JP2006137068A - Method for molding molten thermoplastic resin - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for molding a molten thermoplastic resin which can press-mold the resin easily and inexpensively without the deterioration and insufficient strength of an obtained molding when numbers of the moldings are produced simultaneously. <P>SOLUTION: The molten thermoplastic resin supplied from a melting device is deaerated and molded into a continuous body having a prescribed cross-sectional shape. The molten thermoplastic resin in the shape of the continuous body is supplied continuously to a cutting device in which two or more cutting blades are formed at the same intervals and which has a length measuring device. When the length of the continuous body supplied to the cutting device becomes a prescribed length, the cutting blades are actuated simultaneously, and the continuous body is cut simultaneously into pieces of the same shape. The continuous body of each molten thermoplastic resin or the piece is kept to be melted from a melting machine to a press. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  In the present invention, when a plurality of molded articles are simultaneously obtained with a plurality of press machines or a multi-cavity cooling press machine, the melt is melted in the same state or weight at the same time. The present invention relates to a method of measuring and dividing into the same number of thermoplastic resin melt pieces as the press mold.

  Conventionally, as a method for obtaining a thermoplastic resin melt, one or more types of chip-shaped plastic materials obtained by pulverizing a plastic material made of the recovered thermoplastic resin with a pulverizer, waste paper, rubber waste, fiber, wood powder Dissimilar waste materials such as wood and wood, and foreign materials in the form of strips and powders are supplied to the mixing machine, and the mixing machine stirs and mixes the material in the chamber with the high-speed rotation of the stirring blades, and the resin is generated by internal friction heat. A method of melting and mixing a molten thermoplastic resin and a different material to form a molding material in a melt-mixed state is known. (For example, refer to Patent Document 1).

  In the above method, a predetermined amount of the molding material obtained in the melt mixed state is supplied into the molding die of the molding apparatus while maintaining the molten state, and the molding material is cooled and press molded to obtain a molded product. However, the molding material melted by the above method is in a state in which a large amount of bubbles are unevenly contained therein. Therefore, if a predetermined amount of the molding material is supplied to the molding die as it is and press-molded, the resulting molded product contains voids therein, which causes a decrease in strength of the molded product.

  Therefore, the mold is filled with an amount of the molding material containing the bubbles of a predetermined shape or weight, the mold is lightly closed, the molding material is heated until it reaches a molten state, and then the pressure and pressure of the molding mold are reduced. A method of repeatedly degassing, or a method of once charging the molding material containing bubbles into an extruder and eliminating the bubbles to obtain a melt having a constant cross-sectional shape or weight is employed.

  However, if the degassing operation is performed in the molding die, it is necessary to heat the molding die so as to keep the molding material in a molten state during the degassing operation. In addition, when the extruded melt is put into a cooling press, the surface will cool and solidify if it is exposed to the outside air for a long time, or it will contact the mold unless it is pressed immediately after being put into the press mold. The part is cooled and solidified. When a melt partly cooled and solidified as described above is press-molded, the surface of the resulting molded body becomes rough, resulting in a large thickness variation of the molded body, resulting in a product with non-uniform physical properties. In particular, in the case of a multi-cavity press having a plurality of press dies, it is important to press in the same state as possible.

  On the other hand, the molding material brought into the melt-mixed state in the mixing and melting step must be divided into a lump of a predetermined shape or weight before being supplied to the molding die and supplied to the molding die. In the case of producing a large number of molded bodies at the same time, a plurality of thermoplastic resin melts must be weighed and divided at the same time. It cools and becomes a solid state from a semi-solid.

Therefore, it is necessary to reheat the molding material supplied into the mold. In this case, the extraneous material in the molding material, in particular, wood powder or wood fragments, is further heated and carbonized, etc. There is a possibility that the molded product to be discolored or the strength is lowered. In addition, the molding die must be a heating die for remelting the molding material, and there is a problem that the molding die structure is complicated and expensive.
JP-A-11-226956

  An object of the present invention is to provide a method for molding a thermoplastic resin melt that can be easily and inexpensively press-molded, and at the same time, when producing a large number of molded products, there is no deterioration or insufficient strength of the molded product obtained. It was made.

  The method of molding a thermoplastic resin melt according to claim 1 (invention 1) is to melt molten thermoplastic resin into a plurality of molding dies and press while cooling to obtain a plurality of molded products simultaneously. In the molding method of the product, the thermoplastic resin melt supplied from the melting device is degassed and shaped into a continuous body having a predetermined cross-sectional shape, and the thermoplastic resin melt having the continuous body shape is divided into a plurality of cutting blades. Are continuously supplied to a cutting device provided with the same distance and provided with a length measuring device. When the length of the continuous body supplied to the cutting device reaches a predetermined length, a plurality of cutting blades are operated simultaneously. The continuous body is cut into a plurality of pieces of the same shape at the same time, and each thermoplastic resin melt continuous body or piece is kept in a molten state from the melting machine to the pressing device. Features.

  The method of molding a thermoplastic resin melt according to claim 2 (invention 2) is to melt molten thermoplastic resin into a plurality of molding dies and press while cooling to obtain a plurality of molded products simultaneously. In the molding method of the product, the thermoplastic resin melt supplied from the melting device is degassed and shaped into a continuous body having a predetermined cross-sectional shape, and the thermoplastic resin melt having the continuous body shape is divided into a plurality of cutting blades. Are continuously supplied to a cutting device provided with the same interval and equipped with a weight measuring device, and when the continuous body supplied to the cutting device reaches a predetermined weight, a plurality of cutting blades are simultaneously operated to The body is cut into a plurality of pieces of the same weight at the same time, and each thermoplastic resin melt continuum or piece is melted from the melter to the press machine.

  The invention of claim 3 (invention 3) is constituted by a plurality of small moving devices in which the moving devices of the cutting device are arranged in series, and the continuous body supplied from the upstream side of the moving device is cut into individual pieces. Then, the moving speed of the downstream small moving device is faster than the moving speed of the upstream small moving device.

  The invention according to claim 4 (invention 4) is obtained by causing the thermoplastic resin melt to collide with the blade rotating at high speed in the chamber and melting the thermoplastic resin with the generated frictional heat. The method for molding a thermoplastic resin melt according to any one of Inventions 1 to 3, wherein

  The invention according to claim 5 (invention 5) is the molding of the thermoplastic resin melt according to any one of inventions 1 to 4, wherein the thermoplastic resin melt comprises a plurality of thermoplastic resins having different melting temperatures. Is the method.

  The invention of claim 6 (invention 6) is that the thermoplastic resin melt is added to 100 parts by weight of the melted thermoplastic resin, and the crushed plant pieces, the crushed pieces, the cut pieces, the plant fibers, or the threshing residues 50 to 200 weights. A method for molding a thermoplastic resin melt according to invention 5, wherein the parts are mixed.

  The thermoplastic resin in Invention 1 to Invention 6 is not particularly limited as long as it is a general thermoplastic resin. For example, polyethylene, polypropylene, vinyl chloride resin, polyvinylidene chloride, polystyrene, polybutadiene, polybutene, polyvinyl acetate, Examples include acrylic resins, cellulose acetate resins, and ABS resins that include a plurality of resins and elastomer resins.

  This resin is melted by, for example, introducing a thermoplastic resin as a raw material into the chamber of the melt mixer described in Patent Document 1, rotating the stirring blade at a high speed, stirring, and melting the thermoplastic resin by internal frictional heat. In the method of forming the molding material in a state, a large amount of air remains in the melt. If the resin in this state is press-molded as it is, residual air remains as voids and nests in the molded product, and the strength of the molded product decreases and the appearance deteriorates. Therefore, when this is press-molded, it is deaerated beforehand.

  Degassing methods include melting with a general kneading and melting machine such as an extruder and removing the air contained in the raw material with the pressure at the time of kneading and melting, filling the amount of molding material containing bubbles and mold Close the lightly and heat the molding material until it reaches a molten state, then repeatedly pressurize and depressurize the molding die to deaerate, or use a thermoplastic resin melt containing air to separate the gaps between the rolls. Are sequentially passed between a plurality of narrowed roll pairs, and the thermoplastic resin melt is alternately compressed by the roll pair and reduced pressure until reaching the next roll pair from the roll pair. There is a method of performing multi-stage deaeration by acting on, and it is only necessary to appropriately deaerate according to the situation.

  When the deaeration is performed with a plurality of pairs of rolls, the molten thermoplastic resin can be simultaneously rolled. Therefore, the molten thermoplastic resin melt that has exited the last pair of rolls is preferable because it is completely degassed and continuously formed into a continuous body such as a sheet shape.

  In order to prevent the thermoplastic resin melt compressed by the roll pair from spreading laterally, a weir plate, guide plate or guide roll having a predetermined width is placed between the faces of the opposing roll pair or between the roll pair and the next roll pair. It is advantageous to insert the material into the material and restrict the movement of the thermoplastic resin in the width direction because the cross-sectional shape of the continuum is further determined.

  In addition, since the roll pair only needs to exhibit the effect of degassing the thermoplastic resin melt and shaping it into a continuous body, one roll may be used as a conveyor instead of the roll pair. Then, the continuous body of the thermoplastic resin melt deaerated more smoothly can be moved.

  Moreover, the thickness of the continuous body shape TD cross section of a thermoplastic resin melt is not specifically limited, However, 3-10 cm is preferable for shaping | molding in the following process. When wood powder or the like is added, carbonization of the wood powder due to internal heat generation can be prevented by setting the thickness to 7 cm or less.

  In the invention 1, the thermoplastic resin melt in the form of the continuous body is supplied to a cutting device in which a plurality of cutting blades are provided at the same interval, and the continuous body supplied on the cutting device has a predetermined length. When the leading edge of the continuous body comes to a predetermined position, the plurality of cutting blades are simultaneously operated to simultaneously cut the continuous body into a plurality of pieces having the same shape.

  The cutting device includes a moving device for moving a continuous body thereon, a cutting device for cutting a thermoplastic resin having a predetermined cross-sectional shape that has been degassed, and measuring the tip position of the continuous body. And a length measuring device. In the moving device, as in the third aspect, a plurality of small moving devices may be arranged in series, and the continuum supplied to the cutting device sequentially moves on each small moving device.

  The cutting device is provided with a plurality of cutting blades at equal intervals. As the cutting blade, a shearing knife type blade that is usually disposed above a continuous body placed on a moving device is often used. The cutting blade is configured to receive a signal issued when the length measuring device detects that the continuous body has a predetermined length, and simultaneously cuts the continuous body. Therefore, the cutting blade is preferably cut while moving in synchronization with the moving speed of the sheet. However, if the cutting blade has a fast vertical movement or a continuous moving speed is slow, it does not necessarily move. There is a good case.

  A length measuring device is provided above the end of the moving device of the cutting device. When the leading end of the continuous body reaches the terminal position of the moving device, the length measuring device detects the end, and the continuous body is cut by the previous cutting blade.

  The individual pieces of the cut thermoplastic resin melt are measured for their final weight using a weight measuring device or the like, if necessary, and supplied to a molding die as the next step. Since the thermoplastic resin melt is supplied as a continuous body, it is preferable that the measured value of each individual piece after cutting is fed back to the measured value at the time of cutting the next lot.

  The piece of thermoplastic resin melt that leaves the cutting device and is supplied to the molding die must be in a state of being reliably melted. It is necessary that the temperature of the device in contact with the atmosphere and the atmospheric temperature are heated to the melting temperature of the thermoplastic resin or higher.

  That is, it is necessary that the thermoplastic resin melt is kept in a molten state at least from the melting device to the cutting device outlet. Furthermore, it is necessary that the melted state continues until the individual cut pieces are supplied to the molding die and the cooling press is started at a predetermined position of the press.

  Therefore, for example, when the deaeration is performed with a roll pair, it is preferable that the roll is a heated roll or the moving device of the cutting device is a heated conveyor. Furthermore, it is better that a heat insulating cover or the like is provided to cover all the steps. In addition, a heating roll or a heating conveyor should just be heated by arbitrary heat sources, such as electric heating, oil heating, or steam heating, and is not specifically limited.

  The thermoplastic resin melt cut to a constant weight is supplied into the mold and has already been degassed, so that the desired molded product can be obtained simply by pressing it.

  According to the second aspect of the present invention, when cutting into individual pieces, the weight of the continuous body placed on the moving device of the cutting device is measured and cut when the weight reaches a predetermined weight. Therefore, a weight measuring device is incorporated in each moving device. Specifically, a general-purpose weighing conveyor may be used.

  In this case, only the measurement item of the cutting device and the measurement device are different from the first aspect, and the others are the same. Therefore, the continuum cutting procedure and the atmospheric temperature of the process are the same, and therefore will not be described repeatedly.

  In the invention 3, the continuous body moving device is constituted by a plurality of individual small moving devices arranged in series, and the moving speed of the downstream small moving device is faster than the moving speed of the upstream small moving device. Has been. Accordingly, since the interval between the individual pieces cut on the continuous body moving device is increased after cutting, rejoining of the cut pieces of the melt is prevented. Accordingly, an accurate amount is supplied to the press mold. Of course, it is necessary to keep the thermoplastic resin melt in a molten state from the melting device to the cutting device outlet and further to press molding as described above.

  The moving speed of each small moving device is changed at the same time as the operation of the cutting device is completed. That is, the cutting device operates in response to a signal from the length measuring device or the weight measuring device, but the moving speed of the small moving device also changes the rotational speed of the drive motor of each small moving device using the signal. Or the speed ratio may be automatically changed, and the method is not particularly limited.

  Invention 4 is obtained by melting the thermoplastic resin by the frictional heat generated by causing the thermoplastic resin melt to collide with the blade rotating at high speed in the chamber.

  The method of melting this thermoplastic resin is the same method as in Patent Document 1, and blending of thermoplastic resins having different melting temperatures and kneading of a plant filler containing moisture is easy. However, the resulting molten thermoplastic resin mixture becomes a lump containing non-uniform bubbles. Therefore, for example, by deaeration through a pair of rolls or through an extruder for deaeration, the deaerated thermoplastic resin is molded into a sheet shape, It is desirable to use this method.

  In invention 5, the thermoplastic resin melt comprises a plurality of thermoplastic resins having different melting temperatures. In the above melting method, the resins are melted by frictional heat caused by the collision of the resins. Therefore, when a plurality of resins having different melting temperatures are added, the resin in the actual molten state preferentially generates heat. Therefore, a resin having a low melting temperature is difficult to be thermally decomposed as compared with an external superheating type melting method.

  Invention 6 is a mixture of 100 parts by weight of a melted thermoplastic resin with 50 parts by weight to 200 parts by weight of plant crushed pieces, crushed pieces, cut pieces, plant fibers, or threshing residues. Is. In the above melting method, since the melting chamber is not normally sealed, that is, in an open state, it is easy to release steam generated from plant pieces such as pulverized wood or bamboo or a cut body to the atmosphere. Therefore, there is little need to adjust the moisture content by drying and timbering the wood or the like in advance.

  If the obtained thermoplastic resin melt is left in the form of a lump, the lump inside accumulates heat, and dehydration of the plant pieces proceeds to cause carbonization, or heat generation due to carbonization may cause further carbonization. Therefore, if the thermoplastic resin melt is shaped into a sheet and the surface area is increased, heat generation does not easily proceed inside the lump and carbonization of wood or the like can be suppressed.

  In the invention 1, since the thermoplastic resin melt supplied from the melting apparatus is degassed and shaped into a continuous body having a predetermined cross-sectional shape, the continuous thermoplastic resin melt is cut into a plurality of cuts. When the blades are supplied to a cutting device provided with the same interval and provided with a length measuring device, and the length of the continuous body supplied to the cutting device reaches a predetermined length, a plurality of cutting blades are operated simultaneously. The continuous body can be simultaneously cut into a plurality of pieces having the same shape. If this individual piece is filled in a plurality of molding dies, placed in a pressurizing device of a cooling press device and cooled and pressed, a molded product having a constant strength can be obtained simultaneously.

  And since the thermoplastic resin melt is always in a molten state from the melting machine to the pressing device, there is no need to heat again at the time of pressing, so that the pressing device can be simplified. At the same time, since the thermoplastic resin has little thermal history, a molded product without deterioration can be produced at low cost.

  In the invention 2, the continuous body of the thermoplastic resin melt is cut by weight measurement. If the cross-sectional area of the continuum in the TD direction is the same at any position in the MD direction of the continuum, each piece becomes a piece having a predetermined weight. Therefore, this piece is filled into a plurality of molding dies and cooled. If it is placed in the pressure device of the apparatus and cooled and pressed, a molded product having a constant strength can be obtained at the same time.

  And since the thermoplastic resin melt is always in a molten state from the melting machine to the pressing device, there is no need to heat again at the time of pressing, so that the pressing device can be simplified. At the same time, since the thermoplastic resin has little heat history, it is possible to manufacture molded products without deterioration at low cost.

  In invention 3, the continuous body supplied from the upstream side of the cutting device is placed on the continuous body moving device, and the moving device is constituted by a plurality of small moving devices arranged in series, and the continuous body is cut into individual pieces. Later, the moving speed of the small moving device on the downstream side is used to be faster than the moving speed of the small moving device on the upstream side. Therefore, since the interval between the individual pieces cut on the continuous body moving device is widened after cutting, rejoining of the pieces of the cut melt is prevented, so that an accurate amount can be applied to the press mold. Supplied.

  In the invention 4, the thermoplastic resin melt is obtained by causing the thermoplastic resin to collide with a blade rotating at high speed in the chamber and melting the thermoplastic resin with the generated frictional heat. Blends of resins having different melting temperatures and kneading of plant fillers containing moisture are easy. However, since the obtained thermoplastic resin melt becomes a lump containing non-uniform bubbles, it is preferably molded by applying any one of the methods described in Inventions 1 to 3 for degassing and metering.

  In invention 5, the thermoplastic resin melt is composed of a plurality of thermoplastic resins having different melting temperatures. In the method of melting by frictional heat due to resin collision, when a plurality of resins having different melting temperatures are charged, the resin in the actual molten state preferentially generates heat. Therefore, a resin having a low melting temperature is difficult to be thermally decomposed as compared with an external superheating type melting method.

  In invention 6, the thermoplastic resin melt is a mixture of 100 parts by weight of melted thermoplastic resin with 50 to 200 parts by weight of plant crushed pieces, pulverized pieces, cut pieces, plant fibers, or threshing residues. It is. The method of melting with frictional heat due to resin collision is performed in an open state, so it is easy to release steam generated from plant pieces such as wood, bamboo, or cuttings to the atmosphere. There is no need to perform drying, and degassing in the molding method of the present invention is easy and reliable.

  Furthermore, when the obtained thermoplastic resin melt is left in the form of a lump, dehydration of the plant material piece proceeds in the lump, and heat generation and carbonization occur. However, by forming this into a continuous body having a predetermined cross-sectional shape, it is difficult for internal heat generation to proceed, and carbonization can be suppressed. In addition, by adding the plant material, the reinforcing effect and wood texture of the obtained molded product can be obtained by the shape of the material and the fibers of the material.

  Next, the present invention will be described with reference to the drawings. FIG. 1 is a process diagram showing an example of the molding method of the first aspect. FIG. 2 is a process diagram showing an example of the forming method of the second aspect. FIG. 3 is a process diagram showing an example of a metric division process in the molding method of the invention 3. FIG. 4 is a cross-sectional view of an example of a thermoplastic resin melt mixing apparatus.

  In FIG. 1, the thermoplastic resin melted by the melting device 1 is deaerated, shaped into a continuous body having a predetermined cross-sectional shape, supplied to the cutting device 2 and metered and divided. The melting apparatus 1 may be a general extruder that melts and extrudes a thermoplastic resin and can be degassed at the same time, and is preferably one in which an extrusion screw is temperature-controlled. However, when other materials such as plant materials are mixed with the thermoplastic resin (for example, Invention 6), the thermoplastic resin is melted by frictional heat as shown in FIG. It is preferable to use a melt mixing device for mixing the materials.

  The method for shaping the thermoplastic resin melt into a continuous shape is not particularly limited, but for example, a method for shaping by passing between a plurality of heated pairs of rolls arranged with a predetermined clearance (not shown). ) And the like. When the thermoplastic resin is melted with an extrusion and degassing device, it is already degassed, so a degassing step is not required before shaping, but when melted with a melt mixing device or the like, its thermoplasticity Since the resin melt contains a large number of bubbles, any method that allows the resin melt to pass between a pair of rolls is advantageous because it can be degassed at the same time as forming into a continuous body such as a sheet shape.

  The cutting device 2 includes a plurality of cutting blades 21 such as a plurality of shearing cutters arranged at equal intervals above a heated conveyor 23 on which a continuous body P of thermoplastic resin melt is placed from an upstream end thereof. When the end position of the continuous body P is detected by the non-contact type length sensor 22 arranged on the downstream side of the transport conveyor 23, the cutting blade 21 is simultaneously operated to turn the continuous body P into individual pieces P1, Cut simultaneously to P2,.

  When the cutting device 2 is entirely covered with a heat insulating cover (not shown), the atmosphere of the metering division process can be maintained at a temperature at which the thermoplastic resin can be kept in a molten state. Since the cutting edge 21 hits the cutting edge 21 when the cutting blade 21 cuts the continuous body P simultaneously with heating, the conveyor 23 is preferably made of a material that can withstand this, for example, a metal mesh or plate material such as iron or stainless steel. In many cases, it is coated with an elastic material such as rubber or synthetic resin.

  The method of operating the cutting blade 21 is not particularly limited. For example, as an example, the detection signal of the non-contact type length sensor 22 is received and, for example, the support stay supporting the cutting blade support stay is supported at the same time. The method of opening is mentioned (not shown).

  The conveyance conveyor 23 should just be made into the state which can be made to contact the heating rolls 231, 232, etc. by electricity, steam, etc., and can be made into the state which can maintain the molten state of a thermoplastic resin melt. Furthermore, it is preferable to cover the entire process with a heat insulating cover or the like.

  The individual pieces P1, P2,... Cut by the cutting device 2 have the same cross-sectional shape of the continuous body P, so that the individual pieces P1, P2,. The individual pieces P1, P2,... Are distributed to the individual molding dies 311, 312,..., Moved to the press device 3, and arranged at predetermined positions on the press device 3.

  The pressing device 3 is configured such that a plurality of single-pressing devices 321, 322,..., A multiple-forming molding device 331, etc. are appropriately combined to obtain a large number of press-formed products at the same time. Therefore, the individual molding dies 311, 312,... Are moved and arranged at predetermined pressure platen positions of the respective pressing devices.

  · Preheat the molds 311, 312, ··· and extend the heat insulation cover of the cutting device 2 (metering division) so that the molten pieces P1, P2, ··· do not cool during movement It is better to cover the moving path of continuums and individual pieces. In this way, since all the processes from the melting apparatus 1 to the pressing apparatus 3 are in the melting temperature atmosphere of the thermoplastic resin, the heat history received by the molten resin is only required once, and it is possible to prevent deterioration.

  In FIG. 2, the thermoplastic resin melted by the melting device 1 is deaerated, shaped into a continuous body P having a predetermined cross-sectional shape, supplied to the cutting device 4 and metered and divided. In the cutting device 4, for example, a plurality of cutting blades 41 such as a shearing cutter are arranged at equal intervals above a heated weighing conveyor 43 with a weight sensor 42, and the sheet P placed on the weighing conveyor 43 by the weight sensor 42. When the weight is detected, the cutting blade 21 is operated simultaneously to cut the continuous body P into individual pieces P1, P2,.

  The weighing conveyor 43 is a weighing conveyor 43 provided with a general weight sensor 42, and is not limited to the one provided with a heating device. As a heating method, a method of heating the conveyor surface with a heat roll heated with electricity or steam is often used.

  The temperature from the melting device 1 to the cutting device 2 up to the pressing device 3 is the same as that of the first invention and is not shown in the same manner. The operation of the cutting blade 41 may be the same as in the case of the invention 1 except that the operation of the cutting blade 41 is based on the signal of the weight sensor 42.

  3, the conveyor 53 of the cutting device 5 is divided into a plurality of individual conveyors 531, 532,. The continuum P is placed on the conveyor 53 and is cut evenly when it reaches a predetermined length or weight. After cutting, the cutting blade 51 is separated from the continuum P and then adjacent pieces. Sometimes they come in contact again. In the cutting device 5 of FIG. 3, after the continuous body cutting, the conveyance speed of the individual conveyor (for example, 535) on the outlet side is sequentially higher than the conveyance speed of the individual conveyor (for example, 531) on the inlet side of the cutting device 5. Has been. Accordingly, the individual pieces P1, P2,... After being cut become wider with respect to each other, and are not rejoined.

  Therefore, the length of the individual conveyors 531, 532,... Is preferably at least less than twice the length of each piece P1, P2,. If it is longer than this, the two pieces after cutting may be simultaneously placed on the individual conveyor, and the interval between the pieces may not be increased.

  Although the method of changing the moving speed of the individual conveyors 531, 532,... Is not particularly limited, for example, as an example, the voltage or current of an electric motor or the like that drives each conveyor 531, 532,. The method of changing with the signal which operates the cutting blade 51 from No. etc. is mentioned.

  Even in this case, it is the same as the invention 1 that the temperature from the melting device 1 to the cutting device 2 is covered and the press device 3 is kept warm.

  FIG. 4 is a cross-sectional view of an example of a thermoplastic resin melt mixing apparatus. The thermoplastic resin introduced into the hopper 61 and sent to the chamber 63 by the screw 62 and the other raw materials are generated by the thermoplastic resin introduced into the chamber 63 colliding with each other by the blades 64 rotating at high speed in the chamber 63. The thermoplastic resin is melted by frictional heat. The melted thermoplastic resin mixed with other raw materials is sent from the outlet 65 to the next process. Therefore, although the melt contains a large amount of air, since the melt mixing is performed in an open atmosphere, even if there is some moisture in the plant raw material that is added at the same time, the moisture will come out of the melt. There is no need to adjust the water content in the raw materials.

  The thermoplastic resin may be used by mixing a plurality of thermoplastic resins having different melting temperatures. With respect to 100 parts by weight of the molten thermoplastic resin, the plant crushed pieces, the crushed pieces, the cut pieces, You may mix and use a vegetable fiber or 50-200 weight part of threshing residues. In either case, the thermoplastic resin may be put into the chamber 63 at the same time and mixed at the same time as the resin is melted to obtain a thermoplastic resin melt.

  In the case of using a melt obtained by melting and mixing such a plant raw material, the degassing method includes a plurality of melting and degassing extruders in order to reduce damage to fibers and the like. A method of passing between roll pairs is often used preferably.

It is process drawing which shows an example of the shaping | molding method of invention. It is process drawing which shows an example of the shaping | molding method of the invention 2. It is process drawing which shows an example of the measurement division | segmentation process in the shaping | molding method of the invention 3. It is sectional drawing of an example of the melt mixing apparatus of a thermoplastic resin.

Explanation of symbols

1 Melting device 2 Cutting device (with length sensor)
DESCRIPTION OF SYMBOLS 21 Cutting blade 22 Length sensor 23 Conveyor 231,232, ... Heating roll 3 Press device 311, 312, ... Molding die 321, 322, ... One-piece press device 331 Multi-piece press device 4 Cutting device (With weight sensor)
41 Cutting blade 42 Weight sensor 43 Conveyor 5 Cutting device (split conveyor type)
51 Cutting blade 52 Length sensor or weight sensor 53 Conveyor conveyor 531, 532,... Individual conveyor 6 Melt mixing device 61 Hopper 62 Screw 63 Chamber 64 Stirring blade 65 Outlet P Continuous shape thermoplastic resin melt P1, P2, ..Each piece cut

Claims (6)

In a method for molding a thermoplastic resin melt, a plurality of molding dies are filled with molten thermoplastic resin, and pressed while cooling to obtain a plurality of molded products simultaneously.
The thermoplastic resin melt supplied from the melting device is degassed to form a continuous body having a predetermined cross-sectional shape, and the continuous body-shaped thermoplastic resin melt is provided with a plurality of cutting blades at the same interval. In addition, when the length of the continuous body supplied to the cutting device reaches a predetermined length, a plurality of cutting blades are simultaneously operated to supply the continuous body to the cutting device including the length measuring device. The thermoplastic resin is characterized in that it is cut into a plurality of pieces of the same shape at the same time, and a continuous or individual piece of each thermoplastic resin melt is kept in a molten state from the melting machine to the pressing device. Melt forming method. In a method for molding a thermoplastic resin melt, a plurality of molding dies are filled with molten thermoplastic resin, and pressed while cooling to obtain a plurality of molded products simultaneously.
The thermoplastic resin melt supplied from the melting device is degassed to form a continuous body having a predetermined cross-sectional shape, and the continuous body-shaped thermoplastic resin melt is provided with a plurality of cutting blades at the same interval. In addition, when the continuous body supplied to the cutting device reaches a predetermined weight, a plurality of cutting blades are operated simultaneously, and the continuous body is simultaneously A method for molding a thermoplastic resin melt, wherein the thermoplastic resin melt is cut into individual pieces having the same weight, and a continuous body or individual piece of each thermoplastic resin melt is kept in a molten state from a melting machine to a press device. .   The moving device of the cutting device is constituted by a plurality of small moving devices arranged in series, and after the continuous body supplied from the upstream side of the moving device is cut into individual pieces, the moving speed of the small moving device on the downstream side 3. The method for molding a thermoplastic resin melt according to claim 1, wherein the speed is higher than a moving speed of the upstream small moving device.   The thermoplastic resin melt is obtained by causing a thermoplastic resin to collide with a blade rotating at high speed in a chamber and melting the thermoplastic resin with generated frictional heat. The method for molding a thermoplastic resin melt according to claim 3.   The thermoplastic resin melt molding method according to any one of claims 1 to 4, wherein the thermoplastic resin melt comprises a plurality of thermoplastic resins having different melting temperatures. The thermoplastic resin melt is obtained by mixing 100 parts by weight of a melted thermoplastic resin with 50 to 200 parts by weight of plant crushed pieces, crushed pieces, same cut pieces, plant fibers, or threshing residues. The method for molding a thermoplastic resin melt according to claim 5.

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