JP6222733B2 - Molding apparatus and molding method - Google Patents

Description

  The present invention relates to a technique for molding a resin molded product by sandwiching a molten resin sheet with a mold and clamping the mold.

  Conventionally, as a method for molding a resin molded product, a molten resin sheet extruded from an extrusion apparatus is suspended between divided molds, and the resin sheet is clamped with a divided mold and blown or vacuum molded. (For example, refer to Patent Document 1 and Patent Document 2). In this method, since the molten resin sheet extruded from the extrusion device is placed between the molds and clamped, there are problems such as heating non-uniformity caused by reheating the resin. It is possible to easily mold a resin molded product without causing the above.

Japanese Patent No. 4902789 JP2013-49186A

  When the resin sheet is clamped with a split mold, burrs are generated above and below the split mold. In Patent Documents 1 and 2, the upper and lower burrs are cut after the resin molded product in a total burr state with burrs generated on the upper and lower sides of the divided mold is taken out from the divided mold.

  However, depending on the state of burrs generated above and below the split mold, when the resin molded product in the total burr state is removed from the split mold, the burrs may adhere to the resin molded product or the resin molded product may be deformed. May end up. This is because, for example, if the burr is large, the burr is easily deformed and the burr may adhere to the resin molded product. Further, if the burr is heavy, the load on the resin molded product due to the burr increases, and the resin molded product is easily deformed.

  As a result, as in Patent Documents 1 and 2, if the burr is cut after taking out the resin molded product from the divided mold, depending on the state of at least one burr generated above and below the divided mold, a desired The case where a resin molded product cannot be molded will occur.

  An object of the present invention is to make it easy to mold a desired resin molded product regardless of the state of at least one burr generated above and below the mold.

A molding apparatus according to one aspect of the present invention includes:
A molding apparatus for molding a resin molded product by clamping a mold by sandwiching a molten resin sheet extruded from an extrusion apparatus with a mold,
Cutting at least one burr generated above and below the mold when the mold is clamped and the resin molded product formed inside the mold in a state where the mold is clamped Having a cutting part,
The cutting portion has a press plate for sandwiching the burr,
By moving the presser plate, the burrs are cut and the burrs cut in a state of being clamped by the presser plate are moved,
The presser plate is provided above and below the mold,
A first presser plate which is provided on the mold and cuts the upper burr generated on the mold and the resin molded product;
A lower burr provided under the mold and generated under the mold and a second presser plate for cutting the resin molded product;
The lower burr, the resin molded product, and the upper burr are provided in this order, and control means is provided for dropping onto a conveying means provided below the mold .

  According to the present invention, a desired resin molded product can be easily molded regardless of the state of at least one burr generated above and below the mold.

It is a figure which shows the structural example of the shaping | molding apparatus 100 of this embodiment. FIG. 3 is a first diagram illustrating a configuration example of a pair of adjustment rollers 30 that configure the stretching device 10. FIG. 4 is a second diagram illustrating a configuration example of a pair of adjustment rollers 30 that configure the stretching device 10. FIG. 4 is a diagram illustrating an operation example of the stretching apparatus 10. It is the 1st figure which shows the operation example of the mold clamping apparatus 14, and is a figure which shows the state which has arrange | positioned the resin sheets P1 and P2. It is the 2nd figure which shows the operation example of the mold clamping apparatus 14, and is a figure which shows the state which clamped metal mold | die 32A, 32B. FIG. 10 is a third diagram illustrating an operation example of the mold clamping device 14 and is a diagram illustrating a state in which a presser-side presser plate 33A is advanced. FIG. 10 is a fourth diagram illustrating an operation example of the mold clamping device 14 and is a diagram illustrating a state in which the burrs 2 and 3 are cut by advancing the pressing plate 33B on the cutting side. FIG. 10 is a fifth diagram illustrating an operation example of the mold clamping device 14 and is a diagram illustrating a state in which the lower burr 3 is dropped. It is a 6th figure which shows the operation example of the mold clamping apparatus 14, and is a figure which shows the state which dropped the resin molded product. It is a 7th figure which shows the operation example of the mold clamping apparatus 14, and is a figure which shows the state which dropped one of the upper burrs. FIG. 10 is an eighth diagram illustrating an operation example of the mold clamping device 14 and is a diagram illustrating a state in which the upper burr 2 is dropped. It is a figure which shows the other structural example of the shaping | molding apparatus.

(Outline of molding apparatus 100 according to one embodiment of the present invention)
First, a molding apparatus 100 according to an aspect of the present invention will be described with reference to FIGS. 1 and 8. FIG. 1 shows a configuration example of a molding apparatus 100 according to an aspect of the present invention, and FIG. 8 shows burrs 2 and 3 generated above and below the molds 32A and 32B and the molds 32A and 32B. The resin molded product 1 is shown in a cut state.

  As shown in FIG. 1, a molding apparatus 100 according to an aspect of the present invention molds a resin molded product by sandwiching a molten resin sheet P extruded from an extrusion apparatus 12 between molds 32A and 32B and clamping the mold. It is the shaping | molding apparatus 100 to do.

  As shown in FIG. 8, the molding apparatus 100 according to one aspect of the present invention includes at least one burr 2, 3 generated above and below the molds 32 A, 32 B when the molds 32 A, 32 B are clamped, It has the cutting part which cut | disconnects the resin molded product 1 formed in the inside of type | mold 32A, 32B in the state which clamped metal mold | die 32A, 32B, It is characterized by the above-mentioned. For example, as shown in FIG. 1 and FIG. 8, the cutting part is composed of presser plates 33 </ b> A and 33 </ b> B, presser plate moving devices 34 </ b> A and 34 </ b> B, and a cutting blade 35.

  The molding apparatus 100 according to one aspect of the present invention includes at least one of burrs 2 and 3 generated above and below the molds 32A and 32B and a resin molded product 1 formed inside the molds 32A and 32B. The molds 32A and 32B are cut at the cutting portion with the molds clamped. For this reason, the desired resin molded product 1 can be easily molded regardless of the state of at least one burr 2, 3 generated above and below the molds 32 </ b> A, 32 </ b> B. Hereinafter, embodiments of a molding apparatus 100 according to an aspect of the present invention will be described in detail with reference to the accompanying drawings.

<Configuration Example of Molding Apparatus 100>
First, a configuration example of the molding apparatus 100 of the present embodiment will be described with reference to FIG. FIG. 1 is a diagram illustrating a configuration example of a molding apparatus 100 according to the present embodiment.

  The molding apparatus 100 according to this embodiment includes an extrusion apparatus 12, a stretching apparatus 10, and a mold clamping apparatus 14.

  The molding apparatus 100 of the present embodiment pushes the molten resin sheet P downward from the extrusion apparatus 12. Then, the molten resin sheet P extruded from the extrusion device 12 is stretched by the stretching device 10 and sent to the mold clamping device 14. And the resin sheet P sent out from the extending | stretching apparatus 10 is clamped with the mold clamping apparatus 14, and the resin molded product of a desired shape is shape | molded.

  The extrusion device 12 of this embodiment includes a cylinder 18 provided with a hopper 16, a screw (not shown) provided in the cylinder 18, a hydraulic motor 20 connected to the screw, and an accumulator 22 that communicates with the cylinder 18. The plunger 24 and the T-die 28 are provided in the accumulator 22. The T die 28 is provided with an extrusion slit 26.

  When extruding the molten resin sheet P from the extrusion device 12 of the present embodiment, first, resin pellets constituting the resin sheet P are put into the hopper 16. The resin pellets introduced from the hopper 16 are melted and kneaded by the rotation of the screw by the hydraulic motor 20 in the cylinder 18, and the molten resin is transferred to the accumulator 22 and stored in a certain amount. Then, the molten resin is fed toward the T die 28 by driving the plunger 24, and a continuous resin sheet P having a predetermined length is extruded through the extrusion slit 26. Thereby, the molten resin sheet P can be extruded from the extrusion device 12.

The extrusion capability of the extrusion device 12 is appropriately selected from the viewpoint of the size of the resin molded product to be molded, the draw-down of the resin sheet P, or the prevention of neck-in occurrence. More specifically, the extrusion amount of one shot in intermittent extrusion is preferably 1 to 10 kg, and the extrusion rate of the resin sheet P from the extrusion slit 26 is several hundred kg / hour or more, more preferably 700 kg / hour. It's over time. Further, from the viewpoint of preventing the resin sheet P from being drawn down or neck-in from occurring, the resin sheet P is preferably extruded as short as possible. In general, the extrusion process should be completed within 40 seconds, more preferably within 10 to 20 seconds, depending on the type of resin, MFR value, and melt tension value. For this reason, the unit area and the amount of extrusion per unit time from the extrusion slit 26 of the resin sheet P are 50 kg / hour cm ² or more, more preferably 150 kg / hour cm ² or more.

  As shown in FIG. 1, the extrusion slit 26 is arranged vertically downward, and the resin sheet P extruded from the extrusion slit 26 is sent vertically downward in a form that hangs down from the extrusion slit 26 as it is. The extrusion slit 26 can change the thickness of the resin sheet P by making the interval variable.

  The stretching device 10 stretches the molten resin sheet P extruded from the extrusion slit 26. The stretching apparatus 10 according to the present embodiment includes a pair of adjustment rollers 30A and 30B and an auxiliary roller 31. The pair of adjustment rollers 30A and 30B is disposed at a predetermined position below the T die 28, and the auxiliary roller 31 is disposed at a predetermined position below one roller 30B constituting the pair of adjustment rollers 30A and 30B. ing.

  The pair of adjusting rollers 30A and 30B of the present embodiment is configured such that one roller 30B is intentionally easier to wind the resin sheet P than the other roller 30A. And the auxiliary roller 31 is arrange | positioned in the predetermined position under one roller 30B where the resin sheet P is easy to wind up intentionally. The auxiliary roller 31 is provided to peel the resin sheet to be wound around the one roller 30B from the one roller 30B.

  The stretching apparatus 10 of the present embodiment sandwiches the resin sheet P extruded from the extrusion slit 26 between the pair of adjustment rollers 30A and 30B, and sends the resin sheet P downward by the rotation of the pair of adjustment rollers 30A and 30B. Thus, the resin sheet P is stretched and thinned.

  The stretching apparatus 10 of the present embodiment adjusts the relationship between the extrusion speed of the resin sheet P extruded from the extrusion slit 26 and the delivery speed of the resin sheet P by the pair of adjustment rollers 30A and 30B, thereby drawing down or Occurrence of neck-in can be prevented. As a result, the restriction on the type of resin, in particular, the MFR value and the melt tension value, or the extrusion amount per unit time can be reduced.

  As shown in FIGS. 2 and 3, the pair of adjusting rollers 30A and 30B includes a driving roller 30A and a driven roller 30B, and the rotation shafts of the rollers 30A and 30B are below the extrusion slit 26, respectively. They are arranged almost horizontally in parallel to each other.

  The diameter of each roller 30A, 30B constituting the pair of adjusting rollers 30A, 30B and the axial length of the roller are the extrusion speed of the resin sheet P, the length and width of the resin sheet P in the extrusion direction, and the type of resin. It sets up suitably according to etc. However, in the stretching device 10 of the present embodiment, it is preferable that the diameter of the driven roller 30B is larger than the diameter of the driving roller 30A from the viewpoint of intentionally easily winding the resin sheet P around the driven roller 30B. By making the diameter of the driven roller 30B larger than the diameter of the driving roller 30A, the contact area with the resin sheet P can be made larger on the driven roller 30B side than the driving roller 30A. As a result, the resin sheet P can be easily wound around the driven roller 30B side rather than the driving roller 30A.

  In addition, as a suitable method for making the resin sheet P easier to wind around the driven roller 30B side than the driving roller 30A, a method of making the surface roughness of the driving roller 30A rougher than the surface roughness of the driven roller 30B is adopted. Is preferred. By making the surface roughness of the driving roller 30A rougher than the surface roughness of the driven roller 30B, the area of contact with the resin sheet P can be made larger on the driven roller 30B side than the driving roller 30A. As a result, the resin sheet P can be easily wound around the driven roller 30B side rather than the driving roller 30A. In order to make the roughness of the surface of the driving roller 30A rougher than the surface roughness of the driven roller 30B, the surface of the driving roller 30A is processed using a grainy shot, and the surface of the driven roller 30B is shot with fine particles. This can be realized by surface processing using

  In this embodiment, aluminum alloy A7075 is used as the roller material of the pair of adjustment rollers 30A and 30B. For the shot, White Morundum / WA (grinding material) (manufactured by Showa Denko) is used. The coarser ones use F24-36 (particle size range 710-500 μm) abrasive, and the finer particles use F100-120 (particle size range 125-100 μm) abrasive. Thereby, the surface roughness of the driving roller 30A is made rougher than the surface roughness of the driven roller 30B, and the resin sheet P is intentionally easily wound around the driven roller 30B side rather than the driving roller 30A.

  Conventionally, shots used for surface processing of the driving roller 30A and the driven roller 30B are of the same type so that the resin sheet P is not wound around the pair of adjusting rollers 30A and 30B. However, depending on various conditions such as the type of resin of the resin sheet P, the force that sandwiches the resin sheet P between the pair of adjustment rollers 30A and 30B, and the distance between the pair of adjustment rollers 30A and 30B, the resin sheet P is a pair of adjustment rollers. The phenomenon of winding around either 30A or 30B roller has occurred.

  For this reason, in this embodiment, the driving roller 30A performs surface processing using a shot with coarse particles, and the driven roller 30B performs surface processing using a shot sufficiently finer than the driving roller 30A to drive the resin sheet P. The roller 30A is intentionally more easily wound around the driven roller 30B side. Then, the resin sheet P to be wound around the driven roller 30B by the rotation of the auxiliary roller 31 is peeled off from the driven roller 30B. Thereby, in this embodiment, generation | occurrence | production of the phenomenon that the resin sheet P winds around a pair of adjustment roller 30A, 30B is prevented. The surface roughness of the auxiliary roller 31 is preferably adjusted in a range between the driving roller 30A and the driven roller 30B so that the resin sheet P is not wound around the auxiliary roller 31.

  As shown in FIG. 3, the driving roller 30A is provided with roller rotation driving means 94. Further, the driven roller 30B is provided with roller moving means 96 as shown in FIG. The driving roller 30A can be rotated about the axial direction of the driving roller 30A by a roller rotation driving means 94. Further, the driven roller 30B approaches the driving roller 30A while maintaining a parallel positional relationship with the driving roller 30A in a plane including the pair of adjusting rollers 30A and 30B by the roller moving unit 96, or It moves away from the driving roller 30A.

  The roller rotation drive means 94 is a rotation drive motor 98 connected to the driving roller 30A, and transmits the rotation torque of the rotation driving motor 98 to the driving roller 30A via, for example, a gear reduction mechanism (not shown). ing. The rotation drive motor 98 is provided with a rotation speed adjusting device 111 so that the rotation speed can be adjusted. The rotation speed adjusting device 111 may be, for example, a device that adjusts the current value for the electric motor. The resin sheet P is lowered by the extrusion speed at which the resin sheet P is pushed out from the extrusion slit 26 and the rotation of the pair of adjustment rollers 30A and 30B. The relative speed difference between the feed speed and the feed speed sent to the sheet is adjusted according to the extrusion speed of the resin sheet P.

  The sending speed of the resin sheet P by the pair of adjusting rollers 30A and 30B is, for example, when a pair of adjusting rollers 30A and 30B having a diameter of 100 mm is used to send the resin sheet P having a length of 2000 mm in the sending direction in 15 seconds. One shot takes about 6.4 rotations for 15 seconds, and the rotation speed of the pair of adjustment rollers 30A and 30B can be calculated to be about 25.5 rpm. The feeding speed of the resin sheet P can be easily adjusted by increasing and decreasing the rotational speed of the pair of adjusting rollers 30A and 30B.

  The driven roller 30B has a first gear 104 that can rotate around the rotation axis of the roller over the end peripheral surface 102 of the driven roller 30B so that the driven roller 30B rotates in synchronization with the driving roller 30A. ing. On the other hand, the driving roller 30A has a second gear 108 that can rotate around the rotation axis of the roller over the end peripheral surface 107 of the driving roller 30A. The second gear 108 meshes with the first gear 104.

  As shown in FIG. 2, the roller moving means 96 is composed of a piston-cylinder mechanism, and the tip of the piston rod 109 is connected to a cover 131 that supports the driven roller 30B so as to be rotatable in its axial direction. For example, by adjusting the air pressure, the piston 113 is slid with respect to the cylinder 115, thereby moving the driven roller 30B in the horizontal direction, and the distance D between the pair of adjustment rollers 30A, 30B can be adjusted. I have to.

  The roller moving means 96 expands the distance between the pair of adjustment rollers 30A and 30B beyond the thickness of the resin sheet P before the lowermost portion of the resin sheet P is supplied between the pair of adjustment rollers 30A and 30B ( 2), the resin sheet P is smoothly supplied between the pair of adjustment rollers 30A and 30B. Thereafter, the gap between the pair of adjustment rollers 30A and 30B is narrowed, and the resin sheet P is sandwiched between the pair of adjustment rollers 30A and 30B (a closed position constituting the gap D2 in FIG. 2A), and the pair of adjustment rollers 30A. , 30B, the resin sheet P is sent out downward.

  The stroke of the piston 113 may be set so as to be the distance between the open position and the closed position. Further, by adjusting the air pressure, it is possible to adjust the pressing force acting on the resin sheet P from the pair of adjustment rollers 30A and 30B when the resin sheet P passes between the pair of adjustment rollers 30A and 30B. is there.

  The range of the pressing force is that the pair of adjusting rollers 30A and 30B rotate, so that no slip occurs between the surface of the pair of adjusting rollers 30A and 30B and the surface of the resin sheet P, while the pair of adjusting rollers 30A. , 30B so that the resin sheet P is surely sent downward so that the resin sheet P is not torn off. Although it depends on the type of resin, it is set to, for example, 0.05 MPA to 6 MPA.

  The auxiliary roller 31 of the present embodiment is provided with the above-described roller rotation driving means and roller moving means. For this reason, the auxiliary roller 31 can be rotated around the axial direction of the auxiliary roller 31 by the roller rotation driving means. The rotation direction is the same as that of the driven roller 30B. The rotation speed is the same as that of the pair of adjustment rollers 30A and 30B. Further, as shown in FIG. 4B, the auxiliary roller 31 is moved horizontally by the roller moving means toward the driving roller 30A from the position of the resin sheet P sandwiched between the pair of adjusting rollers 30. It has become. Thereby, the auxiliary roller 31 of the present embodiment can send the resin sheet P downward so that the resin sheet P to be wound around the driven roller 30B is peeled off from the driven roller 30B by the rotation of the auxiliary roller 31. The roller diameter of the auxiliary roller 31 is preferably set in a range between the roller diameter of the driving roller 30A and the roller diameter of the driven roller 30B so that the resin sheet P is not wound around the auxiliary roller 31.

  The mold clamping device 14 molds the resin sheet P sent out from the stretching device 10 to mold a resin molded product having a desired shape. The mold clamping device 14 of the present embodiment is configured to include molds 32A and 32B and a mold driving device (not shown). The molds 32A and 32B are two divided molds. The mold driving device moves the molds 32A and 32B between the open position and the closed position in a direction substantially orthogonal to the supply direction of the molten resin sheet P.

  The molds 32A and 32B are disposed in a state where the cavities 116 are opposed to each other, and the cavities 116 are disposed so as to be substantially along the vertical direction. The surface of each cavity 116 is provided with a concavo-convex portion according to the outer shape of the resin molded product molded based on the molten resin sheet P and the surface shape.

  In each of the molds 32A and 32B, a pinch-off part 118 is formed around the cavity 116. The pinch-off part 118 is formed in an annular shape around the cavity 116 and protrudes toward the opposing molds 32A and 32B. . As a result, when the two divided molds 32A and 32B are clamped, the tip portions of the respective pinch-off portions 118 come into contact with each other, and the two molten resin sheets P1 and P2 are parting lines around the periphery. It is welded so that is formed. The distance between the surfaces of the opposing cavities 116A and 116B when the tip portions of the pinch-off portion 118 contact each other is set to be at least smaller than the total thickness of the resin sheet P1 and the resin sheet P2, thereby When the divided molds 32A and 32B are clamped, the resin sheet P1 and the resin sheet P2 can be surface-welded. Note that the pinch-off portion 118 may be provided in any one of the molds 32A and 32B.

  Presser plates 33A and 33B are slidably provided above and below the molds 32A and 32B. The presser plate moving devices 34A and 34B allow the presser plates 33A and 33B to be relative to the dies 32A and 32B. Can be moved. Further, one presser plate 33B is provided with a cutting blade 35, and the cutting blade 35 is moved along with the movement of the presser plate 33B, and the cutting blade 35 is configured to cut burrs. Burrs are generated above and below the molds 32A and 32B when the resin sheets P1 and P2 are clamped by the molds 32A and 32B.

  The holding plates 33A and 33B sandwich and hold burrs (resin sheets P1 and P2) generated above and below the molds 32A and 32B when the resin sheets P1 and P2 are clamped by the molds 32A and 32B. . The holding plates 33A and 33B are made of metal or the like. The presser plate moving devices 34A and 34B are devices used when the presser plates 33A and 33B are moved. The presser plate moving devices 34A and 34B are constituted by double-acting air cylinders or the like. The cutting blade 35 cuts burrs (resin sheets P1, P2) generated above and below the molds 32A, 32B. The cutting blade 35 is made of metal or the like.

  In the present embodiment, the presser plates 33A and 33B, the cutting blade 35, and the presser plate moving devices 34A and 34B constitute a burr cutting device. The burr cutting device is divided into a cutting side and a presser side, and one side where the cutting blade 35 is provided is the cutting side, and the other side where the cutting blade 35 is not provided is the pressing side. The burr cutting devices are arranged above and below the molds 32A and 32B, respectively.

  The molds 32A and 32B are each driven by a mold drive device, and two molten resin sheets P can be disposed between the molds 32A and 32B in the open position. On the other hand, in the closed position, the pinch-off portions 118 of the molds 32A and 32B are in contact with each other, and the annular pinch-off portions 118 are in contact with each other. Regarding the movement of the molds 32A and 32B from the open position to the closed position, the closed position, that is, the position where the pinch-off portions 118 abut each other is between the two resin sheets P1 and P2 in the molten state. The positions are equidistant from P1 and P2, and the molds 32A and 32B are driven by the mold driving device to move toward the positions.

  A vacuum suction chamber (not shown) is provided inside the mold 32A. The vacuum suction chamber communicates with the cavity 116A through the suction hole, and is sucked from the vacuum suction chamber through the suction hole. The resin sheet P1 is adsorbed toward the cavity 116A and shaped into a shape along the outer surface of the cavity 116A. Similarly, the mold 32B is provided with a vacuum suction chamber communicating with the cavity 116B through a suction hole. On the other hand, a blow pin (not shown) is applied to the mold 32B so that when the molds 32A and 32B are clamped, a blowing pressure can be applied from within the sealed space formed by both the molds 32A and 32B. Is installed.

  The resin sheets P1 and P2 are made of a sheet formed of an olefin resin such as polyethylene or polypropylene, or an amorphous resin. More specifically, the resin sheets P1 and P2 are preferably made of a resin material having a high melt tension from the viewpoint of preventing the occurrence of thickness variation due to drawdown, neck-in, etc. It is preferable to use a resin material with high fluidity in order to improve the transferability and followability.

  More specifically, it is a polyolefin (for example, polypropylene, high density polyethylene) which is a homopolymer or copolymer of an olefin such as ethylene, propylene, butene, isoprene pentene, methyl pentene, etc., and has an MFR (JIS) at 230 ° C. According to K-7210, measured at a test temperature of 230 ° C. and a test load of 2.16 kg) of 3.0 g / 10 min or less, more preferably 0.3 to 1.5 g / 10 min, or acrylonitrile butadiene Amorphous resin such as styrene copolymer, polystyrene, high impact polystyrene (HIPS resin), acrylonitrile / styrene copolymer (AS resin), MFR at 200 ° C. (test temperature 200 according to JIS K-7210) ℃, measured at a test load of 2.16 kg) is 3.0 to 60 g / 10 min More preferably, the melt tension at 30 to 50 g / 10 min and at 230 ° C. (using a melt tension tester manufactured by Toyo Seiki Seisakusho Co., Ltd., preheating temperature 230 ° C., extrusion speed 5.7 mm / min, diameter 2.095) A strand is extruded from an orifice having a length of 8 mm, and the strand is wound on a roller having a diameter of 50 mm at a winding speed of 100 rpm. The tension is 50 mN or more, preferably 120 mN or more. Is done.

  Further, in order to prevent the resin sheets P1 and P2 from being cracked by impact, it is preferable that a hydrogenated styrene thermoplastic elastomer is added in a range of less than 30 wt%, preferably less than 15 wt%. Specifically, a styrene-ethylene / butylene-styrene block copolymer, a styrene-ethylene / propylene-styrene block copolymer, a hydrogenated styrene-butadiene rubber and a mixture thereof are suitable as the hydrogenated styrene-based thermoplastic elastomer. The styrene content is less than 30 wt%, preferably less than 20 wt%, and the MFR at 230 ° C. (measured at a test temperature of 230 ° C. and a test load of 2.16 kg according to JIS K-7210) is 1.0 to 10 g / 10. Minute, preferably 5.0 g / 10 min or less and 1.0 g / 10 min or more.

  Furthermore, the resin sheets P1 and P2 may contain an additive. Examples of the additive include silica, mica, talc, calcium carbonate, glass fiber, carbon fiber, and other inorganic fillers, plasticizers, and stabilizers. , Coloring agents, antistatic agents, flame retardants, foaming agents and the like. Specifically, silica, mica, glass fiber or the like is added in an amount of 50 wt% or less, preferably 30 to 40 wt%, based on the molding resin.

<Control operation example of molding apparatus 100>
Next, an example of the control operation of the molding apparatus 100 according to the present embodiment will be described with reference to FIGS.

  First, a predetermined amount of melted and kneaded thermoplastic resin is stored in the accumulator 22, and a predetermined amount of extrusion of the thermoplastic resin stored in the accumulator 22 from the extrusion slits 26 provided at predetermined intervals in the T-die 28. Extrude intermittently. As a result, the molten resin sheet P is extruded from the extrusion slit 26 at a predetermined extrusion speed.

  The stretching device 10 moves the pair of adjustment rollers 30 </ b> A and 30 </ b> B to the open position, and widens the distance between the pair of adjustment rollers 30 </ b> A and 30 </ b> B arranged below the extrusion slit 26 than the thickness of the resin sheet P. Thereby, the lowest part of the molten resin sheet P extruded downward from the extrusion slit 26 can be smoothly supplied between the pair of adjustment rollers 30A and 30B. Note that the timing at which the distance between the pair of adjustment rollers 30A and 30B is increased from the thickness of the resin sheet P may be performed after the end of the secondary molding for each one shot, not after the start of extrusion.

  Next, the stretching device 10 moves the pair of adjusting rollers 30A, 30B close to each other and moves them to the closed position, narrows the distance between the pair of adjusting rollers 30A, 30B, sandwiches the resin sheet P, and then pairs the adjusting rollers 30A, 30B. The resin sheet P is sent out downward by rotation of 30A and 30B.

  Specifically, as shown in FIG. 4 (A), after extruding the molten resin sheet P from the extrusion slit 26, by driving the roller moving means 96, as shown in FIG. The pair of adjustment rollers 30A, 30B are moved close to each other and moved to the closed position, the resin sheet P is sandwiched by narrowing the distance between the pair of adjustment rollers 30A, 30B, and the resin sheet is rotated by the rotation of the pair of adjustment rollers 30A, 30B. P is sent out downward. At that time, while the resin sheet P swelled by the rotation of the pair of adjusting rollers 30A and 30B is being sent to the pair of adjusting rollers 30A and 30B, the pair of adjusting rollers 30A and 30B is lowered to the lower side of the resin sheet P. The rotational speeds of the pair of adjustment rollers 30A and 30B are adjusted so that the delivery speed is equal to or higher than the extrusion speed of the resin sheet P.

  More specifically, as the swelled resin sheet P is fed to the pair of adjustment rollers 30A and 30B, the length of the resin sheet P that hangs down in the vertical direction becomes longer, and the resin sheet P that hangs down due to the length increases. The upper part is thinned by its own weight of the resin sheet P (draw down or neck-in), while the pair of adjusting rollers 30A, 30B is set so that the feeding speed by the pair of adjusting rollers 30A, 30B is equal to or higher than the extrusion speed. By adjusting the rotation speed, the resin sheet P is pulled downward by the pair of adjustment rollers 30A and 30B, and the resin sheet P is stretched and thinned.

  At this time, the rotational speed of the pair of adjustment rollers 30A and 30B is decreased with the passage of time, and the delivery speed is adjusted to approach the extrusion speed of the resin sheet P.

  For example, while the extrusion speed of the resin sheet P is made constant, the rotational speeds of the pair of adjustment rollers 30A and 30B may be decreased stepwise over time. Alternatively, the rotational speed of the pair of adjustment rollers 30A and 30B may be made constant, while the extrusion speed of the resin sheet P may be decreased stepwise over time. Further, the rotation speed of the pair of adjustment rollers 30A and 30B and the extrusion speed of the resin sheet P may be changed stepwise with time within a range where the rotation speed of the pair of adjustment rollers 30A and 30B is larger.

  In any case, with the passage of time, the relative speed difference between the downward feeding speed of the resin sheet P due to the rotation of the pair of adjustment rollers 30A and 30B and the extrusion speed of the resin sheet P is reduced. The downward pulling force by the pair of adjusting rollers 30A and 30B decreases toward the upper part of the resin sheet P, and the thinning due to the pulling force is relatively reduced, and the thinning due to drawdown or neck-in is reduced. It is possible to cancel out, effectively prevent drawdown or neck-in, and thereby form a uniform thickness in the extrusion direction.

  Further, as shown in FIG. 4B, the stretching apparatus 10 of the present embodiment uses a roller moving unit to move the pair of adjusting rollers 30A and 30B close to each other and move them to the closed position. As shown in B), the auxiliary roller 31 is moved horizontally toward the driving roller 30A from the position of the resin sheet P sandwiched between the pair of adjusting rollers 30A and 30B. Further, the auxiliary roller 31 is rotated in the same rotational direction as the driven roller 30B by the roller rotation driving means. The rotation speed of the auxiliary roller 31 is adjusted so that the feeding speed of the resin sheet P due to the rotation of the auxiliary roller 31 is the same as the feeding speed of the resin sheet P by the pair of adjustment rollers 30A and 30B. Thereby, the auxiliary roller 31 of this embodiment can send out the resin sheet P downward so that the resin sheet P which is going to wind around the driven roller 30B is peeled off from the driven roller 30B. As a result, the stretching apparatus 10 can send out the thinned resin sheet P having a uniform thickness to the mold clamping apparatus 14.

  Next, as shown in FIG. 5, the resin sheet P sent out from the stretching device 10 is disposed between the divided molds 32A and 32B. Thereby, the resin sheet P is positioned in a form that protrudes around the pinch-off portion 118. When the positioning of the resin sheet P is completed, the rotation of the pair of adjustment rollers 30A and 30B and the auxiliary roller 31 of the stretching device 10 is temporarily stopped, and the resin sheet P is held between the pair of adjustment rollers 30A and 30B.

  The above process is performed for each of the two resin sheets P1 and P2, and the resin sheet P1 and the resin sheet P2 are disposed between the molds 32A and 32B in a state of being spaced apart from each other.

  Next, as shown in FIG. 6, the molds 32A and 32B are clamped, the resin sheet P1 is pressed against the cavity 116A, and the resin sheet P1 is shaped into a shape along the uneven surface of the cavity 116A. Further, the resin sheet P2 is pressed against the cavity 116B, and the resin sheet P2 is shaped into a shape along the uneven surface of the cavity 116B. Thereby, resin sheet P1, P2 can be shape | molded in the desired resin molded product 1. FIG. When the molds 32A and 32B are clamped, burrs 2 and 3 are generated above and below the molds 32A and 32B. A burr generated above the molds 32A and 32B is referred to as an upper burr 2, and a burr generated below the molds 32A and 32B is referred to as a lower burr 3. At this time, the auxiliary roller 31 is preferably retracted so as not to contact the resin sheet P. Thereby, it is possible to prevent the upper burr 2 from being caught by the auxiliary roller 31.

  After the molds 32A and 32B are clamped, as shown in FIG. 7, the presser-side presser plate moving device 34A is driven to advance the presser-side presser plate 33A along the die 32A. Since the presser plate moving device 34A of the present embodiment is constituted by an air cylinder, the presser plate 33A is advanced by air pressure. After the presser plate 33A is advanced to a predetermined position, the air pressure is stopped.

  Next, as shown in FIG. 8, the cutting-side presser plate moving device 34B is driven to advance the cutting-side presser plate 33B, and the burrs 2 and 3 are cut by the cutting blade 35 provided on the presser plate 33B. . At this time, since the presser-side presser plate moving device 34A stops the air pressure, the presser-side presser plate 33A moves backward as the cutting-side presser plate 33B advances. The holding plates 33A and 33B sandwich the burrs 2 and 3 generated above and below the molds 32A and 32B at substantially the same position as the mating surfaces of the molds 32A and 32B. As shown in FIG. 8, the burrs 2 and 3 are torn off by moving to the presser side. Thereby, even when the burrs 2 and 3 cannot be completely cut by the cutting blade 35, the burrs 2 and 3 can be easily torn off from the position where the cut is formed in the burrs 2 and 3. As a result, the resin molded product 1 in a total burr state with burrs 2 and 3 on the upper and lower sides can be divided into three parts: an upper burr 2, a resin molded product 1, and a lower burr 3.

  Next, as shown in FIG. 9, the holding plate 33 </ b> B on the cutting side is retracted, the air α is injected onto the lower burr 3, and the lower burr 3 is dropped vertically downward. By injecting air α to the lower burr 3, the lower burr 3 can be dropped downward without being caught by the holding plates 33A and 33B. The method of injecting air α is not particularly limited, and can be injected by an arbitrary method. In addition, by adjusting the air pressure from both sides of the lower burr 3 and injecting air α, the lower burr 3 can be dropped at a predetermined position. As a result, first, the lower burr 3 is dropped and conveyed onto the belt conveyor 40 located below the mold clamping device 14.

  Next, as shown in FIG. 10, the molds 32A and 32B are opened, and a desired resin molded product 1 is dropped vertically downward by a mold release device (not shown). Thereby, the resin molded product 1 falls on the belt conveyor 40 and is conveyed.

  Next, as shown in FIG. 11, the pair of adjustment rollers 30A and 30B and the auxiliary roller 31 on the cutting side are rotated again, and one of the upper burrs 2 sandwiched between the pair of adjustment rollers 30A and 30B is opened.

  Next, as shown in FIG. 12, the pair of adjustment rollers 30A and 30B and the auxiliary roller 31 on the pressing side are rotated again, and the other of the upper burrs 2 held between the pair of adjustment rollers 30A and 30B is opened. Thereby, the upper burr | flash 2 falls on the belt conveyor 40, and is conveyed.

  The mold clamping device 14 of the present embodiment is divided into an upper burr 2, a resin molded product 1, and a lower burr 3, and a belt conveyor 40 is provided with a time difference in the order of the lower burr 3, the resin molded product 1, and the upper burr 2. It is dropped and transported. For this reason, since the lower burr 3, the resin molded product 1, and the upper burr 2 are conveyed in this order by the belt conveyor 40, only the resin molded product 1 can be easily taken out from the belt conveyor 40 using a detection sensor or the like. . Then, the lower burr 3 and the upper burr 2 can be reused as recycled materials.

<Operation / Effect of Molding Apparatus 100 of this Embodiment>
The molding apparatus 100 according to the present embodiment includes a pair of adjustment rollers 30A and 30B and an auxiliary roller 31, and the driven roller 30B that constitutes the pair of adjustment rollers 30A and 30B is more resin resin P than the driving roller 30A. Is intentionally easy to wind. The auxiliary roller 31 is disposed between the pair of adjustment rollers 30A and 30B and the dies 32A and 32B. The resin sheet P extruded from the extrusion device 12 is sandwiched between the pair of adjusting rollers 30A and 30B and sent downward, and the auxiliary roller 31 is inserted between the pair of adjusting rollers 30A and 30B. The resin sheet P that has moved to the driving roller 30A side from the position and is about to be wound around the driven roller 30B by the auxiliary roller 31 is sent downward so as to be peeled off from the driven roller 30B.

  Thereby, the stretching device 10 prevents the resin sheet P extruded from the extrusion device 12 from being wound around the pair of adjustment rollers 30A and 30B, and makes the resin sheet P uniform in the vertical direction (extrusion direction). It can be sent out to the mold clamping device 14 in a thin and thin state (for example, about 1 mm).

  Further, in the molding apparatus 100 of the present embodiment, the mold clamping device 14 is provided with a burr cutting device above and below the molds 32A and 32B, and is divided into an upper burr 2, a resin molded product 1, and a lower burr 3 by the burr cutting device. Then, the lower burr 3, the resin molded product 1, and the upper burr 2 are respectively dropped in time on the belt conveyor 40 and conveyed. For this reason, since the lower burr 3, the resin molded product 1, and the upper burr 2 are conveyed in this order by the belt conveyor 40, only the resin molded product 1 can be easily taken out from the belt conveyor 40 using a detection sensor or the like. .

  Depending on the configuration of the molding apparatus 100, it may not be possible to use an extraction apparatus that is used when taking out a resin molded product. The take-out device is a device that picks up the upper burr 2 generated when the mold is clamped by the mold clamping device 14 and takes out the resin molded product 1 from the mold clamping device 14. As a configuration in which this take-out device cannot be used, for example, there is a case of a configuration of the molding device 100 having an insert device used when a reinforcing material or the like is inserted into the resin molded product 1.

  For this reason, in this embodiment, the resin molded product 1 is dropped and transported to the belt conveyor 40 installed below the mold clamping device 14.

  In this case, when the resin molded product 1 in the total burr state with the burrs 2 and 3 generated on the upper and lower sides of the resin molded product 1 is dropped and transported to the belt conveyor 40, the total burr state is generated at the time of dropping. The resin molded product 1 is caught by the mold clamping device 14 or the burrs 2 and 3 are adhered to the resin molded product 1 in the total burr state. In addition, the resin molded product 1 in the total burr state may be deformed when dropped. Further, the resin molded product 1 in the total burr state is caught on the belt conveyor 40. In this embodiment, since the extending | stretching apparatus 10 has the auxiliary roller 31, it is necessary to ensure the area | region between the extrusion apparatus 12 and the mold clamping apparatus 14 larger than before. As a result, the upper burr 2 becomes larger than the conventional one, and the above problem becomes more remarkable.

  Therefore, in this embodiment, the upper burr 2, the resin molded product 1, and the lower burr 3 are divided into three, and a time difference is provided in the order of the lower burr 3, the resin molded product 1, and the upper burr 2 to drop onto the belt conveyor 40. It is transported. Thereby, the problem mentioned above can be solved and only the resin molded product 1 can be easily taken out from the belt conveyor 40.

  The above-described embodiment is a preferred embodiment of the present invention, and the present invention is not limited to this, and various modifications can be made based on the technical idea of the present invention.

  For example, in the configuration of the molding apparatus 100 shown in FIG. 1 described above, an expander 50 can be provided below the mold clamping apparatus 14 as shown in FIG. The expander 50 is used for wrinkling the resin sheets P1 and P2. In this case, the resin sheets P1 and P2 are sandwiched by the expander 50 and rotated downward, so that the resin sheets P1 and P2 are stretched to stretch the wrinkles of the resin sheets P1 and P2.

  In the embodiment described above, the case where two resin sheets P1 and P2 are used has been described as an example. However, it is also suitable when a single resin sheet P is used.

  In the above-described embodiment, the cutting blade 35 is provided on one holding plate 33B, and the cutting blade 35 is moved along with the movement of the holding plate 33B, and the burrs 2 and 3 are cut by the cutting blade 35. . However, it is also possible to provide the cutting blade 35 independently of the holding plate 33B and to cut the burrs 2 and 3 by moving the cutting blade 35 independently. In this case, the above-described burr cutting device may be configured by the cutting blade 35 and the cutting blade moving device that moves the cutting blade 35 without providing the presser plate 33B. Moreover, it is also possible not to provide the cutting blade 35 but to tear the burrs 2 and 3 between the pair of pressing plates 33A and 33B. In this case, it is also possible to provide sharp projections at the end portions of the presser plates 33A and 33B and to cut the burrs 2 and 3 with the projections to tear them.

  In the embodiment described above, as shown in FIG. 4A, the auxiliary roller 31 is disposed at a predetermined position below the driven roller 30B. Then, as shown in FIG. 4B, the auxiliary roller 31 is moved to the driving roller 30A side from the position of the resin sheet P sandwiched between the pair of adjustment rollers 30A and 30B. The resin sheet P to be wound around the driven roller 30B is sent downward as being peeled off from the driven roller 30B. However, as shown in FIG. 4B, the auxiliary roller 31 is arranged in advance on the driving roller 30A side from the position of the resin sheet P sandwiched between the pair of adjustment rollers 30A and 30B. Then, the resin sheet P to be wound around the driven roller 30B by the auxiliary roller 31 can be sent downward as being peeled off from the driven roller 30B. That is, the auxiliary roller 31 is disposed between the pair of adjusting rollers 30A and 30B and the dies 32A and 32B, and the auxiliary roller 31 peels off the resin sheet P to be wound around the driven roller 30B from the driven roller 30B. If possible, the arrangement position of the auxiliary roller 31 is not limited to the position shown in FIG. 4 and can be arranged at an arbitrary position.

  In the above-described embodiment, the stretching device 10 is configured by the pair of adjustment rollers 30 </ b> A and 30 </ b> B and the auxiliary roller 31. However, it is also possible to use a belt-like rotating body instead of a roller.

  In the embodiment described above, the resin sheet P to be wound around the driven roller 30B by the auxiliary roller 31 is peeled off from the driven roller 30B. However, if the resin sheet P to be wound around the driven roller 30B can be peeled off from the driven roller 30B, it is not a roller-shaped rotating body like the auxiliary roller 31 but a plate-shaped member, for example. It is also possible to use a constructed auxiliary body. For example, the auxiliary body is composed of a plate-shaped member or the like like the presser plate 33 described above. Then, for example, as shown in FIG. 4B, the auxiliary body moves to the driving roller 30A side from the position of the resin sheet P sandwiched between the pair of adjustment rollers 30A and 30B, and is driven by the auxiliary body. The resin sheet P to be wound around the roller 30B is sent downward so as to be peeled off from the driven roller 30B. In this case, the surface of the auxiliary body is configured so that the resin sheet P can be sent downward along the surface of the auxiliary body.

DESCRIPTION OF SYMBOLS 100 Molding apparatus 10 Stretching apparatus 12 Extruding apparatus 14 Clamping apparatus 16 Hopper 18 Cylinder 20 Hydraulic motor 22 Accumulator 24 Plunger 26 Extrusion slit 28 T die 30A Driving roller 30B Follower roller 31 Auxiliary roller 32 Mold 33 Holding plate 34 Holding plate moving apparatus 35 Cutting blade 40 Belt conveyor 50 Expander 34 Extrusion slit 116 Cavity 118 Pinch-off part P1, P2 Resin sheet 1 Resin molded product 2 Upper burr 3 Lower burr

Claims (7)

A molding apparatus for molding a resin molded product by clamping a mold by sandwiching a molten resin sheet extruded from an extrusion apparatus with a mold,
Cutting at least one burr generated above and below the mold when the mold is clamped and the resin molded product formed inside the mold in a state where the mold is clamped Having a cutting part,
The cutting portion has a press plate for sandwiching the burr,
By moving the presser plate, the burrs are cut and the burrs cut in a state of being clamped by the presser plate are moved,
The presser plate is provided above and below the mold,
A first presser plate which is provided on the mold and cuts the upper burr generated on the mold and the resin molded product;
A lower burr provided under the mold and generated under the mold and a second presser plate for cutting the resin molded product;
2. A molding apparatus comprising: a control unit that causes a lowering burr, the resin molded product, and the upper burr to fall onto a conveying unit provided below the mold. The molding apparatus according to claim 1 , wherein the cutting unit includes a cutting blade that cuts the burr, moves the cutting blade, and cuts the burr with the cutting blade. The molding apparatus according to claim 2 , wherein the cutting blade is provided on a press plate that sandwiches the burr, and the cutting blade moves along with the movement of the press plate. A first control for controlling the movement of the second presser plate and releasing the lower burr sandwiched by the second presser plate from the second presser plate so that the lower burr is dropped onto the conveying means. Means,
Second control means for controlling movement of the mold and dropping the resin molded product clamped by the mold from the mold to drop the resin molded product onto the conveying means;
Third control for controlling movement of the first presser plate and releasing the upper burr clamped by the first presser plate from the first presser plate to drop the upper burr onto the conveying means. The molding apparatus according to any one of claims 1 to 3, further comprising: means. A molding apparatus molding method for molding a resin molded product by sandwiching a molten resin sheet extruded from an extrusion apparatus with a mold and clamping the mold,
When at least one burr generated above and below the mold when the mold is clamped, and the resin molded product formed inside the mold, the cutting portion in a state where the mold is clamped Having a cutting step of cutting at
The cutting portion has a press plate for sandwiching the burr,
By moving the presser plate, the burrs are cut, and the burrs cut in the state of being held between the presser plates are moved,
The presser plate is provided above and below the mold,
The cutting step includes
A first cutting step of cutting an upper burr generated on the mold and the resin molded product by a first pressing plate provided on the mold;
A second cutting step of cutting a lower burr generated under the mold and the resin molded product by a second pressing plate provided under the mold;
A molding method comprising: a dropping step of dropping onto a conveying means provided below the mold in the order of the lower burr, the resin molded product, and the upper burr . The cutting part has a cutting blade for cutting the burr,
The molding method according to claim 5 , wherein the cutting step moves the cutting blade and cuts the burr with the cutting blade. The dropping step is
A first drop for controlling the movement of the second presser plate and releasing the lower burr sandwiched by the second presser plate from the second presser plate so that the lower burr is dropped onto the conveying means. Process,
A second dropping step of controlling the movement of the mold and dropping the resin molded product clamped with the mold from the mold to drop the resin molded product onto the conveying means;
A third drop that controls the movement of the first presser plate and releases the upper burr clamped by the first presser plate from the first presser plate to drop the upper burr onto the conveying means. The molding method according to claim 5 , further comprising: a step.

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