rod 32a, and the molten resin 4 is impregnated therein. That is, the glass fiber fabric L is not pressed simultaneously from both the upper and lower sides during conveyance, but is pressed from one side by either the lower surface pressure contact portion or the upper surface pressure contact portion.
[0023]
After the molten resin 4 is impregnated in the resin tank 30, the glass fiber fabric L is drawn out from the outlet 6 a having a circular cross section of the die 6. At this time, as shown in FIG. 4 when the die 6 is viewed from the cooling unit 8 side, the glass fiber fabric L is folded in a direction (Y direction) substantially orthogonal to the transport direction X along the inner peripheral surface of the outlet 6a. It is.
[0024]
And after the glass fiber fabric L pulled out from the exit 6a is solidified with the shape in the cooling part 8, it is cut | disconnected by predetermined | prescribed length by the cutting part 14, and the pellet 1 shown in FIG. 5 is completed. Although the length of the pellet 1 depends on the dimensions of the injection molding machine to be used, it is preferably about 3 mm to 25 mm, and more preferably about 7 to 12 mm.
[0025]
Here, in the present embodiment, as described above, when the glass fiber fabric L is impregnated with the molten resin 4 in the resin tank 30, the pressure is alternately pressed from the upper side or the lower side. Therefore, in the present embodiment, as compared with the case up and down from as pressed simultaneously, the air of the glass fiber fabric in L tends to run away on the opposite side of the press contact portion, the warp L ₁ and the weft of the glass fiber woven fabric L The molten resin 4 is easily impregnated between the L ₂ filaments. Thereby, the obtained pellet 1 has less voids and has high impact resistance.
[0026]
In the present embodiment, the pellet 1 is not formed by so-called roving but is formed of a glass fiber fabric L formed by weaving warp L ₁ and weft L ₂ . For this reason, even if the tensile force of the conveyance roller 12 is applied to the glass fiber fabric L, the glass fiber fabric L has a force to maintain the woven shape. It is hard to be constricted in a direction (Y direction) orthogonal to the direction. Thereby, the molten resin 4 is easily impregnated between the filaments of the warp L ₁ and the weft L ₂ of the glass fiber fabric L. Therefore, the voids of the pellet 1 are further reduced and the impact resistance is high.
[0027]
With reference to FIG. 6, the further effect of this embodiment is demonstrated. FIG. 6 is a view showing a part of an injection molding machine that performs injection molding using the pellets 1. In the figure, a hopper 52 to which the pellet 1 is supplied, a cylinder 54, and a screw 56 rotatably mounted in the cylinder 54 are shown. The screw 56 has a spiral convex portion 56b formed around the groove portion 56a. In performing injection molding under such a configuration, the pellet 1 is fed from the hopper 52 into the groove 56 a of the screw 56, and the pellet 1 is kneaded as the screw 56 rotates. Here, in this embodiment, since the glass fiber fabric L contained in the pellet 1 is woven with warps L ₁ and wefts L _{2 to} increase the binding force between the fibers, the fiber 56 is kneaded with a screw 56 during injection molding. Even if it is done, the glass fiber woven fabric contained in the injection-molded product tends to keep the woven shape. For this reason, the impact resistance of the molded product is high.
[0028]
Further, for example, when the size in the length direction and the width direction of the plate-like pellet is increased, it is rebounded to the hopper 52 by the edge portion of the convex portion 56b of the screw 56, and it is quite easy to find a gap between the convex portion and the convex portion. It cannot enter into the groove part 56a. As a result, the metering time of the injection molding machine becomes longer and the kneading time becomes longer, so that the pellets are easily cut accordingly, and the remaining fiber length of the glass fiber in the molded product becomes shorter. On the other hand, the pellet 1 is the groove part 56a between the convex part of the screw 56 by folding back the glass fiber fabric L like this embodiment, and making the size of the width direction (Y direction) compact. Get into the smooth. Moreover, since the pellet 1 is folded, the glass fiber length in the width direction is long even if the size in the width direction (Y direction) is small. In other words, since the metering time of the injection molding machine is shortened, the kneading time can be shortened, and the length of the glass fiber contained therein is long. Therefore, the injection molded product molded from the pellet 1 is a glass having a long fiber length. The fibers remain, and the impact resistance is high.
[0029]
In particular, the length of the weft L ₂ existing in the lateral direction (Y direction) of the pellet 1 is larger than the length of the pellet 1 corresponding to the cutter interval of the cutting portion 14 by increasing the width of the glass fiber fabric L. Can be long. That is, in the conventional LFP (long fiber pellet), the cutting length by the cutter is the fiber length in the pellet, whereas in this embodiment, fibers longer than the cutting length can be included in the injection molded product. . Moreover, the ratio and length of the glass fiber of a horizontal direction can be freely adjusted by changing the width | variety and the weave density of the glass fiber fabric L. FIG.
[0030]
【Example】
Next, the present invention will be described more specifically based on examples. In this example, the impact value and the hue were evaluated.
[0031]
First, a glass cloth tape was impregnated with a thermoplastic resin while being pressed with a rod in a resin tank in the vertical direction, and after cooling, it was cut with a cutter to produce a pellet. Moreover, two types of pellets were produced by mounting two types of dies having different exit dimensions in a resin tank. Below, the preparation conditions of a pellet are shown.
<Materials used>
Glass cloth tape (glass fiber fabric)
Product name: Nittobo TEA13 plain weave type tape Dimensions: width 13mm x thickness 0.10mm
Tape weave density: Vertical 28 / 25mm, Weft 38 / 25mm
Product name of thermoplastic resin: Amilan, nylon-6 (manufactured by Toray)
Variety: CM1007
<Resin tank>
Number of rods: 9 (Glass cloth tape was conveyed while crossing each rod up and down)
Die exit:
Example 1
Cross-sectional shape: rectangular cross-sectional dimension: width 14 mm x clearance 0.3 mm
(Example 2)
Sectional shape: Circular sectional dimension: Diameter 2.35 mm
<Pellets>
Example 1
Shape: Flat plate Dimensions: Thickness 0.25mm x Width 12mm x Length 10mm
Glass content: about 43% by weight
(Example 2)
Shape: Round bar (folded)
Dimensions: 3mm diameter (outer diameter) x 10mm length
Glass content: about 30% by weight
The pellet of Example 1 is formed using a die having a rectangular outlet shape, and the pellet of Example 2 is formed using a die having a circular outlet shape. The pellet of Example 2 was folded back in a direction perpendicular to the conveying direction when passing through a die having a circular cross section, thereby forming a round bar shape.
[0032]
Next, injection molding was performed using the two types of pellets obtained as described above, to prepare test pieces. The conditions for injection molding and the dimensions of the test specimens produced are as follows.
Injection molding machine: Nissei Plastic Industry Co., Ltd. -PS60E9ANE
Molding temperature: 260 ° C
Mold temperature: 80 ℃
Injection pressure: 40 kg / cm ²
Specimen size: Thickness 12.7 mm x width 3.4 mm x length 64.0 mm
(No notch)
[0033]
And the Izod impact test (it applies to JIS K 7110) was done using the obtained test piece. The impact experiment was performed under the following conditions.
Capacity: 150kgf · cm
Hammer lifting angle: 150 ° Testing machine name: Izod impact testing machine Toyo Seiki Co., Ltd. [0034]
Table 1 shows the evaluation results of the impact test. In addition, about glass content and an impact value, the average value about five test pieces is shown, and about an average residual fiber length, the average value of 1000 fibers is shown.
[0035]
[Table 1]

As shown in Table 1, it can be seen that the test piece made of the round bar-shaped pellet of Example 2 has a higher impact value than the test piece made of the flat pellet of Example 1. In addition, it can be seen that Example 2 has a smaller Cv than Example 1, and the variation in impact value is smaller between the test pieces. Further, the average remaining fiber length of Example 2 was longer than that of Example 1.
[0036]
Next, the hue evaluation of the test piece will be described. For the hue evaluation, a color difference meter Z-Σ80 manufactured by Nippon Denshoku Industries Co., Ltd. was used. The b value was used as the evaluation standard. The b value increases as the color of the sample (nylon) approaches yellow, and decreases as it approaches blue. A member made of pure white plastic was used as a standard sample. Table 2 shows the evaluation results.
[0037]
[Table 2]

As shown in Table 2, it can be seen that the b value is smaller in Example 2 than in Example 1 and the test piece is less deteriorated. This is because the kneading time of the injection molding machine was shorter in Example 2 than in Example 1, and the time for heating the pellets was shorter.
[0038]
As mentioned above, although the invention made by the present inventors has been specifically described based on the embodiment, the present invention is not limited to the above embodiment. For example, the press contact rods do not need to be arranged in two stages as long as the press contact portion for the lower surface and the press contact portion for the upper surface exist. For example, the pressure contact rods may be arranged in a row, and the glass fiber fabric may be zigzag conveyed along the rods. In this case, the upper part of a certain rod is the lower surface pressure contact part, and the lower part of the adjacent rod is the upper surface pressure contact part.
[0039]
Further, in the invention relating to the method for manufacturing the pellet for injection molding, the outlet of the die does not necessarily have a circular cross section, and may have a rectangular shape or the like.
[0040]
Further, when folding the injection molding pellet, the folding angle may be 90 ° or more.
[0041]
Further, the glass fiber fabric is not limited to a plain weave, and may be any other form such as a satin weave or a nanako weave.
[0042]
【The invention's effect】
As described above, according to the injection molding pellet manufacturing method and the injection molding pellet according to the present invention, the impact resistance of the injection molded product can be increased.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram showing a pellet manufacturing apparatus.
FIG. 2 is a cross-sectional view in the II-II direction of FIG.
FIG. 3 is a perspective view of the vicinity of a drum of a pellet manufacturing apparatus.
FIG. 4 is a diagram used for explaining the shape of the outlet of the die.
FIG. 5 is a perspective view showing an injection molding pellet of the present invention.
FIG. 6 is an explanatory diagram when the pellet for injection molding of the present invention is introduced from a hopper of an injection molding machine into a screw.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Injection molding pellet, 2 ... Drum, 4 ... Molten resin, 6 ... Die, 6a ... Die exit, 8 ... Cooling part, 10 ... Pellet manufacturing apparatus, 12 ... Conveyance roller, 14 ... Cutting part, 30 ... Resin Tank, 32a ... pressure contact rod (upper pressure contact portion), 32b ... pressure contact rod (lower pressure contact portion), 34 ... resin introduction port, 52 ... hopper, 54 ... cylinder, 56 ... screw, 56a ... groove portion, 56b ... convex portion, F ... glass filaments, L ... glass fiber fabric, L ₁ ... warp, L ₂ ... weft, X ... conveying direction of the glass fiber fabric.

Claims (2)

In the manufacturing method of pellets used for injection molding,
While transporting the long glass fiber fabric through the molten thermoplastic resin inside the resin tank,
During the conveyance, a lower surface pressure contact portion for pressing only the lower surface of the glass fiber fabric, and an upper surface pressure contact for positioning only the upper surface of the glass fiber fabric while being positioned below the lower surface pressure contact portion. And the glass fiber woven fabric is passed through the pressure contact area provided alternately along the conveying direction,
After passing the glass fiber fabric through the pressure contact region, the glass fiber fabric is cut to form a pellet ,
The method for producing pellets for injection molding , wherein the glass fiber fabric that has passed through the pressure contact region is folded back in a direction substantially orthogonal to the transport direction . Pellets used for injection molding,
Having a glass fiber fabric and a thermoplastic resin impregnated therein,
A pellet for injection molding, wherein the glass fiber fabric is folded.

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