A highly efficient automated film blowing process and manufacturing equipment thereof

Abstract

The present invention discloses an efficient and automated film blowing process and manufacturing equipment thereof, wherein the process comprises the following steps: (1) weighing: weighing various raw materials according to the film formula; (2) film blowing molding: the extruder melts the raw materials and transports them to the film blowing machine, and the film blowing machine performs film blowing molding; (3) herringbone plate extrusion guiding: the cylindrical film formed by the film blowing machine is transported to the inner side of the herringbone plate for extrusion guiding; (4) guiding slitting: a slitting knife extending left and right is provided on the inner side of the triangular guide frame, and the slitting knife cuts the left and right sides of the cylindrical film; (5) extrusion shaping: extrusion shaping is performed by an extrusion roller; (6) printing and drying: printing is performed by a printing box, and drying and fixing the color; (7) winding: two sheets of film are wound by a winding device. Compared with the prior art, the present invention can realize film slitting during film blowing molding, making film molding more efficient and greatly reducing production costs.

Description

Technical Field

[0001] The invention relates to the technical field of film blowing technology, and in particular to a high-efficiency automated film blowing technology and manufacturing equipment thereof. Background Art

[0002] Film blowing is a plastic processing method that refers to a plastic processing technology that heats and melts plastic particles and then blows them into a film. It usually involves extruding the polymer into a tubular film blank, inflating the tube to the required thickness using high-pressure air under a good melt flow state, and then cooling, shaping, and extruding it into a film.

[0003] After the film is blown and formed, it is generally necessary to slit the cylindrical film into two pieces of film. The existing slitting process generally involves first rolling up the film formed by the blown film, and then moving the film roll to the slitting device for slitting. This traditional blown film slitting process not only requires frequent handling of the film roll, which is time-consuming and labor-intensive, but also requires a large amount of labor costs. Not only is the forming efficiency low, but it also greatly increases the process cost. At present, technicians have also improved the equipment and set a cutter device on the traction roller so that the film can be directly slit during transportation after extrusion. However, after extrusion, the front side and the rear side of the film fit each other and are not easy to separate. In addition, the film is easily offset when it is transported by cutting on the traction, which affects the flatness of the slitting, thereby affecting the quality of the film product.

[0004] In view of this, the applicant conducted in-depth research on the above issues, which led to the present case. Summary of the invention

[0005] The main purpose of the present invention is to provide an efficient and automated film blowing process and a manufacturing device thereof, which can realize film slitting during film blowing forming, making film forming more efficient and greatly reducing production costs.

[0006] In order to achieve the above object, the solution of the present invention is:

[0007] An efficient and automated film blowing process comprises the following steps:

[0008] (1) Weighing: Weigh various raw materials according to the film formula and put them into the lower hopper of each extruder respectively;

[0009] (2) Film blowing: The extruder heats and melts the raw materials and extrude them to form a melt, which is then transported to the film blowing machine for film blowing.

[0010] (3) Herringbone plate extrusion guide: The cylindrical film formed by the film blowing machine is conveyed to the inner side of the herringbone plate, and the guide plate on the herringbone plate contacts the front side and the rear side of the cylindrical film, guiding the front side and the rear side of the cylindrical film toward the middle and approaching each other;

[0011] (4) Guided slitting: A triangular guide frame is provided inside the herringbone plate, and the front and rear sides of the triangular guide frame are fitted with the guide plates arranged front and rear on the herringbone plate, and the front inner side and rear inner side of the cylindrical film are fitted with the front and inner side of the triangular guide frame, so that the cylindrical film is tightly fitted and sleeved on the triangular guide frame when the cylindrical film is extruded and guided by the herringbone plate. A slitting knife extending left and right is provided inside the triangular guide frame, and the slitting knife cuts the left and right sides of the cylindrical film, so that the cylindrical film is cut into two front and rear film sheets;

[0012] (5) Extrusion shaping: The front and rear membranes after slitting are further guided upward through the herringbone plate and extruded and shaped by the extrusion roller;

[0013] (6) Printing and drying: The film is pulled and transported to the printing box for printing on both sides, and then dried and fixed;

[0014] (7) Winding: The two films are rolled up separately through the winding device.

[0015] A manufacturing device adopting the above-mentioned film blowing process includes a film blowing machine, a film blowing assembly frame, a herringbone plate, a triangular guide frame and an extrusion roller group. The film blowing assembly frame is provided with a film through hole, the film blowing machine is arranged below the film blowing assembly frame, the film mouth of the film blowing machine is directly opposite to the film through hole, the herringbone plate is arranged above the film through hole, the herringbone plate includes an inclined connecting frame, a plurality of guide plates are arranged on the connecting frame, the triangular guide frame is arranged between the connecting frames, the triangular guide frame includes an inclined front side plate and a rear side plate, the front side plate is fitted with the guide plate on the front side of the herringbone plate, the rear side plate is fitted with the guide plate on the rear side of the herringbone plate, the upper end of the triangular guide frame is provided with a slitting knife extending in the transverse direction, the extrusion roller group is arranged above the herringbone plate and is rotatably connected to the film blowing assembly frame.

[0016] Furthermore, the front side plate and the rear side plate are symmetrically arranged, the front side plate and the rear side plate are gradually inclined outward from top to bottom, and the width of the front side plate and the rear side plate is gradually reduced from top to bottom.

[0017] Furthermore, the triangular guide frame also includes a side guide plate, the front side of the side guide plate is connected to the two side edges of the front side plate, the rear side of the side guide plate is connected to the two side edges of the rear side plate, the side guide plate gradually tilts inward from top to bottom, and the width of the side guide plate gradually increases from top to bottom.

[0018] Furthermore, the side guide plate is provided with a fixing hole, the slitting knife extends transversely, and both ends of the slitting knife are respectively embedded in the fixing hole and fixed.

[0019] Furthermore, the side guide plate is provided with a fixing frame above the slitting knife, and both ends of the fixing frame are connected to the film blowing assembly frame.

[0020] Furthermore, the feeding end of the film blowing machine is provided with a screw extruder arranged side by side, and the feeding end of the screw extruder is provided with a lower hopper.

[0021] Furthermore, it also includes a printing oven, in which a printing roller and a drying roller are arranged.

[0022] Furthermore, a winding device is provided at the discharge end of the printing oven, and the winding device includes a winding frame, a first winding roller, a second winding roller, a winding motor and a tension adjustment roller. The first winding roller and the second winding roller are connected by a chain transmission, and the winding motor drives the first winding roller to rotate, and several tension adjustment rollers are rotatably connected to the winding frame.

[0023] Compared with the prior art, the beneficial effect is that in the method of the present invention, the film is extruded and guided by the herringbone plate and the triangular guide frame, so that the front side and the rear side of the film gradually approach and fit, which can ensure that the cylindrical film is tightly sleeved on the outer surface of the triangular guide frame, effectively avoiding the phenomenon of the film shifting left and right. At this time, the film is continuously and steadily transported upward, and the slitting knife cuts the two sides of the cylindrical film to cut the cylindrical film into two pieces of film, making the film cutting more stable and accurate, and improving the film slitting quality. At the same time, the film discharge end can produce two groups of film sheets at the same time, doubling the number of products, thereby greatly improving the efficiency of film blowing production. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the process of the present invention.

[0025] Figure 2 It is a three-dimensional diagram of the appearance structure of the device of the present invention.

[0026] Figure 3 for Figure 2 A partial enlarged view of area A.

[0027] Figure 4 This is a three-dimensional diagram of the appearance structure of the triangular guide frame.

[0028] Figure 5 It is a side view of the connection structure between the herringbone plate and the triangular guide frame.

[0029] Figure 6 It is the rear view of the connection structure between the herringbone plate and the triangular guide frame.

[0030] Figure 7 Schematic diagram of the cross-sectional structure when the slitting knife cuts the film.

[0031] Figure 8 Schematic diagram of the cross-sectional structural changes during film extrusion-guided cutting.

[0032] In the figure:

[0033] Film blowing machine 1, screw extruder 11, lower hopper 12, film blowing assembly frame 2,

[0034] Film through hole 21, herringbone plate 3, connecting frame 31, guide plate 32, triangular guide frame 4, front side plate 41, rear side plate 42, slitting knife 43, side guide plate 44, fixing frame 45,

[0035] Extrusion roller group 5, printing oven 6, winding device 7, winding frame 71,

[0036] A first winding roller 72 , a second winding roller 73 , and a tension adjustment roller 74 . DETAILED DESCRIPTION

[0037] In order to further explain the technical solution of the present invention, the present invention is described in detail below through specific embodiments.

[0038] like Figure 1-8 As shown, an efficient and automated film blowing process comprises the following steps:

[0039] (1) Weighing: Weigh various raw materials according to the film formula and put the raw materials into the lower hopper 12 of each extruder;

[0040] (2) Film blowing: The extruder heats and melts the raw materials and extrude them to form a melt, and then transports the melt to the film blowing machine 1, where the film blowing machine 1 performs film blowing molding;

[0041] (3) Extrusion guide of herringbone plate 3: The cylindrical film formed by film blowing machine 1 is conveyed to the inner side of herringbone plate 3, and the guide plate 32 on the herringbone plate 3 contacts the front side and the rear side of the cylindrical film, guiding the front side and the rear side of the cylindrical film toward the middle and approaching each other;

[0042] (4) Guided slitting: A triangular guide frame 4 is provided inside the herringbone plate 3, and the front side and rear side of the triangular guide frame 4 are fitted with the guide plates 32 provided front and rear on the herringbone plate 3, and the front inner side and rear inner side of the cylindrical film are fitted with the front side and inner side of the triangular guide frame 4, so that the cylindrical film is tightly fitted and sleeved on the triangular guide frame 4 when the cylindrical film is extruded and guided by the herringbone plate 3, and a slitting knife 43 extending left and right is provided inside the triangular guide frame, and the slitting knife 43 cuts the left and right sides of the cylindrical film, so that the cylindrical film is cut into two front and rear film sheets;

[0043] (5) Extrusion shaping: The front and rear membranes after slitting are further guided upward through the herringbone plate 3 and extruded and shaped by the extrusion roller to make the film smoother;

[0044] (6) Printing and drying: The film is pulled and transported to the printing box for printing on both sides, and then dried and fixed;

[0045] (7) Winding: The two film sheets are respectively wound up by the winding device 7.

[0046] A manufacturing device using the above-mentioned film blowing process includes a film blowing machine 1, a film blowing assembly frame 2, a herringbone plate 3, a triangular guide frame 4 and an extrusion roller group 5. The film blowing assembly frame 2 is provided with a film through hole 21. The film blowing machine 1 is arranged below the film blowing assembly frame 2. The film mouth of the film blowing machine 1 faces the film through hole 21, so that the cylindrical film formed by the film blowing machine 1 can pass through the film through hole 21 and be transported upward. The herringbone plate 3 is arranged above the film through hole 21. The herringbone plate 3 includes a symmetrical and inclined connecting frame 31. The connecting frame 31 gradually tilts outward from top to bottom, so that the connecting frames 31 are connected together in a herringbone shape. A plurality of guide plates 32 are arranged on the inner side of the connecting frame 31, and a curved guide surface that fits the film is arranged on the side of the guide plate 32. The triangular guide frame 4 is arranged between the connecting frames 31, and the triangular guide frame 4 includes a front side plate 41 and a rear side plate 42 which are arranged obliquely. The front side plate 41 is fitted with the guide plate 32 on the front side of the herringbone plate 3, and the rear side plate 42 is fitted with the guide plate 32 on the rear side of the herringbone plate 3. The upper end of the triangular guide frame 4 is provided with a slitting knife 43 extending in the transverse direction. The extrusion roller group 5 is arranged above the herringbone plate 3 and is rotatably connected to the film blowing assembly frame 2. The extrusion roller group 5 includes two extrusion rollers that are fitted with each other. The extrusion rollers are rotatably connected to the film blowing assembly frame 2 and press the slit and film sheets, so that the film sheets are kept in a flat state and conveyed forward, thereby improving the production quality of the film sheets.

[0047] In this embodiment, the front side plate 41 and the rear side plate 42 are symmetrically arranged, and the front side plate 41 and the rear side plate 42 are gradually inclined outward from top to bottom, and the width of the front side plate 41 and the rear side plate 42 is gradually reduced from top to bottom, so that the projection of the front side plate 41 and the rear side plate 42 on the vertical plane presents an inverted triangle, so that the film can be more easily set on the front side plate 41 and the rear side plate 42 from below, and as the contact area between the front side plate 41 and the rear side plate 42 and the blown film gradually increases, the film can be more stably and tightly set on the front side plate 41 and the rear side plate 42. The triangular guide frame 4 also includes a side guide plate 44, the front side edge of the side guide plate 44 is connected to the two sides of the front side plate 41, the rear side edge of the side guide plate 44 is connected to the two sides of the rear side plate 42, the side guide plate 44 is gradually inclined inward from top to bottom, and the width of the side guide plate 44 is gradually increased from top to bottom. After adopting the above structure, when the film passes through the slitting knife 43, the cross section of the film is rectangular and closely fits the front side plate 41, the rear side plate 42 and the side guide plate 44, so that the film can be prevented from deflecting when being squeezed and conveyed upward, and a stable conveying state can be maintained, so that the slitting knife 43 can cut the film more steadily, and the cutting track of the cutter can always remain straight, thereby improving the cutting efficiency of the film and further improving the product quality of the film. In addition, the film discharge end can produce two groups of film at the same time, doubling the number of products, greatly improving the efficiency of blown film production.

[0048] Preferably, a fixing hole is provided on the side guide plate 44, the slitting knife 43 extends horizontally, and the two ends of the slitting knife 43 are respectively embedded in the fixing hole and fixed. During production, it can be selected whether to install the slitting knife 43 according to customer needs, so that the slitting knife 43 is more convenient to disassemble and assemble. In addition, a fixing frame 45 is provided on the side guide plate 44 above the slitting knife 43, and the two ends of the fixing frame 45 are connected to the film blowing assembly frame 2 by screw locking. When the slitting knife 43 is installed on the triangular guide frame 4, the triangular guide frame 4 is connected to the film blowing assembly frame 2 through the fixing frame 45, so that the fixing frame 45 can be ensured to pass through the cutting gap between the front diaphragm and the rear diaphragm to avoid interference, and at the same time, the triangular fixing frame 45 is more convenient to disassemble and assemble, and is easy to replace and repair.

[0049] In this embodiment, the feeding end of the film blowing machine 1 is provided with screw extruders 11 arranged side by side, and there are three screw extruders 11. The feeding end of the screw extruder 11 is provided with a hopper 12. After weighing, each raw material is respectively put into the corresponding hopper 12 for heating and melting, which can accelerate the melting speed and extrusion conveying efficiency of the raw materials, and further improve the production efficiency of film blowing.

[0050] More preferably, the device of the present invention further comprises a printing oven 6, wherein a printing roller and a drying roller are arranged in the printing oven 6. The printing oven 6 can adopt common printing and drying equipment on the market, and can print and dry the slit film according to the demand, which has stronger applicability.

[0051] More preferably, a winding device 7 is provided at the discharge end of the printing oven 6, and the winding device 7 includes a winding frame 71, a first winding roller 72, a second winding roller 73, a winding motor (not shown) and a tension adjustment roller 74. The first winding roller 72 and the second winding roller 73 are connected by a chain transmission, so that the first winding roller 72 and the second winding roller can be wound synchronously. The winding motor drives the first winding roller 72 to rotate, and a plurality of tension adjustment rollers 74 are rotatably connected to the winding frame 71. The tension adjustment roller 74 adjusts the tension of the film to prevent the film from wrinkling. After adopting the above structure, the two films are wound synchronously by the first winding roller 72 and the second winding roller 73, so that the winding of the two groups of films is more stable, and the winding efficiency is improved at the same time.

[0052] Compared with the prior art, the beneficial effect is that in the method of the present invention, the film is extruded and guided by the herringbone plate 3 and the triangular guide frame 4, so that the front side and the rear side of the film gradually approach and fit, which can ensure that the cylindrical film is tightly sleeved on the outer surface of the triangular guide frame 4, effectively avoiding the phenomenon of the film shifting left and right. At this time, the film is continuously and steadily transported upward, and the slitting knife 43 cuts the two sides of the cylindrical film to cut the cylindrical film into two pieces of film, making the film cutting more stable and accurate, and improving the slitting quality of the film. At the same time, the film discharge end can produce two groups of film sheets at the same time, doubling the number of products, thereby greatly improving the efficiency of film blowing production.

[0053] The above embodiments and drawings do not limit the product form and style of the present invention. Any appropriate changes or modifications made by ordinary technicians in the relevant technical field should be deemed to be within the patent scope of the present invention.

Claims

1. A highly efficient and automated film blowing process, characterized in that: The following steps are involved: (1) Weighing: Weigh various raw materials according to the film formula and put them into the lower hopper of each extruder respectively; (2) Film blowing: The extruder heats and melts the raw materials and extrude them to form a melt, which is then transported to the film blowing machine for film blowing. (3) Herringbone plate extrusion guide: The cylindrical film formed by the film blowing machine is conveyed to the inner side of the herringbone plate, and the guide plate on the herringbone plate contacts the front side and the rear side of the cylindrical film, guiding the front side and the rear side of the cylindrical film toward the middle and approaching each other; (4) Guided slitting: A triangular guide frame is provided inside the herringbone plate, and the front and rear sides of the triangular guide frame are fitted with the guide plates arranged front and rear on the herringbone plate, and the front inner side and rear inner side of the cylindrical film are fitted with the front and inner side of the triangular guide frame, so that the cylindrical film is tightly fitted and sleeved on the triangular guide frame when the cylindrical film is extruded and guided by the herringbone plate. A slitting knife extending left and right is provided inside the triangular guide frame, and the slitting knife cuts the left and right sides of the cylindrical film, so that the cylindrical film is cut into two front and rear film sheets; (5) Extrusion shaping: The front and rear membranes after slitting are further guided upward through the herringbone plate and extruded and shaped by the extrusion roller; (6) Printing and drying: The film is pulled and transported to the printing box for printing on both sides, and then dried and fixed; (7) Winding: The two films are rolled up separately through the winding device; The manufacturing equipment using the film blowing process includes a film blowing machine, a film blowing assembly frame, a herringbone plate, a triangular guide frame and an extrusion roller group. The film blowing assembly frame is provided with a film through hole. The film blowing machine is arranged below the film blowing assembly frame. The film mouth of the film blowing machine is directly opposite to the film through hole. The herringbone plate is arranged above the film through hole. The herringbone plate includes an inclined connecting frame. The connecting frame is provided with a plurality of guide plates. The triangular guide frame is arranged between the connecting frames. The triangular guide frame includes an inclined front side plate and a rear side plate. The front side plate is fitted with the guide plate on the front side of the herringbone plate, and the rear side plate is fitted with the guide plate on the rear side of the herringbone plate. The upper end of the triangular guide frame is provided with a lateral extension. The slitting knife, the extrusion roller group is arranged above the herringbone plate and is rotatably connected to the film blowing group frame; the front side plate and the rear side plate are symmetrically arranged, the front side plate and the rear side plate are gradually inclined outward from top to bottom, and the width of the front side plate and the rear side plate is gradually reduced from top to bottom; the triangular guide frame also includes a side guide plate, the front side edge of the side guide plate is connected to the two side edges of the front side plate, the rear side edge of the side guide plate is connected to the two side edges of the rear side plate, the side guide plate is gradually inclined inward from top to bottom, and the width of the side guide plate is gradually increased from top to bottom; the side guide plate is provided with a fixing hole, the slitting knife extends horizontally, and the two ends of the slitting knife are respectively embedded in the fixing hole and fixed.

2. A highly efficient automated film blowing process as claimed in claim 1, characterized in that: The side guide plate is provided with a fixing frame above the slitting knife, and both ends of the fixing frame are connected to the film blowing assembly frame.

3. A highly efficient automated film blowing process as claimed in claim 1, characterized in that: The feeding end of the film blowing machine is provided with screw extruders arranged side by side, and the feeding end of the screw extruder is provided with a lower hopper.

4. A highly efficient automated film blowing process as claimed in claim 1, characterized in that: It also includes a printing oven, in which a printing roller and a drying roller are arranged.

5. A highly efficient automated film blowing process as claimed in claim 4, characterized in that: A winding device is provided at the discharge end of the printing oven, and the winding device includes a winding frame, a first winding roller, a second winding roller, a winding motor and a tension adjustment roller. The first winding roller and the second winding roller are connected by a chain transmission, and the winding motor drives the first winding roller to rotate, and a plurality of tension adjustment rollers are rotatably connected to the winding frame.

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