CN101204849A - Polyethylene glycol terephthalate stretching processing technic - Google Patents
Polyethylene glycol terephthalate stretching processing technic Download PDFInfo
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- CN101204849A CN101204849A CNA200610022598XA CN200610022598A CN101204849A CN 101204849 A CN101204849 A CN 101204849A CN A200610022598X A CNA200610022598X A CN A200610022598XA CN 200610022598 A CN200610022598 A CN 200610022598A CN 101204849 A CN101204849 A CN 101204849A
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- stretching
- water tank
- cooling
- pet substrate
- pet
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- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
Abstract
The invention relates to a stretching processing technology of polyethylene glycol terephthalate (PET), which is that PET substrate is put in a refrigerator for cooling, after cooling the PET substrate is put into a stretching water tank to stretch with water temperature of the stretching water tank being controlled between 75 DEG C and 85 DEG C and then is cooled again. The invention ensures that internal and external temperatures of PET substrate are consistent in the process of stretching, thus guaranteeing the toughness and tensile strength of the stretched product. The invention can employ scrap materials with viscosity being larger than 0.72 to produce product with performance index being the same as that of products produced by adopting raw material with viscosity being 0.82 in prior art. The production process of the invention is of low requirements for control technique and does not need abundant experience and is easily operated.
Description
(1) technical field
The present invention is the PETG scratching process.
(2) background technology
PETG is a kind of macromolecular material, is commonly referred to as PET, is mainly used in the producd fibers silk, films for electrical purposes, mineral water bottle, strap etc.Traditional PET drawing process be with the PET substrate by clothes hanger membrana oralis slice after, directly enter water tank cooling, the cooling back is by oven for drying and heat, and enters in the die heater group to stretch again, and heats with infrared lamp simultaneously.This drawing process shortcoming is: because the PET substrate stretches in the die heater group and is exposed in the air, what use during heating is conduction pattern (the roasting heat of infrared lamp), so be subjected to the influence of outside air temperature, make the inside and outside temperature contrast of PET substrate big, particularly molecule rearranges when stretching, its inner intensification rapidly, it is very big to form internal and external temperature difference; PET is wide more thick more, and temperature contrast is big more, thereby makes toughness of products, tensile strength after PET stretches reduce embrittlement easily.For above-mentioned reasons, adopt this drawing process very high, generally require PET substrate viscosity greater than 0.82 to the raw material requirement, and experience, specification requirement height in producing.
(3) summary of the invention
The objective of the invention is to overcome above-mentioned the deficiencies in the prior art, a kind of PETG scratching process is provided, thus material tension and anti-fracture strength height after feasible the stretching, raw material require low, and controlling of production process is simple.
Solution of the present invention is: a kind of PETG scratching process is characterized in may further comprise the steps:
A. polyethylene terephthalate substrate by clothes hanger membrana oralis slice after, enter water tank cooling;
B. insert in the stretching water tank and stretch after the cooling, stretching water tank water temperature is controlled at 75～85 ℃;
C. the back cooling stretches.
By above-mentioned technology, the PET substrate is stretched in 75～85 ℃ of water tanks, both can heat to the surface of PET substrate, can control the PET substrate again makes inside heat up rapidly because molecule is arranged again in drawing process, make the PET substrate reach the internal and external temperature unanimity, guarantee the toughness and the tensile strength of product.In this technical process, use viscosity at the PET raw material more than 0.72, can reach the toughness and the tensile strength requirement of product.
Control stretching water tank water temperature is at 78-82 ℃ in the solution of the present invention, and effect is best.
The present invention's advantage compared with prior art: the present invention stretches the PET substrate in 75-85 ℃ of water tank, make the PET substrate reach the internal and external temperature unanimity, thereby has guaranteed the toughness and the tensile strength of stretched product.The present invention can use the waste and scrap of viscosity very low (greater than 0.72), and the control technology in the production process requires low, need not rich experiences, and is simple to operate.
(4) specific embodiment
Embodiment 1:PET scratching process is that PET substrate with viscosity 0.75 enters the refrigerator cooling after by clothes hanger membrana oralis slice, inserts after the cooling in the stretching water tank to stretch, and stretching water tank water temperature is controlled at 80 ℃, pull into required size shape after cooling promptly get product.
Present embodiment is drawn into the engineering bar strip with PET, and to test its technical indicator as follows:
| Model | Specification | Rupture pull force (KN) | The disrumpent feelings card rate % that stretches |
| PET25010 | 25*1.0 | ≥9.5 | ≤3.0 |
| PET25015 | 25*1.5 | ≥14.0 | ≤3.0 |
| PET30015 | 30*1.5 | ≥17.0 | ≤3.0 |
| PET50022 | 50*2.2 | ≥43.0 | ≤3.0 |
| PET60022 | 60*2.2 | ≥50.0 | ≤3.0 |
And the viscosity of used raw material PET substrate reaches more than 0.82 in the prior art, and its performance indications just can reach above-mentioned standard.
Embodiment 2: the PET substrate of viscosity 0.72 is gone into the water tank cooling by clothes hanger membrana oralis slice is laggard, insert after the cooling in the stretching water tank and stretch, stretching water tank water temperature is controlled at 80 ℃, pulls into the back cooling of required size and promptly gets product.
Claims (2)
1. PETG scratching process is characterized in that may further comprise the steps:
A. polyethylene terephthalate substrate by clothes hanger membrana oralis slice after, enter water tank cooling;
B. insert in the stretching water tank and stretch after the cooling, stretching water tank water temperature is controlled at 75～85 ℃;
C. the back cooling stretches.
2. PETG scratching process according to claim 1, the water tank water temperature that it is characterized in that stretching is controlled at 78-82 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA200610022598XA CN101204849A (en) | 2006-12-20 | 2006-12-20 | Polyethylene glycol terephthalate stretching processing technic |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA200610022598XA CN101204849A (en) | 2006-12-20 | 2006-12-20 | Polyethylene glycol terephthalate stretching processing technic |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101204849A true CN101204849A (en) | 2008-06-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA200610022598XA Pending CN101204849A (en) | 2006-12-20 | 2006-12-20 | Polyethylene glycol terephthalate stretching processing technic |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101204849A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102712109A (en) * | 2009-08-17 | 2012-10-03 | Sp科隆勒埃科特克公司 | Structural profile members for producing household utensils, and method for producing said profile members |
-
2006
- 2006-12-20 CN CNA200610022598XA patent/CN101204849A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102712109A (en) * | 2009-08-17 | 2012-10-03 | Sp科隆勒埃科特克公司 | Structural profile members for producing household utensils, and method for producing said profile members |
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| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20080625 |