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Double-bubble blown film moulding method for producing polyester thermal contraction film

A technology of heat-shrinkable film and molding method, which is applied in the field of double-bubble blown film forming of heat-shrinkable polyester film, can solve problems such as high product cost, lack of flexibility and adaptability, and lack of market competitive advantages, and achieve Reduce the overall cost of products, enhance market competitiveness, and easily adjust product specifications

Inactive Publication Date: 2009-08-12
BEIJING UNIV OF CHEM TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The polyester heat-shrinkable film production method disclosed above is basically a one-way or two-way flat film stretching method. This method has a long process and a huge investment in equipment; on the other hand, due to the high production capacity of the unit, it should be applied to a single specification The large-scale production of products is difficult to adapt to the production of multi-specification and small-batch products, especially for the heat-shrinkable sleeve label film with changing product specification requirements. This production method lacks sufficient flexibility and adaptability, and the product cost High, compared with the cheap PVC heat shrinkable film, it has no market competitive advantage

Method used

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  • Double-bubble blown film moulding method for producing polyester thermal contraction film
  • Double-bubble blown film moulding method for producing polyester thermal contraction film

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Experimental program
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Embodiment 1

[0037] The polyester raw material is PETG, the screw diameter is 65mm, the length-to-diameter ratio is 33, the die diameter of the blow molding head is Φ100, and the far-infrared heating is used for secondary inflation. The drying temperature of raw materials is 68°C. It is 3-stage temperature control, and the temperature is set at 85°C, 85°C, 90°C. The large-diameter oven is 1-stage temperature control, and the temperature is set at 170°C. The secondary inflation ratio is 2.2, and the secondary stretching ratio is 1.03 to obtain a finished film with a folded diameter of 610mm. After testing, the thermal shrinkage rate in the transverse direction is 51%, and the thermal shrinkage rate in the longitudinal direction is 3.0%.

Embodiment 2

[0039] The polyester raw material is PETG, the screw diameter is 65mm, the length-to-diameter ratio is 33, the die diameter of the blow molding head is Φ100, the water bath heating is used for secondary inflation, the drying temperature of the raw material is 68°C, and the heating temperature of the water tank is set at 87°C. ℃, the secondary inflation ratio is 2.3, and the secondary stretching ratio is 1.02 to obtain a finished film with a folded diameter of 615 mm. After testing, the thermal shrinkage rate in the transverse direction is 52%, and the thermal shrinkage rate in the longitudinal direction is 2.0%.

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Abstract

The invention relates to a double bubble blow-molding film molding method of polyester heat-shrinkable film, belonging to the processing field of polymer materials. Polyester material is fed into a single-screw extrusion machine to carry out plasticizing extrusion after being dried, and a first film bubble is obtained after being blew by a blowing mould ram head, the first bubble is formed into a first bubble double-bending film through a first gable and a first pull roll, and secondary blowing is carried out to obtain a second film bubble for quenching molding after secondary heating is carried out to be in elastomeric state between Tg and Tf (Tg being a vitrification temperature, and Tf being a fusion temperature) through a second pull roll and a heating device, a second bubble double-blending film is formed through a second gable and a third pull roll and lastly taken up to obtain the polyester heat-shrinkable film. Compared with the existing flat film stretching method, the invention has the characteristics of small equipment investment, easy regulation for product standard and strong flexibility, and is applied to heat-shrinkable extension type label or goods package of containers.

Description

technical field [0001] The invention belongs to the field of polymer material processing, and relates to a forming method of a heat-shrinkable polyester film, more specifically, to a heat-shrinkable polyester film suitable for a heat-shrinkable sleeve label of a container or an article package double bubble blown film forming method. Background technique [0002] At present, the materials used to manufacture heat-shrinkable sleeve labels include polyvinyl chloride (PVC), polystyrene (PS) heat-shrinkable films, and the like. PVC heat-shrinkable film has good shrinkability, and it is not easy to wrinkle when shrinking. It can meet the packaging requirements of containers of various shapes and has a wide range of applications. The cheapest of membrane materials. However, the light stability and thermal stability of PVC are poor, and the decomposition product vinyl chloride monomer during heating has been listed as a carcinogen by the medical profession; its waste will produce...

Claims

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Application Information

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IPC IPC(8): B29C49/04B29C47/60B29C49/48B29L7/00
CPCB29C47/0054B29C47/0057B29C47/385B29C48/0018B29C48/0017B29C48/397
Inventor 何继敏薛平杨涛陈亚龙
Owner BEIJING UNIV OF CHEM TECH
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