Molding process for flat plate type extruded-blown product containing internal reinforced structure

A technology of internal reinforcement and molding process, applied in the field of extrusion blow molding, can solve the problems of reducing production efficiency, time-consuming and labor-intensive, low efficiency, etc., and achieve the effect of reasonable process steps, accurate process time, and optimization of process parameters

Active Publication Date: 2018-05-08
SHANGHAI UNIV OF ENG SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When flat products require both a certain strength and a smooth surface that is easy to clean, the parison on one side can be stretched to the parison on the other side during molding and fused with it, and then the reinforced structure in the concave shape Filling is put in, and then the surface is pasted to cover up, but this requires secondary processing, which is time-consuming, labor-intensive, inefficient, and high in cost
[0003] In the prior art, the concave reinforcement structure can be eliminated through the side core-pulling mechanism, and it can be built into the flat product. However, due to the characteristics of the polymer material, the operation of the side core-pulling mechanism and the cooperation of the extrusion and blowing process will affect the formation of the reinforcement structure. It is very important, for example, due to the large contact friction between the parison and the side core-pulling mechanism when the parison is molten, too early reset time of the side core-pulling mechanism will cause the reinforcement structure to be too late to be fully formed, and too late reset time of the side core-pulling mechanism will cause material solidification, there will be a gap in the middle of the reinforcement structure, and the side core-pulling mechanism will be reset too early or too late, which will lead to defects in flat products, reduce production efficiency, and increase costs; the wall thickness of the parison at the formation position of the reinforcement structure will also affect the reinforcement structure Formation, improper control of the wall thickness of the parison will also cause defects such as failure of the reinforced structure to form or gaps in the reinforced structure; in addition, the control of pressure and cycle time during the blow molding process due to changes in the wall thickness of the parison will also affect The quality of extrusion blown products and the type of extrusion blown products also affect the molding process that determines the quality of extrusion blown products

Method used

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  • Molding process for flat plate type extruded-blown product containing internal reinforced structure
  • Molding process for flat plate type extruded-blown product containing internal reinforced structure
  • Molding process for flat plate type extruded-blown product containing internal reinforced structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Follow the steps below to prepare a headboard with internal reinforcement:

[0036] Step 1: If figure 1 As shown, the engineering plastic high-density HDPE (high-density polyethylene) required for forming flat products is transferred through the hopper 1 of the blow molding machine to the barrel 2 and heated to melt, and the temperature of the instant temperature detection function distributed on the barrel 2 The sensor, by controlling the heating device, heats or stops the heating regulation on the place where the temperature is too low or too high on the barrel 2, so as to ensure that each part of the temperature-setting heating zone of each segment on the barrel 2 is evenly heated. In this embodiment, the barrel 2 It is divided into two temperature-setting heating zones equally along the axial direction. The temperature setting heating zone in the front section of the barrel 2 is set at 170°C at the connection section with the hopper 1, and the temperature setting he...

Embodiment 2

[0052] The present embodiment adopts the same process steps and process parameters as in Example 1, the difference is that:

[0053] Step 1: The temperature of the temperature-setting heating zone at the front section of the barrel 2 is set at 165°C, and the temperature of the temperature-setting heating zone at the rear section of the barrel 2 is set at 175°C.

[0054] Step 3: After the end of the tubular parison 4 away from the die 3 is manually sewed, when the tubular parison 4 is extruded close to the lower end of the mold 6, after the die 3 is pre-blown for 8 seconds, the first mold on the left side of the mold 6 is 61 and the second mold 62 positioned on the right side carry out clamping.

[0055] Step 4: 0.5s after the first mold 61 and the second mold 62 of the mold 6 are closed, place the first lateral core-pulling plate 51 and the second side of the lateral core-pulling mechanism 5 on the side of the first mold 61 The core-pulling plate 52 slides horizontally toward...

Embodiment 3

[0061] The present embodiment adopts the same process steps and process parameters as in Example 1, the difference is that:

[0062] Step 6: When the air blowing starts for 2 seconds, the first lateral core-pulling plate 51 and the second lateral core-pulling plate 52 of the lateral core-pulling mechanism 5 are completely drawn out horizontally from the inside of the mold cavity, and the first lateral core-pulling plate is ensured 51 and the front end of the second lateral core-pulling plate 52 are flush with the surface of the mold cavity.

[0063] The final formed flat extrusion blown products with internal reinforcement structure, such as Image 6 , 7 As shown, due to the increase of the contact time between the lateral core-pulling mechanism 5 and the tubular parison 4, the solidification of the material forming the internal reinforcement structure reduces the viscosity, thereby creating obvious gaps inside the internal reinforcement structure, which affects the extrusion...

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Abstract

The invention relates to the field of extruded-blown products, and provides a molding process for a flat plate type extruded-blown product containing an internal reinforced structure. The molding process comprises the steps that (1), the end, far away from a mouth mold, of a parison is manually sewn, after the parison is in place, pre-blowing is carried out for 8-12 seconds by the mouth mold, thenmolds are closed, after the molds are closed for 0.5-0.8 second, a side core-pulling mechanism arranged on one side of the mold slides towards the interior of a mold cavity, and when the molds are closed in place, the parison on the same side is pulled to be adhered with a parison on the opposite side; and (2), after the molds are closed in place, the parison is blown and molded, when blowing molding is carried out for 0.5-0.6 second, the side core-pulling mechanism is pulled out from the interior of the mold cavity, and the thickness of the side core-pulling mechanism is 5-6 mm, wherein thewall thickness of the parison is gradually increased to 90% of the opening degree of a mold opening from 25% of opening degree of the mold opening in the initial forming period by different wall thickness increase rates, and then reduced to 80% of the opening degree of the mold opening from the 90% of the opening degree of the mold opening to finish molding. According to the process, the flat plate type product is high in molding rate and good in quality, the period is short, and the cost is saved.

Description

technical field [0001] The invention relates to the field of extrusion blown product molding, in particular to a molding process of flat extrusion blown products with an internal reinforcement structure. Background technique [0002] In recent years, the extrusion blowing process has been widely used in the production of flat products. When flat products require both a certain strength and a smooth surface that is easy to clean, the parison on one side can be stretched to the parison on the other side during molding and fused with it, and then the reinforced structure in the concave shape Putting fillers in the middle, and then covering the surface with a skin, but this requires secondary processing, which is time-consuming, labor-intensive, inefficient, and high in cost. [0003] In the prior art, the concave reinforcement structure can be eliminated through the side core-pulling mechanism, and it can be built into the flat product. However, due to the characteristics of t...

Claims

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Application Information

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IPC IPC(8): B29C49/04B29C49/48
CPCB29C49/04B29C49/48
Inventor 廖秋慧陈杰刘淑梅张银龙祝璐琨高冲齐雪姚建冲汪东升
Owner SHANGHAI UNIV OF ENG SCI
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