Shrinkage

Physical indicators

Shrinkage is read as shou suo lv, Calculation formula Yes (before R and after R)/before R * 100%. Shrinkage percentage.

Shrinkage is an important index of the geometric stability of the substrate. Sheet base The ratio, expressed as a percentage, between the change of vertical and horizontal geometric dimensions at a certain temperature and within a specified time and the original geometric dimensions of the substrate. The higher the shrinkage, the worse the substrate performance.^{[1 ]}

Chinese name: Shrinkage
Foreign name: Shrinkage ratio

Pinyin: shōu suō lǜ
Calculation formula: (R front - R rear)/R front * 100%

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Introduction:

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Noodles, Sliver The percentage between the length difference before and after drying and the length before drying.

The shrinkage rate of plastic refers to the percentage of the difference between the size of plastic parts at the molding temperature and the size after being taken out of the mold and cooled to room temperature. It reflects the degree of dimensional reduction of plastic parts after being taken out of the mold and cooled. The factors that affect the plastic shrinkage rate are: plastic variety, molding conditions, mold structure, etc. different Polymer materials The shrinkage of is different. Secondly, the shrinkage rate of plastic is also closely related to the shape of plastic parts, the complexity of internal structure and whether there are inserts.

Volume shrinkage of formation crude oil ：η=（Bof-1）/Bof×100%；

Shrinkage of common plastics

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Plastic molding Processing temperature, mold temperature and general plastic shrinkage during injection molding
Chinese name	english	density	Glass fiber content	Average specific heat	Processing temperature	Mold temperature	Shrinkage
-	-	[g/cm³]	[%]	[kJ/(kg·K)]	[℃]	[℃]	[%]
polystyrene	PS	one point zero five	-	one point three	180-280	ten	0.3-0.6
Polystyrene, medium high impact	HI-PS	one point zero five	-	one point two one	170-260	5-75	0.5-0.6
Polystyrene acrylonitrile	SAN	one point zero eight	-	one point three	180-270	50-80	0.5-0.7
Acrylonitrile butadiene styrene	ABS	one point zero six	-	one point four	210-275	50-90	0.5-0.7
Phenylene acrylonitrile styrene acrylic acid	ASA	one point zero seven	-	one point three	230-260	40-90	0.4-0.6
low density polyethylene	LDPE	zero point nine five four	-	2.0-2.1	160-260	50-70	1.5-5.0
High density polyethylene	HDPE	zero point nine two	-	2.3-2.5	260-300	30-70	1.5-3.0
polypropylene	PP	zero point nine one five	-	0.84-2.5	250-270	50-75	1.0-2.5
Polybutene GR	PPGR	one point one five	thirty	1.1-1.35	260-280	50-80	0.5-1.2
Polyisobutene	IB	-	-	-	150-200	-	-
polymethylpenten	PMP	zero point eight three	-	-	280-310	seventy	1.5-3.0
Soft PVC	PVC-soft	one point three eight	-	zero point eight five	170-200	15-50	>0.5
Rigid PVC	PVC-rigid	one point three eight	-	0.83-0.92	180-210	30-50	zero point five
Polyfluoroethylene	PVDF	one point two	-	-	250-270	90-100	3.0-6.0
teflon	PTFE	2.12-2.17	-	zero point one two	320-360	200-230	3.5-6.0
Fluorinated vinyl propylene copolymer	FEP	-	-	-	-	-	-
Polymethyl methacrylate (propylene)	PMMA	one point one eight	-	one point four six	210-240	50-70	0.1-0.8
Polyoxymethylene	POM	one point four two	-	1.47-1.5	200-210	>90	1.9-2.3
Polyphenylene oxide or polyphenylene oxide	PPO	one point zero six	-	one point four five	250-300	80-100	0.5-0.7
Polyphenylene oxide GR	PPO-GR	one point two seven	thirty	one point three	280-300	80-100	-
Cellulose acetate	CA	1.27-1.3	-	1.3-1.7	180-320	50-80	zero point five
Cellulose acetate butyrate	CAB	1.17-1.22	-	1.3-1.7	180-230	50-80	zero point five
Fibroepidemin propionate	CP	1.19-1.23	-	one point seven	180-230	50-80	zero point five
Polycarbonate	PC	one point two	-	one point three	280-320	80-100	zero point eight
Polycarbonate GR	PC-GR	one point four two	10-32	one point one	300-330	100-120	0.15-0.55
Polyethylene terephthalate	PET	one point three seven	-	-	260-290	one hundred and forty	1.2-2.0
Polyethylene terephthalate GR	PET-GR	1.5-1.57	20-30	-	260-290	one hundred and forty	1.2-2.0
Polybutylene terephthalic acid	PBT	one point three	-	-	240-260	60-80	1.5-2.5
Polybutylene terephthalic acid GR	PBT-GR	1.52-1.57	30-50	-	250-270	60-80	0.3-1.2
Nylon 6 (Polyamide 6)	PA 6	one point one four	-	one point eight	240-260	70-120	0.5-2.2
Nylon 6-GR	PA 6-GR	1.36-1.65	30-50	1.26-1.7	270-290	70-120	0.3-1
Nylon 66 raw material	PA 66	one point one five	-	one point seven	260-290	70-120	0.5-2.5
Nylon 6/6-GR	PA66-GR	1.20-1.65	30-50	one point four	280-310	70-120	0.5-1.5
Nylon 11 plastic raw material	PA 11	1.03-1.05	-	two point four	210-250	40-80	0.5-1.5
Nylon 12 plastic	PA 12	1.01-1.04	-	one point two	210-250	40-80	0.5-1.5
Polyether alum	PSO	one point three seven	-	-	310-390	100-160	zero point seven
Polysulfide benzene	PPS	one point six four	forty	-	three hundred and seventy	>150	zero point two
Thermoplastic polyimide	PUR	one point two	-	one point eight five	195-230	20-40	zero point nine
Phenolic formaldehyde resin GP	PF	one point four	-	one point three	60-80	170-190	one point two
Melamine formaldehyde GP	MF	one point five	-	one point three	70-80	150-165	1.2-2
Melamine phenol formaldehyde	MPF	one point six	-	one point one	60-80	160-180	0.8-1.8
polyester resin	UP	2.0-2.1	-	zero point nine	40-60	150-170	0.5-0.8
epoxy resin	EP	one point nine	30-80	1.7-1.9	ca.70	160-170	zero point two
Soft PE shrinkage - 2.5% a Pay attention to the different shrinkage rates in the flow direction and transverse direction, and the influence of the process.
B Copolymer

Meaning of shrinkage

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1, [contract; shrink]: smaller, shorter, or reduce 。 Metal When cooled, the volume shrinks.

2, [draw back]: Make dispersed Of Gather ； tighten. Shrink business outlets.

3. [Contract forces]

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