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Production technique and device of polylactic acid PLA sheet material

A production process, polylactic acid technology, applied in the production process and equipment field of polylactic acid PLA sheet, can solve problems that are easily overlooked or underestimated

Active Publication Date: 2009-02-04
东阳市盛林塑胶有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The production of polylactic acid PLA sheet has strict requirements on the water content of the raw material polylactic acid PLA resin, and the production process of the sheet has high requirements on drying equipment. In the past related invention patent applications, this link was often overlooked or underestimated. Less than ideal polylactic acid PLA sheet with good mechanical and physical properties

Method used

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  • Production technique and device of polylactic acid PLA sheet material
  • Production technique and device of polylactic acid PLA sheet material

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specific Embodiment approach 1

[0017] Specific embodiment one: processing polylactic acid PLA sheet material production process flow described in the present invention, the first step raw material polylactic acid PLA resin drying, raw material enters the dehumidification drier (1) drying that molecular sieve is housed, makes the water content of raw material reach Process requirements, drying process conditions are: the temperature of the drying air is between 80°C and 130°C, and the dew point of the drying air is between -20°C and 55°C. In the second step of extrusion, the dried raw material enters the extruder (2) to be heated and plasticized, and is fully melted and plasticized in the barrel of the extruder, and the extruded is a molten fluid; in the third step of filtration, the melt is filtered The net (3) filters out impurities and infusibles in the melt; then the melt is pumped to the distributor and die head evenly and continuously through the melt pump (4); the fourth step is "casting", melting The...

specific Embodiment approach 2

[0018] Specific implementation mode two: in the implementation process of the whole production process, a certain amount of polylactic acid PLA sheet scraps are produced, and unqualified products and frame materials will also be produced during the secondary thermoforming process, and these frame scraps are crushed and reused. Since these frame scraps are amorphous, they must be crystallized before they are put into drying to improve their heat resistance to meet the requirements of the drying process. The crystallization process flow is as follows: recycle frame scraps into a pulverizer (11) for pulverization, the pulverized material enters a crystallizer (12) equipped with a stirrer, and is heated by hot air for crystallization. The temperature of the crystallization process is 80°C-120°C, and then enters the process flow of the specific embodiment one.

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Abstract

The invention discloses a process for producing polylactic acid (PLA) sheet material and equipment thereof. The raw material of PLA resin is dried by a drier, enters an extruder for extrusion and becoming melting fluid, the impurity and non-melt substances in the melting fluid are filtered by a filter screen, by the melting fluid pump, the melting fluid is pumped to a distributor mechanism and a mold head evenly and continually, a melting film is formed by a distributor mechanism and the mold head and is cast in a cooling roller for urgent cooling, so as to form PLA sheet material, the thickness of the molded PLA sheet material is measured on line by a thickness measurement apparatus, the marginal material is cut off, the PLA sheet material is drawn to a recoiler by a drawing device and rolled to PLA sheet rolls in certain specification, or is cut into PLA flat sheets in certain specification by a section cutter on line. The entire production process comprises recycle of leftover material of frames, and the process is: the recycled leftover material of frames is crushed by a muller and enters a crystallizer with a blender; hot air is led in for carrying out crystallization.

Description

technical field [0001] The invention relates to a high-tech technical solution for making polylactic acid PLA sheets by using polylactic acid resin made from renewable biological resources as a raw material, in particular to a production process and equipment for polylactic acid PLA sheets. Background technique [0002] Polylactic acid PLA (Polylactic acid) is a linear aliphatic polyester. It is a non-toxic, non-irritating fully biodegradable plastic that has been considered to have the most market potential so far. Polylactic acid PLA sheets and their products are in the market. Under the action of microorganisms, it can eventually degrade 100% into carbon dioxide and water, which is unparalleled by other plastics and is favored by European and American countries. This new biodegradable material has outstanding advantages in terms of mechanical properties and biodegradability. [0003] At present, countries all over the world are calling for environmental protection, and t...

Claims

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Application Information

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IPC IPC(8): B29C47/00B29B13/06B29C73/00B29C47/88B28B17/00B29K67/00B29L7/00
Inventor 郭军徐圣伟王智敏
Owner 东阳市盛林塑胶有限公司
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