JPH05177632A - Preparation of sheet for stamp forming - Google Patents

Abstract

PURPOSE:To prepare a sheet for stamp forming which gives a formed product with a good forming property and a high strength and easy for recycling by supplying a thermoplastic resin and a reinforcing material between a pair of an upper and a lower rotary belts to be heat-pressed between them, and supplying the reinforcing material in the form of a tape which is impregnated with the thermoplastic resin. CONSTITUTION:Belts 2, 3 are rotated, forming a transfer passage separated at a specified distance. A tape-formed reinforcing material of roving, etc., impregnated with a thermoplastic resin is cut in the length of 0.5-30cm, and the cut frbers 8 are supplied at least on the one surface of the belts. The thermoplastic resin 11 and the reinforcing material 12 are supplied between rollers 2, 3. An appropriate reinforcing material is CM produced by cutting a glass fiber bundle. A heater 15 is installed close to the inlet of the transfer passage 6, while a cooler is placed near the outlet of it. The reinforcing material 12, thermoplastic resin 11, and cut fibers 8 which are supplied between the belts 2, 3 are heated to impregnate the reinforcing material with a molted resin, thus affording a sheet for stamp forming.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a stamp forming sheet.

[0002]

2. Description of the Related Art A sheet obtained by impregnating a reinforcing material such as a glass fiber mat with a thermoplastic resin is subjected to a stamping method to form an F sheet.
It is widely used as a molding material (sheet for stamp molding) for producing RTP. In addition, a sheet made of glass fiber is often used as the reinforcing fiber. As the reinforcing material, CSM in which long glass fiber bundles are deposited in a loop shape or CM in which cut pieces (CS) of glass fiber bundles are deposited are widely used. CSM,
In order to improve the handling property of CM, it is also known to add a mat binder or perform needling to give the mat shape retention. As a method for manufacturing a stamp-forming sheet, a moving path is formed by a pair of upper and lower belts that horizontally rotate with a predetermined gap, and a thermoplastic resin and a reinforcing material are supplied between the belts and sandwiched by the belts. A method (belt method) is known in which the reinforcing material is impregnated with the reinforcing material by moving the material under pressure while heating the material near the inlet of the moving passage and cooling it near the outlet. In order to obtain a FRTP molded product having high strength, continuous fibers aligned in the longitudinal direction are used together.

[0003]

The prior art has the following problems. Recently, recycling has begun to save resources and prevent pollution. As a method for recycling the FRTP molded product, there are a method of heating and melting the molded product and re-stamping as it is (first method), and a method of crushing the molded product once and reusing it (second method). Although conceivable, these methods have the following problems. First method The continuous fibers arranged in the longitudinal direction impede the fluidity of the sheet when re-stamping, and the continuous fibers are displaced, turned up or crossed during re-stamping, and re-stamped. It significantly deteriorates the appearance and performance of the molded product obtained by. Second Method FRTP molded products using long continuous fibers are extremely difficult to grind.

As a result of repeated studies to solve the above-mentioned problems, the present inventor has obtained a plurality of tape-shaped reinforcing members having a reinforcing material impregnated with a thermoplastic resin and having a length of 0.5 to 30 cm. It was found that extremely suitable results can be obtained by using a stamp-forming sheet characterized by being laminated on at least one surface of a composite sheet composed of a thermoplastic resin and a reinforcing material along the longitudinal direction. , Filed a patent application. The present invention (hereinafter referred to as a prior invention sheet) has an object to provide an industrial production method for producing a prior invention sheet by using a belt method.

[0005]

In the present invention, in order to achieve the above object, a moving passage is formed by a pair of upper and lower belts which horizontally rotate with a predetermined gap, and a thermoplastic passage is formed between the belts. While supplying the resin and the reinforcing material while moving them while pressing them with the belt, the reinforcing material is impregnated with the thermoplastic resin by heating near the inlet of the moving passage and cooling near the outlet to form the stamp forming sheet. In the manufacturing method, a stamp-forming sheet is manufactured by supplying a tape-shaped reinforcing material obtained by impregnating a reinforcing member with a thermoplastic resin onto a belt in front of a passage.

Next, the present invention will be described more specifically.
As a reinforcing member for obtaining the tape-shaped reinforcing material 1, it is suitable to use a glass fiber bundle obtained by adding and focusing a sizing agent to glass fibers. As a glass fiber, the average diameter is 6 to 2
Those having a thickness of 5 μm, preferably 9 to 20 μm can be preferably used. The number of bundles of glass fibers and the Tex of glass fiber bundles, ie, the number of gr per 1,000 m, are 5 respectively.
The number is preferably 0 to 50,000, 10 to 60,000, and more preferably 50 to 10,000, and 10 to 12,000. The amount of sizing agent added is 0.05-
It is suitable to be 1.5 wt%, preferably 0.1 to 1.0 wt%. As the thermoplastic resin with which the reinforcing member is impregnated, it is preferable to use the same thermoplastic resin as described later in terms of recycling. PE, PP, PET, PB
T, NY, PPS, etc. are illustrated.

There is no particular limitation on the method of impregnating the reinforcing member with the thermoplastic resin. For example, a reinforcing material such as roving is continuously passed through the molten thermoplastic resin, and is pressed by a roll to heat the material. It is possible to obtain the flat tape-shaped reinforcing material 1 in which the plastic resin is uniformly impregnated. Regarding the amount of the thermoplastic resin added to the reinforcing member, the weight of the reinforcing member is 10 to 80 wt of the total amount of the reinforcing member and the thermoplastic resin.
%, And the thickness and width of the tape-shaped reinforcing member 1 are 0.02 to 0.02, respectively.
2 mm, 1 to 50 mm, preferably 0.03 to 1 mm,
It is suitable to set it to 1 to 30 mm.

The belts 2 and 3 are provided with a pair of guide rolls 4 and 4, respectively.
4; 5 and 5 are supported, and are horizontally rotated in the direction of the arrow with a predetermined gap therebetween to form a moving passage 6 extending horizontally between the belts. Reference numeral 7 is a pressing roll for pressing the thermoplastic resin and the reinforcing material supplied into the passage 6 as described later.

The tape-like reinforcing material 1 is cut into a length of 0.5 to 30 cm, preferably 1 to 10 cm, and the cut product 8
Is supplied to at least one surface of the belts 2 and 3 before the passage 6. In addition, 9 is a cutter for cutting the tape-shaped reinforcing material 1. The cut objects 8 may be arranged so that there is no space in the width direction, or they may be arranged so as to have a slight space in the width direction. The position of the cut 10 in the longitudinal direction of the cut objects 8 is preferably arranged so as to be slightly offset from the cut 10 of the cut objects 2 that are adjacent to each other in parallel. The cut object 8 is heated by the heated belt, adheres to the belt, and is drawn into the passage 6 together with the reinforcing material 12 described later. In addition,
The cut object 8 may be supplied to the upper surface of the upper belt 2, or the lower belt 3 may be formed longer than the upper belt 2 and supplied to the vicinity of the entrance of the lower belt 3.

A thermoplastic resin 11 and a reinforcing material 12 are supplied between the belts 2 and 3. As the reinforcing material 12, a glass fiber having an average diameter of 6 to 25 μm, preferably 9 to 20 μm, and a film forming agent such as a polyolefin emulsion is used in an amount of 1 to 10 wt%, preferably 2 to 6 wt%, and a nonionic surfactant is used. 0.05 to 1.5 wt% of various lubricants,
Desirably, a sizing agent containing 0.1 to 1 wt% and a coupling agent such as aminosilane in an amount of 0.05 to 1.5 wt%, preferably 0.1 to 1 wt% is used as a solid component of 0.
1 to 1.5% by weight, preferably 0.2 to 1% by weight, 50 to 8,000, preferably 80 to 4,000
Tex, ie, the weight (gr) per 1,000 m formed by the main focusing, is 10 to 1,000, preferably 15 to 5,000.
A CM consisting of a 00 cut glass fiber bundle (CS) is suitable. Further, the length of CS is 3 to 1,000 mm, preferably 6 to 300 mm, and the weight per 1 m ^{2 of} CM is 10.
˜2,000 gr, preferably 50 to 1,000 gr can be preferably used.

The kind of thermoplastic resin supplied together with the reinforcing material is not particularly limited, and PE, PP, PET, PBT, N
Y, PPS, etc. are illustrated. The amount of the thermoplastic resin is 1 weight of the reinforcing material to the total weight of the reinforcing material and the thermoplastic resin.
It is appropriate to set it to be 0 to 70 wt%, preferably 20 to 50 wt%. The thermoplastic resin 11 may be supplied as a melt, powder or granules using the supply device 13, or may be supplied as a film.

The moving passage 6 is provided with a heating device 15 near the inlet 14 of the moving passage and a cooling device 17 near the outlet 16. An electric heater or an inductive heating device can be used as the heating device, and a cooling roll or the like can be used as the cooling device. The reinforcing material 12, the thermoplastic resin 11, and the cut material 8 supplied between the belts 2 and 3 move in the direction of the arrow in the movement path by the rotation of the belt while being pressed by the belts 2 and 3. During this time, the thermoplastic resin is heated by the heating device, melted and softened to be impregnated into the reinforcing material, and cooled by the cooling device to obtain the stamp forming sheet 18.

[0013]

Operation: A pair of upper and lower belts that rotate horizontally with a predetermined gap form a moving path, and a thermoplastic resin and a reinforcing material are supplied between the belts to move the belt while pressing it with the belt. Reinforcing tape-like reinforcement by impregnating a reinforcing member with a thermoplastic resin when manufacturing a stamp molding sheet by impregnating the reinforcing resin with a thermoplastic resin by heating near the inlet of the passage and cooling near the outlet By supplying the material onto the belt in front of the passage, it is possible to industrially obtain a stamp-forming sheet having good moldability, high strength, and an easily recyclable FRTP molded article.

[0014]

EXAMPLE A sizing agent of 0.5 wt% was added to glass fiber having an average diameter of 13 μm as a solid component, and 6,400 strands of Tex 2,200 formed by concentrating 6,400 strands were added with 33 parts of PP by 33 parts by weight. A part of the tape-shaped reinforcing material having a thickness of 0.5 mm and a width of about 12 mm was obtained by pressing with a roll at 200 ° C. A passage having a thickness (upper and lower gap) of 4 mm and a length of 500 cmm is formed between a pair of horizontally rotating belts, the vicinity of the inlet of the passage is heated to 200 ° C, and the vicinity of the outlet is cooled to 50 ° C. did. On the upper surface of the belt 2, cut products obtained by cutting the tape-like reinforcing material into a length of 5 cm were supplied so that the gap between the cuts was 1 mm and the gap in the width direction was 1 mm. A glass fiber having a diameter of 13 μm and a sizing agent as a solid component was added at 0.5 wt% and bundled with Tex575.
Between ^two sheets of 0 gr / m ² CM, PP with a thickness of 1.6 mm
The thickness of the film is 0.8mm above and below the CM.
A sheet for stamp molding was obtained by stacking the PP films of 1 above and supplying them between the belts. This sheet had good moldability, and the FRTP molded product obtained using this sheet had high strength and was easy to recycle.

[0015]

INDUSTRIAL APPLICABILITY A FRTP molded product having good moldability, high strength, and easy recycling can be industrially obtained.

[0016]

[Brief description of drawings]

FIG. 1 is a front view for explaining a method of the present invention.

FIG. 2 is a plan view of a stamp forming sheet obtained by the method of the present invention.

FIG. 3 is a plan view of a stamp forming sheet obtained by the method of the present invention.

[Explanation of symbols]

 1 Tape Reinforcement Material 2 Belt 3 Belt 4 Induction Roll 5 Induction Roll 6 Moving Passage 7 Pressing Roll 8 Cut Material 9 Cutter 10 Break 11 Thermoplastic Resin 12 Reinforcement Material 13 Supply Device 14 Inlet 15 Heating Device 16 Outlet 17 Cooling Device 18 Stamp Molding sheet

Claims (1)

[Claims] 1. A moving path is formed by a pair of upper and lower belts that rotate horizontally with a predetermined gap therebetween, and a thermoplastic resin and a reinforcing material are supplied between the belts to move the belt while compressing the belt. In a method of manufacturing a stamp forming sheet in which a reinforcing material is impregnated with a thermoplastic resin by heating near the entrance of the moving passage and cooling near the exit, tape-like reinforcement obtained by impregnating the reinforcing member with the thermoplastic resin A method for manufacturing a stamp forming sheet, characterized in that the material is supplied onto a belt before the passage.