Online double-layer composite plastic blow-molding film sheet and manufacturing method thereof

A double-layer compounding and manufacturing method technology, applied in the direction of chemical instruments and methods, layered products, flat products, etc., can solve the problems of easy sticking to rolls, less functionality, etc., to achieve the suppression of melting softening, reduction of residence time, and improvement of materials The effect of the design

Active Publication Date: 2015-04-22
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

Method used

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  • Online double-layer composite plastic blow-molding film sheet and manufacturing method thereof
  • Online double-layer composite plastic blow-molding film sheet and manufacturing method thereof
  • Online double-layer composite plastic blow-molding film sheet and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0044] Example 1

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

[0046] The manufacturing method of the plastic blown film includes the following steps:

[0047] S1. Melt and extrude the materials of each layer of the film bubble 1 in the extruder;

[0048] S2. The multi-layer co-extruded film bubble 1 from the extrusion die is flattened into a double-layer film through the herringbone 2, and at the same time heated to 55 by the far-infrared heating device 3 at the herringbone 2 which acts as the preheating function of the film bubble. ~75℃, reaching the vic...

Example Embodiment

[0054] Example 2

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

[0056] In addition, during the heat-sealing process, the bubble 1 can also be vented at the same time. For example, at least one heat-sealing steel roll of the heat-sealing roller set 7 is provided with an opening for forming an air vent on the edge of the bubble 1 after flattening. mechanism. Such as image 3 As shown, the opening mechanism is provided on both sides of the second steel roller 72 with triangular teeth 12 in cross section. At the same time, the first steel roller 71 and the third steel roller 73 are provided with grooves 13 corresponding to the notched teeth 12 of the second steel roller 72. The provision of the notched teeth 12 in this way not only realizes the venting of the openin...

Example Embodiment

[0057] Example 3

[0058] The invention is an online double-layer composite plastic blown 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 treatment after the on-line inner layer heat sealing and shaping, and before cooling, to obtain a heat-sealed thickness doubled and stretched. A unidirectional longitudinally stretched plastic blown film with a half-thickness stretch. The specific longitudinal stretching and annealing treatment steps are:

[0059] S* 1 . The shaped double-layer film is unidirectionally stretched longitudinally under heating: specifically, the shaped double-layer film is preheated to 60~85℃ by two preheating rollers 14, and then passed through four stretching rollers 15 Stretching at a temperature of 75~110℃, keeping the stretching ratio of each stretching roller 15 in the range of 1.0~2.0 times along the material travel dir...

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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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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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