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A method for producing plastic trays using a hollow blow molding machine

A technology of plastic trays and blow molding machines, which is applied in the field of plastic product processing and molding, and can solve problems such as easy welding of trays, insufficient density, and thinning of parisons.

Active Publication Date: 2019-05-10
吴忠市恒通塑料制品有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The outstanding disadvantages of the traditional tray production process are: the uniformity of the wall thickness of the hollow blow molding product is not easy to control, the wall thickness is uneven, the weight is not enough, the raw material consumption is large, the density does not meet the requirements, and the production cost is high, especially for large and complex hollow pallets. Products, which are affected by the weight of the parison, resulting in thinning and necking of the parison mouth
The above-mentioned disclosed patent is an injection molding method, and requires reprogramming, complicated operation, and open welding is prone to occur during the use of the tray

Method used

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  • A method for producing plastic trays using a hollow blow molding machine
  • A method for producing plastic trays using a hollow blow molding machine
  • A method for producing plastic trays using a hollow blow molding machine

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Embodiment 1 raw material preparation

[0044] 1. Preparation of modified nano-carbon:

[0045] The preparation method of the modified nano-carbon comprises the following steps: uniformly mixing the middle mold carbon fiber, single-walled carbon nanotube, ammonium persulfate and deionized water in a mass ratio of 1:1.1:90:1000, first at a power of 300W, Ultrasonic treatment with a frequency of 22KHz for 30min, and then high-voltage pulsed electric field treatment for 12min under the conditions of electric field intensity 10kV / cm, pulse time 300μs, and pulse frequency 200Hz; the treated mixture was reacted at a speed of 110r / min and a temperature of 60°C for 1.5h, and the reaction solution Filtrate with a PP microporous filter membrane with a pore size of 0.22 μm, wash repeatedly with deionized water until neutral, and finally vacuum-dry at 75° C. to constant weight and pulverize to obtain the modified nanocarbon.

[0046] 2. Preparation of biological antioxidant:

[004...

Embodiment 2

[0054] A method for producing plastic trays using a hollow blow molding machine, comprising the steps of:

[0055] 1) Material injection: Put the special material for the tray into the extruder for melting, wherein the screw temperature is 172°C, the screw speed is 65rpm, the temperature of the storage tank is 193°C, the die temperature is 198°C, and the tubular hollow parison is extruded;

[0056] 2) Mold clamping and inflation: Clamp the bottom of the tubular hollow parison, the front mold and the rear mold begin to close slowly, at the same time, the blowing port on the extruder pre-blows air to the hollow position of the tubular hollow parison, the air pressure is 0.55MPa, the tubular The hollow parison expands slowly, and stop the pre-blowing when the inflation ratio reaches 1.6:1. At this time, the pre-blowing time is 4s, the distance between the front and rear molds is 10cm, the mold temperature is controlled at 38°C, and the upper part of the hollow parison is clamped. ...

Embodiment 3

[0067] A method for producing plastic trays using a hollow blow molding machine, comprising the steps of:

[0068] 1) Material injection: Put the special material for the tray into the extruder for melting, wherein the screw temperature is 165°C, the screw speed is 60rpm, the temperature of the storage tank is 190°C, the die temperature is 195°C, and the tubular hollow parison is extruded;

[0069] 2) Mold clamping and inflation: Clamp the bottom of the tubular hollow parison, the front mold and the rear mold begin to close slowly, and at the same time, the blowing port on the extruder pre-blows air to the hollow position of the tubular hollow parison, the air pressure is 0.50MPa, and the tubular hollow parison The hollow parison slowly expands, and when the inflation ratio reaches 1.3:1, stop the pre-blowing. At this time, the pre-blowing time is 2s, the distance between the front and rear molds is 9cm, the mold temperature is controlled at 30°C, and the upper part of the holl...

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Abstract

The invention discloses a method for producing a plastic tray by utilizing a hollow blow molding machine. The method comprises the steps of sealing an original air outlet of a blowing hole in the bottom of a traditional front die of the plastic tray, and arranging five blowing needles on the forming surface of the front die by utilizing a ventilation channel of the original bottom blowing hole; clamping the bottom of a tubular hollow blank when the blank is discharged, beginning to assemble, preblowing air to the hollow position of the tubular hollow blank through a blowing port in an extruding machine at the same time, stopping preblowing air when the tubular hollow blank is expanded to the set size, and continuing assembling; at the time, the five blowing needles are slowly close to the hollow blank, firstly, the hollow blank is punctured by the longest central blowing needle so as to blow air, and secondly, the hollow blank is punctured by the corner blowing needles with the same length at four corners so as to blow air, so that simultaneous blowing from five side surfaces is realized, and the tray blank is uniformly and closely adhered to the surface of a die cavity instantly. Finally, the method for producing the plastic tray, which has the advantages of uniformity in wall thickness, high intensity, low raw material consumption, low cost, stable quality and high efficiency, is provided.

Description

technical field [0001] The invention relates to a method for processing and molding plastic products, in particular to a method for producing plastic trays using a hollow blow molding machine. Background technique [0002] Hollow blow molding machine is one of the three leading products of my country's plastic machinery. Its development started late, but its development speed is very fast. After nearly two decades of development, my country's hollow plastic molding machine has made great progress, basically meeting However, with the rapid development of the plastic packaging industry, the structure of hollow products has undergone great changes, especially the application of hollow products in the automotive industry is increasing, raw material developers In order to adapt to the development of the automobile industry, various new hollow molding materials are actively developed. Compared with injection molding machines and extruders, my country's hollow blow molding machines ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C49/60B29C49/04C08L23/06C08K13/06C08K9/00C08K7/06C08K7/24B29K23/00B29L31/00
CPCB29C49/04B29C49/60B29C2049/609B29K2023/065B29L2031/7178C08K7/06C08K7/24C08K9/00C08K13/06C08K2201/011C08L23/06
Inventor 江立民
Owner 吴忠市恒通塑料制品有限公司
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