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An online double-layer composite plastic blown film and its manufacturing method

A manufacturing method and double-layer compounding technology, applied in the direction of chemical instruments and methods, layered products, flat products, etc., can solve the problems of less functionality and easy sticking to rolls, so as to inhibit melting softening, inhibit roll sticking, and improve materials The effect of the design

Active Publication Date: 2016-08-24
JIANGYIN BAOBO PACKING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the defects that the existing plastic blown film formed by online double-layer compounding of film bubbles containing a single microlayer structure has less functionality and is easy to stick to the roll, and to provide a film that can not damage the material performance and is not sticky to the roll. On-line double-layer composite plastic blown film containing multi-microlayers that can be produced on the basis of the present invention, and a manufacturing method of such a plastic blown film

Method used

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  • An online double-layer composite plastic blown film and its manufacturing method
  • An online double-layer composite plastic blown film and its manufacturing method
  • An online double-layer composite plastic blown film and its manufacturing method

Examples

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Embodiment 1

[0045] The invention is an online double-layer composite plastic blow molding film. The plastic blown film is formed by heat-sealing the inner layer of the multi-layer co-extrusion blown bubble 1; the composition and weight percentage of the inner layer of the bubble 1 are: EVA10~30%, COC40~60% and SEBS10 ~30%; the material of the outer layer of the bubble 1 has a melting point higher than the Vicat softening point of the material of the inner layer of the bubble 1, such as one of PE, PP and PA.

[0046] The manufacture method of this plastic blow molding film comprises the following steps:

[0047] S1. Melting and extruding each layer of material for manufacturing the bubble 1 in an extruder;

[0048] S2. The film bubble 1 co-extruded from the extrusion die is compressed into a double-layer film by the herringbone frame 2, and at the same time, it is heated to 55°C by the far-infrared heating device 3 on the ~75°C, reaching near the Vicat softening point of the inner layer ...

Embodiment 2

[0055] On the basis of Example 1, such as figure 2 As shown, after the cooling roller 9 is cooled and before the wind-up roller 10 winds up, the edge of the cooled sheet can also be cut off by the trimming roller 11, so that the performance of the film is more uniform.

[0056] In addition, during the heat-sealing process, the bubble 1 can also be vented at the same time, for example, on both sides of at least one heat-sealing steel roller of the heat-sealing roller group 7, there are openings for forming an exhaust port on the edge of the bubble 1 after being flattened. mechanism. Such as image 3 As shown, the opening mechanism is provided on both sides of the second steel roller 72 with the teeth 12 having a triangular cross-section. At the same time, the first steel roller 71 and the third steel roller 73 are provided with grooves 13 matching with the notches 12 at positions corresponding to the notches 12 of the second steel roller 72 . Arranging the notched teeth 12 ...

Embodiment 3

[0058] The invention is an online double-layer composite plastic blow molding film. The difference from Example 1 is that the film bubble 1 obtained by multi-layer co-extrusion blow molding is subjected to online unidirectional longitudinal stretching and annealing after the inner layer of the line is heat-sealed and shaped before cooling, so that the heat-sealed thickness is doubled, stretched and stretched. Unidirectional longitudinally stretched plastic blown film of half-stretch thickness. The specific longitudinal stretching and annealing steps are:

[0059] S* 1 . Unidirectional longitudinal stretching of the shaped double-layer film in a heated state: Specifically, the shaped double-layer film is preheated to 60-85°C by two preheating rollers 14, and then passed by four stretching rollers 15 When stretching at a temperature of 75-110°C, the stretching ratio of each stretching roller 15 is kept increasing in the range of 1.0-2.0 times along the direction of material tr...

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Abstract

The invention discloses an online double-layer composite plastic blow-molding film sheet which is formed by softening inner layers of a plurality of layers membrane bubbles which are co-extruded and blow-molded, wherein the inner layers of the membrane bubbles consist of EVA, COC and SEBS; a melting point of materials of the outer layers of the membrane bubbles is higher than a Vica softening point of the materials of the inner layer of the membrane bubbles. By optimizing the materials of the inner layers of the membrane bubbles, sticking is inhibited when the hot-pressing effect is improved, the thickness uniformity, the transparency, the heat-sealing uniformity, and the like of the membrane sheet are improved, the prepared membrane sheet has extensive re-processing capacity; after being heat-sealed and thickened, the membrane sheet is stretched and thinned, so that the film sheet has the performances of a blow-molding material and a flow casting material, and can be used as a packaging box back seal strip on a high-speed packaging body production line. Besides, the invention further discloses a manufacturing method for the online double-layer composite plastic blow-molding film sheet.

Description

technical field [0001] The invention relates to a membrane, in particular to an online double-layer composite plastic blow molding membrane and a manufacturing method thereof. Background technique [0002] Traditional plastic film production methods include casting process and film blowing process, and the thickness of the produced plastic film is generally between 12.5 and 300 microns. For thicker films or sheets, the casting process and blown film process are helpless, and need to be bonded by glue, resulting in low peel strength of the product and increasing the complexity of the process. [0003] The Chinese patent whose authorized notification number is CN101220181B discloses a method and equipment for making a double-layer composite sheet of plastic film on a blown film machine. The composition of the manufactured plastic sheet is a blend of 5-65% low-density polyethylene and 95-35% ethylene / vinyl acetate copolymer; the patent uses a single microlayer film bubble blow...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B27/32B32B27/34B29C55/28B29C55/06B29C71/02B29C69/00
CPCB29D7/01B32B27/30B32B27/306B32B2250/24B32B2270/00B32B2307/31B32B2307/412B32B2439/62
Inventor 陈伟
Owner JIANGYIN BAOBO PACKING
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